摘要
对传统双螺杆反应挤出机进行工艺改进,研究了辅助接枝单体和不同半衰期引发剂的分段加入工艺对马来酸酐熔融接枝聚丙烯(PP-g-MAH)的影响。结果表明,辅助接枝单体的提前加入能够有效抑制MAH接枝PP过程中的大分子自由基的断裂;不同半衰期引发剂的分段加入起到良好的协同作用,大幅度提高MAH的接枝效率并有效降低其残留;在30%玻璃纤维增强PP体系(PP/GF30)中,通过该工艺制备的相容剂在1.6%的添加量时与通用PP-g-MAH相容剂3%添加量时的力学性能相近;较低的添加量和MAH残留不仅能够改善最终制品的颜色和气味,还可以提高制品的热稳定性。
The effects of comonomer and initiators with different half-time on the melt grafting process of polypropylene with malic anhydride were investigated in a twin screw reactive extruder. It showed that the pre-addition of comonomer could effectively reduce the crack of macromolecular radicals during the melt grafting process. The addition of peroxide with different half time through different feed throats showed an excellent synergistic effect, which could greatly improve the grafting efficiency of MAH and reduce its residue. In a glass fiber reinforced PP system, a loading of 1.6 ~ of our PP-g-MAH may achieve the same performance using 3 % of traditional PP-g- MAH. Thus the heat resistance was enhanced.
出处
《中国塑料》
CAS
CSCD
北大核心
2016年第3期43-48,共6页
China Plastics
关键词
聚丙烯
马来酸酐
反应挤出
接枝效率
polypropylene
malic anhydride
reactive extrusion
grafting degree