An efficient energy-saving coating based on aerogel and glass microbeads and a preparation method thereof

Abstract

The application belongs to the technical field of building coatings, and particularly relates to a high-efficiency energy-saving coating based on aerogel and glass beads and a preparation method thereof. The coating comprises deionized water, water-based unsaturated resin emulsion, glass beads, biochar-cellulose-based aerogel, rutile titanium dioxide, and selected suitable fillers and additives. The prepared coating has stable properties, low thermal conductivity, high temperature difference, and good heat insulation performance. Moreover, the coating has the advantages of fire resistance, high coating film strength, good toughness, water resistance, non-cracking, corrosion resistance, and non-mildew. Meanwhile, the coating has a fast solidification and film formation speed, can be constructed in a zero-degree environment, and is convenient to construct. In addition, the preparation method of the coating is simple, has low requirements on equipment, is low in cost, energy-saving, and consumption-reducing, and meets the requirements of energy saving and environmental protection in the field of coatings.

Description

Technical Field

[0001] The present invention belongs to the technical field of architectural coatings, and in particular relates to a high-efficiency energy-saving coating based on aerogels and glass microbeads and a preparation method thereof. Background Art

[0002] As global warming and energy depletion continue, environmental protection has become a top priority for countries worldwide. Energy conservation, consumption reduction, and improved economic efficiency are key goals. With the development of industry and the construction sector, building energy consumption is becoming an increasingly important component of overall energy consumption. Traditional coatings are no longer able to meet these energy conservation and environmental requirements. To ensure the steady growth of the construction industry, the development of energy-saving and environmentally friendly coatings is a major trend. Thermal insulation coatings, owing to their energy-saving, consumption-reducing, and water- and heat-insulating properties, are steadily increasing their share of the coatings market.

[0003] Thermal insulation coatings can be categorized as barrier, reflective, and radiant based on their insulation mechanisms and methods. Barrier coatings are rarely used on exterior building walls due to their long drying cycles and significant seasonal impact. Reflective coatings, on the other hand, can significantly shorten drying times and be less susceptible to seasonal impacts by selecting appropriate resin emulsions, pigments, and fillers, as well as adjusting the production process. These coatings can address or alleviate these issues. Their use on exterior walls can prevent heat conduction and reduce both the surface temperature of walls exposed to the sun and the internal ambient temperature.

[0004] In order to achieve the purpose of reflective insulation, common reflective thermal insulation coatings on the market often choose to add ingredients such as glass microbeads and ceramic microbeads. However, due to the limitations of the production process, there are often problems with microbead breakage, microbead floating, and increased viscosity, which affect the properties and performance of the coating. To solve this problem, the industry has introduced aerogels to prepare coatings, such as SiO2 aerogel or silicon aerogel, but these have corresponding problems such as complex preparation processes, high equipment requirements, and low yields, resulting in increased costs. Therefore, the development of an energy-saving coating with simple process, excellent performance, and low cost is still a direction that needs to be focused on. Summary of the Invention

[0005] In view of the defects and problems of complex process and high cost in the production of current energy-saving coatings, the present invention provides a high-efficiency energy-saving coating based on aerogel and glass microspheres and a preparation method.

[0006] The solution adopted by the present invention to solve its technical problem is: a high-efficiency and energy-saving coating based on aerogel and glass microspheres, comprising the following raw materials in parts by weight: 50-70 parts of aqueous unsaturated resin emulsion, 5-15 parts of glass microspheres, 5-15 parts of biochar-cellulose-based aerogel, 10-15 parts of rutile titanium dioxide, 10-20 parts of filler, 5-15 parts of additives, and 30-55 parts of deionized water.

[0007] The above-mentioned high-efficiency and energy-saving coating based on aerogel and glass microspheres includes the following raw materials in parts by weight: 60 parts of aqueous unsaturated resin emulsion, 10 parts of glass microspheres, 10 parts of biochar-cellulose-based aerogel, 10 parts of rutile titanium dioxide, 15 parts of filler, 10 parts of additives, and 50 parts of deionized water.

