An aqueous environmental protection coating containing silica gel and a manufacturing process thereof

Abstract

The application relates to the technical field of paint, and discloses a water-based environment-friendly paint containing silica gel and a manufacturing process thereof. The water-based environment-friendly paint is formed by mixing water-based acrylate emulsion as a film-forming material and silica gel, poplar fiber reinforcing material and the like as additives. The poplar fiber reinforcing material is prepared by modifying a continuous macromolecular structure with a naphthalene ring-hindered phenol alternating connection structure on the surface of poplar fiber. The macromolecular structure can form hydrogen bond association with ester groups in the acrylate molecular chain, promotes the poplar fiber to efficiently play a pulling role, improves the strength and hardness of the coating and the oxidation resistance, the silica gel has rich pore structure, can realize heat blocking, improves the heat preservation and heat insulation effect of the paint, and by using part of low-cost fillers, the cost is reduced, the film-forming strength of the paint is improved, and the whole water-based paint formula system uses water as a solvent, meets the environmental protection requirements.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a water-based environmentally friendly coating containing silica gel and its manufacturing process. Background Technology

[0002] In the process of urbanization, building exteriors and glass often require coatings to achieve thermal insulation. Currently, existing thermal insulation coatings mainly achieve insulation by increasing the coating thickness, using a passive, barrier-like approach. This method often reduces the safety of the coating and has drawbacks in practical applications, such as excessive coating thickness, easy peeling, difficulty in repair after peeling, and easy cracking of the coating film. Therefore, it is not practical. Moreover, with the increasing emphasis on environmental protection, traditional solvent-based coatings have been gradually phased out of the market due to their significant pollution. Therefore, researching and developing a new type of environmentally friendly building thermal insulation coating that increases the temperature difference between indoors and outdoors, breaking through the traditional model of increasing coating thickness, and reducing air conditioning energy consumption in summer and heating energy consumption in winter, has significant economic, environmental, and social benefits for the development of the energy conservation and environmental protection industry.

[0003] Waterborne acrylic coatings have strong adhesion and have been increasingly used as architectural coatings in recent years. However, waterborne acrylic coatings have poor heat aging resistance and cannot withstand the thermo-oxidative aging caused by the large amount of heat accumulated on the surface under long-term sun exposure, which leads to coating peeling and loss of protective effect. In addition, waterborne acrylic coatings have low strength and are prone to cracking due to impacts, affecting the practicality of the coating. Therefore, the development of a high-performance waterborne acrylic coating is of great significance to the thermal insulation industry. Summary of the Invention

[0004] In order to solve the problems mentioned in the background art, the purpose of this invention is to provide a water-based environmentally friendly coating containing silica gel and its manufacturing process.

[0005] The objective of this invention can be achieved through the following technical solutions: A water-based environmentally friendly coating containing silica gel, comprising the following raw materials by weight: 55-75 parts of water-based acrylic emulsion; 5-10 parts of silica gel; Poplar fiber reinforcement 1.5-4 parts; 3-6 parts of hollow glass microspheres; 1-3 parts of nano titanium dioxide; 5-10 parts of light calcium carbonate; Dispersant 0.5-1 part; 0.5-1.5 parts wetting agent; Thickener 1-2 parts; 0.1-0.5 parts of defoamer; 60-80 parts deionized water.

[0006] As a further aspect of the present invention, the silica gel is prepared by the following method: A silicon source is added to a mixed solution of ethanol and deionized water, followed by the addition of an acid catalyst to adjust the pH to 3-5. After hydrolysis at 40-60℃ for 5-10 hours, an alkaline catalyst is added to adjust the pH to 8-10. After stirring evenly, the mixture is allowed to gel at 25-60℃. Then, it is immersed in ethanol at a controlled temperature of 40-60℃ for aging treatment for 10-18 hours before being discharged. The silica gel is obtained by supercritical drying.

[0007] As a further embodiment of the present invention, the silicon source is at least one of methyl orthosilicate, ethyl orthosilicate, methyltriethoxysilane, methyltriethoxysilane, and dimethyldiethoxysilane; the acid catalyst is at least one of hydrochloric acid, sulfuric acid, and methanesulfonic acid; and the base catalyst is at least one of sodium hydroxide, sodium bicarbonate, ammonia, and ammonium fluoride.

