A heat-insulating coating containing mesoporous nanomaterials and a preparation method thereof

Abstract

This invention relates to the field of functional coatings technology, and discloses a heat-insulating coating containing mesoporous nanomaterials and its preparation method. The preparation method is as follows: mesoporous silica nanopowder, titanium dioxide, modified hollow glass microspheres, and dispersant BYK-161 are sequentially added to deionized water, and stirred continuously at 1500-2000 rpm for 20-30 min to obtain a slurry. Silicone-acrylic emulsion, modified cashew nut shell powder, thickener RW-8W, and defoamer BYK-024 are added to the slurry, and stirring is continued for 15-25 min to obtain the heat-insulating coating containing mesoporous nanomaterials. The heat-insulating coating of this invention not only has good heat insulation performance but also improves corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of functional coatings technology, specifically to a heat-insulating coating containing mesoporous nanomaterials and its preparation method. Background Technology

[0002] With the continuous growth of global energy demand and the rising energy consumption of buildings, building energy conservation, lightweight transportation, and thermal insulation have become key technological areas of concern for countries worldwide. Among these, passive thermal insulation through surface coating technology is one of the effective means to improve energy efficiency and reduce carbon emissions. Thermal insulation coatings, as a functional coating material that is easy to apply, low in cost, and widely applicable, have been extensively researched and applied in engineering in recent years. However, most traditional coatings have limited functionality and are gradually failing to meet the demands of use. Therefore, avoiding this phenomenon is key to solving the problem. For example, patent CN120041018A discloses an ultralight thermal insulation coating and its preparation method. This coating possesses ultralight weight and thermal insulation properties, but its corrosion resistance needs improvement. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a heat-insulating coating containing mesoporous nanomaterials and its preparation method. The heat-insulating coating of this invention not only has good heat insulation performance but also improves corrosion resistance.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a heat-insulating coating containing mesoporous nanomaterials, comprising the following weight components: 40-50 parts by weight of silicone-acrylic emulsion, 4-6 parts by weight of mesoporous silica nanopowder, 1-3 parts by weight of modified hollow glass microspheres, 2-4 parts by weight of modified cashew nut shell powder, 1-2 parts by weight of titanium dioxide, 0.5-0.8 parts by weight of dispersant BYK-161, 0.3-0.5 parts by weight of defoamer BYK-024, 0.4-0.6 parts by weight of thickener RW-8W, and 12-15 parts by weight of deionized water.

[0005] Furthermore, the method for preparing the modified hollow glass microspheres is as follows: Step 1: Add 0.5 mol / L sodium hydroxide aqueous solution and hollow glass microspheres to the reactor, stir and disperse, etch in a water bath at 85-95℃ for 1.5-2 hours, let stand and filter to separate the product, wash until the washing solution is neutral, and dry at 80-90℃ for 4-6 hours to obtain surface hydroxylated hollow glass microspheres. Step 2: Add 90% ethanol-water solution and surface hydroxylated hollow glass microspheres to the reactor, stir and disperse, heat to reflux in a water bath at 80-100℃, then add γ-(2,3-epoxypropoxy)propyltrimethoxysilane dropwise, react under reflux for 3-5 hours, after the reaction is completed, filter, wash and dry to obtain epoxidized hollow glass microspheres; Step 3: Under nitrogen protection, 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, epoxidized hollow glass microspheres, and sodium hydroxide were added to the xylene solution. The reaction was carried out at 85-95℃ for 6-8 hours. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to neutral with 0.1 mol / L dilute hydrochloric acid solution. The mixture was then filtered, washed, and dried to obtain the modified hollow glass microspheres.

[0006] Furthermore, in step one, the ratio of sodium hydroxide aqueous solution to hollow glass microspheres is 100-110 mL: 4.82-4.86 g.

[0007] Furthermore, in step two, the ratio of ethanol-water solution, surface-hydroxylated hollow glass microspheres, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 90-100mL:3.04-3.08g:0.3-0.4g.

[0008] Further, in step three, the ratio of xylene, 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, epoxidized hollow glass microspheres, and sodium hydroxide is 110-115mL:2.02-2.06g:2.41-2.45g:0.02-0.03g.

