摘要
为开发出一种力学性能优良、耐水性较佳的聚氨酯,以聚醚多元醇、甲苯二异氰酸酯、二羟甲基丁酸和甲基丙烯酸羟乙酯合成双键封端的水性聚氨酯,再与丙烯酸单体、乙烯基三异丙氧基硅烷(A173)、端乙烯基聚二甲基硅氧烷(Vi-PDMS)进行乳液聚合,得到交联型有机硅改性聚氨酯丙烯酸酯乳液。采用红外光谱、吸水率和力学性能测试等进行表征。结果表明:以A173或Vi-PDMS对PUA进行改性,胶膜断裂强度及吸水性能均得到明显改善;A173可显著提高断裂强度,但其断裂伸长率下降剧烈,耐水性能提高有限;Vi-PDMS可显著提高耐水性,但过量会降低其力学性能。以丙烯酸单体的质量为基准,当采用A173、Vi-PDMS分别为2.5%、3%进行复合改性,胶膜断裂强度和断裂伸长率分别可达1.65 MPa、242%,吸水率降至8.32%。
For developing water-based polyurethane with excellent mechanical properties and better water resistance,a vinyl-terminated prepolymer was prepared from polyether polyols,toluene diisocynate,2,2-dimethylolbutanoic acid and 2-hydroethyl methacrylate. These emulsions were used to copolymerize with methyl methacrylate,butyl acrylate and silicon monomers,including vinyltriisopropoxysilane（ A173） and vinyl-terminated polydimethylsiloxane（ Vi-PDMS）, to synthesize the silicon modified polyurethane acrylate emulsion. The chemical structure of the Si-PUA emulsion was characterized by fourier transform infrared spectrum. The water absorption and mechanical property of the Si-PUA film were investigated.The result showed that the increasing dose of A173 in the copolymerization could enhance the strength but reduce the elongation at break of the Si-PUA films. The presence of Vi-PDMS in the synthesis could give rise to better water resistance of the films but result in lower mechanical properties,especially for higher content of Vi-PDMS. When using 2. 5% A173 and 3% Vi-PDMS in the synthesis of Si-PUA,the breaking strength of the resultant film was up to 1. 65 MPa,the elongation at break was 242%,and water absorption was as low as 8. 32%.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2016年第1期75-80,共6页
Journal of Textile Research
关键词
水性聚氨酯
有机硅
丙烯酸酯
交联
耐水性
waterborne polyurethane
organic silicon
acrylic
crosslinking
water resistance
