Water-based color-changeable colorful paint and preparation method thereof

Abstract

The invention relates to a water-based color-changeable colorful coating and a preparation method thereof. The coating comprises the following components in percentage by mass: 20-30 parts of a colorful continuous phase, 40-50 parts of colorful base paint, 0.5-5 parts of a temperature-sensitive color-changing pigment and 15-30 parts of a protective glue solution. The coating disclosed by the invention can automatically change color according to the change of external temperature, and has the characteristics of high response speed, good stability, reversible color observed by naked eyes and the like, so that the problem that the color of the existing water-based multicolor coating is invariable is solved, and the application field of the water-based multicolor coating is widened.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a water-based color-changing multi-color coating and a preparation method thereof. Background Art

[0002] With the continuous development of science and technology and people's pursuit of quality of life, coatings with special functions have received widespread attention. As a new type of coating that can change color according to external environmental conditions (such as temperature, light, humidity, etc.), color-changing coatings have broad application prospects in the fields of decoration, anti-counterfeiting, and smart display. However, existing color-changing coatings often have problems such as unclear color-changing effects, poor stability, and slow response speed, which limits their promotion and use in practical applications. As a decorative coating that has become increasingly popular in recent years, multi-color coatings have great advantages in imitating stone effects. However, existing water-based multi-color coatings are still boring with unchanging colors. Summary of the invention

[0003] The present invention provides a water-based color-changeable multi-color paint and a preparation method thereof. The paint of the present invention can automatically change color according to changes in the external temperature and has the characteristics of fast response speed, good stability, and color reversibility when observed by naked eyes, thereby solving the problem of the conventional water-based multi-color paint having unchanging colors and broadening the application field of the water-based multi-color paint.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A water-based color-changing multi-color paint, comprising the following components in percentage by mass: 20-30 parts of a multi-color continuous phase, 40-50 parts of a multi-color base paint, 0.5-5 parts of a temperature-sensitive color-changing pigment, and 15-30 parts of a protective glue solution;

[0006] The colorful base paint comprises the following components in parts by weight:

[0007] 33-54 parts of water, 0.8-1.2 parts of hydroxyethyl cellulose, 0.5-1 parts of antifreeze agent, 0.1-0.3 parts of anticoagulant, 0.8-1.5 parts of film-forming aid, 1.2-3 parts of titanium dioxide, 3-5 parts of kaolin, 0.1-0.2 parts of pH adjuster, 35-45 parts of acrylic resin, 0.2-0.5 parts of defoaming agent, 0.1-0.8 parts of bactericidal preservative, 4-8 parts of protective glue solution, and 0.2-0.5 parts of thickener.

[0008] According to the above description, the hydroxyl groups contained in the hydroxyethyl cellulose and acrylic resin in the colorful base paint are cross-linked and associated with the lithium ions, magnesium ions and silicate ions in the protective glue solution to form a three-dimensional network structure, which provides strength and hardness for the colored dots. When cured at room temperature, a paint film with a hard surface can be obtained; titanium dioxide can provide covering and whiteness for the product; and kaolin can play a filling role.

[0009] Preferably, the colorful continuous phase comprises the following components in parts by weight:

[0010] 16-42 parts of water, 55-75 parts of acrylic resin, 0.1-1 parts of bactericidal preservative, 2-5 parts of film-forming aid, 0.5-2 parts of antifreeze agent, 0.2-0.4 parts of pH regulator, 0.1-0.4 parts of thickener, 0.1-0.2 parts of defoaming agent.

[0011] According to the above description, film-forming aids can promote better fusion and formation between latex particles in acrylic resin; bactericidal preservatives give the product antibacterial and antiseptic functions; antifreeze agents can lower the freezing point of the paint and enhance the paint's antifreeze properties; thickeners are used to adjust the viscosity of the product.

