H12MDI has high barriers. Wanhua Chemical is the only company in China.

The relative molecular mass of H12MDI is 262∙35. It is similar to MDI in chemical structure. It replaces the benzene ring with a cyclohexyl six-membered ring and is an alicyclic diisocyanate. Compared with HDI and IPDI, the polymerization reaction speed of H12MDI and hydroxyl compounds to produce polyurethane products is slower. This is because the NCO groups in H12MDI are connected to secondary carbon atoms in the chain structure.

Since H12MDI does not contain aromatic groups in the molecule, it is not easily oxidized to form quinones that are easy to change color. It can be used to prepare non-yellowing polyurethane products. It is suitable for the production of polyurethane materials with excellent light stability, weather resistance and mechanical properties. It is especially suitable for Manufactures polyurethane elastomers, waterborne polyurethanes, fabric coatings and radiation-cured polyurethane acrylic coatings. According to the “2022-2027 China H12MDI Industry Market In-depth Research and Development Prospects Forecast Report released by the Industrial Research Center, H12MDI is Applications in the field of polyurethane elastomers account for more than 70%, and demand in the field of water-based polyurethane coatings accounts for about 15%.

Polyurethane elastomer has good wear resistance, tear resistance, fatigue resistance, elasticity and mechanical strength, and is widely used in automobile tires, machinery, printing, wires and cables, papermaking, steel and other fields. my country is a major producer of polyurethane in the world. In 2021, the output of my country’s polyurethane industry will be about 15 million tons. As an important segmented product of polyurethane, polyurethane elastomer industry is constantly developing in the direction of refinement, functionality, environmental protection, and high performance, which will promote the further development of the H12MDI industry in the future.

The research on H12MDI, especially the development of industrial technology, started late. Currently, there are only three manufacturers in the world: Evonik of Germany, Covestro of Germany, and Wanhua Chemical of China, with production capacities of 20,000 tons, 20,000 tons, and 10,000 tons respectively. The production methods of H12MDI can also be summarized as phosgenation method and non-phosgenation method. The phosgenation method can be divided into liquid phase phosgenation method and gas phase phosgenation method according to the difference in reaction phase. Compared with the liquid phase method, the gas phase reaction has the characteristics of less phosgene consumption, fast reaction speed, good mixing effect, no clogging, and long-term stable operation, and its reaction yield can be as high as more than 98%.

Industry analysts said that H12MDI has outstanding product performance and lower chemical toxicity, which is suitable for the development trend of environmental protection regulations and has High added value and good market application prospects.