CN114196308B - Ultrathin anti-radiation heat-insulating coating and preparation method thereof - Google Patents

Abstract

The invention discloses an ultrathin radiation-resistant heat-insulating coating and a preparation method thereof, wherein the coating comprises the following raw materials: self-made modified water-based acrylic resin, a water-based dispersing agent, a defoaming agent, a wetting agent, aluminum powder slurry, mica powder, ceramic micro-beads, aluminum silicate short fibers, a curing agent and the like; the ultrathin radiation-resistant heat-insulating coating disclosed by the invention takes water as a diluent, is energy-saving and environment-friendly, is non-combustible and non-explosive, adopts a two-component waterborne polyurethane system, is high in coating hardness and good in water resistance, and has excellent weather resistance, and excellent binding force with epoxy primer, polyurethane finish, fluorocarbon finish and the like. The ultrathin radiation-resistant heat-insulating coating has the outstanding advantages of blocking solar radiation, reflecting solar infrared and visible light radiation, better blocking heat conduction of the coating, convenient construction, no need of special spraying equipment, simple construction process, lower requirement on constructors and easy realization of automatic construction.

Description

Ultrathin anti-radiation heat-insulating coating and preparation method thereof

Technical Field

The invention relates to the technical field of special coatings, in particular to an ultrathin radiation-resistant heat-insulating coating and a preparation method thereof.

Background

The heat insulation coating is widely applied to multiple fields of industry, building, transportation and the like, and in some special operating environments, the heat insulation coating can play a role in decoration and marking and also can play a role in protection, but the conventional heat insulation coating generally takes thick coating as a main material, a filler system of the conventional heat insulation coating generally adopts hollow microspheres, ceramic microspheres, expanded perlite, expanded vermiculite and the like with low heat conductivity coefficient as main heat insulation fillers, the heat insulation effect is limited, the mechanical property of a coating is poor, and the coating is easy to peel and fall off, so that the requirements of people on the heat insulation coating cannot be met only by simply selecting the conventional heat insulation filler without modifying and designing a resin base material.

On the other hand, except for the heat insulation materials required in buildings, tank cars, storage tanks and the like for liquid transportation are affected by solar radiation for a long time in the transportation process in summer, so that the temperature rises sharply, and the transportation safety is affected.

In conclusion, the development of ultra-thin heat-insulating coating with good radiation resistance is urgently needed.

Disclosure of Invention

In order to solve the problems, the invention aims to provide an ultrathin radiation-resistant heat-insulating coating and a preparation method thereof.

In order to achieve the purpose, the invention is realized by the following technical scheme:

an ultra-thin type anti-radiation heat-insulating coating comprises the following raw materials in parts by weight: 350-450 parts of modified waterborne acrylic resin, 1-5 parts of waterborne dispersant, 1-3 parts of defoamer, 1-5 parts of wetting agent, 5-20 parts of aluminum powder slurry, 30-70 parts of mica powder, 50-100 parts of ceramic micro-beads, 30-80 parts of aluminum silicate short fibers, 2-10 parts of fumed silica, 1-5 parts of ultraviolet absorber, 20-50 parts of far infrared powder, 30-70 parts of nano titanium dioxide, 60-120 parts of curing agent and 200-300 parts of deionized water;

the modified water-based acrylic resin is prepared by the following steps:

(1) adding 2-5 parts by weight of ethylene glycol butyl ether and 3-5 parts by weight of dodecanethiol into a reaction kettle, and uniformly stirring at 50-80 ℃ to obtain a solvent for later use;

(2) mixing 1-3 parts of monomethyl trichlorosilane and 4-8 parts of diphenyl dichlorosilane, adding the mixture into 8-12 parts of deionized water for hydrolysis reaction for several times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 60-65 parts of water for dilution and settling, discharging water for washing, repeating the steps for 5-6 times, and determining the pH value to be neutral (the pH value is 6.5-7) to obtain a silanol hydrolysate for later use;

(3) uniformly mixing 8-13 parts of acrylic acid, 6-7 parts of hydroxyethyl methacrylate, 5-16 parts of methyl methacrylate, 8-13 parts of butyl acrylate, 0.3-0.6 part of dibenzoyl peroxide and 1.5-3 parts of silane hydrolysate obtained in the step (2) to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting at 50-80 ℃ for 1.5-3 hours after finishing dripping;

(4) after the reaction is finished, 2-5 parts of dimethylethanolamine and 45-70 parts of deionized water are added into the mixture, and then the mixture is filtered and packaged to obtain the modified water-based acrylic resin.

Preferably, in the step (4), the solid content of the modified waterborne acrylic resin is 42-48% by using the deionized water.

