环氧树脂改性水性聚氨酯乳液的制备  

Preparation of water-borne polyurethane dispersion modified by epoxy resin

作　　者：朱延安[1] 张心亚[1] 阎虹[1] 曹树潮 陈焕钦[1] 

机构地区：[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

出　　处：《江苏大学学报（自然科学版）》2008年第2期164-168,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：粤港关键领域重点突破项目招标课题(B10-B2050260)

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10MPa，断裂伸长高达450％．当环氧值在（0．27～1．16）mol／g，添加量在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；而氨水居于两者之间。The water-borne polyurethane dispersion was synthesized by using epoxy resin as macro molecular chain extender. When the reaction temperature is between 70 - 75 ℃, less open-ring reactions occur between epoxy radical and NCO radical. Conversion rate of NCO group is up to 100%. The viscosity reaches 1.5 Pa · s, the tensile strength is 10 MPa and the elongation is 450%. When the epoxy value is between 0.27 and 1.16 mol/g, and the using level is between 4% -6% , good appearance, good mechanic performance and good stability are obtained. After the adding of epoxy resin, when the using level of hydrophilic chain extender DMPA is at 8% , stable dispersion is obtained. When the triethylene amine （TEA） is used as neutralization agent, a whitening and coarse dispersion is obtained; when the sodium hydroxide is used, a semi-transparent and fine dispersion is obtained; the result of using ammonia is in between.

关 键 词：聚氨酯 水性 环氧树脂 改性 乳液 

分 类 号：TN914.3[电子电信—通信与信息系统]