有机硅改性多臂型水性聚氨酯的制备及性能研究

Preparation and properties of UV-curable THPDMS modified multiam waterborne polyurethane

以异佛尔酮二异氰酸酯(IPDI)、聚碳酸酯二元醇(PCDL)、端羟基聚醚改性硅油(THPDMS)、二羟甲基丙酸(DMPA)、六亚甲基二异氰酸酯(HDI)三聚体和丙烯酸羟乙酯(HEA)为主要原料,制备了有机硅改性多臂型水性聚氨酯(TWPU-Si)。采用纳米粒度仪、光学接触角仪、电子拉力机等对膜的结构与性能进行了测试。研究了THPDMS用量对TWPU-Si膜的耐水性、力学性能、硬度、水接触角、热稳定性的影响。结果表明,随着有机硅含量增加乳液粒径逐渐增大、分布变宽,胶膜耐水性和热稳定性增强。拉伸强度先减小再增大后降低。

The UV-curablewaterborne THPDMS modified multiam waterborner polyurethane was prepared by u-sing isophorone diisocyanate （IPDI）,polycarbonate glycol （PCDL）,terminal hydroxyl polyether-modified sili-cone oil （THPDMS）,2,2-dimethylol propionic acid （DMPA）,heamethylene diisocyanate （HDI）trimer, 2-hydroxyethyl acrylate （HEA）as the main materials.The structure and propertises were characterized by par-ticle size analyzer,optical contact angle measuring instrument and electronic tensile machine.The water resist-ance,mechanical property,hardness,water contact angle,and the thermal resistance of the TWPU-Si coating with different contents of THPDMS were investigated.The results indicated that with the content of THPDMS increase the particle size of the TWPU-Si emulsion increased and the particle size distribution gradually widened. Water resistance and thermal performance of the films were improved.The tensile strength of the films firstly decreased then increased and lastly decreased.