摘要： 双组分水性环氧涂料具有触变性和抗流挂性不易调节的问题。采用聚氨酯缔合型增稠剂和膨润土复配，并选用乳液型胺固化剂取代常用的水溶性胺固化剂的方式，制备了一款具有高触变、高抗流挂和优异综合性能的双组分水性环氧涂料。研究了增稠剂和流变助剂的种类及用量、胺固化剂的类型对双组分水性环氧涂料的触变性、抗流挂性及其他应用性能的影响规律，结果表明： 6870乳液型胺固化剂与 299增稠剂和 LT膨润土之间存在相互促进作用，当 299增稠剂用量为 0. 5%、 LT膨润土用量为 0. 3%时，搭配 6870乳液型胺固化剂可制得触变指数为 4. 5、抗流挂极限膜厚为 475 μm、综合性能优异的双组分水性环氧涂料。
关键词:
双组分水性环氧涂料,
施工性,
增稠剂,
流变助剂,
乳液型胺固化剂
Abstract: Two-component waterborne epoxy coatings have the problems of difficult adjustment of thixotropy and anti-sagging resistance. In this paper，a two-component waterborne epoxy coatings with high thixotropy，high anti-sagging and excellent comprehensive properties was prepared by the compounding of polyurethane association thickener and bentonite，and the selecting emulsion-type amine curing agent to replace the commonly used water-soluble amine curing agent. The effects of the type and amount of thickeners and rheological additives，and the type of amine curing agent on the thixotropy，anti-sagging and other application properties of two-component waterborne epoxy coatings were investigated. The results show thatthere was a mutual promotion effect between the 6870 emulsion-type amine curing agent，299 thickener and LT bentonite. When the dosage of 299 thickener was 0. 5% and the dosage of LT bentonite was 0. 3%，with 6870 emulsion-type amine curing agent，it could produce a thixotropic index of 4. 5，anti-sagging limiting film thickness of 475 μm，and excellent comprehensive performance of two-component waterborne epoxy coatings.
Key words:
two-component waterborne epoxy coatings,
constructability,
thickener,
rheological additive,
emulsion-type amine curing agent
中图分类号:
李永康, 王佳胜, 刘胜普, 等. 高触变高抗流挂双组分水性环氧涂料的制备[J]. 涂料工业, 2024, 54(5): 49-54.
LI Y K, WANG J S, LIU S P, et al. Preparation of Two-component Waterborne Epoxy Coatings with High Thixotropy and High Anti-sagging Resistance[J]. Paint & Coatings Industry, 2024, 54(5): 49-54.