1. A method for preparing a material with the function of releasing negative ions is characterized by comprising the following steps:

the preparation method of the iron disulfide-silver chloride dispersion comprises the following steps: dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion;

preparing a negative ion powder compound dispersion liquid: dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid;

uniformly mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution under the stirring condition, and continuously stirring for 30-60 min after the sodium borohydride solution is added; and then standing for 1-3 h, and separating a solid product to obtain the material with the negative ion releasing effect.

2. The method for preparing a material with an anion releasing effect according to claim 1, wherein in the step of preparing the iron disulfide-silver chloride dispersion, the ratio of the amount of iron disulfide to silver chloride to the amount of water is 15-30 g: 3-6 g: 1L;

further preferably, in the step of preparing the iron disulfide-silver chloride dispersion, the usage ratio of the iron disulfide, the silver chloride and the water is 20-25 g: 4-5 g: 1L;

most preferably, in the step of preparing the iron disulfide-silver chloride dispersion, the ratio of the amounts of iron disulfide, silver chloride and water is 25 g: 5 g: 1L of the compound.

3. The method for preparing a material having an effect of releasing negative ions according to claim 1,

in the preparation step of the negative ion powder compound dispersion liquid, the dosage ratio of the negative ion powder compound to water is 100-200 g: 1L;

further preferably, in the preparation step of the negative ion powder composite dispersion liquid, the using amount ratio of the negative ion powder composite to water is 150-200 g: 1L;

most preferably, in the step of preparing the negative ion powder composite dispersion, the ratio of the amount of the negative ion powder composite to water is 170 g: 1L of the compound.

4. The method for preparing a material having an anion releasing effect according to claim 1, wherein the anion powder composite is composed of tourmaline powder, fine stone powder and medical stone powder.

5. The method for preparing the material with the effect of releasing the negative ions according to claim 4, wherein the mass ratio of the tourmaline powder, the selenite powder and the medical stone powder is 3-5: 1-3: 1-3;

further preferably, the mass ratio of the tourmaline powder, the refined tourmaline powder and the medical stone powder is 4-5: 1-2: 1-2;

most preferably, the mass ratio of the tourmaline powder, the refined tourmaline powder and the medical stone powder is 4: 1: 1.

6. the method for preparing a material having an effect of releasing negative ions according to claim 1,

the volume ratio of the iron disulfide-silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1-2: 1-2: 0.1 to 0.5;

most preferably, the volume ratio of the iron disulfide-silver chloride dispersion, the negative ion powder composite dispersion and the sodium borohydride solution is 1: 1: 0.3.

7. the method for preparing the material with the effect of releasing the negative ions according to claim 1, wherein the concentration of the sodium borohydride solution is 15-25 g/L; most preferably, the concentration of the sodium borohydride solution is 20 g/L.

8. The method for preparing a material with the effect of releasing negative ions according to claim 1, wherein the sodium borohydride solution is continuously stirred for 40min after the addition is finished; then standing for 2 h.

9. A material having an effect of releasing negative ions, which is prepared by the preparation method of any one of claims 1 to 9.

10. A material having an effect of releasing negative ions, comprising a solid product produced by the production method according to any one of claims 1 to 9 and a formaldehyde adsorbing material; the mass ratio of the solid product to the formaldehyde adsorbing material is 1-3: 1.

Background

The negative ions specifically refer to air negative (oxygen) ions; the general term for a single gas molecule and hydrogen ion group that actually carry a negative charge; among them, forests and wetlands are important places for generating negative (oxygen) ions in air. With the improvement of living standard of people, the requirement for air in closed environments such as indoor environment and the like is gradually improved; among them, the negative ions in the air are one of the important indicators for measuring the air quality.

Tourmaline, the general term of tourmaline group minerals, because of its unique properties such as piezoelectricity, pyroelectric property, electrical conductivity, far infrared radiation and anion release; currently, tourmaline is often compounded with other materials and used for preparing materials for releasing negative ions. However, the release amount of negative ions in conventional materials releasing negative ions still needs to be further increased.