[0012] Preferably, the protective glue solution comprises the following components in parts by mass: 90-94 parts of water, 5-10 parts of lithium magnesium silicate and 0.1-0.2 parts of fungicide;

[0013] The preparation method of the water-based color-changing multi-color coating comprises the following steps:

[0014] S1. Prepare colorful base paint, colorful continuous phase and protective glue solution according to the formula;

[0015] S2, mixing the temperature-sensitive color-changing pigment and the colorful base paint to obtain the desired color;

[0016] S3, adding a protective glue solution to the colorful base paint after color adjustment in step S2, and then performing screen granulation to obtain colorful dots;

[0017] S4, adding the colorful dots obtained in step S3 into the colorful continuous phase, and stirring evenly to obtain the water-based color-changeable colorful paint.

[0018] Specifically, the protective glue solution is prepared as follows: according to the formula, water is added to a stirring tank, and then lithium magnesium silicate and a bactericidal preservative are added at a rotation speed of 500-1800 r / min, and dispersed for 60-90 minutes until uniform.

[0019] Specifically, the preparation method of the colorful continuous phase is as follows: according to the formula, water is added to the stirring tank, and then acrylic resin, bactericidal preservative, film-forming aid, antifreeze agent, pH regulator, thickener, defoaming agent are added at a speed of 300-600r / min until the viscosity is adjusted to 80-90ku.

[0020] Specifically, the method for preparing the colorful base paint is as follows:

[0021] A1. According to the formula, mix water, hydroxyethyl cellulose, antifreeze agent, anticoagulant and film-forming aid at a speed of 300-500r / min for 3-5min until they are uniform;

[0022] A2. Then continue to add titanium dioxide, kaolin and pH adjuster, and disperse at 800-1200r / min for 15-20min;

[0023] A3. Finally, add acrylic resin, defoamer, bactericide and preservative, protective glue solution and thickener, and stir at 300-500r / min for 10-15min.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the multi-color paint made by the present invention can automatically change color according to the change of the external temperature, and has the characteristics of fast response speed, good stability, and color reversibility, thereby solving the problem of the boring color of the existing water-based multi-color paint, and broadening the application field of water-based multi-color paint. The present invention combines color-changing paint with multi-color, which can not only meet people's pursuit of individuality and artistry, but also reflect a good decorative effect, opening up a new field for the development of multi-color paint. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with specific implementation methods to fully understand the purpose, characteristics and effects of the present invention. The content of this embodiment cannot be used as a limitation on the scope of protection of the technology of the present invention.

[0026] The present invention provides a water-based color-changing multi-color coating, which is made of the following components in parts by mass: 20-30 parts of a multi-color continuous phase, 40-50 parts of a multi-color base paint, 0.5-5 parts of a temperature-sensitive color-changing pigment, and 15-30 parts of a protective glue solution;

[0027] 20-30 parts of colorful continuous phase, 40-50 parts of colorful base paint, 0.5-5 parts of temperature-sensitive color-changing pigment and 15-30 parts of protective glue solution.

[0028] Wherein, the colorful continuous phase comprises the following components in parts by mass:

[0029] 16-42 parts of water, 55-75 parts of acrylic resin (hydroxyl water-based polyurethane dispersion), 0.1-1 parts of bactericidal preservative, 2-5 parts of film-forming aid, 0.5-2 parts of antifreeze agent, 0.2-0.4 parts of pH adjuster, 0.1-0.4 parts of thickener, 0.1-0.2 parts of defoaming agent.

[0030] Preferably, the hydroxyl waterborne polyurethane dispersion is 8087 from Wanhua; the bactericidal preservative is one or more of Mergal 530A from Troy, ATHON LXE from Dow Chemical, and Rocima 562 from Dow Chemical; the film-forming aid is one or more of dipropylene glycol butyl ether and dipropylene glycol methyl ether from Dow Chemical; the antifreeze agent is propylene glycol from Shida Shenghua; the pH adjuster is AMP-95 from Angus; the thickener is RM-8W from Dow Chemical; the defoaming agent is one or more of AM1512 from Shanghai Coneo and SN-325 from San Nopco.

