A METHOD FOR SOLVING THE SURFACE CRACK OF THICK-WALLPULTRUSION PROFILE AND ITS MECHANISM ANALYSIS

Abstract

Abstract: In order to solve the surface crack problem of thick-wall pultrusion profiles, six resin formulas were designed in this paper. For six resin formulas, the dosage of curing agent remained the same and only the dosage of LPA was changed. Firstly, DSC tests were carried out for six formulas at different heating rates. After data processing, activation energy and pre-exponential factors of curing reaction were obtained. Moreover, curing reaction was analyzed by combining curing kinetics, and the optimal resin formula was deduced. Then, six formulas were used for the pultrusion production of 35 mm×20 mm solid rectangular profile, and the optimum resin formula was obtained through the comparison of product end faces, consistent with the theoretical analysis results. Through theoretical and practical analysis, the reasons of end surface cracks of thick-wall pultrusion profiles were obtained, and some rules were summarized. Experimental results show that when the content of LPA was 25%, pultrusion speed was 0.12 m·min^-1, gel temperature is 90 ℃, curing temperature is 100 ℃, the mechanical performance of 35 mm×20 mm solid rectangular profile is good, and the product can satisfy the use requirement. These rules can apply to the pultrusion production practice, which can guarantee the quality control of pultrusion profiles.

Key words: pultrusion process, the crack, curing reaction, process parameters

CLC Number:

TB332

ZHANG Cui-miao, SONG Jin-mei, LIU Peng, MAO Ya-sai. A METHOD FOR SOLVING THE SURFACE CRACK OF THICK-WALLPULTRUSION PROFILE AND ITS MECHANISM ANALYSIS[J]. Fiber Reinforced Plastics/Composites, 2019, 0(5): 71-76.

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