Disclosure of Invention

In order to overcome at least one technical problem in the prior art, the invention firstly provides a preparation method of a material with the function of releasing negative ions; the material prepared by the method has excellent negative oxygen ion release capacity.

The technical problem to be solved by the invention is realized by the following technical scheme:

a method for preparing a material with the function of releasing negative ions comprises the following steps:

the preparation method of the iron disulfide-silver chloride dispersion comprises the following steps: dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion;

preparing a negative ion powder compound dispersion liquid: dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid;

uniformly mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution under the stirring condition, and continuously stirring for 30-60 min after the sodium borohydride solution is added; and then standing for 1-3 h, and separating a solid product to obtain the material with the negative ion releasing effect.

The inventor surprisingly found in a large number of research processes that: the material with the negative ion releasing function is prepared by mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid and then adding a sodium borohydride solution for reaction, so that the negative ion releasing performance of the conventional negative ion releasing material can be greatly improved, and the material has an excellent negative ion releasing function; experiments show that: the anion releasing effect is far higher than that of the conventional anion powder compound consisting of tourmaline powder, selenite powder and medical stone powder.

The inventor further shows through research that: the material with the negative ion releasing effect, which is prepared by reacting the iron disulfide-silver chloride dispersion liquid with the negative ion powder composite dispersion liquid, has the excellent negative ion releasing effect, and the negative ion releasing effect is far higher than that of the conventional negative ion powder composite consisting of tourmaline powder, selenite powder and medical stone powder. However, the material with the negative ion releasing effect prepared by only reacting the iron disulfide dispersion liquid or the silver chloride dispersion liquid with the negative ion powder compound dispersion liquid has the negative ion releasing effect far smaller than that of the material with the negative ion releasing effect prepared by reacting the iron disulfide-silver chloride dispersion liquid with the negative ion powder compound dispersion liquid; the anion releasing ability of the conventional anion powder compound consisting of tourmaline powder, selenite powder and medical stone powder cannot be greatly improved.

Preferably, in the step of preparing the iron disulfide-silver chloride dispersion, the using amount ratio of the iron disulfide to the silver chloride to the water is 15-30 g: 3-6 g: 1L of the compound.

Further preferably, in the step of preparing the iron disulfide-silver chloride dispersion, the usage ratio of the iron disulfide, the silver chloride and the water is 20-25 g: 4-5 g: 1L of the compound.

Most preferably, in the step of preparing the iron disulfide-silver chloride dispersion, the ratio of the amounts of iron disulfide, silver chloride and water is 25 g: 5 g: 1L of the compound.

Preferably, in the preparation step of the negative ion powder composite dispersion liquid, the using amount ratio of the negative ion powder composite to water is 100-200 g: 1L of the compound.

Further preferably, in the preparation step of the negative ion powder composite dispersion liquid, the using amount ratio of the negative ion powder composite to water is 150-200 g: 1L of the compound.

Most preferably, in the step of preparing the negative ion powder composite dispersion, the ratio of the amount of the negative ion powder composite to water is 170 g: 1L of the compound.

Preferably, the anion powder compound consists of tourmaline powder, refined tourmaline powder and medical stone powder.

Preferably, the mass ratio of the tourmaline powder, the Xuanjing stone powder and the medical stone is 3-5: 1-3: 1 to 3.

Further preferably, the mass ratio of the tourmaline powder, the refined stone powder and the medical stone is 4-5: 1-2: 1 to 2.

Most preferably, the mass ratio of the tourmaline powder, the refined stone powder and the medical stone is 4: 1: 1.

further research by the inventors shows that: the material with the negative ion releasing function is prepared by reacting iron disulfide-silver chloride dispersion liquid with negative ion powder compound dispersion liquid consisting of tourmaline powder, selenite powder and medical stone powder, and the negative ion releasing function of the material is far greater than that of the material with the negative ion releasing function prepared by reacting iron disulfide-silver chloride dispersion liquid with negative ion powder compound dispersion liquid consisting of one or any two of tourmaline powder, selenite powder and medical stone powder. This shows that only the material with the negative ion releasing function prepared by reacting the negative ion powder composite dispersion liquid composed of tourmaline powder, selenite powder and medical stone powder with the iron disulfide-silver chloride dispersion liquid can obtain the excellent negative ion releasing function.

