| Popis: |
This paper investigates newly developed synthesized corn starch for the sizing process, as an environmentally-friendly product used for cotton yarn sizing. The development of such newly synthesized natural starch led to a decrease in its molar mass, which made it easier to dissolve and thus easier to penetrate into the yarn structure and subsequently easier to remove from the fabric. Acrylamide (AA) and 2-hydroxyethyl methacrylate (HEMA) were used as monomers in the corn starch grafting process. The same initiators were used for the more efficient formation of grafted monomers on starch: azobisisobutyronitrile (AIBN), potassium persulfate (KPS) and benzoyl peroxide (BP). Research results and FTIR analysis showed that efficient new synthesized corn starch was obtained. The justification of usage of synthesized corn starch was confirmed, especially initiator AIBN in grafting process with 2-hydroxyethyl methacrylate (HEMA) on starch. Analysis of sized yarns found that coarser single as well as plied yarns adsorb or bind more sizing agents in all cases than finer yarns, which can be explained by a larger capacity in volume, looser structure and a smaller number of twist. After sizing process, the mechanical properties of the yarn changes, the breaking force increases, while the breaking elongation partially decreases. The micrographs of the yarns treated with the new starch have a more compact structure with fibres glued together, as well as great parallelism in the direction of the yarn longitudinal axis. Careful choice of the active agent synthesis process, a valid combination and optimal choice of temperature-time regime, can ensure the proper composition of sizing mass and processing method, which will ensure a high quality and uniform yarn sizing process. Based on the extensive conducted analyses, it can be concluded that there is a qualitative and environmental cost-effectiveness using the synthesized potato starch. |
