废硫化胶粉增韧BMC的实验研究

本文以废硫化胶粉（ＲＰ）作为活性填料来改性不饱和聚酯团状模塑料（ＢＭＣ），系统研究了配方、工艺等因素的影响，以及ＲＰ的增韧作用。结果表明，增韧效果与ＲＰ的预处理工艺、种类、填充量、粒径有关。当单体／ＲＰ＝５０／５０，ＲＰ粒径为０．２８ｍｍ，填充量为２０ｐｈｒ时，ＢＭＣ的冲击强度从５．２ｋＪ／ｍ２提高到１１．４ｋＪ／ｍ２，固化收缩率从０．５％下降至０．１％，而其他物理机械性能基本保持不变。透射电镜、电子探针测试证明，ＲＰ与ＢＭＣ基体在相界面附近能够形成梯度ＩＰＮ，加强了两相界面结合，使冲击强度提高。

EXPERIMENTAL INVESTIGATION OF TOUGHENING OF BMC WITH WASTE VULCANIZATE POWDER

Waste vulcanizate powder (RP) was used as an active filler to modify bulk molding compounds (BMC) based on unsaturated polyester. Effects of various factors such as formulation, preparation technologies on toughening results were systematically studied, and a preliminary discussion on toughening mechanism of RP was also made. Results show that the toughening effectiveness is related to the process of pretreatment, amount of stuff, particle size and type of RP used. When monomer/RP1=50/50, particle size=0.28 mm, and amount of stuff=20 phr, impact strength of BMC increases from 5.2 without RP to 11.4 kJ/m 2, molding shrinkage decreases from 0.5% to 0.1%, whereas other mechanical properties basically remain unchanged. Analyses of TEM and electronic probe prove the formation of a gradient interpenetrating polymer network (IPN) in the vicinity of phase boundaries between RP and the matrix of BMC. The IPN strengthens combination of interfaces of the two phases, enhancing the impact strength of BMC.