CN113462272B

CN113462272B - Heat-insulating radiation-proof coating and preparation method thereof

Info

Publication number: CN113462272B
Application number: CN202110661270.7A
Authority: CN
Inventors: 叶维维; 杨名亮; 苏雅丽; 吴培发
Original assignee: Xiamen Sunrui Ship Coating Co ltd
Current assignee: Xiamen Sunrui Ship Coating Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-04-19
Anticipated expiration: 2041-06-15
Also published as: CN113462272A

Abstract

The invention relates to the field of functional coatings, in particular to a heat-insulating radiation-proof coating and a preparation method thereof, wherein the coating comprises a component A and a component B. Wherein, the component A comprises: the coating comprises a resin matrix A, a resin matrix B, a coupling agent, a dispersing agent, a defoaming agent, a solvent, a pigment filler, an infrared reflection filler, a heat insulation filler and a thixotropic agent; wherein the resin matrix A is fluorine-containing acrylic resin; the resin matrix B is hydroxyl acrylic resin; the component B comprises: a curing agent and a solvent; the curing agent is isocyanate curing agent; resin matrix A: the proportion of the resin matrix B to the heat insulation filler is 10-20: 15-30: 10 to 20. According to the invention, the infrared reflection filler, the heat insulation filler and the resin are connected through the coupling agent, and the distribution of the filler in the coating is controlled, so that the prepared composite material has high hemispherical emissivity and high solar reflectance; the coating has good heat-insulating property, corrosion resistance, artificial aging resistance and weather resistance.

Description

Heat-insulating radiation-proof coating and preparation method thereof

Technical Field

The invention relates to the field of functional coatings, in particular to a heat-insulating radiation-proof coating and a preparation method thereof.

Background

The high energy infrared rays in sunlight cause an increase in heat, thereby accelerating the degradation of the resin in the coating and thus accelerating corrosion. And the coating expands with heat and contracts with cold due to high radiation and day and night temperature difference, so that the adhesive force of the coating is reduced. Therefore, heat-insulating radiation-proof coatings need to be developed. Generally, there are three types of thermal barrier coatings: firstly, separation nature thermal barrier coating utilizes self low thermal conductivity, with external and inside isolation to thermal-insulated, common use pearlite powder, hollow glass pearl powder, natural ore fiber material etc. nevertheless this kind of coating mode of insulating against heat is too simple, and leads to the thermal-insulated effect decline of coating because of the barrier layer damage easily, and generally this kind of coating hygroscopicity is big and lead to the degree of bonding to the wall body on the low side. The other is reflective heat insulation coating, also called solar heat reflective coating, which relies on the reflection of sunlight by the coating to achieve the heat insulation effect, and usually comprises infrared reflective pigments such as Antimony Tin Oxide (ATO), Indium Tin Oxide (ITO), Zinc Aluminum Oxide (ZAO), etc., but the coating has poor weather resistance and insufficient adhesive force. The radiation type heat insulation coating absorbs solar radiation through functional filler in the coating, releases the heat radiation to the external environment, and absorbs the released energy conversion process, and the core is to prepare a material with high thermal emissivity, but the preparation process is complex. The three effects of the heat-insulating coating ensure the heat insulation and cooling of the object coated with the coating and ensure that the internal space of the object can keep a lasting constant temperature state.

Chinese patent CN 104830205A discloses a heat-insulating coating and a preparation method and application thereof. The heat-insulating coating comprises a component A comprising hollow glass beads, titanium dioxide, an expandable microsphere foaming agent, an organic silicon concentrated defoaming agent, an inorganic anti-settling agent, a leveling agent, a solvent and epoxy resin and a component B comprising biuret and butyl acetate. The coating is applied to the outer surface of high-temperature equipment to be used as a heat-preservation and heat-insulation coating, so that the heat radiation and heat loss can be effectively inhibited, and the heat-insulation efficiency can reach more than 68%. The hollow glass beads can form a gas layer with heat blocking effect in the coating, and a heat bridge is blocked, so that the coating has good heat insulation effect. However, the coating has a single heat insulation mode, the surface layer hollow glass is slightly easy to wear, the coating does not have barrier property after being broken, a corrosion channel is easy to be caused after being worn, and the corrosion resistance and the weather resistance are reduced.

