摘要
以2,2-二羟甲基丙酸为亲水扩链剂,环氧树脂E-51为改性剂制得了以异氰酸酯基封端、含有羧基的聚氨酯预聚体。然后以季戊四醇三丙烯酸酯(PETA)对预聚体进行部分封端,将封端的预聚体与甲基丙烯酸甲酯(MMA)复合,并分散于水中,得到了含MMA的聚氨酯水分散体。最后,通过原位自由基聚合制得水性环氧树脂-聚丙烯酸酯-聚氨酯杂化乳液(WPUEA)。通过红外光谱、扫描电镜、透射电镜和热失重分析等对乳液及聚合物结构进行了表征并研究了E-51和MMA的用量对聚合物粒子性能的影响。结果表明,MMA和E-51用量分别为聚氨酯预聚体质量的25%~30%和7%~9%时,WPUEA乳液及聚合物的综合性能最佳。
The polyurethane prepolymer terminated by isocyanate and bearing the carboxylic groups was prepared using 2,2- dimethylol propionie acid （DMPA） as hydrophilie chain extender and epoxy resin（E-51 ） as modifier. Then the prepolymer was partly blocked with pentaerythritol triacrylate （PETA）, which was further blended with methyl methacrylate （MMA） and dispersed in water subsequently. Finally, the in situ radical copolymerization was carried out at elevated temperature to produce a hybrid aqueous emulsion of epoxy-polyacrylate-polyurethane （WPUEA）. The emulsion and the polymer were characterized by FTIR, SEM, TEM and TG. The effects of the contents of E-51 and MMA on the emulsion properties were investigated. The results showed that the properties of WPUEA were obviously affected by MMA and E-51 contents, and the comprehensive performance of WPUEA greatly enhanced with MMA content of 25%-30% and E-51 content of 7%-9%.
出处
《热固性树脂》
CSCD
北大核心
2017年第3期35-41,共7页
Thermosetting Resin
