Preparation And Properties Of Epoxy Resin Composites Reinforced With Nonga / Cotton Blended Fabrics

In this study, kenaf and cotton as raw materials, and kenaf fibre was refined to reduce its stiffness and improve its poor spinability. Treated kenaf and cotton was blended to spin yarns with different ratio. And on this basis, blended fabrics, prepregs and composite materials were prepared. Explored the best preparation of prepreg, and studied the effects of different blending ratio on the composites, further kenaf/cotton blended fabric reinforced epoxy composites applied research were analyzed.kenaf/cotton(40/60) blended yarn was spun with treated kenaf fibres and cotton. The effects of carding way, spinning method and twist factor on properties of yarn were explored. It was concluded that roller type carding, sirospun and twist factor of 380 is the optimum combination to spin the blending yarn.Multi-index optimization method of orthogonal experiment was utilized to optimize the process parameters of making prepreg. The results show that the optimal process parameters of making prepreg are that process parameters of glue concentration of 30%, temperature of 65 ℃, gauge of 0.5 mm, and speed of 20 Hz. According to the best process of making prepreg, the properties of prepreg are resin content of 45.82%, volatile matter content of 1.32%, fluidity of 28.85%, a gel time of 7 min.Different blending ratio of kenaf/cotton fabric reinforced epoxy composites were prepared by molding process, and analyzed the properties of composites. The results show that kenaf/cotton(40/60) blended fabric reinforced epoxy composite have best tensile strength of 101.9 MPa and modulus of 6.16 GPa, flexural strength of 189.64 MPa and modulus of 12.14 GPa, shear strength of 17.47 MPa and water absorption of 9%.Molding composite and sandwich composite were made with flame-retardant treated kenaf/cotton (40/60) blended fabrics. The results show that the mechanical properties and flame resistance of composites can meet the performance requirements of the automotive and building interior materials respectively. In addition, in order to understand the usefulness of the composite, and further study the heat aging properties of the molded composites.