Chinese patent CN 103666147A discloses a reflective radiation barrier type exterior wall heat insulation coating. On the basis of the reflective heat-insulating coating and the barrier heat-insulating coating, the heat-insulating coating uniformly disperses all fillers in a water-based binder by preferably selecting high-reflectivity fillers, hollow heat-insulating fillers and heat-radiating fillers and controlling the particle size of the fillers, and simultaneously aims to reduce the damage of the external wall heat-insulating coating to a coating film due to environmental factors such as sunlight irradiation and the like in the using process. The titanium dioxide and the hollow glass beads are used as main light reflection fillers, the organic resin expanded beads are used as blocking fillers, and the rare earth element oxide and the paraffin micro powder are used as heat radiation fillers, so that the fusion of three heat insulation modes is realized, the coating can play a heat insulation effect under various environmental conditions, and the heat insulation effect is obvious. However, the coating adopts three heat insulation modes, but three different heat insulation powder materials are mixed together, so that the utilization rate of the powder materials is low.

Chinese patent CN 104194458A discloses a phase-change type reflective heat-insulating coating and a preparation method thereof. The invention provides a phase-change reflective heat-insulating coating, which takes emulsion, water, titanium dioxide, phase-change microcapsules, heat-insulating powder, heavy calcium powder, kaolin and an auxiliary agent as main materials. The prepared coating is fused with a phase-change microcapsule material, so that the day and night temperature difference of the coating in use is reduced, and the reduction of the heat insulation property of the coating caused by overlarge surface temperature difference is avoided; and secondly, three modes of surface heat reflection, internal heat absorption and heat blocking are combined, so that the heat insulation efficiency is improved, and the heat insulation effect is improved by more than 50% compared with that of the common heat insulation coating under the same thickness. However, although the coating utilizes surface reflection heat, internal absorption heat and barrier heat, the reflection filler and the barrier filler are distributed on the surface and inside of the coating, which causes waste, and the microcapsule preparation process is complex and is not suitable for industrialization.

Disclosure of Invention

In order to solve the problem that the heat insulation effect of the existing heat insulation coating is reduced due to the composition of heat insulation filler and the distribution of the heat insulation filler in a coating, the invention provides a heat insulation radiation-proof coating, which comprises a component A and a component B, wherein the component A comprises:

the coating comprises a resin matrix A, a resin matrix B, a coupling agent, a dispersing agent, a defoaming agent, a solvent, a pigment filler, an infrared reflection filler, a heat insulation filler and a thixotropic agent;

wherein the resin matrix A is fluorine-containing acrylic resin;

the resin matrix B is hydroxyl acrylic resin;

the component B comprises: a curing agent and a solvent;

the curing agent is an isocyanate curing agent;

the resin matrix A: the proportion of the resin matrix B to the heat insulation filler is 10-20: 15-30: 10 to 20.

Preferably, the solid content of the resin matrix A is 60-80%, and the hydroxyl content is 2.0-4.5%.

Preferably, the solid content of the resin matrix B is 60-80%, and the hydroxyl content is 2.0-4.5%.

Preferably, the heat insulation filler consists of an inner layer and an outer layer, the inner layer is hollow microspheres, and the outer layer comprises titanium dioxide and silicon dioxide.

Preferably, the outer layer of the insulating filler also contains carbon.

According to the technical scheme, further, the preparation method of the heat insulation filler comprises the following steps:

adding the hollow microspheres into deionized water, and adjusting the pH value to 2-4;

dropwise adding an ethanol solution of titanium salt and ethyl silicate under the condition of stirring at 60-80 ℃;

and after the dropwise addition, filtering, washing with water to be neutral, drying and calcining to obtain the heat-insulating filler.

Preferably, the titanium salts include titanium sulfate and titanium tetrachloride.

Preferably, the hollow microspheres are one or more of hollow glass microspheres, hollow floating beads, hollow ceramic microspheres, hollow silicon oxide microspheres and hollow aluminum oxide microspheres.

Preferably, the particle size of the heat insulation filler is 800-1250 meshes.

According to the technical scheme, the component A comprises the following components in parts by weight:

the component B comprises, by mass, 70-90 parts of an isocyanate curing agent and 10-30 parts of a solvent.

Preferably, the coupling agent is one or more of KH550, KH560, KH570 and NDZ 101.

Preferably, the dispersing agent is one or a mixture of BYK110, BYK-220S, BYK-163 and Youkai 710S.

Preferably, the defoaming agent is a silicone-based defoaming agent.

