水性抗氧剂组成以及含量对ASA树脂性能的影响

Effect of antioxidant composition and content on performance of ASA resin

采用乳液聚合法制备了核壳比为6/4的ASA核壳接枝共聚物胶乳,系统地研究了水性抗氧剂的组成以及含量对ASA接枝共聚物热氧老化性能的影响,并采用熔融共混法制备ASA树脂,探究了水性抗氧剂的组成以及含量对ASA树脂力学性能、表观性能的影响。结果表明,水性抗氧剂的组成CPL/DLTP为2/3时,其ASA接枝共聚物的热氧老化性能最优;随着水性抗氧剂含量的增加,ASA接枝共聚物的氧化诱导期显著增长;水性抗氧剂的加入量超过1%以后,ASA接枝共聚物的氧化诱导期增长不显著;在230℃空气条件下,添加1%水性抗氧剂的ASA接枝共聚物的氧化诱导期可达73.1 min,其抗热氧老化能力是相同条件下不添加水性抗氧剂ASA接枝共聚物的80倍以上;水性抗氧剂的组成及含量对ASA树脂的力学性能无明显影响,对其表观性能如白度影响明显。

In this study,a core‐shell structured ASA grafted copolymer latex with a core‐shell ratio of 6/4 was prepared through two‐stage emulsion polymerization,and the effects of the composition and content of aqueous antioxidants on the thermo‐oxidative aging,mechanical,and apparent performance of the ASA grafted copolymers were systematically investigated.The results indicated that the ASA grafted copolymer exhibited the optimal thermo‐oxidative aging performance at a waterborne antioxidant CPL/DLTP mass ratio of 2/3.The oxidation induction period of the ASA grafted copolymer increased significantly with an increase in the content of water‐based antioxidants;however,the growth of the oxidation induction period seemed not to be significant with the addition of more than 1 wt%of water‐based antioxidants.The oxidation induction period for the ASA grafted copolymer containing 1 wt%water‐based antioxidant reached 73.1 min at 230℃in air,and its resistance to thermo‐oxidative aging was better than that without an antioxidant under the same condition.Its thermo‐oxidative aging ability was more than 80 times that of the ASA grafted copolymer without any aqueous antioxidants under the same condition.There is no obvious effect of the composition and content of waterborne antioxidants on the mechanical properties of the ASA resin but an obvious effect on its apparent properties such as whiteness.