摘要
以可再生的蓖麻油、聚酯多元醇、甲苯二异氰酸酯为原料,合成出异氰酸酯基封端蓖麻油改性聚氨酯预聚体;再与γ-氨丙基三乙氧基硅烷(KH 550)反应,制备出硅烷封端蓖麻油改性聚氨酯预聚物。采用红外光谱对预聚体结构进行了定性分析,采用热失重对成膜物进行热性能分析,并测试了成膜物的力学性能。结果表明,异氰酸酯基封端蓖麻油改性聚氨酯与KH 550的较佳反应温度为70℃,反应时间为4 h;随固化温度的增加,硅烷封端蓖麻油改性聚氨酯胶膜的表干时间缩短,固化温度大于30℃后下降趋势趋于平坦;固化膜能在230℃前保持稳定,其拉伸强度达到11.6 MPa、拉断伸长率为460%,与蓖麻油改性聚氨酯相比分别提高37.8%、22.1%。
The isocyanate endcapped castor oil-modified polyurethane prepolymer was synthesized with renewable castor oil, polyether polyols, and toluene diisocyanate （TDI） as the starting material. The obtained isocyanate capped polyurethane prepolymer was reacted with 3-aminopropyhriethoxysilane to produce siloxane- endcapped castor oil modified polyurethane prepolymer. IR was used for the analysis of the structure of materi- als, and TGA was used for the thermal property. The mechanical properties of the film were also tested. Re- suits indicated that the proper temperature of siloxane-endcapped castor oil-modified polyurethane and KH 550 was 70℃, the reaction time was 4 h ; as the curing temperature was increased, the tack-free time of the polyu- rethane film was decreased. When the curing temperature exceeded 30℃, the downtrend tends to be smooth. The film kept stable before 230℃, its tensile strength reached to 11.6 MPa with an elongation of 460%. Com- pared with castor oil-modified prepolymer, its elongation improved by 37.8% and 22. 1%, respectively.
出处
《有机硅材料》
CAS
2013年第3期153-157,共5页
Silicone Material
基金
江西省对外科技合作项目(2010EHA03300)
江西省科学院青年基金项目(kxy2009008)