[0008] The above-mentioned high-efficiency energy-saving coating based on aerogel and glass microspheres, the filler includes 1-5 parts of wollastonite powder, 1-3 parts of talc powder, 2-5 parts of manganese oxide, 1-3 parts of expanded vermiculite, and 1-3 parts of kaolin.

[0009] The above-mentioned high-efficiency energy-saving coating based on aerogel and glass microspheres, the filler also includes 1-5 parts of glass flakes and 1-5 parts of fiber brucite.

[0010] The above-mentioned high-efficiency energy-saving coating based on aerogel and glass microspheres, the auxiliary agent includes 2-5 parts of dispersant, 1-5 parts of strong thixotropic thickener, and 1-5 parts of leveling agent.

[0011] The above-mentioned high-efficiency energy-saving coating based on aerogel and glass microspheres, wherein the glass microspheres are surface-modified glass microspheres coated with TiO2, is prepared by first surface-modifying the glass microspheres with an alkaline solution and then coating the surface of the glass microspheres with a layer of TiO2 using a chemical deposition method, in the following steps:

[0012] (1) Immerse the glass microspheres in a 0.3 mol / L NaOH solution and stir for 4 h, then rinse with clean water until neutral to obtain surface-modified glass microspheres;

[0013] (2) Weigh the modified glass microspheres, add distilled water, and dropwise add sodium dodecylbenzenesulfonate aqueous solution and stir; raise the temperature to 100°C, add NaOH dropwise to adjust the pH to 2-3, then dropwise add 10 wt% titanium sulfate solution, and simultaneously add NaOH dropwise to maintain a constant pH until the titanium sulfate solution is completely added;

[0014] (3) After filtering, washing, and drying, the mixture is calcined at 600°C to obtain surface-modified glass microspheres coated with TiO2.

[0015] The above-mentioned high-efficiency and energy-saving coating based on aerogel and glass microspheres, the aqueous unsaturated resin emulsion is an aqueous unsaturated polyester resin emulsion, which includes 100 parts of succinic acid type unsaturated polyester resin, 100 parts of deionized water, 10 parts of potassium hydroxide, 0.2 parts of silicone modified polyacrylate, and 0.2 parts of polyether ester defoamer.

[0016] The above-mentioned high-efficiency and energy-saving coating based on aerogel and glass microspheres, the preparation method of the biochar-cellulose-based aerogel comprises the following steps:

[0017] S1. Adding KOH to peanut shell biochar to obtain modified peanut shell biochar;

[0018] S2, dissolving sugarcane cellulose in a 10 wt % NaOH / 12 wt % urea aqueous solution to obtain a cellulose solution;

[0019] S3. Mix the cellulose solution and modified peanut shell biochar in a ratio of 1:1 and stir for 4-8 hours; then add 20% N'N-methylenebisacrylamide, continue stirring for 5 hours, and let stand at room temperature for 24 hours to form a hydrogel;

[0020] S4. Place the hydrogel in deionized water, adjust the pH to neutral, and then freeze-dry it in a freeze dryer for 48 hours to prepare a biochar-cellulose aerogel.

[0021] The present invention also provides a method for preparing a high-efficiency energy-saving coating based on aerogel and glass microspheres, comprising the following steps:

[0022] Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and filler in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve;

[0023] Step 2: Stir the deionized water and the mixed powder at a speed of 100-200 r / min for 20-30 min to obtain a mixed material;

[0024] Step 3: Stir the additive and the water-based unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 200-300 r / min for 1-3 hours to obtain the coating.

[0025] Beneficial effects of the present invention:

[0026] 1. The energy-saving coating of the present invention has a simple preparation process and low requirements on equipment. It integrates the performance of multiple components and has the advantages of fire resistance, heat insulation, high coating strength, good toughness, water resistance, not easy to crack, corrosion resistance, and mildew resistance. In addition, it has a fast curing film-forming speed and can be constructed in an environment of minus ten degrees, making construction convenient.