Preferably, the volume ratio of the iron disulfide-silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1-2: 1-2: 0.1 to 0.5.

Most preferably, the volume ratio of the iron disulfide-silver chloride dispersion, the negative ion powder composite dispersion and the sodium borohydride solution is 1: 1: 0.3.

preferably, the concentration of the sodium borohydride solution is 15-25 g/L.

Most preferably, the concentration of the sodium borohydride solution is 20 g/L.

Preferably, after the sodium borohydride solution is added, stirring is continued for 40 min; then standing for 2 h.

The invention also provides a material with the function of releasing negative ions, which is prepared by the preparation method.

The invention also provides another material with the function of releasing negative ions, which comprises a solid product prepared by the preparation method and a formaldehyde adsorbing material; the mass ratio of the solid product to the formaldehyde adsorbing material is 1-3: 1.

the formaldehyde adsorbing material is selected from diatomite and/or activated carbon.

Further preferably, the formaldehyde adsorbing material is prepared by the following method:

(1) adding ferrous acetate, copper acetate, thiourea and an organic solvent into a reaction kettle, reacting for 10-20 hours at 130-180 ℃, and taking a solid product to obtain a composite material;

(2) adding the composite material and the adsorbing material into an organic solvent, stirring for 5-10 h, and taking a solid product to obtain the formaldehyde adsorbing material.

The inventor surprisingly discovers through a great deal of research that the formaldehyde adsorption material is obtained by compounding the adsorption material (diatomite and activated carbon) with the composite material obtained by reacting ferrous acetate, copper acetate and thiourea through the step (2); it has excellent formaldehyde removing effect; the removing effect of the formaldehyde is far higher than that of diatomite and active carbon; significant technological advances have been made.

Here, the inventors need to emphasize whether a formaldehyde adsorbing material having excellent properties can be prepared, and the preparation of the composite material plays a decisive role; the research shows that: the formaldehyde adsorbing material prepared by reacting ferrous acetate, copper acetate and thiourea to prepare a composite material and then compounding the composite material with the adsorbing material has an excellent formaldehyde removing effect; if the composite material is prepared by only reacting ferrous acetate or copper acetate with thiourea and then the composite material is compounded with the adsorbing material, the formaldehyde removing effect of the formaldehyde adsorbing material prepared by the composite material is obviously smaller than that of the formaldehyde adsorbing material prepared by simultaneously reacting ferrous acetate, copper acetate and thiourea to prepare the composite material and then compounding the composite material with the adsorbing material.

Preferably, the dosage ratio of the ferrous acetate, the copper acetate, the thiourea and the organic solvent in the step (1) is 15-20 g: 18-22 g: 13-16 g: 400-600 mL.

Most preferably, the dosage ratio of the ferrous acetate, the copper acetate, the thiourea and the organic solvent in the step (1) is 17 g: 20 g: 15 g: 500 mL.

Preferably, the reaction in step (1) is carried out at 150 ℃ for 12 h.

Preferably, the organic solvent in step (1) is absolute ethanol.

Preferably, the use amount ratio of the composite material, the adsorbing material and the organic solvent in the step (2) is 8-12 g: 100-200 g: 1-2L.

Further preferably, the use amount ratio of the composite material, the adsorbing material and the organic solvent in the step (2) is 8-12 g: 150-180 g: 1-2L.

Most preferably, the using ratio of the composite material, the adsorbing material and the organic solvent in the step (2) is 10 g: 160 g: 1.5L.

Preferably, the adsorbent material is selected from diatomaceous earth and activated carbon.

Most preferably, the adsorbing material consists of diatomite and activated carbon in a mass ratio of 2-4: 1.

