Abstract: In order to improve coating properties of Polysulfonamide (PSA)/cotton blend fabric, additives such as carboxymethyl cellulose (CMC) or sodium alginate (ALG) was added into waterborne polyurethane. By comparing and analyzing coating properties such as moisture permeability, water resistance and bending length, CMC was generally superior to ALG in effects. The CMC-containing waterborne polyurethane with adding polyethylene glycol (PEG) could significantly improve moisture permeability and handle of coated fabric. It was found that under the condition of coating agent with 0.25% CMC and 10% PEG, moisture permeability of coated fabrics could be up to 6721.5g/m2.24h, water resistance could be at 5 grade and bending length decreased to be 5.51cm.

Key words: waterborne polyurethane , CMC , ALG , waterproof , moisture permeable