[0027] 2. The energy-saving coating of the present invention uses water-based unsaturated polyester resin emulsion, which can be cured at room temperature and low temperature, and has good flame retardancy. The flame retardancy effect of the coating can be improved by adding fillers. The unsaturated cross-linking monomer in the water-based unsaturated polyester resin emulsion can participate in the film-forming curing reaction of the resin together with other auxiliary agents, and is cured and formed by cross-linking curing. Compared with volatilization curing, it can ensure that the latex particles of the coating account for a large proportion, and ultimately increase the solid content, so that the coverage of the coating is better, the glossiness is high, the corrosion resistance is improved, and the film-forming effect of the coating is improved. Moreover, after the coating is film-formed, no organic solvent evaporates into the atmosphere, which will not cause damage to people and the environment, and is more environmentally friendly and safe.

[0028] 3. The present invention cleverly selects filler types and ratios, which can help improve the adhesion between the carbon in the resin's unsaturated cross-linking monomer and the substrate, increase the carbon expansion rate, and reduce the heat penetration of the heat source into the substrate; at the same time, the addition of phosphorus helps the formation of carbon, and a higher filler content and grinding time can increase the residual amount and fire resistance. The synergistic effect can strengthen the carbon layer, thereby delaying the time for the corrosive medium to penetrate the coating and reach the surface of the substrate, thereby greatly extending the service life of the substrate.

[0029] 4. The biochar-cellulose-based aerogel prepared by the present invention has a large number of mesoporous structures and a small number of macroporous structures, which form an interconnected three-dimensional network structure that can reflect light and heat. In addition, the large number of pore walls therein also lengthen the heat conduction path, reduce the thermal conductivity coefficient, and reduce heat conduction.

[0030] 5. The biochar-cellulose-based aerogel prepared by the present invention has biochar uniformly dispersed in the aerogel network structure, filling the three-dimensional porous structure. This can not only further enhance the strength of the network structure and improve its mechanical properties, but also prevent the porous structure from absorbing other substances in the raw materials, reduce the blockage of the pore structure, and ensure its thermal insulation performance.

[0031] 6. The peanut shell biochar and sugarcane cellulose used in the present invention are both recycled waste, further reducing production costs.

[0032] 7. The manganese oxide used in this invention is a doped substance with an inverse spinel structure. It has high thermal emissivity and infrared radiation capability, making it not only a filler in the coating but also a microwave absorber and photocatalyst. Fibrous brucite, on the other hand, has good water dispersibility. When added as a filler to the resin emulsion, it provides enhanced fiber toughness and resistance to breakage, improving the durability of the coating.

[0033] 8. The flaky glass flakes added in the present invention can be arranged parallel to or overlapped with each other in the coating to form a series of flake protection barriers, which delays the time for the corrosive medium to penetrate the coating and reach the surface of the substrate, thereby greatly extending the service life.

[0034] 9. This invention combines rutile titanium dioxide, a functional filler with high reflectivity and excellent thermal insulation properties, with glass microspheres through a special process to produce surface-modified glass microspheres coated with TiO2, further enhancing the thermal insulation effect of the coating. Rutile titanium dioxide not only effectively blocks sunlight but also absorbs ultraviolet rays. This significantly shields the coating from photothermal decomposition caused by ultraviolet rays, improving the coating's thermal insulation and durability. DETAILED DESCRIPTION

[0035] To address the current shortcomings and problems of complex processes and high costs in the production of energy-saving coatings, the present invention provides a high-efficiency, energy-saving coating based on aerogels and glass microspheres and a preparation method. The present invention is further described below with reference to examples.

[0036] Example 1: This example provides an energy-efficient coating based on aerogel and glass microspheres, comprising the following raw materials in parts by weight: 50 parts of aqueous unsaturated polyester resin emulsion, 10 parts of glass microspheres, 10 parts of biochar-cellulose-based aerogel, 15 parts of rutile titanium dioxide, 3 parts of wollastonite powder, 3 parts of talc powder, 3 parts of manganese oxide, 3 parts of expanded vermiculite, 3 parts of kaolin, 3 parts of nonionic dispersant, 2 parts of strong thixotropic thickener, 5 parts of leveling agent, and 40 parts of deionized water.

