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采用二氯甲烷索氏抽提法对生产车间同一批次不同熟化期的涂布原纸进行抽提处理,利用红外光谱法和紫外分光光度法分别对抽提液进行了定性/定量分析测定,考察了涂布原纸Cobb值随时间的变化趋势。实验结果表明:纸页的二氯甲烷抽提物即为未反应的AKD;对照Cobb值变化趋势图,验证了紫外分光光度计法可以精确地定量测定涂布原纸中未反应AKD量,约为其添加量的50.7%。
The Soxhlet extraction method was used to extract the same batch of coated base paper with different aging stages in the production workshop. The extraction and extraction of the base material were studied by IR and UV spectrophotometry. Cobb value of coated base paper changes with time. The experimental results show that the methylene chloride extract of the paper is the unreacted AKD, and the change trend of the control Cobb value verifies that the UV spectrophotometer method can accurately measure the amount of unreacted AKD in the coated base paper, which is about The added amount of 50.7%.