阅读说明：本技术 具有电磁屏蔽性能的轻质高强复合材料及其制备方法 (Light high-strength composite material with electromagnetic shielding performance and preparation method thereof ) 是由 葛舟 葛鹰 于 2020-12-15 设计创作，主要内容包括：本发明涉及一种具有电磁屏蔽性能的轻质高强复合材料,包括泡沫金属层、树脂层和基层,所述泡沫金属层和基层通过树脂层复合而成。制备方法如下：S1：备料：合适面积的有屏蔽效能的多孔泡沫金属材料；树脂调配后的混合物,基层；覆膜两张；S2：铺置一层覆膜,在目标面积内均匀涂抹50％质量的上述树脂混合物；S3：在涂抹树脂的覆膜上铺置多孔泡沫金属材料；S4：压平多孔泡沫金属材料,并让树脂混合物充分浸润多孔泡沫金属材料；S5：铺置基层材料,压平；S6：在基层材料是均匀涂抹另外50％质量的树脂混合物；S7：铺设另外一层覆膜压平；S8：使用常温固化,固化完成后揭除两层覆膜即可。本发明可得质量轻,强度高的复合材料。(The invention relates to a light high-strength composite material with electromagnetic shielding performance, which comprises a foam metal layer, a resin layer and a base layer, wherein the foam metal layer and the base layer are compounded through the resin layer. The preparation method comprises the following steps: s1: preparing materials: a suitable area of porous foam metal material with shielding effectiveness; a resin-blended mixture, a base layer; laminating two films; s2: laying a layer of film, and uniformly coating 50% of the resin mixture by mass in a target area; s3: laying a porous foam metal material on the film coated with the resin; s4: flattening the porous foam metal material and allowing the resin mixture to fully infiltrate the porous foam metal material; s5: laying a base material and flattening; s6: evenly coating the resin mixture with the other 50% of the mass of the base material; s7: laying another layer of film and flattening; s8: curing at normal temperature, and removing the two layers of the coating after curing. The invention can obtain the composite material with light weight and high strength.)

1. A light high-strength composite material with electromagnetic shielding performance is characterized in that: the composite material comprises a foam metal layer (1), a resin layer (2) and a base layer (3), wherein the foam metal layer (1) and the base layer (3) are formed by compounding the resin layer (2).

2. The lightweight high-strength composite material with electromagnetic shielding property as claimed in claim 1, wherein: the base layer (3) is one of a 3D fabric, a carbon fiber or a metal plate.

3. The lightweight high-strength composite material with electromagnetic shielding property as claimed in claim 1, wherein: the foam metal layer (1) is one of porous foam, double-faced attached foam, foam copper, foam nickel, foam stainless steel, foam titanium, foam silver or foam aluminum.

4. The lightweight high-strength composite material with electromagnetic shielding property as claimed in claim 2, wherein: the 3D fabric is made of a raw material of glass fiber, polyester fiber, aramid fiber, carbon fiber or basalt fiber through three-dimensional weaving.

5. The lightweight high-strength composite material with electromagnetic shielding property as claimed in claim 1, wherein: the thickness of the foam metal layer (1) is 0.1-10 mm, and the thickness of the base layer (3) is 2-22 mm.

6. A preparation method of a light high-strength composite material with electromagnetic shielding performance is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

s1: preparing materials: preparing the following raw materials; a suitable area of porous foam metal material with shielding effectiveness; a suitable area of base material; uniformly stirring and blending the resin, the curing agent, the accelerator and the diluent to obtain a mixture; the mass ratio of the mixed substance after the resin blending to the base layer is as follows: 0.8: 1-1.5: 1; laminating two films;

s2: laying a layer of film on a workbench or a die, and uniformly coating 50% of the resin mixture in a target area;

s3: laying a porous foam metal material on the film coated with the resin;

s4: flattening the porous foam metal material and allowing the resin mixture to fully infiltrate the porous foam metal material; s5: laying a base material, and continuously flattening;

s6: evenly coating the resin mixture with the other 50% of the mass of the base material, and continuously flattening;

s7: laying another layer of film, and continuously flattening;

s8: curing treatment is carried out by normal temperature curing or baking, and two layers of coating films are removed after curing.

