CN105969016A - Reflective insulation colorful coating and preparation method thereof - Google Patents

Abstract

The invention relates to a reflective heat-insulating colorful paint and a preparation method thereof. The colorful paint includes a protective sol with a weight ratio of 10% to 30%, a color dispersed phase base paint with a weight ratio of 30% to 50%, and a weight ratio of 20% %~50% of the continuous phase varnish, the color dispersed phase base paint and the continuous phase varnish all contain glass beads. The present invention is based on synthetic emulsion, without relying on the addition of natural colored sand, the stone-like effect can be obtained, and has reproducibility; the whole colorful coating of the multi-color coating made by the preparation method of the invention has the function of reflection and heat insulation, The heat insulation effect is good, and the energy saving effect is improved.

Description

A kind of reflective heat-insulating colorful paint and preparation method thereof

technical field

The invention relates to an exterior wall paint, in particular to a reflective heat-insulating colorful paint and a preparation method thereof.

Background technique

At present, the imitation stone paint for exterior walls mainly includes real stone paint and colorful paint, and colorful paint is more realistic with its unique pattern simulation effect. Real stone paint is blended from natural colored sand, and the natural colored sand mine is increasingly depleted, and the prospect of real stone paint is worrying. Colorful paint is based on synthetic emulsion, does not rely on colored sand, and is sustainable. It will be the pillar product of imitation stone paint in the future.

Reflective heat-insulating coating is an important technology for reducing energy consumption of building exterior walls. General reflective heat-insulating coatings are not very applicable to civil engineering due to their single color and poor decoration. Combining reflective heat insulation technology with colorful coatings is an important technological breakthrough to improve the energy-saving and decorative properties of building exterior walls.

Chinese invention patent application CN 104151979 A discloses a water-in-water reflective heat-insulating colorful coating, which can realize the reflective heat-insulating effect by adding 2-30% of the total weight of reflective heat-insulating powder, and the reflective heat-insulating powder is rutile type titanium dioxide powder Body, expensive, not conducive to the mass use of the product.

Chinese invention patent application CN 104804601 A discloses a high-performance heat-insulating and heat-preserving multi-color coating. Hollow microspheres with a total weight of 10-15% are added to the dispersed phase base color paint to make colored dot particles with reflective heat insulation effect, while The coverage of colored dot particles on the surface is only 30%-80%, which is not enough to cover the entire wall, resulting in a decrease in the reflective heat insulation effect and affecting product performance.

Contents of the invention

The problem to be solved by the present invention is to overcome the deficiencies in the prior art, and provide a reflective heat-insulating colorful paint and a preparation method thereof.

The colorful paint of the invention can reflect and insulate sunlight, thereby achieving the function of saving energy consumption of building air conditioners. Among similar reflective and heat-insulating liquid granite colorful coatings, only the color-point particles made of dispersed phase base paint have the function of reflective heat-insulation, and the coverage of the color-point particles on the surface is only 30%-80%, resulting in a reflective heat-insulation effect. decline. A major innovative breakthrough point of the present invention compared with similar reflective heat-insulating colorful coatings is: the first addition of glass beads with reflective heat-insulating effect in the continuous phase varnish, so that the entire colorful coating has reflective heat-insulated function, thereby improving energy-saving effect.

Tests have proved that when the amount of hollow glass microspheres added to the dispersed phase base paint reaches 8%, the resulting coating begins to have a more obvious reflective and heat-insulating effect. % or more, the improvement trend of reflective heat insulation effect begins to slow down. Considering cost factors and reflective heat insulation effect, the best addition amount of hollow glass microspheres is 8%-15%.

