A highly reflective non-electrical refrigeration coating and its preparation method

Abstract

This invention provides a high-reflectivity, non-electro-cooling coating and its preparation method. The raw materials for this high-reflectivity, non-electro-cooling coating include: 150-250 parts of a high-reflectivity base material, 30-50 parts of a high-reflectivity filler, 20-30 parts of titanium dioxide, 2-5 parts of silver powder, 15-30 parts of aluminum powder, 50-100 parts of ethyl acetate, and 50-100 parts of a reflectivity enhancer. The high-reflectivity base material includes vinylidene fluoride, polyacrylate, and zinc oxide, and the weight ratio of vinylidene fluoride, polyacrylate, and zinc oxide is (3-5):(2-6):(1-3). The high-reflectivity, non-electro-cooling coating provided by this invention has high reflectivity, excellent thermal radiation capability, and excellent cooling effect.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a high-reflectivity, non-electric cooling coating and its preparation method. Background Technology

[0002] Electricity-free cooling coating is a new type of coating that achieves a cooling effect without the need for electricity or refrigerant. This coating utilizes efficient solar reflection and mid-infrared thermal radiation mechanisms, taking outer space as the cooling source, to effectively radiate heat from the surface of objects, thus achieving a cooling effect below ambient temperature.

[0003] Currently available traditional non-electric cooling coatings have a reflectivity of only about 90%, which means they cannot effectively reflect sunlight, resulting in increased heat absorption by the coating. This leads to a rise in the surface temperature of the coating and a weakening of its cooling effect. Therefore, there is an urgent need for a non-electric cooling coating with high reflectivity. Summary of the Invention

[0004] To address the shortcomings of the prior art, this invention provides a high-reflectivity, non-electric cooling coating and its preparation method.

[0005] According to one aspect of the present invention, a high-reflectivity non-electro-cooling coating is provided. The raw materials for preparing the high-reflectivity non-electro-cooling coating, calculated by weight, include: 150-250 parts of high-reflectivity base material, 30-50 parts of high-reflectivity filler, 20-30 parts of titanium dioxide, 2-5 parts of silver powder, 15-30 parts of aluminum powder, 50-100 parts of ethyl acetate, and 50-100 parts of reflectivity enhancer; the high-reflectivity base material includes vinylidene fluoride, polyacrylate, and zinc oxide, and the weight ratio of vinylidene fluoride, polyacrylate, and zinc oxide is (3-5):(2-6):(1-3).

[0006] The present invention uses a high-reflectivity base material prepared from polyvinylidene fluoride, polyacrylate and zinc oxide. This high-reflectivity base material has the advantages of both polymers and nanoparticles. It not only has excellent optical and thermal properties, but also good flexibility and durability, which can improve the reflectivity and thermal radiation capacity of coatings.

[0007] Preferably, the high-reflectivity filler includes nano-calcium carbonate, alumina, and calcium silicate, and the weight ratio of nano-calcium carbonate, alumina, and calcium silicate is (3-5):(2-6):(1-3).

[0008] This invention utilizes a high-reflectivity filler prepared from nano-calcium carbonate, alumina, and calcium silicate. This high-reflectivity filler replaces ordinary fillers and can effectively improve the reflectivity of coatings.

[0009] Preferably, the raw materials used to prepare the reflectivity enhancer, calculated by weight, include: 15-20 parts kaolin, 15-20 parts dolomite, 7-10 parts calcium carbonate, 7-13 parts zircon sand, 2-5 parts barium titanate, 20-30 parts first enhancing solvent, and 25-35 parts second enhancing solvent.

[0010] Preferably, the first reinforcing solvent is prepared from xylene, rosin oil, and methyl ethyl ketone, and the weight ratio of xylene, rosin oil, and methyl ethyl ketone is (0.5-1.5):(2-4):(0.5-1.5).

[0011] The first reinforcing solvent used in this invention is prepared from xylene, rosin oil, and methyl ethyl ketone. This first reinforcing solvent is a highly soluble solvent that can fully dissolve the polymers and other solid components in the coating to ensure the stability and application performance of the coating, thereby better dispersing the pigments and fillers and making them more evenly distributed in the coating, thus improving the reflectivity of the coating.

[0012] Preferably, the second reinforcing solvent is copolymerized from dimethyl sulfoxide and polyethylene glycol, and the weight ratio of dimethyl sulfoxide to polyethylene glycol is (3-5):(2-4).

