ABS树脂絮凝过程中抗氧剂添加工艺和絮凝液组成对其性能影响

Effect of Antioxidant Addition Process and Flocculating Liquid Composition on Performance of Acrylonitrile Butadiene Styrene During Flocculation

水性抗氧剂是丙烯腈-丁二烯-苯乙烯(ABS)树脂生产工艺中絮凝段必须添加的助剂,起到提高ABS树脂热氧老化性的作用,水性抗氧剂的加入工艺和絮凝工艺均对ABS树脂的性能有重要影响。文章采用乳液接枝聚合技术制备了核壳比60∶40的ABS接枝共聚物胶乳,研究了水性抗氧剂加入温度、絮凝剂成分对ABS接枝共聚物热氧老化性能的影响,采用熔融共混技术制备ABS树脂,探究水性抗氧剂加入温度和絮凝剂组成对ABS树脂力学性能、表观性能的影响。结果表明:水性抗氧剂的加入温度高于60℃时,ABS接枝共聚物的热氧老化性能较好。硫酸配置的絮凝液制备的ABS接枝共聚物氧化诱导期大于硫酸镁絮凝液制备的ABS接枝共聚物。抗氧剂加入温度和絮凝液组成对ABS树脂的力学性能无影响,对其表观性能如白度、黄色指数影响明显。

Waterborne antioxidant is a necessary additive in the flocculation stage of acrylonitrile butadiene styrene(ABS) resin production process,which can improve the thermal oxidative aging of ABS resin.The addition process and flocculation process of waterborne antioxidant have an important influence on the performance of ABS resin.ABS graft copolymer latex with a core-shell ratio of 60:40 was prepared by emulsion graft polymerization.The effects of temperature of waterborne antioxidant and flocculant composition on thermal oxidative aging properties of ABS graft copolymer were studied.ABS resin was prepared using melt blending technology.The effects of temperature of waterborne antioxidant and flocculant composition on mechanical properties and apparent properties of ABS resin were investigated.The results show that the ABS graft copolymer has better thermal oxidative aging properties when the temperature of waterborne antioxidant is higher than 60 ℃.The oxidation induction period of ABS graft copolymer prepared using sulfuric acid flocculant is longer than that prepared using magnesium sulfate flocculant.The addition temperature of antioxidant and the composition of flocculant have no effect on the mechanical properties of ABS resin,but have an obvious effect on its apparent properties such as whiteness and yellow index.