High-heat-insulation nanometer silicon heat preservation coating and preparation method thereof

Abstract

The invention relates to the technical field of coating processing, in particular to a high-heat-insulation nanometer silicon heat preservation coating and a preparation method thereof.The high-heat-insulation nanometer silicon heat preservation coating is specifically prepared from, by weight, 15-23 parts of silicone acrylic emulsion, 12-15 parts of nanometer titanium dioxide, 2-5 parts of auxiliaries, 15-23 parts of heat insulation aerogel, 50-58 parts of functional filler and 3-4 parts of propylene glycol. According to the invention, the specially prepared heat insulation aerogel is introduced into the nano silicon coating, so that the heat insulation performance of the coating can be effectively improved, the resistance of the coating to stress can be improved, the cracking phenomenon of the coating can be effectively reduced, the service life of the coating can be prolonged, and meanwhile, the surface roughness of the coating can be remarkably improved; the contact area between the coating and the three-dimensional pattern playing a role in beautifying on the surface of the water cup is increased, so that the bonding strength between the coating and the three-dimensional pattern is improved, the three-dimensional pattern can be kept on the water cup for a long time, and the use experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coating processing, and specifically relates to a high heat-insulating nano-silicon thermal insulation coating and a preparation method thereof. Background Art

[0002] At present, in order to be beautiful, different three-dimensional patterns are printed on the body of a stainless steel water cup through 3D or 4D printing technology, so as to increase the beauty of the water cup and the visual experience of users. However, since the printing material is easy to fall off the cup body and the printed pattern has a cross feeling in terms of touch, therefore, a layer of coating needs to be sprayed on the cup body to protect the water cup and the pattern. Through the protection of the coating, the pattern can be firmly maintained on the cup body. At the same time, it can also make the pattern have a soft touch and improve the use experience.

[0003] For example, the invention patent with the publication number of CN119264753A discloses a water-based heat-insulating coating, which includes: a water-based resin, a film-forming auxiliary agent, and a heat-insulating agent. The water-based resin is selected from at least one of the material groups composed of acrylic resin, hydroxymethyl cellulose resin, and epoxy resin; the water-based resin has a minimum film-forming temperature of not less than 5°C; the film-forming auxiliary agent is selected from at least one of the material groups composed of: a plasticizer, an alcohol ether solvent, an alcohol ester solvent, a mixed solvent of ethylene glycol monobutyl ether and dipropylene glycol butyl ether, and an aprotic solvent; the heat-insulating agent is hydrated silica. By this means, the water-based heat-insulating coating has the technical effect of reducing carbon emissions, it can replace traditional solvent-based coatings, and can have a heat-insulating function; when this heat-insulating coating is sprayed on a stainless steel water cup, although it can play a certain heat-insulating role, due to the relatively smooth coating, the three-dimensional pattern cannot form a firm structure with the coating, and because the stability of the coating is general, during long-term use, affected by various factors, it is easy to crack, resulting in the destruction of the three-dimensional pattern structure and affecting the use experience. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a high heat-insulating nano-silicon thermal insulation coating and a preparation method thereof.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A high heat-insulating nano-silicon thermal insulation coating specifically includes the following components in parts by weight: 15-23 parts of silicon-acrylic emulsion, 12-15 parts of nano-titanium dioxide, 2-5 parts of an auxiliary agent, 15-23 parts of heat-insulating aerogel, 50-58 parts of a functional filler, and 3-4 parts of propylene glycol;

[0007] Among them, the functional filler is composed of fine-grained alumina, molybdenum disulfide, zinc oxide, and talcum powder according to a mass ratio of (20-26):(5-8):(1-3):(2-6);

[0008] The auxiliary agent is composed of a dispersant, a wetting agent, a curing agent, a film-forming auxiliary agent, a thickening agent, hydroxyethyl cellulose, and a pH regulator according to a mass ratio of (10 - 15) : (2 - 5) : (20 - 40) : (5 - 10) : (5 - 10) : (4 - 7) : (1 - 3).