The inventor further studies and surprisingly finds that: compounding the composite material with adsorbing materials, namely diatomite and active carbon simultaneously to obtain a formaldehyde adsorbing material; the formaldehyde removing effect of the composite material is obviously better than that of a formaldehyde adsorbing material obtained by only compounding the composite material with adsorbing material diatomite or adsorbing material active carbon. This shows that the composite material obtained by the reaction of ferrous acetate, copper acetate and thiourea does not have an excellent formaldehyde removing effect when being compounded with any adsorbing material, and the formaldehyde adsorbing material obtained by compounding the composite material with diatomite and activated carbon has an excellent formaldehyde removing effect.

The formaldehyde adsorbing material obtained by compounding the composite material with the adsorbing materials of diatomite and active carbon achieves a further unexpected effect of removing formaldehyde.

Preferably, stirring is carried out for 6-8 h in the step (2).

Further preferably, the adsorbing material in the step (2) is treated as follows before adding the organic solvent: soaking the adsorbing material in an aqueous solution containing sodium persulfate and sodium chloride for 8-24 h; taking out after soaking, and roasting at 120-140 ℃ for 1-3 h;

the concentration of the sodium persulfate in the aqueous solution is 50-100 g/L; the concentration of the sodium chloride is 120-160 g/L.

Most preferably, the adsorbing material consists of diatomite and activated carbon in a mass ratio of 2-4: 1.

Further research by the inventor shows that before the organic solvent is added into the adsorbing material, the adsorbing materials of diatomite and activated carbon are firstly put into an aqueous solution containing sodium persulfate and sodium chloride for soaking, and then are calcined; compared with the adsorbing materials of diatomite and active carbon which are not treated in the step, the formaldehyde adsorbing material can further improve the formaldehyde removing capacity of the formaldehyde adsorbing material.

Has the advantages that: the invention provides a brand-new preparation method of a material with the function of releasing negative ions; the method adopts iron disulfide-silver chloride dispersion liquid to react with anion powder compound dispersion liquid consisting of tourmaline powder, selenite powder and medical stone powder for the first time to prepare the material with the effect of releasing anions; experiments show that the material with the function of releasing negative ions, which is prepared by the method, has very excellent negative ion releasing capacity; it can greatly improve the anion release capacity of the conventional anion powder compound consisting of tourmaline powder, selenite powder and medical stone powder; the release amount of negative ions is far higher than that of negative ion powder consisting of tourmaline powder, selenite powder and medical stone powder, and remarkable technical progress is achieved; therefore, the material with the negative ion releasing function can be used as a raw material of building materials for preparing the building materials with the negative ion releasing function. In addition, the material with the negative ion releasing function can be added with a formaldehyde adsorbing material, so that the material with the negative ion releasing function also has formaldehyde adsorbing capacity.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to these examples in any way.

Example 1 preparation of Material having anion releasing action

(1) Dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion; wherein the dosage ratio of the iron disulfide, the silver chloride and the water is 25 g: 5 g: 1L of the compound.

(2) Dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid; wherein the dosage ratio of the negative ion powder compound to the water is 170 g: 1L; the anion powder compound consists of tourmaline powder, basalt powder and medical stone powder; wherein the mass ratio of the tourmaline powder, the refined stone powder and the medical stone powder is 4: 1: 1;

(3) uniformly mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution with the concentration of 20g/L under the stirring condition, and continuously stirring for 40min after the sodium borohydride solution is added; then standing for 2h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the iron disulfide-silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1: 1: 0.3.

the tourmaline powder, the XUANJING powder and Maifanitum powder are powder prepared by grinding tourmaline, XUANJING stone and Maifanitum.

Example 2 preparation of Material having anion releasing action

(1) Dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion; wherein the dosage ratio of the iron disulfide, the silver chloride and the water is 15 g: 6 g: 1L of the compound.

(2) Dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid; wherein the dosage ratio of the negative ion powder compound to water is 100 g: 1L; the anion powder compound consists of tourmaline powder, basalt powder and medical stone powder; wherein the mass ratio of the tourmaline powder, the refined stone powder and the medical stone powder is 3: 3: 1;

(3) uniformly mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution with the concentration of 15g/L under the stirring condition, and continuously stirring for 30min after the sodium borohydride solution is added; then standing for 3h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the iron disulfide-silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1: 1: 0.5.

example 3 preparation of Material having anion releasing action

(1) Dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion; wherein the dosage ratio of the iron disulfide, the silver chloride and the water is 30 g: 3 g: 1L of the compound.

