Study On Ramie / PP Wrap Yarn Textile Composites

In this work, ramie fiber was chosed as reinforcing material to prepare ramie reinforced polypropylene composites which had high cost-performance ratio and excellent mechanical properties. So that this paper can provide theoretical basis for practical production. Considering the high viscosity of PP resin, and the problems of dipping, molding, processing and costs, A new type yarn was prepared with the ramie yarn and polypropylene yarn by twisting frame. The formation of skin-core structure can make the matrix and fibers blend intensively.In this paper, 9 kinds of wrap yarns with different parameters were prepared, the cross-sectional and longitudinal section of the wrap yarns were analysized, and the mechanical properties of the wrap yarns were tested.Three different parameters of the wrap yarns(3Hz, 7Hz and 10Hz)were selected to prepare plain weave structure composite prefabricate, the mechanical properties of the wrap yarn fabrics were researched.The results showed that the structure of the yarn and subsequent weaving process were affected by the parameters of wrap yarns.In this paper,the influence factors for preparing the composite of ramie / PP wrap yarn fabric were discussed,such as temperature, pressure and dwell time, and the mechanical properties and the tensile fracture mechanisms of plastic composites were analyzed. The results showed that the mechanical properties of the composites reached the maximum when the molding temperature was 185℃, pressure was 10MPa, holding time was 10min. And the higher parameters can prepare soft covering yarn, which can improve the mechanical properties of composite materials.In this paper, the wrap yarn fabrics were processed by different treatments, such as alkali, maleic anhydride, acetylation, and A-151 treatment. The tensile properties of the composites under these different treatments were tested and the tensile fracture surface shape appearance were observed by SEM,the failure mechanism between fiber and the resin matrix was analysized. By comparison, alkali treatment and A-151 treatment can greatly improve the tensile properties of composites which could increased to 75.6 MPa and 72.8 MPa respectively.