Conductive heat-insulating coating based on aerogel powder and preparation method of conductive heat-insulating coating

Abstract

The invention relates to the technical field of aerogel conductive heat-insulating coatings, aerogel conductive heat-insulating patches and aerogel conductive heat-insulating plates, in particular to a conductive heat-insulating coating based on aerogel powder and conductive powder and a preparation method of the conductive heat-insulating coating. The invention relates to a conductive thermal insulation material, which is a material capable of conducting electricity and blocking partial heat transfer, can conduct electric energy entering the material, and has a thermal insulation function. The defects that a metal conductive material is poor in heat insulation performance and has no flexibility are overcome. A common metal conductive coating can only realize single conduction and cannot insulate heat, but a multi-layer composite conductive and heat-insulating coating prepared by matching with aerogel powder has a conductive function and also has a heat-insulating effect. The method has a good application prospect in the fields of medical instruments and micro-electronics at present.

Description

Technical Field

[0001] The invention relates to the technical field of aerogel conductive thermal insulation coatings, aerogel conductive thermal insulation patches and aerogel conductive thermal insulation boards, in particular to a conductive thermal insulation coating based on aerogel powder and conductive powder and a preparation method thereof. Background Art

[0002] Conductive thermal insulation material refers to a type of material that can conduct electricity while blocking some heat transfer. It can conduct the electrical energy that enters the material.

[0003] Conductive thermal insulation materials can be roughly divided into silicon-based, carbon-based, iron-based, ceramic-based and conductive polymer conductive thermal insulation materials.

[0004] Aerogel conductive thermal insulation material has a unique three-dimensional morphology and conductivity, and has a strong conductive effect on electrical energy. It has the advantages of conductive polymers and carbon-based conductive materials, and has low density, microstructure design, high conductivity efficiency, good thermal insulation effect, and the ability to adjust thermal insulation by adjusting parameters. It overcomes the shortcomings of carbon-based conductive materials, such as poor thermal insulation and lack of flexibility.

[0005] In particular, aerogel conductive thermal insulation materials have better dispersibility than other conductive thermal insulation materials, providing a core conductive thermal insulation material for the development of a new generation of lightweight, high-efficiency, conductive thermal insulation coatings.

[0006] The electrical conductivity of aerogel conductive coating is relatively high, and the single conductive mechanism limits its practical application. In particular, ordinary metal conductive coatings can only conduct electricity but not insulate, so it is difficult to achieve the performance of conducting electricity and insulating at the same time. To solve the above problems, two strategies are usually adopted: one is to compound with conductive particles, such as copper, aluminum and their compounds, to introduce conductivity and improve the thermal insulation properties of the material. This method has a simple preparation process and a good effect of improving conductivity and thermal insulation, but because ordinary metal coatings have poor thermal insulation effects, they are very easy to conduct heat. When current passes through the coating, a large amount of heat is generated, which seriously restricts the thermal insulation properties of the material. Another strategy is to rationally design a multi-layer conductive thermal insulation coating so that the material has the characteristics of multi-interface thermal insulation and conductivity, which currently has good application prospects in the field of electromagnetic heating.

[0007] Existing conductive coatings are generally of single design, and the conductivity of a single functional coating is limited and can only be conducted alone, which cannot meet the requirements of electromagnetic heating and other uses that require conductive heat insulation.

[0008] We provide a conductive thermal insulation coating based on aerogel powder and a preparation method to solve the above-mentioned problems. Summary of the invention

[0009] The object of the present invention is to provide a conductive thermal insulation coating based on aerogel powder and a preparation method thereof, so as to solve the problems in the background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] The multilayer conductive thermal insulation coating based on aerogel powder is characterized in that it includes a surface layer, an intermediate layer and a bottom layer, the surface layer is made of epoxy resin or a soluble polymer; the intermediate layer and the bottom layer include epoxy resin or a soluble polymer, aerogel powder, copper powder, aluminum powder, a dispersant, a defoaming agent, and a curing agent. The epoxy resin or soluble polymer is used as a substrate, and aerogel powder, copper powder, aluminum powder or a combination of the three is used as a conductive thermal insulation medium. The required dispersant, defoaming agent or curing agent is selected to obtain the required conductive thermal insulation coating, and the multilayer conductive thermal insulation coating is produced by roller coating.