Preferably, the particle size of the mica powder is 200-300 meshes, and the mica powder is pretreated by the following steps:

putting mica powder into a drying oven to be dried for 1-2 hours at the temperature of 60-70 ℃, then adding the mica powder into a mixer, adding NP-10 aqueous solution with the mass concentration of 8-12% while stirring, adding methyl potassium silicate aqueous solution with the mass concentration of 28-32% after fully and uniformly mixing, stirring and uniformly mixing, putting the mixture into the drying oven, and drying the mixture at the temperature of 60-70 ℃;

wherein the mass ratio of the mica powder, the NP-10 aqueous solution and the methyl potassium silicate aqueous solution is 90: 8-12: 14-18.

Preferably, the particle size of the aluminum paste is 5-10 μm, and the aluminum paste is obtained by the following steps:

heating aluminum powder to 75-85 ℃, adding stearic acid, uniformly stirring, then adding sodium polyacrylate, uniformly stirring for 1-2 hours, and cooling to 20-30 ℃ to obtain aluminum paste; the molecular weight of the sodium polyacrylate is 2000-4000;

wherein the mass ratio of the aluminum powder, the stearic acid and the sodium polyacrylate is 100: 1-3: 1-5.

Preferably, the aluminum silicate short fibers have a fiber length of 90 to 150 μm.

Preferably, the ceramic microspheres are ceramic hollow microspheres with the particle size of 100-150 mu m.

Preferably, the ultraviolet light absorber is phenyl o-hydroxybenzoate, resorcinol monobenzoate, 2, 4-dihydroxybenzophenone or 2-hydroxy-4-methoxybenzophenone; the far infrared powder is tourmaline far infrared functional powder; the curing agent is hexamethylene diisocyanate.

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

adding 200-300 parts of deionized water into a mixing tank, sequentially adding 1-5 parts of water-based dispersant, 1-3 parts of defoaming agent and 1-5 parts of wetting agent under stirring, stirring for 15-20 minutes, then sequentially adding 30-70 parts of mica powder, 30-80 parts of aluminum silicate short fiber, 2-10 parts of fumed silica, 1-5 parts of ultraviolet absorber, 20-50 parts of far infrared powder and 30-70 parts of nano titanium dioxide, performing high-speed dispersion for at least 30 minutes, performing ball milling to 50 micrometers in fineness, adding 350-450 parts of modified water-based acrylic resin, 5-20 parts of aluminum powder slurry and 50-100 parts of ceramic micro-beads, uniformly dispersing, adding 60-120 parts of curing agent during use, and uniformly dispersing to obtain the ultrathin radiation-resistant heat-insulating coating;

the modified water-based acrylic resin is prepared by the following steps:

(1) adding 2-5 parts by weight of butyl cellosolve and 3-5 parts by weight of dodecanethiol into a reaction kettle, and uniformly stirring at 50-80 ℃ to obtain a solvent for later use;

(2) mixing 1-3 parts of monomethyl trichlorosilane and 4-8 parts of diphenyl dichlorosilane, adding the mixture into 8-12 parts of deionized water for hydrolysis reaction in several times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 60-65 parts of water for dilution and settling, discharging water for washing, repeating the steps for 5-6 times, and determining the neutral pH value to obtain a silanol-forming hydrolysate for later use;

(3) uniformly mixing 8-13 parts of acrylic acid, 6-7 parts of hydroxyethyl methacrylate, 5-16 parts of methyl methacrylate, 8-13 parts of butyl acrylate, 0.3-0.6 part of dibenzoyl peroxide and 1.5-3 parts of silane hydrolysate obtained in the step (2) to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting at 50-80 ℃ for 1.5-3 hours after finishing dripping;

(4) after the reaction is finished, 2-5 parts of dimethylethanolamine and 45-70 parts of deionized water are added into the mixture, and then the mixture is filtered and packaged to obtain the modified water-based acrylic resin.

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

the ultrathin radiation-resistant heat-insulating coating disclosed by the invention takes water as a diluent, is energy-saving and environment-friendly, is non-combustible and non-explosive, adopts a double-component waterborne polyurethane system, has high coating hardness, good water resistance and excellent weather resistance, and has excellent binding force with epoxy primer, polyurethane finish, fluorocarbon finish and the like. The ultrathin anti-radiation heat-insulation coating has the outstanding advantages in the aspect of blocking solar radiation, not only can reflect solar infrared and visible light radiation, but also can better block heat conduction, and in addition, the coating can release absorbed energy at any time in a far infrared mode while insulating heat, so that the heat accumulation is reduced. The coating is convenient to construct, does not need special spraying equipment, has a simple construction process, has low requirement on constructors, and is easy to realize automatic construction.

The ultrathin radiation-resistant heat-insulating coating can achieve a good heat-insulating effect at a thickness of about 0.3mm, has a temperature difference of more than 15 ℃, has excellent physical properties, and far exceeds the existing heat-insulating coating.

Detailed Description

The invention aims to provide an ultrathin radiation-resistant heat-insulating coating and a preparation method thereof, and the ultrathin radiation-resistant heat-insulating coating is realized by the following technical scheme:

monobenzoic acid Resorcinol is distinguished as 1, 3-benzenediol monobenzoate.

