Abstract: In order to explore the possibility of replacing PVA sizes with PR-SU sizes, first, the properties of PR-SU size liquors and size films were compared with those of common modified starches, and then the properties of the liquors and films of PR-SU/PVA blended sizes in five different blending ratios were also tested and compared. The results show that the PR-SU sizes are superior to common modified starches in terms of viscosity thermal stability, liquor adhesiveness, abrasion resistance of size film and similar in term of breaking tenacity; when the blending ratio of PR-SU/PVA blended sizes was changed, there was no clear difference in the adhesiveness to cotton fabric and polyester/cotton fabric and in breaking tenacity and abrasion resistance of the size films. Therefore, PVA sizes could be substituted by PR-SU sizes.

Key words: PR-SU sizes; PVA sizes; properties of size liquor; properties of size film