Preferably, the defoaming agent is one or a mixture of BYK-530, BYK-066N, EFKA-2040, Yoka chemical 272s and Yoka chemical 245 s.

Preferably, the solvent is one or more of xylene, butyl acetate and propylene glycol methyl ether acetate.

Preferably, the pigment and filler is one or a mixture of more of titanium dioxide, talcum powder, precipitated barium sulfate, barite powder, mica powder and kaolin.

Preferably, the particle size of the pigment and filler is 800-1250 meshes.

Preferably, the infrared reflection filler is one or a mixture of indium tin oxide, zinc aluminum oxide and tin antimony oxide.

Preferably, the infrared reflective filler has a particle size of 1250 mesh.

According to the technical scheme, further, the thixotropic agent is one or a mixture of organic bentonite, polyamide wax and fumed silica.

The invention also provides a preparation method of the heat-insulating radiation-proof coating, which comprises the following steps:

the preparation method of the component A comprises the following steps:

adding the resin matrix A, the infrared reflection filler, the coupling agent and the solvent into a dispersion cylinder, and dispersing for 20-40 min at 1000rpm to obtain a mixture A;

adding the resin matrix B, the heat insulation filler, the coupling agent and the solvent into another dispersion cylinder, and dispersing for 20-40 min at 1000rpm to obtain a mixture B;

mixing the mixture A and the mixture B, adding the pigment and filler, the dispersing agent and the defoaming agent, dispersing for 1-2 h at 1500-3000 rpm, and then adding a thixotropic agent for dispersing for 10 min; obtaining the component A; the coupling agents used in the preparation of the mixture A and the mixture B are the same in kind; the mass part of the coupling agent in the mixture A accounts for half of the mass part of the coupling agent in the component A; the mass part of the solvent in the mixture A accounts for half of the mass part of the solvent in the component A;

the preparation method of the component B comprises the following steps:

adding the curing agent and the solvent into a dispersion cylinder at the rotating speed of 1000rpm, and dispersing for 10-30 min to obtain the component B;

the solvent used for preparing the component A and the component B is the same.

Preferably, in the preparation method of the heat-insulating radiation-proof coating, the preparation method of the heat-insulating filler is as follows:

Preferably, the hollow microspheres are one or a mixture of more of hollow glass microspheres, hollow floating beads, hollow ceramic microspheres, hollow silica microspheres and hollow alumina microspheres.

Preferably, the grain size of the filler in the heat insulation filler is 800-1250 meshes.

According to the thermal insulation coating provided by the invention, the fluorine-containing acrylic resin and the infrared reflection filler are connected through the coupling agent, and a corresponding preparation process is designed, so that during film formation, the fluorine-containing acrylic resin moves upwards due to surface tension, the infrared reflection filler is brought into the surface and distributed on the surface, infrared rays can be effectively reduced from entering the coating, and waste caused by internal distribution of the infrared reflection filler is avoided. Meanwhile, hydroxyl in the fluorine-containing acrylic resin is crosslinked with a curing agent, and after the acrylate part and the hydroxyl part are matched with the used hydroxyl acrylic resin in a corresponding proportion, the fluorine-containing acrylic resin has good compatibility, and the corrosion resistance is prevented from being reduced due to layering.

The heat-insulating filler and the resin matrix B are connected according to a specific proportion through the coupling agent and distributed in the coating, so that the heat-insulating filler hollow microspheres are prevented from floating upwards, are easy to wear and generate corrosion channels, and the corrosion resistance period and the weather resistance of the coating are prolonged.

In the preferred embodiment provided by the invention, the hollow microspheres obtained by the specific scheme of the invention are covered with the radiation material to form a whole, when the external environment temperature is low, infrared rays absorbed by the radiation material can be radiated into the surrounding coating in a heat energy mode, the radiation entering the coating is increased, and the internal temperature of the coating is ensured. When the external environment temperature is higher, the radiation absorbed by the radiation material is increased, the heat insulation efficiency is increased, and the temperature in the coating is also stabilized. And the design also avoids the hollow microspheres from being distributed on the surface, is not beneficial to heat preservation at low temperature, and prevents the coating from expanding with heat and contracting with cold, the adhesive force with the base material is weakened, and the corrosion resistance is reduced.