The present invention uses deionized water instead of general industrial tap water or underground water, and the deionized water in the dispersed phase base paint, protective sol and continuous phase varnish is water treated by professional deionized water equipment. The protective colloidal salt is a mixture of magnesium-lithium silicate as the main component. Magnesium-lithium silicate swells in water but does not dissolve, and gradually peels off into flaky charged flakes in the process of water mixing. The end face of the layer is enriched with positive charges, and after the water is dispersed in the water, a "house of cards" structure is gradually formed, that is, the layer layer is connected to the end face. Layered electrons can combine with the functional groups on the hydroxyethyl cellulose in the dispersed phase base paint to form a water-resistant protective film, so that the color TV particles of various colors of the dispersed phase base paint will not mix colors with each other. Tap water or groundwater is rich in positively charged divalent calcium ions, divalent magnesium ions and other multivalent ions, and the positively charged multivalent ions will adsorb negatively charged protective colloidal salt flakes, destroying the "house of cards" structure and the above Water-resistant protective film. Therefore, the present invention employs deionized water free of positively charged multivalent ions.

The present invention pioneers the addition of reflective and heat-insulating materials in the continuous phase of the colorful paint, further improving the reflective and heat-insulating performance of the colorful paint. Tests have proved that when the amount of hollow glass microspheres in the continuous phase reaches 3%, the reflective heat insulation performance of the coating is significantly improved. As the amount of hollow glass microspheres increases, the reflection and heat insulation performance of the coating also increases. However, the increase in the amount of hollow glass microspheres also brings the following negative effects: a. affects the transparency of the coating and affects the final decorative effect; b. makes the viscosity of the coating too high and affects the workability; c. hollow glass microspheres Its specific gravity is smaller than that of water, and it is easy to float up. If the amount is too high, it will easily lead to system instability, microspheres float up, and agglomerate; d. The increase of hollow glass microspheres will directly lead to the increase of coating PVC, and too high PVC will lead to coating Decreased strength and weather resistance. e. Cost increase. Based on the advantages and disadvantages above, it has been proved by experiments that the best addition amount of hollow glass microspheres in the continuous phase is between 3% and 5%. Aiming at the problem that the hollow glass microspheres are easy to float and agglomerate, the present invention selects alkali-swellable thickener and hydroxyethyl cellulose as the thickener of the coating system, which solves the problem of anti-sinking and anti-floating.

The specific plan is as follows:

A reflective and heat-insulating colorful paint, comprising a protective sol with a weight ratio of 10% to 30%, a color dispersed phase base paint with a weight ratio of 30% to 50%, and a continuous phase varnish with a weight ratio of 20% to 50%. Both the color dispersed phase base paint and the continuous phase varnish contain glass beads.

Further, the protective sol is composed of the following weight components:

Deionized water 88%~95%;

Protective colloidal salt 5~12%;

Optionally, the colored dispersed-phase base paint is formed by mixing 95-100% by weight of the dispersed-phase base paint and 0-5% by weight of color paste, and the described dispersed-phase base paint is composed of the following weight components:

Deionized water 5%~30%;

Hydroxyethyl cellulose 0.5~2%;

pH regulator 0.1~0.3%;

Disperse wetting agent 0.3~0.8%;

Defoamer 0.1~0.2%;

Infrared reflective titanium dioxide 3~10%;

Kaolin 3~10%;

Coalescing agent 3~5%;

Antifreeze 1~3%;

Protective sol 3~10%;

Glass beads 8~15%;

Film-forming emulsion 30~40%;

Preservatives 0.2~0.5%;

Optionally, the continuous phase varnish consists of the following components by weight:

Deionized water 20~30%;

Defoamer 0.1~0.5%;

Coalescing agent 3~8%;

Antifreeze 1~3%;

Film former 50%~65%;

Glass beads 3~5%;

Preservatives 0.2~0.5%;

Thickener 2~8%;

pH regulator 0.1~0.3%.

Further, the hydroxyethyl cellulose ether of the dispersed phase base paint is: one or more of Akzo Nobel EBS351FQ, EBS481FQ, EBS451FQ, EHM500 or Ashland HHBR250, HBR250, 10k;

Optionally, the pH regulator of the dispersed-phase base paint and the continuous-phase varnish is: one or more of 2-amino-2-methyl-1-propanol, ammonia or N,N-dimethylethanolamine ;

Optionally, the wetting and dispersing agent of the dispersed phase base paint is: ammonium salt or potassium salt wetting and dispersing agent.

