Abstract: A polyurethane (PU) coating agent was synthesized from 4 ,4′2 diphenylmethane diisocyanate (as
soft segment) , polytetramethylene ether glycol , polyethylene glycol and self2prepared polyoxyethylenetriol (as
hard segment) with 1 ,42butanediol as chain extender. Several representative properties of the polyurethane ,
such as water vapor permeability , waterproofness , hydrophility , response to environmental temperature , etc.
were studied. The results show that the fabric coated with the PU has water vapor transmission rate achieving
over 3 500 gP(m2·d) , resistance to static hydraulic pressure up to 5 kPa , velocity of being wetted by water
reaching about 11 (°)Pmin , and response to environment temperature ranging from 15 to 24 ℃. Meanwhile ,
the probability of using the PU coating agent to produce intelligent waterproof and breathable fabric was
analyzed.