[0012] The preparation method of the conductive heat-insulating coating based on aerogel powder comprises the following steps: Step 1, adding epoxy resin, solvent and additive into a dispersion tank and stirring at high speed for 20 minutes;

[0013] Step 2, then add the functional filler, stir evenly, and disperse at high speed for 20 minutes;

[0014] Step 3: Place the dispersed material into a sand mill and grind it to a fineness of less than 50 μm;

[0015] Step 4: transfer the ground material into a paint mixing kettle, add additives and stir at medium speed for 15-20 minutes until it is uniform;

[0016] Step 5: Adjust the viscosity of the evenly stirred material. After the adjustment is completed, the required coating is obtained. After the finished product is tested for qualified performance, it is filtered and packaged.

[0017] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions: In one optional solution: the solvent is selected as diluent X-7 type.

[0018] In an optional solution: the functional filler is selected from aerogel powder, copper powder, aluminum powder or bentonite.

[0019] In an optional solution: the copper powder is copper powder of 60-80 mesh.

[0020] In an optional solution, the auxiliary agent is a wetting and dispersing agent or a defoaming agent.

[0021] In an optional solution: the wetting and dispersing agent is BYK-190 type wetting and dispersing agent.

[0022] In an optional solution: the defoaming agent is XQ-ADD 252.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention adopts a multi-layer design, and aerogel powder, copper powder and aluminum powder are involved in the surface layer, the middle layer and the bottom layer, so as to prevent heat loss, conduct current, further achieve heat insulation and heat preservation while achieving electrical conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the process flow of the present invention.

[0026] Figure 2 This is the image of aerogel powder (transmission electron microscope) in the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the double-layer heat-insulating and conductive coating of epoxy resin-aerogel powder and copper powder in the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the three-layer heat-insulating conductive coating of epoxy resin-aerogel powder, copper powder and aluminum powder in the present invention.

[0029] Figure 5 It is a schematic diagram of the structure of the three-layer heat-insulating conductive coating of epoxy resin-aerogel powder, copper powder and aluminum powder in the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 2 As shown, the conductive heat-insulating coating based on aerogel powder includes a surface layer, an intermediate layer, and a bottom layer, wherein the surface layer is made of epoxy resin or a soluble polymer;

[0032] The middle layer and the bottom layer include epoxy resin or soluble polymer, aerogel powder, aluminum powder, copper powder, dispersant, defoaming agent, and curing agent. The epoxy resin or soluble polymer is used as the base material, and aerogel powder, aluminum powder, copper powder or a combination of the three is used as the thermal insulation conductive aggregate. The required dispersant, defoaming agent or curing agent is selected to prepare the required thermal insulation conductive coating. The multi-layer thermal insulation conductive coating is prepared by roller coating, or the thermal insulation conductive patch and the thermal insulation conductive board are prepared by extrusion (injection method, pressing method, molding method can also be used); the present invention is specifically described by taking the preparation process of the multi-layer thermal insulation conductive coating as an example, but is not limited to the multi-layer thermal insulation conductive coating, and should also be extended to thermal insulation conductive patches and thermal insulation conductive boards.

[0033] The mass fractions of the aerogel monomers are 6%, 10%, 16% and 18% respectively, and the mass fractions of the copper powders are 10%, 15% and 30% respectively. Figure 3-Figure 5As shown, when 18% aerogel powder and 15%-30% copper powder are used as fillers with a thickness of 1 mm, and epoxy resin is used as an adhesive with a thickness of 1 mm, a heat-insulating and conductive effect is achieved.

[0034] like Figure 1 As shown, the preparation method of the conductive thermal insulation coating based on aerogel powder includes the following steps:

[0035] Step 1, adding epoxy resin, solvent and auxiliary agent into a dispersion tank and stirring at high speed for 20 minutes; the solvent is selected as diluent X-7 type; the auxiliary agent is selected as wetting dispersant or defoaming agent; the defoaming agent is selected as XQ-ADD 252 type.