Further, the defoamer of the dispersed phase base paint and the continuous phase varnish is: one or both of mineral oil defoamers or silicone defoamers;

Optionally, the infrared reflective titanium dioxide of the dispersed phase base paint is rutile titanium dioxide;

Optionally, the kaolin particle size of the dispersed phase base paint is 2000 mesh-4000 mesh;

Optionally, the coalescent of the dispersed phase base paint and the continuous phase varnish is one or both of Eastman TEXANOL or dodecyl alcohol ester.

Further, the antifreeze agent of the dispersed phase base paint and the continuous phase varnish is: one or more of propylene glycol, polyethylene glycol, polypropylene glycol, and ethylene glycol;

Optionally, the protective colloidal salt of the dispersed phase base paint and protective sol is: LAPONITE-S482 or LAPONITE-RDS or LAPONIE-RD of BYK Chemical Company;

Optionally, the glass beads of the dispersed phase base paint are one or both of 3M's VS5500 and S15 mixed;

Optionally, the film-forming emulsion of the dispersed phase base paint is: one or a mixture of pure acrylic emulsion and silicon-modified acrylic emulsion.

Further, the preservatives of the dispersed phase base paint and the continuous phase varnish are: 2-methyl-4-isothiazoline-2-methyl-4-isothiazoline-3-one, 5-chloro-2- At least one of methyl-4isothiazolin-3-one and formaldehyde;

Optionally, the color paste of the colored dispersed phase base paint is at least one of iron red, iron yellow, cobalt blue and copper black.

Further, the thickener of the continuous phase varnish is: one or a mixture of polyurethane thickener and alkali swelling thickener;

Optionally, the film-former of the continuous phase varnish is at least one of pure acrylic emulsion, silicon-modified acrylic emulsion, and aqueous polyurethane dispersion.

A method for preparing reflective heat-insulating colorful coatings, comprising the following steps:

Preparation of protective sol: Add protective colloidal salt and deionized water into the disperser, stir until the protective colloidal salt dissolves, obtain protective sol, take it out for use;

Preparation of color dispersed phase base paint: Add hydroxyethyl cellulose and deionized water into the disperser, stir until the hydroxyethyl cellulose is dissolved, then add pH regulator, dispersing wetting agent, defoamer in turn, and stir well , then add infrared reflective titanium dioxide, kaolin, stir well, then add film-forming aids, antifreeze, protective colloidal salt, glass microspheres, film-formers and preservatives, and disperse until uniform, add color paste, and disperse evenly , to obtain the color dispersed phase base paint;

Preparation of continuous phase varnish: Add deionized water, defoamer, film-forming aid, antifreeze in turn under the dispersion conditions of the disperser, and then add film-former, hollow glass microspheres, preservatives, thickeners, PH Regulator, after dispersing evenly, slowly add thickener and PH regulator in sequence, adjust the rotation speed, keep forming a vortex without exposing the dispersion disc, disperse until uniform, and obtain a continuous phase varnish;

Prepare the finished product: mix the prepared colored dispersed phase base paint with the protective sol, and granulate it with a colorful special vacuum screen granulator. After obtaining the colored dot granules, add the continuous phase varnish to the colored dot granules, stir evenly to get reflection Heat-insulating colorful paint finished product.

Beneficial effects: the present invention is based on synthetic emulsion, without relying on the addition of natural colored sand, the effect of imitating stone can be obtained, and has reproducibility; the multicolored paint prepared by the preparation method of the present invention, the entire multicolored paint is added to the continuous phase The coating has the function of reflective heat insulation, and its heat insulation effect is good, which improves the energy saving effect.

detailed description

The technical solutions of the present invention will be further elaborated below in conjunction with the embodiments. If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification. The reagents or instruments used were not indicated by the manufacturer, and they were all commercially available conventional products.