The invention is further described with reference to specific examples.

Example 1

An ultra-thin type radiation-resistant heat-insulating coating is composed of the following raw materials: 350kg of modified waterborne acrylic resin, 1kg of waterborne dispersant, 1kg of defoaming agent, 1kg of wetting agent, 5kg of aluminum powder slurry, 30kg of mica powder, 50kg of ceramic micro-beads, 30kg of aluminum silicate short fibers, 2kg of fumed silica, 1kg of ultraviolet light absorbent (phenyl ortho-hydroxybenzoate), 20g of far infrared powder, 30kg of nano titanium dioxide, 60kg of curing agent (hexamethylene diisocyanate) and 200kg of deionized water;

the modified water-based acrylic resin is prepared by the following steps:

(1) adding 10kg of ethylene glycol monobutyl ether and 15kg of dodecanethiol into a reaction kettle, and uniformly stirring at 50-55 ℃ to obtain a solvent for later use;

(2) mixing 1kg of monomethyl trichlorosilane and 4kg of diphenyl dichlorosilane, adding the mixture into 8kg of deionized water for hydrolysis reaction by averagely 10 times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 60kg of water for dilution and settling, discharging washing water, repeating the steps for 5-6 times, and determining the neutral pH value (the pH value range is 6.5-7) to obtain a finished silanol hydrolysate for later use;

(3) uniformly mixing 40kg of acrylic acid, 30kg of hydroxyethyl methacrylate, 25kg of methyl methacrylate, 40kg of butyl acrylate, 7.5kg of silane hydrolysate and 1.5kg of dibenzoyl peroxide to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle not to exceed 80 ℃ in the adding process, and reacting for 1.5 hours at 50 ℃ after dropwise adding;

(4) after the reaction is finished, 10kg of dimethylethanolamine and 225kg of deionized water are added, and then the mixture is filtered and packaged to obtain the modified water-based acrylic resin.

Example 2

An ultra-thin type radiation-resistant heat-insulating coating is composed of the following raw materials: 450kg of modified waterborne acrylic resin, 5kg of waterborne dispersant, 3kg of defoamer, 5kg of wetting agent, 20kg of aluminum powder slurry, 70kg of mica powder, 100kg of ceramic micro-beads, 80kg of aluminum silicate short fiber, 10kg of fumed silica, 5kg of ultraviolet light absorber (resorcinol monobenzoate), 50kg of far infrared powder, 70kg of nano titanium dioxide, 120kg of curing agent (hexamethylene diisocyanate) and 300kg of deionized water;

the modified water-based acrylic resin is prepared by the following steps:

(1) adding 25kg of ethylene glycol monobutyl ether and 25kg of dodecanethiol into a reaction kettle, and uniformly stirring at 75-80 ℃ to obtain a solvent for later use;

(2) mixing 3kg of monomethyl trichlorosilane and 8kg of diphenyl dichlorosilane, adding the mixture into 12kg of deionized water for hydrolysis reaction by 5 times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 65kg of water for dilution and settlement, discharging washing water, repeating the steps for 5-6 times, and measuring the neutral pH value (the pH value range is 6.5-7) to obtain a finished silanol hydrolysate for later use;

(3) uniformly mixing 65kg of acrylic acid, 35kg of hydroxyethyl methacrylate, 80kg of methyl methacrylate, 65kg of butyl acrylate, 15kg of silane hydrolysate and 3kg of dibenzoyl peroxide to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting for 3 hours at 75-80 ℃ after dropwise adding;

(4) after the reaction is finished, 25kg of dimethylethanolamine and 350kg of deionized water are added into the mixture, and then the mixture is filtered and packaged to obtain the modified water-based acrylic resin.

Example 3

An ultra-thin type radiation-resistant heat-insulating coating is composed of the following raw materials: 380kg of modified waterborne acrylic resin, 2kg of waterborne dispersant, 1.5kg of defoamer, 2kg of wetting agent, 8kg of aluminum powder slurry, 34kg of mica powder, 60kg of ceramic micro-beads, 40kg of aluminum silicate short fiber, 4kg of fumed silica, 2kg of ultraviolet light absorber (2, 4-dihydroxybenzophenone), 30kg of far infrared powder, 40kg of nano titanium dioxide, 80kg of curing agent (hexamethylene diisocyanate) and 220kg of deionized water; the fiber length of the aluminum silicate short fibers is 90-100 mu m; the ceramic microspheres are ceramic hollow microspheres with the particle size of 100-110 mu m;

the particle size of the mica powder is 200-300 meshes, and the mica powder is pretreated by the following steps:

putting mica powder into a drying oven, drying for 1 hour at 60 ℃, then adding the mica powder into a mixer, adding NP-10 aqueous solution with the mass concentration of 8% while stirring, adding methyl potassium silicate aqueous solution with the mass concentration of 28% after fully and uniformly mixing, stirring and uniformly mixing, putting into the drying oven, and drying at 60 ℃;

wherein the mass ratio of the mica powder, the NP-10 aqueous solution and the methyl potassium silicate aqueous solution is 90: 12: 18;

the particle size of the aluminum paste is 5-10 mu m, and the aluminum paste is obtained according to the following steps:

heating aluminum powder to 85 ℃, adding stearic acid, uniformly stirring, then adding sodium polyacrylate, uniformly stirring for 2 hours, and cooling to 30 ℃ to obtain aluminum powder slurry; the molecular weight of the sodium polyacrylate is 4000;

wherein the mass ratio of the aluminum powder to the stearic acid to the sodium polyacrylate is 100: 3: 5;

the modified water-based acrylic resin is prepared by the following steps:

