Abstract: In this paper, the acidolysis carboxymethyl composite modified starch was prepared by acidolysis and carboxymethylation reaction of cassava starch. Its structure was characterized by IR, the size property and sizing film property were tested and the practical sizing and weaving effect were studied through sizing contrast test on polyester/cotton high-count-density fabric. The test results show that the sizing agent has high concentration and low but thermal-stable viscosity, and the size film performance is better than conventional modified starch. It has good adhesion to polyester/cotton fabric, good sizing abrasion resistance and hairiness coverage as well as high loom efficiency and quality rate.

Key words: acidolysis carboxymethyl composite modified starch; high-count-density fabric; sizing quality;loom efficiency