Effect of Post-chain-extender on the Properties of Waterborne Polyurethane
The effects of post-chain-extender of hydrazine hydrate(HyHy),diethylenetriamine(DETA),isophorone diamine(IPDA)and ethylenediamine(EDA)on the emulsion particle size,film tensile properties,water/solvent resistance and physical properties of synthetic leather during the synthesis of WPU were studied.The results showed that different post-chain-extenders had no obvious influence on the particle size of WPU.When the chain extension coefficient was 0.55,the WPU film with HyHy as the post chain extender had the best comprehensive application performance,the 100%Young's modulus was 1.20 MPa,the elongation at break was 922%,the tensile strength was 16.3 MPa,and the water/solvent resistance was the best.Different post chain extension coefficient of HyHy had little effect on the particle size of prepared WPU.When the post chain extension coefficient was 0.50,the comprehensive properties of the film and the physical properties of the prepared synthetic leather were the best,the folding-fastness was 134 000 times,the abrasion resistance was 4 000 times,both adhesion-resistance and color-spreading property were up to level 5.
post chain extenderwaterborne polyurethaneparticle sizetensile propertysynthetic leather
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