Effects of different additives on waterproof and moisture permeable coating

In order to improve the coating properties of polysulfonamide(PSA)/cotton blend fabric,additives such as carboxymethyl cellulose(CMC) and sodium alginate(ALG) were added into waterborne polyurethane.By comparing the coating properties like moisture permeability,rain drop repellency and bending length,the results showed that CMC was superior to ALG.Addition of polyethylene glycol(PEG) into the CMC-containing waterborne polyurethane could significantly improve the moisture permeability and hand feeling of the coated fabric.It was found that under the conditions of coating agent with CMC 0.25% and PEG 10%,moisture permeability of the coated fabric was up to 6 721.5 g/(m2·24 h),and bending length of the fabric was 5.51 cm,with rain drop repellency rating of 5,indicating it had better waterproof,permeability and hand feeling.