[0008] As a further aspect of the present invention, the preparation method of the poplar fiber reinforcement material includes the following steps: Step 1: Poplar fiber is added to 1,4-dioxane and ultrasonically dispersed until a uniform dispersion is formed. Then epichlorohydrin and phase transfer catalyst are added to the dispersion. The temperature is then raised to 70-75℃ and stirred for 1-2 hours. The temperature is then adjusted to 60-65℃, and sodium hydroxide solution is added to the dispersion. After the addition is complete, stirring is continued for 3-6 hours to obtain modified poplar fiber. Step 2: The modified poplar fiber is ultrasonically dispersed in toluene to form a uniform dispersion. Nitrogen gas is then introduced for protection. 2,2'-[1,6-naphthylbis(oxomethylene)]diepoxide is then added to the dispersion. After the addition is complete, the temperature is raised to 70-80℃ and kept at this temperature for 1-2 hours. Then, the thiolized hindered phenol derivative and triethylamine are added to the dispersion, and the temperature is further raised to 90-100℃. The mixture is kept at this temperature and stirred for 9-18 hours. Heating is then stopped, the material is cooled and discharged, and the solid material is separated by centrifugation. The solid material is then washed and vacuum dried to obtain the poplar fiber reinforced material.

[0009] As a further aspect of the present invention, in step one, the phase transfer catalyst is at least one of tetrabutylammonium hydrogen sulfate, tetramethylammonium bromide, tetramethylammonium chloride, or tetrabutylammonium bromide.

[0010] As a further aspect of the present invention, in step one, the mass fraction of the sodium hydroxide solution is 10-20%.

[0011] As a further aspect of the present invention, in step two, the thiolized hindered phenolic derivative is prepared by the following method: Step S1: Add α-lipoic acid to acetone. After the addition is complete, stir and mix well. Then add the composite catalyst and stir at room temperature for 30-40 min. Then add 3,5-di-tert-butyl-4-hydroxybenzyl alcohol. After the addition is complete, stir continuously at 35-40℃ for 2-4 h. Evaporate to remove the solvent and collect the product to obtain the intermediate. Step S2: Add the intermediate to tetrahydrofuran, stir and mix evenly, then add sodium borohydride under continuous stirring. After the addition is complete, adjust the temperature to 50-60℃, stir for 2-4 hours, evaporate to remove the solvent, collect the product, and purify it to obtain the thiolized hindered phenol derivative.

[0012] As a further aspect of the present invention, in step S1, the composite catalyst is a mixture of dicyclohexylcarbodiimide and 4-dimethylaminopyridine in a mass ratio of 1:0.2-0.3.

[0013] As a further aspect of the present invention, in step two, the mass ratio of the modified poplar fiber, 2,2'-[1,6-naphthylbis(oxomethylene)]diepoxide, and thiolated hindered phenolic derivative is 1:2-3.5:4-6.

[0014] In the above technical solution, the active hydroxyl groups on the surface of poplar fiber can react with epichlorohydrin under the action of phase transfer catalyst and sodium hydroxide, thereby modifying the surface of poplar fiber with epoxy groups to obtain modified poplar fiber. Then, 2,2'-[1,6-naphthylbis(oxomethylene)]diepoxide is used as a bridging agent and a thiolized hindered phenol derivative is used as a chain extender. Under the action of a catalyst, the epoxy substituents in their structures undergo continuous ring-opening addition with the active thiol functional groups, thereby carrying out in-situ polymerization on the surface of poplar fiber. This results in the poplar fiber surface being modified with a continuous macromolecular structure with alternating naphthalene ring-hindered phenol linkages, thus obtaining poplar fiber reinforcement.

[0015] The thiolized hindered phenol derivatives are prepared by condensation reaction of α-lipoic acid and 3,5-di-tert-butyl-4-hydroxybenzyl alcohol under the action of a composite catalyst to obtain an intermediate. Then, sodium borohydride is used to reduce the disulfide bond to obtain a hindered phenol derivative containing two equivalent active thiol functional groups in its structure, namely the thiolized hindered phenol derivatives.

