CN113122099B

CN113122099B - Sand-in-sand mold colorful coating and preparation method thereof

Info

Publication number: CN113122099B
Application number: CN202110500457.9A
Authority: CN
Inventors: 杨帆
Original assignee: Fujian Sankeshu New Material Co ltd
Current assignee: Fujian Sankeshu New Material Co ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2022-06-21
Anticipated expiration: 2041-05-08
Also published as: CN113122099A

Abstract

The invention relates to a sand-in-sand type multicolor paint which is mainly prepared from a protective adhesive, a toning base material, a continuous phase, a pH regulator and a thickening agent, wherein the mass ratio of the protective adhesive to the toning base material to the continuous phase is 10:20-30: 60-70; the pH regulator is 1 per mill of the total mass of the protective glue, the toning base material and the continuous phase; the thickening agent is 3-5 per mill of the total mass of the protective adhesive, the toning base material and the continuous phase; the color points prepared by the preparation method of the sand-in-sand type multicolor paint have high toughness and strength, so that the color points can not deform greatly in the process of mutual extrusion of gun openings during spraying, the sensitivity to spraying air pressure is reduced, the color points can be sprayed by using high air pressure directly, the spraying efficiency is improved, the consumption is reduced, the color stones are not easy to break, the whole color points are clear, and the stone imitation effect is good.

Description

Sand-in-sand mold colorful coating and preparation method thereof

Technical Field

The invention belongs to the field of coatings, and particularly relates to a sand-in-sand type multicolor coating and a preparation method thereof.

Background

The stone-like paint has decorative effect similar to that of marble and granite. It is mainly made up by using natural stone powder with various colours, and can be used for external wall of building to produce imitation stone effect, so that it is also called liquid stone. The building decorated by the stone paint has natural and real natural color, gives people elegant, harmonious and solemn aesthetic feeling, and is suitable for indoor and outdoor decoration of various buildings. Especially, the decoration on the curved surface building is vivid and lifelike and has an effect of returning to the nature. However, the color difference of the natural color sand as the core raw material is serious, which affects the visual and sensory effects of the stone paint, and the stone paint can simulate the stone effect only by matching different color sands, the maximum particle size of the color sand is 10-20 meshes, so that the stone effect cannot be completely simulated by the stone paint when the simulated stone has larger color points. Compared with other coatings, the sand-in-water multicolor coating has good decoration effect, can highlight the simple, elegant and luxury buildings, and can be widely used for decorating indoor and outdoor wall bodies, and imitated granite textures are natural, smooth and blended. The various points of various colours of imitation that sand-in-water multicolor coating can be better, effect unevenness after the spraying, be close to the surface effect of stone material more, but its spraying needs the workman to have abundant experience, will strictly control spraying atmospheric pressure when the spraying, the atmospheric pressure undersize, then the color point is difficult to shakeout, the unsmooth sense of color grain increases, influence imitation stone material effect, the consumption increases simultaneously, atmospheric pressure is too big, then the color point explodes easily, lead to whole effect fuzzy, imitation stone effect is poor. After the water-coated sand is sprayed, the surface generally has less sand grains, has the texture of stone, and still has some differences in stone imitation effect.

In conclusion, the natural stone-like paint is limited by the problems of natural colored sand and the reason that the sand grains on the surface of the sprayed sand-in-water multicolor paint are few, and the sand-in-sand multicolor paint with sand on the surface and color points blended into the sand-in-sand multicolor paint needs to be developed. Therefore, the invention provides a sand-in-sand type multicolor paint and a preparation method thereof.

Disclosure of Invention

The color points prepared by the preparation method of the sand-in-sand type multicolor paint have high toughness and strength, so that the color points are not greatly deformed in the process of mutual extrusion of gun openings during spraying, the sensitivity to spraying air pressure is reduced, and the high-air-pressure spraying can be directly used, so that the spraying efficiency is improved, the consumption is reduced, the color stones are not easy to break, the whole color stone is clear, and the stone imitation effect is good.