[0009] Furthermore, the preparation method of the modified cashew phenol is as follows: S1: Under nitrogen protection, cashew phenol, triethylamine, 4-dimethylaminopyridine and 4-methoxyphenol were added to dichloromethane solvent and stirred evenly in an ice-water bath. Then, succinyl chloride was added dropwise and the reaction was carried out at 40-50℃ for 3-5 hours. After the reaction was completed, the mixture was filtered, washed and the solvent was removed by rotary evaporation to obtain intermediate 1. S2: Under nitrogen protection, intermediate 1, formic acid, and p-toluenesulfonic acid were added to toluene solvent, stirred and mixed, and then hydrogen peroxide was added dropwise. The reaction was carried out at 55-65℃ for 5-8 hours. After the reaction was completed, the mixture was washed and dried, and then rotary evaporated to obtain intermediate 2. S3: Add intermediate 2,2,6-diaminopyridine to N,N-dimethylformamide solution, stir and mix, then add triethylamine, stir at 60-80℃ for 3-5 h, after the reaction is complete, remove the solvent by rotary evaporation, dry to obtain modified cashew phenol.

[0010] Further, the ratio of dichloromethane, cashew phenol, triethylamine, 4-dimethylaminopyridine, 4-methoxyphenol, and succinyl chloride in S1 is 35-40 mL: 10.1-10.3 g: 3.34-3.38 g: 0.03-0.04 g: 0.02-0.03 g: 2.92-2.96 g.

[0011] Furthermore, the ratio of toluene, intermediate 1, formic acid, p-toluenesulfonic acid, and hydrogen peroxide in S2 is 12-15 mL: 4.82-4.86 g: 1.44-1.48 g: 0.03-0.04 g: 7.88-7.92 g.

[0012] Further, the ratio of N,N-dimethylformamide, intermediate 2,2,6-diaminopyridine, and triethylamine in S3 is 18-20 mL: 3.02-3.06 g: 1.21-1.25 g: 0.02-0.03 g.

[0013] Furthermore, the preparation method of the heat-insulating coating containing mesoporous nanomaterials is as follows: mesoporous silica nanopowder, titanium dioxide, modified hollow glass microspheres, and dispersant BYK-161 are added sequentially to deionized water, and stirred continuously at 1500-2000 rpm for 20-30 min to obtain a slurry. Silicone-acrylic emulsion, modified cashew nut shell powder, thickener RW-8W, and defoamer BYK-024 are added to the slurry, and stirring is continued for 15-25 min to obtain the heat-insulating coating containing mesoporous nanomaterials.

[0014] (iii) Beneficial technical effects This invention utilizes mesoporous silica nanoparticles and hollow glass microspheres as the core functional fillers in a thermal insulation coating. Mesoporous silica provides a high specific surface area and a micro / nano-scale air barrier layer, while hollow glass microspheres provide a macroscopic lightweight structure and a thermal insulation cavity. Their synergistic effect significantly reduces the coating's thermal conductivity and improves its thermal insulation performance. The hollow glass microspheres are grafted with 2-(2,4-dihydroxyphenyl)-2H-phenyltriazole to introduce a phenyltriazole structure, which efficiently absorbs ultraviolet light, preventing photodegradation of the resin matrix and improving the coating's weather resistance. The aromatic ring structure of cashew nut shell powder reflects some infrared radiation, synergistically enhancing the coating's thermal insulation effect with the mesoporous materials. Furthermore, cashew nut shell powder has a natural inhibitory effect on bacteria and fungi, delaying microbial corrosion of the coating. The reaction of 2,6-diaminopyridine with intermediate 2 introduces a pyridine ring. The pyridine ring and amino group can chelate with metal ions, inhibiting electrochemical corrosion of the metal substrate and improving the coating's corrosion resistance. Attached Figure Description

[0015] Figure 1 This is the synthesis reaction formula for intermediate 1. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0018] The reagents used in the following specific embodiments are of analytical grade. Additionally: Silicone-acrylic emulsion: Industrial grade, sourced from Guangzhou Shenchuang Chemical Co., Ltd.