[0013] The second reinforcing solvent used in this invention is copolymerized from dimethyl sulfoxide and polyethylene glycol. This second reinforcing solvent is a low-volatility solvent, which can prolong the drying time of the coating, allowing the coating to have more time to react, level, and densify, thereby reducing minor defects on the coating surface, improving the smoothness and gloss of the coating, and indirectly improving the reflectivity.

[0014] Preferably, the raw materials for preparing the high-reflectivity, non-electric cooling coating, calculated by weight, further include: 10-15 parts of dispersant, 5-10 parts of leveling agent, 7-9 parts of thickener, and 2-4 parts of defoamer.

[0015] According to another aspect of the present invention, a method for preparing a high-reflectivity, non-electrically cooled coating is provided, comprising the following steps:

[0016] S1. Mix and react high reflective base material, high reflective filler, titanium dioxide, silver powder, aluminum powder, ethyl acetate, dispersant, leveling agent and defoamer at a temperature of 70-100℃ to obtain mixture A;

[0017] S2. Prepare a reflectivity enhancer in a grinding mill; the reflectivity enhancer contains kaolin, dolomite, calcium carbonate, zircon sand, barium titanate, a first enhancing solvent, and a second enhancing solvent;

[0018] S3. Mix mixture A and reflectivity enhancer in a vacuum mixer to obtain a high-reflectivity, non-electric cooling coating.

[0019] Preferably, the reaction stirring speed in step S1 is 200-300 rpm, and the reaction time is 3-5 h.

[0020] Preferably, in step S2, the grinding machine has a mesh size of 600-700, a rotation speed of 20-50 rpm, and a grinding time of 7-9 hours.

[0021] Preferably, in step S3, the speed of the vacuum mixer is 200-300 rpm, and the mixing time is 2-3 hours.

[0022] Preferably, the vacuum degree of the vacuum mixer in step S3 is (-0.08) to (-0.09) MPa.

[0023] Preferably, the weight ratio of mixture A and reflectivity enhancer in step S3 is (5-7):2. Detailed Implementation

[0024] The technical features of the technical solution provided by the present invention will be further clearly and completely described below with reference to specific 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.

[0025] Example 1

[0026] A high-reflectivity, non-electrically cooled coating is prepared by the following steps:

[0027] S1. Mix 150 parts by weight of high reflectivity base material, 30 parts by weight of high reflectivity filler, 20 parts by weight of titanium dioxide, 2 parts by weight of silver powder, 15 parts by weight of aluminum powder, 50 parts by weight of ethyl acetate, 10 parts by weight of dispersant, 5 parts by weight of leveling agent, 7 parts by weight of thickener, and 2 parts by weight of defoamer at a temperature of 70-100℃ to obtain mixture A.

[0028] S2. Prepare a reflectivity enhancer in a grinding mill; the reflectivity enhancer contains 15 parts by weight of kaolin, 15 parts by weight of dolomite, 7 parts by weight of calcium carbonate, 7 parts by weight of zircon sand, 2 parts by weight of barium titanate, 20 parts by weight of the first enhancing solvent and 25 parts by weight of the second enhancing solvent.

[0029] S3. Mix mixture A and reflectivity enhancer in a vacuum mixer to obtain a high-reflectivity, non-electric cooling coating.

[0030] The high-reflectivity substrate includes vinylidene fluoride, polyacrylate, and zinc oxide, and the weight ratio of vinylidene fluoride, polyacrylate, and zinc oxide is 3:2:1.

[0031] The high-reflectivity filler includes nano-calcium carbonate, alumina, and calcium silicate, and the weight ratio of nano-calcium carbonate, alumina, and calcium silicate is 3:2:1.

[0032] The first reinforcing solvent is prepared from xylene, rosin oil, and methyl ethyl ketone, and the weight ratio of xylene, rosin oil, and methyl ethyl ketone is 0.5:2:0.5.

[0033] The second reinforcing solvent is copolymerized from dimethyl sulfoxide and polyethylene glycol, and the weight ratio of dimethyl sulfoxide to polyethylene glycol is 3:2.

[0034] In step S1, the reaction stirring speed is 200 rpm and the reaction time is 3 h.

[0035] In step S2, the grinding machine has a mesh size of 600, a rotation speed of 20 rpm, and a grinding time of 7 hours.

