降凝剂乙烯-醋酸乙烯酯对蜡晶Zeta电位的影响

Effect of Ethylene-Vinyl Acetate Copolymer on the Zeta Potential of Wax Crystals

通过微电泳仪研究了降凝剂乙烯-醋酸乙烯酯(EVA)对蜡晶Zeta电位的影响。结果表明,当降凝剂用量低时,蜡晶的Zeta电位随降凝剂用量的增加而增加;降凝剂用量达到600μg/g时,蜡晶Zeta电位(9.8mV)不随降凝剂用量的变化而变化;在乙烯链节的平均碳原子数为30左右,蜡晶Zeta电位值最大,最大值为10.86mV;降凝剂EVA分子结构中VA链节质量分数在45%时,蜡晶Zeta电位最大,最大值15mV;EVA支化度的增加,蜡晶Zeta电位变小;平均相对分子质量为1.2×104,蜡晶Zeta电位值最大,最大值为11.8mV。

The effects of ethylene-vinyl acetate copolymer（EVA） on the Zeta potential of wax crystals were studied by micro-electrophoretic equipment. The results show that when EVA content is low,the Zeta potential increases with EVA content. When EVA content reaches 600 μg/g,the Zeta potential（9.8 mV） doesn＇t increase with the increasing of EVA content. When the average carbon atom number of ethylene chain reaches 30 or so,the Zeta potential reaches the maximum 10.86 mV. When VA chain content reaches 45%,the Zeta potential reaches the maximum 15.0 mV. When the branch degree of EVA increases,the Zeta potential of wax crystals reduces. When the average molecular weight of EVA reaches 1.2×104,the Zeta potential reaches the maximum 11.8 mV.