The invention is realized by the following technical scheme:

a sand-in-sand mould multicolor paint is mainly prepared from a protective adhesive, a toning base material, a continuous phase, a pH regulator and a thickening agent, wherein the mass ratio of the protective adhesive to the toning base material to the continuous phase is 10:20-30: 60-70; the pH regulator is 1 per mill of the total mass of the protective glue, the toning base material and the continuous phase; the thickening agent is 3-5 per mill of the total mass of the protective adhesive, the toning base material and the continuous phase;

the toning base material is prepared from the following components in parts by mass:

45-65 parts of deionized water, 0.2-0.5 part of mildew preventive, 0.5-0.8 part of dispersant, 0.7-1.2 parts of cellulose, 7-15 parts of filler, 5-10 parts of flexibilizer, 1-3 parts of polyvinyl alcohol, 0.5-1.5 parts of defoamer, 0.1-0.3 part of pH regulator, 20-45 parts of emulsion, 0.5-1.5 parts of film-forming auxiliary agent, 0.5-1.5 parts of antifreezing agent, 0.5-0.8 part of bactericide, 0.2-0.4 part of colorful wetting agent, 5-7 parts of protective adhesive solution and 20-30 parts of snowflake white;

the continuous phase is prepared from the following components in parts by mass:

15-25 parts of deionized water, 0.5-1 part of organic bentonite, 55-70 parts of emulsion, 3-10 parts of film forming additive, 5-10 parts of antifreeze, 0.3-0.5 part of pH regulator, 0.4-0.8 part of thickener and 150 parts of natural color sand.

The protective rubber powder in the protective rubber is S482 aqueous colorful protective rubber powder of German Bike, S482 protective rubber powder of Hemmins or ZT-650 protective rubber powder of Jiangsu Zhitai.

The cross-linking agent in the protective adhesive is a mixture formed by mixing an aziridine cross-linking agent and borax in a mass ratio of 1: 1.

The mildew preventive in the toning base material is an isothiazolinone bactericide;

the dispersant in the toning base material is a sodium polycarboxylate dispersant;

the cellulose in the toning base material is a mixture formed by mixing hydroxyethyl cellulose EHM500, hydroxyethyl cellulose HS100000YP2 and cationic guar gum according to the mass ratio of 1:3-4: 1-2;

the filler in the toning base material is kaolin or is formed by mixing kaolin and titanium dioxide according to the mass ratio of 90-99: 1-10;

the toughening agent in the toning base material is one of a liquid butyronitrile flexibilizer, a resin flexibilizer or a polyvinyl chloride flexibilizer;

the emulsion in the toning base material is a mixture formed by mixing a silicone-acrylic emulsion and a pure acrylic emulsion according to the mass ratio of 1: 1;

the film forming additive in the toning base stock is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;

the antifreezing agent in the toning base material is propylene glycol;

the protective glue solution in the toning base material is 10 mass percent of an S482 waterborne multicolor protective glue powder aqueous solution of German Bike, 10 mass percent of an S482 protective glue powder aqueous solution of Hemmins or 10 mass percent of ZT-650 protective glue powder aqueous solution of Jiangsu Zhitai;

the snowflake white in the toning base material is white sand with the texture of 80-120 meshes;

the emulsion in the continuous phase is a mixed emulsion formed by mixing emulsion RS-2520D and RS-3799A according to the mass ratio of 15-20: 50-55; (RS-2520D is a nano silicone-acrylic emulsion applied to water-based finish paint, the emulsion can react with protective glue solution, so that the system can generate post-thickening reaction, the finished product is ensured to have lower viscosity at the initial stage of stirring and can be quickly and uniformly mixed, and the product has higher viscosity through the post-thickening reaction with the protective glue afterwards.)

The film-forming additive in the continuous phase is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;

the antifreezing agent in the continuous phase is propylene glycol;

the thickening agent in the continuous phase is a hydrophobic modified alkali soluble emulsion type thickening agent.

The natural colored sand in the continuous phase is mixed colored sand formed by mixing 40-80 meshes of natural colored sand and 80-120 meshes of natural colored sand according to the mass ratio of 1: 2-3.

A preparation method of a sand-in-sand mold multicolor paint comprises the following steps:

the protective adhesive is prepared by the following method: adding deionized water into the first container, then adding protective powder and a cross-linking agent at the stirring speed of 1300-1500rpm, and stirring for 30-40min to obtain the material;

the toning base material is prepared by the following method:

adding deionized water into the second container;

then adding the mildew preventive and the dispersant at the stirring speed of 300-500rpm and stirring for 1-2 min;

then adding cellulose and stirring for 5-10min at the stirring speed of 600-;

then, under the stirring speed of 700-900rpm, adding the filler, the flexibilizer, the polyvinyl alcohol, the antifoaming agent and the pH regulator, and then adjusting the rotating speed to 1200-1500rpm and stirring for 15-25 min;

