标准摘要
[中文适用范围]： 本文件规定了 2,4- 和 2,6- 异构体混合物中甲苯-2,6-二异氰酸酯的测量方法。 使用两种基于红外光谱的方法可以在广泛的异构体浓度范围内提供准确的结果。 方法 A 适用于含有 5% 至 95% 2,6-异构体的甲苯二异氰酸酯 (TDI) 样品。 方法 B 适用于含有 0% 至 5% 2,6-异构体的 TDI 样品。 两种方法均基于对 810 cm−1 和 782 cm−1（12,3 μm 和 13,8 μm）芳环面外 C−H 变形振动产生的吸收带的定量测量。 [外文原描述]： ISO 15064:2017 specifies methods for the measurement of toluene-2,6-diisocyanate in mixtures of the 2,4- and 2,6-isomers. Two methods based on infrared spectroscopy are used to give accurate results over a broad range of isomer concentrations. Method A is applicable to toluenediisocyanate (TDI) samples containing between 5 % and 95 % of the 2,6-isomer. Method B is applicable to TDI samples containing 0 % to 5 % of the 2,6-isomer. Both methods are based on the quantitative measurement of absorption bands arising from out-of-plane C−H deformation vibrations of the aromatic ring at 810 cm −1 and 782 cm −1 (12,3 μm and 13,8 μm).
英文名称Plastics — Aromatic isocyanates for use in the production of polyurethanes — Determination of the isomer ratio in toluenediisocyanate (TDI)