| 分光光度法测定新型密封胶中异氰酸酯基含量 |
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| 引用本文： | 丁有毅.分光光度法测定新型密封胶中异氰酸酯基含量[J].齐齐哈尔大学学报(自然科学版),2009,25(3). |
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| 作者姓名： | 丁有毅 |
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| 作者单位： | 齐齐哈尔质量技术监督检验检测中心,黑龙江,齐齐哈尔,160006 |
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| 摘 要： | 以N,N-二甲基甲酰胺(DMF)为溶剂,在冰乙酸(HAc)存在下,异氰酸酯基与N,N-对二甲氨基苯甲醛(DMAB)形成有色化合物,该有色化合物的最大吸收波长为440 nm.通过对显色剂用量、体系的酸度、显色时间等影响因素的考察,建立了分光光度法测定新型密封胶中异氰酸酯基含量的定量分析方法.得到的线性回归方程为y = 0.017 6x + 0.173 7,相关系数为R2 = 0.999 3.该方法相对标准偏差小于5%,回收率为98.0%～105.7%,且具有快速、准确等特点.
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| 关 键 词： | 分光光度谱法 密封胶 异氰酸酯基 含量测定 |
Determination of isocyanate content in sealant by spectrophotometry |
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| DING You-yi.Determination of isocyanate content in sealant by spectrophotometry[J].Journal of Qiqihar University(Natural Science Edition),2009,25(3). |
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| Authors: | DING You-yi |
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| Institution: | Qiqihar Quality Supervision and Inspection Center;Heilongjiang Qiqihar 161006;China |
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| Abstract: | In N,N-dimethylformamide(DMF) solution with glacial acetic acid(HAc),the colored compound was formed by reaction of isocyanate and N,N-dimethylamino-benzaldehyde(DMAB).The absorption wavelength of the colored compound is at 440 nm.The analysis method of isocyanate content in sealant was established.The dosages of color development reagent and acidity of the system were investigated.The equation of linear regression is y = 0.0176x+ 0.1737,and the correlation coefficient(R2) is = 0.9993.The relative standard ... |
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| Keywords: | spectrophotometric spectrum new sealant isocyanate-group determination |
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