[0031] The colorful base paint comprises the following components in parts by weight:

[0032] 33-54 parts of water, 0.8-1.2 parts of hydroxyethyl cellulose, 0.5-1 parts of antifreeze agent, 0.1-0.3 parts of anticoagulant, 0.8-1.5 parts of film-forming aid, 1.2-3 parts of titanium dioxide, 3-5 parts of kaolin, 0.1-0.2 parts of pH adjuster, 0.1-0.8 parts of bactericidal preservative, 0.2-0.5 parts of defoaming agent, 35-45 parts of acrylic resin, 4-8 parts of protective glue solution, and 0.2-0.4 parts of thickener.

[0033] Preferably, the hydroxyethyl cellulose is a combination of sub-qualon cellulose Natrosol 250HBR and Natrosol250HHBR; the anticoagulant is DC-108 from Grays; the titanium dioxide is R-706 from DuPont; the kaolin is BRITEX-95 from Shanxi Jinyu Kelin Technology Co., Ltd., DG80 from Inner Mongolia Chaopai Building Materials Technology Co., Ltd. or more; the bactericidal preservative is RS from Thor, EPW from Troy, KSG 101 from Guangdong Dimei Biotechnology Co., Ltd. ST and one or more of MBT35 from Guangdong Dimei Biotechnology Co., Ltd.; the defoamer is one or more of BYK-8820 from BYK and Tego825 from Digo; the acrylic resin is Wanhua secondary dispersion 8563; the thickener is one or more of TT-935 and TT-615 of Dow Chemical.

[0034] The protective glue solution comprises the following components in parts by mass: 89.8-94 parts of water, 5.9-10 parts of lithium magnesium silicate and 0.1-0.2 parts of a fungicide.

[0035] Preferably, the lithium magnesium silicate is Hectgel S482 produced by Fenghong.

[0036] It is prepared by the following method:

[0037] S1. Prepare protective glue solution, colorful base paint and colorful continuous phase according to the formula and set aside;

[0038] Wherein, the S1 further comprises the following steps:

[0039] The preparation method of the protective glue solution is as follows: according to the formula, water is added into a stirring tank, the rotation speed is set to 500-1800r / min, and then lithium magnesium silicate and a bactericidal preservative are added, and dispersed for 60-90 minutes until uniform.

[0040] The preparation method of the colorful continuous phase is as follows: according to the formula, water is added into a stirring tank, the speed is set to 300-600r / min, and acrylic resin (hydroxyl waterborne polyurethane dispersion), bactericidal preservative, film-forming aid, antifreeze agent, pH regulator, thickener, and defoaming agent are added in sequence until the viscosity is adjusted to 80-90ku.

[0041] The method for preparing the colorful base paint is as follows:

[0042] A1. According to the formula, mix water, hydroxyethyl cellulose, antifreeze agent, anticoagulant and film-forming aid at a speed of 300-500r / min for 3-5min until they are uniform;

[0043] A2. Continue to add titanium dioxide, kaolin and pH adjuster, and disperse at 800-1200r / min for 15-20min;

[0044] A3. Add acrylic resin, defoamer, bactericidal preservative, protective glue solution and thickener in sequence, and stir at 300-500r / min for 10-15min to prepare the product.

[0045] S2. Select colorful base paint and temperature-sensitive color-changing pigments to mix different colors;

[0046] S3, adding protective glue solution to the toned colorful base paint, and performing screen granulation to obtain colorful dots;

[0047] S4. Add the colorful continuous phase and stir evenly to obtain the product.

[0048] Example 1

[0049] A water-based color-changing multi-color paint is prepared from the following components in parts by mass: 20 parts of a multi-color continuous phase, 40 parts of a multi-color base paint, 0.5 parts of a temperature-sensitive color-changing pigment, and 29.5 parts of a protective glue solution.

