1. The inorganic interior wall fireproof coating is characterized by comprising the following raw materials in parts by weight:

wherein the modified potassium silicate is synthesized by potassium carbonate and silicon dioxide through a high-temperature melting method, and the modulus is 3.5-4.0;

wherein the modulus of the silica sol is greater than 50;

wherein the lowest film-forming temperature of the pure acrylic emulsion is 5 ℃;

wherein the filler is a mixture of wollastonite, calcined kaolin and 1200-1300-mesh coarse whiting, and the content of calcium and magnesium ions is less than 0.01 percent;

wherein the main component of the stabilizer is quaternary ammonium salt.

2. The inorganic interior wall fireproof coating of claim 1, wherein the inorganic interior wall fireproof coating comprises the following raw materials in parts by weight:

3. the inorganic interior wall fireproof coating of claim 1, wherein the inorganic interior wall fireproof coating further comprises the following raw materials in weight percentage:

4. the inorganic interior wall fireproof coating of claim 2, wherein the inorganic interior wall fireproof coating further comprises the following raw materials in weight percentage:

5. a preparation method of an inorganic interior wall fireproof coating is characterized by comprising the following steps:

step 1, adding hydroxyethyl cellulose into water, dispersing, adding a dispersing agent, a wetting agent, a stabilizing agent and a part of defoaming agent, stirring, adding titanium dioxide and a filler, dispersing at a high speed, sampling, and measuring fineness by a scraper;

and 2, after the fineness is detected to be qualified, adding the pure acrylic emulsion, 1/3 potassium silicate and 1/3 silica sol solution into the material obtained in the step 1, adjusting the pH, adding the rest potassium silicate and silica sol solution and the rest defoaming agent, and stirring to obtain the inorganic interior wall fireproof coating.

Wherein the modified potassium silicate is synthesized by potassium carbonate and silicon dioxide through a high-temperature melting method, and the modulus is 3.5-4.0;

wherein the modulus of the silica sol is greater than 50;

wherein the lowest film-forming temperature of the pure acrylic emulsion is 5 ℃;

wherein the filler is a mixture of wollastonite, calcined kaolin and 1200-1300-mesh coarse whiting, and the content of calcium and magnesium ions is less than 0.01 percent;

wherein the main component of the stabilizer is quaternary ammonium salt.

6. The method for preparing the inorganic interior wall fireproof coating according to claim 5, wherein in step 1, the fineness is 50um or less.

7. The method for preparing the inorganic interior wall fireproof coating according to claim 5, wherein in the step 2, the pH is adjusted to be more than or equal to 10.5.

Background

Nowadays, people have higher and higher requirements on living environment, and the 'green' and 'environmental protection' are new requirements put forward by people for the paint industry after the people pay high attention to ecological environment protection, and are also new directions for paint development. And meanwhile, the 'interior decoration design fire protection code of building' is specified in the plaintext: industrial and civil buildings should use non-combustible materials and flame-retardant materials to avoid the use of materials that produce a large amount of smoke or toxic gases during combustion. A-grade decoration materials are adopted for wall surfaces and ground surfaces in buildings in public areas. The inorganic mineral interior wall coating takes natural minerals as raw materials, completely accords with the regulation of 'fire protection code for interior decoration design of buildings', has good flame retardancy or incombustibility, can effectively prevent the occurrence and expansion of fire, and ensures that buildings are safer.

Inorganic paint, as an ecological environment-friendly paint in the current paint field, has been developed for hundreds of years and has grown into a paint which is dominant in the paint market of developed countries in Europe and America. The inorganic coating uses water as a dispersion medium, so that the pollution of a solvent in the coating industry to the environment is fundamentally solved, but the inorganic coating on the market at present has the problems of poor stability and scrubbing resistance, serious post thickening, high VOC content and the like, and even has counterfeit and shoddy products, and the fire-proof grade cannot reach A grade.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an inorganic interior wall fireproof coating; through silica sol and potassium silicate with special modulus, emulsion formed at low temperature and stabilizer of quaternary ammonium salt, the heavy metal content of the filler is controlled, and finally the inorganic interior wall fireproof paint which has excellent stability, no thickening after 30 days of thermal storage, 0VOC, over 15000 times of scrubbing resistance, fire resistance of A2 level and easy construction is prepared.