[0009] As a further preferred embodiment of the present invention, the dispersant is selected from one or more of sodium polyacrylate, polyvinyl alcohol, sodium hexametaphosphate, and sodium pyrophosphate;

[0010] The film-forming auxiliary agent is prepared by compounding dodecyl alcohol ester and dipropylene glycol butyl ether according to a weight ratio of 1:1;

[0011] The thickening agent is selected from one or more of diatomite, sodium-based bentonite, carboxymethyl cellulose, xanthan gum, and polyacrylamide;

[0012] The curing agent is selected from any one of diethylenetriamine, m-phenylenediamine, and 4,4'-diaminodiphenyl sulfone.

[0013] As a further preferred embodiment of the present invention, the preparation method of the heat-insulating aerogel is as follows:

[0014] 1) Mix deionized water, hydrochloric acid, and cetyltrimethylammonium bromide evenly by stirring, add methyltriethoxysilane and dimethyldiethoxysilane, and magnetically stir at 25 - 28°C in a water bath for 2 - 5 h to obtain a reaction solution;

[0015] 2) Ultrasonically disperse the porous silica composite in the reaction solution, then add urea, and let it stand at 80 - 83°C for 10 - 15 h to obtain a wet gel. After repeatedly washing with alcohol and n-hexane, dry it to a constant weight at 60 - 70°C under normal pressure, and obtain the heat-insulating aerogel after ultrafine pulverization and grinding.

[0016] Furthermore, in step 1), the dosage ratio of the deionized water, hydrochloric acid, cetyltrimethylammonium bromide, methyltriethoxysilane, and dimethyldiethoxysilane is (15 - 20) mL : (0.075 - 0.083) mL : (0.8 - 1.2) g : (3.6 - 4.2) mL : (1.2 - 1.6) mL.

[0017] Furthermore, in step 2), the dosage ratio of the porous silica composite, the reaction solution, and urea is (0.2 - 0.5) g : (20 - 26) mL : (3 - 7) g.

[0018] As a further preferred embodiment of the present invention, the preparation method of the porous silica composite is as follows:

[0019] 1) adding ethanol, deionized water and ammonia water to tetraethyl orthosilicate in sequence under magnetic stirring, reacting in a water bath at 35-38° C. for 3-5 hours, repeatedly washing with deionized water, centrifuging and drying to obtain silica nanoparticles;

[0020] 2) Weighing silica nanoparticles, adding deionized water and polyvinyl pyrrolidone, adding sodium borohydride after sufficient stirring, stirring and reacting in a water bath at 46-48° C. for 10-15 hours, repeatedly washing with deionized water, centrifuging, and drying to obtain porous silica microspheres;

[0021] 3) Dissolve thioacetamide and zinc nitrate in deionized water, stir thoroughly, then add anhydrous ethanol, stir to form a uniform solution, then add porous silica microspheres, disperse evenly and place in a reactor, react at a constant temperature of 180-185° C. for 6-8 hours, and after the reaction is completed, naturally cool to room temperature, wash the product repeatedly with deionized water and ethanol alternately, and dry to obtain a porous silica composite.

[0022] Furthermore, in step 1), the volume ratio of ethanol, deionized water, ammonia water and tetraethyl orthosilicate is (30-50):(12-18):(2.5-3.2):(2-5).

[0023] Furthermore, in step 2), the usage ratio of the silica nanoparticles, deionized water, polyvinyl pyrrolidone, and sodium borohydride is (0.3-0.5) g: (10-18) mL: (0.25-0.30) g: (0.6-0.9) g.

[0024] Furthermore, in step 3), the usage ratio of thioacetamide, zinc nitrate, deionized water, anhydrous ethanol, and porous silica microspheres is (0.5-0.8) mmol: (4-7) mmol: (15-20) mL: (15-20) mL: (1-3) g.

