1. A method for improving the color difference of artificial marble, comprising the steps of:

(1) taking the weight percentage as a unit, putting 60-75% of calcium carbonate powder, 0.01-1.53% of auxiliary agent, 1-2% of kaolin and 10-16% of inorganic binder into a stirrer for fully stirring, and stirring for 15-20min at the stirring frequency of 30-50Hz and the speed of 40-300r/min to prepare a mixture a;

(2) adding 5-7 wt% of water into the mixture a prepared in the step (1) to be stirred and mixed to prepare a mixture b;

(3) putting the mixture b prepared in the step (2) into a material distributor;

(4) and (3) uniformly distributing the mixture b in a mold by using a distributing machine, performing vacuum pumping on the mixture b by using a press, and performing press forming to obtain an artificial stone product, wherein the vacuum degree is more than 0.095Mpa, so that the artificial marble color difference is improved.

2. The method for improving color difference of artificial marble according to claim 1, wherein the aid in step (1) comprises one or more of aid a, aid b and aid c.

3. The method for improving color difference of artificial marble as set forth in claim 2, wherein the aid a is 4, 4-diaminostilbene-2, 2-disulfonic acid.

4. The method for improving color difference of artificial marble according to claim 3, wherein said 4, 4-diaminostilbene-2, 2-disulfonic acid is added in an amount of 0.01 to 0.03% by weight.

5. The method for improving color difference of artificial marble as claimed in claim 2, wherein said auxiliary agent b comprises one or more of lignosulfonate water-reducing agent, polycyclic aromatic salt water-reducing agent, and water-soluble resin sulfonate water-reducing agent.

6. The method for improving color difference of artificial marble as set forth in claim 5, wherein the additive b is added in an amount of 0.1-0.7% by weight.

7. The method for improving color difference of artificial marble according to claim 2, wherein said adjuvant c is a light stabilizer consisting of a linear hydroxypiperidinol and a linear dibasic acid ester, and is added in an amount of 0.1-0.8%.

8. The method for improving color difference of artificial marble according to claim 1, wherein said inorganic binder is high alumina cement.

9. The method for improving color difference of artificial marble as set forth in claim 1, wherein the temperature of the mixer in step (1) is 25 ℃.

10. The method for improving color difference of artificial marble according to claim 1, wherein the temperature of water in step (2) is 25 ℃.

[ background of the invention ]

The artificial granite is also called synthetic stone, reconstructed stone and engineering stone. It is made up by using natural marble and stone powder as main raw material, adding glass material as decorative material, using organic resin or cement as adhesive, vacuum stirring, high-pressure vibration forming and room-temp. curing.

The artificial granite products are applied to places of hotels, subways, markets and homes, and are easy to have yellowing and reddening phenomena along with the time lapse, because the same batch of materials are applied to the artificial granite in the production process, different color differences appear on the produced granite, and because the artificial stone is not carefully selected, planned with materials and subjected to color separation like natural marble in the manufacturing process, the influence of the color differences of the artificial stone on production and processing is neglected, so that the color differences among the products are found after the produced products are processed, the products are scrapped and reprocessed, the production time is wasted, the production cost of the products is increased, the loss is caused, the on-schedule completion and operation of projects are influenced, and serious adverse effects are caused to enterprises.

[ summary of the invention ]

The invention mainly solves the technical problem of how to improve chromatic aberration, and provides a more effective method for improving chromatic aberration on the premise of not influencing the performance of the chromatic aberration.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

a method for improving the color difference of artificial marble comprising the steps of:

(1) taking the weight percentage as a unit, putting 60-75% of calcium carbonate powder, 0.01-1.53% of auxiliary agent, 1-2% of kaolin and 10-16% of inorganic binder into a stirrer for fully stirring, and stirring for 15-20min at the stirring frequency of 30-50Hz and the speed of 40-300r/min to prepare a mixture a;

(2) adding 5-7 wt% of water into the mixture a prepared in the step (1) to be stirred and mixed to prepare a mixture b;

(3) putting the mixture b prepared in the step (2) into a material distributor;

(4) and (3) uniformly distributing the mixture b in a mold by using a distributing machine, performing vacuum pumping on the mixture b by using a press, and performing press forming to obtain an artificial stone product, wherein the vacuum degree is more than 0.095Mpa, so that the artificial marble color difference is improved.