The invention aims to provide an inorganic interior wall fireproof coating which comprises the following raw materials in parts by weight:

wherein the modified potassium silicate is synthesized by potassium carbonate and silicon dioxide through a high-temperature melting method, and the modulus is 3.5-4.0;

wherein the modulus of the silica sol is greater than 50;

wherein the lowest film-forming temperature of the pure acrylic emulsion is 5 ℃;

wherein the filler is a mixture of calcined kaolin and 1250-mesh heavy calcium powder, and the content of calcium and magnesium ions is less than 0.01 percent;

wherein the main component of the stabilizer is quaternary ammonium salt.

Preferably, the inorganic interior wall fireproof coating comprises the following raw materials in percentage by weight:

further, the inorganic interior wall fireproof coating also comprises the following raw materials in parts by weight:

preferably, the inorganic interior wall fireproof coating also comprises the following raw materials in percentage by weight:

further, the modified potassium silicate is selected from one of K99A in Australian chemical industry, K100 in Australian chemical industry and WJ-666 in lotus leaf chemical industry.

Further, the silica sol is selected from one of Australian chemical S308 and Noron CC 301.

Further, the pure acrylic emulsion is selected from one of Badfu RS-837 and Rossff-5588.

Further, the calcined kaolin is selected from the group consisting of gold calcined kaolin.

Further, the heavy calcium powder is selected from 1250-mesh heavy calcium powder produced by Jiangxi Guangxi.

Further, the wollastonite is selected from Jiangxi euryale 2000-mesh wollastonite.

Further, the stabilizer is selected from one of Craine SPS and Australian chemical AR-CS 1.

Further, the rutile type titanium dioxide is selected from BlR-698 or R-996 of Bailey Union of python.

Further, the molecular weight of the hydroxyethyl cellulose is 20000-40000 and is selected from the group consisting of ashland 250 HBR.

Further, the wetting agent is selected from LCN407 of clariant.

Furthermore, the main component of the dispersant is a hydrophobically modified sodium salt selected from one of Pasteur CX4320, Nopulidae 5040 and Dow quick.

Further, the antifoaming agent is selected from basfA10。

The invention also aims to provide a preparation method of the inorganic interior wall fireproof coating, which comprises the following steps:

step 1, adding hydroxyethyl cellulose into water, dispersing, adding a dispersing agent, a wetting agent, a stabilizing agent and a part of defoaming agent, stirring, adding titanium dioxide and a filler, dispersing at a high speed, sampling, and measuring fineness by a scraper;

and 2, after the fineness is detected to be qualified, adding the pure acrylic emulsion, 1/3 potassium silicate and 1/3 silica sol solution into the material obtained in the step 1, adjusting the pH, adding the rest potassium silicate and silica sol solution and the rest defoaming agent, and stirring to obtain the inorganic interior wall fireproof coating.

Wherein the modified potassium silicate is synthesized by potassium carbonate and silicon dioxide through a high-temperature melting method, and the modulus is 3.5-4.0;

wherein the modulus of the silica sol is greater than 50;

wherein the lowest film-forming temperature of the pure acrylic emulsion is 5 ℃;

wherein the filler is a mixture of wollastonite, calcined kaolin and 1200-1300-mesh coarse whiting, and the content of calcium and magnesium ions is less than 0.01 percent;

wherein the main component of the stabilizer is quaternary ammonium salt.

Further, in step 1, the fineness is below 50 um.

Further, in step 2, the pH is adjusted to a pH of not less than 10.5.

Compared with the prior art, the invention has the following beneficial effects:

(1) the inorganic interior wall fireproof coating prepared by the invention adopts high-modulus modified potassium silicate as a raw material, the high-modulus modified potassium silicate has multiple active hydroxyl groups and multiple bonding groups with a base material, the high-modulus modified potassium silicate permeates capillary pores in a cement base material through the petrochemical action to enhance the adhesive force with the cement base material, and can form an insoluble calcium silicate inorganic hard coating film with the surface of concrete, and the coating film has super washing resistance, air permeability and water and mildew resistance, so that a lasting protection effect is provided for a wall surface.

(2) The modulus of the potassium silicate is further improved by adding the high-modulus silica sol, so that the potassium silicate has higher reaction activity, the addition of the quaternary ammonium salt is favorable for the stability of the high-activity potassium silicate, the potassium silicate is prevented from being gelled due to condensation polymerization, meanwhile, the potassium silicate is modified by using the silicon dioxide, the stability of the modified potassium silicate is improved, and the heavy metal content of the filler is controlled by matching with the emulsion formed by low-temperature film formation, so that the inorganic interior wall fireproof coating which is excellent in stability, free from post-thickening after 30-day thermal storage, 0VOC (volatile organic compound), resistant to scrubbing for more than 15000 times, fireproof in A2 level, nontoxic and easy to construct is finally prepared.