Example 1 Preparation of reflective and heat-insulating colorful coatings

The present embodiment is made up of the following components, all are weight ratios, protective sol: dispersed phase base paint: continuous phase varnish=30:35:50, wherein,

The composition of the weight ratio of each component of the dispersed phase base paint:

Deionized water 21.4%

Hydroxyethyl Cellulose 0.9%

PH regulator 0.1%

Disperse wetting agent 0.3%

Defoamer 0.1%

Infrared reflective titanium dioxide 8%

Kaolin 5%

Coalescent 3%

Antifreeze 3%

Protective Colloidal Salt 8%

Glass beads 15%

Film-forming emulsion 35%

Preservatives 0.2%

The composition of the weight ratio of each component of the protective sol:

Deionized water 95%

Protective Colloidal Salt 5%

The continuous phase varnish consists of the following components by weight:

Deionized water 21.4%

Defoamer 1%

Coalescent 4%

Antifreeze 3%

Film former 65%

Glass beads 1%

Preservatives 0.2%

Thickener 5%

pH regulator 0.3%

The preparation method is as follows:

Preparation of protective sol: Add protective colloidal salt and deionized water into the disperser, stir until the protective colloidal salt dissolves, obtain protective sol, take it out for use.

Preparation of color dispersed phase base paint: Add hydroxyethyl cellulose and deionized water into the disperser, stir until the hydroxyethyl cellulose is dissolved, then add pH regulator, dispersing wetting agent, defoamer in turn, and stir well , then add infrared reflective titanium dioxide and kaolin, stir well and then add film-forming aids, antifreeze, protective colloidal salt, glass beads, film-formers and preservatives in turn, after dispersing until uniform, according to the desired color effect, add water-based color paste, and disperse evenly to obtain a color dispersed phase base paint.

Preparation of continuous phase varnish: under low-speed (200-400r/min) dispersing conditions of the disperser, add deionized water, defoamer, film-forming aid, and antifreeze in sequence, increase the speed appropriately to disperse until there is no slick oil on the surface, and then sequentially Add film formers, hollow glass microspheres, preservatives, thickeners, and pH regulators. Adjust the rotation speed, keep forming a vortex without exposing the dispersing disc, disperse for 15-30 minutes, then slowly add thickener and pH regulator in turn, adjust the rotating speed, keep forming a vortex without exposing the dispersing disc, disperse until uniform, and obtain a continuous phase varnish.

Preparation of the finished product: Mix the prepared colored dispersed phase base paint with the protective sol, and granulate it with a colorful special vacuum screen granulator. After obtaining the colored dot granules, add the continuous phase varnish to the colored dot granules, and stir evenly to obtain Reflective thermal insulation colorful paint finished product.

Construction method: Use a 3mm caliber water-in-water colorful special spray gun, adjust the appropriate air pressure, and spray on the required substrate.

Example 2 Preparation of reflective and heat-insulating colorful coatings

This embodiment is composed of components in the following proportions, all in weight ratio, protective sol: dispersed phase base paint: continuous phase varnish = 20:50:50.

The composition of the weight ratio of each component of the dispersed phase base paint:

Deionized water 30%

Hydroxyethyl Cellulose 0.7%

PH regulator 0.3%

Dispersed wetting agent 0.6%

Defoamer 0.2%

Infrared reflective titanium dioxide 3%

Kaolin 3%

Coalescent 5%

Antifreeze 3%

Protective Colloidal Salt 8%

Glass beads 8%

Film-forming emulsion 38%

Preservatives 0.2%

The composition of the weight ratio of each component of the protective sol:

Deionized water 88%

Protective Colloidal Salt 12%

The continuous phase varnish consists of the following components by weight:

Deionized water 26.2%

Defoamer 3%

Coalescent 3%

Antifreeze 1%

Film former 62%

Glass beads 5%

Preservatives 0.2%

Thickener 2%

PH regulator 0.3%

The preparation method is as follows:

Preparation of protective sol: Add protective colloidal salt and deionized water into the disperser, stir until the protective colloidal salt dissolves, obtain protective sol, take it out for use.