[0036] In step S3, the vacuum mixer speed is 200 rpm and the mixing time is 2 hours.

[0037] In step S3, the vacuum level is -0.08 MPa.

[0038] In step S3, the weight ratio of mixture A and reflectivity enhancer is 5:2.

[0039] Example 2

[0040] A high-reflectivity, non-electrically cooled coating is prepared by the following steps:

[0041] S1. Mix 200 parts by weight of high reflectivity base material, 40 parts by weight of high reflectivity filler, 25 parts by weight of titanium dioxide, 3 parts by weight of silver powder, 22 parts by weight of aluminum powder, 75 parts by weight of ethyl acetate, 13 parts by weight of dispersant, 7 parts by weight of leveling agent, 8 parts by weight of thickener, and 3 parts by weight of defoamer at a temperature of 70-100℃ to obtain mixture A;

[0042] S2. Prepare a reflectivity enhancer in a grinding mill; the reflectivity enhancer contains 17 parts by weight of kaolin, 17 parts by weight of dolomite, 8 parts by weight of calcium carbonate, 10 parts by weight of zircon sand, 3 parts by weight of barium titanate, 25 parts by weight of the first enhancing solvent and 30 parts by weight of the second enhancing solvent.

[0043] S3. Mix mixture A and reflectivity enhancer in a vacuum mixer to obtain a high-reflectivity, non-electric cooling coating.

[0044] The high-reflectivity substrate includes vinylidene fluoride, polyacrylate, and zinc oxide, and the weight ratio of vinylidene fluoride, polyacrylate, and zinc oxide is 4:4:2.

[0045] The high-reflectivity filler includes nano-calcium carbonate, alumina, and calcium silicate, and the weight ratio of nano-calcium carbonate, alumina, and calcium silicate is 4:4:2.

[0046] The first reinforcing solvent is prepared from xylene, rosin oil, and methyl ethyl ketone, and the weight ratio of xylene, rosin oil, and methyl ethyl ketone is 1:3:1.

[0047] The second reinforcing solvent is copolymerized from dimethyl sulfoxide and polyethylene glycol, and the weight ratio of dimethyl sulfoxide to polyethylene glycol is 4:3.

[0048] In step S1, the reaction stirring speed is 250 rpm and the reaction time is 4 h.

[0049] In step S2, the grinding machine has a mesh size of 650, a rotation speed of 35 rpm, and a grinding time of 8 hours.

[0050] In step S3, the vacuum mixer rotates at 250 rpm and the mixing time is 2.5 h.

[0051] In step S3, the vacuum level is -0.085 MPa.

[0052] In step S3, the weight ratio of mixture A and reflectivity enhancer is 6:2.

[0053] Example 3

[0054] A high-reflectivity, non-electrically cooled coating is prepared by the following steps:

[0055] S1. Mix 250 parts by weight of high reflectivity base material, 50 parts by weight of high reflectivity filler, 30 parts by weight of titanium dioxide, 5 parts by weight of silver powder, 30 parts by weight of aluminum powder, 100 parts by weight of ethyl acetate, 15 parts by weight of dispersant, 10 parts by weight of leveling agent, 9 parts by weight of thickener, and 4 parts by weight of defoamer at a temperature of 70-100℃ to obtain mixture A.

[0056] S2. Prepare a reflectivity enhancer in a grinding mill; the reflectivity enhancer contains 20 parts by weight of kaolin, 20 parts by weight of dolomite, 10 parts by weight of calcium carbonate, 13 parts by weight of zircon sand, 5 parts by weight of barium titanate, 30 parts by weight of the first enhancing solvent and 35 parts by weight of the second enhancing solvent.

[0057] S3. Mix mixture A and reflectivity enhancer in a vacuum mixer to obtain a high-reflectivity, non-electric cooling coating.

[0058] The high-reflectivity substrate includes vinylidene fluoride, polyacrylate, and zinc oxide, and the weight ratio of vinylidene fluoride, polyacrylate, and zinc oxide is 5:6:3.

[0059] The high-reflectivity filler includes nano-calcium carbonate, alumina, and calcium silicate, and the weight ratio of nano-calcium carbonate, alumina, and calcium silicate is 5:6:3.

[0060] The first reinforcing solvent is prepared from xylene, rosin oil, and methyl ethyl ketone, and the weight ratio of xylene, rosin oil, and methyl ethyl ketone is 1.5:4:1.5.

