乳化条件对自乳化聚乙烯蜡乳液性能的影响

通过对马来酸酐接枝聚乙烯蜡（PEW-g-MAH）接枝共聚物进行皂化改性制备自乳化聚乙烯蜡，探讨了固含量和乳化条件对自乳化聚乙烯蜡的自乳化性及聚乙烯蜡乳液外观、分散性、稳定性、粒径及其分布的影响。结果表明，固含量是影响自乳化聚乙烯蜡乳化性的主要因素，只有当聚乙烯蜡乳液的固含量大于30 %时，自乳化聚乙烯蜡自乳化后方能得到分散良好、长期稳定且粒径分布均一的聚乙烯蜡乳液；乳化温度、乳化时间及剪切速率等乳化条件对乳液的性能均有影响，但乳化温度对自乳化聚乙烯蜡乳液的性能影响较大，乳化温度过高或者过低均对乳液分散和稳定不利，最佳的乳化温度为130 ℃。

Effect of Emulsifying Conditions on Emulsion Properties of Self-emulsifying Polyethylene Wax

The self emulsifying polyethylene wax was prepared by saponifing polyethylene wax grafted with maleic anhydride (PEW-g-MAH), and the effects of solid content and emulsifying conditions on the self emulsifying capability of self emulsifying polyethylene wax and the appearance, dispersion, stability and particle size of the resulting polyethylene wax emulsion were investigated. The results indicated that the solid content of polyethylene wax emulsion is the main influence factor for the emulsifying capability of self emulsifying polyethylene wax. Only when the solid content is higher than 30 %, the polyethylene wax emulsion could achieve a excellent dispersion, long term stability and uniform particle size. The emulsion conditions like temperature, time and stirring rate also presented some influences, and however the effect of emulsion temperature on the emulsion properties of self emulsifying polyethylene wax was more significant. The overhigh or overlow emulsion temperature was disadvantageous to the dispersion and stability of polyethylene wax emulsion. The optimum emulsion temperature for the self emulsifying polyethylene wax was determined as 130 ℃ when prepared by saponifing PEW g MAH.