Further, the auxiliary agent in the step (1) comprises one or more of an auxiliary agent a, an auxiliary agent b and an auxiliary agent c.

Further, the additive a is 4, 4-diaminostilbene-2, 2-disulfonic acid.

Furthermore, the 4, 4-diaminostilbene-2, 2-disulfonic acid is added in an amount of 0.01 to 0.03 percent by weight.

Further, the auxiliary agent b comprises one or more of lignosulfonate water reducing agents, polycyclic aromatic salt water reducing agents and water-soluble resin sulfonate water reducing agents.

Furthermore, the addition amount of the auxiliary agent b is 0.1-0.7% by weight percentage.

Further, the auxiliary agent c is a light stabilizer and consists of linear hydroxypiperidinol and linear dibasic acid ester, and the addition amount is 0.1-0.8%.

Further, the inorganic binder is high alumina cement.

Further, the temperature of the stirrer in the step (1) was 25 ℃.

Further, the temperature of the water in the step (2) is 25 ℃.

The invention has the following beneficial effects:

(1) the additive a is 4, 4-diaminostilbene-2, 2-disulfonic acid, has the effect of improving chromatic aberration, and can solve the phenomena of yellowing and reddening of the artificial stone product; the auxiliary agent b is a polycyclic aromatic salt water reducing agent, and the use amounts of water, inorganic binder, the auxiliary agent a and the auxiliary agent c are reduced; the assistant c is a light stabilizer and consists of straight-chain hydroxypiperidinol and straight-chain dibasic acid ester, plays a role in stabilizing the color of the artificial stone product, and synergistically reduces the red value and the yellow value of the artificial stone product under the mutual cooperation of the assistant a, the assistant b and the assistant c.

(2) The artificial stone product prepared by the method has the compression strength of more than 93.6MPa and more than 87.2 percent higher than the standard compression strength of the artificial marble, the bending strength of more than 12.8MPa and more than 28 percent higher than the standard compression strength of the artificial marble, and the fire-proof grade of A, which is the same as the standard fire-proof grade of the artificial marble, so that the artificial stone product prepared by the method has excellent performance, is obviously better than the standard of the artificial marble, and has remarkable progress.

(3) The yellow value and the red value of the artificial stone product are basically unchanged after the artificial stone product is placed in an ultraviolet aging box for 500 days, which shows that the artificial stone product has high combination firmness and strong light resistance.

(4) At present, the problem of chromatic aberration of artificial granite is generally solved by repeatedly debugging according to the experience of workers, so that the chromatic aberration is improved. The invention is carried out under the same condition of production environment, and then the additive a, the additive b and the additive c are added, and under the synergistic cooperation of the additive a, the additive b and the additive c, the additives can be stably combined with calcium carbonate powder and the like, so that the effect of improving color difference is achieved. The method can reduce the difference between color differences, improve the product development efficiency and improve the quality.

[ detailed description ] embodiments

In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.