[0019] Mesoporous silica nanoparticles: pore size is 10 nm.

[0020] Example 1 (1) Add 100 mL of 0.5 mol / L sodium hydroxide aqueous solution and 4.82 g of hollow glass microspheres to the reactor, stir and disperse, etch in an 85°C water bath for 1.5 h, let stand and filter to separate the product, wash until the washing solution is neutral, and dry at 80°C for 4 h to obtain surface hydroxylated hollow glass microspheres. (2) Add 90 mL of 90% ethanol-water solution and 3.04 g of surface hydroxylated hollow glass microspheres to the reactor, stir and disperse, heat to reflux in a water bath at 80 °C, and then add 0.3 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane dropwise. React under reflux for 3 h. After the reaction is completed, filter, wash and dry to obtain epoxidized hollow glass microspheres. (3) Under nitrogen protection, 2.02 g of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, 2.41 g of epoxidized hollow glass microspheres and 0.02 g of sodium hydroxide were added to 110 mL of xylene solution. The reaction was carried out at 85 °C for 6 h. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to neutral with 0.1 mol / L dilute hydrochloric acid solution. The mixture was filtered, washed and dried to obtain modified hollow glass microspheres. (4) Under nitrogen protection, 10.1 g of cashew phenol, 3.34 g of triethylamine, 0.03 g of 4-dimethylaminopyridine and 0.02 g of 4-methoxyphenol were added to 35 mL of dichloromethane solvent. The mixture was stirred evenly in an ice-water bath, and then 2.92 g of succinyl chloride was added dropwise. The reaction was carried out at 40 °C for 3 h. After the reaction was completed, the mixture was filtered, washed, and the solvent was removed by rotary evaporation to obtain intermediate 1. (5) Under nitrogen protection, 4.82 g of intermediate 1, 1.44 g of formic acid and 0.03 g of p-toluenesulfonic acid were added to 12 mL of toluene solvent, stirred and mixed, and then 7.88 g of hydrogen peroxide was added dropwise. The reaction was carried out at 55 °C for 5 h. After the reaction was completed, the mixture was washed and dried, and then rotary evaporated to obtain intermediate 2. (6) Add 3.02 g of intermediate 2 and 1.21 g of 2,6-diaminopyridine to 18 mL of N,N-dimethylformamide solution, stir and mix, then add 0.02 g of triethylamine, stir at 60 °C for 3 h, after the reaction is complete, remove the solvent by rotary evaporation, dry, and obtain modified cashew phenol; (7) Add 4 parts by weight of mesoporous silica nanopowder, 1 part by weight of titanium dioxide, 1 part by weight of modified hollow glass microspheres, and 0.5 parts by weight of dispersant BYK-161 to 12 parts by weight of deionized water in sequence. Stir continuously at 1500 rpm for 20 min to obtain a slurry. Add 40 parts by weight of silicone acrylic emulsion, 2 parts by weight of modified cashew nut shell powder, 0.4 parts by weight of thickener RW-8W, and 0.3 parts by weight of defoamer BYK-024 to the slurry. Continue stirring for 15 min to obtain a heat insulation coating containing mesoporous nanomaterials.

