低气味/低VOC含量绿色环保ABS树脂制备

Preparation of Ecologically Friendly ABS Resin with Low Odor/Low VOC

针对本体丙烯腈丁二烯苯乙烯共聚物(ABS)产品气味大、残留单体含量高的问题,采用超临界萃取工艺和使用新型链转移剂对本体ABS树脂的制备工艺进行了优化。考察了十二烷基硫醇、α甲基苯乙烯线性二聚体、3-巯基丙酸甲酯3种链转移剂种类对产品气味的影响,发现α甲基苯乙烯线性二聚体制备得到的ABS中气味最小,且其用量为十二烷基硫醇的3倍时制备得到的产品中总挥发性有机化合物(TVOC)含量最低;通过正交试验,对影响超临界萃取工艺的4个因素(挤出温度、停留时间、真空度、萃取剂用量)进行优选,最优试验条件为:挤出温度为250℃,停留时间为1min,真空度为0.99,萃取剂CO2用量为ABS树脂产量的1.5%。

The ABS resin with a low content of volatile organic compounds (VOC) was prepared by a supercritical extraction process and its preparation process was investigated. The effects of three types of chain transfer agents including dodecyl mercaptan,α-methylstyrene linear dimer and Methyl 3-mercaptopropionate on the total VOC content were also investigated. The results indicated that the ABS resin prepared with α-methylstyrene linear dimer had the lowest TVOC content, and the optimum amount of this linear dimer used for ABS resin is equal to 3.5 times of the amount of dodecyl mercaptan. A four-factor orthogonal design was conducted with extrusion temperature, residence time, vacuum degree, and the optimum amount of extracting agent, and the optimum process conditions was determined as a extrusion temperature of 250 ℃, a residence time of 1 min, a vacuum degree of 0.99, and the amount of extracting agent CO2 of 1.5 wt% corresponding to the yield of ABS resin.