7. The method for preparing the light high-strength composite material with electromagnetic shielding performance according to claim 6, wherein the method comprises the following steps: the resin material is prepared before the process is started, and the mass ratio of the prepared resin to the base material is as follows: 1.2: 1.

8. the method for preparing the light high-strength composite material with electromagnetic shielding performance according to claim 6, wherein the method comprises the following steps: the film is a PE film or a PP film, and the thickness of the film is 0.06 mm-0.12 mm.

9. The method for preparing the light high-strength composite material with electromagnetic shielding performance according to claim 6, wherein the method comprises the following steps: the method is characterized in that: and during normal-temperature curing treatment, the curing time is 24-36 h.

10. The method for preparing the light high-strength composite material with electromagnetic shielding performance according to claim 6, wherein the method comprises the following steps: during the baking and curing treatment, the curing temperature is 80 ℃, and the curing time is 6 hours.

Technical Field

The invention relates to a preparation method of a shielding material, belonging to the field of new materials.

Background

With the development of modern high and new technologies, the problems of electromagnetic interference and electromagnetic compatibility caused by electromagnetic waves become more and more serious, which not only causes interference and damage to electronic instruments and equipment to influence normal work, but also pollutes the environment. Therefore, it is required to develop a high-performance electromagnetic shielding material.

Some of the traditional electromagnetic shielding materials adopt metal plates, but the traditional electromagnetic shielding materials do not have the characteristic of light weight; some electromagnetic shielding materials adopt plate porous foam metal, but the electromagnetic shielding materials do not have the characteristic of high strength. Therefore, it is necessary to develop an electromagnetic shielding material having a light weight per unit area and a high strength.

Disclosure of Invention

The invention aims to provide a composite material with light weight, high strength and electromagnetic shielding performance and a preparation method thereof.

In order to achieve the purpose, the technical scheme of the invention is as follows: the light high-strength composite material with the electromagnetic shielding performance comprises a foam metal layer, a resin layer and a base layer, wherein the foam metal layer and the base layer are compounded through the resin layer.

Preferably, the base layer is formed by three-dimensionally weaving a 3D fabric by taking one of glass fiber, polyester fiber, aramid fiber, carbon fiber or basalt fiber as a raw material.

Preferably, the foamed metal layer is one of porous foam, double-sided attached foam, copper foam, nickel foam, foamed stainless steel, titanium foam, silver foam or aluminum foam.

Preferably, the thickness of the foam metal layer is 0.1 mm-10 mm, and the thickness of the base layer is 2 mm-22 mm.

After the structure is adopted, the foam metal layer is added on the base layer and compounded through the resin, the foam metal layer has a good shielding effect, the base layer has the characteristic of high strength, and the foam metal layer and the base layer are combined to achieve the advantages of light weight and high strength.

A preparation method of a light high-strength composite material with electromagnetic shielding performance is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

s1: preparing materials: preparing the following raw materials; a suitable area of porous foam metal material with shielding effectiveness; a suitable area of base material; uniformly stirring and blending the resin, the curing agent, the accelerator and the diluent to obtain a mixture; the mass ratio of the mixed substance after the resin blending to the base layer is as follows: 0.8: 1-1.5: 1; laminating two films;

s2: laying a layer of film on a workbench or a die, and uniformly coating 50% of the resin mixture in a target area;

s3: laying a porous foam metal material on the film coated with the resin;

s4: flattening the porous foam metal material and allowing the resin mixture to fully infiltrate the porous foam metal material; s5: laying a base material, and continuously flattening;

s6: evenly coating the resin mixture with the other 50% of the mass of the base material, and continuously flattening;

s7: laying another layer of film, and continuously flattening;

s8: curing treatment is carried out by normal temperature curing or baking, and two layers of coating films are removed after curing.

Preferably, the resin material is prepared before the process is started, and the mass ratio of the prepared resin to the base material is as follows: 1.2: 1.

preferably, the covering film is a PE film or a PP film, and the thickness of the covering film is 0.1 mm-1 mm.

Preferably, the curing time is 24-36 h during the normal-temperature curing treatment.

Preferably, the curing temperature in the baking curing treatment is 80 ℃, and the curing time is 6 h.