The method for improving the color difference of the artificial marble comprises the following steps:

(1) taking the weight percentage as a unit, putting 60-75% of calcium carbonate powder, 0.01-1.53% of auxiliary agent, 1-2% of kaolin and 10-16% of inorganic binder into a constant-temperature stirrer for fully stirring, wherein the temperature of the constant-temperature stirrer is 25 ℃, and the stirring frequency is 30-50Hz, and the speed is 40-300r/min, and stirring for 15-20min to prepare a mixture a; the auxiliary agent comprises one or more of an auxiliary agent a, an auxiliary agent b and an auxiliary agent c; the additive a is 4, 4-diaminostilbene-2, 2-disulfonic acid, and the addition amount is 0.01-0.03%;

the auxiliary agent b comprises one or more of lignosulfonate water reducing agent, polycyclic aromatic salt water reducing agent and water-soluble resin sulfonate water reducing agent, and the addition amount is 0.1-0.7%;

the assistant c is a light stabilizer and consists of linear hydroxypiperidinol and linear dibasic acid ester, and the addition amount is 0.1-0.8%;

the inorganic binder is high-alumina cement;

(2) adding 5-7 wt% of thermostatic water into the mixture a prepared in the step (1) to be stirred and mixed to prepare a mixture b, wherein the temperature of the thermostatic water is 25 ℃;

(3) putting the mixture b prepared in the step (2) into a material distributor;

(4) and (3) uniformly distributing the mixture b in a mold by using a distributing machine, performing vacuum pumping on the mixture b by using a press, and performing press forming to obtain an artificial stone product, wherein the vacuum degree is more than 0.095Mpa, so that the artificial marble color difference is improved.

The following is a more specific example.

Example 1

A method for improving the color difference of artificial marble comprising the steps of:

(1) taking the weight percentage as a unit, putting 75 percent of calcium carbonate powder, 1 percent of auxiliary agent, 2 percent of kaolin and 15 percent of inorganic binder into a constant-temperature stirrer for fully stirring, wherein the temperature of the constant-temperature stirrer is 25 ℃, and the stirring is carried out for 20min at the stirring frequency of 32Hz and the speed of 60r/min to prepare a mixture a; the auxiliary agent comprises an auxiliary agent a, an auxiliary agent b and an auxiliary agent c which are mixed; the additive a is 4, 4-diaminostilbene-2, 2-disulfonic acid, and the addition amount is 0.03%;

the auxiliary agent b is a lignosulfonate water reducing agent, and the addition amount is 0.5 percent;

the assistant c is a light stabilizer and consists of linear hydroxypiperidinol and linear dibasic acid ester, and the addition amount is 0.47 percent;

the inorganic binder is high-alumina cement;

(2) adding constant-temperature water with the weight percentage of 7% into the mixture a prepared in the step (1) to be stirred and mixed to prepare a mixture b, wherein the temperature of the constant-temperature water is 25 ℃;

(3) putting the mixture b prepared in the step (2) into a material distributor;

(4) and (3) uniformly distributing the mixture b in a mold by using a distributing machine, performing vacuum pumping on the mixture b by using a press, and performing press forming to obtain an artificial stone product, wherein the vacuum degree is more than 0.095Mpa, so that the artificial marble color difference is improved.

Example 2

A method for improving the color difference of artificial marble comprising the steps of:

(1) taking the weight percentage as a unit, putting 74.26 percent of calcium carbonate powder, 1.44 percent of auxiliary agent, 1.9 percent of kaolin and 15.4 percent of inorganic binder into a constant-temperature stirrer for fully stirring, wherein the temperature of the constant-temperature stirrer is 25 ℃, and the mixture is stirred for 17min at the stirring frequency of 40Hz and the speed of 200r/min to prepare a mixture a; the auxiliary agent comprises an auxiliary agent a, an auxiliary agent b and an auxiliary agent c; the additive a is 4, 4-diaminostilbene-2, 2-disulfonic acid, and the addition amount is 0.02 percent;

the auxiliary agent b is polycyclic aromatic salt water reducing agent, and the addition amount is 0.1-0.7%;

the assistant c is a light stabilizer and consists of linear hydroxypiperidinol and linear dibasic acid ester, and the addition amount is 0.72 percent;

the inorganic binder is high-alumina cement;

(2) adding constant-temperature water with the weight percentage of 7% into the mixture a prepared in the step (1) to be stirred and mixed to prepare a mixture b, wherein the temperature of the constant-temperature water is 25 ℃;

(3) putting the mixture b prepared in the step (2) into a material distributor;

(4) and (3) uniformly distributing the mixture b in a mold by using a distributing machine, performing vacuum pumping on the mixture b by using a press, and performing press forming to obtain an artificial stone product, wherein the vacuum degree is more than 0.095Mpa, so that the artificial marble color difference is improved.