[0021] Example 2 (1) Add 110 mL of 0.5 mol / L sodium hydroxide aqueous solution and 4.86 g of hollow glass microspheres to the reactor, stir and disperse, etch in a 95°C water bath for 2 h, let stand and filter to separate the product, wash until the washing solution is neutral, dry at 90°C for 6 h to obtain surface hydroxylated hollow glass microspheres. (2) Add 100 mL of 90% ethanol-water solution and 3.08 g of surface hydroxylated hollow glass microspheres to the reactor, stir and disperse, heat to reflux in a water bath at 100 °C, and then add 0.4 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane dropwise. React under reflux for 5 h. After the reaction is completed, filter, wash and dry to obtain epoxidized hollow glass microspheres. (3) Under nitrogen protection, 2.06 g of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, 2.45 g of epoxidized hollow glass microspheres and 0.03 g of sodium hydroxide were added to 115 mL of xylene solution. The reaction was carried out at 95 °C for 8 h. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to neutral with 0.1 mol / L dilute hydrochloric acid solution. The mixture was filtered, washed and dried to obtain modified hollow glass microspheres. (4) Under nitrogen protection, 10.3 g of cashew phenol, 3.38 g of triethylamine, 0.04 g of 4-dimethylaminopyridine and 0.03 g of 4-methoxyphenol were added to 40 mL of dichloromethane solvent. The mixture was stirred evenly in an ice-water bath, and then 2.96 g of succinyl chloride was added dropwise. The reaction was carried out at 50 °C for 5 h. After the reaction was completed, the mixture was filtered, washed, and the solvent was removed by rotary evaporation to obtain intermediate 1. (5) Under nitrogen protection, 4.86 g of intermediate 1, 1.48 g of formic acid and 0.04 g of p-toluenesulfonic acid were added to 15 mL of toluene solvent, stirred and mixed, and then 7.92 g of hydrogen peroxide was added dropwise. The reaction was carried out at 65 °C for 8 h. After the reaction was completed, the mixture was washed and dried, and then rotary evaporated to obtain intermediate 2. (6) Add 3.06 g of intermediate 2 and 1.25 g of 2,6-diaminopyridine to 20 mL of N,N-dimethylformamide solution, stir and mix, then add 0.03 g of triethylamine, stir at 80 °C for 5 h, after the reaction is complete, remove the solvent by rotary evaporation, dry, and obtain modified cashew phenol; (7) 6 parts by weight of mesoporous silica nanopowder, 2 parts by weight of titanium dioxide, 3 parts by weight of modified hollow glass microspheres, and 0.8 parts by weight of dispersant BYK-161 were added to 15 parts by weight of deionized water and stirred continuously at 2000 rpm for 30 min to obtain a slurry. 50 parts by weight of silicone acrylic emulsion, 4 parts by weight of modified cashew nut shell powder, 0.6 parts by weight of thickener RW-8W, and 0.5 parts by weight of defoamer BYK-024 were added to the slurry and stirred for 25 min to obtain a heat-insulating coating containing mesoporous nanomaterials.

[0022] Example 3 (1) Add 105 mL of 0.5 mol / L sodium hydroxide aqueous solution and 4.84 g of hollow glass microspheres to the reactor, stir and disperse, etch in a 90℃ water bath for 1.8 h, let stand and filter to separate the product, wash until the washing solution is neutral, dry at 85℃ for 5 h to obtain surface hydroxylated hollow glass microspheres. (2) Add 95 mL of 90% ethanol-water solution and 3.06 g of surface hydroxylated hollow glass microspheres to the reactor, stir and disperse, heat to reflux in a water bath at 90 °C, and then add 0.35 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane dropwise. React under reflux for 4 h. After the reaction is completed, filter, wash and dry to obtain epoxidized hollow glass microspheres. (3) Under nitrogen protection, 2.04 g of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, 2.43 g of epoxidized hollow glass microspheres and 0.02 g of sodium hydroxide were added to 112 mL of xylene solution. The reaction was carried out at 90 °C for 7 h. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to neutral with 0.1 mol / L dilute hydrochloric acid solution. The mixture was filtered, washed and dried to obtain modified hollow glass microspheres. (4) Under nitrogen protection, 10.2 g of cashew phenol, 3.36 g of triethylamine, 0.03 g of 4-dimethylaminopyridine and 0.02 g of 4-methoxyphenol were added to 38 mL of dichloromethane solvent. The mixture was stirred evenly in an ice-water bath, and then 2.94 g of succinyl chloride was added dropwise. The reaction was carried out at 45 °C for 4 h. After the reaction was completed, the mixture was filtered, washed, and the solvent was removed by rotary evaporation to obtain intermediate 1. (5) Under nitrogen protection, 4.84 g of intermediate 1, 1.46 g of formic acid and 0.03 g of p-toluenesulfonic acid were added to 13 mL of toluene solvent, stirred and mixed, and then 7.9 g of hydrogen peroxide was added dropwise. The reaction was carried out at 60 °C for 6 h. After the reaction was completed, the mixture was washed and dried, and then rotary evaporated to obtain intermediate 2. (6) Add 3.04 g of intermediate 2 and 1.23 g of 2,6-diaminopyridine to 19 mL of N,N-dimethylformamide solution, stir and mix, then add 0.02 g of triethylamine, stir at 70 °C for 4 h, after the reaction is complete, remove the solvent by rotary evaporation, dry, and obtain modified cashew phenol; (7) 5 parts by weight of mesoporous silica nanopowder, 1.5 parts by weight of titanium dioxide, 2 parts by weight of modified hollow glass microspheres, and 0.6 parts by weight of dispersant BYK-161 were added to 13 parts by weight of deionized water and stirred continuously at 1700 rpm for 25 min to obtain a slurry. 45 parts by weight of silicone acrylic emulsion, 3 parts by weight of modified cashew nut shell powder, 0.5 parts by weight of thickener RW-8W, and 0.4 parts by weight of defoamer BYK-024 were added to the slurry and stirred for another 20 min to obtain a heat-insulating coating containing mesoporous nanomaterials.

