丙烯酸酯用量对溶胀-嵌段型水性聚氨酯性能的影响  

Effect of acrylate amount on properties of swelling-block waterborne polyurethane

作　　者：杨东杰 施一鸣[2] 单国荣[1] YANG Dongjie;SHI Yiming;SHAN Guorong(State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China;;Hanghua Ink Co.,Ltd.,Hangzhou 310018,Zhejiang,China)

机构地区：[1]化学工程联合国家重点实验室,浙江大学化学工程与生物工程学院,浙江杭州310027 [2]杭华油墨股份有限公司,浙江杭州310018

出　　处：《化工学报》2018年第11期4856-4861,共6页CIESC Journal

摘　　要：以甲基丙烯酸甲酯(MMA)、丙烯酸正丁酯(BA)为单体,通过巯基乙醇链转移自由基无规共聚合成端羟基聚丙烯酸酯(PA-OH),采用嵌段共聚法将PA-OH与水性聚氨酯(WPU)嵌段,通过预聚体分散法制得聚丙烯酸酯嵌段水性聚氨酯乳液(WPUA),进而通过乳液聚合法制备了一系列以MMA/BA为单体的聚丙烯酸酯嵌段-溶胀水性聚氨酯复合乳液(WPUA-PA),结果表明WPUA-PA中丙烯酸酯量最多可达到WPUA的240%,当丙烯酸酯量为WPUA的120%时WPUA-PA的性能最佳,此时乳液平均粒径为68 nm、粒径分布指数为0.174,胶膜拉伸强度为13.88MPa、断裂伸长率为558.3%、吸水率为4.94%,且具有优异的乳液稳定性。Hydroxyl-terminated polyacrylate(PA-OH)was synthesized by free radical copolymerization of methyl methacrylate(MMA)and n-butyl acrylate(BA)using mercaptoethanol as chain transfer.PA-OH was blocked with waterborne polyurethane(WPU)by block polymerization,and then prepared polyacrylate block waterborne polyurethane emulsion(WPUA)by prepolymer dispersion.A series of polyacrylate swelling-block waterborne polyurethane composite emulsions with MMA/BA as the monomer were prepared by emulsion polymerization.The results showed that the dosage of acrylates in WPUA-PA can reach 240%of WPUA.WPUA-PA has the best performance when the dosage of acrylates is 120%of WPUA.The average emulsion particle size is 68 nm,the particle distribution index is 0.174,the tensile strength of the film is 13.88 MPa,the elongation at break is 558.3%,the water absorption is 4.94%,and the emulsion stability is excellent.

关 键 词：水性聚氨酯 端羟基聚丙烯酸酯 嵌段聚合物 乳液聚合 

分 类 号：TQ436.5[化学工程]