异淀粉酶水解豌豆淀粉及其在玻纤浸润中的应用

Isoamylase-Hydrolyzed Pea Starch and Its Potential Application in Glass Fibre Sizing

该文研究了豌豆淀粉的异淀粉酶水解过程,并将其水解产物用作玻纤浸润剂。结果表明,异淀粉酶对豌豆淀粉的水解采用点蚀和劈裂两种方式进行。水解对淀粉颗粒聚集行为有影响,具体表现为粒度、X射线衍射强度和黏度的波动。当酶解温度为50℃,酶解时间30 h,所得酶解淀粉液表面张力可降至40 mN/m,与玻纤临界表面张力30 mN/m接近。同时,酶解破坏使更多的淀粉羟基被暴露出来,因此,水解产物可以在玻纤表面轻易铺展,并与玻纤表面牢固结合。直接以水解淀粉悬浊液为浸润剂,玻纤拉丝过程可顺利进行,且能在玻纤表面形成均匀的保护膜,所得68 tex玻纤断裂强力平均达到25.0 N。

The present work studied the hydrolysis of pea starch by isoamylase, and the hydrolyzed product was applied in glass fibre sizing, The results indicated that the isoamylase hydrolyzed pea starch by pitting and splitting. The aggregation behavior of the starch particles was affected by hydrolysis, which was manifested in the fluctuation of particle size, XRD intensity and viscosity. When the hydrolysis temperature was 50 ℃, the surface tension of the hydrolyzed starch suspension could be reduced to 40 mN/m, which is close to the critical surface tension of glass fibre （ 30 mN/m）. By breaking the starch granules with isoamylase, more hydroxyl groups of the starch molecules would be exposed. Therefore, the hydrolyzed product could easily spread over the surface of glass fibre, and conglutinate to glass surface firmly. Using the hydrolyzed product as sizing agent, the glass fibre - forming process was accomplished smoothly. Uniform protective film formed on the surface of glass fibre. The average breaking force of the 68 tex glass fibre was 25.0 N.