[0050] Wherein, the colorful continuous phase mainly includes the following components in parts by mass:

[0051] 42 parts of water, 55 parts of acrylic resin (hydroxyl aqueous polyurethane dispersion), 0.1 parts of bactericidal preservative, 2 parts of film-forming aid, 0.5 parts of antifreeze agent, 0.2 parts of pH adjuster, 0.1 parts of thickener, and 0.1 parts of defoaming agent.

[0052] The colorful base paint mainly includes the following components in parts by weight:

[0053] 54 parts of water, 0.8 parts of hydroxyethyl cellulose (0.5 parts of Natrosol 250HBR, 0.3 parts of Natrosol 250HHBR), 0.5 parts of antifreeze agent, 0.1 parts of anticoagulant, 0.8 parts of film-forming aid, 1.2 parts of titanium dioxide, 3 parts of kaolin, 0.1 parts of pH adjuster, 0.1 parts of bactericidal preservative, 0.2 parts of defoaming agent, 35 parts of acrylic resin, 4 parts of protective glue solution, and 0.2 parts of thickener.

[0054] Wherein, the temperature-sensitive color-changing pigment is Runba WS1610.

[0055] The protective glue solution mainly includes the following components in parts by mass: 94 parts of water, 5.9 parts of lithium magnesium silicate and 0.1 parts of fungicide.

[0056] It is prepared by the following method:

[0057] S1. Prepare protective glue solution, colorful base paint and colorful continuous phase according to the formula and set them aside;

[0058] The preparation method of the protective glue solution is as follows: according to the formula, water is added to the stirring tank, the speed is set to 500r / min, and then lithium magnesium silicate and a bactericidal preservative are added, and dispersed for 90 minutes until uniform.

[0059] The preparation method of the colorful continuous phase is as follows: according to the formula, water is added into the stirring tank, the speed is set to 300r / min, and hydroxyl waterborne polyurethane dispersion, bactericidal preservative, film-forming aid, antifreeze agent, pH regulator, thickener and defoamer are added in sequence until the viscosity is adjusted to 80-90ku.

[0060] The method for preparing the colorful base paint is as follows:

[0061] A1. According to the formula, mix water, hydroxyethyl cellulose, antifreeze agent, anticoagulant and film-forming aid at 300 r / min for 5 minutes until uniform;

[0062] A2. Continue to add titanium dioxide, kaolin and pH adjuster, and disperse at 800r / min for 20min;

[0063] A3. Add acrylic resin, defoamer, bactericidal preservative, protective glue solution and thickener in sequence, and stir at 300 r / min for 15 minutes.

[0064] S2. Select colorful base paint and temperature-sensitive color-changing pigments to mix different colors;

[0065] S3, adding protective glue solution to the toned colorful base paint, and performing screen granulation to obtain colorful dots;

[0066] S4. Add the colorful continuous phase and stir evenly to obtain the product.

[0067] Example 2

[0068] The water-based color-changing multi-color coating of this embodiment is made of the following components in parts by mass: 25 parts of a multi-color continuous phase, 45 parts of a multi-color base paint, 2.5 parts of a temperature-sensitive color-changing pigment, and 27.5 parts of a protective glue solution.

[0069] Wherein, the colorful continuous phase includes, by mass percentage:

[0070] 29.1 parts of water, 65 parts of acrylic resin (hydroxyl aqueous polyurethane dispersion), 0.6 parts of bactericidal preservative, 3 parts of film-forming aid, 1.5 parts of antifreeze agent, 0.3 parts of pH adjuster, 0.3 parts of thickener, and 0.2 parts of defoaming agent.

[0071] Wherein, the colorful base paint includes, by mass percentage:

[0072] 43.5 parts of water, 1 part of hydroxyethyl cellulose (0.4 parts of Natrosol 250HBR, 0.6 parts of Natrosol 250HHBR), 0.8 parts of antifreeze agent, 0.2 parts of anticoagulant, 1.2 parts of film-forming aid, 2 parts of titanium dioxide, 4 parts of kaolin, 0.1 parts of pH adjuster, 0.5 parts of bactericidal preservative, 0.3 parts of defoaming agent, 40 parts of acrylic resin, 6 parts of protective glue solution, and 0.4 parts of thickener.