[0037] The glass microbeads used are surface-modified glass microbeads coated with TiO2. The glass microbeads are first surface-modified by an alkaline solution, and then a layer of TiO2 is coated on the surface of the glass microbeads by a chemical deposition method. The preparation method is as follows: first, the glass microbeads are immersed in a 0.3 mol / L NaOH solution and stirred for 4 hours, and then washed with clean water until neutral to obtain surface-modified glass microbeads; then the modified glass microbeads are weighed, distilled water is added, and a sodium dodecylbenzenesulfonate aqueous solution is dropped and stirred; the temperature is raised to 100°C, NaOH is added dropwise to adjust the pH to 2-3, and then 10wt% titanium sulfate solution is added dropwise, and NaOH is added dropwise at the same time to maintain a constant pH until the titanium sulfate solution is completely added; then, after filtering, washing, and drying, they are calcined at 600°C to obtain surface-modified glass microbeads coated with TiO2.

[0038] The aqueous unsaturated polyester resin emulsion used is an unsaturated polyester resin emulsion obtained by adding some additives to the compound, and its composition is: 100 parts of succinic acid type unsaturated polyester resin, 100 parts of deionized water, 10 parts of potassium hydroxide, 0.2 parts of silicone modified polyacrylate, and 0.2 parts of polyether ester defoamer. The resin emulsion can be cured under normal temperature and low temperature conditions, and has good flame retardancy. The combination of fillers can improve the flame retardant effect of the coating. The unsaturated cross-linking monomer in the aqueous unsaturated polyester resin emulsion can work together with other additives to participate in the film-forming curing reaction of the resin, and is cured and formed by cross-linking curing. Compared with volatile curing, it can ensure that the latex particles in the coating account for a large proportion, and ultimately increase the solid content, so that the coating has better coverage, high gloss, improved corrosion resistance, and improved film-forming effect of the coating. Moreover, after the coating is film-formed, no organic solvent evaporates into the atmosphere, which will not cause harm to people and the environment, and is more environmentally friendly and safe.

[0039] The biochar-cellulose-based aerogel used is a modified peanut shell biochar-cellulose-based aerogel, and the preparation includes the following steps:

[0040] S1. Adding KOH to peanut shell biochar to obtain modified peanut shell biochar;

[0041] S2, dissolving sugarcane cellulose in a 10 wt % NaOH / 12 wt % urea aqueous solution to obtain a cellulose solution;

[0042] S3. Mix the cellulose solution and modified peanut shell biochar in a ratio of 1:1 and stir for 4-8 hours; then add 20% N'N-methylenebisacrylamide, continue stirring for 5 hours, and let stand at room temperature for 24 hours to form a hydrogel;

[0043] S4. Place the hydrogel in deionized water, adjust the pH to neutral, and then freeze-dry it in a freeze dryer for 48 hours to prepare a biochar-cellulose aerogel.

[0044] This biochar-cellulose-based aerogel contains a large number of mesoporous structures and a small number of macroporous structures, which interweave to form an interconnected three-dimensional network structure that can reflect light and heat. The presence of a large number of pore walls also lengthens the heat conduction path, reducing the thermal conductivity and reducing heat conduction. Furthermore, the treated modified biochar is evenly dispersed within the aerogel network, filling the three-dimensional porous structure. This not only further strengthens the network structure and improves its mechanical properties, but also prevents the porous structure from adsorbing other substances from the raw materials, reduces pore blockage, and ensures its thermal insulation properties.

[0045] The manganese oxide used is an doped substance with an inverse spinel structure and has the characteristics of high thermal emissivity. It can realize the functions of filler, wave absorber and photocatalysis while radiating infrared rays. The rutile titanium dioxide used not only has a good blocking effect on sunlight, but also has a good absorption effect on ultraviolet rays. It can greatly shield the photothermal decomposition of the coating caused by ultraviolet rays and improve the durability of the coating.

[0046] The preparation method of the energy-saving coating of this embodiment is:

[0047] Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and fillers (including wollastonite powder, talc, manganese oxide, expanded vermiculite, and kaolin) in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve;

[0048] Step 2: Stir the deionized water and the mixed powder at a speed of 200 r / min for 25 min to obtain a mixed material;

[0049] Step 3: Stir the additives (including non-ionic dispersant, strong thixotropic thickener, leveling agent) and aqueous unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 300 r / min for 1.5 hours to obtain the coating.

