不同抗氧剂体系对聚丙烯热氧光老化的稳定作用

Stabilization of PP Against Thermal-and Photo-oxidation in Different Antioxidant Systems

以受阻酚类抗氧剂与受阻胺类光稳定剂作为聚丙烯(PP)的防老化助剂,从而筛选出对PP具有长效抗氧化作用的助剂;利用混合流变仪和万能试验机进行了流变和力学性能测试,研究了抗氧剂与光稳定剂单独及复配使用对PP老化性能的影响。结果表明,单独使用抗氧剂与PP共混,对PP成型加工时抗氧化能力的提升顺序为受阻酚1076>受阻酚3114>受阻酚1330>受阻酚1010;受阻酚1076与受阻胺944复配使用时,PP的长效抗氧化性能最好,热氧光老化72h和144h后断裂伸长率保持率分别为75.9%、52.8%,螺杆转速为1r/min时的剪切黏度值保持率分别为89.9%、74.1%。

To impart a long-term antioxidant capability to polypropylene （PP）,the hindered phenol antioxidants and hindered amine light stabilizers were selected as anti-aging agents to prepared the aging resistant PP.The rheological and mechanical properties of the aging-resistant PP were evaluated,and the effects of antioxidants and light stabilizers on their aging properties were investigated.The results indicated that the hindered phenol antioxidants led to an enhanced antioxidation capability for PP parts in an order of Irganox 1076〉Irganox 3114〉Irganox 1330〉Irganox 1010.A combination of Irganox 1076 and Chimassorb 944 could generate a long-term antioxidant effect on PP,the retention rates for elongation at break of PP were 75.9 % and 52.8 % after thermal oxidative aging for 72 h and 144 h,respectively.The retention rates for shear viscosity were 89.9 % and 74.1 % at the screw rotation rate of 1 r/min.