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

doi:10.11949/j.issn.0438-1157.20180481

Abstract

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

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

CLC Number:

TQ436.5

YANG Dongjie, SHI Yiming, SHAN Guorong. Effect of acrylate amount on properties of swelling-block waterborne polyurethane[J]. CIESC Journal, 2018, 69(11): 4856-4861.

杨东杰, 施一鸣, 单国荣. 丙烯酸酯用量对溶胀-嵌段型水性聚氨酯性能的影响[J]. 化工学报, 2018, 69(11): 4856-4861.

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