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用异佛尔酮二异氰酸酯与仲羟基封端的聚硅氧烷(PMTS)反应在PMTS分子链端引入异氰酸酯基团,然后将其与聚丙二醇反应制得聚硅氧烷改性聚氨酯(PSU)预聚体,最后加入丙烯酸酯单体(AC)通过乳液聚合制备了非偶联型聚硅氧烷聚丙烯酸酯改性聚氨酯(PSU-AC)三元复合乳液.在PSU与AC聚合时加入丙烯酸羟乙酯(HEA)作为偶联剂在二者之间建立化学键联,制备了偶联型三元复合乳液(PSU-H-AC).对两系列三元复合乳液及其胶膜性能的表征结果显示,偶联型PSU-H-AC乳液的乳胶粒尺寸较小,粒径分布更均一.偶联型三元乳液的表面张力明显高于非偶联型乳液.偶联剂HEA的使用对抑制憎水性PAC与亲水性PU之间的相分离有显著作用,使其形成相结构均一的乳胶膜,耐水性有明显提高.PMTS的使用也可提高乳胶膜的憎水性,但只有当其分子量在2000以下,其用量不低于5.0 wt%时,乳胶膜的耐水性才有明显的提高.
Reacting isophorone diisocyanate with secondary hydroxyl-terminated polysiloxane (PMTS) to introduce isocyanate groups at the PMTS molecular chain end and then reacting it with polypropylene glycol to prepare a polysiloxane modified polyurethane (PSU) pre (AC) was prepared by emulsion polymerization of unconjugated polysiloxane polyacrylate modified polyurethane (PSU-AC) ternary composite emulsion in the PSU and AC polymerization was added acrylic acid Ethyl methacrylate (HEA) as a coupling agent to prepare a coupling ternary composite emulsion (PSU-H-AC) .To characterize the two series of ternary composite emulsions and their film properties The results showed that the latex particle size and the particle size distribution of the conjugated PSU-H-AC emulsion were more uniform.The surface tension of the coupled ternary emulsion was significantly higher than that of the uncoupled emulsion.The coupling agent HEA Hydrophobic PAC and hydrophilic PU phase separation between the significant role in the formation of a uniform phase structure of the latex film, water resistance was significantly improved.PMTS can also improve the hydrophobicity of the hydrophobic membrane, but only when its molecular weight Below 2000, the amount of not less than 5.0 wt%, the water resistance of the latex film was obvious High.