(1) adding 15kg of ethylene glycol monobutyl ether and 17.5kg of dodecanethiol into a reaction kettle, and uniformly stirring at 60 ℃ to obtain a solvent for later use;

(2) mixing 1.5kg of monomethyl trichlorosilane and 5kg of diphenyl dichlorosilane, adding the mixture into 10kg of deionized water for hydrolysis reaction for 8 times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 62kg of water for dilution and settling, discharging washing water, repeating the steps for 5-6 times, and determining the neutral pH value (the pH value range is 6.5-7) to obtain the finished silanol hydrolysate for later use;

(3) uniformly mixing 45kg of acrylic acid, 32.5kg of hydroxyethyl methacrylate, 30kg of methyl methacrylate, 45kg of butyl acrylate, 10kg of silane hydrolysate and 2kg of dibenzoyl peroxide to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting for 2 hours at 60-65 ℃ after dropwise adding;

(4) after the reaction is finished, 15kg of dimethylethanolamine and 300kg of deionized water are added to the mixture, the solid content is tested to be 43%, and then the mixture is filtered and packaged to obtain the modified waterborne acrylic resin.

Example 4

An ultrathin radiation-resistant heat-insulating coating is composed of the following raw materials: 420kg of modified waterborne acrylic resin, 4kg of waterborne dispersant, 2.5kg of defoamer, 4kg of wetting agent, 18kg of aluminum powder slurry, 60kg of mica powder, 90kg of ceramic micro-beads, 70kg of aluminum silicate short fiber, 9kg of fumed silica, 4kg of ultraviolet light absorber (2-hydroxy-4-methoxybenzophenone), 40kg of far infrared powder, 65kg of nano titanium dioxide, 100kg of curing agent (hexamethylene diisocyanate) and 275kg of deionized water; the fiber length of the aluminum silicate short fibers is 140-150 mu m; the ceramic microspheres are ceramic hollow microspheres with the particle size of 140-150 mu m;

the particle size of the mica powder is 200-300 meshes, and the mica powder is pretreated by the following steps:

putting mica powder into an oven to be dried for 2 hours at 70 ℃, then adding the mica powder into a mixer, adding NP-10 aqueous solution with the mass concentration of 12% while stirring, adding methyl potassium silicate aqueous solution with the mass concentration of 32% after fully and uniformly mixing, stirring and uniformly mixing, putting into the oven to be dried at 70 ℃;

wherein the mass ratio of the mica powder, the NP-10 aqueous solution and the methyl potassium silicate aqueous solution is 90: 8: 14;

the modified water-based acrylic resin is prepared by the following steps:

(1) adding 20kg of ethylene glycol monobutyl ether and 20kg of dodecanethiol into a reaction kettle, and uniformly stirring at 70 ℃ to obtain a solvent for later use;

(2) mixing 2.5kg of methyl trichlorosilane and 7kg of diphenyl dichlorosilane, adding the mixture into 9kg of deionized water for hydrolysis reaction for 6 times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 61kg of water for dilution and settling, discharging washing water, repeating the steps for 5-6 times, and determining the pH value to be neutral (the pH value range is 6.5-7) to obtain a finished silanol hydrolysate for later use;

(3) uniformly mixing 55kg of acrylic acid, 34kg of hydroxyethyl methacrylate, 70kg of methyl methacrylate, 55kg of butyl acrylate, 12.5kg of silane hydrolysate and 2.5kg of dibenzoyl peroxide to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle not to exceed 80 ℃ in the adding process, and reacting for 2 hours at 70-75 ℃ after dropwise adding;

(4) after the reaction is finished, adding 20kg of dimethylethanolamine and 325kg of deionized water into the mixture, testing the solid content to be 45%, and then filtering and packaging to obtain modified water-based acrylic resin;

the particle size of the aluminum paste is 5-10 mu m, and the aluminum paste is obtained according to the following steps:

heating aluminum powder to 75 ℃, adding stearic acid, uniformly stirring, then adding sodium polyacrylate, uniformly stirring for 1 hour, and cooling to 20-30 ℃ to obtain aluminum powder slurry; the molecular weight of the sodium polyacrylate is 2000; wherein the mass ratio of the aluminum powder, the stearic acid and the sodium polyacrylate is 100: 1.