[0050] Performance testing: The product of this embodiment was tested in accordance with GB / T9755-2014 "Synthetic Resin Emulsion Exterior Wall Paint." The coating prepared in this embodiment was a white, viscous liquid with no lumps in the container. After stirring, the slurry was uniformly dispersed. It was stable and did not deteriorate at low temperatures.

[0051] The coating drying time is 15 minutes, the coating appearance has no obvious shrinkage holes and sagging, and the coating is uniform.

[0052] Alkali resistance and water resistance tests showed that the coating films did not show any cracking, blistering or powdering.

[0053] The thermal insulation performance of the product of this embodiment was tested in accordance with GB / T25261-2018 "Reflective Thermal Insulation Coatings for Buildings", and its thermal conductivity was measured to be 0.041 W / m / K and the thermal insulation temperature difference was 17.3°C.

[0054] Example 2: The similarities between this example and Example 1 are not repeated here. The difference is that this example has some adjustments in the raw material composition and ratio. Specifically, it includes the following raw materials in parts by weight: 60 parts of aqueous unsaturated polyester resin emulsion, 15 parts of glass microspheres, 10 parts of biochar-cellulose-based aerogel, 10 parts of rutile titanium dioxide, 5 parts of wollastonite powder, 2 parts of talc, 5 parts of manganese oxide, 2 parts of expanded vermiculite, 2 parts of kaolin, 2 parts of glass flakes, 2 parts of fibrous brucite, 5 parts of non-ionic dispersant, 5 parts of strong thixotropic thickener, 5 parts of leveling agent, and 50 parts of deionized water.

[0055] The glass flakes used in the coating are arranged parallel or overlapping, forming a protective barrier that slows the penetration of corrosive media into the substrate surface, significantly extending its service life. The fiber brucite used is a low-toxic, non-carcinogenic mineral fiber with excellent splitting, hydrophilicity, and water dispersibility. Compared with inorganic fibers, it is easier to loosen during high-speed mixing and pulping, has excellent fiber toughness, and is less prone to breakage. It also offers improved biosafety.

[0056] The preparation method of the energy-saving coating of this embodiment is:

[0057] Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and fillers (including wollastonite powder, talc, manganese oxide, expanded vermiculite, kaolin, glass flakes, and fiber brucite) in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve;

[0058] Step 2: Stir the deionized water and the mixed powder at a speed of 150 r / min for 25 min to obtain a mixed material;

[0059] Step 3: Stir the additives (including non-ionic dispersant, strong thixotropic thickener, leveling agent) and aqueous unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 200 r / min for 2.5 hours to obtain the coating.

[0060] Performance testing: The product of this embodiment was tested in accordance with GB / T9755-2014 "Synthetic Resin Emulsion Exterior Wall Paint." The coating prepared in this embodiment was a white, viscous liquid with no lumps in the container. After stirring, the slurry was uniformly dispersed. It was stable and did not deteriorate at low temperatures.

[0061] The coating drying time is 10 minutes, the coating has no obvious shrinkage holes and sagging, and the coating is uniform.

[0062] Alkali resistance and water resistance tests showed that the coating films did not show any cracking, blistering or powdering.

[0063] The thermal insulation performance of the product of this embodiment was tested in accordance with GB / T25261-2018 "Reflective Thermal Insulation Coatings for Buildings", and its thermal conductivity was measured to be 0.034 W / m / K and the thermal insulation temperature difference was 18.2°C.

[0064] Example 3: The similarities between this example and Example 2 are not repeated here. The difference is that this example has some adjustments in the raw material composition and ratio, including the following raw materials in parts by weight: 70 parts of aqueous unsaturated polyester resin emulsion, 15 parts of glass microspheres, 15 parts of biochar-cellulose-based aerogel, 10 parts of rutile titanium dioxide, 2 parts of wollastonite powder, 2 parts of talc, 2 parts of manganese oxide, 1 part of expanded vermiculite, 1 part of kaolin, 2 parts of glass flakes, 2 parts of fibrous brucite, 2 parts of non-ionic dispersant, 2 parts of strong thixotropic thickener, 1 part of leveling agent, and 35 parts of deionized water.

