自乳化型阳离子环氧乳液的制备及应用  

Preparation and application of cationic self-emulsified epoxy emulsion

作　　者：许平[1] 钟萍[2] 任碧野[1] 钱建军 

机构地区：[1]华南理工大学材料科学研究所,广东广州510640 [2]湖南工程学院化学化工学院,湖南湘潭411104 [3]佛山市科富科技有限公司,广东佛山528200

出　　处：《电镀与涂饰》2013年第1期63-66,共4页Electroplating & Finishing

基　　金：湖南省科技计划项目(2011FJ4134)

摘　　要：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。The chain of liquid bisphenol A epoxy resin E-51 with small molecular weight was extended by bisphenol A （BPA） and dodecyl phenol （DDP）, followed by chemical modification by diethanolamine （DEA） and N,N-dimethylaminopropylamine （DMAPA）. The self- emulsified cationic epoxy emulsion was prepared by neutralizing the product obtained above with lactic acid and emulsifying in water. The effects of chain-extending reaction time, dosages of DDP, DEA and DMAPA, and neutralization degree on appearance and stability of self-emulsifying epoxy emulsion were discussed. Good reaction conditions were obtained as follows： m （E-51） ： m （BPA） ： m （DDP） is equal to 50 ： 13.9 ： 10, n （DDP） ： n （DEA） ： n （DMAPA） is equal to 30 ： 40 ： 15, neutralization degree is 40%, reaction time 60 min, and temperature 150 ℃. A cathodic electrophoretic coating was prepared by using the self-emulsified cationic epoxy emulsion obtained under the given conditions, and the cathodic electrophoresis coating film with excellent comprehensive performance can be prepared when electrophoresis voltage is 125 V, temperature 30 ℃, and time 2 rain.

关 键 词：阴极电泳涂料 环氧乳液 自乳化 阳离子 

分 类 号：TQ630.1[化学工程—精细化工]