then adding the emulsion, the film forming additive, the antifreezing agent, the bactericide and the multicolor wetting agent at the stirring speed of 1000-;

then adding the protective glue solution and stirring for 8-10min at the stirring speed of 1100-1300 rpm;

finally, adding the snowflake white into the mixture at the stirring speed of 1000-1200rpm and stirring the mixture for 10 to 15min to obtain the toning base material;

the continuous phase is prepared by the following method:

adding deionized water into the third container;

then adding organic bentonite and stirring for 15-25min at the stirring speed of 900-1100 rpm;

then adding the emulsion, the film forming additive, the antifreezing agent and the pH regulator into the mixture at the stirring speed of 800-1000rpm and stirring for 10 min;

then adding the thickening agent and stirring for 2-7min at the stirring speed of 1100-1300 rpm.

And finally, adding the natural colored sand and stirring for 10-15min at the stirring speed of 600-800rpm, stopping stirring and cooling to room temperature to obtain the continuous phase.

When in use, the toning base material is added into the protective adhesive, and then granulation is carried out to obtain the color dots; then mixing the color points, adding the color points into a continuous phase, and then adding a pH regulator and a thickening agent, wherein the mass ratio of the protective adhesive to the toning base material to the continuous phase is 10:20-30: 60-70; the pH regulator is 1 per mill of the total mass of the protective glue, the toning base material and the continuous phase; the thickening agent is 3-5 per mill of the total mass of the protective glue, the toning base material and the continuous phase.

The conventional color dots are easy to disperse and not form under a larger pressure, but the toughness of the color dots is enhanced by the following means:

a polyfunctional aziridine crosslinking agent is introduced into the system, and when the toning base paint is added into the protective adhesive for granulation, the aziridine crosslinking agent can chemically react with various functional groups on the surfaces of the colored particles, such as carboxyl, hydroxyl and the like, so as to generate chemical crosslinking, form a layer of crosslinked network structure on the surfaces of the colored particles, and enhance the strength and toughness of colored points;

the toughening agent is introduced into the system, so that the cohesion of the toning base paint is enhanced, the color points after granulation have certain elasticity, and the painting base paint can bear larger painting air pressure without being broken during painting and can bear the shearing force generated by the shaking of the finish paint without being broken during transportation.

Polyvinyl alcohol is introduced into the toning base material, and when the toning base material is added into the protective adhesive for granulation, gelation reaction can occur under the action of borax, so that the toughness of the colorful granules is further increased, and the colorful granules can be elongated to a certain extent without breaking under the action of external force.

The cellulose EHM500 can be associated with the emulsion AP4765 to form a physical cross-linking structure in the toning base paint, so that the strength of the color point is further increased.

The sand-coated sand multicolor paint is sprayed by using a real stone paint spray gun, so that different surface effects such as planes, burned surfaces and litchi surfaces can be sprayed by adjusting the air pressure of the spray gun, and a higher stone imitation effect is achieved.

The cellulose EHM500 and the cationic guar gum can react with the protective gum solution to enhance the thixotropic property of the colored dots, so that the colored dots can be elongated in the granulation stage, the thickness of the colored dots is effectively reduced, the sprayed colored dots can be well blended into the colored sand in the continuous phase, and the stone imitation effect is improved;

the continuous phase emulsion uses RS-2520D, and the emulsion can be subjected to thickening reaction with protective glue, so that the finish paint has lower viscosity in the mixing stage, and after the finish paint is mixed for 8-12h, the viscosity of the finish paint is continuously increased to reach the ideal construction viscosity of 80000 +/-90000 mp.s (detection equipment is DV2T viscometer manufactured by BROOKFIELD manufacturer, detection adopts 7# rotor, and the shear rate is 6R/min).

Compared with the prior art, the invention has the following advantages:

1. different crosslinking mechanisms are introduced into the sand-coated sand multicolor paint system, and the toughness and the strength of sand-coated sand color points are ensured through the synergistic effect of physical crosslinking and chemical crosslinking, so that the color points are not greatly deformed in the process of mutual extrusion at a muzzle during spraying, the sensitivity to the spraying air pressure is reduced, and the sand-coated sand multicolor paint can be directly sprayed by using the larger air pressure.

2. The cellulose EHM500 and the cationic guar gum can react with the protective gum, so that the thixotropic performance of the colored dots is enhanced, the colored dots can be elongated in the granulating process, the thickness of the colored dots is effectively reduced, the sprayed colored dots can be better blended into colored sand, and the stone imitation effect is improved.

