Composite plastics for shielding electromagnetic radiation and use thereof

Abstract

A composite plastics shielding electromagnetic radiation are related to a special function plastics with electromagnetic shielding function, which is trilaminar combined type structure, wherein both inner and outer layer are made of ordinary engineering plastics, while mid-layer is made of mulriple electromagnetic shielding material based on finely divided metal / conducting polymer and resin. Thethickness range of the inner and outer engineering plastics is from 0.05mm to 10 mm, and the thickness range of electromagnetic shielding material formed by finely divided metal / conducting polymer and resin is from 0.1mm to 4 mm. During 30MHz-1500MHz, the shielded efficient is higher than 40dB. Formed plastic housing with electromagnetic shielding function is characterized in diselectroconductibility not only on crust where electronic aid contact with human body, but also on interface of endoconch. At the same time, that is also merited in use safety, preventing short circuit between electronic component and crust and high effectiveness of shielding. It could be used to make the crust of electronic aid with electromagnetic shielding function.

Description

technical field [0001] The invention relates to engineering plastics, in particular to special functional plastics with electromagnetic shielding effect. Background technique [0002] With the advancement of electronic technology and electronic equipment, the harm of electromagnetic waves to the normal use of electronic equipment and human health needs to be controlled. Inventing a plastic product with electromagnetic shielding effect, which is used to make the shell of electronic equipment products with electromagnetic shielding effect, has a great application prospect. [0003] Although there are researches on conductive plastics at home and abroad, they mainly focus on making conductive plastics by using carbon fiber, nickel-plated carbon fiber or stainless steel fiber through plastic manufacturing process. According to the introduction of the literature "Research on the Properties of LDPE-Stainless Steel Fiber Electromagnetic Shielding Material", "Research Progress of S...

AI Technical Summary

Problems solved by technology

Generally speaking, its production method is more complicated, the technical content is high, and the process is difficult to control.

At the same time, it is difficult to obtain high shielding efficiency by adding a small amount of conductive fibers, and the addition of conductive fillers makes the injection molding process difficult, so it is still in the research stage and it is difficult to apply on a large scale.

At the same time, this kind of conductive plastic has conductivity in practical applications, so the safety of use and the short circuit of electronic components also limit the application field.

[0004] At present, the shells of electronic equipment that need to achieve electromagnetic shielding are often stamped from metal plates, such as computer cases, microwave oven shells, etc., such metal shells are often difficult to make products with complex shapes, and electronic equipment shells made of metal materials are often It has a heavy weight, and the seams are difficult to seal, which will cause electromagnetic wave leakage, so it is difficult to achieve electromagnetic shielding for some electronic devices, such as the shell of a mobile phone

However, if the electromagnetic shielding coating that is being researched and developed is simply coated on the plastic shell, it is often difficult to guarantee the long-term electromagnetic shielding effectiveness due to the problems of coating resistance and wear resistance.