[0036] Step 2, then add the functional filler, stir evenly, and disperse at high speed for 20 minutes; the functional filler is selected from aerogel powder, copper powder or bentonite; the copper powder is selected from copper powder 60-80 mesh; the wetting dispersant is BYK-190 type wetting dispersant;

[0037] Step 3: Place the dispersed material into a sand mill and grind it to a fineness of less than 50 μm;

[0038] Step 4: transfer the ground material into a paint mixing kettle, add additives and stir at medium speed for 15-20 minutes until it is uniform;

[0039] Step 5: Adjust the viscosity of the evenly stirred material. After the adjustment is completed, the required coating is obtained. After the finished product is tested for qualified performance, it is filtered and packaged.

[0040] In summary, the multilayer heat-insulating conductive material is composed of single-layer structures with different parameters. The single-layer heat-insulating conductive structure was prepared by hot rolling, dipping, film manufacturing and roller coating, and then the single-layer structure was combined and designed to prepare the multilayer heat-insulating conductive material. This material has great potential in the field of electromagnetic heating heat-insulating conductive materials.

[0041] In the design of multi-layer thermal insulation conductive materials, the principle of gradual thermal insulation and upper and lower conduction is often used to increase the conductivity of the material. Generally, the conductivity of the material is achieved by changing the concentration of copper powder or changing the type of material. Multi-layer thermal insulation conductive materials achieve different working conditions through multi-layer design to improve thermal insulation and conductivity, and improve thermal insulation and conductivity performance by optimizing the thickness and electromagnetic parameters of each layer.

[0042] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. Conductive thermal insulation coating based on aerogel powder, characterized by: It comprises a surface layer, an intermediate layer and a bottom layer, wherein the surface layer is made of epoxy resin or soluble polymer; The middle layer and the bottom layer include epoxy resin or soluble polymer, aerogel powder, copper powder, aluminum powder, dispersant, defoaming agent, and curing agent. The epoxy resin or soluble polymer is used as the base material, copper powder, aluminum powder or a combination of the two is used as the conductive powder, and aerogel powder is used as the thermal insulation powder. The required dispersant, defoaming agent or curing agent is selected to prepare the required conductive thermal insulation coating, and a multi-layer microwave absorbing coating is prepared by roller coating.

2. A method for preparing a conductive thermal insulation coating based on aerogel powder, characterized in that: The steps include: Step 1, add epoxy resin, solvent and additives into a dispersion tank and stir at high speed for 20 minutes; Step 2, then add the functional filler, stir evenly, and disperse at high speed for 20 minutes; Step 3: Place the dispersed material into a sand mill and grind it to a fineness of less than 50 μm; Step 4: transfer the ground material into a paint mixing kettle, add additives and stir at medium speed for 15-20 minutes until it is uniform; Step 5: Adjust the viscosity of the evenly stirred material. After the adjustment is completed, the required coating is obtained. After the finished product is tested for qualified performance, it is filtered and packaged.

3. The method for preparing a conductive thermal insulation coating based on aerogel powder according to claim 2, characterized in that: The solvent selected is diluent X-7 type.

4. The method for preparing a conductive thermal insulation coating based on aerogel powder according to claim 2, characterized in that: The functional filler is selected from aerogel powder, copper powder, aluminum powder or bentonite.

5. The method for preparing a conductive thermal insulation coating based on aerogel powder according to claim 2, characterized in that: The copper powder is selected from copper powder 60-80 mesh.

6. The method for preparing a conductive thermal insulation coating based on aerogel powder according to claim 2, characterized in that: The auxiliary agent is a wetting and dispersing agent or a defoaming agent.

7. The method for preparing a conductive thermal insulation coating based on aerogel powder according to claim 4, characterized in that: The wetting and dispersing agent is BYK-190 type wetting and dispersing agent.

8. The method for preparing a conductive thermal insulation coating based on aerogel powder according to claim 4, characterized in that: The defoamer is XQ-ADD 252.

Images