环氧树脂改性水性聚氨酯乳液的制备.pdfVIP

环氧树脂改性水性聚氨酯乳液的制备 朱延安1’2，张心亚1，阎虹1，曹树潮2，陈焕钦1 (1．华南理工大学化工与能源学院，广东广州510641；2．广东嘉宝莉化工有限公司，广东江门529085) 摘要：将环氧树脂作为大分子扩链剂合成了水性聚氨酯分散体．当反应温度在70～75℃时，环氧树 脂中的环氧基开环较少，异氰酸酯NCO基转化率达到100％，预聚体的粘度为1．5Pa·S，所得胶膜物 理机械性能良好，拉伸强度达到10 量在4％～6％之间时，所得分散体的外观好，物理机械性能好，同时储存稳定高．在添加环氧树脂 后，当亲水扩链剂DMPA的用量在8％时，才能得到储存稳定的乳液．当用三乙胺进行中和时，所得 的乳液外观发白，颗粒较粗；用氢氧化钠中和所得的乳液外观半透明，粒径较细；而氨水居于两者 之问． 关键词：聚氨酯；水性；环氧树脂；改性；乳液 文献标志码：A 中图分类号：TN914．3 ofwater-borne Preparation polyurethanedispersion modified resin byepoxy ZHU Yan．anl·2，ZHANG Shu—cha02，CHENHuan—ginl Xin—yal，YANHong，CAO ofChemicaland China of 510640，China；2 (1．School EnergyEngineering，SouthUniversityTechnology，GuangzhOll，Guangdong Chemical 529085，China) Guangdongcarpoly Co．．m，]iat塌raett，Guan#ong water—bome was resin鹪macro Abstract：The polyurethanedispersionsynthesizedbyusingepoxy chainextender．Whenthereaction isbetween70—75℃．1ess reactions molecular temperature open—ring rateofNCO is to100％．The occurbetweenradicalandNC0radical．Conversion epoxy groupup tensile is10MPaandthe is450％．Whenthe reaches1．5Pa·S．the stmn昏h elongation epoxy viscosity 0．27 1．16 the levelisbetween valueisbetweenand mo扩g，andusing 4％一6％，goodappearance， mechanic and areobtained．Afterthe of the 900d performancegoodstability addingepoxyresin，when