[0025] A method for preparing a high-insulation nano-silicon thermal insulation coating comprises the following steps:

[0026] 1) Add distilled water into the dispersion kettle, control the speed to 500-600rpm, slowly add hydroxyethyl cellulose according to the weight, stir evenly, then add pH regulator, increase the speed to 1000-1200rpm, and disperse at high speed for 15-20min;

[0027] 2) After step 1) is dispersed into a uniform transparent liquid, the rotation speed is reduced to 500-600 rpm, and a dispersant, a wetting agent and propylene glycol are added in sequence;

[0028] 3) After stirring evenly, slowly and uniformly add nano-titanium dioxide, functional filler, and heat-insulating aerogel, then increase the rotation speed to 1100 - 1300 rpm, stir at high speed for 40 - 50 min, reduce the rotation speed to 500 - 600 rpm, and slowly add silicone-acrylic emulsion, curing agent, film-forming aid, and thickener in sequence, stir at low speed for 20 - 50 min, and control the viscosity at 100 - 110 KU to obtain the high heat-insulating nano-silicon thermal insulation coating.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] In the present invention, porous silica is used as the matrix material, and through hydrothermal reaction, a multi-level three-dimensional network structure is formed on its surface to obtain a porous silica composite. This network structure is composed of nano-spheres and nano-sheets. The surface of the interlaced nano-sheets has a large specific surface area and open space, which can not only increase the cross-linking sites during gelation, but also effectively increase the cross-linking density and strengthen the framework structure of the aerogel, thereby significantly improving the heat-insulating performance of the gel. Moreover, by controlling the dosage of zinc nitrate, an increase in the content of nano-sheets in the network structure can be achieved. With the increase in the content of nano-sheets, agglomerated small particles will appear in the network structure. In the subsequent synthesis of heat-insulating aerogel, some nano-sheets will be directly exposed outside the heat-insulating aerogel without being wrapped by the matrix. The exposed nano-sheets will cause convex sheet-like structures to appear on the surface of the heat-insulating aerogel, which will significantly increase the surface roughness of the coating in the coating, thereby helping to increase the contact area between the coating and the three-dimensional pattern that plays a decorative role on the surface of the water cup, thus improving the bonding strength between the two, enabling the three-dimensional pattern to be permanently retained on the water cup; then, using the porous silica composite as a nucleating agent, heat-insulating aerogel is synthesized. The introduction of the porous silica composite refines the particle size of the heat-insulating aerogel, and the aerogel framework changes from a pearl-like chain structure to a closely stacked structure, and the framework connection strength is significantly enhanced, endowing it with good mechanical properties. With the enhancement of the performance of the heat-insulating aerogel, when it is introduced into the coating, its multi-porous structure significantly reduces the heat conduction efficiency, showing excellent heat-insulating performance. At the same time, the multi-porous framework structure can effectively transfer and disperse stress in the coating, improving the coating's resistance to stress, thereby effectively reducing the occurrence of coating cracking and increasing the service life of the coating.

[0031] In the present invention, by introducing a specially prepared heat-insulating aerogel into the nano-silicon coating, not only can the heat-insulating performance of the coating be effectively improved, but also it helps to enhance the stress resistance of the coating, effectively reduce the cracking phenomenon of the coating, improve the service life of the coating. At the same time, it also helps to significantly increase the surface roughness of the coating, increase the contact area between the coating and the three-dimensional pattern on the surface of the water cup that plays a decorative role, thereby improving the bonding strength between the two, enabling the three-dimensional pattern to be permanently maintained on the water cup and enhancing the user experience. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] In the embodiments of the present invention, the dispersant is selected from sodium polyacrylate; the film-forming aid is compounded from dodecyl alcohol ester and dipropylene glycol butyl ether in a weight ratio of 1:1; the thickener is selected from diatomite; the curing agent is selected from diethylenetriamine.

