论文部分内容阅读
采用双酚A(BPA)和十二烷基酚(DDP)对双酚A型小分子量液体环氧树脂E-51进行扩链,然后用二乙醇胺(DEA)、N,N二甲基氨基丙胺(DMAPA)对其进行化学改性,再用乳酸中和并乳化在水中,制备了自乳化型阳离子环氧乳液。讨论了扩链反应时间,DDP、DEA和DMAPA用量以及中和度对自乳化环氧乳液外观及稳定性的影响,获得了较佳的反应条件:m(E-51)∶m(BPA)∶m(DDP)=50∶13.9∶10,n(DDP)∶n(DEA)∶n(DMAPA)=30∶40∶15,中和度40%,反应时间60min,反应温度150℃。以此条件下制备的自乳化型阳离子环氧乳液制备阴极电泳涂料,当电泳电压为125V、电泳温度30℃、电泳时间2min时,可制备出综合性能优良的阴极电泳涂料漆膜。
Bisphenol A (BPA) and dodecylphenol (DDP) were used to extend bisphenol A low molecular weight liquid epoxy resin E-51, and then were oxidized with diethanolamine (DEA), N, N dimethylaminopropylamine (DMAPA) were chemically modified, then neutralized with lactic acid and emulsified in water to prepare a self-emulsifying cationic epoxy emulsion. The effects of chain extension reaction time, dosage of DDP, DEA and DMAPA and degree of neutralization on the appearance and stability of self-emulsifying epoxy emulsion were discussed. The optimum reaction conditions were obtained: m (BPA): (DDP) = 50:13. 9:10, n (DDP): n (DEA): n (DMAPA) = 30:40:15, degree of neutralization 40%, reaction time 60min, reaction temperature 150 ℃. The cathodic electrophoretic coatings were prepared by self-emulsifying cationic epoxy emulsion prepared under this condition. When the electrophoretic voltage was 125V, the electrophoretic temperature was 30 ℃ and the electrophoretic time was 2min, the cathodic electrophoretic coatings with good comprehensive properties were prepared.