Indoor heat-insulation coating with phase change function

Abstract

This application relates to an indoor thermal insulation coating with phase change function, belonging to the field of water-based coatings. By weight percentage, it comprises the following components: 10-20% mixed emulsion, 5-10% hollow glass microspheres, 3-8% mica powder, 10-20% heavy calcium carbonate, 10-20% titanium dioxide, 0.5-1% dispersant, 0.8-1.5% leveling agent, 0.5-0.7% polysiloxane defoamer, 0.5-1.5% thickener, 0.5-1.5% wetting agent, 5-8% film-forming aid, 0.5-1.5% glycerol, 0.1-0.5% microcrystalline wax, 0.1-0.3% preservative and bactericide, and 5-10% nano-silicon material; the balance being water. This application improves the thermal insulation performance, adhesion, and stability of the indoor thermal insulation coating. The phase change material and thermal insulation material, together with various additives, pigments, and fillers, work together to achieve temperature regulation and save energy.

Description

Technical Field

[0001] This application relates to the field of water-based coatings, and in particular to an indoor thermal insulation coating with phase change function. Background Technology

[0002] Building insulation materials, when combined with the building's structural envelope, endow buildings with thermal insulation properties, making them commonly used in building energy conservation. In today's increasingly energy-constrained world, traditional insulation materials are no longer adequate for the demands of the new situation. Developing and applying high-performance insulation materials is currently an effective and economical energy-saving measure. Coatings are essential decorative materials for walls, and building insulation coatings are widely used due to their economic efficiency, ease of use, and excellent thermal insulation effects.

[0003] The convective exchange of indoor and environmental energy is the main factor leading to indoor energy loss. Adding inorganic and organic phase change materials to traditional thermal insulation coatings can transform interior wall coatings into new functional wall materials that integrate multiple properties such as thermal insulation, heat storage, and humidity regulation. The phase change materials used possess temperature sensitivity and thermal energy storage capabilities. By adjusting the phase change temperature of the phase change materials, the functions of heat storage and release are achieved, thereby reducing the convection between indoor and environmental energy and achieving better energy conservation. Related technologies that add thermal insulation materials to coatings to achieve thermal insulation performance through physical insulation have relatively poor temperature regulation effects and therefore need improvement. Summary of the Invention

[0004] In order to improve the thermal insulation performance of coatings, this application provides an indoor thermal insulation coating with phase change function.

[0005] The technical solution for an indoor thermal insulation coating with phase change function provided in this application is as follows:

[0006] An indoor thermal insulation coating with phase change function, comprising the following components by weight percentage:

[0007] Mixed emulsion 10-20%

[0008] 5-10% hollow glass microspheres

[0009] 3-8% mica powder

[0010] 10-20% Trihydrate

[0011] Titanium dioxide 10-20%

[0012] Dispersant 0.5-1%

[0013] Leveling agent 0.8-1.5%

[0014] Polysiloxane defoamer 0.5-0.7%

[0015] Thickener 0.5-1.5%

[0016] Wetting agent 0.5-1.5%

[0017] Film-forming aids 5-8%

[0018] Glycerol 0.5-1.5%

[0019] Microcrystalline wax 0.1-0.5%

[0020] Preservative and bactericide 0.1-0.3%

[0021] 5-10% nano-silicon materials;

[0022] The remainder is water.

[0023] Hollow glass microspheres and nano-silicon materials are materials with good thermal insulation properties. The materials have a rich porous structure and high porosity, which prevents internal molecules from colliding, achieving a similar effect to vacuum insulation. Glycerol and microcrystalline wax are phase change materials. Through the phase change process between solid and liquid, they can absorb and release a large amount of latent heat. The indoor thermal insulation coating made by the combined action of these two types of materials with pigments, fillers and additives in the formula has outstanding thermal insulation performance, which can reduce the transfer of indoor and outdoor temperature differences and maintain stable indoor temperature.

[0024] Preferably, the mixed emulsion comprises an acrylic emulsion and a polyurethane emulsion.