[0065] The preparation method of the energy-saving coating of this embodiment is:

[0066] Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and fillers (including wollastonite powder, talc, manganese oxide, expanded vermiculite, kaolin, glass flakes, and fiber brucite) in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve;

[0067] Step 2: Stir the deionized water and the mixed powder at a speed of 100 r / min for 30 min to obtain a mixed material;

[0068] Step 3: Stir the additives (including non-ionic dispersant, strong thixotropic thickener, leveling agent) and water-based unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 250 r / min for 2 hours to obtain the coating.

[0069] Performance testing: The product of this embodiment was tested in accordance with GB / T9755-2014 "Synthetic Resin Emulsion Exterior Wall Paint." The coating prepared in this embodiment was a white, viscous liquid with no lumps in the container. After stirring, the slurry was uniformly dispersed. It was stable and did not deteriorate at low temperatures.

[0070] The coating drying time is 12 minutes, the coating has no obvious shrinkage holes and sagging, and the coating is uniform.

[0071] Alkali resistance and water resistance tests showed that the coating films did not show any cracking, blistering or powdering.

[0072] The thermal insulation performance of the product of this embodiment was tested in accordance with GB / T25261-2018 "Reflective Thermal Insulation Coatings for Buildings", and its thermal conductivity was measured to be 0.039 W / m / K and the thermal insulation temperature difference was 17.7°C.

[0073] Example 4: The similarities between this example and Example 1 are not repeated here. The difference is that this example has some adjustments in the raw material composition and ratio, including the following raw materials in parts by weight: 55 parts of aqueous unsaturated polyester resin emulsion, 5 parts of glass microspheres, 5 parts of biochar-cellulose-based aerogel, 12 parts of rutile titanium dioxide, 3 parts of wollastonite powder, 3 parts of talc, 3 parts of manganese oxide, 3 parts of expanded vermiculite, 3 parts of kaolin, 2 parts of nonionic dispersant, 1 part of strong thixotropic thickener, 2 parts of leveling agent, and 55 parts of deionized water.

[0074] The preparation method of the energy-saving coating of this embodiment is:

[0075] Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and fillers (including wollastonite powder, talc, manganese oxide, expanded vermiculite, and kaolin) in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve;

[0076] Step 2: Stir the deionized water and the mixed powder at a speed of 150 r / min for 30 min to obtain a mixed material;

[0077] Step 3: Stir the additives (including non-ionic dispersant, strong thixotropic thickener, leveling agent) and water-based unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 250 r / min for 2 hours to obtain the coating.

[0078] Performance testing: The product of this embodiment was tested in accordance with GB / T9755-2014 "Synthetic Resin Emulsion Exterior Wall Paint." The coating prepared in this embodiment was a white, viscous liquid with no lumps in the container. After stirring, the slurry was uniformly dispersed. It was stable and did not deteriorate at low temperatures.

[0079] The coating drying time is 15 minutes, the coating appearance has no obvious shrinkage holes and sagging, and the coating is uniform.

[0080] Alkali resistance and water resistance tests showed that the coating films did not show any cracking, blistering or powdering.

[0081] The thermal insulation performance of the product of this embodiment was tested in accordance with GB / T25261-2018 "Reflective Thermal Insulation Coatings for Buildings", and its thermal conductivity was measured to be 0.046 W / m / K and the thermal insulation temperature difference was 15.6°C.

[0082] Example 5: The similarities between this example and Example 1 are not repeated here. The difference is that this example has some adjustments in the raw material composition and ratio, including the following raw materials in parts by weight: 60 parts of aqueous unsaturated polyester resin emulsion, 5 parts of glass microspheres, 10 parts of biochar-cellulose-based aerogel, 12 parts of rutile titanium dioxide, 1 part of wollastonite powder, 1 part of talc, 2 parts of manganese oxide, 2 parts of expanded vermiculite, 2 parts of kaolin, 2 parts of glass flakes, 2 parts of fibrous brucite, 5 parts of non-ionic dispersant, 2 parts of strong thixotropic thickener, 3 parts of leveling agent, and 40 parts of deionized water.

