A kind of resin/graphene conductive plastic masterbatch and its preparation method and application

Abstract

The invention relates to a resin / graphene conductive plastic master as well as a blasting stripping preparation method thereof. The conductive plastic master batch consists of the following components in parts by weight: 10-30 parts of EVA (ethylene / vinyl acetate), 70-80 parts of graphite, 0.7-3 parts of a coupling agent, 0.1-2 parts of a surfactant, 0.2-0.8 part of paraffin and 0.1-0.4 part of an antioxidant. The preparation method comprises the following steps: extruding and pelletizing the components through a twin-screw extruder to obtain EVA / graphite small particles; then, heating water, the resin / graphite conductive master batches, a physical foaming agent and an isolating agent in a high-pressure kettle, and then quickly discharging under low pressure to obtain resin / graphene conductive plastic foamed master batch prepared by a blasting stripping method; and extruding and defoaming the conductive plastic foamed master batch through the twin-screw extruder to obtain the resin / graphene conductive plastic master batch. According to the method, the dissolving capacity of a supercritical physical foaming agent is sufficiently utilized, so that a graphite sheet layer can be stripped by expanding under a sudden pressure release condition when the supercritical physical foaming agent is penetrated into the graphite sheet layer. Due to the existence of the resin, the cluster of graphene is effectively blocked, and the obtained volume resistivity can be 0.005 Ohm.cm, so that the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of conductive polymer foaming materials, more specifically, the invention relates to a resin / graphene conductive plastic masterbatch and its preparation method and application. Background technique [0002] Composite conductive polymer materials are made of synthetic resin with good electrical insulation, various conductive fillers and other additives through synthesis, injection, molding or extrusion. Because it not only has a conductive function, but also has the advantages of polymer materials, and its cost is low, it has been widely used in the field of electronics. Commonly used synthetic resins include PE, PS, PC, ABS, PA, PBT, PET, PPO, PPS, ethylene-vinyl acetate copolymer (EVA), low-density polyethylene (LDPE) and high-performance thermoplastic alloys. These synthetic resins not only have excellent chemical resistance, heat resistance, rigidity, and tensile properties, but also have excellent impac...

AI Technical Summary

Problems solved by technology

However, there are many methods for preparing graphene, such as micromechanical exfoliation method, graphite oxide reduction method, deposition growth method, chemical synthesis (bottom-up) method, chemical exfoliation method, etc. Although these methods can obtain monolayer And double-layer graphene can partially meet the research needs of the laboratory, but the output and efficiency are too low, and some methods cause great pollution to the environment due to the use of strong acid and strong alkali

Authorized notification number is that the patent of CN102765717 B discloses a kind of method for preparing graphene, and this method is specifically to use normal hexane or propane as supercritical solvent, inject graphite powder or graphite powder and co-solvent in autoclave, after vacuumizing, in Under a certain temperature and pressure, keep in a supercritical state for a certain period of time, then slightly increase the temperature and pressure, the bursting disc bursts, and prepares a graphene product, but so far, there has been no report on the preparation of graphene / polymer resin by this process

In addition, the current preparation methods of composite materials mainly include solution mixing, melt mixing, and in-situ polymerization. Even if the prepared graphene is prepared, when graphene is compounded with plastic to prepare conductive plastic, the dispersion of graphene in the plastic matrix still remains a problem. is a big problem

The patent with the application number 201010191018.6 discloses a preparation method for in-situ reduction of polymer / graphene composite materials. In this method, graphite oxide is first dispersed in polymer latex, and then the latex is reduced in-situ, and then demulsified, Polymer / graphene composite emulsion is prepared by gelation, drying and other processes, but the method is complex and still cannot avoid the use of dangerous chemicals such as toluene and ethylbenzene; the patent application No. 201310641974.3 "a polymer- "Preparation method of graphene mixture", using the advantages of graphite powder and polymer as granular powder, using dry ball milling to exfoliate the graphite layer in situ to prepare a mixture of polymer and graphene, but this method is difficult in the process of dry ball milling. , the ball mill will still hit the graphene, causing the destruction of the graphene structure and affecting the performance of the graphene; the patent with the authorized announcement number of CN1216096C discloses a polymer / layered inorganic nanocomposite material and its grinding disc shearing preparation method, also There are also the above defects