化工学报 ›› 2018, Vol. 69 ›› Issue (11): 4856-4861.DOI: 10.11949/j.issn.0438-1157.20180481

• 材料化学工程与纳米技术 • 上一篇    下一篇

丙烯酸酯用量对溶胀-嵌段型水性聚氨酯性能的影响

杨东杰1, 施一鸣2, 单国荣1   

  1. 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
  • 收稿日期:2018-05-07 修回日期:2018-07-20 出版日期:2018-11-05 发布日期:2018-11-05
  • 通讯作者: 单国荣

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

YANG Dongjie1, SHI Yiming2, SHAN Guorong1   

  1. 1. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
    2. Hanghua Ink Co., Ltd., Hangzhou 310018, Zhejiang, China
  • Received:2018-05-07 Revised:2018-07-20 Online:2018-11-05 Published:2018-11-05

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13.88 MPa、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。

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

Abstract:

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.

Key words: waterborne polyurethanes, hydroxy-terminated polyacrylate, block polymer, emulsion polymerization

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