环氧氯丙烷交联海藻酸钠的制备及性能

The Preparation and Properties of Cross-Linked Sodium Alginate

用环氧氯丙烷和海藻酸钠反应制得交联海藻酸钠,红外图谱、粘度和热稳定性质的改变证实了交联反应的发生.用正交试验法得到优化合成条件:温度 50 ℃,反应时间 3 5 h,环氧氯丙烷用量为绝干海藻酸钠质量的5 0%,pH值为10.通过交联作用,质量分数1%的海藻酸钠溶液粘度从560 mPa·s上升到 680 mPa·s. 以 1 5 ℃/min从 20 ℃升温到 70 ℃,交联产物粘度下降了95 mPa·s,而海藻酸钠下降了280 mPa·s.

The cross-linked sodium alginate was prepared through reaction between epichlorohydrin and sodium alginate. The cross-linked reaction was proved by the product's IR and properties such as viscosity and heat-proof. The conditions for the preparation of cross-linked sodium alginate were optimized through the orthogonal experiment. The optimal experimental conditions were obtained as follow: 60 ℃,3.5 h,the weight ratio of mixed anhydride to absolutely dry sodium alginate of 5.0%,and pH 10.0. After cross-linked, the product’viscosity can be improved from 560 mPa·s to 680 mPa·s; The viscosity dropped about 95 mPa·s and the viscosity of the sodium alginate dropped 280 mPa·s, when 1% aqueous solution of the cross-linked sodium alginate was heated from 20 ℃ to 70 ℃.