A kind of preparation method of electromagnetic shielding pa6/ps composite foam material

Abstract

The invention provides a preparation method of electromagnetic shielding PA6 / PS composite foam material: dispersing functionalized carbon nanotubes in molten caprolactam monomers to obtain caprolactam / functionalized carbon nanotube suspensions; at 120-140°C, Add graphene and polystyrene into the obtained caprolactam / functionalized carbon nanotube suspension, heat and stir for 2-4 hours, then remove water under vacuum at 130-160°C, add initiator sodium hydroxide and activator toluene diisocyanate, Obtain a polymerization reaction system, polymerize at 150-200°C for 20-60 minutes, and obtain a composite material; the obtained composite material is subjected to supercritical CO 2 Foaming treatment to obtain the electromagnetic shielding PA6 / PS composite foam material; the electromagnetic shielding PA6 / PS composite foam material prepared by this method can meet the requirements of low reflection, high absorption and high electromagnetic shielding efficiency.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, in particular to a preparation method of electromagnetic shielding PA6 / PS composite foam material. Background technique [0002] With the development of modern high-tech and the advent of the fifth-generation mobile communication network (5G) era, our life and work will become faster and more convenient, but the more serious electromagnetic interference (EMI) problems brought about by electromagnetic waves are also will be something we especially need to address. Highly conductive metals have great advantages as electromagnetic shielding materials, but their inherent disadvantages, such as high price, high quality, poor corrosion resistance, and high reflectivity to electromagnetic waves, limit their practical applications. Carbon materials other than metal materials are also excellent in electrical conductivity, and there are many kinds, such as nano-carbon materials such as g...

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Problems solved by technology

Patent application numbers 201611242257.3 and 201721000670.9 respectively report the use of carbon fiber, ultra-fine nickel powder and PA6 to melt blend the electromagnetic shielding material of PA6 and prepare a multilayer PS sheet as the electromagnetic shielding material. Adding wave-absorbing fillers to a system at the same time meets the needs of the current market that tends to absorb dominant electromagnetic shielding materials, but the addition of carbon fiber and ultra-fine nickel powder is relatively large, and both carbon fiber and ultra-fine nickel powder need to be pre-treated before they can be used. Patent No. 2 The multilayer structure is used to absorb, reflect and reabsorb electromagnetic waves. The multilayer structure includes a PS sheet layer, a shielding layer made of carbon fibers, and an insulating layer, but the gap formed by the poor bonding force between layers will affect its reflection of electromagnetic waves. and absorption, which ultimately affects its electromagnetic shielding effectiveness, and the preparation process of the two patents is relatively cumbersome, but the raw materials of the present invention do not need pretreatment, and the material with higher electromagnetic shielding effectiveness is obtained by one-step method

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