[0025] The mixed emulsion obtained by combining acrylic emulsion and polyurethane emulsion has good adhesion and stability.

[0026] Preferably, the raw materials for preparing the polysiloxane defoamer include polysiloxane, silicone paste, and ternary composite emulsifier.

[0027] Polysiloxane defoamers synthesized from polysiloxane, silicone paste, and ternary composite emulsifiers exhibit excellent high-temperature resistance, alkali resistance, and defoaming and foam-suppressing properties. They also demonstrate good stability, enhancing the thermal insulation performance of coatings and regulating indoor ambient temperature.

[0028] Preferably, the leveling agent includes a BYK silicone-based leveling agent.

[0029] Preferably, the thickener includes one of a polyurethane associative thickener and a hydrophobically modified alkali-swellable thickener.

[0030] Preferably, the film-forming aid comprises dodecyl alcohol ester.

[0031] Preferably, the preservative and bactericide includes isothiazolinone compounds.

[0032] By using the above-mentioned additives, in combination with phase change materials, thermal insulation materials, and pigments and fillers, the coating can achieve good dispersibility and uniformity, improve its adhesion, anti-corrosion and anti-mildew properties, weather resistance and color retention, thereby achieving good thermal insulation performance.

[0033] Preferably, the nano-silicon material comprises nanoporous silica with a particle size range of 25-35 μm.

[0034] Nanoporous silica has high porosity and can work synergistically with hollow glass microspheres to achieve a similar effect to vacuum insulation. It can also be used in conjunction with microcrystalline wax and glycerol, two phase change materials, to further enhance the thermal insulation performance of coatings.

[0035] Preferably, the indoor thermal insulation coating further includes thermal insulation color paste.

[0036] Thermal insulation color pastes can provide coatings with a rich variety of colors, helping coatings to further improve their thermal insulation performance.

[0037] Preferably, the indoor thermal insulation coating is prepared using the following steps:

[0038] Add water to a mixing container, and add dispersant, leveling agent, polysiloxane defoamer, wetting agent and film-forming aid under stirring conditions. After increasing the speed and stirring, the first mixture is obtained.

[0039] Reduce the stirring speed, add mica powder, heavy calcium carbonate, titanium dioxide, glass microspheres, microcrystalline wax and nano-silicon materials to the first mixture, increase the stirring speed, and after the fineness is qualified, the second mixture is obtained.

[0040] Reduce the stirring speed and add the acrylic emulsion and polyurethane emulsion to the second mixture. After stirring and reacting, the third mixture is obtained.

[0041] Thickener, glycerol and preservative / bacterial agent are added to the third mixture in sequence, stirring speed is increased, and after uniform dispersion, thermal insulation coating base material is obtained.

[0042] Thermal insulation color paste is added to the base material of thermal insulation coating, and after preparation, an indoor thermal insulation coating with phase change function is obtained.

[0043] The coating prepared according to the above steps has good adhesion, thermal insulation properties, weather resistance and stability.

[0044] In summary, this application includes at least one of the following beneficial technical effects:

[0045] 1. Hollow glass microspheres and nano-silicon materials are excellent thermal insulation materials. Their rich porous structure and high porosity prevent internal molecular collisions, achieving a vacuum-like insulation effect. Glycerol and microcrystalline wax are phase change materials; through the phase change process between solid and liquid states, they can absorb and release a large amount of latent heat. The combined effect of these two types of materials with pigments, fillers, and additives in the formula results in an indoor thermal insulation coating with outstanding thermal insulation performance. This reduces the transfer of temperature differences between indoors and outdoors, maintaining a stable indoor temperature.

