精制棉的膨润预处理对硝化棉氮量及分布均匀性的影响

采用北京理工大学研发的硝化棉(NC)含氮量及其分布均匀性测试仪,考察了膨润时间、温度、膨润剂浓度和种类对精制棉膨润效果以及以此为原料制备的NC含氮量及其分布均匀性的影响规律.结果表明:在所研究的范围内,最佳的膨润时间为1.0h,膨润剂的质量分数为8％,膨润效果按照递减顺序排列为:硝酸钾＞尿素＞乙酸钠＞水杨酸钠＞硫脲,间苯二酚;低温条件有利于精制棉的膨润.精制棉的膨润程度越高,NC的氮量分布越均匀.

Effect of Swelling Pretreatment to Cotton Linter on Nitrogen Content and Its Distribution Uniformity of Nitrocellulose

A testing instrument developed by Beijing Institute of Technology has been used to perform the research of this work, which could test the nitrogen content and its distribution uniformity of nitrocellulose (NC). The effects of swelling time and temperature, concentration of swelling agent and the kind of swelling agents on the swelling results of the cotton linter, nitrogen content and its distribution uniformity of NC were investigated. The testing results show that:the optimal swelling time is 1.0 hour and the optimal concentration of swelling agent is 8%; the swelling ability of swelling agents follow a descending trend in a sequence of potassium nitrate, urea, sodium acetate, sodium salicylate and thiourea=hydroxyphenol; and low temperature is benefit to the swelling effect. The higher the swelling degree of the cotton linter, the narrower the nitrogen distribution is.