Electromagnetic shielding heat-insulating coating based on aerogel powder and preparation method

Abstract

The invention discloses an electromagnetic shielding heat-insulating coating based on aerogel powder and a preparation method, relates to the technical field of aerogel electromagnetic shielding heat-insulating coatings, aerogel electromagnetic shielding heat-insulating patches and aerogel electromagnetic shielding heat-insulating plates, and particularly relates to an electromagnetic shielding heat-insulating coating based on aerogel powder and electromagnetic shielding powder and a preparation method. An electromagnetic shielding thermal insulation material is a material capable of shielding electromagnetic waves and blocking partial heat transfer, can shield partial electromagnetic waves entering the material, and has a thermal insulation function at the same time. The defects that a metal electromagnetic shielding material is poor in heat insulation performance and has no flexibility are overcome. A common metal electromagnetic shielding coating can only realize single electromagnetic shielding and cannot insulate heat, and a multi-layer composite electromagnetic shielding heat-insulating coating prepared by matching with aerogel powder has an electromagnetic shielding 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 present invention relates to the technical field of aerogel electromagnetic shielding thermal coatings, aerogel electromagnetic shielding thermal insulation patches and aerogel electromagnetic shielding thermal insulation boards, and in particular to an electromagnetic shielding thermal insulation coating based on aerogel powder and electromagnetic shielding powder and a preparation method thereof. Background Art

[0002] Electromagnetic shielding and thermal insulation materials refer to a type of material that can provide electromagnetic shielding while blocking some heat transfer. It can shield electromagnetic radiation entering the material. Electromagnetic shielding and thermal insulation materials can be roughly divided into silicon-based, carbon-based, iron-based, ceramic-based and conductive polymer electromagnetic shielding and thermal insulation materials.

[0003] Aerogel electromagnetic shielding and thermal insulation materials have a unique three-dimensional morphology and electromagnetic shielding performance, and have a good shielding effect on electromagnetic waves. They have the advantages of electromagnetic shielding polymers and carbon-based electromagnetic shielding materials, and have low density, microstructure design, high electromagnetic shielding efficiency, good thermal insulation effect, and can adjust the thermal insulation by adjusting parameters; they overcome the shortcomings of carbon-based electromagnetic shielding materials, such as poor thermal insulation and lack of flexibility.

[0004] In particular, aerogel electromagnetic shielding and thermal insulation materials have better dispersibility than other electromagnetic shielding and thermal insulation materials, providing core electromagnetic shielding and thermal insulation materials for the development of a new generation of lightweight, high-efficiency, electromagnetic shielding and thermal insulation coatings.

[0005] Aerogel electromagnetic shielding coatings have a high electromagnetic shielding rate, but a single electromagnetic shielding mechanism limits their practical applications. In particular, ordinary metal electromagnetic shielding coatings can only provide electromagnetic shielding but not thermal insulation, so it is difficult to achieve electromagnetic shielding and thermal insulation performance at the same time. To solve the above problems, two strategies are usually adopted: one is to compound with electromagnetic shielding particles, such as copper, magnetic powder and their compounds, to introduce electromagnetic shielding properties and improve the thermal insulation properties of the material. This method has a simple preparation process and has a good effect in improving electromagnetic shielding and thermal insulation, but because ordinary metal coatings have poor thermal insulation effects, they are very easy to conduct heat. When shielding electromagnetic waves in special components, integrated thermal insulation is not possible, which seriously restricts the thermal insulation properties of the material. Another strategy is to rationally design a multi-layer electromagnetic shielding and thermal insulation coating so that the material has the characteristics of multi-interface thermal insulation and electromagnetic shielding, which currently has good application prospects in the field of medical devices.

[0006] Existing electromagnetic shielding coatings are generally of single design, and electromagnetic shielding of single functional coatings is limited, and can only provide electromagnetic shielding alone, and cannot meet the requirements of electromagnetic shielding heat insulation and other use requirements that require electromagnetic shielding heat insulation.

[0007] We provide an electromagnetic shielding and thermal insulation coating based on aerogel powder and a preparation method to solve the above-mentioned problems. Summary of the invention

[0008] The object of the present invention is to provide an electromagnetic shielding and heat insulation coating based on aerogel powder and a preparation method thereof, so as to solve the problems in the background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The invention discloses a multilayer electromagnetic shielding and thermal insulation coating based on aerogel powder, which is characterized by comprising a surface layer, an intermediate layer and a bottom layer, wherein the surface layer is made of epoxy resin or a soluble polymer; the intermediate layer and the bottom layer comprise epoxy resin or a soluble polymer, aerogel powder, copper powder, magnetic powder, a dispersant, a defoaming agent and a curing agent, wherein the epoxy resin or the soluble polymer is used as a base material, and aerogel powder, copper powder, magnetic powder or a combination of the three are used as an electromagnetic shielding and thermal insulation medium, and the required dispersant, defoaming agent or curing agent is selected to obtain the required electromagnetic shielding and thermal insulation coating, and the multilayer conductive thermal insulation coating is produced by roller coating.

[0011] 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 10 minutes;

[0012] Step 2, then add the functional filler, stir evenly, and disperse at high speed for 10 minutes;

[0013] Step 3: Place the dispersed material into a sand mill and grind it to a fineness of less than 30 μm;

[0014] Step 4: transfer the ground material into a paint mixing kettle, add additives and stir at medium speed for 10-15 minutes until it is uniform;

[0015] 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.

[0016] 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-6 type.