[0046] 2. The polysiloxane defoamer synthesized by polysiloxane, silicone paste and ternary composite emulsifier has good high temperature resistance, alkali resistance and defoaming and foam suppression properties. The defoamer has good stability and can improve the heat insulation performance of coatings and regulate indoor temperature. Detailed Implementation

[0047] This application discloses an indoor thermal insulation coating with phase change function. The following is a detailed description of this application in conjunction with the embodiments:

[0048] In this application, the hollow glass microspheres are NH20 from Hainuo Technology, the mica powder is 800-mesh sericite powder from Chuzhou Gree Mining, the heavy calcium carbonate is 800-mesh heavy calcium carbonate from Jiangxi Guangyuan Chemical, the titanium dioxide is Shandong Dongjia R-237 rutile titanium dioxide, the dispersant is Dow's multifunctional dispersant OROTAN731A, the leveling agent is BYK-345 silicone leveling agent, the thickener is a polyurethane associative thickener, the nanoporous silica has a particle size of 30μm, and the wetting agent is Dow's nonionic low-foaming surfactant. All other raw materials are commercially available.

[0049] Example 1

[0050] Preparation of polysiloxane defoamer

[0051] Mix 10g of polysiloxane, 15g of silicone paste and 5g of ternary composite emulsifier to obtain a mixture. Keep the mixture at 95℃ for 7 hours to obtain polysiloxane defoamer.

[0052] Preparation of indoor thermal insulation coatings with phase change function

[0053] Add 117 kg of water to a mixing container. While stirring at 300 rpm, add 10 kg of dispersant, 5 kg of leveling agent, 10 kg of polysiloxane defoamer, 20 kg of wetting agent, and 20 kg of film-forming aid. Increase the stirring speed to 800 rpm and disperse for 5 minutes to obtain the first mixture. Reduce the stirring speed to 500 rpm and add 80 kg of mica powder, 200 kg of heavy calcium carbonate, 150 kg of titanium dioxide, 100 kg of glass microspheres, 5 kg of microcrystalline wax, and 50 kg of nano-silicon material to the first mixture. Gradually increase the stirring speed to 1500 rpm and disperse for 3 minutes. After 0 min and the fineness test is qualified, the second mixture is obtained; the stirring speed is reduced to 500 rpm, and 100 kg of acrylic emulsion and 100 kg of polyurethane emulsion are added to the second mixture. After mixing at 500 rpm for 10 min, the third mixture is obtained; 15 kg of thickener, 15 kg of glycerol and 3 kg of preservative and bactericide are added to the third mixture in sequence, the stirring speed is increased to 800 rpm, and after dispersing for 15 min, the thermal insulation coating base material is obtained; thermal insulation color paste is added to the thermal insulation coating base material, and after preparation, an indoor thermal insulation coating with phase change function is obtained.

[0054] Example 2

[0055] Preparation of polysiloxane defoamer

[0056] Mix 10g of polysiloxane, 15g of silicone paste and 5g of ternary composite emulsifier to obtain a mixture. Keep the mixture at 95℃ for 7 hours to obtain polysiloxane defoamer.

[0057] Preparation of indoor thermal insulation coatings with phase change function

[0058] Add 234 kg of water to a mixing container. While stirring at 300 rpm, add 20 kg of dispersant, 10 kg of leveling agent, 20 kg of polysiloxane defoamer, 40 kg of wetting agent, and 40 kg of film-forming aid. Increase the stirring speed to 800 rpm and disperse for 5 minutes to obtain the first mixture. Reduce the stirring speed to 500 rpm and add 160 kg of mica powder, 400 kg of heavy calcium carbonate, 300 kg of titanium dioxide, 200 kg of glass microspheres, 10 kg of microcrystalline wax, and 100 kg of nano-silicon material to the first mixture. Gradually increase the stirring speed to 1500 rpm. After dispersing for 30 minutes and verifying that the fineness meets the requirements, the second mixture is obtained. The stirring speed is reduced to 500 rpm, and 200 kg of acrylic emulsion and 200 kg of polyurethane emulsion are added to the second mixture. After mixing at 500 rpm for 10 minutes, the third mixture is obtained. Thickener 30 kg, glycerol 30 kg and preservative and bactericide 6 kg are added to the third mixture in sequence. The stirring speed is increased to 800 rpm, and after dispersing for 15 minutes, the thermal insulation coating base material is obtained. Thermal insulation color paste is added to the thermal insulation coating base material, and after preparation, an indoor thermal insulation coating with phase change function is obtained.