[0034] Example 1

[0035] A high heat-insulating nano-silicon heat-preserving coating specifically includes the following components in parts by weight: 15 parts of silicon-acrylic emulsion, 12 parts of nano-titanium dioxide, 2 parts of additives, 15 parts of heat-insulating aerogel, 50 parts of functional filler, and 3 parts of propylene glycol;

[0036] Among them, the functional filler is composed of fine-crystalline alumina, molybdenum disulfide, zinc oxide, and talc powder in a mass ratio of 20:5:1:2;

[0037] The additives are composed of a dispersant, a wetting agent, a curing agent, a film-forming aid, a thickener, hydroxyethyl cellulose, and a pH regulator in a mass ratio of 10:2:20:5:5:4:1.

[0038] The preparation scheme of the high heat-insulating nano-silicon heat-preserving coating specifically includes the following steps:

[0039] 1) Add distilled water into the dispersion kettle, control the rotation speed at 500 rpm, and slowly add hydroxyethyl cellulose according to the parts by weight. After stirring evenly, add the pH regulator, increase the rotation speed to 1000 rpm, and disperse at high speed for 15 minutes;

[0040] 2) After the dispersion in step 1) becomes a uniform transparent liquid, reduce the rotation speed to 500 rpm, and sequentially add the dispersant, the wetting agent, and propylene glycol;

[0041] 3) After stirring evenly, slowly and uniformly add nano titanium dioxide, functional filler and thermal insulation aerogel, then increase the speed to 1100 rpm, stir at high speed for 40 minutes, reduce the speed to 500 rpm, slowly add silicone acrylic emulsion, curing agent, film-forming aid, thickener in turn, stir at low speed for 20 minutes, control the viscosity to 100 KU, and you can get a high thermal insulation nano silicon thermal insulation coating.

[0042] The preparation method of thermal insulation aerogel is as follows:

[0043] 1) 30 mL of ethanol, 12 mL of deionized water and 2.5 mL of ammonia water were added to 2 mL of ethyl orthosilicate in sequence under magnetic stirring, reacted in a water bath at 35° C. for 3 h, and then repeatedly washed with deionized water, centrifuged and dried to obtain silica nanoparticles;

[0044] 2) Weigh 0.3 g of silica nanoparticles, add 10 mL of deionized water and 0.25 g of polyvinyl pyrrolidone, stir thoroughly, add 0.6 g of sodium borohydride, stir and react in a 46°C water bath for 10 h, repeatedly wash with deionized water, centrifuge and dry to obtain porous silica microspheres;

[0045] 3) 0.5 mmol thioacetamide and 4 mmol zinc nitrate were dissolved in 15 mL deionized water, and after being fully stirred, 15 mL anhydrous ethanol was added and stirred to form a uniform solution, and then 1 g of porous silica microspheres were added, and after being evenly dispersed, they were placed in a reaction kettle and reacted at a constant temperature of 180° C. for 6 h. After the reaction was completed, it was naturally cooled to room temperature, and the product was repeatedly washed with deionized water and ethanol alternately, and dried to obtain a porous silica composite;

[0046] 4) 15 mL of deionized water, 0.075 mL of hydrochloric acid and 0.8 g of hexadecyltrimethylammonium bromide were mixed and stirred evenly, 3.6 mL of methyltriethoxysilane and 1.2 mL of dimethyldiethoxysilane were added, and magnetic stirring was performed in a water bath at 25° C. for 2 h to obtain a reaction solution;

[0047] 5) 0.2 g of the porous silica composite was ultrasonically dispersed in 20 mL of the reaction solution, and then 3 g of urea was added and allowed to stand at 80° C. for 10 h to obtain a wet gel. After repeated washing with alcohol and n-hexane, the wet gel was dried at 60° C. under normal pressure to constant weight, and ultrafinely ground to obtain a thermal insulation aerogel.

