关键词: 次氯酸钠, 粘纤, 中和, 定量分析, 溶解机理, 氢氧化钠

Abstract: Starting with the mechanism of viscose dissolution with alkaline sodium hypochlorite, this paper studies the importance of neutralization step with diluted acetic acid solution in standard GB/T 2910.4—2009 and meanwhile analyzes the influence of different neutralization washing methods on the accuracy of detection result. The result shows that sodium hydroxide in sodium hypochlorite will damage viscose; d value of viscose deviates from the standard when diluted acetic acid solution is not used for neutralization and water is directly used for washing; the neutralization method with synchronous soaking and stirring is more accurate and effective.

Key words: sodium hypochlorite, viscose, neutralization, quantitative analysis, dissolution mechanism, sodium hydroxide