Polymer-based electromagnetic shielding composite material with gradient structure and preparation method thereof

Abstract

The invention discloses a polymer-based electromagnetic shielding composite material with a gradient structure and a preparation method thereof, and belongs to the technical field of electromagnetic shielding material preparation. The invention solves the problem of lack of a method for preparing a polymer-based electromagnetic shielding composite material with a gradient structure from iron-containing dust mud, steel slag, waste plastics and steel fibers in the prior art. According to the technical scheme, the method comprises the following steps that S1, preparing materials; S2, preparation:respectively weighing the iron-containing dust mud, the waste plastics, the steel slag and the steel fibers in proportion, and putting the components into a screw extruder for heating and mixing to amolten state; s3, molding: placing the steel slag-waste plastic-steel fiber polymer-based composite material in a molten state at the lower half part of a mold cavity, placing the iron-containing dust mud-waste plastic polymer matrix composite material in a molten state at the upper half part of the mold cavity, and then performing pressure molding, unloading and demolding to obtain the polymer matrix electromagnetic shielding composite material with the gradient structure. The method is suitable for preparing the electromagnetic shielding composite material.

Description

technical field [0001] The invention belongs to the technical field of preparation of electromagnetic shielding materials, and in particular relates to a polymer-based electromagnetic shielding composite material with a gradient structure and a preparation method thereof. Background technique [0002] Both steel slag and iron-containing dust are solid wastes discharged during the steelmaking process. According to statistics, in 2018, the amount of crude steel and steel slag produced in my country was about 110 million to 190 million tons, and the amount of iron-containing dust and sludge was about 93 million tons. . Steel slag aggregate is a kind of hard, wear-resistant and rough particles. It is placed in the thermoplastic waste plastic matrix in the molten state. No coupling agent is needed under hot pressing conditions. It relies on the interlocking of the molten plastic matrix and the surface pores of the steel slag aggregate The effect can realize the close connection ...

AI Technical Summary

Problems solved by technology

[0003] After literature search, it was found that in the invention patent "Method of using scrap steel slag as filler in the production of plastic products" (application number 200610039377.3), the steel slag was deironed and powdered After grinding, it is mixed with waste plastics and extruded by an extruder to prepare composite materials, but this patent only uses steel slag grinding as a filler in polymer-based composite materials

In the invention patent "Conductive polymer-based composite material prepared from waste and its preparation method" (application number 200610048853.8), the conductive polymer-based composite material is prepared from cuttings and waste plastics generated during the machining of conductive metals. This patent has the following disadvantages: 1. The conductive filler used in this patent is the chips produced during the machining of conductive metals, and iron-containing dust and steel slag are not used; 2. The chips used in this patent need to be crushed and screened to form a particle size The 100-200 mesh particles are ready for use, and the energy consumption is high; ③ this patent needs to use a coupling agent to improve the connection between the reinforced conductive filler and the waste plastic matrix, and enhance the mechanical strength of the composite material; ④ the material prepared by this patent is conductive The composite material has electromagnetic shielding properties, but it does not have a gradient structure, so it cannot simultaneously match the impedance and improve the mechanical strength of the electromagnetic shielding composite material.

[0004] Through the reading of the above documents, it can be found that the polymer-based electromagnetic shielding composite material with gradient structure is prepared from iron-containing dust, steel slag, waste plastics and steel fibers The method has not been reported in the literature