文章摘要
具有亲/疏水链端的混合封端型水性聚氨酯
Mixed End-capped Waterborne Polyurethane With Pro/hydrophobic Chain Ends
投稿时间:2019-05-31  修订日期:2019-08-01
DOI:
中文关键词: 水性聚氨酯  有机硅  耐水性  乳化性  橡塑助剂
英文关键词: waterborne polyurethane  silicone  water resistance  emulsifying  rubber and plastics auxiliaries
基金项目:陕西省科技计划项目(2018JM5164)
作者单位E-mail
牛巧宣 陕西科技大学 2497562173@qq.com 
任龙芳 陕西科技大学 renlf1010@163.com 
摘要点击次数: 31
全文下载次数: 0
中文摘要:
      摘要:以异佛尔酮二异氰酸酯(IPDI)、聚己二酸-1,4-丁二醇酯二醇(PBA2000)、2,2-二羟甲基丙酸(DMPA)合成聚氨酯预聚体(PPU),以部分封端的羟基硅油(MPSi)作为疏水封端剂,以与MPSi同等物质的量的氨基乙酸(Gly)作为亲水封端剂,合成具有亲/疏水链端的混合封端型水性聚氨酯(MEPU),研究了r值〔n(IPDI)∶n(PBA2000)〕、DMPA含量(以IPDI和PBA2000的总质量为基准,下同)、MPSi含量(以PPU的总质量为基准,下同)对MEPU性能的影响。结果表明:当r=3.0,w(DMPA)=5%,w(MPSi)=15%时,MEPU乳液稳定透明,与未改性的水性聚氨酯相比,MEPU胶膜吸水率由16.7%减小到9.5%;水接触角由74.5°增加到92.6°;初始分解温度由264℃提高到293℃;拉伸强度提高了0.11MPa;断裂伸长率提高了5.81%。在不改变乳液稳定性的基础上,MEPU胶膜耐水性和耐热性明显提高。
英文摘要:
      Abstract:Polyurethane prepolymer(PPU) was synthesized with isophorone diisocyanate(IPDI), poly(1,4-butanediol adipate) diol(PBA2000) and 2,2-dimethylol propionic acid(DMPA). Partially blocked hydroxy silicone oil(MPSi) was used as a hydrophobic end-capping agent, and the same molar amount of glycine(Gly) as MPSi was used as a hydrophilic end-capping agent to jointly cap PPU to synthesize a mixed-capped water-based polyurethane(MEPU) with pro-/hydrophobic chain end. The effects of r value〔n(IPDI)∶n(PBA2000)〕, DMPA content(based on the total quality of IPDI and PBA2000), and MPSi content(based on the total mass of the PPU) on MEPU performance were studied. The results showed that when r=3.0, w(DMPA)=5%, w(MPSi)=15%, MEPU emulsion is stable and transparent, compared with un-modified waterborne polyurethane, the water absorption rate of the MEPU decreased from 16.7% to 9.5%; water contact angle increased from 74.5° to 92.6°; initial decomposition temperature increased from 264℃ to 293℃; tensile strength increased 0.11 MPa; elongation at break increased by 5.81%. The water resistance and heat resistance of the film are significantly improved with the basis of not changing the stability of the emulsion.
View Fulltext   查看/发表评论  下载PDF阅读器
关闭