[0073] Wherein, the temperature-sensitive color-changing pigment is Runba WS1610.

[0074] The protective glue solution is composed of 91.9 parts of water, 8 parts of lithium magnesium silicate and 0.1 parts of fungicide by mass percentage.

[0075] The steps of the preparation method of the water-based color-changing multi-color coating of this embodiment are the same as those of Example 1.

[0076] The preparation method of the protective glue solution is as follows: according to the formula, water is added to the stirring tank, and then lithium magnesium silicate and a bactericidal preservative are added at a rotation speed of 1800 r / min, and dispersed for 60 minutes until uniform.

[0077] The preparation method of the colorful continuous phase is as follows: according to the formula, water is added into a stirring tank, and then acrylic resin, bactericidal preservative, film-forming aid, antifreeze agent, pH regulator, thickener and defoamer are added at a speed of 600 r / min until the viscosity is adjusted to 80-90 ku.

[0078] The method for preparing the colorful base paint is as follows:

[0079] A1. According to the formula, mix water, hydroxyethyl cellulose, antifreeze agent, anticoagulant and film-forming aid at 500r / min for 3 minutes until they are uniform;

[0080] A2, then continue to add titanium dioxide, kaolin and pH adjuster, and disperse at 1200r / min for 15min;

[0081] A3. Finally, add acrylic resin, defoamer, bactericide and preservative, protective glue solution and thickener, and stir at 500r / min for 10min.

[0082] Example 3

[0083] The water-based color-changing multi-color coating of this embodiment is made of the following components in parts by mass: 30 parts of a multi-color continuous phase, 50 parts of a multi-color base paint, 5 parts of a temperature-sensitive color-changing pigment, and 15 parts of a protective glue solution.

[0084] Wherein, the colorful continuous phase includes, by mass percentage:

[0085] 16 parts of water, 75 parts of acrylic resin (hydroxyl aqueous polyurethane dispersion), 1 part of bactericidal preservative, 5 parts of film-forming aid, 2 parts of antifreeze agent, 0.4 parts of pH adjuster, 0.4 parts of thickener, and 0.2 parts of defoaming agent.

[0086] Wherein, the colorful base paint includes, by mass percentage:

[0087] 33 parts of water, 1.2 parts of hydroxyethyl cellulose (0.3 parts of Natrosol 250HBR, 0.9 parts of Natrosol 250HHBR), 1 part of antifreeze agent, 0.3 parts of anticoagulant, 1.5 parts of film-forming aid, 3 parts of titanium dioxide, 5 parts of kaolin, 0.2 parts of pH adjuster, 0.8 parts of bactericidal preservative, 0.5 parts of defoaming agent, 45 parts of acrylic resin, 8 parts of protective glue solution, and 0.3 parts of thickener.

[0088] Wherein, the temperature-sensitive color-changing pigment is Runba WS1610.

[0089] The protective glue solution is composed of 89.8 parts of water, 10 parts of lithium magnesium silicate and 0.2 parts of fungicide in percentage by mass.

[0090] The preparation method of the water-based color-changing multi-color coating of this embodiment is the same as that of embodiment 1.

[0091] The preparation method of the protective glue solution is as follows: according to the formula, water is added to the stirring tank, and then lithium magnesium silicate and a bactericidal preservative are added at a rotation speed of 1200r / min, and dispersed for 70 minutes until uniform.

[0092] The preparation method of the colorful continuous phase is as follows: according to the formula, water is added into a stirring tank, and then acrylic resin, bactericidal preservative, film-forming aid, antifreeze agent, pH regulator, thickener and defoamer are added at a speed of 500 r / min until the viscosity is adjusted to 80-90 ku.