[0061] The second reinforcing solvent is copolymerized from dimethyl sulfoxide and polyethylene glycol, and the weight ratio of dimethyl sulfoxide to polyethylene glycol is 5:4.

[0062] In step S1, the reaction stirring speed is 300 rpm and the reaction time is 5 h.

[0063] In step S2, the grinding machine has a mesh size of 700, a rotation speed of 50 rpm, and a grinding time of 9 hours.

[0064] In step S3, the vacuum mixer speed is 300 rpm and the mixing time is 3 hours.

[0065] In step S3, the vacuum level is -0.09 MPa.

[0066] In step S3, the weight ratio of mixture A and reflectivity enhancer is 7:2.

[0067] Example 4

[0068] This embodiment provides a high-reflectivity, non-electro-cooling coating. Compared with Embodiment 1, the difference in composition is that the high-reflectivity base material is prepared solely from polyacrylate and zinc oxide, and the weight ratio of polyacrylate to zinc oxide is 2:1. Apart from the above differences, the materials, formulation ratios, and preparation procedures used in this embodiment are strictly consistent with those in Embodiment 1.

[0069] Example 5

[0070] This embodiment provides a high-reflectivity, non-electro-cooling coating. Compared to Example 1, the difference in composition is that the high-reflectivity filler is prepared solely from nano-calcium carbonate. Apart from the above differences, the materials, formulation ratios, and preparation procedures used in this embodiment are strictly consistent with those in Example 1.

[0071] Example 6

[0072] This embodiment provides a high-reflectivity, non-electro-cooling coating. Compared with Example 1, the difference in composition is that the first reinforcing solvent is prepared solely from xylene. Apart from the above differences, the materials, formulation ratios, and preparation procedures used in this embodiment are strictly consistent with those in Example 1.

[0073] Example 7

[0074] This embodiment provides a high-reflectivity, non-electro-cooling coating. Compared to Example 1, the difference in composition is that the second reinforcing solvent is prepared solely from dimethyl sulfoxide. Apart from the above differences, the materials, formulation ratios, and preparation procedures used in this embodiment are strictly consistent with those in Example 1.

[0075] Test Case

[0076] 1. Participants

[0077] This test example uses the high-reflectivity non-electro-cooling coatings prepared in Examples 1-7 and commonly available non-electro-cooling coatings as test subjects to conduct relevant performance tests.

[0078] 2. Test Content

[0079] In this test example, the surfaces of the high-reflectivity non-electric cooling coatings prepared in Examples 1 to 7 and the commonly available non-electric cooling coatings were used as coating surfaces. The experiment was conducted in an outdoor environment, with the three coatings spaced 1.2-1.5m apart.

[0080] 3. Test Results

[0081] Table 1. Performance test results of high-reflectivity, non-electro-cooling coating

[0082]

[0083]

[0084] The relevant performance test results of the high-reflectivity non-electric cooling coatings provided in Examples 1 to 7 and commonly available non-electric cooling coatings are shown in Table 1.

[0085] In terms of reflectivity, Examples 1 through 3 all exhibited high reflectivity, ranging from 96.3% to 97.6%. This is mainly attributed to the use of complete high-reflectivity base material formulations (vinylidene fluoride, polyacrylate, zinc oxide) and high-reflectivity filler formulations (nano-calcium carbonate, alumina, calcium silicate), as well as optimized reflectivity enhancement agent preparation. The reflectivity of Example 4 decreased to 94.1%, possibly due to the absence of vinylidene fluoride in the high-reflectivity base material, which affected the optical properties of the coating. The reflectivity of Example 5 was 95.3%, still higher than commonly available coatings, but lower than Examples 1 through 3. This is likely because the high-reflectivity filler only used nano-calcium carbonate, lacking the synergistic effect of alumina and calcium silicate. Examples 6 and 7 showed reflectivity decreases to 93.2% and 93.5%, respectively. This is likely due to incomplete formulations of the first or second reinforcing solvent, affecting the dispersibility and uniformity of the coating, thus reducing reflectivity. Commercially available non-electric cooling coatings have the lowest reflectivity, at only 90.2%, indicating that the coating of this invention has a significant advantage in terms of reflectivity.