Preparation of color dispersed phase base paint: Add hydroxyethyl cellulose and deionized water into the disperser, stir until the hydroxyethyl cellulose is dissolved, then add pH regulator, dispersing wetting agent, defoamer in turn, and stir well , then add infrared reflective titanium dioxide and kaolin, stir well and then add film-forming aids, antifreeze, protective colloidal salt, glass beads, film-formers and preservatives in turn, after dispersing until uniform, according to the desired color effect, add water-based color paste, and disperse evenly to obtain a color dispersed phase base paint.

Preparation of continuous phase varnish: under the low speed (200-400r/min) dispersion condition of dispersant, add deionized water, defoamer, film-forming aid, antifreeze in sequence, increase the speed appropriately to disperse until there is no slick oil on the surface, and then sequentially add Add film formers, hollow glass microspheres, preservatives, thickeners, and pH regulators. Adjust the rotation speed, keep forming a vortex without exposing the dispersing disc, disperse for 15-30 minutes, then slowly add thickener and pH regulator in turn, adjust the rotating speed, keep forming a vortex without exposing the dispersing disc, disperse until uniform, and obtain a continuous phase varnish.

Preparation of the finished product: Mix the prepared colored dispersed phase base paint with the protective sol, and granulate it with a colorful special vacuum screen granulator. After obtaining the colored dot granules, add the continuous phase varnish to the colored dot granules, and stir evenly to obtain Reflective thermal insulation colorful paint finished product.

Construction method: Use a 3mm caliber water-in-water colorful special spray gun, adjust the appropriate air pressure, and spray on the required substrate.

Embodiment 3 performance testing

In the above-mentioned embodiment 1 and embodiment 2, after spraying, the color dot particles on the surface of the board are randomly distributed and are in a relatively uniform state. Various colors of colored dot particles decorate the surface of the board, making the surface of the board present the surface texture of natural granite. According to the color and proportion of different color point particles, different natural stones can be imitated. Due to the inclusion of hollow glass microspheres, the surface of the coating has a sandy feel, making the paint film closer to the texture of natural stone.

According to the standards of "HGT 4343-2012 Waterborne Colorful Architectural Coatings" and "JG/T 235-2008 Architectural Reflective and Heat-Insulating Coatings", Example 1 and Example 2 are tested, and the results are as follows:

Table 1 performance test result table

It can be seen from Table 1 that the reflective and heat-insulating colorful coating prepared by the present invention has good stability, strong weather resistance and excellent performance.

According to "JG/T 235-2008 Architectural Reflective and Heat Insulating Coatings", the requirements for the reflective indicators of the coating are as follows:

Table 2 Reflection index standard table

The reflective performance of the finished coatings of embodiment 1 and embodiment 2 is detected, and its reflective heat insulation performance test results are as follows:

Table 3 Test results of reflective heat insulation performance of finished coatings

It can be seen from Table 3 that the finished coating prepared by the present invention has the function of reflective heat insulation, and its heat insulation effect is good, which effectively improves the energy saving effect.

Example 4

This embodiment is composed of components in the following proportions, all in weight ratio, protective sol: dispersed phase base paint: continuous phase varnish = 20:50:50.

