Study on Properties of Epoxy Resin Matrix Modified by Carbon Fiber Powder
The method of adding carbon fiber powder to 692-2k epoxy resin was studied to prepare epoxy resin matrix modified with carbon fiber powder.The effects of carbon fiber powder with different dosage(0,15%,20%,25%mass fraction)and size(500 mesh and 1 000 mesh)on tensile and heat resistance properties of epoxy resin matrix were investigated.The experimental results showed that the mechanical properties and heat resistance of epoxy resin matrix could be significantly improved by different size and dosage of carbon fiber powder.The maximum tensile strength and bending strength of epoxy resin matrix without carbon fiber powder were 8 MPa and 10 MPa,respectively.When carbon fiber powder with 500 mesh(25 μm)was added and dosage was 20%,the modified epoxy resin had the maximum tensile strength of 11 MPa,the maximum bending strength was 18 MPa when the content was 15%;when 1 000 mesh carbon fiber powder was added and dosage was 25%,the modified epoxy resin had the maximum bending strength of 14 MPa,and the maximum bending strength was 25 MPa when the content was 20%.At the same time,the modified 692-2k epoxy resin with 25%content of 500 mesh carbon fiber powder was heated at 120℃for 5 consecutive days in a drying oven,and the heat resistance of the material was improved effectively with the minimum weight loss rate.
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