(2) Dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid; wherein the dosage ratio of the negative ion powder compound to water is 200 g: 1L; the anion powder compound consists of tourmaline powder, basalt powder and medical stone powder; wherein the mass ratio of the tourmaline powder, the refined stone powder and the medical stone powder is 5: 1: 3;

(3) uniformly mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution with the concentration of 25g/L under the stirring condition, and continuously stirring for 60min after the sodium borohydride solution is added; then standing for 1h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the iron disulfide-silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1: 1: 0.1.

comparative example 1 preparation of Material having anion releasing action

(1) Dispersing iron disulfide in water to form an iron disulfide dispersion; wherein the dosage ratio of the iron disulfide to the water is 30 g: 1L of the compound.

(2) Dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid; wherein the dosage ratio of the negative ion powder compound to the water is 170 g: 1L; the anion powder compound consists of tourmaline powder, basalt powder and medical stone powder; wherein the mass ratio of the tourmaline powder, the refined stone powder and the medical stone powder is 4: 1: 1;

(3) uniformly mixing the iron disulfide dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution with the concentration of 20g/L under the stirring condition, and continuing stirring for 40min after the sodium borohydride solution is added; then standing for 2h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the iron disulfide dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1: 1: 0.3.

comparative example 1 differs from example 1 in that the composition of the metal compound dispersion is different: example 1 a material having an anion releasing effect was prepared by reacting an iron disulfide-silver chloride dispersion with an anion powder composite dispersion; and comparative example 1 is only to prepare a material having an anion releasing effect from the iron disulfide dispersion and the negative ion powder composite dispersion.

Comparative example 2 preparation of Material having anion releasing action

(1) Dispersing silver chloride in water to form a silver chloride dispersion; wherein the dosage ratio of the silver chloride to the water is 30 g: 1L of the compound.

(2) Dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid; wherein the dosage ratio of the negative ion powder compound to the water is 170 g: 1L; the anion powder compound consists of tourmaline powder, basalt powder and medical stone powder; wherein the mass ratio of the tourmaline powder, the refined stone powder and the medical stone powder is 4: 1: 1;

(3) uniformly mixing the silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution with the concentration of 20g/L under the stirring condition, and continuously stirring for 40min after the sodium borohydride solution is added; then standing for 2h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1: 1: 0.3.

comparative example 2 differs from example 1 in that the composition of the metal compound dispersion is different: example 1 a material having an anion releasing effect was prepared by reacting an iron disulfide-silver chloride dispersion with an anion powder composite dispersion; and comparative example 2 was just to prepare a material having an anion releasing effect from a dispersion of a complex of silver chloride and anion powder.

Comparative example 3 preparation of Material having anion releasing action

(1) Dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion; wherein the dosage ratio of the iron disulfide, the silver chloride and the water is 25 g: 5 g: 1L of the compound.

(2) Dispersing tourmaline powder in water to form tourmaline powder dispersion liquid; wherein the dosage ratio of the tourmaline powder to the water is 170 g: 1L;

(3) uniformly mixing the iron disulfide-silver chloride dispersion liquid and the tourmaline powder dispersion liquid, adding a sodium borohydride solution with the concentration of 20g/L under the stirring condition, and continuing stirring for 40min after the sodium borohydride solution is added; then standing for 2h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the iron disulfide-silver chloride dispersion liquid to the tourmaline powder dispersion liquid to the sodium borohydride solution is 1: 1: 0.3.

comparative example 3 differs from example 1 in the composition of the negative ion powder composite: example 1 a material having an effect of releasing negative ions was prepared by reacting an iron disulfide-silver chloride dispersion with a negative ion powder composite dispersion composed of tourmaline powder, selenite powder, and medical stone powder; and the comparative example 3 is only to prepare the material with the function of releasing negative ions by the reaction of the iron disulfide-silver chloride dispersion and the tourmaline powder dispersion.