Example 5

An ultra-thin type radiation-resistant heat-insulating coating is composed of the following raw materials: 400kg of modified waterborne acrylic resin, 3kg of waterborne dispersant, 2kg of defoamer, 3kg of wetting agent, 12kg of aluminum powder slurry, 50kg of mica powder, 75kg of ceramic micro-beads, 50kg of aluminum silicate short fiber, 6kg of fumed silica, 3kg of ultraviolet light absorber (2-hydroxy-4-methoxybenzophenone), 30kg of far infrared powder, 50kg of nano titanium dioxide, 90kg of curing agent (hexamethylene diisocyanate) and 250kg of deionized water; the fiber length of the aluminum silicate short fiber is 120-130 mu m; the ceramic microspheres are ceramic hollow microspheres with the particle size of 120-130 mu m;

the particle size of the mica powder is 200-300 meshes, and the mica powder is pretreated by the following steps:

putting mica powder into an oven to be dried for 1.5 hours at 65 ℃, then adding the mica powder into a mixer, adding NP-10 aqueous solution with the mass concentration of 10% while stirring, adding methyl potassium silicate aqueous solution with the mass concentration of 30% after fully and uniformly mixing, stirring and uniformly mixing, putting into the oven to be dried at 65 ℃;

wherein the mass ratio of the mica powder to the NP-10 aqueous solution to the methyl potassium silicate aqueous solution is 90: 10: 15;

the particle size of the aluminum paste is 5-10 mu m, and the aluminum paste is obtained according to the following steps:

heating aluminum powder to 85 ℃, adding stearic acid, uniformly stirring, then adding sodium polyacrylate, uniformly stirring for 2 hours, and cooling to 30 ℃ to obtain aluminum powder slurry; the molecular weight of the sodium polyacrylate is 4000;

wherein the mass ratio of the aluminum powder, the stearic acid and the sodium polyacrylate is 50: 1: 2;

the modified waterborne acrylic resin is prepared by the following steps:

(1) adding 15kg of ethylene glycol monobutyl ether and 20kg of dodecanethiol into a reaction kettle, and uniformly stirring at 60 ℃ to obtain a solvent for later use;

(2) mixing 2kg of monomethyl trichlorosilane and 6kg of diphenyl dichlorosilane, adding the mixture into 10kg of deionized water for hydrolysis reaction for several times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 62kg of water for dilution and settlement, discharging water for washing, repeating the steps for 5-6 times, and measuring the neutral pH value (the pH value range is 6.5-7) to obtain the finished silanol hydrolysate for later use;

(3) uniformly mixing 50kg of acrylic acid, 32.5kg of hydroxyethyl methacrylate, 50kg of methyl methacrylate, 50kg of butyl acrylate, 10kg of silane hydrolysate and 2kg of dibenzoyl peroxide to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting for 2 hours at 60 ℃ after dropwise adding is finished;

(4) after the reaction is finished, 20kg of dimethylethanolamine and 300kg of deionized water are added into the mixture, the test solid content is 44%, and then the mixture is filtered and packaged to obtain the modified water-based acrylic resin.

Example 6

The preparation method of the ultrathin radiation-resistant heat-insulating coating in the embodiment 1 comprises the following steps:

200kg of deionized water is added into a mixing tank, 1kg of aqueous dispersant, 1kg of defoaming agent and 1kg of wetting agent are sequentially added under stirring and stirred for 15 minutes, then 30kg of mica powder, 30kg of aluminum silicate short fiber, 2kg of fumed silica, 1kg of ultraviolet light absorbent (phenyl ortho-hydroxybenzoate), 20g of far infrared powder and 30kg of nano titanium dioxide are sequentially added, high-speed dispersion is carried out for 35 minutes, then ball milling is carried out until the fineness is 50 micrometers, 350kg of modified aqueous acrylic resin, 5kg of aluminum powder slurry and 50kg of ceramic micro-beads are added, and the mixture is uniformly dispersed, when in use, 60kg of curing agent (hexamethylene diisocyanate) is added, and the ultra-thin radiation-resistant heat-insulating coating is obtained.

Example 7

The preparation method of the ultrathin radiation-resistant heat-insulating coating in the embodiment 2 comprises the following steps:

adding 300kg of deionized water into a material mixing tank, sequentially adding 5kg of aqueous dispersant, 3kg of defoaming agent and 5kg of wetting agent under stirring, stirring for 15-20 minutes, then sequentially adding 70kg of mica powder, 80kg of aluminum silicate short fiber, 10kg of fumed silica, 5kg of ultraviolet light absorbent (resorcinol monobenzoate), 50kg of far infrared powder and 70kg of nano titanium dioxide, performing high-speed dispersion for 30 minutes, then performing ball milling until the fineness is 50 micrometers, adding 350-450 parts of modified aqueous acrylic resin, uniformly dispersing 20kg of aluminum powder slurry and 100kg of ceramic microspheres, and adding 120kg of curing agent (hexamethylene diisocyanate) to uniformly disperse when in use, thereby obtaining the ultrathin radiation-resistant heat-insulating coating.