[0016] A manufacturing process for a water-based environmentally friendly coating containing silica gel includes the following steps: Step 1: Add silica gel and dispersant to deionized water and ultrasonically disperse evenly to form an aerogel mixture; The second step is to add wetting agent and defoamer to the water-based acrylic emulsion, control the speed to 500-1000 r / min, stir and mix for 10-20 min, then add aerogel mixture and continue stirring for 20-40 min to form a premix. The third step is to add poplar fiber reinforcement, hollow glass microspheres, nano titanium dioxide and light calcium carbonate to the premix. Control the speed to 1000-1500 r / min and stir for 1-2 hours. Then add the thickener and stir until well mixed.

[0017] The beneficial effects of this invention are: (1) This invention prepares poplar fiber reinforcement by modifying the surface of poplar fibers with a continuous macromolecular structure of alternating naphthalene rings and hindered phenols. First, the macromolecular structure contains a large number of hydroxyl functional groups generated by ring-opening reactions, which can form hydrogen bonds with the ester groups in the acrylate molecular chain, thereby forming an intertwined network structure with the acrylate molecular chain. This allows the poplar fibers to exist in the network structure as cross-linked cores, forming a good stress dispersion system. When subjected to external forces, the tension of the poplar fibers themselves and the synergistic effect of the network structure can be used to achieve rapid transfer and absorption of the stress, thereby improving the strength of the coating. Second, the rigid benzene ring structure contained in the macromolecular structure can effectively improve the stability of the coating and effectively improve the hardness of the coating. The presence of the hindered phenol structure can effectively enhance the antioxidant properties of the coating and avoid the aging and peeling of the coating caused by high temperature.

[0018] (2) This invention uses silica gel as an additive to block heat by utilizing the rich pore structure of the gel. Furthermore, by using some low-cost fillers to replace some aerogel and poplar fiber reinforcement, the cost is reduced and the coating film strength is improved. Moreover, the entire water-based coating formulation system uses water as a solvent, which meets environmental protection requirements.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0021] Preparation Example 1 Preparation of silica gel: 1.2 g of methyl orthosilicate was added to a mixed solution of 10 mL of ethanol and 10 mL of deionized water. Then, 1 mol / L hydrochloric acid was added dropwise to adjust the pH to 4. After hydrolysis at 50 °C for 8 h, sodium hydroxide was added to adjust the pH to 10. After stirring evenly, the mixture was allowed to gel at 40 °C. Then, it was immersed in ethanol at 60 °C and aged for 16 h before being discharged. The silica gel was obtained by supercritical drying.

[0022] Preparation Example 2 Preparation of poplar fiber reinforcement: Step 1: Add 3.5g of poplar fiber to 1,4-dioxane and ultrasonically disperse until a uniform dispersion is formed. Then add 1.4g of epichlorohydrin and 0.1g of tetrabutylammonium bromide to the dispersion. Next, raise the temperature to 70℃ and stir for 2 hours. Then adjust the temperature to 65℃ and add 4mL of 15% sodium hydroxide solution to the dispersion. After the addition is complete, continue stirring for 4 hours to obtain modified poplar fiber. Step 2: 1.5g of modified poplar fiber was ultrasonically dispersed in toluene to form a uniform dispersion. Nitrogen gas was then introduced for protection. 5g of 2,2'-[1,6-naphthylbis(oxomethylene)]diepoxide was added to the dispersion. After the addition was complete, the temperature was raised to 75℃ and kept at that temperature for 1 hour. Then, 8g of thiolized hindered phenol derivative and 0.5g of triethylamine were added to the dispersion, and the temperature was further raised to 95℃. The mixture was kept at that temperature and stirred for 12 hours. Heating was then stopped, the material was cooled and discharged, and the solid material was separated by centrifugation. The solid material was then washed and vacuum dried to obtain poplar fiber reinforced material.

[0023] The thiol-treated hindered phenolic derivatives were prepared using the following method: Step S1: Add 0.5g of α-lipoic acid to acetone. After the addition is complete, stir and mix well. Then add 0.2g of dicyclohexylcarbodiimide and 0.05g of 4-dimethylaminopyridine. Stir at room temperature for 30min. Then add 0.57g of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol. After the addition is complete, stir continuously at 40℃ for 3h. Evaporate to remove the solvent and collect the product to obtain the intermediate. Step S2: Add 0.6g of intermediate to tetrahydrofuran, stir and mix evenly, then add 0.2g of sodium borohydride under continuous stirring. After the addition is complete, adjust the temperature to 55℃, stir for 3h, evaporate to remove the solvent, collect the product, and purify it to obtain the thiol-hindered phenol derivative.

