자동차 범퍼빔용 유리섬유/폴리프로필렌 프리프레그의 제조 및 특성

Abstract

GMT, a thermoplastic composite in sheet state, is laminates of matrix sheet and glass fiber mat, and is commercially available as sheet form for press work. This GMT-Sheet is widely used in various internal and external components of automobile due to lightweightness and mechanical strength. One of the issues in GMT-Sheet is the difference of flow molding for glass fiber and matrix during molding process. Because of this difference, molded product shows nonhomogeneity and anisotropic properties. In this study, to eliminate degree of nonhomogeneity and fiber orientation during the molding of GMT-Sheet, GFRP prepreg is fabricated using roving fiber and polypropylene. Using the fabricated GFRP prepreg, GFRP-Sheet is prepared through 0/90° fabric approach. Structural stability, degree of impregnation, surface roughness, moldability, flow analysis, and continuous manufacturing process on GFRP-Sheet are conducted. Purpose of this study is to remove inhomogeneous fiber orientation using GFRP composite at automobile component formation. After preparing glass fiber prepreg, degree of impregnation of glass fiber and polypropylene was derived. In addition, tensile strength and microstructure of prepreg was evaluated. Degree of impregnation for prepreg was improved along with low pulling speed, high resin temperature, and longer die length. According to SEM micrograph, homogeneous fiber orientation was observed, and there was no separation of matrix and glass fiber. Therefore, application of plain weaving on prepreg in GFRP composite can have superior flow-rate. Also, fundamental data that can be referred in industry field are gathered.