[0083] The preparation method of the energy-saving coating of this embodiment is:

[0084] Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and fillers (including wollastonite powder, talc, manganese oxide, expanded vermiculite, and kaolin) in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve;

[0085] Step 2: Stir the deionized water and the mixed powder at a speed of 200 r / min for 20 min to obtain a mixed material;

[0086] Step 3: Stir the additives (including non-ionic dispersant, strong thixotropic thickener, leveling agent) and aqueous unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 300 r / min for 1 hour to obtain the coating.

[0087] Performance testing: The product of this embodiment was tested in accordance with GB / T9755-2014 "Synthetic Resin Emulsion Exterior Wall Paint." The coating prepared in this embodiment was a white, viscous liquid with no lumps in the container. After stirring, the slurry was uniformly dispersed. It was stable and did not deteriorate at low temperatures.

[0088] The coating drying time is 18 minutes, the coating appearance has no obvious shrinkage holes and sagging, and the coating is uniform.

[0089] Alkali resistance and water resistance tests showed that the coating films did not show any cracking, blistering or powdering.

[0090] The thermal insulation performance of the product of this embodiment was tested in accordance with GB / T25261-2018 "Reflective Thermal Insulation Coatings for Buildings", and its thermal conductivity was measured to be 0.05 W / m / K and the thermal insulation temperature difference was 14.9°C.

[0091] Example 6: The similarities between this example and Examples 2 and 3 are not repeated here. The difference is that this example has some adjustments in the raw material composition and ratio, including the following raw materials in parts by weight: 65 parts of aqueous unsaturated polyester resin emulsion, 10 parts of glass microspheres, 15 parts of biochar-cellulose-based aerogel, 15 parts of rutile titanium dioxide, 2 parts of wollastonite powder, 2 parts of talc, 2 parts of manganese oxide, 2 parts of expanded vermiculite, 2 parts of kaolin, 2 parts of glass flakes, 2 parts of fibrous brucite, 5 parts of non-ionic dispersant, 5 parts of strong thixotropic thickener, 5 parts of leveling agent, and 50 parts of deionized water.

[0092] The preparation method of the energy-saving coating of this embodiment is:

[0093] Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and fillers (including wollastonite powder, talc, manganese oxide, expanded vermiculite, kaolin, glass flakes, and fiber brucite) in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve;

[0094] Step 2: Stir the deionized water and the mixed powder at a speed of 200 r / min for 20 min to obtain a mixed material;

[0095] Step 3: Stir the additives (including non-ionic dispersant, strong thixotropic thickener, leveling agent) and aqueous unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 200 r / min for 3 hours to obtain the coating.

[0096] Performance testing: The product of this embodiment was tested in accordance with GB / T9755-2014 "Synthetic Resin Emulsion Exterior Wall Paint." The coating prepared in this embodiment was a white, viscous liquid with no lumps in the container. After stirring, the slurry was uniformly dispersed. The performance was stable and did not deteriorate at low temperatures.

[0097] The coating drying time is 12 minutes, the coating has no obvious shrinkage holes and sagging, and the coating is uniform.

[0098] Alkali resistance and water resistance tests showed that the coating films did not show any cracking, blistering or powdering.

[0099] The thermal insulation performance of the product of this embodiment was tested in accordance with GB / T25261-2018 "Reflective Thermal Insulation Coatings for Buildings", and its thermal conductivity was measured to be 0.038 W / m / K and the thermal insulation temperature difference was 17.9°C.

[0100] From the above, it can be seen that the energy-saving coating preparation process of the present invention is simple, has low requirements for equipment, is low in cost, and saves energy and reduces consumption. Through clever material selection, the prepared coating combines the performance of multiple components, has a low thermal conductivity, and has a high thermal insulation temperature difference, and has good thermal insulation performance. The coating with added glass flakes and fiber brucite has even better thermal insulation performance. Moreover, the energy-saving coating prepared by the present invention has the advantages of flame retardancy, heat insulation, high coating film strength, corrosion resistance, and not easy to crack. Moreover, its film curing speed is fast and can be constructed in an environment of ten degrees below zero, which is convenient for construction.