Example 3

A method for improving the color difference of artificial marble comprising the steps of:

(1) taking the weight percentage as a unit, putting 74.5 percent of calcium carbonate powder, 1.5 percent of auxiliary agent, 2 percent of kaolin and 16 percent of inorganic binder into a constant-temperature stirrer for fully stirring, wherein the temperature of the constant-temperature stirrer is 25 ℃, and the stirring is carried out for 15min at the stirring frequency of 50Hz and the speed of 300r/min to prepare a mixture a; the auxiliary agent comprises an auxiliary agent a, an auxiliary agent b and an auxiliary agent c; the additive a is 4, 4-diaminostilbene-2, 2-disulfonic acid, and the addition amount is 0.03%;

the assistant b is a water-soluble resin sulfonate water reducing agent, and the addition amount is 0.7 percent;

the assistant c is a light stabilizer and consists of linear hydroxypiperidinol and linear dibasic acid ester, and the addition amount is 0.77 percent;

the inorganic binder is high-alumina cement;

(2) adding constant-temperature water with the weight percentage of 6% into the mixture a prepared in the step (1) to be stirred and mixed to prepare a mixture b, wherein the temperature of the constant-temperature water is 25 ℃;

(3) putting the mixture b prepared in the step (2) into a material distributor;

(4) and (3) uniformly distributing the mixture b in a mold by using a distributing machine, performing vacuum pumping on the mixture b by using a press, and performing press forming to obtain an artificial stone product, wherein the vacuum degree is more than 0.095Mpa, so that the artificial marble color difference is improved.

Comparative example 1

The process was substantially the same as that of example 2, except that the process for improving the color difference of the artificial marble was deficient in the presence of the auxiliary agents a, b and c.

Comparative example 2

Substantially the same as in example 2, except that the auxiliary a is absent in the method for improving the color difference of the artificial marble.

Comparative example 3

Substantially the same as in example 2, except that the auxiliary b is absent in the process for improving the color difference of the artificial marble.

Comparative example 4

Substantially the same as in example 2, except that the auxiliary c is absent in the process for improving the color difference of the artificial marble.

The artificial stone product prepared by the method of the embodiment 1-3 is used for detecting the compression strength, the bending strength and the fire-proof grade, and the detection results are as follows:

experimental groups	Compressive Strength (MPa)	Flexural Strength (MPa)	Fire rating
				Example 1	93.6	12.8	A
Example 2	98	14.5	A
				Example 3	96.7	14	A
Artificial marble standard	50	10	A

Remarking: the compression strength is detected by adopting the national standard GB/T35160.3-2017; the bending strength is detected by adopting the national standard GB/T35160.2-2017; the fire-proof grade is detected by adopting national standard GB 8624-2012; the standard of the artificial marble is in accordance with the technical specification of T/CSBZ 009 and 2019 inorganic artificial stone (plate pressing method) process.

From the above table, it can be seen that: (1) as can be seen from the data of examples 1-3, the compressive strength of the artificial stone product prepared by the method is more than 93.6MPa and more than 87.2 percent of the standard compressive strength of the artificial marble, the bending strength is more than 12.8MPa and more than 28 percent of the standard compressive strength of the artificial marble, and the fire-proof grade is A, which is the same as the standard fire-proof grade of the artificial marble, so that the artificial stone product prepared by the method has excellent performance and is obviously better than the standard of the artificial marble, and in addition, the data of examples 1-3 shows that example 2 is the optimal example.

