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以甲苯二异氰酸酯(TDI-80)、聚醚二醇(N220)、三乙胺(TEA)为原料,1,4-丁二醇(BDO)、乙二胺(EDA)为小分子扩链剂,二羟甲基丙酸(DMPA)为亲水扩链剂,环氧树脂E-20为大分子扩链剂,合成了环氧聚氨酯复合乳液,讨论了几种扩链剂对合成的乳液性能的影响。结果表明,乳液的黏度、涂膜的硬度、拉伸强度随BDO、EDA、DMPA和E-20用量的增加而增大;乳液的外观和稳定性随BDO、EDA和E-20用量的增加变差,随DMPA的用量增加而变好;涂膜的吸水率随BDO和E-20用量的增加而减小,随EDA和DMPA用量增加先减小后增大。当BDO的添加量为6%、EDA为0.5%、DMPA为6%、E-20为5%～8%时,所制得的环氧聚氨酯复合乳液性能较好。
Toluene diisocyanate (TDI-80), polyether diol (N220), triethylamine (TEA) as raw materials, 1,4-butanediol (BDO), ethylenediamine (EDA) , Dimethylolpropionic acid (DMPA) as hydrophilic chain extender and epoxy resin E-20 as macromolecular chain extender, epoxy polyurethane composite emulsion was synthesized. The effects of several chain extenders on the properties of the synthesized emulsion Impact. The results showed that the viscosity of the emulsion, hardness and tensile strength of the coating increased with the increase of the amount of BDO, EDA, DMPA and E-20. The appearance and the stability of the emulsion increased with the increase of the amount of BDO, EDA and E-20 Poor, with the DMPA dosage increased and better; water absorption rate with the BDO and E-20 dosage increases and decreases, with the increase in EDA and DMPA dosage first and then increase. When the content of BDO is 6%, EDA is 0.5%, DMPA is 6%, E-20 is 5% ~ 8%, the obtained epoxy polyurethane composite emulsion performance is better.