[0059] Example 3

[0060] Preparation of polysiloxane defoamer

[0061] Mix 10g of polysiloxane, 15g of silicone paste and 5g of ternary composite emulsifier to obtain a mixture. Keep the mixture at 95℃ for 7 hours to obtain polysiloxane defoamer.

[0062] Preparation of indoor thermal insulation coatings with phase change function

[0063] Add 220 kg of water to a mixing container. While stirring at 300 rpm, add 7.5 kg of dispersant, 11.5 kg of leveling agent, 6 kg of polysiloxane defoamer, 10 kg of wetting agent, and 65 kg of film-forming aid. Increase the stirring speed to 800 rpm and disperse for 5 minutes to obtain the first mixture. Reduce the stirring speed to 500 rpm and add 55 kg of mica powder, 150 kg of heavy calcium carbonate, 150 kg of titanium dioxide, 75 kg of glass microspheres, 3 kg of microcrystalline wax, and 75 kg of nano-silicon material to the first mixture. Gradually increase the stirring speed to 1500 rpm. After dispersing for 30 minutes and verifying that the fineness meets the requirements, the second mixture is obtained. The stirring speed is reduced to 500 rpm, and 75 kg of acrylic emulsion and 75 kg of polyurethane emulsion are added to the second mixture. After mixing at 500 rpm for 10 minutes, the third mixture is obtained. 10 kg of thickener, 10 kg of glycerol, and 2 kg of preservative and bactericide are added to the third mixture in sequence. The stirring speed is increased to 800 rpm, and after dispersing for 15 minutes, the thermal insulation coating base material is obtained. Thermal insulation color paste is added to the thermal insulation coating base material, and after preparation, an indoor thermal insulation coating with phase change function is obtained.

[0064] Example 4

[0065] Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that silicone paste is not added in the step of preparing polysiloxane defoamer in Example 4.

[0066] Example 5

[0067] Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that in Example 5, the ternary composite emulsifier in the step of preparing polysiloxane defoamer is replaced with a nonionic emulsifier.

[0068] Example 6

[0069] Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that in Example 6, the BYK silicone leveling agent is replaced with an acrylic leveling agent.

[0070] Example 7

[0071] Example 7 is based on Example 3. The only difference between Example 7 and Example 3 is that in Example 7, the alcohol ester dodecyl is replaced with diethylene glycol monobutyl ether.

[0072] Example 8

[0073] Example 8 is based on Example 3. The only difference between Example 8 and Example 3 is that in Example 8, the isothiazolinone compound is replaced with a hydroxyphenyl ester preservative.

[0074] Example 9

[0075] Example 9 is based on Example 3. The only difference between Example 9 and Example 3 is that in Example 9, nanoporous silica is replaced with nano-silica.

[0076] Comparative Example 1

[0077] Comparative Example 1 is based on Example 3. The only difference between Comparative Example 1 and Example 3 is that the polysiloxane defoamer in Comparative Example 1 is replaced with a polyether defoamer.

[0078] Comparative Example 2

[0079] Comparative Example 2 is based on Example 3. The only difference between Comparative Example 2 and Example 3 is that glycerol is not added in Comparative Example 2.

[0080] Comparative Example 3

[0081] Comparative Example 3 is based on Example 3. The only difference between Comparative Example 3 and Example 3 is that microcrystalline wax is not added in Comparative Example 3.

[0082] Performance testing

[0083] (1) Referring to the master thesis (Zhang Ling, 2014) "Preparation and Performance Study of Thermal Insulation Coatings for Building Exterior Walls", a self-made simulation thermal insulation tester was used to conduct the experiment. Samples with a coating thickness of 200 μm were prepared. According to the method for determining the thermal conductivity of the coating in Chapter 2.3.4, the thermal conductivity and thermal insulation temperature difference of the prepared samples were tested. Each sample was tested three times, and the average value was taken after measurement. The results are recorded in Table 1.