According to the invention, the infrared reflection filler, the heat insulation filler (namely, the hollow microspheres covered with the radiation material are used in the invention, and have the functions of radiation at low temperature and radiation absorption at high temperature) and the resin are connected through the coupling agent, so that the distribution of the filler in the coating is controlled, and the prepared coating has high hemispherical emissivity and high solar reflectance; the coating has good heat-insulating property, corrosion resistance, artificial aging resistance and weather resistance.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention provides the following examples and comparative examples

TABLE 1 compositions of examples and comparative examples

Remarks are as follows: comparative example 5 differs from example 1 only in the method of preparation of the A component.

In example 1 above:

the resin matrix A is fluorine-containing acrylic resin, the solid content is 70%, and the hydroxyl content is 2.7%;

the resin matrix B is hydroxy acrylic resin, the solid content is 80 percent, and the hydroxyl content is 2.3 percent;

the coupling agent adopts KH 560; the dispersant adopts BYK 110; the antifoaming agent adopts Youkai chemical 245 s; the solvent is a mixture of xylene, butyl acetate and propylene glycol monomethyl ether acetate; the pigment and filler adopt titanium dioxide, talcum powder and precipitated barium sulfate, and the particle size is 800 meshes; the thixotropic agent adopts organic bentonite;

the infrared reflection filler adopts zinc aluminum oxide, and the grain size is 1250 meshes;

the heat insulation filler consists of an inner layer and an outer layer, wherein the inner layer is hollow glass beads, the outer layer comprises titanium dioxide, silicon dioxide and carbon, and the preparation method comprises the following steps: adding hollow glass beads into deionized water, adjusting the pH value to 2, dropwise adding an ethanol solution of titanium sulfate and ethyl silicate under the condition of stirring at 60 ℃, filtering after dropwise adding, washing to be neutral, drying, and calcining to obtain a heat insulation filler;

the curing agent adopts isocyanate curing agent.

The preparation method of the component A comprises the following steps:

adding the resin matrix A, the infrared reflection filler, the coupling agent and the solvent into a dispersion cylinder, and dispersing for 20min at 1000rpm to obtain a mixture A;

adding the resin matrix B, the heat insulation filler, the coupling agent and the solvent into another dispersion cylinder, and dispersing for 20min at 1000rpm to obtain a mixture B;

mixing the mixture A and the mixture B, adding the pigment and filler, the dispersing agent and the defoaming agent, dispersing for 2 hours at 1500rpm, and then adding a thixotropic agent for dispersing for 10 min; obtaining the component A; the coupling agents used in the preparation of the mixture A and the mixture B are the same in kind; the mass part of the coupling agent in the mixture A accounts for half of the mass part of the coupling agent in the component A; the mass part of the solvent in the mixture A accounts for half of the mass part of the solvent in the component A;

the preparation method of the component B comprises the following steps:

adding the curing agent and the solvent into a dispersion cylinder at the rotating speed of 1000rpm, and dispersing for 10min to obtain the component B;

the solvent used for preparing the component A and the component B is the same.

In example 2:

the coupling agent adopts KH 560; the dispersant adopts BYK 110; the antifoaming agent adopts Youkai chemical 245 s; the solvent is a mixture of xylene, butyl acetate and propylene glycol monomethyl ether acetate; the pigment and filler adopts titanium dioxide, talcum powder, precipitated barium sulfate and mica powder, and the particle size is 800 meshes; the thixotropic agent is polyamide wax;

the heat insulation filler consists of an inner layer and an outer layer, wherein the inner layer is hollow glass beads, the outer layer comprises titanium dioxide, silicon dioxide and carbon, and the preparation method comprises the following steps: adding hollow glass beads into deionized water, adjusting the pH value to 3, dropwise adding an ethanol solution of titanium tetrachloride and ethyl silicate under the conditions of stirring and 70 ℃, filtering after dropwise adding, washing to be neutral, drying, and calcining to obtain a heat insulation filler;

the curing agent adopts isocyanate curing agent.

