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

摘要： 文章从碱性次氯酸钠溶解粘胶纤维的机理出发，研究了GB/T 2910.4—2009标准中采用稀乙酸溶液中和步骤的重要性，同时分析了不同中和洗涤方式对检测结果准确性的影响。结果表明：次氯酸钠溶液中氢氧化钠会对粘纤造成损伤，不采用稀乙酸溶液冲洗中和，直接用水清洗，粘纤d值对标准有较大偏离，边浸泡边搅拌的中和方式相对来说最为准确和有效。

关键词: 次氯酸钠, 粘纤, 中和, 定量分析, 溶解机理, 氢氧化钠