氨基增塑剂对淀粉浆料的增塑作用

Effects of some amino plasticizers on plasticization of starch sizing agents

为满足无PVA浆料配方中对淀粉增塑作用的更高要求,以浆液黏度、黏度热稳定性、黏附性及浆膜性能为评价指标,研究几种氨基化合物对淀粉浆料的增塑作用。所研究的氨基化合物包括苯胺、一乙醇胺、尿素等,通过对比实验筛选出性价比较高的淀粉浆料增塑剂,探索合理的用量。结果表明:使用增塑剂能改善淀粉浆膜脆硬的属性,提高它的断裂伸长率和耐屈曲次数,降低磨耗,但会使淀粉浆膜的断裂强度有所下降;在上述几种增塑剂中,一乙醇胺的作用效果最好,其质量分数推荐为干淀粉质量的6%～9%。

In order to meet the demand of starch plasticization in non-PVA-containing size formulation,the effect of some amino substances used as plasticizers on the plasticization of starch sizing agents was investigated in terms of paste viscosity,viscosity stability,adhesion-to-fibers,and starch film behavior.The plasticizers evaluated included aniline,monoethanolamine,urea,etc.Superior plasticizer with good performance /price ratio was found through control test,and the content was also determined.The experimental results demonstrated that the plasticizers could improve the fragility of starch film because breaking elongation and flex resistance of the film increased and wear loss decreased.However,tensile strength of the film decreased with the increase of plasticizer content.It was recommended that monoethanolamine should be used for plasticizing starch with a content of 6% ～ 9% based on dry weight of starch.