After the method is adopted, the porous foam metal material and the base material are compounded through the resin, and the resin can be completely infiltrated through the porous structure after the resin is coated because the porous foam metal has the porous structure, and the porous foam metal material and the base material can be perfectly compounded after the resin is solidified, so that the electromagnetic shielding material with light weight and high strength is formed.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples, which are given in conjunction with the accompanying drawings.

The first embodiment is as follows: the utility model provides a light high-strength composite material with electromagnetic shielding performance, includes foam metal level 1, resin layer 2 and basic unit 3, and foam metal level 1 is porous foamy copper, and basic unit 3 is the fine fabric of 3D glass, and foam metal level 1 and basic unit 3 are formed through the 2 complex of resin layer. The thickness of the foam metal layer 1 is 1mm, and the thickness of the base layer 3 is 10 mm.

The preparation method comprises the following steps:

s1: preparing materials: preparing the following raw materials; a suitable area of porous copper foam with shielding effectiveness; a suitable area of base material; uniformly stirring and blending the resin, the curing agent, the accelerator and the diluent to obtain a mixture; the mass ratio of the mixed substance after the resin blending to the base layer is as follows: 1.2: 1; two PE films are covered, and the thickness of each PE film is 0.5 mm;

s2: placing a mould to be formed on a workbench, coating a layer of release agent on the mould to ensure the smoothness of the surface of a product during demoulding, laying a layer of coating film on the mould, and uniformly coating 50% of the resin mixture by mass in a target area;

s3: laying porous foam copper on the film coated with the resin;

s4: flattening the porous foam copper by using a roller, and fully soaking the porous foam metal material by using the resin mixture; s5: laying a base material, and continuously flattening;

s6: evenly coating the resin mixture with the other 50% of the mass of the base material, and continuously flattening;

s7: laying another layer of film, and continuously flattening;

s8: curing treatment is carried out by normal temperature curing or baking, and two layers of coating films are removed after curing. When the normal-temperature curing treatment is used, the curing time is 24-36 h. When the baking curing treatment is used, the curing temperature is 80 ℃ and the curing time is 6 h.

The base layer 3 is a 3D fabric, and is formed by connecting the fabrics of the upper and lower surface layers by Z-direction fibers forming a core, and the typical spatial characteristics are that the fibers of the core are in a 8 shape along the warp direction, and the height and the spacing of the 8 shape can be adjusted. The thickness, the fiber density and the fiber thickness of the upper surface layer and the lower surface layer can be designed according to different use requirements. The functional properties of the 3D fabric can be combined with the use requirements of the composite material. Overcomes the defects of easy layering, poor impact resistance and inconvenient bending forming of sandwich materials such as honeycombs, foams, balsawood and the like, and has the advantages of light weight, high strength, good corrosion resistance and the like.

The microstructure of the foam copper of the foam metal layer 1 has an open-pore three-dimensional structure, has good flexibility, good mechanical and processing properties and excellent shielding performance, and can realize diffuse reflection of sound waves, microwaves and electromagnetic waves on the surface of the foam copper, thereby achieving the effects of sound attenuation and electromagnetic shielding. The pore size and porosity are high and low, and the thickness and structure of the material can be designed and manufactured.

The foam metal layer 1 is different from an electromagnetic shielding mechanism of solid metal due to the uniqueness of the structure, and electromagnetic waves can generate reflection loss, absorption loss, multiple reflection loss in a hole wall, multiple reflection loss in a foam hole and eddy current loss on the surface and the inside of the foam metal, so that different shielding effectiveness levels can be formed by the size of a gap of the foam metal. The size of the gap is from small to large, and the shielding grade is from low to high. The electromagnetic shielding effectiveness of a common civil grade is below 40dB, the electromagnetic shielding effectiveness of a military equipment chassis needs to reach 60dB, and a shielding room or a shielding cabin needs to reach 100 dB.

In order to meet different shielding requirements, in the second embodiment, another layer of porous metal foam material may be additionally laid between step S6 and step S7 to enhance the shielding effect.

The foam metal layer 1 of the invention can be produced to be 0.06mm in the thinnest thickness, has good flexibility and mechanical energy absorption, and has extremely low quality. The shielding material can be widely applied to various parts of new energy automobiles, the field of biological medical treatment, the field of high-speed rails and the field of aviation.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.