Abstract:

In order to improve the sizing adhesion force for polyester/cotton blended yarn and mechanical properties of the sizing film, the catalytic acidolysis preparation of starch-g-poly(methyl acrylate) catalyzed by horseradish peroxidase (HRP) in the presence of hydrogen peroxide (H2O2) and acetylacetone (ACAC) was studied. The grafted starch was characterized by FT-IR. SEM and XRD, and the rheological characteristics were analyzed. The results show that under the catalytic action of HRP, methyl acrylate and starch which is not gelatinized and acidolyzed os subjected to grafting copolymerization reaction, which has no effect on the crystallinity of acidolysis starch; the graft modification increased the viscosity and viscoelasticity of the acidolysis starch, and the grafted starch slurry exhibits a more elastic fluid behavior. Compared woth the acidolysis starch, the adhesion force of the grafted starch slurry for the polyester/cotton blended yarn is obviously improved. The Elongation at break and breaking strength of the grafted starch film increased, and the film mechanical properties were improved.

Key words: starch, horseradish peroxidase, methyl acrylate, rheological property, adhesion force, size film performance