Preparation and Performance of Solvent-free Waterproof and Breathable Polyurethane Membrane
The mixture of polyoxyethylene glycol(PEG),polytetrahydrofurandiol(PTMG),1,4-butanediol,ethylene glycol,leveling and wetting additives was used as component A,the prepolymer prepared by polyoxypropylene glycol(PPG),PEG and 4,4′-diphenylmethane diisocyanate(MDI-100)was used as component B,Solvent-free waterproof and moisture-permeable polyurethane(PU)membranes were prepared with component A and B.The effects of leveling and wetting additives on the flatness of the membranes were discussed,and the effects of PEG/PTMG mass ratio in component A on the apparent morphology,thermal stability,mechanical properties and water resistance and moisture permeability were investigated.The results showed that,when the mass fraction of leveling agent was 1%and wetting agent was 0.5%,the PEG/PTMG mass ratio of A component was 7∶3,the tensile strength of the waterproof and breathable PU film was 19.8 MPa,the moisture permeability of the PU film was 14 200 g/(m2·d),the water pressure resistance exceeded 90 kPa,the surface of the membrane was smooth and dense,and the comprehensive performance was strong,which could meet its application requirement in the field of waterproof and moisture permeability.
solvent-free polyurethanewaterproof and breathablepolyether polyurethanewaterproof breathable membrane
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