蓖麻油改性封端型水性聚氨酯的制备及性能研究

以二苯基甲烷二异氰酸酯(MDI)、蓖麻油(CO)、聚醚多元醇和二羟甲基丙酸(DMPA)为主要原料,采用预聚体法制备了一系列CO改性、NaHSO3封端的水性聚氨酯(WPU)乳液,探讨了R值、DMPA和CO加入量对WPU乳液和胶膜性能的影响,并采用FT-IR和DSC对其进行了表征.结果表明,CO的加入能使胶膜的热稳定性和拉...

Study on Preparation and Properties of Caster Oil-Based Blocked Waterborne Polyurethane

With diphenylmethanediisocyanate（ MDI）, castor oil（ CO）, polyether polyol and dimethylol propi- onic acid （DMPA） as the main raw materials, a series of castor oil modified NaHSO3 blocked waterborne polyure- thane were prepared by prepolymer method. The influence of R value, DMPA and CO content on WPU and film property was discussed. The properties were characterized by FT-IR and DSC analysis. The results showed that the film thermal stability, tensile strength increased and elongation at break, water absorption decreased by adding CO. The emulsion had better comprehensive performance when R value was 1.4 - 1.7, DMPA content was 3.2% 6.3% ,CO content was 7.5% - 11.2%.