[0084] (2) The standard GB / T30803-2014 "Determination of tensile bond strength between thermal insulation materials, adhesives and base coatings for building insulation products" was selected. A sample was coated on the surface of a substrate with a diameter of 500μm*1000μm*10μm. The bond strength of the sample was tested. Three samples were prepared for each sample. The average value was taken after measurement and the results were recorded in Table 1. The standard GB / T1865 "Artificial weathering and artificial radiation exposure of paints and varnishes with filtered xenon arc radiation" was selected. The anti-aging performance was tested using an ultraviolet accelerated aging tester. The UVA-340 ultraviolet lamp was used for 90 days of curing. Three samples were prepared for each sample. The bond strength of the sample after curing was tested. The average value was taken after measurement and the results were recorded in Table 1.

[0085] Table 1. Test results of thermal insulation performance, adhesion performance, and stability of indoor thermal insulation coatings.

[0086]

[0087]

[0088] As shown in Table 1, the thermal conductivity of Examples 1-3 is less than 0.141 W / m·K, the thermal insulation temperature difference is greater than 8.3℃, the adhesion strength under environmental conditions is greater than 2.7 MPa, and the adhesion strength after ultraviolet aging is greater than 2.5 MPa. This shows that the indoor thermal insulation coating prepared in this application has good thermal insulation performance, adhesion performance and stability.

[0089] As shown in Table 1, the differences between Examples 4 and 5 and Example 3 are only as follows: In Example 4, no silicone paste is added during the preparation of the polysiloxane defoamer; in Example 5, the ternary composite emulsifier in the preparation of the polysiloxane defoamer is replaced with a nonionic emulsifier. The thermal conductivity of Examples 4 and 5 is greater than 0.148 W / m·K, the thermal insulation temperature difference is less than 8.1℃, the environmental adhesion strength is less than 2.3 MPa, and the adhesion strength after UV aging is less than 2.1 MPa. In Example 3, the thermal conductivity is 0.123 W / m·K, the thermal insulation temperature difference is 8.8℃, and the environmental adhesion strength is less than 2.3 MPa. The adhesion strength under ambient conditions was 2.8 MPa, and the adhesion strength after UV aging was 2.7 MPa. Compared with Example 3, the thermal insulation performance, adhesion performance, and stability of Examples 4 and 5 all decreased. This is because the absence of silicone paste or the replacement of the ternary composite emulsifier with a nonionic emulsifier during the preparation of the polysiloxane defoamer will affect the stability, high temperature resistance, and alkali resistance of the polysiloxane defoamer, thereby affecting the defoaming and foam suppression performance, resulting in a decrease in the stability of the coating, and thus a decrease in the thermal insulation performance, adhesion performance, and stability.

[0090] As shown in Table 1, the differences between Examples 6, 7, and 8 and Example 3 are only as follows: in Example 6, the BYK silicone leveling agent was replaced with an acrylic leveling agent; in Example 7, the dodecyl alcohol ester was replaced with diethylene glycol monobutyl ether; and in Example 8, the isothiazolinone compound was replaced with a hydroxyphenyl ester preservative. The thermal conductivity of Examples 6, 7, and 8 is greater than 0.152 W / m·K, the thermal insulation temperature difference is less than 8.0℃, the adhesion strength under environmental conditions is less than 2.5 MPa, and the adhesion strength after UV aging is less than 2.2 MPa. Compared with Example 3, the thermal insulation performance, adhesion performance, and stability of Examples 6, 7, and 8 are all reduced. This is because the components of the leveling agent, film-forming aid, and preservative and bactericide were replaced, which destroyed the synergistic effect between the aids, reduced the dispersibility and compatibility of the coating, and thus reduced the thermal insulation performance, adhesion performance, and stability.