Example 8

The preparation method of the ultrathin radiation-resistant heat-insulating coating in the embodiment 3 comprises the following steps:

220kg of deionized water is added into a material mixing tank, 2kg of aqueous dispersant, 1.5kg of defoamer and 2kg of wetting agent are sequentially added under stirring and stirred for 15-20 minutes, then 34kg of mica powder, 40kg of short aluminum silicate fibers, 4kg of fumed silica, 2kg of ultraviolet light absorber (2, 4-dihydroxy benzophenone), 30kg of far infrared powder and 40kg of nano titanium dioxide are sequentially added, high-speed dispersion is carried out for 35 minutes, then ball milling is carried out until the fineness is 50 micrometers, 380kg of modified aqueous acrylic resin, 8kg of aluminum powder slurry and 60kg of ceramic microspheres are added, and 80kg of curing agent (hexamethylene diisocyanate) is added and uniformly dispersed when the ultra-thin anti-radiation heat-insulating coating is used, so that the ultra-thin anti-radiation heat insulating coating is obtained.

Example 9

The preparation method of the ultrathin radiation-resistant heat-insulating coating in the embodiment 4 comprises the following steps:

275kg of deionized water is added into a material mixing tank, 4kg of aqueous dispersant, 2.5kg of defoaming agent and 4kg of wetting agent are sequentially added under stirring and stirred for 16 minutes, then 60kg of mica powder, 70kg of aluminum silicate short fiber, 9kg of fumed silica, 4kg of ultraviolet light absorbent (2-hydroxy-4-methoxybenzophenone), 40kg of far infrared powder and 65kg of nano titanium dioxide are sequentially added and dispersed for 40 minutes at high speed, then ball milling is carried out until the fineness is 50 micrometers, 420 parts of modified aqueous acrylic resin is added, 18kg of aluminum powder slurry and 90kg of ceramic micro-beads are uniformly dispersed, and 100kg of curing agent (hexamethylene diisocyanate) is added and uniformly dispersed when the ultra-thin type anti-radiation heat-insulating coating is used, so that the ultra-thin type anti-radiation heat insulating coating is obtained.

Example 10

The preparation method of the ultrathin radiation-resistant heat-insulating coating in the embodiment 5 comprises the following steps:

adding 250kg of deionized water into a mixing tank, sequentially adding 3kg of aqueous dispersant, 2kg of defoaming agent and 3kg of wetting agent under stirring, stirring for 18 minutes, then sequentially adding 50kg of mica powder, 50kg of aluminum silicate short fiber, 6kg of fumed silica, 3kg of ultraviolet light absorbent (2-hydroxy-4-methoxybenzophenone), 30kg of far infrared powder and 50kg of nano titanium dioxide, dispersing for 50 minutes at a high speed, ball-milling to 50 micrometers of fineness, adding 400kg of modified aqueous acrylic resin, uniformly dispersing 12kg of aluminum powder slurry and 75kg of ceramic microspheres, and adding 90kg of curing agent (hexamethylene diisocyanate) to uniformly disperse when in use, thereby obtaining the ultrathin radiation-resistant heat-insulating coating.

The ultra-thin radiation-resistant heat-insulating coatings of examples 1 to 5 were subjected to performance tests, the test standards or test methods are shown in table 1, and the results are shown in table 2.

TABLE 1 Performance test item name and test Standard or test method thereof

Test items	Test standards or test methods
		Surface drying time/min	GB/T1728-2020
Actual drying time/h	GB/T1728-2020
		Adhesion (drawing method)	GB/T5210-2006
Temperature resistance	GB1735-2009
		Low temperature resistance	GB1735-2009
Solar reflectance	GJB2502-2015
		Hemispherical emissivity	GJB2502-2015
Coefficient of thermal conductivity	GB/T10297-2015

Table 2 results of the performance tests

Since the components of example 5 and the ultra-thin type radiation-resistant heat-insulating coating obtained by the preparation method in example 10 have the most excellent performance, a comparative experiment is designed by using the components of example 5 to study the functions of certain components.

Comparative example 1

The anti-radiation heat-insulating coating is composed of the following raw materials: 400kg of modified waterborne acrylic resin, 3kg of waterborne dispersant, 2kg of defoamer, 3kg of wetting agent, 12kg of aluminum powder slurry, 50kg of mica powder, 75kg of ceramic micro-beads, 50kg of aluminum silicate short fiber, 6kg of fumed silica, 3kg of ultraviolet light absorber (2-hydroxy-4-methoxybenzophenone), 30kg of far infrared powder, 50kg of nano titanium dioxide, 90kg of curing agent (hexamethylene diisocyanate) and 250kg of deionized water; the fiber length of the aluminum silicate short fiber is 120-130 mu m; the ceramic micro-beads are ceramic hollow micro-beads with the particle size of 120-130 mu m;

the particle size of the mica powder is 200-300 meshes, and the mica powder is treated according to the pretreatment steps of the embodiment 5:

the particle size of the aluminum paste is 5-10 μm, and the aluminum paste is treated according to the pretreatment steps of example 5:

the modified water-based acrylic resin is prepared by the following steps:

(1) adding 15kg of ethylene glycol monobutyl ether and 20kg of dodecanethiol into a reaction kettle, and uniformly stirring at 60 ℃ to obtain a solvent for later use;

(2) uniformly mixing 50kg of acrylic acid, 32.5kg of hydroxyethyl methacrylate, 50kg of methyl methacrylate, 50kg of butyl acrylate, 8kg of hydroxy siloxane with the hydroxyl content of 2% and 2kg of dibenzoyl peroxide to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting for 2 hours at 60 ℃ after finishing dripping;

(3) after the reaction is finished, 20kg of dimethylethanolamine and 300kg of deionized water are added to the mixture, the solid content is tested to be 44%, and then the mixture is filtered and packaged to obtain the modified waterborne acrylic resin.

The hydroxyl siloxane with the hydroxyl content of 2 percent is organic modified silicone oil with the model of Tech-2080 produced by Shanghai Tyger Polymer technology Limited, and the organic modified silicone oil of other manufacturers has the same or similar effect.

Comparative example 2

The selection and quality of the materials except mica powder are the same as those in comparative example 5.

Comparative example 3

The selection and the quality of the rest materials are the same as those of the comparative example 5 except that the aluminum powder is directly added without pretreatment.

The results of the tests on the radiation-resistant and heat-insulating coating compositions of comparative examples 1 to 3 using the items in Table 1 are shown in Table 3.

TABLE 3 test results of the radiation-resistant heat-insulating coating of comparative examples 1 to 3

As can be seen from the comparison results of the comparative example 1 and the example 5 in the results of the table 3, the addition of the silanol hydrolyzate in the synthesis of the waterborne acrylic acid can not only change the refractive index of the resin, improve the radiation-resistant effect of the coating, but also shorten the surface drying time and the actual drying time of the coating. In addition, in tests, compared with the method of directly adding the small molecule organic silicon resin, the method has the advantages that the problems that the small molecule organic silicon resin is not easy to disperse, the reaction temperature is high, and the synthesized resin is poor in hardness and easy to stain in the resin synthesis process can be solved.

As can be seen from the comparison results of the comparative example 2 and the example 5 in the results of the table 3, the mica powder treated by NP-10 and methyl potassium silicate water can be better distributed in the coating, so that the solar reflectance and the hemispherical emissivity of the coating are effectively improved, the heat conductivity coefficient of the coating is reduced, and the heat insulation performance of the coating is improved.

As can be seen from the comparison results of comparative example 3 and example 5 in the results of Table 3, the aluminum powder treated by stearic acid can be uniformly distributed on the surface of the coating, so that the solar reflectance and the hemispherical emissivity of the coating are effectively improved, the thermal conductivity of the coating is reduced, the heat-insulating property of the coating is improved, and the compatibility of the aluminum powder and a water-based system can be improved by treating the aluminum powder by sodium polyacrylate.

Claims (6)

1. An ultra-thin type radiation-resistant heat-insulating coating is characterized in that: the composite material comprises the following raw materials in parts by weight: 350-450 parts of modified waterborne acrylic resin, 1-5 parts of waterborne dispersant, 1-3 parts of defoamer, 1-5 parts of wetting agent, 5-20 parts of aluminum powder slurry, 30-70 parts of mica powder, 50-100 parts of ceramic micro-beads, 30-80 parts of aluminum silicate short fibers, 2-10 parts of fumed silica, 1-5 parts of ultraviolet absorber, 20-50 parts of far infrared powder, 30-70 parts of nano titanium dioxide, 60-120 parts of curing agent and 200-300 parts of deionized water;

the particle size of the mica powder is 200-300 meshes, and the mica powder is pretreated by the following steps:

putting mica powder into a drying oven to be dried for 1-2 hours at the temperature of 60-70 ℃, then adding the mica powder into a mixer, adding NP-10 aqueous solution with the mass concentration of 8-12% while stirring, adding methyl potassium silicate aqueous solution with the mass concentration of 28-32% after fully and uniformly mixing, stirring and uniformly mixing, putting the mixture into the drying oven, and drying the mixture at the temperature of 60-70 ℃;

wherein the mass ratio of the mica powder to the NP-10 aqueous solution to the methyl potassium silicate aqueous solution is 90:8 to 12:14 to 18;

the modified waterborne acrylic resin is prepared by the following steps:

(1) adding 2-5 parts by weight of ethylene glycol butyl ether and 3-5 parts by weight of dodecanethiol into a reaction kettle, and uniformly stirring at 50-80 ℃ to obtain a solvent for later use;