[0086] In terms of volume solids content, all embodiments showed relatively high volume solids content, ranging from 57.8% to 62.3%, indicating a high content of active ingredients in the coatings and good coating film quality. Commercially available non-electric cooling coatings also had a relatively high volume solids content (62.1%), but lower reflectivity, suggesting that their active ingredients may not have been fully utilized.

[0087] In the 500-hour weather resistance test, all the coatings in the examples performed excellently, showing no cracks or peeling. This indicates that the coatings have good durability and stability. In contrast, commercially available non-electric cooling coatings showed no cracks or peeling in the 300-hour weather resistance test, but their weather resistance was inferior to that of the coatings in the examples.

[0088] The surface temperatures of Examples 1-3 after 5 hours of sun exposure were relatively low, remaining between 35.7°C and 36.8°C. This indicates that these coatings have high reflective heat insulation performance, effectively reducing the absorption and conduction of solar radiation. The surface temperatures of Examples 4-7 after 5 hours of sun exposure increased slightly, but remained lower than those of commonly available non-electric cooling coatings (46.2°C). This demonstrates that the reflective heat insulation performance of the coatings of this invention is superior to that of commonly available coatings, but there are certain differences between different formulations.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention, but such modifications or substitutions are all within the scope of protection of the present invention.

Claims

1. A high-reflectivity, non-electric cooling coating, characterized in that, The raw materials for preparing the high-reflectivity, non-electric cooling coating, calculated by weight, include: 150-250 parts of high-reflectivity base material, 30-50 parts of high-reflectivity filler, 20-30 parts of titanium dioxide, 2-5 parts of silver powder, 15-30 parts of aluminum powder, 50-100 parts of ethyl acetate, and 50-100 parts of reflectivity enhancer. The high-reflectivity substrate includes vinylidene fluoride, polyacrylate, and zinc oxide, and the weight ratio of vinylidene fluoride, polyacrylate, and zinc oxide is (3~5):(2~6):(1~3). The high-reflectivity filler includes nano-calcium carbonate, alumina, and calcium silicate, and the weight ratio of the nano-calcium carbonate, the alumina, and the calcium silicate is (3~5):(2~6):(1~3). The raw materials used to prepare the reflectivity enhancer, calculated by weight, include: 15-20 parts kaolin, 15-20 parts dolomite, 7-10 parts calcium carbonate, 7-13 parts zircon sand, 2-5 parts barium titanate, 20-30 parts first enhancing solvent, and 25-35 parts second enhancing solvent.

2. The high-reflectivity, non-electric cooling coating as described in claim 1, characterized in that, The first reinforcing solvent is prepared from xylene, rosin oil, and methyl ethyl ketone, and the weight ratio of xylene, rosin oil, and methyl ethyl ketone is (0.5~1.5):(2~4):(0.5~1.5).

3. The high-reflectivity, non-electric cooling coating as described in claim 1, characterized in that, The second reinforcing solvent is copolymerized from dimethyl sulfoxide and polyethylene glycol, and the weight ratio of dimethyl sulfoxide to polyethylene glycol is (3~5):(2~4).

4. The high-reflectivity, non-electric cooling coating as described in claim 1, characterized in that, The raw materials for preparing the high-reflectivity, non-electric cooling coating, calculated by weight, also include: 10-15 parts of dispersant, 5-10 parts of leveling agent, 7-9 parts of thickener, and 2-4 parts of defoamer.

5. A method for preparing a high-reflectivity, electroless cooling coating as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. The high-reflectivity base material, the high-reflectivity filler, the titanium dioxide, the silver powder, the aluminum powder, the ethyl acetate, the dispersant, the leveling agent, and the defoamer are mixed and reacted at a temperature of 70~100℃ to obtain mixture A; S2. A reflectivity enhancing agent is prepared in a grinding mill; the reflectivity enhancing agent contains the kaolin, the dolomite, the calcium carbonate, the zircon sand, the barium titanate, the first enhancing solvent, and the second enhancing solvent; S3. The mixture A and the reflectivity enhancer are placed in a vacuum mixer and stirred to obtain a high-reflectivity, non-electric cooling coating.

6. The preparation method according to claim 5, characterized in that, The vacuum degree of the vacuum condition described in step S3 is (-0.08) ~ (-0.09) MPa.

7. The preparation method according to claim 5, characterized in that, The weight ratio of the mixture A and the reflectivity enhancer in step S3 is (5~7):2.

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