[0091] As shown in Table 1, the only difference between Example 9 and Example 3 is that nanoporous silica was replaced with nano-silica in Example 9. The thermal conductivity of Example 9 is 0.213 W / m·K, the thermal insulation temperature difference is 5.3℃, the adhesion strength under environmental conditions is 2.4 MPa, and the adhesion strength after UV aging is 2.0 MPa. Compared with Example 3, the thermal insulation performance, adhesion performance, and stability of Example 9 are all reduced. This is because nanoporous silica is replaced with nano-silica, which lacks a rich pore structure, resulting in a decrease in thermal insulation performance and a weakening of the synergistic effect between the thermal insulation material and the phase change material, thus reducing the thermal insulation performance, adhesion performance, and stability.

[0092] As shown in Table 1, the only difference between Comparative Example 1 and Example 3 is that the polysiloxane defoamer in Comparative Example 1 was replaced with a polyether defoamer. The thermal conductivity of Comparative Example 1 was 0.235 W / m·K, the thermal insulation temperature difference was 4.5℃, the adhesion strength under environmental conditions was 2.1 MPa, and the adhesion strength after UV aging was 1.7 MPa. Compared with Example 3, the thermal insulation performance, adhesion performance, and stability of Comparative Example 1 were significantly reduced. This is because the stability, heat resistance, and alkali resistance of the polyether defoamer were all reduced compared to the polysiloxane defoamer, resulting in a decrease in defoaming performance and affecting the stability of the coating. Consequently, the thermal insulation performance and adhesion performance were significantly reduced.

[0093] As shown in Table 1, the only difference between Comparative Examples 2 and 3 and Example 3 is that Comparative Example 2 does not contain glycerol, and Comparative Example 3 does not contain microcrystalline wax. The thermal conductivity of Comparative Examples 2 and 3 is greater than 0.258 W / m·K, the thermal insulation temperature difference is less than 3.3℃, ​​the adhesion strength under environmental conditions is less than 2.2 MPa, and the adhesion strength after UV aging is less than 1.5 MPa. Compared with Example 3, Comparative Examples 2 and 3 show a significant decrease in thermal insulation performance, adhesion performance, and stability. This is because without the addition of glycerol or microcrystalline wax, the phase change energy storage effect achieved by the single phase change material is weakened, the total amount of latent heat absorption and release is reduced, and the synergistic effect with other components in the coating is weakened, thus resulting in a significant decrease in thermal insulation performance, adhesion performance, and stability.

[0094] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. An indoor thermal insulation coating with phase change function, characterized in that: It consists of the following components by weight percentage: Mixed emulsion 10-20% Hollow glass microspheres 5-10% 3-8% mica powder 10-20% Trihydrate Titanium dioxide 10-20% Dispersant 0.5-1% Leveling agent 0.8-1.5% Polysiloxane defoamer 0.5-0.7% Thickener 0.5-1.5% Wetting agent 0.5-1.5% Film-forming aids 5-8% Glycerol 0.5-1.5% Microcrystalline wax 0.1-0.5% Preservative and bactericide 0.1-0.3% Nano-silicon materials: 5-10%; The remainder is water; The mixed emulsion includes an acrylic emulsion and a polyurethane emulsion; The raw materials for preparing the polysiloxane defoamer include polysiloxane, silicone paste, and ternary composite emulsifier; The nano-silicon material includes nanoporous silica, the particle size of which ranges from 25 to 35 μm.

2. The indoor thermal insulation coating with phase change function according to claim 1, characterized in that: The leveling agent includes BYK silicone leveling agents.

3. The indoor thermal insulation coating with phase change function according to claim 2, characterized in that: The thickener includes one of polyurethane associative thickener and hydrophobically modified alkali-swellable thickener.

4. The indoor thermal insulation coating with phase change function according to claim 3, characterized in that: The film-forming aid includes alcohol ester twelve.

5. An indoor thermal insulation coating with phase change function according to claim 4, characterized in that: The preservative and bactericidal agent includes isothiazolinone compounds.

Images