The composition of the weight ratio of each component of the dispersed phase base paint:

Deionized water 22.3%

Hydroxyethyl Cellulose 1.5%

PH regulator 0.1%

Dispersed wetting agent 0.8%

Defoamer 0.1%

Infrared reflective titanium dioxide 3%

Kaolin 10%

Coalescent 4%

Antifreeze 3%

Protective Colloidal Salt 8%

Glass beads 12%

Film-forming emulsion 35%

Preservatives 0.2%

The composition of the weight ratio of each component of the protective sol:

Deionized water 90%

Protective Colloidal Salt 10%

The continuous phase varnish consists of the following components by weight:

Deionized water 30%

Defoamer 1.5%

Coalescent 3%

Antifreeze 1%

Film former 57%

Glass beads 3%

Preservatives 0.3%

Thickener 4%

PH regulator 0.2%

The preparation method is as follows:

Preparation of protective sol: Add protective colloidal salt and deionized water into the disperser, stir until the protective colloidal salt dissolves, obtain protective sol, take it out for use.

Preparation of color dispersed phase base paint: Add hydroxyethyl cellulose and deionized water into the disperser, stir until the hydroxyethyl cellulose is dissolved, then add pH regulator, dispersing wetting agent, defoamer in turn, and stir well , then add infrared reflective titanium dioxide and kaolin, stir well and then add film-forming aids, antifreeze, protective colloidal salt, glass beads, film-formers and preservatives in turn, after dispersing until uniform, according to the desired color effect, add water-based color paste, and disperse evenly to obtain a color dispersed phase base paint.

Preparation of continuous phase varnish: under the low speed (200-400r/min) dispersion condition of dispersant, add deionized water, defoamer, film-forming aid, antifreeze in sequence, increase the speed appropriately to disperse until there is no slick oil on the surface, and then sequentially add Add film formers, hollow glass microspheres, preservatives, thickeners, and pH regulators. Adjust the rotation speed, keep forming a vortex without exposing the dispersing disc, disperse for 15-30 minutes, then slowly add thickener and pH regulator in turn, adjust the rotating speed, keep forming a vortex without exposing the dispersing disc, disperse until uniform, and obtain a continuous phase varnish.

Preparation of the finished product: Mix the prepared colored dispersed phase base paint with the protective sol, and granulate it with a colorful special vacuum screen granulator. After obtaining the colored dot granules, add the continuous phase varnish to the colored dot granules, and stir evenly to obtain Reflective thermal insulation colorful paint finished product.

The prepared reflective heat-insulating colorful coating has good stability, strong weather resistance, reflective heat-insulation function and excellent performance.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (8)

