氧化-叔胺化淀粉的制备及其对羊毛低温性能的影响

Preparation of Oxidized-tertiary Aminated Starch and Its Low-temperature Properties to Wool Fibers

为提高淀粉在羊毛经纱低温上浆中的应用效果,在碱性条件下,制备氧化玉米淀粉(OCS)并与醚化剂(二甲氨基甲酰氯)反应制备氧化-叔胺化淀粉(OTAS),使用扫描电子显微镜(SEM)和X射线能谱仪(EDS)对其进行了表征分析,并考察了这种变性对淀粉溶解度及其低温粘度及粘度热稳定性、粘附性、羊毛经纱上浆等性能的影响。结果表明,OTAS能有效降低淀粉的低温粘度,提高其低温粘度热稳定性,提高其溶解度及其对羊毛纤维的低温粘合性能,提升淀粉膜的溶胀度、溶解率,缩短水溶时间,降低膜脆性,具有更好的低温浆纱性能。随着取代度增加,OTAS的低温粘度、溶解度及其对羊毛纤维的低温粘附性能均逐渐提升,从而为OTAS在羊毛经纱低温上浆中的应用奠定了基础。

In order to improve the application effect of starch in the low-temperature sizing of wool warp yarns,oxidized corn starch(OCS)was prepared under alkaline condition and then reacted with etherifying agent(dimethylcarbamoyl chloride)to prepare oxidized-tertiary aminated starch(OTAS),which was characterized by scanning electron microscopy(SEM)and energy dispersive x-ray spectrometer(EDS),and the influences of this modification on the solubility,low-temperature viscosity and viscosity stability,low-temperature adhesion,sizingof wool warp,etc.,were estimated.The results showed that the oxidation-tertiary amination of starch could effectively reduce the low-temperature viscosity of starch,improve its solubility,viscosity stability and low-temperature adhesion to wool fibers,enhance the swelling power and solubility of its film,shorten the time required for the break of the film in water,and reduce the film brittleness.With the increase in the degree of substitution,the low-temperature viscosity,solubility,and low-temperature adhesion of OTAS to wool fibers were gradually improved.This lays a foundation for the application of OTAS in the low temperature sizing of wool warp yarns.