A series of waterborne polyurethane emulsions modified by copolymerization with WACKER IM 22、RHODORSIL OIL 1647 V60、KF-6001 and traditional hydroxy-terminated silicon oil respectively for leather finishing were synthesized, and characterized with GPC, DSC, TEM and TGA and their finishing properties on leathers were measured.The results showed that, the number average relative molecular weight decreased, while the thermal decomposability was similar to the unmodified waterborne polyurethane.The compatibility of soft and hard segments of waterborne polyurethane modified by WACKER IM 22 was good.The freezing resistance and leveling effect were good when the mass ratio of the WACKER IM 22 to polypropylene glycol was 20%.The binding power was good when the leathers were finished by waterborne polyurethane modified by hydroxyl based silicon oil.The hand feeling of said leather style was nice and soft and the water resistance property was increased.
采用聚丙二醇和聚醚硅氧烷二元醇WACKER IM 22为软段,2,4-甲苯二异氰酸酯为硬段合成了有机硅改性水性聚氨酯乳液,通过ATR-IR、GPC、TEM、DSC、TG和WAXD等研究了有机硅改性水性聚氨酯的性能.结果表明,当WACKER IM 22与聚丙二醇的质量比为20%时,有机硅改性水性聚氨酯乳液的耐冻性和流平性提高,数均相对分子质量降低,软、硬段相的相容性提高,热分解性能与未改性水性聚氨酯相似,且无明显的结晶能力.
