纤维素氨基甲酸酯溶液制备工艺研究

研究纤维素氨基甲酸酯(CC)溶液的制备工艺及其稳定性。结果表明:在-5~5℃条件下,用聚合度为350~632的纤维素浆粕合成含氮量为2.34%~3.56%的CC能很好地溶解在质量浓度为2.25~3.0 mol/L的氢氧化钠溶液中,形成淡黄色透明溶液。该溶液经过渗透处理,不仅实现了纺丝液中CC与NaOH质量比≥1的要求,且溶液的黏性、稳定性都有所提高,可直接用于纺丝。通过研究发现,尿素、氯化铝及氯化锌在一定范围内对CC有助溶作用。

Studies on preparation of cellulose carbamate solution

The preparation process and stability of cellulose carbamate solution—a new spinning cellulose were studied.The results showed that the cellulose carbamate with content of N in the range of 2.34%-3.56% synthesized from cellulose pulp with polymerization degree ranging from 350 to 632 can be well dissolved in sodium hydroxide solution with the concentration 2.25 mol/L to 3.0 mol/L at-5-5℃,forming a cellulose carbamate solution with straw yellow.Through osmotic treatment,the solution can be directly used for spinning,for it lives up to the requirement that the weight ratio of cellulose carbamate to sodium hydroxide should be≥1,and has improved viscosity and stability.In addition,researches reveal that the urea、AlCl3 and ZnCl2facilitate the dissolving of cellulose carbamate.