3. The emulsion which can be thickened with the protective adhesive is introduced, so that the viscosity of a finished product is lower during preparation, the finished product is easier to mix uniformly, after the finished product is mixed, the viscosity of the system is continuously increased through the post-thickening effect of the emulsion and the protective adhesive, and the ideal construction viscosity is reached after 8-12 h.

Detailed Description

The present invention is further illustrated by the following preferred examples of the invention, which are intended to be illustrative only and are not intended to be limiting. In addition, other raw materials used in the present invention are those generally used in the art.

In the present invention, the units indicating the content of the raw materials are in parts by weight and in kilograms unless otherwise specified.

Example 1

The protective adhesive is prepared by the following method: adding deionized water into the first container, adding the protective powder and the cross-linking agent at the stirring speed of 1300rpm, and stirring for 30min to obtain the coating;

the toning base material is prepared by the following method:

adding deionized water into the second container;

then adding the mildew preventive and the dispersant at the stirring speed of 300rpm and stirring for 1 min;

then adding cellulose and stirring for 5min at the stirring speed of 600 rpm;

then adding the filler, the toughening agent, the polyvinyl alcohol, the defoaming agent and the pH regulator at the stirring speed of 700rpm, adjusting the rotating speed to 1200rpm and stirring for 15 min;

then adding the emulsion, the film forming additive, the antifreezing agent, the bactericide and the multicolor wetting agent into the mixture and stirring the mixture for 5min at the stirring speed of 1000 rpm;

then adding a protective glue solution and stirring for 8min at the stirring speed of 1100 rpm;

finally, adding the snowflake white into the mixture at the stirring speed of 1000rpm and stirring the mixture for 10min to obtain the toning base material;

the continuous phase is prepared by the following method:

adding deionized water into the third container;

then adding organic bentonite and stirring for 15min at the stirring speed of 900 rpm;

then adding the emulsion, the film forming aid, the antifreezing agent and the pH regulator into the mixture at the stirring speed of 800rpm, and stirring the mixture for 10 min;

then the thickener was added and stirred for 2min at a stirring speed of 1100 rpm.

And finally, adding the natural colored sand and stirring for 10min at the stirring speed of 600rpm, stopping stirring and cooling to room temperature to obtain the continuous phase.

When in use, the toning base material is added into the protective adhesive, and then granulation is carried out to obtain the color dots; then mixing the color points, adding the color points into a continuous phase, and then adding a pH regulator and a thickening agent, wherein the pH regulator is 1 per mill of the total mass of the protective glue, the toning base material and the continuous phase; the thickening agent is 3 per mill of the total mass of the protective adhesive, the toning base material and the continuous phase.

Example 2

The protective adhesive is prepared by the following method: adding deionized water into the first container, adding the protective powder and the cross-linking agent at the stirring speed of 1500rpm, and stirring for 40min to obtain the coating;

the toning base material is prepared by the following method:

adding deionized water into the second container;

then adding the mildew preventive and the dispersant at the stirring speed of 500rpm and stirring for 2 min;

then adding cellulose and stirring for 10min at the stirring speed of 800 rpm;

then adding the filler, the toughening agent, the polyvinyl alcohol, the defoaming agent and the pH regulator at the stirring speed of 900rpm, adjusting the rotating speed to 1500rpm and stirring for 25 min;

then adding the emulsion, the film forming additive, the antifreezing agent, the bactericide and the multicolor wetting agent into the mixture and stirring the mixture for 10min at the stirring speed of 1200 rpm;

then adding the protective glue solution and stirring for 10min at the stirring speed of 1300 rpm;

finally, adding the snowflake white into the mixture at the stirring speed of 1200rpm, and stirring the mixture for 15min to obtain the toning base material;

the continuous phase is prepared by the following method:

adding deionized water into the third container;

then adding organic bentonite and stirring for 25min at the stirring speed of 1100 rpm;

then adding the emulsion, the film forming additive, the antifreezing agent and the pH regulator into the mixture at the stirring speed of 1000rpm, and stirring for 10 min;

then the thickener was added and stirred for 7min at a stirring speed of 1300 rpm.

And finally, adding the natural colored sand and stirring for 15min at the stirring speed of 800rpm, stopping stirring and cooling to room temperature to obtain the continuous phase.

When in use, the toning base material is added into the protective adhesive, and then granulation is carried out to obtain the color dots; then mixing the color points, adding the color points into a continuous phase, and then adding a pH regulator and a thickening agent, wherein the pH regulator is 1 per mill of the total mass of the protective glue, the toning base stock and the continuous phase; the thickening agent is 5 per mill of the total mass of the protective glue, the toning base material and the continuous phase.

