Blending modification of water-based polyurethane with chitosan derivatives
Polyester 218,polyether 310,IPDI,DMBA were used as the main raw materials to synthesize water-based polyurethane,and a series of mass concentration gradient chitosan(CS)or chitooligosaccharide(COS)were blended with water-based polyurethane(WPU)emulsion,the experimental results showed that because the relative molecular mass of CS was too large,even if the concentration and pH value of CS solu-tion and WPU emulsion were adjusted,the two cannot be blended stably.However,a stable emulsion could be obtained by blending COS with a lower degree of polymerization and WPU.After investigation,it could be known that the critical mass concentration of COS solution was 0.4 mg/mL,and the critical mass ratio of COS to WPU emulsion was 2∶8.The test results showed that the particle size,antibacterial property and water re-sistance of the mixed emulsion were improved after blending and modification,and it had almost no effect on the stability of the emulsion and the thermal stability of the film.
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