protective colloid

• 保护胶体

protective colloid的用法和样例：

例句

1. VAU emulsion was prepared by using acrolein-acetalized poylvinly alcohol as the protective colloid,emulsion polymerizing vinyl acetate and urea treatmelnting.
   以丙烯酸对聚乙烯醇进行缩醛化处理，然后以此为保护胶体进行醋酸乙烯乳液聚合。