Example 3

The protective adhesive is prepared by the following method: adding deionized water into the first container, adding the protective powder and the cross-linking agent at the stirring speed of 1400rpm, and stirring for 35min to obtain the coating;

the toning base material is prepared by the following method:

adding deionized water into the second container;

then adding the mildew preventive and the dispersant and stirring for 1.5min at the stirring speed of 400 rpm;

then adding cellulose and stirring for 6min at the stirring speed of 700 rpm;

then adding the filler, the toughening agent, the polyvinyl alcohol, the defoaming agent and the pH regulator at the stirring speed of 800rpm, adjusting the rotating speed to 1400rpm and stirring for 20 min;

then adding the emulsion, the film forming additive, the antifreezing agent, the bactericide and the multicolor wetting agent into the mixture and stirring the mixture for 8min at the stirring speed of 1100 rpm;

then adding a protective glue solution and stirring for 9min at the stirring speed of 1200 rpm;

finally, adding the snowflake white into the mixture at the stirring speed of 1100rpm and stirring the mixture for 12min to obtain the toning base material;

the continuous phase is prepared by the following method:

adding deionized water into the third container;

then adding organic bentonite and stirring for 20min at the stirring speed of 1000 rpm;

then adding the emulsion, the film forming additive, the antifreezing agent and the pH regulator into the mixture at the stirring speed of 900rpm, and stirring for 10 min;

then the thickener was added and stirred for 5min at a stirring speed of 1200 rpm.

And finally, adding the natural colored sand and stirring for 12min at the stirring speed of 700rpm, stopping stirring and cooling to room temperature to obtain the continuous phase.

When in use, the toning base material is added into the protective adhesive, and then granulation is carried out to obtain the color dots; then mixing the color points, adding the color points into a continuous phase, and then adding a pH regulator and a thickening agent, wherein the pH regulator is 1 per mill of the total mass of the protective glue, the toning base stock and the continuous phase; the thickening agent is 4 per mill of the total mass of the protective glue, the toning base material and the continuous phase.

TABLE 1 dosage of each raw material of examples 1-3

The sand-coated sand type multicolor paint prepared in the above examples 1 to 3 is detected according to the relevant standards in HG/T4343-:

the components of the above examples are preferably the following:

the protective glue powder in the protective glue is an S482 waterborne multicolor protective glue of Germany Bick;

Color matching base material:

the mildew preventive is MERGAL 786 which is an isothiazolinone bactericide;

the dispersant is OROTAN 731A, which is a general-purpose sodium polycarboxylate dispersant;

the cellulose is a mixture of hydroxyethyl cellulose EHM500, hydroxyethyl cellulose HS100000YP2 and cationic guar gum according to a mass ratio of 1:3-4: 1-2;

the filler is kaolin DB-80 and titanium dioxide LR-996 accounting for 0-10% of the total weight of the filler;

the toughening agent is one of a liquid butyronitrile flexibilizer, a resin flexibilizer and a polyvinyl chloride flexibilizer;

the polyvinyl alcohol is PVA 1788;

the antifoaming agent is FoamStar A10 of Corning company;

the pH regulator is AMP-95 of Dow chemistry;

the emulsion is a mixture of silicone-acrylic emulsion LR7115 and pure acrylic emulsion AP4765 according to the mass ratio of 1: 1;

the film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;

the anti-freezing agent is propylene glycol produced by the ocean chemical industry;

the bactericide is a broad-spectrum in-tank bactericide of MERGAK 9N;

the protective glue solution is an S482 solution with the mass fraction of 10%;

the snowflake white is white sand with the texture of 80-120 meshes;

the colorful wetting agent is G-399 of Shanghai grid International trade company Limited.

Continuous phase:

the organic bentonite is prepared by activating common calcium-based bentonite and modifying the common calcium-based bentonite by using an organic cationic surfactant, and is the bentonite with the trademark of MZ of Shanghai grid International trade company Limited.

The emulsion is formed by mixing emulsion RS-2520D and RS3799A according to a ratio of 15-20: 50-55;

the film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;

the pH regulator is AMP-95 of Dow chemistry;

the thickening agent is ACRYSOL TT-935 which is a hydrophobic modified alkali soluble emulsion thickening agent.

