Preparation method of photo-thermal composite phase change material temperature control coating fabric
By preparing light thermal composite phase changes on the building's exterior wall or curtains, the use of biological carbon materials to convert solar energy into heat energy and store the problem of high indoor heating energy consumption and uncoordinated thermal supply and demand, and achieved it. Effectively use solar energy and reduce the effect of building energy consumption.
Patent Information
- Application Number
- CN202411498269.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-01-28
AI Technical Summary
Relying on air conditioning in indoor heating in winter leads to high energy consumption, and the short sunshine time and sunshine intensity are different, resulting in inconsistent heat supply and demand, making it difficult to effectively utilize solar energy.
Preparation of light thermal composite phase changes on the outer wall decorative wall cloth or curtains. Thermal composite phase change material converts the light energy into thermal energy, and stores thermal energy through the phase change process to adjust the indoor temperature.
Effectively improve the efficiency of solar energy, solve the heat supply and demand spear array of indoor temperature regulation, reduce the energy consumption of building operation, and improve indoor comfort.
Smart Images
Figure CN119372929A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of new material preparation, and in particular relates to a method for preparing a photothermal composite phase change material temperature control coating fabric. Background Art
[0002] In order to maintain a comfortable indoor living environment, a large amount of energy is consumed during the operation of buildings. In 2018, the energy consumption during the operation of buildings accounted for 21.7% of the total national energy consumption, and it has shown an increasing trend year by year, bringing a serious energy consumption burden. However, fossil energy is a non-renewable resource. The large-scale consumption of humans has led to the gradual depletion of fossil energy. The search for clean and renewable new energy is related to the sustainable development of human civilization. Solar energy is generated by the fusion of hydrogen and helium inside the sun. It has the characteristics of cleanliness and pollution-free. It is a renewable energy. In recent years, solar energy has become an important part of human energy use. In 2023, solar energy has become the main source of global electricity growth and a highlight of the development of renewable energy. It is of great social significance to effectively use solar energy in building operations and reduce dependence on fossil energy.
[0003] In southern China, indoor winter heating mainly relies on air conditioning, which causes a surge in electricity consumption in winter. Not only is the building's operation energy consumption high, the temperature difference between the air conditioning equipment switch is large, and it is easy to cause health problems such as air-conditioning disease. Improving the room's ability to absorb solar energy, effectively converting solar energy into heat energy, and improving the overall indoor temperature and comfort are the keys to effectively solving the above problems. Photothermal conversion materials can effectively convert light energy into heat energy. Applying them to curtains and outdoor decorative wall cloths can effectively increase indoor temperature. However, due to the short sunshine time in winter and the large difference in sunshine intensity between morning, noon and evening, it is easy to cause the problem of uncoordinated supply and demand of heat energy. In summary, how to efficiently convert solar energy and controllably store and release heat energy is the key to solving the above problems.
[0004] If a photothermal composite phase change material temperature control coating can be prepared on the exterior wall decorative wall cloth or curtains, the solar energy can be absorbed and converted into thermal energy through photothermal conversion, and the thermal energy can be absorbed and stored by the phase change process. When the indoor temperature drops, the energy can be released to adjust the indoor temperature environment, which can effectively reduce the energy consumption of building operation and is of great significance. Summary of the invention
[0005] The present invention aims to improve the utilization efficiency of solar energy and solve the problems of high building energy consumption caused by air conditioning and heating in winter. This application proposes a method for preparing a photothermal composite phase change material temperature control coating fabric, and the specific technical scheme is as follows:
[0006] The coating fabric structure includes, from the inside out, polyester fabric substrate, microsphere foaming layer, photothermal composite phase change temperature control coating; the polyester fabric is a sealed fabric, and the microsphere foaming coating contains polyacrylic acid microspheres; the photothermal composite phase change temperature control coating contains biochar photothermal composite phase change material. In this coating system, the polyester fabric is sealed to prevent leakage and migration of the coating slurry and avoid the problem of uneven coating; the microsphere foaming coating can provide good roughness and a large specific surface area, improve the adhesion of the coating surface, and the hollow microsphere structure can block energy transmission and have a good heat insulation effect; the photothermal composite phase change temperature control coating can convert light energy into heat energy for energy storage.
