Rare earth thermal insulation coating and preparation method thereof

Abstract

The invention provides a rare earth heat insulation coating and a preparation method thereof. The coating comprises the following components in parts by weight: 50-60 parts of acrylic resin, 10-15 parts of polyurethane modified epoxy resin, 5-8 parts of nano rare earth powder, 3-5 parts of filler, 0.5-1 part of a coalescing agent, 1-2 parts of a defoaming agent, 1-3 parts of a dispersing agent, 0.5-1 part of an ultraviolet light absorber and 1-2 parts of a silane coupling agent. Wherein the nano rare earth powder comprises lanthanum oxide powder, cerium chloride powder and yttrium hexaboride powder, and the filler comprises nano hollow microspheres, nano calcium carbonate and nano aluminum silicate. The rare earth heat insulation coating has excellent heat insulation effect and mechanical property, and can be applied to various scenes.

Description

Technical Field

[0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a rare earth thermal insulation coating and a preparation method thereof. Background Art

[0002] In recent years, energy shortages have received increasing attention, and energy conservation and emission reduction have become the main themes of the times. In applications where glass is used extensively, such as building windows, ceilings, and car windows, the thermal radiation of light can lead to a significant increase in energy consumption. Insulation products on the market, such as insulating glass and Low-e glass, are expensive, offer poor insulation, are difficult to replace, and are difficult to market. While some research has yielded promising results on transparent thermal insulation coatings, these studies have not yet fully addressed issues, particularly insulation efficiency. The thermal insulation performance of existing thermal insulation coatings remains suboptimal. Summary of the Invention

[0003] In view of this, the present invention aims to provide a rare earth thermal insulation coating to solve the above problems.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A rare earth thermal insulation coating comprises, by weight, 50-60 parts of acrylic resin, 10-15 parts of polyurethane-modified epoxy resin, 5-8 parts of nano rare earth powder, 3-5 parts of filler, 0.5-1 part of film-forming aid, 1-2 parts of defoamer, 1-3 parts of dispersant, 0.5-1 part of ultraviolet absorber, and 1-2 parts of silane coupling agent; wherein the nano rare earth powder comprises lanthanum oxide powder, cerium chloride powder, and yttrium hexaboride powder, and the filler comprises nano hollow microbeads, nano calcium carbonate, and nano aluminum silicate.

[0006] Furthermore, the mass ratio of the lanthanum oxide powder, the cerium chloride powder and the yttrium hexaboride powder is (2-3):1:(0.5-1).

[0007] Furthermore, the particle size of the nano rare earth powder is 50-100 nm.

[0008] Furthermore, the mass ratio of the nano hollow microspheres, nano calcium carbonate and nano aluminum silicate is 2:1:1.

[0009] Furthermore, the acrylic resin is graphene oxide modified acrylic resin.

[0010] Furthermore, the film-forming aid is one of alcohol ester-12 and Texanol; the defoaming agent is a silicone defoaming agent; the dispersant is one or more of polyvinyl pyrrolidone, tetrapropylammonium bromide, polyether modified silicone oil, and modified acrylate copolymer; the ultraviolet absorber is one or more of UV-234, UV-531, and UV-9; and the silane coupling agent is one of KH560, KH550, and KH570.

[0011] The present invention also provides a method for preparing the rare earth thermal insulation coating as described above, the method comprising the following steps:

[0012] 1) adding nano rare earth powder and filler into a grinder respectively, and adding a silane coupling agent for grinding;

[0013] 2) Preliminarily mixing the treated nano rare earth powder and filler with other raw materials using ultrasound to obtain a mixed slurry;

[0014] 3) The mixed slurry is introduced into a ball mill for mixing and grinding to obtain a rare earth thermal insulation coating.

[0015] Furthermore, in step 1), the grinding rate is 700-1000 r / min, and the grinding time is 20-30 min; the grinding of the nano rare earth powder is carried out under the protection of an inert gas;

[0016] In step 2), the ultrasonic power is 150W-300W, and the ultrasonic time is 10-20min; the ultrasonic mode is pulsed, that is, the ultrasonic operation is 2-5s and the rest is 1-2s;

[0017] In step 3), the grinding rate is 1000-1050 r / min, and the grinding time is 50-80 min.