[0093] The method for preparing the colorful base paint is as follows:

[0094] A1. According to the formula, water, hydroxyethyl cellulose, antifreeze agent, anticoagulant and film-forming aid were mixed and stirred at 400 r / min for 4 minutes until they were uniform;

[0095] A2, then continue to add titanium dioxide, kaolin and pH adjuster, and disperse at 1000r / min for 12min;

[0096] A3. Finally, add acrylic resin, defoamer, bactericide and preservative, protective glue solution and thickener, and stir at 400r / min for 12min.

[0097] Comparative Example 1

[0098] A water-based color-changing multi-color paint is prepared from the following components in parts by mass: 20 parts of a multi-color continuous phase, 40 parts of a multi-color base paint, 0.5 parts of a temperature-sensitive color-changing pigment, and 29.5 parts of a protective glue solution.

[0099] Wherein, the colorful continuous phase comprises the following components in parts by mass:

[0100] 42 parts of water, 55 parts of hydroxyl aqueous polyurethane dispersion, 0.1 parts of bactericidal preservative, 2 parts of film-forming aid, 0.5 parts of antifreeze agent, 0.2 parts of pH adjuster, 0.1 parts of thickener and 0.1 parts of defoaming agent.

[0101] Wherein, the colorful base paint includes the following components in parts by mass:

[0102] 54 parts of water, 0.8 parts of hydroxyethyl cellulose (0.5 parts of Natrosol 250HBR, 0.3 parts of Natrosol 250HHBR), 0.5 parts of antifreeze agent, 0.8 parts of film-forming aid, 1.2 parts of titanium dioxide, 3 parts of kaolin, 0.1 parts of pH adjuster, 0.1 parts of bactericidal preservative, 0.2 parts of defoaming agent, 35 parts of acrylic resin, 4 parts of protective glue solution, and 0.3 parts of thickener.

[0103] Wherein, the temperature-sensitive color-changing pigment is Runba WS1610.

[0104] The protective glue solution is composed of 94 parts of water, 5.9 parts of lithium magnesium silicate and 0.1 parts of fungicide by mass percentage.

[0105] It is prepared by the following method:

[0106] Wherein, the S1 further comprises the following steps:

[0107] The protective glue solution is prepared as follows: according to the formula, water is added into a stirring tank, the rotation speed is set to 500 r / min, and then lithium magnesium silicate and a bactericidal preservative are added, and dispersed for 90 minutes until uniform.

[0108] The preparation method of the colorful continuous phase is as follows: according to the formula, water is added into the stirring tank, the speed is set to 300r / min, and hydroxyl waterborne polyurethane dispersion, bactericidal preservative, film-forming aid, antifreeze agent, pH regulator, thickener and defoamer are added in sequence until the viscosity is adjusted to 80-90ku.

[0109] The method for preparing the colorful base paint is as follows:

[0110] A1. According to the formula, mix water, hydroxyethyl cellulose, antifreeze agent and film-forming aid at 300r / min for 5 minutes until they are uniform;

[0111] A2. Continue to add titanium dioxide, kaolin and pH adjuster, and disperse at 800r / min for 20min;

[0112] A3. Add acrylic resin, defoamer, bactericidal preservative, protective glue solution and thickener in sequence, and stir at 300 r / min for 15 minutes.

[0113] S2. Select colorful base paint and temperature-sensitive color-changing pigments to mix different colors;

[0114] S3, adding protective glue solution to the toned colorful base paint, and performing screen granulation to obtain colorful dots;

[0115] S4. Add the colorful continuous phase and stir evenly to obtain the product.

[0116] The difference between this comparative example and Example 1 is that the base paint does not contain an anticoagulant. The principle of the anticoagulant is to prevent the anions of the protective glue from reacting with the cations in the thermochromic pigment to form a gel state by combining the cations with the anions in the protective glue solution.

[0117] Comparative Example 2

[0118] The difference between this comparative example and Example 1 is that it does not contain a temperature-sensitive color-changing pigment, and only uses ordinary water-based color paste for color matching.