Comparative example 4 preparation of Material having anion releasing action

(1) Dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion; wherein the dosage ratio of the iron disulfide, the silver chloride and the water is 25 g: 5 g: 1L of the compound.

(2) Dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid; wherein the dosage ratio of the negative ion powder compound to the water is 170 g: 1L; the anion powder compound consists of tourmaline powder and selenite powder; wherein the mass ratio of the tourmaline powder to the Xuanjing powder is 4: 2;

(3) uniformly mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution with the concentration of 20g/L under the stirring condition, and continuously stirring for 40min after the sodium borohydride solution is added; then standing for 2h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the iron disulfide-silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1: 1: 0.3.

comparative example 4 differs from example 1 in the composition of the negative ion powder composite: example 1 a material having an effect of releasing negative ions was prepared by reacting an iron disulfide-silver chloride dispersion with a negative ion powder composite dispersion composed of tourmaline powder, selenite powder, and medical stone powder; and comparative example 4 is only a material having an anion releasing effect prepared by reacting an iron disulfide-silver chloride dispersion with an anion powder composite dispersion composed of tourmaline powder and spermite powder.

Comparative example 5 preparation of Material having anion releasing action

(1) Dispersing iron disulfide and silver chloride in water to form an iron disulfide-silver chloride dispersion; wherein the dosage ratio of the iron disulfide, the silver chloride and the water is 25 g: 5 g: 1L of the compound.

(2) Dispersing the negative ion powder compound in water to form a negative ion powder compound dispersion liquid; wherein the dosage ratio of the negative ion powder compound to the water is 170 g: 1L; the anion powder compound consists of tourmaline powder and medical stone powder; wherein the mass ratio of the tourmaline powder to the medical stone powder is 4: 2;

(3) uniformly mixing the iron disulfide-silver chloride dispersion liquid and the negative ion powder compound dispersion liquid, adding a sodium borohydride solution with the concentration of 20g/L under the stirring condition, and continuously stirring for 40min after the sodium borohydride solution is added; then standing for 2h, and separating a solid product to obtain the material with the function of releasing negative ions; wherein the volume ratio of the iron disulfide-silver chloride dispersion liquid to the negative ion powder compound dispersion liquid to the sodium borohydride solution is 1: 1: 0.3.

comparative example 5 differs from example 1 in the composition of the negative ion powder composite: example 1 a material having an effect of releasing negative ions was prepared by reacting an iron disulfide-silver chloride dispersion with a negative ion powder composite dispersion composed of tourmaline powder, selenite powder, and medical stone powder; and comparative example 5 is only a material having an effect of releasing negative ions prepared by reacting an iron disulfide-silver chloride dispersion with a negative ion powder composite dispersion composed of tourmaline powder and medical stone powder.

Experimental example 1

Manufacturing a sealable glass box with a vent pipe and an exhaust pipe, wherein the length, the width and the height of the glass box are respectively 0.5 m; 100g of a material to be tested with the negative ion releasing effect is paved at the bottom of the glass box; meanwhile, a negative ion concentration tester is arranged at the bottom of the glass box and used for testing the content of negative ions in the glass box; recording the content of negative ions in the experimental glass box of each group of test materials after 3 h; each material was tested 5 times and the results averaged over 5 times and are shown in table 1.

Meanwhile, 100g of the anion powder composite (composed of tourmaline powder, selenite powder and medical stone powder in a mass ratio of 4: 1: 1) adopted in the above examples was taken as a control.