[0048] Example 2

[0049] A high heat-insulating nano-silicon thermal insulation coating, specifically comprising the following components by weight: 20 parts of silicone-acrylic emulsion, 13 parts of nano-titanium dioxide, 3 parts of additives, 20 parts of heat-insulating aerogel, 55 parts of functional fillers, and 4 parts of propylene glycol;

[0050] Among them, the functional filler is composed of fine crystalline alumina, molybdenum disulfide, zinc oxide, and talcum powder in a mass ratio of 23:7:2:5;

[0051] The auxiliary agent is composed of a dispersant, a wetting agent, a curing agent, a film-forming auxiliary agent, a thickening agent, hydroxyethyl cellulose, and a pH regulator in a mass ratio of 13:3:30:7:7:5:2.

[0052] The preparation scheme of the high heat-insulating nano-silicon thermal insulation coating specifically includes the following steps:

[0053] 1) Add distilled water into a dispersion kettle, control the rotation speed at 600 rpm, and slowly add hydroxyethyl cellulose according to the weight parts. After stirring evenly, add the pH regulator, increase the rotation speed to 1100 rpm, and disperse at high speed for 18 min;

[0054] 2) After the dispersion in step 1) becomes a uniform transparent liquid, reduce the rotation speed to 600 rpm, and sequentially add the dispersant, the wetting agent, and propylene glycol;

[0055] 3) After stirring evenly, slowly and uniformly add nano-titanium dioxide, the functional filler, and the thermal insulation aerogel, then increase the rotation speed to 1200 rpm, stir at high speed for 45 min, reduce the rotation speed to 600 rpm, and sequentially and slowly add the silicon-acrylic emulsion, the curing agent, the film-forming auxiliary agent, and the thickening agent, and stir at low speed for 40 min. Control the viscosity at 110 KU to obtain the high heat-insulating nano-silicon thermal insulation coating.

[0056] Among them, the preparation method of the thermal insulation aerogel is as follows:

[0057] 1) Add 40 mL of ethanol, 15 mL of deionized water, and 2.8 mL of ammonia water to 3 mL of tetraethyl orthosilicate in sequence under magnetic stirring, react in a water bath at 36 °C for 4 h, and then wash, centrifuge, and dry repeatedly with deionized water to obtain silicon dioxide nanoparticles;

[0058] 2) Weigh 0.4 g of silicon dioxide nanoparticles, add 15 mL of deionized water and 0.28 g of polyvinylpyrrolidone, stir well, then add 0.8 g of sodium borohydride, stir and react in a water bath at 47 °C for 13 h, and wash, centrifuge, and dry repeatedly with deionized water to obtain porous silicon dioxide microspheres;

[0059] 3) Dissolve 0.7 mmol of thioacetamide and 5 mmol of zinc nitrate in 18 mL of deionized water, stir well, then add 18 mL of absolute ethanol, stir to form a uniform solution, then add 2 g of porous silicon dioxide microspheres, disperse evenly, place them in a reaction kettle, and react at a constant temperature of 183 °C for 7 h. After the reaction is completed, naturally cool to room temperature, and wash the product repeatedly with deionized water and ethanol alternately, and dry it to obtain a porous silicon dioxide composite;

[0060] 4) Mix 18 mL of deionized water, 0.080 mL of hydrochloric acid, and 1.0 g of cetyltrimethylammonium bromide, stir evenly, add 3.9 mL of methyltriethoxysilane and 1.5 mL of dimethyldiethoxysilane, and magnetically stir for 3 h in a 26 °C water bath to obtain a reaction solution;

[0061] 5) Ultrasonically disperse 0.4 g of porous silica composite in 25 mL of the reaction solution, then add 5 g of urea, let it stand at 82 °C for 13 h to obtain a wet gel. After repeatedly washing with alcohol and n-hexane, dry it at 65 °C under normal pressure until it reaches a constant weight. After ultra-fine pulverization and grinding, a thermal insulation aerogel is obtained.