[0024] Example 1 A water-based environmentally friendly coating containing silica gel, comprising the following raw materials by weight: 55 parts of water-based acrylic emulsion; Five portions of silica gel; 1.5 parts of poplar fiber reinforcement; Three portions of hollow glass microspheres; 1 part of nano titanium dioxide; Five parts of light calcium carbonate; 0.5 parts dispersant; 0.5 parts wetting agent; Thickener 1 part; 0.1 parts of defoamer; 60 parts of deionized water.

[0025] The preparation method of the water-based environmentally friendly coating includes the following steps: Step 1: Add silica gel and dispersant to deionized water and ultrasonically disperse evenly to form an aerogel mixture; The second step is to add wetting agent and defoamer to the water-based acrylic emulsion, control the speed to 500 r / min, stir and mix for 20 min, then add aerogel mixture and continue stirring for 40 min to form a premix. The third step is to add poplar fiber reinforcement, hollow glass microspheres, nano titanium dioxide and light calcium carbonate to the premix. Control the speed at 1000 r / min and stir for 2 hours. Then add the thickener and stir until well mixed.

[0026] The preparation method of silica gel is shown in Preparation Example 1; the preparation method of poplar fiber reinforcement is shown in Preparation Example 2; the dispersant is polycarboxylic acid ammonium salt dispersant; the wetting agent is PE-100; the thickener is TT935; the defoamer is DIG825; the following are all the same.

[0027] Example 2 A water-based environmentally friendly coating containing silica gel, comprising the following raw materials by weight: 60 parts of water-based acrylic emulsion; Eight portions of silica gel; 3.5 parts of poplar fiber reinforcement; Four portions of hollow glass microspheres; Two parts of nano-titanium dioxide; 6 parts of light calcium carbonate; 0.6 parts dispersant; 1 part wetting agent; Thickener 1.5 parts; 0.2 parts of defoamer; 70 parts of deionized water.

[0028] The preparation method of the water-based environmentally friendly coating includes the following steps: Step 1: Add silica gel and dispersant to deionized water and ultrasonically disperse evenly to form an aerogel mixture; The second step is to add wetting agent and defoamer to the water-based acrylic emulsion, control the speed to 800 r / min, stir and mix for 15 min, then add aerogel mixture and continue stirring for 30 min to form a premix. The third step is to add poplar fiber reinforcement, hollow glass microspheres, nano titanium dioxide and light calcium carbonate to the premix. Control the speed to 1200 r / min and stir for 1 hour. Then add the thickener and stir until well mixed.

[0029] Example 3 A water-based environmentally friendly coating containing silica gel, comprising the following raw materials by weight: 75 parts of water-based acrylic emulsion; 10 portions of silica gel; 4 parts of poplar fiber reinforcement; Six portions of hollow glass microspheres; 3 parts of nano-titanium dioxide; 10 parts of light calcium carbonate; 1 part dispersant; 1.5 parts wetting agent; Thickener 2 parts; 0.5 parts of defoamer; 80 parts of deionized water.

[0030] The preparation method of the water-based environmentally friendly coating includes the following steps: Step 1: Add silica gel and dispersant to deionized water and ultrasonically disperse evenly to form an aerogel mixture; The second step is to add wetting agent and defoamer to the water-based acrylic emulsion, control the speed to 1000 r / min, stir and mix for 10 min, then add aerogel mixture and continue stirring for 20 min to form a premix. The third step is to add poplar fiber reinforcement, hollow glass microspheres, nano titanium dioxide and light calcium carbonate to the premix. Control the speed at 1500 r / min and stir for 1 hour. Then add the thickener and stir until well mixed.

[0031] Comparative Example 1 A water-based environmentally friendly coating containing silica gel, comprising the following raw materials by weight: 60 parts of water-based acrylic emulsion; Eight portions of silica gel; Poplar fiber 3.5 parts; Four portions of hollow glass microspheres; Two parts of nano-titanium dioxide; 6 parts of light calcium carbonate; 0.6 parts dispersant; 1 part wetting agent; Thickener 1.5 parts; 0.2 parts of defoamer; 70 parts of deionized water.