1. A reflective and heat-insulating colorful coating, characterized in that: it comprises a protective sol with a weight ratio of 10% to 30%, a colored dispersed phase base paint with a weight ratio of 30 to 50%, and a weight ratio of 20% to 50%. The continuous phase varnish, the color dispersed phase base paint and the continuous phase varnish all contain glass beads. 2. The reflective heat-insulating colorful paint according to claim 1, characterized in that: Described protective sol is made up of following weight components: Deionized water 88%~95%; Protective colloidal salt 5~12%; Optionally, the colored dispersed-phase base paint is formed by mixing 95-100% by weight of the dispersed-phase base paint and 0-5% by weight of color paste, and the described dispersed-phase base paint is composed of the following weight components: Deionized water 5%~30%; Hydroxyethyl cellulose 0.5~2%; pH regulator 0.1~0.3%; Disperse wetting agent 0.3~0.8%; Defoamer 0.1~0.2%; Infrared reflective titanium dioxide 3~10%; Kaolin 3~10%; Coalescing agent 3~5%; Antifreeze 1~3%; Protective sol 3~10%; Glass beads 8~15%; Film-forming emulsion 30~40%; Preservatives 0.2~0.5%; Optionally, the continuous phase varnish consists of the following components by weight: Deionized water 20~30%; Defoamer 0.1~0.5%; Coalescing agent 3~8%; Antifreeze 1~3%; Film former 50%~65%; Glass beads 3~5%; Preservatives 0.2~0.5%; Thickener 2~8%; pH regulator 0.1~0.3%. 3. The reflective heat-insulating colorful paint according to claim 2, characterized in that: the hydroxyethyl cellulose ether of the dispersed phase base paint is: Akzo Nobel EBS351FQ, EBS481FQ, EBS451FQ, EHM500 or Ashland HHBR250, One or more of HBR250, 10k; Optionally, the pH regulator of the dispersed-phase base paint and the continuous-phase varnish is: one or more of 2-amino-2-methyl-1-propanol, ammonia or N,N-dimethylethanolamine ; Optionally, the wetting and dispersing agent of the dispersed phase base paint is: ammonium salt or potassium salt wetting and dispersing agent. 4. The reflective and heat-insulating colorful coating according to claim 2, characterized in that: the defoamer of the dispersed phase base paint and the continuous phase varnish is: mineral oil defoamer or organosilicon defoamer one or two; Optionally, the infrared reflective titanium dioxide of the dispersed phase base paint is rutile titanium dioxide; Optionally, the kaolin particle size of the dispersed phase base paint is 2000 mesh-4000 mesh; Optionally, the coalescent of the dispersed phase base paint and the continuous phase varnish is one or both of Eastman TEXANOL or dodecyl alcohol ester. 5. The reflective heat-insulating colorful paint according to claim 2, characterized in that: the antifreeze of the dispersed phase base paint and the continuous phase varnish is: one of propylene glycol, polyethylene glycol, polypropylene glycol, and ethylene glycol one or more kinds; Optionally, the protective colloidal salt of the dispersed phase base paint and protective sol is: LAPONITE-S482 or LAPONITE-RDS or LAPONIE-RD of BYK Chemical Company; Optionally, the glass beads of the dispersed phase base paint are one or both of 3M's VS5500 and S15 mixed; Optionally, the film-forming emulsion of the dispersed phase base paint is: one or a mixture of pure acrylic emulsion and silicon-modified acrylic emulsion. 6. The reflective heat-insulating colorful paint according to claim 2, characterized in that: the preservative of the dispersed phase base paint and the continuous phase varnish is: 2-methyl-4-isothiazoline-2-methyl-4- At least one of isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, and formaldehyde; Optionally, the color paste of the colored dispersed phase base paint is at least one of iron red, iron yellow, cobalt blue and copper black. 7. The reflective heat-insulating colorful paint according to claim 2, characterized in that: the thickener of the continuous phase varnish is: one or a mixture of polyurethane thickeners and alkali-swellable thickeners; Optionally, the film-former of the continuous phase varnish is at least one of pure acrylic emulsion, silicon-modified acrylic emulsion, and aqueous polyurethane dispersion. 8. A method for preparing the reflective and heat-insulating colorful paint according to any one of claims 1 to 7, characterized in that: comprising the following steps: Preparation of protective sol: Add protective colloidal salt and deionized water into the disperser, stir until the protective colloidal salt dissolves, obtain protective sol, take it out for use; Preparation of color dispersed phase base paint: Add hydroxyethyl cellulose and deionized water into the disperser, stir until the hydroxyethyl cellulose is dissolved, then add pH regulator, dispersing wetting agent, defoamer in turn, and stir well , then add infrared reflective titanium dioxide, kaolin, stir well, then add film-forming aids, antifreeze, protective colloidal salt, glass microspheres, film-formers and preservatives, and disperse until uniform, add color paste, and disperse evenly , to obtain the color dispersed phase base paint; Preparation of continuous phase varnish: Add deionized water, defoamer, film-forming aid, antifreeze in turn under the dispersing condition of the disperser, and then add film-former, hollow glass microspheres, preservatives, thickeners, PH Regulator, after dispersing evenly, slowly add thickener and PH regulator in sequence, adjust the rotation speed, keep forming a vortex without exposing the dispersion disc, disperse until uniform, and obtain a continuous phase varnish; Prepare the finished product: mix the prepared colored dispersed phase base paint with the protective sol, and granulate it with a colorful special vacuum screen granulator. After obtaining the colored dot granules, add the continuous phase varnish to the colored dot granules, and stir evenly to obtain the reflection Heat-insulating colorful paint finished product.