A series of polyester type waterborne polyurethane(X-WPU)were synthesized using polyester polyols XCP-2000PM and XCP-2000IPS,isophorone diisocyanate(IPDI),dihydroxymethyl propionic acid(DMPA)and other raw materials.The influence of XCP-2000PM and XCP-2000IPS addition on the performance of X-WPU was investigated through the test of emulsion performance,water contact angle and mechanical properties of the films.The results showed that with the increase of the content of XCP-2000IPS in the soft segment,the particle size of the X-WPU emulsion increased while the water contact angle and tensile strength of the film increased first and then decreased.When the content of XCP-2000IPS in the soft segment was 10％,the comprehensive performance of X-WPU3 was best.The average particle size of the emulsion was 95.7 nm and the water absorption of the film in 24 h was 6.8％.The water contact angle of the film was 84.64° and the tensile strength was 20.86 MPa.The water-based ink was prepared by X-WPU3 as the binder with water-based color paste and additives.The properties of the water-based ink as initial dryness,resolubility,water resistance and adhesion were good.The ink film was soaked in water for 24 h without peeling or dissolving and the adhesion fastness reached level 0.
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