超细PTFE微粉改性PC复合材料的制备及其性能

Preparation and Properties of Superfine PTFE Powder Modified PC Composite

PC是一种重要的工程塑料,但其耐磨性较差,制约了其应用。利用PTEE的自润滑性与耐磨性能,采用超细PTFE微粉蜡与PC通过共混制备了高耐磨聚西氟乙烯-聚破酸酯(PTFE-PC)复合材料,并进一步研究了PTFE微粉对PC力学性能、加工流动性、热稳定性和滑动磨耗性的影响结果表明,随着PTFE微粉含量的提高,复合材料的力学性能及熔体流动速率均呈现下降趋势。热分解温度明显提高,耐磨性能也明显提升。SEM测试结果表明,PTFE微粉与PC在微观上呈现部分相容,导致复合材料的力学性能和加工流动性明显下降注射成型过程中,PTFE微粉向样条表面迁移,使复合材料的耐滑动磨耗性能显著提升。结果表明,当PTFE微粉蜡含量为10%时,复合材料的综合性能最佳。改性PC有助于扩展PC的应用范围。

PC was an important engineering plastic, but the application had been restricted because of the bad antiwear property. Due to the wear resistance and self-lubricating properties of PTFE , PTFE-PC wear-resisting composite was prepared by the superfine PTFE powder and PC. The effects of mechanical property, processing fluidity , thermal stability and the wearresisting properties of the composite with different content of PTFE fine powder were studied. The results showed that with the increase of PTFE content, the mechanical properties and the melt flow rate of the composite decreased to some extent while the thermal-deconi position temperature increased obviously and wear resistance of PTFE-PC compound material increased remarkably. SEM results indicated that the lower mechanical properties and the melt flow rate were caused by the partly compatibility of the PTFE powder and PC;part of the PTFE particles migrated progressively to the surface of the composite during injection molding which promoted the wear ability of the PTFE-PC composite significantly. The best comprehensive property of the composite was achieved when the content of PTFE was 10%. It was hopeful to expand PC application range.