用混合乳化剂UE20/PVA制备的水包油型生漆乳液的性能

以漆酚基乳化剂(UE20)和聚乙烯醇(PVA)为混合乳化剂制备了水包油(O/W)型生漆乳液(RLE), 研究了UE20与PVA的质量比、混合乳化剂质量分数(wME)、水与天然生漆(RL)的质量比、温度和贮存时间对RLE性能的影响, 并用透射电镜观察了wME对RLE粒子的大小及形态的影响. 结果表明, RLE的黏度随着PVA的增加而增大; 当wME≤6.7%时, RLE表现出假塑性流体的特征, 其黏度随着wME的增大而增大, 乳液的稳定性增强; 而当wME≥10.0%时, RLE则表现出膨胀型流体的特征, 乳液的黏度较低; 随着温度的升高及水的用量增加, RLE粒子间相互作用减弱, 乳液的稳定性降低. 正交实验结果表明, 影响RLE的黏度及稳定性的顺序为wME＞mH2O∶mRL＞mUE20∶mPVA＞乳化温度. 随着wME的增大, RLE粒子的粒径减小, 其形态也由不规则的形状转变为球形粒子.

Properties of O/W Raw Lacquer Emulsion Prepared via Mixed Emulsifier UE20/PVA

The O/W type raw lacquer emulsion(RLE) was prepared by the mixed emulsifier urushiol-based emulsifier(UE20)/polyvinyl alcohol(PVA). The effects of mass ratio of UE20 to PVA, mixed emulsifier mass fraction(wME), mass ratio of water to raw lacquer, temperature and storage time on the properties of RLE were investigated. The effect of the wME on the diameter of RLE particles were observed via JSM-6380L TEM. The results show that the viscosity of RLE increased with increasing the PVA content. At a low concentration of wME, RLE belonged to pseudoplastic fluids and shear-thinning character was observed. As wMEwas increased to no less than 10.0%, RLE exhibited swell fluids characteristics and the lower viscosity of RLE was observed. Both the interreaction between RLE particles and the stability of RLE decreased with increasing RLE temperature, similar phenomena was observed with increasing the water content. The orthogonal experiment shows that the main influential factor which affected the stability and viscosity of RLE was wME, secondly mass ratio of water to raw lacquer. With increasing wME, erose particles of RLE translated into sphericity and the diameter of RLE particles decreased.