[0007] According to an embodiment of the present application, the sealing treatment of the polyester fabric comprises the following steps: adding 15-30 parts of water-based polyacrylate to 50-70 parts of water, stirring at a high speed of 1500r / min, adding 5-10 parts of a cross-linking agent and 3-5 parts of a thickener respectively after mixing evenly, stirring evenly and then applying the mixture on the surface of the polyester fabric, pre-drying with infrared rays, and then drying at high temperature.
[0008] According to an embodiment of the present application, the microsphere foaming coating comprises the following steps: in 70 parts of aqueous acrylic emulsion, 1-3 parts of a dispersant, 10-20 parts of polypropylene microspheres, 5-10 parts of a cross-linking agent and 3-5 parts of a thickener are sequentially added, stirred evenly and then applied on a polyester fabric, and then subjected to infrared pre-baking treatment and high-temperature drying to promote the foaming of the microspheres to form a microsphere foaming coating.
[0009] According to an embodiment of the present application, the photothermal composite phase change temperature control coating is prepared by adding 10-20 parts of polydimethylsiloxane (PDMS) to 80 parts of ethyl acetate, stirring and mixing evenly, adding 20-30 parts of biochar composite phase change material, and then adding 1-3 parts of curing agent and 1-3 parts of thickener, mixing evenly and then scraping to obtain the photothermal composite phase change temperature control coating.
[0010] According to the embodiment of the present application, the coating processing speed of the polyester sealing fabric is 4 m / min, the coating thickness is 2-10 microns, and after infrared pre-baking for 5-10 minutes, it is dried at a high temperature of 105°C.
[0011] According to the embodiment of the present application, the thickness of the microsphere foaming coating is 2-10 microns, and the coating weight is 100-200 g / m 2 The operation process includes: stirring the mixed slurry at a high speed of 2000r / min, the infrared pre-baking time is 5-10min, the microsphere foaming temperature is 180℃, and the high-temperature baking time is 2-5min.
[0012] According to an embodiment of the present application, in the photothermal composite phase change temperature control coating, the particle size of the added biochar composite phase change material is 1-2 microns, the coating curing temperature is 80°C, the time is 30 minutes, and the coating thickness is 20-60 microns.
[0013] According to an embodiment of the present application, in the photothermal composite phase-change temperature-control coating fabric, the aqueous acrylate emulsion used is one of acrylate-polyurethane emulsion and silicone-modified acrylate.
[0014] According to an embodiment of the present application, the thickener for preparing the photothermal composite phase change temperature control coating material is one of sodium alginate, sodium carboxymethyl cellulose and modified starch.
[0015] According to an embodiment of the present application, the dispersant for preparing the photothermal composite phase change temperature control coating material is one of trimethyl stearamide, alkylphenol polyoxyethylene ether, polyoxyethylene castor oil, and sorbitol alkylate, and the phase change material is one of paraffin, palmitic acid, polyethylene glycol, neopentyl glycol, and trimethylolethane.
[0016] Beneficial effects:
[0017] The embodiments of the present application prepare a photothermal composite phase change material temperature control coating on the exterior wall decorative wall cloth or curtains. When there is sufficient outdoor light, it can absorb solar energy and convert it into thermal energy through photothermal conversion, and utilize the phase change process to absorb thermal energy for storage. When the indoor temperature drops, the energy is released to adjust the indoor temperature environment, solve the contradiction between supply and demand of indoor heat, and is of great significance to effectively reduce the energy consumption of building operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The morphology and structure of the photothermal composite phase change temperature control coating in the example of the present invention.
[0019] Figure 2 This is the photothermal conversion effect of the coating surface under sunlight in Example 1 of the present invention.
[0020] Figure 3 This is the photothermal conversion effect of the coating surface under sunlight in Example 2 of the present invention.
[0021] Figure 4 This is the photothermal conversion effect of the coating surface under sunlight in Example 3 of the present invention.