[0018] The present invention also provides an application of the rare earth thermal insulation coating as described above in the field of thermal insulation.

[0019] Furthermore, the rare earth thermal insulation coating is evenly coated on the surface of the object by spin coating or wire rod coating, and dried at 150-250° C. for 30-60 minutes to solidify the coating. The coating thickness of the rare earth thermal insulation coating is 0.10-0.15 mm.

[0020] Compared with the prior art, the rare earth thermal insulation coating of the present invention has the following advantages:

[0021] The rare earth thermal insulation coating described in the present invention has excellent thermal insulation effect and mechanical properties, with an ultraviolet blocking rate of more than 90%, an infrared reflectivity of more than 85%, a thermal conductivity coefficient of ≤0.025W / (m·K), and a coating compressive strength of more than 65Mpa. The rare earth thermal insulation coating can be used in various scenarios. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] A rare earth thermal insulation coating, comprising, by weight:

[0026] 50 parts of graphene oxide modified acrylic resin, 10 parts of polyurethane modified epoxy resin, 5.5 parts of nano rare earth powder, 3 parts of filler, 0.5 parts of film-forming aid, 1 part of defoaming agent, 1 part of dispersant, 0.5 parts of ultraviolet absorber, and 1.2 parts of silane coupling agent; wherein the nano rare earth powder includes lanthanum oxide powder, cerium chloride powder and yttrium hexaboride powder in a mass ratio of 2:1:0.5, and the filler includes nano hollow microbeads, nano calcium carbonate and nano aluminum silicate in a mass ratio of 2:1:1.

[0027] The method of graphene oxide modified acrylic resin is:

[0028] Graphene oxide is modified with a silane coupling agent to introduce active groups such as amino or epoxy groups; the modified GO reacts with semi-blocked isocyanate to form an intermediate; the intermediate is grafted with hydroxypropyl methacrylate (HPMA) and finally copolymerized with acrylic monomer to form graphene oxide-modified acrylic resin.

[0029] The film-forming aid is Texanol; the defoaming agent is an organosilicon defoaming agent; the dispersant is polyvinyl pyrrolidone; the ultraviolet absorbers are UV-234 and UV-531; and the silane coupling agent is KH560.

[0030] The preparation method of rare earth thermal insulation coating comprises the following steps:

[0031] 1) Three kinds of nano rare earth powders and fillers were added to a grinder, and a silane coupling agent was added and ground; the grinding rate was 700 r / min, and the grinding time was 20 min; the grinding of the nano rare earth powders was carried out under the protection of inert gas N2; the particle size of the three kinds of nano rare earth powders obtained after grinding was 70±5 nm;

[0032] 2) Preliminary mixing of the treated nano rare earth powder and filler with other raw materials using ultrasound to obtain a mixed slurry; the ultrasound power is 200 W, the ultrasound time is 15 minutes, and the ultrasound adopts a pulse mode, that is, working for 3 seconds and resting for 1 second;

[0033] 3) The mixed slurry is introduced into a ball mill for mixing and grinding to obtain a rare earth thermal insulation coating.

[0034] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0035] Tests have shown that the coating has good dispersion and no agglomeration. At room temperature, it has a UV blocking rate of 94%, an infrared reflectivity of 90%, a thermal conductivity of 0.024W / (m·K), and a coating compressive strength of 68Mpa.

[0036] Example 2

[0037] A rare earth thermal insulation coating, comprising, by weight:

[0038] 55 parts of graphene oxide modified acrylic resin, 13 parts of polyurethane modified epoxy resin, 7 parts of nano rare earth powder, 4 parts of filler, 0.8 parts of film-forming aid, 1.5 parts of defoaming agent, 1.5 parts of dispersant, 0.8 parts of ultraviolet absorber, and 1.5 parts of silane coupling agent; wherein the nano rare earth powder includes lanthanum oxide powder, cerium chloride powder and yttrium hexaboride powder in a mass ratio of 2:1:1, and the filler includes nano hollow microspheres, nano calcium carbonate and nano aluminum silicate in a mass ratio of 2:1:1.