[0119] The coatings prepared in Examples 1-3 and Comparative Examples 1 and 2 were subjected to performance tests, and the test results are shown in Table 1 below.

[0120] Table 1 Performance test results

[0121]

[0122]

[0123] As can be seen from Table 1, the various properties of the coating products prepared in Examples 1-3 are generally better than those in Comparative Example 1, and the water-based color-changing multi-color coating provided by the present invention increases the variability of the color of the multi-color coating.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-based color-changing multi-color paint, characterized in that: The invention is prepared from the following components in parts by weight: 20-30 parts of a colorful continuous phase, 40-50 parts of a colorful base paint, 0.5-5 parts of a thermochromic pigment and 15-30 parts of a protective glue solution; The colorful base paint mainly includes the following components in parts by weight: 33-54 parts of water, 0.8-1.2 parts of hydroxyethyl cellulose, 0.5-1 parts of antifreeze agent, 0.1-0.3 parts of anticoagulant, 0.8-1.5 parts of film-forming aid, 1.2-3 parts of titanium dioxide, 3-5 parts of kaolin, 0.1-0.2 parts of pH adjuster, 35-45 parts of acrylic resin, 0.2-0.5 parts of defoaming agent, 0.1-0.8 parts of bactericidal preservative, 4-8 parts of protective glue solution, and 0.2-0.4 parts of thickener.

2. The water-based color-changing multi-color paint according to claim 1, characterized in that: The colorful continuous phase mainly includes the following components in parts by weight: 16-42 parts of water, 55-75 parts of acrylic resin, 0.1-1 parts of bactericidal preservative, 2-5 parts of film-forming aid, 0.5-2 parts of antifreeze agent, 0.2-0.4 parts of pH regulator, 0.1-0.4 parts of thickener, 0.1-0.2 parts of defoaming agent.

3. The water-based color-changing multi-color paint according to claim 1, characterized in that: The protective glue solution mainly comprises the following components in parts by mass: 89.8-94 parts of water, 5.9-10 parts of lithium magnesium silicate and 0.1-0.2 parts of fungicide.

4. A method for preparing a water-based color-changing multi-color coating as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S1, respectively preparing a colorful base paint, a colorful continuous phase and a protective glue solution; S2, mixing the temperature-sensitive color-changing pigment and the colorful base paint to obtain the desired color; S3, adding a protective glue solution to the colorful base paint after color adjustment in step S2, and then performing screen granulation to obtain colorful dots; S4, adding the colorful dots obtained in step S3 into the colorful continuous phase, and stirring evenly to obtain the water-based color-changeable colorful paint.

5. The method for preparing the water-based color-changing multi-color coating according to claim 4, characterized in that: The preparation method of the protective glue solution is as follows: according to the formula, water is added into a stirring tank, and then lithium magnesium silicate and a bactericidal preservative are added at a rotation speed of 500-1800 r / min, and dispersed for 60-90 minutes until uniform.

6. The method for preparing the water-based color-changing multi-color coating according to claim 4, characterized in that: The preparation method of the colorful continuous phase is as follows: according to the formula, water is added into a stirring tank, and then acrylic resin, bactericidal preservative, film-forming aid, antifreeze agent, pH regulator, thickener and defoamer are added at a rotation speed of 300-600 r / min until the viscosity is adjusted to 80-90 ku.

7. The method for preparing the water-based color-changing multi-color coating according to claim 4, characterized in that: The method for preparing the colorful base paint is as follows: A1. According to the formula, mix water, hydroxyethyl cellulose, antifreeze agent, anticoagulant and film-forming aid at a speed of 300-500r / min for 3-5min until they are uniform; A2. Then continue to add titanium dioxide, kaolin and pH adjuster, and disperse at 800-1200r / min for 15-20min; A3. Finally, add acrylic resin, defoamer, bactericide and preservative, protective glue solution and thickener, and stir at 300-500r / min for 10-15min.

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