Electromagnetic shielding co-extruded wood-plastic composite material and preparation method thereof

Abstract

The invention discloses an electromagnetic shielding co-extruded wood-plastic composite material, which comprises a surface layer and a core layer. The preparation method comprises: S100, weighing thecomponent raw materials of the surface layer and the core layer by weight percentage; S200, spraying the weighted electromagnetic shielding agent to a wood fiber surface, then mixing the electromagnetic shielding agent coated wood fiber with polyvinyl chloride resin, an environment-friendly stabilizer, a lubricant and a coupling agent, and then performing drying to obtain a surface layer mixture;S300, mixing the polyvinyl chloride resin, wood fiber, calcium carbonate, the environment-friendly stabilizer, the coupling agent, a foaming agent and a foaming regulator in the core layer components, and then conducting drying to obtain the core layer mixture; S400, putting the surface layer mixture and the core layer mixture in different extruder hoppers respectively for melting and plasticizing, and subjecting the molten and plasticized products to extrusion and shaping synchronously through a die; and S500, finally conducting cooling, shaping and cutting in order to obtain the wood-plastic composite material. According to the invention, the electromagnetic shielding effectiveness of the wood-plastic composite material and the overall strength of the material are improved.

Description

technical field [0001] The invention relates to the field of wood-plastic composite materials, in particular to an electromagnetic shielding co-extruded wood-plastic composite material and a preparation method thereof. Background technique [0002] With the rapid development of wireless communication technology, problems such as electromagnetic interference, electromagnetic information leakage, and electromagnetic environmental pollution have become more and more serious. At present, almost all electronic and electrical equipment are inevitably disturbed by electrical and magnetic signals. Therefore, the problem of electromagnetic interference has been widely concerned, and the research on electromagnetic shielding materials has also become a hot spot, which is of great significance to the sustainable development strategy of the national economy. Compared with the traditional metal shielding materials, the current electromagnetic shielding materials are developing in the di...

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Problems solved by technology

[0007] (1) Since the conductive particles need to be dispersed in the whole system, the addition amount is large and the production cost is high;

[0008] (2) The dispersion and compatibility of conductive particles in the whole system are poor, the electromagnetic shielding effect is not good, and the reflection loss is too large, which is easy to cause secondary electromagnetic interference

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