Researchs And Preparations Of Graphite/Epoxy Composites

Graphite has excellent conductive and thermal conductivity, widely used in composite material field, epoxy resin for excellent corrosion resistance, bond properties and high specific strength are widely used in polymer matrix composites matrix. Graphite/epoxy resin composite material can combine the advantages of both, but graphite with epoxy resin compatibility is poorer, graphite in epoxy resins dispersivity is bad, need for surface modification of graphite. This paper USES a kind of long chain organic silicone materials of graphite AEM5700 modified, and with organic silane coupling agent KH550 modified graphite were compared. First using sulfuric acid, strong nitric acid oxidation, again will graphite on AEM5700 with KH550 and surface modification of graphite oxide modified graphite scattered, epoxy resins, using pouring shape, the preparation of an graphite/epoxy resin composite material, and studies the graphite/epoxy resin composite material mechanics performance and graphite in the dispersion of epoxy resin.The results shows that:compared with unmodified graphite, modified by KH550 silane coupling agent, epoxy resin dispersion of graphite in better performance, tensile strength increased from 84.06 MPa to 103.55MPa, bending strength did not change the basic changed from 4107.00 MPa compressive modulus increased to 4330.96 Mpa, elongation 71% increase from 0.78%. Unmodified graphite added after the viscosity of epoxy resin from the initial 1.583Pa. S increased to 1.887 Pa. S (1wt% natural graphite) and 1.934Pa. S (2wt% natural graphite), the KH550 modified epoxy resin viscosity is reduced to 1.471 Pa. S (1wt% modified graphite) and 1.404 P. S (2wt% modified graphite).