METHOD FOR PREPARING TDI ISOCYANURATE

摘要

The present invention relates to a method for preparing TDI isocyanurate. The raw materials used comprise: TDI, monohydric alcohol, solvent, antioxidant, catalyst and terminator. The performance of the isocyanurate is improved by the modification of monohydric alcohol and the process of adding catalyst and solvent in several stages at an appropriate temperature. During the preparation process, under the condition of simultaneously controlling NCO% and viscosity, the catalyst and the solvent are added in batches, and the solid content in each step is adjusted. The finally obtained TDI isocyanurate has low level of free TDI, high xylene tolerance degree, small color number and high performance stability, which makes the application performance of the product, such as drying property, polishing property, extinction property of paint film, and the isocyanurate have good compatibility with other components.