[0017] In an optional solution: the functional filler is selected from aerogel powder, copper powder, aluminum powder or bentonite.

[0018] In an optional solution, the copper powder is 80-100 mesh.

[0019] In an optional solution, the auxiliary agent is a wetting and dispersing agent or a defoaming agent.

[0020] In an optional solution: the wetting and dispersing agent is BYK-189 type wetting and dispersing agent.

[0021] In an optional solution, the defoaming agent is XQ-ADD 251.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention adopts a multi-layer design, and the surface layer, the middle layer and the bottom layer all have aerogel powder, copper powder and magnetic powder, so as to prevent heat loss, shield electromagnetic waves, further achieve thermal insulation and electromagnetic shielding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the process flow of the present invention.

[0025] Figure 2 This is the image of aerogel powder (transmission electron microscope) in the present invention.

[0026] 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.

[0027] 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 magnetic powder in the present invention.

[0028] Figure 5 It is a schematic diagram of the structure of the three-layer thermal insulation and electromagnetic shielding coating of epoxy resin-aerogel powder, copper powder and magnetic powder in the present invention. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figure 2 As shown, the electromagnetic shielding and thermal insulation 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; the intermediate layer and the bottom layer include epoxy resin or a soluble polymer, aerogel powder, magnetic powder, copper powder, a dispersant, a defoaming agent and a curing agent. The epoxy resin or soluble polymer is used as a substrate, and aerogel powder, magnetic powder, copper powder or a combination of the three is used as a thermal insulation electromagnetic shielding aggregate. The required dispersant, defoaming agent or curing agent is selected to obtain the required thermal insulation electromagnetic shielding coating, and a multi-layer thermal insulation electromagnetic shielding coating is prepared by roller coating, or a thermal insulation electromagnetic shielding patch and a thermal insulation electromagnetic shielding plate are prepared by extrusion (injection method, pressing method, molding method can also be used); the present invention takes the preparation process of the multi-layer thermal insulation electromagnetic shielding coating as an example for specific explanation, but is not limited to the multi-layer thermal insulation electromagnetic shielding coating, and should also be extended to thermal insulation electromagnetic shielding patches and thermal insulation electromagnetic shielding plates.

[0031] 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 5 As 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 insulation and electromagnetic shielding effect is achieved.

[0032] like Figure 1 As shown, the preparation method of the electromagnetic shielding and heat insulation coating based on aerogel powder comprises the following steps;

[0033] Step 1, add epoxy resin, solvent and auxiliary agent into a dispersion tank and stir at high speed for 10 minutes; the solvent is selected as diluent X-6 type; the auxiliary agent is selected as wetting dispersant or defoaming agent; the defoaming agent is selected as XQ-ADD 251 type.

[0034] Step 2, then add the functional filler, stir evenly, and disperse at high speed for 10 minutes; the functional filler is selected from aerogel powder, copper powder or bentonite; the copper powder is selected from copper powder 80-100 mesh; the wetting dispersant is BYK-189 type wetting dispersant;

[0035] Step 3: Place the dispersed material into a sand mill and grind it to a fineness of less than 30 μm;

[0036] Step 4: transfer the ground material into a paint mixing kettle, add additives and stir at medium speed for 10-15 minutes until it is uniform;

[0037] 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.

[0038] In summary, the multilayer structure thermal insulation electromagnetic shielding material is composed of single-layer structures with different parameters. The single-layer thermal insulation electromagnetic shielding structure was prepared by hot rolling, dipping, film manufacturing and roller coating, and then the single-layer structure was combined to prepare the multilayer structure thermal insulation electromagnetic shielding material. This material has great potential in the field of medical devices.

[0039] In the design of multi-layer structure thermal insulation electromagnetic shielding materials, the principle of gradual insulation and upper and lower conduction is often used to improve the electromagnetic shielding property of the material. Generally, the electromagnetic shielding ability of the material is achieved by changing the copper powder concentration or changing the material type. Multi-layer structure thermal insulation electromagnetic shielding materials achieve different working conditions matching through multi-layer design to improve the thermal insulation electromagnetic shielding ability, and improve the thermal insulation electromagnetic shielding efficiency by optimizing the thickness and shielding parameters of each layer.

[0040] The above is only a specific embodiment 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. An electromagnetic shielding and heat 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, magnetic powder, dispersant, defoaming agent, and curing agent. The epoxy resin or soluble polymer is used as the base material, copper powder, magnetic powder or a combination of the two is used as the shielding 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 an electromagnetic shielding and heat-insulating 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 10 minutes; Step 2, then add the functional filler, stir evenly, and disperse at high speed for 10 minutes; Step 3: Place the dispersed material into a sand mill and grind it to a fineness of less than 30 μm; Step 4: transfer the ground material into a paint mixing kettle, add additives and stir at medium speed for 10-15 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 an electromagnetic shielding and heat-insulating coating based on aerogel powder according to claim 2, characterized in that: The solvent selected is diluent X-6 type.

4. The method for preparing an electromagnetic shielding and heat-insulating coating based on aerogel powder according to claim 2, characterized in that: The functional filler is selected from aerogel powder, copper powder, magnetic powder or bentonite.

5. The method for preparing an electromagnetic shielding and heat-insulating coating based on aerogel powder according to claim 2, characterized in that: The copper powder is selected from copper powder 80-100 mesh.

6. The method for preparing an electromagnetic shielding and heat-insulating 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 an electromagnetic shielding and heat-insulating coating based on aerogel powder according to claim 4, characterized in that: The wetting and dispersing agent is BYK-189 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 251.

Images