[0101] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-efficiency, energy-saving coating based on aerogel and glass microspheres, characterized by: The method comprises the following raw materials in parts by weight: 50-70 parts of aqueous unsaturated resin emulsion, 5-15 parts of glass microspheres, 5-15 parts of biochar-cellulose-based aerogel, 10-15 parts of rutile titanium dioxide, 10-20 parts of filler, 5-15 parts of additive, and 30-55 parts of deionized water; The aqueous unsaturated resin emulsion is an aqueous unsaturated polyester resin emulsion, which includes 100 parts of succinic acid type unsaturated polyester resin, 100 parts of deionized water, 10 parts of potassium hydroxide, 0.2 parts of organosilicon modified polyacrylate, and 0.2 parts of polyether ester defoamer; The glass microspheres are surface-modified glass microspheres coated with TiO2; The filler comprises 1-5 parts of wollastonite powder, 1-3 parts of talc powder, 2-5 parts of manganese oxide, 1-3 parts of expanded vermiculite, 1-3 parts of kaolin, 1-5 parts of glass flakes, and 1-5 parts of fiber brucite; The preparation method of the biochar-cellulose-based aerogel comprises the following steps: S1. Adding KOH to peanut shell biochar to obtain modified peanut shell biochar; S2, dissolving sugarcane cellulose in a 10 wt % NaOH / 12 wt % urea aqueous solution to obtain a cellulose solution; S3. Mix the cellulose solution and modified peanut shell biochar in a ratio of 1:1 and stir for 4-8 hours; then add 20% N'N-methylenebisacrylamide, continue stirring for 5 hours, and let it stand at room temperature for 24 hours to form a hydrogel; S4. Place the hydrogel in deionized water, adjust the pH to neutral, and then freeze-dry it in a freeze dryer for 48 hours to prepare a biochar-cellulose aerogel.

2. The high-efficiency energy-saving coating based on aerogel and glass microspheres according to claim 1, characterized in that: The method comprises the following raw materials in parts by weight: 60 parts of aqueous unsaturated resin emulsion, 10 parts of glass microbeads, 10 parts of biochar-cellulose-based aerogel, 10 parts of rutile titanium dioxide, 15 parts of filler, 10 parts of additive, and 50 parts of deionized water.

3. The high-efficiency energy-saving coating based on aerogel and glass microspheres according to claim 1, characterized in that: The auxiliary agent includes 2-5 parts of a dispersant, 1-5 parts of a strong thixotropic thickener, and 1-5 parts of a leveling agent.

4. The high-efficiency energy-saving coating based on aerogel and glass microspheres according to claim 1, characterized in that: The glass microspheres are prepared by first surface-modifying the glass microspheres with an alkaline solution and then coating the surface of the glass microspheres with a layer of TiO2 using a chemical deposition method. The steps are as follows: (1) Immerse the glass microspheres in a 0.3 mol / L NaOH solution and stir for 4 h, then rinse with clean water until neutral to obtain surface-modified glass microspheres; (2) Weigh the modified glass microspheres, add distilled water, and dropwise add sodium dodecylbenzenesulfonate aqueous solution and stir; raise the temperature to 100°C, add NaOH dropwise to adjust the pH to 2-3, then dropwise add 10 wt% titanium sulfate solution, and simultaneously add NaOH dropwise to maintain a constant pH until the titanium sulfate is completely added; (3) After filtering, washing, and drying, the mixture is calcined at 600°C to obtain surface-modified glass microspheres coated with TiO2.

5. A method for preparing a high-efficiency energy-saving coating based on aerogel and glass microspheres according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Place glass microspheres, biochar-cellulose-based aerogel, rutile titanium dioxide, and filler in a grinder and mix them evenly to obtain a mixed powder that passes through a 100-mesh sieve; Step 2: Stir the deionized water and the mixed powder at a speed of 100-200 r / min for 20-30 min to obtain a mixed material; Step 3: Stir the additive and the water-based unsaturated resin emulsion evenly, pour them into the mixture, stir, and disperse and grind at a speed of 200-300 r / min for 1-3 hours to obtain the coating.