低软化点松香树脂乳液的制备研究

Preparation of Emulsions from Low-softening-point Rosin Esters

以松香为原料合成低软化点松香树脂，并采用常压逆转法将其制备为乳液。重点研究了乳化剂及助乳荆的种类、用量及加入方式和操作条件等因素对乳液性能的影响，确定了优化的工艺条件。结果表明，乳化剂RH-1与助乳剂ZR-1的最佳质量比为5：1，RH-1最佳用量为松香树脂质量的10％～13．2％；乳化剂和助乳剂的最佳加入方式为先将它们溶于少量水中，再与松香树脂一起加热熔融；乳化温度为100℃，转相前滴水速率为30～40滴／min，搅拌速率为900r／min。所得乳液平均粒径小于250nm，一致性小于0．26，固含量大于55％，常温放置6个月无分层现象。

Emulsions were made from low-softening-point rosin esters by the method of inversion process under atmospheric pressure. The effects of kinds, contents and addition methods of emulsifiers and co-emulsifiers and the processing conditions on the emulsion performance were studied and the reasonable process condition was determined. The results show that the optimal proportion of emulsifier RH-1 to ZR-1 is 5： 1, optimal amount of RH-1 is 10 %-13.2 % of rosin ester mass, the optimal adding method of emulsifiers and co-emulsifiers is to dissolve them in water followed by hot-melting and with rosin ester together, optimal emulsification temperature is 100 ℃, optimal dripping rate before inversion process is 30-40 drops per minute and the stirring speed is 900 r/min. The particle size of the obtained emulsion under this condition is less than 250 nm, the conformance is less than 0.26, solid content is more than 55 % and the stabilization period is more than 6 months.