氰乙基变性对淀粉浆料性能的影响

 为了提高淀粉浆料的使用性能,以丙烯腈为醚化剂,通过改变丙烯腈对淀粉的投料比,制备了一系列具有不同取代度的氰乙基醚化淀粉。研究了氰乙基醚化变性方式及变性程度对纤维黏附性能和浆膜性能的影响。实验结果表明:淀粉氰乙基醚化变性能够改善淀粉对棉纤维的黏附性能,提高淀粉浆膜的断裂强度、断裂伸长率和耐屈曲次数,并能降低浆膜的磨耗;随着取代度的增加,氰乙基淀粉对棉纤维的黏附力先增大后减小,当取代度为0.047时,黏附力达到最大值;对涤纶纤维和涤/棉纤维而言,当取代度超过0.017时,黏附力随着取代度的增大而降低。

Effect of cynaoethylation of starch on its sizing behavior

In order to enhance the sizing behavior of starch,a series of cynaoethyl starch with different degree of substitution were prepared by using acrylonitrile as etherifying agent and varying the feed ratio of acrylonitrile to cornstarch for changing the degree of substitution of the starch ether.The influences of the modification method and extent on the behavior of starch film and adhesion to fibers were studied.The experimental results demonstrate that the starch etherification can improve the breaking strength,breaking elongation,flex resistance and wear loss of starch film.As the degree of substitution increases,the adhesion of cynaoethyl starch to cotton fibers initially increases and then decreases.A maximal bonding strength can be achieved when the degree of substitution is 0.047.However,the adhesion of the modified starch to polyester and polyester/ cotton fibers decreases as the degree of substitution increases when the degree of substitution exceeds 0.017.