(2) mixing 1-3 parts of monomethyl trichlorosilane and 4-8 parts of diphenyl dichlorosilane, adding the mixture into 8-12 parts of deionized water for hydrolysis reaction for several times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 60-65 parts of water for dilution and settling, discharging water for washing, repeating the steps for 5-6 times, and determining neutrality to obtain a finished silanol hydrolysate for later use;

(3) uniformly mixing 8-13 parts of acrylic acid, 6-7 parts of hydroxyethyl methacrylate, 5-16 parts of methyl methacrylate, 8-13 parts of butyl acrylate, 0.3-0.6 part of dibenzoyl peroxide and 1.5-3 parts of silane hydrolysate obtained in the step (2) to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting at 50-80 ℃ for 1.5-3 hours after finishing dripping;

(4) after the reaction is finished, 2-5 parts of dimethylethanolamine and 45-70 parts of deionized water are added into the mixture, the solid content of the modified waterborne acrylic resin is controlled to be 42-48% by the using amount of the deionized water, and then the mixture is filtered and packaged to obtain the modified waterborne acrylic resin.

2. The ultra-thin radiation-resistant heat-insulating coating as claimed in claim 1, wherein: the particle size of the aluminum paste is 5-10 mu m, and the aluminum paste is obtained according to the following steps:

heating aluminum powder to 75-85 ℃, adding stearic acid, uniformly stirring, then adding sodium polyacrylate, uniformly stirring for 1-2 hours, and cooling to 20-30 ℃ to obtain aluminum paste; the molecular weight of the sodium polyacrylate is 2000-4000;

wherein the mass ratio of the aluminum powder to the stearic acid to the sodium polyacrylate is 100:1 to 3:1 to 5.

3. The ultra-thin radiation-resistant heat-insulating coating as claimed in claim 1, wherein: the fiber length of the aluminum silicate short fiber is 90-150 mu m.

4. The ultra-thin radiation-resistant heat-insulating coating as claimed in claim 1, wherein: the ceramic microspheres are ceramic hollow microspheres with the particle size of 100-150 mu m.

5. The ultra-thin radiation-resistant heat-insulating coating as claimed in claim 1, wherein: the ultraviolet light absorber is phenyl o-hydroxybenzoate, resorcinol monobenzoate, 2, 4-dihydroxybenzophenone or 2-hydroxy-4-methoxybenzophenone; the far infrared powder is tourmaline far infrared functional powder; the curing agent is hexamethylene diisocyanate.

6. The preparation method of the ultrathin type radiation-resistant heat-insulating coating as claimed in claim 1, characterized by comprising the following steps: the method comprises the following steps:

adding 200-300 parts of deionized water into a mixing tank, sequentially adding 1-5 parts of water-based dispersant, 1-3 parts of defoaming agent and 1-5 parts of wetting agent under stirring, stirring for 15-20 minutes, then sequentially adding 30-70 parts of mica powder, 30-80 parts of aluminum silicate short fiber, 2-10 parts of fumed silica, 1-5 parts of ultraviolet absorber, 20-50 parts of far infrared powder and 30-70 parts of nano titanium dioxide, performing high-speed dispersion for at least 30 minutes, performing ball milling to 50 micrometers in fineness, adding 350-450 parts of modified water-based acrylic resin, 5-20 parts of aluminum powder slurry and 50-100 parts of ceramic micro-beads, uniformly dispersing, adding 60-120 parts of curing agent during use, and uniformly dispersing to obtain the ultrathin radiation-resistant heat-insulating coating;

the modified waterborne acrylic resin is prepared by the following steps:

(1) adding 2-5 parts by weight of ethylene glycol butyl ether and 3-5 parts by weight of dodecanethiol into a reaction kettle, and uniformly stirring at 50-80 ℃ to obtain a solvent for later use;

(2) mixing 1-3 parts of monomethyl trichlorosilane and 4-8 parts of diphenyl dichlorosilane, adding the mixture into 8-12 parts of deionized water for hydrolysis reaction for several times, controlling the reaction temperature to be 15-25 ℃, settling to discharge excessive water after the addition is finished, continuously adding 60-65 parts of water for dilution and settling, discharging water for washing, repeating the steps for 5-6 times, and determining the neutral pH value to obtain a silanol-forming hydrolysate for later use;

(3) uniformly mixing 8-13 parts of acrylic acid, 6-7 parts of hydroxyethyl methacrylate, 5-16 parts of methyl methacrylate, 8-13 parts of butyl acrylate, 0.3-0.6 part of dibenzoyl peroxide and 1.5-3 parts of silane hydrolysate obtained in the step (2) to form a mixed solution, adding the mixed solution into the reaction kettle in the step (1), controlling the temperature in the reaction kettle to be not more than 80 ℃ in the adding process, and reacting for 1.5-3 hours at 50-80 ℃ after dropwise adding;

(4) after the reaction is finished, 2-5 parts of dimethylethanolamine and 45-70 parts of deionized water are added into the mixture, and then the mixture is filtered and packaged to obtain the modified water-based acrylic resin.