[0023] Example 4 (1) Add 102 mL of 0.5 mol / L sodium hydroxide aqueous solution and 4.83 g of hollow glass microspheres to the reactor, stir and disperse, etch in an 88℃ water bath for 1.5 h, let stand and filter to separate the product, wash until the washing solution is neutral, dry at 82℃ for 4 h to obtain surface hydroxylated hollow glass microspheres. (2) Add 92 mL of 90% ethanol-water solution and 3.05 g of surface hydroxylated hollow glass microspheres to the reactor, stir and disperse, heat to reflux in a water bath at 85 °C, and then add 0.32 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane dropwise. React under reflux for 3 h. After the reaction is completed, filter, wash and dry to obtain epoxidized hollow glass microspheres. (3) Under nitrogen protection, 2.03 g of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, 2.42 g of epoxidized hollow glass microspheres and 0.02 g of sodium hydroxide were added to 111 mL of xylene solution. The reaction was carried out at 88 °C for 6 h. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to neutral with 0.1 mol / L dilute hydrochloric acid solution. The mixture was filtered, washed and dried to obtain modified hollow glass microspheres. (4) Under nitrogen protection, 10.15 g of cashew phenol, 3.35 g of triethylamine, 0.03 g of 4-dimethylaminopyridine and 0.02 g of 4-methoxyphenol were added to 36 mL of dichloromethane solvent. The mixture was stirred evenly in an ice-water bath, and then 2.93 g of succinyl chloride was added dropwise. The reaction was carried out at 42 °C for 3 h. After the reaction was completed, the mixture was filtered, washed, and the solvent was removed by rotary evaporation to obtain intermediate 1. (5) Under nitrogen protection, 4.83 g of intermediate 1, 1.45 g of formic acid and 0.03 g of p-toluenesulfonic acid were added to 13 mL of toluene solvent, stirred and mixed, and then 7.89 g of hydrogen peroxide was added dropwise. The reaction was carried out at 58 °C for 6 h. After the reaction was completed, the mixture was washed and dried, and then rotary evaporated to obtain intermediate 2. (6) Add 3.03 g of intermediate 2 and 1.22 g of 2,6-diaminopyridine to 18 mL of N,N-dimethylformamide solution, stir and mix, then add 0.02 g of triethylamine, stir at 65 °C for 3 h, after the reaction is complete, remove the solvent by rotary evaporation, dry, and obtain modified cashew phenol; (7) Add 4 parts by weight of mesoporous silica nanopowder, 1 part by weight of titanium dioxide, 1 part by weight of modified hollow glass microspheres, and 0.6 parts by weight of dispersant BYK-161 to 13 parts by weight of deionized water in sequence. Stir continuously at 1600 rpm for 22 min to obtain a slurry. Add 42 parts by weight of silicone acrylic emulsion, 2 parts by weight of modified cashew nut shell powder, 0.4 parts by weight of thickener RW-8W, and 0.4 parts by weight of defoamer BYK-024 to the slurry. Continue stirring for 18 min to obtain a heat insulation coating containing mesoporous nanomaterials.

