环氧树脂涂料的水溶性改性

利用丙烯酸环氧树脂的接枝共聚反应制备了环氧-丙烯酸自乳化自交联水性防腐乳液。研究了反应温度、反应时间、环氧树脂相对分子质量、合成树脂的酸值、引发剂浓度、溶剂、中和剂等对合成树脂水乳液稳定性及单体转化率的影响。实验结果表明,合成环氧-丙烯酸树脂选用的共溶剂是质量比为2∶3的乙二醇单丁醚与正丁醇,用相对分子质量大于2 900的环氧树脂,合成树脂的酸值80 mg(KOH)/g(固体)以上,过氧化苯甲酰用量为接枝单体量的6%,在120℃反应5 h。用N,N-二甲氨基乙醇和水混合液中和,中和度为70%~80%,pH值为7.5~8.5,制得水分散乳液。在该条件下所制得的乳液的固含量为20%~40%,并且乳液的储存、稀释、机械和冻融等稳定性好。

The Water-Solubility Modification of the Epoxy Resin Coating

Epoxy-acrylic emulsion was synthesized from epoxy resin and acrylic by graft-polymerization,which is self-emulsified and self-crosslink water-borne anticorrosive emulsion.The influences of temperature,reaction time,molecular weight of epoxy resin,acid number of synthetic resin,concentration of initiating agent,solvent and neutralization agent on the dispersal stability of synthetic resin and conversion of monomer were investigated.The results showed as follows: the appropriate mass ratio of butylcellosolve to n-butyl alcohol in cosolvent is 2∶3,the molecular weight of epoxy resin is over 2 900,acid number of synthetic resin is 80 mg(KOH)/g,content of benzoperoxide is 6% of the content of monomer,reaction temperature is 120 ℃,and reaction time is 5 hours.The resin was salified with the mixed solvent of N,N-dimethylaminopro-alcohol and water.At this time,neutralized degree is 70%~80% and the pH value is 7.5~8.5.Under optimum reaction condition,solid content of emulsion is 20%~40% and the emulsion is characterized with the excellent properties of deposit,dilution machinery and freeze-thaw.