TABLE 1 test results of anion releasing ability of material having anion releasing action

Test material	Content of negative ions
		Tourmaline powder: the selenitum powder: medical stone powder is 4: 1: 1	828 pieces/cm3
Example 1 preparation ofMaterial with negative ion releasing function	4892 pieces/cm3
		Example 2 Material having anion releasing action	4638 pieces/cm3
Example 3 Material having anion releasing action	4315 pieces/cm3
		Comparative example 1 material having anion releasing effect	1571 pieces/cm3
Comparative example 2 material having anion releasing effect	1738 pieces/cm3
		Comparative example 3 material having anion releasing action	2045 pieces/cm3
Comparative example 4 negative ion releasing Material	2545 pieces/cm3
		Comparative example 5 negative ion releasing Material	2733/cm3

As can be seen from the results of the anion release capability test in Table 1, the anion content of the material with the anion release effect obtained in examples 1 to 3 reaches 4638 pieces/cm³Above 828 anion powder/cm far higher than that of conventional anion powder compound composed of tourmaline powder, XUANJING powder and Maifanitum powder³(ii) a This indicates that: the material with the negative ion releasing effect is prepared by reacting the iron disulfide-silver chloride dispersion liquid with the negative ion powder composite dispersion liquid, can greatly improve the negative ion releasing performance of a conventional negative ion powder composite consisting of tourmaline powder, selenite powder and medical stone powder, and has an excellent negative ion releasing effect.

As can be seen from the results of the anion release capacity test in Table 1, the anion content of the material with the anion release function prepared in example 1 is far higher than that of the material with the anion release function prepared in comparative examples 1-2; this indicates that: the material with the negative ion releasing function is prepared by the reaction of iron disulfide-silver chloride dispersion and negative ion powder compound dispersion, and the negative ion releasing function of the material is far greater than that of the material with the negative ion releasing function prepared by the reaction of only iron disulfide dispersion or silver chloride dispersion and negative ion powder compound dispersion; the material with the negative ion releasing effect, which is prepared by reacting the iron disulfide-silver chloride dispersion liquid with the negative ion powder composite dispersion liquid, has the excellent negative ion releasing effect, and the negative ion releasing effect is far higher than that of the conventional negative ion powder composite consisting of tourmaline powder, selenite powder and medical stone powder.

As can be seen from the results of the anion release capacity test in Table 1, the anion content of the material with the anion release function prepared in example 1 is far higher than that of the material with the anion release function prepared in comparative examples 3-5; this indicates that: the material with the negative ion releasing function is prepared by reacting iron disulfide-silver chloride dispersion liquid with negative ion powder compound dispersion liquid consisting of tourmaline powder, selenite powder and medical stone powder, and the negative ion releasing function of the material is far greater than that of the material with the negative ion releasing function prepared by reacting iron disulfide-silver chloride dispersion liquid with negative ion powder compound dispersion liquid consisting of one or any two of tourmaline powder, selenite powder and medical stone powder. This shows that only the material with the negative ion releasing function prepared by reacting the negative ion powder composite dispersion liquid composed of tourmaline powder, selenite powder and medical stone powder with the iron disulfide-silver chloride dispersion liquid can obtain the excellent negative ion releasing function.

Example 4 preparation of Material having anion releasing action

Uniformly mixing the solid product prepared in the step (3) in the embodiment 1 with a formaldehyde adsorbing material to obtain the material with the negative ion releasing effect;

wherein the mass ratio of the solid product to the formaldehyde adsorbing material is 3: 1; the formaldehyde adsorbing material is prepared from the following components in percentage by mass of 3: 1 and activated carbon.

Example 5 preparation of Material having anion releasing action

Uniformly mixing the solid product prepared in the step (3) in the embodiment 1 with a formaldehyde adsorbing material to obtain the material with the negative ion releasing effect;

wherein the mass ratio of the solid product to the formaldehyde adsorbing material is 3: 1;

the formaldehyde adsorbing material is prepared by the following method: (1) adding ferrous acetate, copper acetate, thiourea and absolute ethyl alcohol into a reaction kettle, reacting for 12 hours at 150 ℃, removing the absolute ethyl alcohol, and taking a solid product to obtain a composite material; (2) adding the composite material, diatomite and active carbon into absolute ethyl alcohol, stirring for 8 hours, removing the absolute ethyl alcohol, and taking a solid product to obtain the formaldehyde adsorbing material;

in the step (1), the dosage ratio of the ferrous acetate, the copper acetate, the thiourea and the absolute ethyl alcohol is 17 g: 20 g: 15 g: 500 mL; in the step (2), the dosage ratio of the composite material, the diatomite, the activated carbon and the absolute ethyl alcohol is 10 g: 120 g: 40 g: 1.5L.