[0024] Example 5 (1) Add 108 mL of 0.5 mol / L sodium hydroxide aqueous solution and 4.85 g of hollow glass microspheres to the reactor, stir and disperse, etch in a 92℃ water bath for 2 h, let stand and filter to separate the product, wash until the washing solution is neutral, and dry at 88℃ for 6 h to obtain surface hydroxylated hollow glass microspheres. (2) Add 98 mL of 90% ethanol-water solution and 3.07 g of surface hydroxylated hollow glass microspheres to the reactor, stir and disperse, heat to reflux in a water bath at 95 °C, and then add 0.38 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane dropwise. React under reflux for 5 h. After the reaction is completed, filter, wash and dry to obtain epoxidized hollow glass microspheres. (3) Under nitrogen protection, 2.05 g of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, 2.44 g of epoxidized hollow glass microspheres and 0.03 g of sodium hydroxide were added to 114 mL of xylene solution. The reaction was carried out at 92 °C for 8 h. After the reaction was completed, the mixture was cooled to room temperature and the pH was adjusted to neutral with 0.1 mol / L dilute hydrochloric acid solution. The mixture was filtered, washed and dried to obtain modified hollow glass microspheres. (4) Under nitrogen protection, 10.25 g of cashew phenol, 3.37 g of triethylamine, 0.04 g of 4-dimethylaminopyridine and 0.03 g of 4-methoxyphenol were added to 38 mL of dichloromethane solvent. The mixture was stirred evenly in an ice-water bath, and then 2.95 g of succinyl chloride was added dropwise. The reaction was carried out at 48 °C for 5 h. After the reaction was completed, the mixture was filtered, washed, and the solvent was removed by rotary evaporation to obtain intermediate 1. (5) Under nitrogen protection, 4.85 g of intermediate 1, 1.47 g of formic acid and 0.04 g of p-toluenesulfonic acid were added to 14 mL of toluene solvent, stirred and mixed, and then 7.91 g of hydrogen peroxide was added dropwise. The reaction was carried out at 62 °C for 7 h. After the reaction was completed, the mixture was washed and dried, and then rotary evaporated to obtain intermediate 2. (6) Add 3.05 g of intermediate 2 and 1.24 g of 2,6-diaminopyridine to 20 mL of N,N-dimethylformamide solution, stir and mix, then add 0.03 g of triethylamine, stir at 75 °C for 5 h, after the reaction is complete, remove the solvent by rotary evaporation, dry, and obtain modified cashew phenol; (7) 6 parts by weight of mesoporous silica nanopowder, 2 parts by weight of titanium dioxide, 3 parts by weight of modified hollow glass microspheres, and 0.7 parts by weight of dispersant BYK-161 were added to 14 parts by weight of deionized water and stirred continuously at 1800 rpm for 28 min to obtain a slurry. 48 parts by weight of silicone acrylic emulsion, 4 parts by weight of modified cashew nut shell powder, 0.6 parts by weight of thickener RW-8W, and 0.5 parts by weight of defoamer BYK-024 were added to the slurry and stirred for 22 min to obtain a heat-insulating coating containing mesoporous nanomaterials.

[0025] Comparative Example 1 The difference between this comparative example and Example 5 is that hollow glass microspheres were used instead of modified hollow glass microspheres.

[0026] Comparative Example 2 The difference between this comparative example and Example 5 is that cashew phenol is used instead of modified cashew phenol.

[0027] Performance testing: The performance of the heat-insulating coatings prepared in Examples 1-5 and Comparative Examples 1-2 was tested.

[0028] Coating preparation: Seven plywood pieces with dimensions of 100mm×100mm×5mm were taken as substrates, placed in a forced-air drying oven, and dried at 60℃ for 2 hours for later use. The heat insulation coatings prepared in Examples 1-5 and Comparative Examples 1-2 were uniformly sprayed onto the surface of the sample to form a coating with a thickness of 100μm.