[0022] Figure 5 is the latent heat value of the photothermal composite phase change coating fabric in Example 3 of the present invention. DETAILED DESCRIPTION
[0023] Example 1
[0024] This embodiment provides a method for preparing a photothermal composite phase change material temperature control coating, and the preparation process is as follows:
[0025] First, the polyester fabric was sealed, 20 parts of silicone modified acrylate were added to 50 parts of water, and stirred at a high speed of 1500r / min. After mixing evenly, 8 parts of cross-linking agent and 3 parts of sodium alginate were added respectively, stirred evenly and then coated on the surface of the polyester fabric, infrared pre-baked for 8 minutes, and then dried at 105°C. Then, the microsphere foaming coating was prepared, 2 parts of alkylphenol polyoxyethylene ether, 10 parts of polypropylene microspheres, 7 parts of cross-linking agent and 3 parts of sodium alginate were added to 70 parts of silicone modified acrylate, and then coated on the polyester fabric with a knife. After infrared pre-baking for 8 minutes, the baking time was 5 minutes at 180°C to promote the foaming of the microspheres and form a microsphere foaming coating. Finally, the photothermal composite phase change temperature control coating was prepared by adding 10 parts of polydimethylsiloxane (PDMS) to 80 parts of ethyl acetate, stirring and mixing, adding 20 parts of biochar composite phase change material, and then adding 1 part of curing agent and 1 part of sodium alginate. After mixing, the coating was scraped at a speed of 4m / min to obtain the photothermal composite phase change temperature control coating. The microscopic morphology of the coating is observed, such as Figure 1 As shown, the photothermal conversion effect of the coating surface under sunlight is measured, such as Figure 2 shown.
[0026] Example 2
[0027] This embodiment provides a method for preparing a photothermal composite phase change material temperature control coating, and the preparation process is as follows:
[0028] First, the polyester fabric was sealed, 30 parts of acrylate-polyurethane emulsion was added to 70 parts of water, and stirred at a high speed of 1500r / min. After mixing evenly, 10 parts of cross-linking agent and 4 parts of modified starch were added respectively, stirred evenly, and then coated on the surface of the polyester fabric, infrared pre-baked for 3 minutes, and then dried at 105°C. Then, the microsphere foaming coating was prepared. 3 parts of trimethyl stearamide, 20 parts of polypropylene microspheres, 8 parts of cross-linking agent and 2 parts of modified starch were added to 80 parts of acrylate-polyurethane emulsion in sequence, stirred evenly, and then coated on the polyester fabric, infrared pre-baked for 5 minutes, and then baked at 180°C for 3 minutes to promote the foaming of the microspheres to form a microsphere foaming coating. Finally, the photothermal composite phase change temperature control coating was prepared by adding 15 parts of polydimethylsiloxane (PDMS) to 100 parts of ethyl acetate, stirring and mixing, adding 25 parts of biochar composite phase change material, and then adding 2 parts of curing agent and 1 part of sodium carboxymethyl cellulose. After mixing, the coating was scraped at a speed of 4m / min to obtain the photothermal composite phase change temperature control coating. The photothermal conversion effect of the coating surface under sunlight was measured, such as Figure 3 shown.
[0029] Example 3
[0030] This embodiment provides a method for preparing a photothermal composite phase change material temperature control coating, and the preparation process is as follows:
[0031] First, the polyester fabric was sealed, 25 parts of silicone-modified acrylate were added to 70 parts of water, and stirred at a high speed of 1500r / min. After mixing evenly, 10 parts of cross-linking agent and 5 parts of sodium carboxymethyl cellulose were added respectively, stirred evenly and then coated on the surface of the polyester fabric, infrared pre-baked for 10 minutes, and then dried at 105°C. Then, the microsphere foaming coating was prepared, 5 parts of polyoxyethylene castor oil, 20 parts of polypropylene microspheres, 5 parts of cross-linking agent and 2 parts of sodium carboxymethyl cellulose were added to 50 parts of acrylic-polyurethane emulsion in sequence, stirred evenly and then coated on the polyester fabric, infrared pre-baked for 3 minutes, and then baked at 180°C for 4 minutes to promote the foaming of the microspheres to form a microsphere foaming coating. Finally, the photothermal composite phase change temperature control coating was prepared by adding 20 parts of polydimethylsiloxane (PDMS) to 90 parts of ethyl acetate, stirring and mixing, adding 20 parts of biochar composite phase change material, and then adding 2 parts of curing agent and 3 parts of modified starch. After mixing, the coating was scraped at a speed of 4m / min to obtain the photothermal composite phase change temperature control coating. The photothermal conversion effect of the coating surface under sunlight was measured, such as Figure 4 shown.
