NDI (naphthalene diisocyanate) is a new type of polyurethane raw material with high reactivity and excellent heat resistance. Polyurethane made from NDI has excellent strength, hardness and wear resistance, and is suitable for making high-performance polyurethane products such as engineering plastics, special elastomers, etc. However, NDI also has some disadvantages in the production and use process, such as high production cost and easy crystallization.
Performance difference: Polyurethane made from NDI has excellent strength, hardness and wear resistance, and is suitable for making high-performance polyurethane products such as engineering plastics, special elastomers, etc. Compared with TDI and MDI, polyurethane made from NDI has higher heat resistance and better dimensional stability.
Cost: The price of NDI raw materials is relatively high, so the cost of making polyurethane using NDI is also relatively high. However, with the continuous advancement of production technology and the gradual realization of industrialized production, the cost of NDI is expected to gradually decrease.
The three polyurethane raw materials of TDI, MDI and NDI have obvious differences in chemical structure, performance and use. Among them, TDI has good elasticity and softness, and is suitable for making soft foam, elastomers and other products; MDI has high strength, hardness and wear resistance, and is suitable for making hard foam, elastomers and other products; NDI has excellent strength, hardness and wear resistance, and is suitable for making high-performance polyurethane products, such as engineering plastics, special elastomers, etc. When selecting polyurethane raw materials, comprehensive consideration should be given to product performance requirements and cost factors.