The preparation method of the component A comprises the following steps:

adding the resin matrix A, the infrared reflection filler, the coupling agent and the solvent into a dispersion cylinder, and dispersing for 30min at 1000rpm to obtain a mixture A;

adding the resin matrix B, the heat insulation filler, the coupling agent and the solvent into another dispersion cylinder, and dispersing for 30min at 1000rpm to obtain a mixture B;

mixing the mixture A and the mixture B, adding the pigment and filler, the dispersing agent and the defoaming agent, dispersing for 1.5h at 2000rpm, and then adding a thixotropic agent for dispersing for 10 min; obtaining the component A; the coupling agents used in the preparation of the mixture A and the mixture B are the same in kind; the mass part of the coupling agent in the mixture A accounts for half of the mass part of the coupling agent in the component A; the mass part of the solvent in the mixture A accounts for half of the mass part of the solvent in the component A;

the preparation method of the component B comprises the following steps:

adding the curing agent and the solvent into a dispersion cylinder at the rotating speed of 1000rpm, and dispersing for 20min to obtain the component B;

the solvent used for preparing the component A and the component B is the same.

In example 3:

the coupling agent adopts KH 560; the dispersant adopts BYK 110; the antifoaming agent adopts Youkai chemical 245 s; the solvent is a mixture of xylene, butyl acetate and propylene glycol monomethyl ether acetate; the pigment and filler adopts titanium dioxide, talcum powder and mica powder, and the particle size is 800 meshes; the thixotropic agent adopts fumed silica;

the heat insulation filler consists of an inner layer and an outer layer, wherein the inner layer is hollow glass beads, the outer layer comprises titanium dioxide, silicon dioxide and carbon, and the preparation method comprises the following steps: adding hollow glass beads into deionized water, adjusting the pH value to be 4, dropwise adding an ethanol solution of titanium sulfate and ethyl silicate under the condition of stirring at 80 ℃, filtering after dropwise adding, washing to be neutral, drying, and calcining to obtain a heat insulation filler;

the curing agent adopts isocyanate curing agent.

The preparation method of the component A comprises the following steps:

adding the resin matrix A, the infrared reflection filler, the coupling agent and the solvent into a dispersion cylinder, and dispersing for 40min at 1000rpm to obtain a mixture A;

adding the resin matrix B, the heat insulation filler, the coupling agent and the solvent into another dispersion cylinder, and dispersing for 40min at 1000rpm to obtain a mixture B;

mixing the mixture A and the mixture B, adding the pigment and filler, the dispersing agent and the defoaming agent, dispersing for 1h at 3000rpm, and then adding a thixotropic agent for dispersing for 10 min; obtaining the component A; the coupling agents used in the preparation of the mixture A and the mixture B are the same in kind; the mass part of the coupling agent in the mixture A accounts for half of the mass part of the coupling agent in the component A; the mass part of the solvent in the mixture A accounts for half of the mass part of the solvent in the component A;

the preparation method of the component B comprises the following steps:

adding the curing agent and the solvent into a dispersion cylinder at the rotating speed of 1000rpm, and dispersing for 30min to obtain the component B;

the solvent used for preparing the component A and the component B is the same.

In example 4:

the resin matrix A is fluorine-containing acrylic resin, the solid content is 80%, and the hydroxyl content is 2.0%;

the resin matrix B is hydroxy acrylic resin, the solid content is 60 percent, and the hydroxyl content is 4.5 percent;

NDZ101 is adopted as a coupling agent, and Youkai 710s is adopted as a dispersing agent; the defoaming agent adopts BYK-530; the solvent is a mixture of dimethylbenzene and butyl acetate; the pigment and filler adopts titanium dioxide, talcum powder, precipitated barium sulfate and mica powder, and the particle size is 800 meshes; the thixotropic agent adopts organic bentonite;

the infrared reflection filler adopts indium tin oxide, and the grain size is 1250 meshes;

the heat insulation filler consists of an inner layer and an outer layer, the inner layer is hollow ceramic microspheres, the outer layer comprises titanium dioxide and silicon dioxide, and the preparation method comprises the following steps: adding hollow ceramic microspheres into deionized water, adjusting the pH value to 2.5, dropwise adding an ethanol solution of titanium tetrachloride and ethyl silicate under the conditions of stirring and 75 ℃, filtering after dropwise addition, washing with water to be neutral, drying, and calcining to obtain a heat insulation filler;

the curing agent adopts isocyanate curing agent.

The preparation method of the component A comprises the following steps:

adding the resin matrix A, the infrared reflection filler, the coupling agent and the solvent into a dispersion cylinder, and dispersing for 25min at 1000rpm to obtain a mixture A;

adding the resin matrix B, the heat insulation filler, the coupling agent and the solvent into another dispersion cylinder, and dispersing for 25min at 1000rpm to obtain a mixture B;

the preparation method of the component B comprises the following steps:

the solvent used for preparing the component A and the component B is the same.