Claims
1. A method for preparing a photothermal composite phase change material temperature control coating fabric, characterized in that: The coating fabric structure includes polyester fabric substrate, microsphere foaming layer, photothermal composite phase change temperature control coating from inside to outside; the polyester fabric is a sealed fabric, and polyacrylic acid microspheres are added to the microsphere foaming coating; the photothermal composite phase change temperature control coating contains biochar photothermal composite phase change material. In this coating system, the polyester fabric is sealed to prevent leakage and migration of the coating slurry and avoid the problem of uneven coating; the microsphere foaming coating can provide good roughness and a large specific surface area, improve the adhesion of the coating surface, and the hollow microsphere structure can block energy transmission and have a good heat insulation effect; the photothermal composite phase change temperature control coating can convert light energy into heat energy for energy storage.
2. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claim 1, characterized in that: The polyester fabric needs to be sealed, and the steps are as follows: add 15-30 parts of water-based polyacrylate to 50-70 parts of water, stir at a high speed of 1500r / min, add 5-10 parts of cross-linking agent and 3-5 parts of thickener respectively after mixing evenly, stir evenly and then apply it on the surface of the polyester fabric, pre-dry with infrared, and dry at high temperature.
3. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claim 1, characterized in that: Microsphere foaming is used to obtain a rough coating interface with a high specific surface area. The steps are as follows: 1-3 parts of a dispersant, 10-20 parts of polypropylene microspheres, 5-10 parts of a cross-linking agent and 3-5 parts of a thickener are added in sequence to 70 parts of an aqueous acrylic emulsion, the mixture is evenly stirred and then applied on a polyester fabric, and the mixture is pre-baked with infrared rays and then dried at high temperature to promote the foaming of the microspheres to form a microsphere foaming coating.
4. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claim 1, characterized in that: The photothermal composite phase change temperature control coating solves the problem of uncoordinated energy supply and demand through photothermal conversion and heat storage. Its preparation steps are: add 10-20 parts of polydimethylsiloxane (PDMS) to 80 parts of ethyl acetate, stir and mix evenly, add 20-30 parts of biochar composite phase change material, and then add 1-3 parts of curing agent and 1-3 parts of thickener, mix evenly and then apply it by scraping to obtain the photothermal composite phase change temperature control coating.
5. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claim 2, characterized in that: The coating processing speed of polyester sealing fabric is 4m / min, the coating thickness is 2-10 microns, after infrared pre-baking for 5-10 minutes, it is dried at a high temperature of 105℃.
6. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claim 3, characterized in that: The thickness of the microsphere foam coating is 2-10 microns, and the coating weight is 100-200g / m 2 The operation process includes: stirring the mixed slurry at a high speed of 2000r / min, the infrared pre-baking time is 5-10min, the microsphere foaming temperature is 180℃, and the high-temperature baking time is 2-5min.
7. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claim 4, characterized in that: The particle size of the biochar composite phase change material added to the photothermal composite phase change temperature control coating is 1-2 microns, the coating curing temperature is 80°C, the time is 30 minutes, and the coating thickness is 20-60 microns.
8. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claims 1-3, characterized in that: The aqueous acrylate emulsion used to prepare the photothermal composite phase change temperature control coating fabric is one of acrylate-polyurethane emulsion and silicone modified acrylate.
9. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claims 1-3, characterized in that: The thickener for preparing the photothermal composite phase change temperature control coating material is one of sodium alginate, sodium carboxymethyl cellulose and modified starch.
10. The method for preparing a photothermal composite phase change material temperature control coating fabric according to claims 1-3, characterized in that: The dispersant for preparing the photothermal composite phase change temperature control coating material is one of trimethyl stearamide, alkylphenol polyoxyethylene ether, polyoxyethylene castor oil, and sorbitol alkylate, and the phase change material is one of paraffin, palmitic acid, polyethylene glycol, neopentyl glycol, and trimethylolethane.