The artificial stone products were prepared by the methods of example 2 and comparative examples 1 to 4, and the results of the measurement using a color difference meter were as follows.

From the above table, it can be seen that: from the data of the redness values of example 2 and comparative example 1, the effect value of the redness value produced when the aid a, the aid b, and the aid c are used together is |0.18 to 0.66| 0.48; from the redness value data of example 2 and comparative example 2, the effect value of redness value produced by aid a alone can be calculated as |0.18-0.34| 0.16; from the redness value data of example 2 and comparative example 3, the effect value of redness value produced by the aid b alone of |0.18 to 0.25| 0.07; from the redness value data of example 2 and comparative example 4, the effect value of redness value produced by the aid c alone of |0.18 to 0.30| 0.12; by combining the data, the effect value of the redness value generated by the additive a, the additive b and the additive c when the additives are respectively and independently used is calculated to be 0.16+0.07+ 0.12-0.35, and in conclusion, the effect value of the redness value generated by the additive a, the additive b and the additive c when the additives are used together is calculated to be more than 10% of the percentage (0.48-0.35) ÷ 0.35 × 100% + 37.1% of the redness value generated by the additive a, the additive b and the additive c when the additives are respectively and independently used, and the value is more than 10%, which indicates that the additive a, the additive b and the additive c play a synergistic effect in preparing artificial stone products and synergistically reduce the redness value. In the same way, the percentage (0.54-0.38) ÷ 0.38 × 100% ═ 42.1% > 10% of the improvement of the effect value of the yellowness value generated when the aid a, the aid b and the aid c are used together compared with the effect value of the yellowness value generated by the aid a, the aid b and the aid c in a superposition mode when the aid a, the aid b and the aid c are used independently respectively can be calculated, the value is more than 10%, and the synergistic effect of the aid a, the aid b and the aid c in the preparation of the artificial stone product is proved, and the yellowness value is also synergistically reduced. This is because: the additive a is 4, 4-diaminostilbene-2, 2-disulfonic acid, has the effect of improving chromatic aberration, and can solve the phenomena of yellowing and reddening of the artificial stone product; the auxiliary agent b is a polycyclic aromatic salt water reducing agent, and the use amounts of water, inorganic binder, the auxiliary agent a and the auxiliary agent c are reduced; the assistant c is a light stabilizer and consists of straight-chain hydroxypiperidinol and straight-chain dibasic acid ester, plays a role in stabilizing the color of the artificial stone product, and synergistically reduces the red value and the yellow value of the artificial stone product under the mutual cooperation of the assistant a, the assistant b and the assistant c.

Placing the artificial stone product prepared in the example 2 into a color difference meter for detection, and detecting the red value and the yellow value of the artificial stone product; after the test, the sample is put into an ultraviolet aging box for ultraviolet illumination experiment test, and the sample is taken out for detection at intervals, wherein the test data is shown in the following table.

Experiment of	Yellowness index	Redness value
			Before ultraviolet irradiation	0.18	0.24
15 days after ultraviolet irradiation	0.19	0.26
			30 days after ultraviolet irradiation	0.19	0.26
60 days after ultraviolet irradiation	0.19	0.26
			90 days after ultraviolet irradiation	0.19	0.26
180 days after ultraviolet irradiation	0.20	0.27
			365 days after ultraviolet irradiation	0.21	0.28
500 days after ultraviolet irradiation	0.22	0.30

From the above table, it can be seen that: the yellow value and the red value of the artificial stone product are basically unchanged after the artificial stone product is placed in an ultraviolet aging box for 500 days, which shows that the artificial stone product has high combination firmness and strong light resistance.

The above description should not be taken as limiting the invention to the specific embodiments, but rather, as will be readily apparent to those skilled in the art to which the invention pertains, numerous simplifications or substitutions may be made without departing from the spirit of the invention, which should be construed to fall within the scope of the invention as defined in the claims appended hereto.