In example 5:

the resin matrix A is fluorine-containing acrylic resin, the solid content is 60 percent, and the hydroxyl content is 4.5 percent;

the resin matrix B is hydroxy acrylic resin, the solid content is 70 percent, and the hydroxyl content is 2.0 percent;

the coupling agent adopts KH 550; the dispersant adopts BYK-163; the defoaming agent adopts EFKA-2040; the solvent is propylene glycol methyl ether acetate; the pigment and filler adopt precipitated barium sulfate, barite powder and kaolin, and the particle size is 800 meshes; the thixotropic agent is polyamide wax;

the infrared reflection filler adopts tin antimony oxide, and the grain size is 1250 meshes;

the heat insulation filler consists of an inner layer and an outer layer, the inner layer is hollow silica micro beads, the outer layer comprises titanium dioxide, silicon dioxide and carbon, and the preparation method comprises the following steps: adding hollow silica microspheres into deionized water, adjusting the pH value to 3, dropwise adding an ethanol solution of titanium sulfate and ethyl silicate under the conditions of stirring and 80 ℃, filtering after dropwise adding, washing to be neutral, drying, and calcining to obtain a heat insulation filler;

the curing agent adopts isocyanate curing agent.

The preparation method of the component A comprises the following steps:

the preparation method of the component B comprises the following steps:

the solvent used for preparing the component A and the component B is the same.

Comparative example 1 the specific raw materials used, with the exception of the resin matrix a, were the same as in example 1, and the preparation method was the same as in example 1.

Comparative example 2 the specific raw materials used, except for the insulating filler, were the same as in example 2, and the preparation method was the same as in example 2.

Comparative example 3 the specific raw materials used, except for the infrared reflective filler, were the same as in example 3 and the preparation method was the same as in example 3.

Comparative example 4 the specific raw materials used were the same as in example 1 except that hollow glass beads were used instead of the heat insulating filler, and the preparation method was the same as in example 1.

Comparative example 5 the specific starting materials used were the same as in example 1 except that the method of preparation of the A component was different from that of example 1.

Comparative example 5 a component was prepared as follows:

adding a resin matrix A, an infrared reflection filler, a coupling agent and a solvent into a dispersion cylinder, dispersing a resin matrix B, a heat insulation filler for 20min at 1000rpm, then adding a pigment filler, the dispersing agent and a defoaming agent, dispersing for 2h at 1500rpm, and then adding a thixotropic agent for dispersing for 10 min; thus obtaining the component A;

comparative example 5 a component b was prepared in the same manner as in example 1.

Comparative example 6 compared with example 1, the solvent content increased without adding a coupling agent, and the specific raw materials used were the same as in example 1, and the preparation method was the same as in example 1.

In examples 1, 2, 3, 4 and 5, the component A and the component B are respectively mixed according to the weight ratio of 7.5: 1 (mass ratio), 8: 1 (mass ratio), 8.5: 1 (mass ratio), 7.2: 1 (mass ratio), 8: 1 (mass ratio), in comparative examples 1, 2 and 3, the ratio of the component A to the component B was 7.5: 1 (mass ratio), 8: 1 (mass ratio), 8.5: 1 (mass ratio), the component a and the component b of comparative example 4 were mixed in a ratio of 7.5: 1 (mass ratio), the component a and the component b of comparative example 5 were mixed in a ratio of 7.5: 1 (mass ratio), the component a and the component b of comparative example 6 were mixed in a ratio of 7.5: 1 (mass ratio), spraying paint to obtain a coating, and testing according to indexes shown in the following table:

TABLE 2 Main technical indexes of heat-insulating radiation-proof paint

The test results are shown in the following table:

TABLE 3 example and comparative example Performance data

Comparative example 1 compared with example 1, without the resin matrix a, comparative example 5 compared with example 1, the a component was prepared differently, both the infrared reflective filler and the thermal insulation filler were randomly distributed in the coating, it was observed that the hemispherical emissivity and the solar reflectance were decreased, and the thermal insulation filler was unevenly distributed in the coating due to the infrared reflective filler, resulting in a decrease in the thermal insulation property of the coating, which in turn resulted in an increase in the decomposition rate of the coating resin, resulting in a decrease in the artificial aging resistance, the insolation resistance, the adhesion and the salt fog resistance.