Example 6 preparation of Material having anion releasing action

Uniformly mixing the solid product prepared in the step (3) in the embodiment 1 with a formaldehyde adsorbing material to obtain the material with the negative ion releasing effect;

wherein the mass ratio of the solid product to the formaldehyde adsorbing material is 3: 1;

the formaldehyde adsorbing material is prepared by the following method: (1) adding ferrous acetate, copper acetate, thiourea and absolute ethyl alcohol into a reaction kettle, reacting for 12 hours at 150 ℃, removing the absolute ethyl alcohol, and taking a solid product to obtain a composite material; (2) adding the composite material, diatomite and active carbon into absolute ethyl alcohol, stirring for 8 hours, removing the absolute ethyl alcohol, and taking a solid product to obtain the formaldehyde adsorbing material;

the diatomite and the activated carbon are treated as follows before being added into the absolute ethyl alcohol: soaking diatomite and active carbon in an aqueous solution containing 60g/L of sodium persulfate and 140g/L of sodium chloride for 12 hours; taking out after soaking, and roasting for 2h at 130 ℃;

in the step (1), the dosage ratio of the ferrous acetate, the copper acetate, the thiourea and the absolute ethyl alcohol is 17 g: 20 g: 15 g: 500 mL; in the step (2), the dosage ratio of the composite material, the diatomite, the activated carbon and the absolute ethyl alcohol is 10 g: 120 g: 40 g: 1.5L.

Experimental example 2

Manufacturing a sealable glass box with a vent pipe and an exhaust pipe, wherein the length, the width and the height of the glass box are respectively 0.5 m; 100g of a material to be tested with the negative ion releasing effect is paved at the bottom of the glass box; meanwhile, a formaldehyde tester is arranged at the bottom of the glass box and used for testing the formaldehyde concentration in the glass box; then formaldehyde generated by the formaldehyde generator is introduced into the glass box through a vent pipe of the glass box, so that the initial formaldehyde concentration in the glass box is 1.0mg/m³The glass box is sealed; recording the concentration of formaldehyde in the experimental glass box of each group of test materials after 12 h; each material was tested 5 times and the results averaged over 5 times and are shown in table 2.

The material with the negative ion releasing effect to be tested is the material with the negative ion releasing effect prepared in the embodiments 4-6.

TABLE 2 Formaldehyde removal Effect of materials having anion releasing action

	Content of Formaldehyde
		Example 4 Material having anion releasing action	0.55mg/m3
Example 5 preparation of the Material having anion Release	0.11mg/m3
		Example 6 negative ion releasing Material	0.03mg/m3

As can be seen from the formaldehyde test experimental data in table 2, the formaldehyde adsorbing material composed of diatomite and activated carbon is added to the material with the negative ion releasing effect described in example 4, so that the material with the negative ion releasing effect also has a certain formaldehyde removing capability.

As can be seen from the data of the formaldehyde test experiment in Table 2, the material with the function of releasing negative ions in example 5 has much higher formaldehyde removal capacity than that of example 4; the result shows that the diatomite and the activated carbon are compounded with the composite material obtained by the reaction of the ferrous acetate, the copper acetate and the thiourea and then added into the material with the effect of releasing the negative ions, so that the formaldehyde removal capability of the material with the effect of releasing the negative ions can be greatly improved.

As can be seen from the data of the formaldehyde test experiment in Table 2, the material with the function of releasing negative ions in example 6 has much higher formaldehyde removal capacity than that of examples 4 and 5; this indicates that: the diatomite and the active carbon are pretreated by the method of the invention (namely, the diatomite and the active carbon which are used as adsorbing materials are firstly soaked in an aqueous solution containing sodium persulfate and sodium chloride, and then are calcined); then the composite material is compounded with a composite material obtained by the reaction of ferrous acetate, copper acetate and thiourea and then added into the material with the function of releasing negative ions, so that the formaldehyde removal capability of the material with the function of releasing negative ions can be further greatly improved.