[0062] Example 3

[0063] A highly heat-insulating nano-silicon thermal insulation coating specifically includes the following components in parts by weight: 23 parts of silicone-acrylic emulsion, 15 parts of nano-titanium dioxide, 5 parts of additives, 23 parts of thermal insulation aerogel, 58 parts of functional filler, and 4 parts of propylene glycol;

[0064] Among them, the functional filler is composed of fine-grained alumina, molybdenum disulfide, zinc oxide, and talcum powder in a mass ratio of 26:8:3:6;

[0065] The additives are composed of a dispersant, a wetting agent, a curing agent, a film-forming aid, a thickener, hydroxyethyl cellulose, and a pH regulator in a mass ratio of 15:5:40:10:10:7:3.

[0066] The preparation scheme of the highly heat-insulating nano-silicon thermal insulation coating specifically includes the following steps:

[0067] 1) Add distilled water into a dispersion kettle, control the rotation speed at 600 rpm, and slowly add hydroxyethyl cellulose according to the parts by weight. After stirring evenly, add the pH regulator, increase the rotation speed to 1200 rpm, and disperse at high speed for 20 min;

[0068] 2) After the dispersion in step 1) becomes a uniform and transparent liquid, reduce the rotation speed to 600 rpm, and sequentially add the dispersant, the wetting agent, and propylene glycol;

[0069] 3) After stirring evenly, slowly and uniformly add nano-titanium dioxide, the functional filler, and the thermal insulation aerogel, then increase the rotation speed to 1300 rpm, stir at high speed for 50 min, reduce the rotation speed to 600 rpm, and sequentially and slowly add the silicone-acrylic emulsion, the curing agent, the film-forming aid, and the thickener, and stir at low speed for 50 min to control the viscosity at 110 KU, then the highly heat-insulating nano-silicon thermal insulation coating can be obtained.

[0070] Among them, the preparation method of the thermal insulation aerogel is as follows:

[0071] 1) 50 mL of ethanol, 18 mL of deionized water and 3.2 mL of ammonia water were added to 5 mL of ethyl orthosilicate in sequence under magnetic stirring, reacted in a water bath at 38° C. for 5 h, and then repeatedly washed with deionized water, centrifuged and dried to obtain silica nanoparticles;

[0072] 2) Weigh 0.5 g of silica nanoparticles, add 18 mL of deionized water and 0.30 g of polyvinyl pyrrolidone, stir thoroughly, add 0.9 g of sodium borohydride, stir and react in a 48°C water bath for 15 h, repeatedly wash with deionized water, centrifuge and dry to obtain porous silica microspheres;

[0073] 3) 0.8 mmol thioacetamide and 7 mmol zinc nitrate were dissolved in 20 mL deionized water, and after being fully stirred, 20 mL anhydrous ethanol was added and stirred to form a uniform solution, and then 3 g porous silica microspheres were added, and after being evenly dispersed, they were placed in a reaction kettle and reacted at a constant temperature of 185° C. for 8 h. After the reaction was completed, it was naturally cooled to room temperature, and the product was repeatedly washed with deionized water and ethanol alternately, and dried to obtain a porous silica composite;

[0074] 4) 20 mL of deionized water, 0.083 mL of hydrochloric acid and 1.2 g of hexadecyltrimethylammonium bromide were mixed and stirred evenly, 4.2 mL of methyltriethoxysilane and 1.6 mL of dimethyldiethoxysilane were added, and magnetic stirring was performed in a water bath at 28° C. for 5 h to obtain a reaction solution;

[0075] 5) 0.5 g of the porous silica composite was ultrasonically dispersed in 26 mL of the reaction solution, and then 7 g of urea was added and allowed to stand at 83 ° C for 15 h to obtain a wet gel. After repeated washing with alcohol and n-hexane, it was dried at 70 ° C under normal pressure to constant weight, and after ultrafine grinding, a thermal insulation aerogel was obtained.