[0039] The film-forming aid is alcohol ester-12; the defoaming agent is an organic silicone defoaming agent; the dispersant is tetrapropylammonium bromide; the ultraviolet absorber is UV-531; and the silane coupling agent is KH550.

[0040] The preparation method of the rare earth thermal insulation coating is as described in Example 1.

[0041] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0042] Tests have shown that the coating has good dispersion and no agglomeration. At room temperature, it has a UV blocking rate of 93%, an infrared reflectivity of 89%, a thermal conductivity of 0.022W / (m·K), and a coating compressive strength of 67Mpa.

[0043] Example 3

[0044] A rare earth thermal insulation coating, comprising, by weight:

[0045] 60 parts of graphene oxide modified acrylic resin, 15 parts of polyurethane modified epoxy resin, 8 parts of nano rare earth powder, 5 parts of filler, 1 part of film-forming aid, 2 parts of defoaming agent, 3 parts of dispersant, 1 part of ultraviolet absorber, and 2 parts of silane coupling agent; among them, the nano rare earth powder includes lanthanum oxide powder, cerium chloride powder and yttrium hexaboride powder in a mass ratio of 3:1:0.8, and the filler includes nano hollow microspheres, nano calcium carbonate and nano aluminum silicate in a mass ratio of 2:1:1.

[0046] The film-forming aid is Texanol; the defoaming agent is a silicone defoaming agent; the dispersant is a modified acrylate copolymer; the ultraviolet absorbers are UV-531 and UV-9; and the silane coupling agent is KH560.

[0047] The preparation method of the rare earth thermal insulation coating is as described in Example 1.

[0048] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0049] Tests have shown that the coating has good dispersion and no agglomeration. At room temperature, it has a UV blocking rate of 93%, an infrared reflectivity of 89%, a thermal conductivity of 0.025W / (m·K), and a coating compressive strength of 67Mpa.

[0050] Comparative Example 1

[0051] The difference from Example 1 is that the cerium chloride powder is replaced by cerium oxide powder, and the rest is the same as Example 1.

[0052] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0053] Testing revealed that the coating was inferior, with noticeable agglomeration. This is because cerium oxide easily aggregates and has low infrared reflectivity, while cerium chloride has strong UV absorption properties. At room temperature, it had a UV blockage of 83%, an infrared reflectivity of 87%, a thermal conductivity of 0.032 W / (m·K), and a compressive strength of 65 MPa.

[0054] Comparative Example 2

[0055] The difference from Example 1 is that the yttrium hexaboride powder is replaced by yttrium oxide powder, and the rest is the same as Example 1.

[0056] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0057] The coating was tested to be of poor quality and had sedimentation. At room temperature, it had a UV blockage of 91%, an infrared reflectivity of 89%, a thermal conductivity of 0.025 W / (m·K), and a compressive strength of 65 MPa.

[0058] Comparative Example 3

[0059] The difference from Example 1 is that the filler is nano hollow microspheres and nano calcium carbonate in a mass ratio of 2:1, and the rest is the same as Example 1.

[0060] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0061] Testing showed that the coating had good dispersibility, with a UV blockage of 86%, an infrared reflectivity of 89%, a thermal conductivity of 0.028 W / (m·K) at room temperature, and a compressive strength of 71 MPa. The lack of aluminum silicate would result in insufficient high-temperature stability and interfacial bonding, leading to easy delamination and shedding.

[0062] Comparative Example 4

[0063] The difference from Example 1 is that the filler is nano hollow microspheres and nano aluminum silicate in a mass ratio of 2:1, and the rest is the same as Example 1.

[0064] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0065] Testing showed that the coating had good dispersibility, with a UV blockage of 89%, an infrared reflectivity of 90%, a thermal conductivity of 0.025 W / (m·K) at room temperature, and a compressive strength of 64 MPa. However, the impact strength at -20°C decreased by 20% compared to Example 1, and the coating became more brittle and prone to cracking.

[0066] Comparative Example 5

[0067] The difference from Example 1 is that the filler is nano-calcium carbonate and nano-aluminum silicate in a mass ratio of 1:1, and the rest is the same as Example 1.

