小橡胶粒子对浓缩天然胶乳胶体性能的影响

Effect of small rubber particles on colloidal properties of concentrated natural rubber latex

基于鲜天然胶乳制备浓缩胶乳的过程中胶清未得到有效利用,同时小橡胶粒子有着自己的独特的性能。本文通过膏化法从胶清中获得小橡胶粒子,将小橡胶粒子胶乳(SRPL)与浓缩胶乳以不同质量比进行混合,对贮存过程中混合胶乳的胶体性能进行研究。结果表明,小橡胶粒子的相对分子质量较大,小橡胶粒子在浓缩胶乳中含量越多,混合胶乳的相对分子质量随之增大;随着小粒子含量的增加,浓缩胶乳样的平均粒径不断减少;随着贮存时间的增加,各胶乳样品中橡胶粒子的平均粒径变化不大;SRPL加入到浓缩胶乳中,对浓缩胶乳的黏度、机械稳定度、热稳定度都有影响,随着小橡胶粒子用量的增加,胶乳的黏度随之升高,胶乳的机械稳定度和热稳定性先下降,随后上升并趋于稳定。

In the process of preparing concentrated latex based on fresh natural latex,the latex has not been effectively utilized.At the same time,small rubber particles have their own unique properties.Small rubber particles(SRP)were obtained from the skim rubber latex by the paste method,and SRPLwas mixed with concentrated latex in different mass ratios to study the colloidal properties of the mixed latex during storage.The results show that the molecular weight of SRP is relatively larger.The molecular weight of the mixed later increases with the SRP content in the concentrared latex.As the content of small particles increases,the average particle size of the concentrated latex samples continues to decrease.With the storage time increases,the average particle size of the rubber particles in each latex sample does not change significantly.The addition of SRPL to the concentrated latex has an impact on the viscosity,mechanical stability,and thermal stability of the concentrated latex.With the increase of small rubber particles,the viscosity of the latex increases,the mechanical stability and thermal stability of the latex first decrease,then increase and stabilize.