[0076] Comparative Example 1: This comparative example is basically the same as Example 1, except that it does not contain thermal insulation aerogel.

[0077] Comparative Example 2: This comparative example is basically the same as Example 1, except that step 1) is omitted in the preparation of the thermal insulation aerogel.

[0078] Comparative Example 3: This comparative example is basically the same as Example 1, except that step 2) is omitted in the preparation of the thermal insulation aerogel.

[0079] Comparative Example 4: This comparative example is basically the same as Example 1, except that step 3) is omitted in the preparation of the thermal insulation aerogel.

[0080] Comparative Example 5: This comparative example is basically the same as Example 1, except that in the preparation of the thermal insulation aerogel, steps 4)-5) are omitted.

[0081] The items and test methods for physical property evaluation are described as follows.

[0082] Heat insulation temperature difference (°C): According to the standard method of HG / T 4341-2012, the heat insulation temperature difference (°C) test is carried out on the above-mentioned coating samples dried at 280 °C.

[0083] 200g falling ball test: Print a three-dimensional pattern on the surface of the above-mentioned coating dried at 280 °C. Using a falling ball impact testing machine, a 200-gram steel ball is freely dropped from a predetermined falling ball height (such as 100 cm) onto the above-mentioned three-dimensional pattern sample to observe whether the three-dimensional pattern falls off.

[0084] Table 1 Coating test results of heat insulation coatings

[0085]

[0086] As can be seen from Table 1, the heat insulation coating in the present invention, when sprayed on a stainless steel water cup, not only has a good heat insulation effect, but also has a high bonding strength with the three-dimensional pattern, can effectively resist the impact of external forces, is not easy to break and fall off, and improves the use experience.

[0087] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A high heat-insulating nano-silicon thermal insulation coating, characterized in that, Specifically, it includes the following components in parts by weight: 15-23 parts of silicone-acrylic emulsion, 12-15 parts of nano-titanium dioxide, 2-5 parts of additives, 15-23 parts of thermal insulation aerogel, 50-58 parts of functional filler, and 3-4 parts of propylene glycol; Among them, the functional filler is composed of fine crystal alumina, molybdenum disulfide, zinc oxide, and talcum powder according to the mass ratio of (20-26):(5-8):(1-3):(2-6); The additives are composed of dispersant, wetting agent, curing agent, film-forming aid, thickening agent, hydroxyethyl cellulose, and pH regulator according to the mass ratio of (10-15):(2-5):(20-40):(5-10):(5-10):(4-7):(1-3); 2. The highly heat-insulating nano-silicon thermal insulation coating according to claim 1, wherein The dispersant is selected from one or more of sodium polyacrylate, polyvinyl alcohol, sodium hexametaphosphate, and sodium pyrophosphate; The film-forming aid is compounded from dodecyl alcohol ester and dipropylene glycol butyl ether in a weight ratio of 1:1; The thickening agent is selected from one or more of diatomite, sodium-based bentonite, carboxymethyl cellulose, xanthan gum, and polyacrylamide; The curing agent is selected from any one of diethylenetriamine, m-phenylenediamine, and 4,4'-diaminodiphenyl sulfone; 3. The highly heat-insulating nano-silicon thermal insulation coating according to claim 1, characterized in that, The preparation method of the thermal insulation aerogel is as follows: 1) Mix deionized water, hydrochloric acid, and cetyltrimethylammonium bromide evenly by stirring, add methyltriethoxysilane and dimethyldiethoxysilane, and magnetically stir for 2-5 h in a water bath at 25-28 °C to obtain a reaction solution; 2) Ultrasonically disperse the porous silica composite in the reaction solution, then add urea, and stand for 10-15 h at 80-83 °C to obtain a wet gel. After repeatedly washing with alcohol and n-hexane, dry it to constant weight at 60-70 °C under normal pressure, and obtain the thermal insulation aerogel after ultra-fine pulverization and grinding.