The natural color sand is prepared by matching 40-80-mesh natural color sand and 80-120-mesh natural color sand according to the mass ratio of 1:2-3, the color series of the natural color sand comprises but is not limited to black series color sand, red series color sand, yellow series color sand, white series color sand, green series color sand, gray series color sand and blue series color sand, the color matching of the natural color sand is matched according to the color effect to be achieved, and the natural color sand can be color sand with a single color or color sand matching with a plurality of colors.

When the coating of the above examples 1 to 3 was sprayed by a pressure of 0.5 MPa, the color dots were not broken, so that the overall effect was clear and the stone-like effect was good. When the air pressure spraying of the invention is used for the common multicolor paint in the market, the color points are easy to be broken, the integral effect is blurred, and the stone imitation effect is poor.

Claims

1. The sand-in-sand mold multicolor paint is characterized by mainly being prepared from a protective adhesive, a toning base material, a continuous phase, a pH regulator and a thickening agent, wherein the mass ratio of the protective adhesive to the toning base material to the continuous phase is 10:20-30: 60-70; the pH regulator is 1 per mill of the total mass of the protective glue, the toning base material and the continuous phase; the thickening agent is 3-5 per mill of the total mass of the protective adhesive, the toning base material and the continuous phase;

the protective adhesive is prepared from the following components in parts by mass: 90-95 parts of deionized water, 5-10 parts of protective rubber powder and 0.2-0.5 part of cross-linking agent;

15-25 parts of deionized water, 0.5-1 part of organic bentonite, 55-70 parts of emulsion, 3-10 parts of film forming additive, 5-10 parts of antifreeze, 0.3-0.5 part of pH regulator, 0.4-0.8 part of thickener and 150 parts of natural color sand;

2. The multicolor paint for sand bags and sand molds as claimed in claim 1, which is characterized in that: the protective rubber powder in the protective rubber is S482 aqueous colorful protective rubber powder of German Bike, S482 protective rubber powder of Hemmins or ZT-650 protective rubber powder of Jiangsu Zhitai.

3. The multicolor paint for sand bags and sand molds as claimed in claim 1, which is characterized in that: the cellulose in the toning base material is a mixture formed by mixing hydroxyethyl cellulose EHM500, hydroxyethyl cellulose HS100000YP2 and cationic guar gum according to the mass ratio of 1:3-4: 1-2.

4. The multicolor paint for sand bags and sand molds as claimed in claim 1, which is characterized in that:

the mildew inhibitor in the toning base material is an isothiazolinone bactericide;

the film-forming assistant in the toning base material is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;

the antifreezing agent in the toning base material is propylene glycol;

the snowflake white in the toning base material is white sand with the texture of 80-120 meshes.

5. The multicolor paint for sand bags and sand molds as claimed in claim 1, which is characterized in that:

the protective glue solution in the toning base material is 10 mass percent of an S482 aqueous colorful protective glue powder solution of Germany Bike, 10 mass percent of an S482 protective glue powder solution of Hemmins or 10 mass percent of ZT-650 protective glue powder solution of Jiangsu Zhitai.

6. The multicolor paint for sand bags and sand molds as claimed in claim 1, which is characterized in that:

the emulsion in the continuous phase is a mixed emulsion formed by mixing emulsion RS-2520D and RS-3799A according to the mass ratio of 15-20: 50-55.

7. The multicolor paint for sand bags and sand molds as claimed in claim 1, which is characterized in that:

the antifreezing agent in the continuous phase is propylene glycol;

the thickening agent in the continuous phase is a hydrophobic modified alkali soluble emulsion type thickening agent;

8. A method for preparing a sand-in-sand mould multicolor paint according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:

the protective adhesive is prepared by the following method: adding deionized water into the first container, then adding protective rubber powder and a cross-linking agent at the stirring speed of 1300-1500rpm, and stirring for 30-40min to obtain the adhesive;

the toning base material is prepared by the following method:

adding deionized water into the second container;

then adding cellulose and stirring for 5-10min at the stirring speed of 600-;

finally, under the stirring speed of 1000-1200rpm, adding the snowflake white and stirring for 10-15min to obtain the toning base material;

the continuous phase is prepared by the following method:

adding deionized water into the third container;

then adding the organic bentonite and stirring for 15-25min at the stirring speed of 900-1100 rpm;

then adding the thickening agent and stirring for 2-7min at the stirring speed of 1100-1300 rpm;

finally, adding the natural colored sand and stirring for 10-15min at the stirring speed of 600-800rpm, stopping stirring and cooling to room temperature to obtain the continuous phase;