[0029] (1) Thermal insulation performance test: The thermal conductivity was determined according to GB / T10295-2008 "Standard for Testing Thermal Conductivity of Thermal Insulation Materials". The test results are shown in Table 1.

[0030] Table 1: Thermal insulation performance test.

[0031] project Thermal conductivity W / (m·K) Example 1 0.037 Example 2 0.044 Example 3 0.040 Example 4 0.039 Example 5 0.042 Comparative Example 1 0.083 Comparative Example 2 0.072 As can be seen from Table 1, the heat insulation coatings prepared in Examples 1-5 have lower thermal conductivity and better heat insulation performance.

[0032] (2) Weather resistance test: The stability of the coating under simulated natural light and humidity alternation was tested by QUV accelerated aging test (aging time 1000h), including whether there were deterioration phenomena such as chalking, cracking, and discoloration. The test results are shown in Table 2.

[0033] Table 2: Weather resistance test.

[0034] project Weather resistance (QUV 1000h) Example 1 No change in coating Example 2 No change in coating Example 3 No change in coating Example 4 No change in coating Example 5 No change in coating Comparative Example 1 A small amount of chalking occurred in the coating. Comparative Example 2 Slight chalking of the coating As can be seen from Table 2, the heat insulation coatings prepared in Examples 1-5 have better weather resistance.

[0035] (3) Corrosion resistance test: The corrosion resistance of the prepared plywood coating was tested under the following conditions: immersion in 20% sulfuric acid, immersion in 20% sodium hydroxide, and immersion in 5% sodium chloride salt spray. The test results are shown in Table 3.

[0036] Table 3: Corrosion resistance test.

[0037] project <![CDATA[20%H2SO 4, 2000h]]> 20% NaOH, 2000h 5% NaCl, 5000h Example 1 No abnormalities No abnormalities No abnormalities Example 2 No abnormalities No abnormalities No abnormalities Example 3 No abnormalities No abnormalities No abnormalities Example 4 No abnormalities No abnormalities No abnormalities Example 5 No abnormalities No abnormalities No abnormalities Comparative Example 1 Slightly bubbly Slightly bubbly Slight blistering and rust Comparative Example 2 Slightly bubbly Slightly bubbly Slight blistering and rust As can be seen from Table 3, the heat insulation coatings prepared in Examples 1-5 have better anti-corrosion performance.

[0038] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0040] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments. It should be noted that many modifications and improvements can be made by those skilled in the art, and all modifications or improvements not exceeding the scope of the claims should be considered within the protection scope of the present invention.

Claims

1. A heat-insulating coating containing mesoporous nanomaterials, characterized in that, It comprises the following components by weight: 40-50 parts by weight of silicone-acrylic emulsion, 4-6 parts by weight of mesoporous silica nanoparticles, 1-3 parts by weight of modified hollow glass microspheres, 2-4 parts by weight of modified cashew nut shell powder, 1-2 parts by weight of titanium dioxide, 0.5-0.8 parts by weight of dispersant BYK-161, 0.3-0.5 parts by weight of defoamer BYK-024, 0.4-0.6 parts by weight of thickener RW-8W, and 12-15 parts by weight of deionized water.

2. The heat-insulating coating containing mesoporous nanomaterials according to claim 1, characterized in that, The method for preparing the modified hollow glass microspheres is as follows: Step 1: Add 0.5 mol / L sodium hydroxide aqueous solution and hollow glass microspheres to the reactor, stir and disperse, etch in a water bath at 85-95℃ for 1.5-2 hours, let stand and filter to separate the product, wash until the washing solution is neutral, and dry at 80-90℃ for 4-6 hours to obtain surface hydroxylated hollow glass microspheres. Step 2: Add 90% ethanol-water solution and surface hydroxylated hollow glass microspheres to the reactor, stir and disperse, heat to reflux in a water bath at 80-100℃, then add γ-(2,3-epoxypropoxy)propyltrimethoxysilane dropwise, react under reflux for 3-5 hours, after the reaction is completed, filter, wash and dry to obtain epoxidized hollow glass microspheres; Step 3: Under nitrogen protection, 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, epoxidized hollow glass microspheres, and sodium hydroxide were added to the xylene solution. The reaction was carried out at 85-95℃ for 6-8 hours. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to neutral with 0.1 mol / L dilute hydrochloric acid solution. The mixture was then filtered, washed, and dried to obtain the modified hollow glass microspheres.

