蛋白质含量对天然胶乳中橡胶粒子稳定性的影响

Effect of protein content on the stability of rubber particles in natural rubber latex

天然胶乳(NRL)中主要成分为橡胶烃、水和蛋白质、类脂物、无机盐等非胶组分,其中蛋白质对天然胶乳橡胶粒子形态和稳定性有重要影响。对天然胶乳进行离心及酶解处理,得到蛋白质含量不同的脱蛋白胶乳(DPNR)。研究蛋白质对胶乳粒径、zeta电位、胶膜凝胶含量和交联密度的影响。通过对比分析,离心及酶处理后,蛋白质含量降低,平均粒径增大,zeta电位降低,凝胶含量和交联密度均降低。结果表明随着蛋白质含量的降低,橡胶粒子发生团聚,粒子表面保护层完整性和分子网络结构被破坏,分子链间交联点减少,稳定性降低。

The main components of natural rubber latex(NRL)are rubber hydrocarbon,water and protein,lipids,inorganic salts and other non-rubber components,and protein has an important influence on the morphology and stability of natural rubber latex particles.In this paper,the deproteinized natural rubber latex(DPNR)with different protein contents treated by centrifugal and enzyme treatment were obtained.The effect of protein on rubber particle size,Zeta potential,gel content and crosslink density were investigated.Through comparative analysis,after centrifugation and enzyme treatment,the protein content decreased,the average particle size increased,the zeta potential decreased,and the gel content and crosslink density decreased.The results show that as the protein content decreases,the rubber particles agglomerate,the surface protective layer integrity and molecular network structure of the particles are destroyed,the cross-linking points between the molecular chains are reduced and the stability is lowered.