Sulfonyl isocyanate composition with improved stability and preparation method thereof

The invention relates to a sulfonyl isocyanate composition with improved stability and a preparation method of the sulfonyl isocyanate composition. The sulfonyl isocyanate composition comprises 10-8000 ppm of an isomer component and/or 0.05-5% of a sulfonamide component. The sulfonyl isocyanate composition has improved stability, after the sulfonyl isocyanate composition is stored at 50 DEG C for 6 months, the change of the mass percentage content of the isocyanate monomer compared with an initial value is less than or equal to 2%, the problems that the product purity is reduced and the color number is unstable in the storage process are solved, and a stabilizer does not need to be additionally added. 本发明涉及一种改善稳定性的磺酰基异氰酸酯组合物及其制备方法，所述磺酰基异氰酸酯组合物包含10-8000ppm的异构体组分和/或0.05-5％的磺酰胺组分。本发明的磺酰基异氰酸酯组合物具有改善的稳定性，在50℃储存6个月后，异氰酸酯单体的质量百分含量与初始值相比的变化≤2％，解决了储存过程中产品纯度下降和色号不稳定的问题，且无需额外加入稳定剂。