[0032] The preparation method of the water-based environmentally friendly coating includes the following steps: Step 1: Add silica gel and dispersant to deionized water and ultrasonically disperse evenly to form an aerogel mixture; The second step is to add wetting agent and defoamer to the water-based acrylic emulsion, control the speed to 800 r / min, stir and mix for 15 min, then add aerogel mixture and continue stirring for 30 min to form a premix. The third step is to add poplar fiber, hollow glass microspheres, nano titanium dioxide and light calcium carbonate to the premix. Control the speed to 1200 r / min and stir for 1 hour. Then add the thickener and stir until well mixed.

[0033] Comparative Example 2 A water-based environmentally friendly coating containing silica gel, comprising the following raw materials by weight: 60 parts of water-based acrylic emulsion; Eight portions of silica gel; Four portions of hollow glass microspheres; Two parts of nano-titanium dioxide; 6 parts of light calcium carbonate; 0.6 parts dispersant; 1 part wetting agent; Thickener 1.5 parts; 0.2 parts of defoamer; 70 parts of deionized water.

[0034] The preparation method of the water-based environmentally friendly coating includes the following steps: Step 1: Add silica gel and dispersant to deionized water and ultrasonically disperse evenly to form an aerogel mixture; The second step is to add wetting agent and defoamer to the water-based acrylic emulsion, control the speed to 800 r / min, stir and mix for 15 min, then add aerogel mixture and continue stirring for 30 min to form a premix. The third step is to add hollow glass microspheres, nano titanium dioxide, and light calcium carbonate to the premix. Control the speed at 1200 r / min and stir for 1 hour. Then add the thickener and stir until well mixed.

[0035] Test case The coatings used in the examples and comparative examples were prepared into various coating test samples, and various performance tests were conducted: Thermal conductivity was tested according to GB / T 10294-2008; Impact performance testing was conducted according to GB / T 1732-2020; Hardness testing was conducted according to GB / T 6739-2006; The sample was placed in an oven at 120℃ for 12 hours for accelerated aging treatment, and then taken out to observe the phenomenon and evaluate the antioxidant performance of the coating. The test results are shown in the table below: Table 1 - Test Results Analysis of the test results shows that the coating formed after curing of the coating prepared in the embodiments of the present invention exhibits excellent performance in all aspects. After replacing the modified poplar fiber with unmodified poplar fiber, on the one hand, the interaction force between the modified poplar fiber and the acrylate molecular chain is poor, making it difficult to effectively exert its own traction and reinforcement effect, resulting in a significant decrease in strength and hardness. On the other hand, the macromolecular structure is lost, so the coating does not contain antioxidants, which leads to a significant reduction in the antioxidant performance of the coating.

[0036] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

[0037] 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 will 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.

Claims

1. A water-based environmentally friendly coating containing silica gel, characterized in that, By weight, it includes the following ingredients: 55-75 parts of water-based acrylic emulsion; 5-10 parts of silica gel; Poplar fiber reinforcement 1.5-4 parts; 3-6 parts of hollow glass microspheres; 1-3 parts of nano titanium dioxide; 5-10 parts of light calcium carbonate; Dispersant 0.5-1 part; 0.5-1.5 parts wetting agent; Thickener 1-2 parts; 0.1-0.5 parts of defoamer; 60-80 parts deionized water.

2. The water-based environmentally friendly coating containing silica gel according to claim 1, characterized in that, The silica gel was prepared using the following method: A silicon source is added to a mixed solution of ethanol and deionized water, followed by the addition of an acid catalyst to adjust the pH to 3-5. After hydrolysis at 40-60℃ for 5-10 hours, an alkaline catalyst is added to adjust the pH to 8-10. After stirring evenly, the mixture is allowed to gel at 25-60℃. Then, it is immersed in ethanol at a controlled temperature of 40-60℃ for aging treatment for 10-18 hours before being discharged. The silica gel is obtained by supercritical drying.

