锻压技术

热固性预浸料模压成型工艺参数实验研究

英文标题：Experimental study on compression molding process parameters for thermosetting prepreg

作者：孙奋丽郭平安边翊金康王小刚赵敏

单位：1.中机精密成形产业技术研究院（安徽）股份有限公司 2.北京机电研究所有限公司

分类号：TB332

出版年,卷(期):页码：2021,46(3):146-150

摘要：

通过研究热固性预浸料模压成型（Propreg Compression Molding, PCM）复合材料层合板制备过程中固化压力与树脂流失量之间的关系，对比不同树脂含量的预浸料在模压成型后的力学性能，发现最佳力学性能对应的预浸料树脂含量为38%。为了进一步提高PCM模压制品力学性能的稳定性，将模压后树脂含量保持在38%的固化压力作为固定参数，对模具温度和固化时间进行了16组正交实验，检测层合板的力学性能，并分析树脂与纤维织物界面之间的微观结合情况。结果表明：当固化压力为3800 kN时，可以将树脂含量为40%的预浸料在模压后的树脂含量控制在38%左右，并在模具温度为155 ℃、预热时间为40 s、保压时间为440 s时，得到抗拉强度为520.18 MPa、冲击韧性为32.35 J·cm-2、综合力学性能最好同时微观缺陷最少的样品。经现场工艺验证，实验得到的规律和工艺参数组合可应用于热固性复合材料汽车电池包上盖的批量生产中。

By studying the relationship between curing pressure and resin loss amount during the preparation of composite laminates by thermosetting prepreg compression molding (PCM), comparing the mechanical properties of prepregs with different resin contents after compression molding, the best mechanical properties were found that the corresponding prepreg resin content was 38%. In order to further improve the stability of mechanical properties for PCM molded products, taking the curing pressure when the resin content was maintained at 38% after compression molding as a fixed parameter, and sixteen sets of orthogonal experiments were carried out on the combination of mold temperature and curing time to detect the mechanical properties of laminate and analyze the microscopic bond conditions between resin and fiber fabric interface. The results show that when the curing pressure is 3800 kN, for the prepreg with a resin content of 40%, the resin content can be controlled at about 38% after compression molding, and when the mold temperature is 155 ℃, the preheating time is 40 s and the holding time is 440 s, a sample with the tensile strength of 520.18 MPa, the impact toughness of 32.35 J·cm-2 is obtained, which has the best comprehensive mechanical properties and the least micro defects. The on-site process verification shows that the law and process parameter combination obtained from the experiment can be applied to the mass production of automotive battery pack upper cover for thermosetting composite materials.

基金项目：

国家科技重大专项课题（2018ZX04001026）；科技部“科技助力经济2020”重点专项项目

孙奋丽(1995-)，女，硕士研究生 E-mail：384805944@qq.com 通讯作者：边翊(1976-)，男，硕士，研究员 E-mail：bianyi@brimet.ac.cn

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