4. The highly heat-insulating nano-silicon thermal insulation coating according to claim 3, characterized in that, In step 1), the dosage ratio of deionized water, hydrochloric acid, cetyltrimethylammonium bromide, methyltriethoxysilane, and dimethyldiethoxysilane is (15-20) mL:(0.075-0.083) mL:(0.8-1.2) g:(3.6-4.2) mL:(1.2-1.6) mL.

5. A high heat-insulating nano-silicon thermal insulation coating according to claim 3, wherein In step 2), the dosage ratio of the porous silica composite, the reaction solution, and urea is (0.2-0.5) g:(20-26) mL:(3-7) g.

6. The highly heat-insulating nano-silicon thermal insulation coating according to claim 3, wherein, The preparation method of the porous silica composite is as follows: 1) Add ethanol, deionized water, and mL of ammonia water to tetraethyl orthosilicate in turn under magnetic stirring, react in a water bath at 35-38 °C for 3-5 h, and then repeatedly wash, centrifuge, and dry with deionized water to obtain silica nanoparticles; 2) Weigh the silica nanoparticles, add deionized water and polyvinylpyrrolidone, fully stir, then add sodium borohydride, and stir and react in a water bath at 46-48 °C for 10-15 h. Repeatedly wash, centrifuge, and dry with deionized water to obtain porous silica microspheres; 3) Dissolve thioacetamide and zinc nitrate in deionized water. After stirring well, add absolute ethanol, stir to form a homogeneous solution, then add porous silica microspheres. After dispersing evenly, place it in a reaction kettle and react at a constant temperature of 180 - 185 °C for 6 - 8 h. After the reaction is completed, cool it naturally to room temperature. Wash the product repeatedly with deionized water and ethanol alternately, and after drying, the porous silica composite can be obtained.

7. The high heat insulation nano-silicon thermal insulation coating according to claim 6, characterized in that, In step 1), the volume ratio of the ethanol, deionized water, ammonia water, and tetraethyl orthosilicate is (30 - 50):(12 - 18):(2.5 - 3.2):(2 - 5).

8. A high heat-insulating nano-silicon thermal insulation coating according to claim 6, characterized in that, In step 2), the dosage ratio of the silica nanoparticles, deionized water, polyvinylpyrrolidone, and sodium borohydride is (0.3 - 0.5) g:(10 - 18) mL:(0.25 - 0.30) g:(0.6 - 0.9) g.

9. A high heat insulation nano-silicon thermal insulation coating according to claim 6, characterized in that, In step 3), the dosage ratio of the thioacetamide, zinc nitrate, deionized water, absolute ethanol, and porous silica microspheres is (0.5 - 0.8) mmol:(4 - 7) mmol:(15 - 20) mL:(15 - 20) mL:(1 - 3) g.

10. The preparation method of a highly heat-insulating nano-silicon thermal insulation coating according to any one of claims 1-9, characterized in that, Specifically, it includes the following steps: 1) Add distilled water into a dispersion kettle, control the rotation speed at 500 - 600 rpm, and slowly add hydroxyethyl cellulose according to the weight parts. After stirring evenly, add a pH regulator, increase the rotation speed to 1000 - 1200 rpm, and disperse at high speed for 15 - 20 min; 2) After the dispersion in step 1) becomes a homogeneous transparent liquid, lower the rotation speed to 500 - 600 rpm, and sequentially add a dispersant, a wetting agent, and propylene glycol; 3) After stirring evenly, slowly and uniformly add nano - titanium dioxide, functional fillers, and heat - insulating aerogel, then increase the rotation speed to 1100 - 1300 rpm, stir at high speed for 40 - 50 min, lower the rotation speed to 500 - 600 rpm, and sequentially and slowly add a silicon - acrylic emulsion, a curing agent, a film - forming aid, a thickener, and stir at low speed for 20 - 50 min. Control the viscosity at 100 - 110 KU, and the high - heat - insulating nano - silicon thermal insulation coating can be obtained.

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