关键词: 先进拉挤, 预浸料, DSC, 固化度, 孔隙率

Abstract: Advanced pultrusion molding technology takes prepreg as raw material, realizes the mechanical property designability of the parts through the combination of different layers, and has unique advantages in controlling the production cost and flexibility. This subject selects X850 prepreg for research, analyzes the difference between its typical hot pressing tank forming process and advanced pultrusion process. The function of each interval in the forming process is analyzed for the characteristics of hot-pressure curing in advanced pultrusion molding. The curing kinetics of resin in X850 prepreg is measured through differential scanning calorimetry. The selection principle of temperature system in each interval is determined. In order to prevent the formation and growth of pores, the pressure system of each interval is reasonably selected. A curing process experimental scheme is designed by means of orthogonal experiment, and the influence trend of multi-interval temperature system and pressure system on the forming quality of parts is studied. The specimen is prepared by the equipment designed by the laboratory, and the scheme No. 6(with pretreatment temperature at 160 ℃ for 30 min, curing temperature at 180 ℃ for 20 min and curing pressure at 0.8 MPa)is selected as the final pultrusion process in the orthogonal test scheme, for which the bending strength, interlaminar shear strength and porosity are characterized.

Key words: advanced pultrusion, prepreg, DSC, curing degree, void content