[0068] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0069] Tests have shown that the coating has good dispersibility, with a UV blocking rate of 88%, an infrared reflectivity of 75%, a thermal conductivity of 0.035W / (m·K) and a coating compressive strength of 70Mpa at room temperature.

[0070] Comparative Example 6

[0071] The difference from Example 1 is that the acrylic resin is an unmodified ordinary acrylic resin, and the rest is the same as Example 1.

[0072] The obtained coating was coated on the glass surface with a coating thickness of 0.12 mm, and dried at 160° C. for 45 minutes to solidify the coating.

[0073] After testing, the coating's dispersibility deteriorated, with a UV blocking rate of 85%, an infrared reflectivity of 79%, a thermal conductivity of 0.038W / (m·K) and a coating compressive strength of 51Mpa at room temperature.

[0074] From the above comparison, it can be seen that only the coatings of Examples 1-3 prepared according to the present invention have the best thermal insulation and mechanical properties, while the thermal insulation and mechanical properties will be reduced to varying degrees after the coating formula is changed.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rare earth thermal insulation coating, characterized in that: The coating comprises, by weight, 50-60 parts of acrylic resin, 10-15 parts of polyurethane-modified epoxy resin, 5-8 parts of nano rare earth powder, 3-5 parts of filler, 0.5-1 part of film-forming aid, 1-2 parts of defoamer, 1-3 parts of dispersant, 0.5-1 part of ultraviolet absorber, and 1-2 parts of silane coupling agent; wherein the nano rare earth powder comprises lanthanum oxide powder, cerium chloride powder, and yttrium hexaboride powder, and the filler comprises nano hollow microbeads, nano calcium carbonate, and nano aluminum silicate.

2. The rare earth thermal insulation coating according to claim 1, characterized in that: The mass ratio of lanthanum oxide powder, cerium chloride powder and yttrium hexaboride powder is (2-3):1:(0.5-1).

3. The rare earth thermal insulation coating according to claim 1, characterized in that: The particle size of nano rare earth powder is 50-100nm.

4. The rare earth thermal insulation coating according to claim 1, characterized in that: The mass ratio of nano hollow microbeads, nano calcium carbonate and nano aluminum silicate is 2:1:

1.

5. The rare earth thermal insulation coating according to claim 1, characterized in that: The acrylic resin is graphene oxide modified acrylic resin.

6. The rare earth thermal insulation coating according to claim 1, characterized in that: The film-forming aid is one of alcohol ester-12 and Texanol; the defoaming agent is a silicone defoaming agent; the dispersant is one or more of polyvinyl pyrrolidone, tetrapropylammonium bromide, polyether modified silicone oil, and modified acrylate copolymer; the ultraviolet absorber is one or more of UV-234, UV-531, and UV-9; and the silane coupling agent is one of KH560, KH550, and KH570.

7. A method for preparing the rare earth thermal insulation coating according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: 1) adding nano rare earth powder and filler into a grinder respectively, and adding a silane coupling agent for grinding; 2) Preliminarily mixing the treated nano rare earth powder and filler with other raw materials using ultrasound to obtain a mixed slurry; 3) The mixed slurry is introduced into a ball mill for mixing and grinding to obtain a rare earth thermal insulation coating.

8. The method for preparing the rare earth thermal insulation coating according to claim 7, characterized in that: In step 1), the grinding rate is 700-1000 r / min, and the grinding time is 20-30 min; the grinding of the nano rare earth powder is carried out under the protection of an inert gas; In step 2), the ultrasonic power is 150W-300W, and the ultrasonic time is 10-20min; the ultrasonic mode is pulsed, that is, the ultrasonic operation is 2-5s and the rest is 1-2s; In step 3), the grinding rate is 1000-1050 r / min, and the grinding time is 50-80 min.

9. Use of the rare earth thermal insulation coating according to any one of claims 1 to 6 in the field of thermal insulation.

10. Use of the rare earth thermal insulation coating according to claim 9 in the field of thermal insulation, characterized in that: The rare earth thermal insulation coating is evenly applied on the surface of the object by spin coating or wire rod coating, and dried at 150-200°C for 30-60 minutes to solidify the coating. The coating thickness of the rare earth thermal insulation coating is 0.10-0.15mm.