Electroconductive plastic with high electrical conductivity and preparation method thereof

Abstract

The invention provides an electroconductive plastic with high electrical conductivity and a preparation method thereof. The electroconductive plastic is composed of a plastic matrix, electroconductive polyaniline, a dispersant and an antioxidant. The preparation method comprises the following steps: 1. synthesis of the electroconductive polyaniline: adding aniline to distilled water on the basis of using an inorganic acid as a doping agent, dissolving ammonium persulfate in the distilled water to obtain an ammonium persulfate solution, dropwise adding the ammonium persulfate solution at a constant speed, carrying out suction filtration, washing and drying; and 2. preparation of the electroconductive plastic: firstly adding a plastic matrix resin and the dispersant to a mixing roll, mixingfor some time; then adding the plastic matrix resin; then adding polyaniline until the two components are completely mixed to obtain a mixture; introducing the mixture to a mold, hot-pressing; and cooling to room temperature. According to the invention, a hot-melting and blending method is utilized to prepare the electroconductive plastic with high electrical conductivity. The obtained electroconductive plastic can be used for overcoming the defects that the existing electroconductive plastic has large filling amount of electroconductive filler, poor compatibility of the filler and the plastic matrix and the like, the volume conductivity of the electroconductive plastic provided by the invention can be adjusted within a large range, and the retention rates of original mechanical properties and processing properties of the plastic base body are high.

Description

technical field [0001] The invention relates to a conductive material and a preparation method thereof, in particular to a high-conductivity conductive plastic and a preparation method thereof. Background technique [0002] Conductive plastics are functional polymer materials composed of conductive substances and plastic matrix in a certain way. Such materials can be widely used as antistatic materials, electrode materials, heating element materials, electromagnetic wave shielding materials, etc., and have many applications in antistatic, circuit electronic components, sensors, electromagnetic shielding and other fields. Commonly used conductive fillers can be divided into three categories: antistatic agent system, metal system and carbon system. Antistatic agent-filled conductive plastics have a low conductivity of 10 -13 -10 -10 S / cm, generally used as antistatic products; metal-filled conductive plastics are mainly used in electromagnetic wave shielding occasions, and ...

AI Technical Summary

Problems solved by technology

The use of traditional conductive fillers such as carbon-based fillers to prepare conductive plastics has significant advantages such as low price and wide source of raw materials, but as the filling amount of conductive fillers increases, the compatibility between the filler and the plastic matrix will be poor, which will affect the original properties of the matrix plastic. Mechanical properties, especially when there is a high requirement for the electrical conductivity of the material, this problem becomes more prominent

For example: Chinese patent CN1083767A discloses a method for preparing a conductive plastic that can be used as a heating film, which requires a conductive filler (carbon black) content weight fraction up to 60%, such a high filling of carbon black will increase the melting of the system The bulk viscosity will reduce the impact strength of the material, and it will also cause adverse effects such as carbon black particles are easy to fall off and cause clean room pollution.