Compared with the example 2, only the infrared reflective filler is used, the thermal insulation filler is not used, the hemispherical emissivity is obviously reduced, compared with the example 4, the thermal insulation filler in the example 1 is replaced by the hollow glass beads, the thermal insulation efficiency is low at higher temperature, the artificial aging resistance is caused, the insolation resistance is obviously reduced, the day and night temperature difference of an insolation test is larger, the surface of the hollow glass beads is not covered by the radiation material, the internal temperature change of the coating is larger, and the thermal expansion coefficient of the coating is inconsistent with that of the base material, so that the adhesion is reduced, and the coating is separated from the base material.

Compared with the example 3, the comparative example 3 only has the heat insulation filler and no infrared reflection filler, the solar reflectance is reduced, the solar energy is absorbed more, and the artificial aging resistance, the adhesive force and the salt fog resistance are reduced.

Comparative example 6 compared with example 1, without coupling agent, the heat insulating filler and the infrared reflective filler are not tightly combined with the resin, resulting in low order of distribution of the two fillers during preparation, resulting in reduced heat insulating property of the coating, reduced artificial aging resistance, reduced insolation resistance, reduced adhesion and salt fog resistance.

Although terms such as resin matrix a, resin matrix B, coupling agent, dispersant, defoamer, solvent, pigment filler, infrared reflective filler, thermal insulating filler, thixotropic agent, isocyanate curing agent, solvent, fluorine-containing acrylic resin, hydroxyacrylic resin … …, etc., are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat-insulating radiation-proof coating is characterized in that: the composition comprises a component A and a component B, wherein the component A comprises: the coating comprises a resin matrix A, a resin matrix B, a coupling agent, a dispersing agent, a defoaming agent, a solvent, a pigment filler, an infrared reflection filler, a heat insulation filler and a thixotropic agent; wherein the resin matrix A is fluorine-containing acrylic resin; the resin matrix B is hydroxyl acrylic resin; the component B comprises: a curing agent and a solvent; the curing agent is an isocyanate curing agent; the proportion of the resin matrix A, the resin matrix B and the heat insulation filler is 10-20: 15-30: 10-20; the heat insulation filler consists of an inner layer and an outer layer, wherein the inner layer is hollow microspheres, and the outer layer comprises titanium dioxide and silicon dioxide; the infrared reflection filler is one or more of indium tin oxide, zinc aluminum oxide and tin antimony oxide;

the preparation method of the heat insulation filler comprises the following steps:

after the dropwise addition, filtering, washing with water to be neutral, drying and calcining to obtain the heat insulation filler;

the hollow microspheres are one or more of hollow glass microspheres, hollow floating beads, hollow ceramic microspheres, hollow silicon oxide microspheres and hollow aluminum oxide microspheres;

the component A comprises the following components in parts by weight:

the component B comprises 70-90 parts by mass of an isocyanate curing agent and 10-30 parts by mass of a solvent;

the coating is prepared by the following method:

the preparation method of the component A comprises the following steps: adding the resin matrix A, the infrared reflection filler, the coupling agent and the solvent into a dispersion cylinder, and dispersing for 20-40 min at 1000rpm to obtain a mixture A; adding the resin matrix B, the heat insulation filler, the coupling agent and the solvent into another dispersion cylinder, and dispersing for 20-40 min at 1000rpm to obtain a mixture B; mixing the mixture A and the mixture B, adding the pigment and filler, the dispersing agent and the defoaming agent, dispersing for 1-2 h at 1500-3000 rpm, and then adding the thixotropic agent for dispersing for 10 min; obtaining the component A; the preparation method of the component B comprises the following steps: and adding the curing agent and the solvent into a dispersion cylinder at the rotating speed of 1000rpm, and dispersing for 10-30 min to obtain the component B.

2. The thermal insulation radiation protection coating of claim 1, characterized in that: the defoaming agent is an organic silicon defoaming agent; the pigment and filler is one or more of titanium dioxide, talcum powder, precipitated barium sulfate, barite powder, mica powder and kaolin.

3. The thermal insulation radiation protection coating of claim 1, characterized in that: the solvent is one or more of dimethylbenzene, butyl acetate and propylene glycol methyl ether acetate.

4. The preparation method of the thermal insulation radiation protection paint according to any one of claims 1 to 3, characterized in that:

5. The preparation method of the heat-insulating radiation-proof coating as claimed in claim 4, characterized in that: the preparation method of the heat insulation filler comprises the following steps: