水性环氧-丙烯酸树脂制备及其涂膜性能

Preparation of Waterborne Epoxy-Acrylic Resin and Its Film Performance

利用化学接枝的方法将环氧树脂接枝到丙烯酸及其酯的共聚物上 ,形成具有一定交联度 ,能分散于水中的自乳化树脂。考察了催化剂用量、聚乙二醇相对分子质量及环氧树脂的相对分子质量和在聚合物中的比例对所形成树脂的交联密度及涂膜致密度的影响。在采用较高量的催化剂 ,分子链较短的聚乙二醇与环氧树脂用量适当时 ,可制得性能优良的树脂 ,其涂膜具有优良的耐碱性与耐盐雾性。

Epoxy resin is grafted chemically onto the acrylic copolymer to form a self-emulsified resin,which is partly crosslinked and able to be dispersed in water.The influences of amount of catalyst, relative molecular weight of polyethylene glycol and epoxy resin,and their ratios in polymer matrix on the crosslinking density of the formed resin and film density were discussed. When using higher amount of catalyst,lower molecular chain polyethylene glycol and proper epoxy amount, an excellent resin,which shows excellent alkali and salt spray resistance,can be prepared.