Method for preparing coated electromagnetic shielding material

Abstract

The invention relates to the technical field of electromagnetic shielding material preparation, and in particular to a method for preparing a coated electromagnetic shielding material. Toluene diisocyanate, isophorone diisocyanate and polyethylene glycol as raw materials are reacted to obtain an elastic polyurethane prepolymer, and a photo-curing initiator, nano-spherical silver powder and flake silver powder are added to the elastic polyurethane prepolymer to obtain the coated electromagnetic shielding material. The electromagnetic shielding material can coat light matrixes such as plastics to achieve electromagnetic shielding effect, and the cost of the electromagnetic shielding material is effectively controlled while the electromagnetic shielding effect is guaranteed. Nano-conductive particles aggregate with each other by Brownian motion of the nano-conductive particles to form a conductive network, and the conductivity of the electromagnetic shielding material after curing is improved. In addition, in the process of UV light curing of the coating, the filling effect of conductive silver particles in pores among resin particles is better, so that shrinkage of the coating decreases during curing, and the application prospect is broad.

Description

technical field [0001] The invention relates to the technical field of preparation of electromagnetic shielding materials, in particular to a preparation method of a coated electromagnetic shielding material. Background technique [0002] With the improvement of people's living standards, the development of society and the advancement of science and technology, various household appliances, computers and other office automation equipment, mobile communication equipment, etc. have rapidly entered the office and home environment, which has brought great benefits to people's life and work. It is convenient, but it also brings electromagnetic pollution to people. Electromagnetic radiation will affect people's health, and it will also cause serious interference to electronic instruments and equipment, making their working procedures disordered and causing erroneous actions. Electromagnetic radiation can also leak information, making computers and other instruments without inform...

AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is that the current traditional high-efficiency electromagnetic shielding materials are metal plates, such as steel plates, galvanized thin steel plates, copper plates, aluminum plates and other materials with good electrical conductivity. However, metal shielding materials have high density, are easy to corrode, and are not easy to Disadvantages such as processing greatly limit their applicable fields. When graphene is used as an electromagnetic shielding material, it is easy to form macroscopic aggregates due to the van der Waals force. A method for preparing a coated electromagnetic shielding material is provided.