3. The heat-insulating coating containing mesoporous nanomaterials according to claim 2, characterized in that, In step one, the ratio of sodium hydroxide aqueous solution to hollow glass microspheres is 100-110 mL: 4.82-4.86 g.

4. The heat-insulating coating containing mesoporous nanomaterials according to claim 2, characterized in that, In step two, the ratio of ethanol-water solution, surface-hydroxylated hollow glass microspheres, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 90-100 mL: 3.04-3.08 g: 0.3-0.4 g.

5. The heat-insulating coating containing mesoporous nanomaterials according to claim 2, characterized in that, In step three, the ratio of xylene, 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, epoxidized hollow glass microspheres, and sodium hydroxide is 110-115 mL: 2.02-2.06 g: 2.41-2.45 g: 0.02-0.03 g.

6. The heat-insulating coating containing mesoporous nanomaterials according to claim 1, characterized in that, The method for preparing the modified cashew phenol is as follows: S1: Under nitrogen protection, cashew phenol, triethylamine, 4-dimethylaminopyridine and 4-methoxyphenol were added to dichloromethane solvent and stirred evenly in an ice-water bath. Then, succinyl chloride was added dropwise and the reaction was carried out at 40-50℃ for 3-5 hours. After the reaction was completed, the mixture was filtered, washed and the solvent was removed by rotary evaporation to obtain intermediate 1. S2: Under nitrogen protection, intermediate 1, formic acid, and p-toluenesulfonic acid were added to toluene solvent, stirred and mixed, and then hydrogen peroxide was added dropwise. The reaction was carried out at 55-65℃ for 5-8 hours. After the reaction was completed, the mixture was washed and dried, and then rotary evaporated to obtain intermediate 2. S3: Add intermediate 2,2,6-diaminopyridine to N,N-dimethylformamide solution, stir and mix, then add triethylamine, stir at 60-80℃ for 3-5 h, after the reaction is complete, remove the solvent by rotary evaporation, dry to obtain modified cashew phenol.

7. The heat-insulating coating containing mesoporous nanomaterials according to claim 6, characterized in that, The ratio of dichloromethane, cashew phenol, triethylamine, 4-dimethylaminopyridine, 4-methoxyphenol, and succinyl chloride in S1 is 35-40 mL: 10.1-10.3 g: 3.34-3.38 g: 0.03-0.04 g: 0.02-0.03 g: 2.92-2.96 g.

8. The heat-insulating coating containing mesoporous nanomaterials according to claim 6, characterized in that, The ratio of toluene, intermediate 1, formic acid, p-toluenesulfonic acid, and hydrogen peroxide in S2 is 12-15 mL: 4.82-4.86 g: 1.44-1.48 g: 0.03-0.04 g: 7.88-7.92 g.

9. The heat-insulating coating containing mesoporous nanomaterials according to claim 6, characterized in that, The ratio of N,N-dimethylformamide, intermediate 2,2,6-diaminopyridine, and triethylamine in S3 is 18-20 mL: 3.02-3.06 g: 1.21-1.25 g: 0.02-0.03 g.

10. A heat-insulating coating containing mesoporous nanomaterials as described in any one of claims 1-9, characterized in that, The preparation method of the heat-insulating coating containing mesoporous nanomaterials is as follows: mesoporous silica nanopowder, titanium dioxide, modified hollow glass microspheres, and dispersant BYK-161 are added sequentially to deionized water, and stirred continuously at 1500-2000 rpm for 20-30 min to obtain a slurry. Silicone-acrylic emulsion, modified cashew nut shell powder, thickener RW-8W, and defoamer BYK-024 are added to the slurry, and stirring is continued for 15-25 min to obtain the heat-insulating coating containing mesoporous nanomaterials.

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