Drawings

FIG. 1 is a cross-sectional view of the inorganic fire and latex paint prepared in example 1.

FIG. 2 is a surface SEM of a coating film formed of the inorganic interior wall fire retardant coating prepared in example 1 and a coating film formed of a latex paint.

FIG. 3 is a comparison chart of the inorganic interior wall fireproofing coating prepared in example 1 before and after SBI experiment.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings and the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples 1 to 5: preparing inorganic fireproof paint for inner wall.

(1) Compositions of inorganic interior wall fireproofing of examples 1-5.

TABLE 1 composition by weight of the inorganic interior wall fireproofing coating of examples 1-5.

(2) Examples 1-5 preparation of inorganic interior wall fire-retardant coating.

Step 1, mixing Askalimena 250HBR is added to water, the speed is adjusted to 500rpm/min, and dispersed for 5min until the Ashland 250HBR is fully swollen with no obvious particles. Then add Pasteur CX4320, Craine LCN407, Craine SPS and 1/3 Pasteur in sequenceStirring for 5min, and dispersing uniformly. And then regulating the rotation speed to 1200rpm/min, sequentially adding BLR-698, Jiangxi generalized industrial 2000-mesh wollastonite of the Jinyu calcined kaolin and 1250-mesh heavy calcium powder, after the addition is finished, regulating the rotation speed to 1500rpm/min, dispersing at a high speed for 20min, sampling, and measuring the fineness by a scraper, wherein the fineness is less than or equal to 50 um.

Step 2, after the fineness is detected to be qualified, regulating the rotation speed to 500rpm/min, adding the Badfei RS-837 on the basis of the step 1, then adding 1/3 Australian chemical K99A and 1/3 Australian chemical S308 solution, adding the rest 2/3 Australian chemical K99A and 2/3 Australian chemical S308 solution after the pH value is more than or equal to 10.5, and finally adding the rest 2/3 Basofu chemicalStirring for 5min to obtain the inorganic fireproof paint for the inner wall.

And (5) testing the performance.

The prepared inorganic interior wall fireproof coating is coated to the thickness of 1-2mm and cured to obtain a coating film prepared in the embodiment 1-5, and the combustion performance test is carried out according to the GB 9624-.

TABLE 2 test results of the performance of the coating films obtained in examples 1 to 5.

As can be seen from table 2, the coating films prepared from the inorganic interior wall fireproof coatings prepared in examples 1 to 5 have the advantages of excellent scrubbing resistance, low VOC, good thermal storage stability, no post-thickening, excellent fireproof performance, and the like, and the inorganic interior wall fireproof coating prepared in example 5 has the best comprehensive effect.

Comparative example 1

The modified potassium silicate in example 3 is replaced by unmodified potassium silicate with the modulus of 3, the silica sol is replaced by silica sol with the modulus of 40, the pure acrylic emulsion is replaced by pure acrylic emulsion with the film forming temperature of 10 ℃, the filler is replaced by ground calcium carbonate, and the rest preparation steps are unchanged.

And (5) testing the performance.

The coating prepared in comparative example 1 was applied to a thickness of 1-2mm and cured, and the burning performance test was performed according to the standard method of GB 9624-.

TABLE 3 test results of the performance of the coating films obtained in examples 1 to 5.

The results of comparing the inorganic interior wall fire-retardant coatings prepared in examples 1 to 5 of the present invention with the conventional latex paints are shown in Table 4.

Table 4 compares the performance of the inorganic interior wall fire-retardant coating prepared by the invention with that of the existing emulsion paint.

As can be seen from Table 4 and FIG. 1, by comparing the inorganic fireproof coating for interior walls prepared by the present invention with the existing latex paint, it can be seen that the existing latex paint can penetrate into the substrate shallowly, while the inorganic fireproof coating for interior walls prepared by the present invention can penetrate into the substrate more than 5cm deep, and the obtained inorganic fireproof coating for interior walls has the performance of super scrubbing resistance and low VOC.

Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the modifications and equivalents of the specific embodiments of the present invention can be made by those skilled in the art after reading the present specification, but these modifications and variations do not depart from the scope of the claims of the present application.