3. The water-based environmentally friendly coating containing silica gel according to claim 2, characterized in that, The silicon source is at least one of methyl orthosilicate, ethyl orthosilicate, methyltriethoxysilane, methyltriethoxysilane, and dimethyldiethoxysilane; the acid catalyst is at least one of hydrochloric acid, sulfuric acid, and methanesulfonic acid; and the base catalyst is at least one of sodium hydroxide, sodium bicarbonate, ammonia, and ammonium fluoride.

4. The water-based environmentally friendly coating containing silica gel according to claim 1, characterized in that, The preparation method of the poplar fiber reinforced material includes the following steps: Step 1: Poplar fiber is added to 1,4-dioxane and ultrasonically dispersed until a uniform dispersion is formed. Then epichlorohydrin and phase transfer catalyst are added to the dispersion. The temperature is then raised to 70-75℃ and stirred for 1-2 hours. The temperature is then adjusted to 60-65℃, and sodium hydroxide solution is added to the dispersion. After the addition is complete, stirring is continued for 3-6 hours to obtain modified poplar fiber. Step 2: The modified poplar fiber is ultrasonically dispersed in toluene to form a uniform dispersion. Nitrogen gas is then introduced for protection. 2,2'-[1,6-naphthylbis(oxomethylene)]diepoxide is then added to the dispersion. After the addition is complete, the temperature is raised to 70-80℃ and kept at this temperature for 1-2 hours. Then, the thiolized hindered phenol derivative and triethylamine are added to the dispersion, and the temperature is further raised to 90-100℃. The mixture is kept at this temperature and stirred for 9-18 hours. Heating is then stopped, the material is cooled and discharged, and the solid material is separated by centrifugation. The solid material is then washed and vacuum dried to obtain the poplar fiber reinforced material.

5. The water-based environmentally friendly coating containing silica gel according to claim 4, characterized in that, In step one, the phase transfer catalyst is at least one of tetrabutylammonium hydrogen sulfate, tetramethylammonium bromide, tetramethylammonium chloride, or tetrabutylammonium bromide.

6. The water-based environmentally friendly coating containing silica gel according to claim 4, characterized in that, In step one, the sodium hydroxide solution has a mass fraction of 10-20%.

7. The water-based environmentally friendly coating containing silica gel according to claim 4, characterized in that, In step two, the thiolized hindered phenolic derivative is prepared using the following method: Step S1: Add α-lipoic acid to acetone. After the addition is complete, stir and mix well. Then add the composite catalyst and stir at room temperature for 30-40 min. Then add 3,5-di-tert-butyl-4-hydroxybenzyl alcohol. After the addition is complete, stir continuously at 35-40℃ for 2-4 h. Evaporate to remove the solvent and collect the product to obtain the intermediate. Step S2: Add the intermediate to tetrahydrofuran, stir and mix evenly, then add sodium borohydride under continuous stirring. After the addition is complete, adjust the temperature to 50-60℃, stir for 2-4 hours, evaporate to remove the solvent, collect the product, and purify it to obtain the thiolized hindered phenol derivative.

8. The water-based environmentally friendly coating containing silica gel according to claim 7, characterized in that, In step S1, the composite catalyst is a mixture of dicyclohexylcarbodiimide and 4-dimethylaminopyridine in a mass ratio of 1:0.2-0.

3.

9. The water-based environmentally friendly coating containing silica gel according to claim 4, characterized in that, In step two, the mass ratio of the modified poplar fiber, 2,2'-[1,6-naphthylbis(oxomethylene)]diepoxide, and thiolated hindered phenolic derivative is 1:2-3.5:4-6.

10. A manufacturing process for a water-based environmentally friendly coating containing silica gel, characterized in that, Includes the following steps: Step 1: Add silica gel and dispersant to deionized water and ultrasonically disperse evenly to form an aerogel mixture; The second step is to add wetting agent and defoamer to the water-based acrylic emulsion, control the speed to 500-1000 r / min, stir and mix for 10-20 min, then add aerogel mixture and continue stirring for 20-40 min to form a premix. The third step is to add poplar fiber reinforcement, hollow glass microspheres, nano titanium dioxide and light calcium carbonate to the premix. Control the speed to 1000-1500 r / min and stir for 1-2 hours. Then add the thickener and stir until well mixed.

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