极性单体熔融接枝改性聚丙烯的表面亲水性能研究

Study on hydrophilicity of polypropylene surface melt grafted by polar monomers

通过在双螺杆挤出机中熔融接枝改性PP,研究了以1,1-二叔丁基过氧-化3,3,5-三甲基环己烷(LQ-CH335)为引发剂,MAH、AA、MAA、AM和GMA为接枝单体,St为接枝共单体的多单体熔融接枝体系对PP制品表面可涂敷性能的影响,并利用静态水接触角进行表征。研究结果表明,添加极性单体可以有效降低水接触角,例如:当GMA、St和LQ-CH335含量分别为1.0%(质量分数,下同)、1.0%和0.3%时,PP水接触角从108.6°降低到71.2°;同时在市场上的PP保险杠料中添加10%接枝PP,可以降低水接触角大约20°,同时力学性能影响不大。

The influence of MAH,AA,MAA,AM and GMA on hydrophilicity of PP product surface was studied by reaction extrusion process in the twin screw extruder, where 1,1-bis（tert-butyl peroxy）-3,3,5-trimethylcyclohexane （LQ-CH335） as the initiatory and St as the graft co-monomer. The results showed that the contact angle of water on PP product surface decreased from 108.6° to 71.2° , when using GMA 1.0%, St 1. 0% and LQ-CH335 0.3%. The hydrophilicity of PP bumper surface can be obviously improved by blending the bumper with the 10% （by weight）grafted PP, and the contact angle of water can be decreased about 20°, while the mechanical properties remains.