my country is a major exporter of aggregated MDI, and local companies have a competitive advantage in the global market.

Diphenylmethane diisocyanate, referred to as MDI, is made from isocyanate and polyol as raw materials. As a synthetic material, it is widely used in construction engineering, textiles, plastics and other fields. It can usually be divided into polymerized MDI, modified MDI and pure There are three types of MDI. Polymer MDI refers to a mixture containing a certain proportion of pure MDI and polyphenyl polymethylene polyisocyanate. As an organic synthesis intermediate, it can be used to produce sealing materials, waterproof materials, coatings, etc.

The main preparation methods of polymerized MDI include phosgene method and non-phosgene method. The phosgene method refers to the condensation reaction of raw materials such as formaldehyde and aniline under heating conditions, and finally reacts with phosgene after dissolution to produce polymerized MDI. This method has many by-products and can easily cause environmental pollution; the non-phosgene method It is an emerging preparation method for polymerized MDI. This method has the advantages of low energy consumption, no pollution, low production cost, and high yield of finished products. However, it is still in the laboratory research and development stage and has not yet been applied on a large scale.

According to the “2023-2028 China Polymer MDI Industry Market In-depth Research and Development Prospect Forecast Report released by the Industrial Research Center, polymerization MDI is a chemical commodity and is widely used in many fields. Construction engineering, white goods, adhesives, etc. are its largest demand ends. In the field of construction engineering, polymeric MDI can be used as wall insulation and thermal insulation materials; in the field of white appliances, polymeric MDI can be used to produce refrigerator insulation layers; in the field of adhesives, polymeric MDI adhesives can be used to bond various types of artificial boards. As the development of downstream industries accelerates, the market demand for polymerized MDI will further grow.

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​… According to statistics from the General Administration of Customs of China, my country’s polymeric MDI export volume reached 842,000 tons from January to October 2022, and its import volume reached 237,000 tons. The United States, South Korea, Brazil and Russia are my country’s main exporters of aggregated MDI, of which the United States accounts for nearly 30% of my country’s total exports.

The global polymeric MDI market is mainly concentrated in Europe, the United States and Japan. BASF of Germany, Bayer of Germany, Huntsman of the United States, Dow Chemical of the United States, Mitsui Chemicals of Japan, Tosoh of Japan, etc. are world-renowned polymeric MDI manufacturers. my country’s polymeric MDI industry is highly concentrated, with leading companies occupying a dominant position in the market. Wanhua Chemical and Chlor-Alkali Chemical are the main manufacturers of polymeric MDI in my country. Among them, Wanhua Chemical’s polymeric MDI production capacity ranks first in the global market.

Industry analysts said that polymeric MDI has excellent performance. As an MDI segmented product, it has broad applications in many fields such as construction engineering and white home appliances. Application prospects. After years of experience accumulation, the maturity of my country’s polymeric MDI technology continues to improve, driving further growth in its production capacity and output. In terms of import and export, my country is a major exporter of MDI. As overseas market demand continues to rise, the scale of my country’s exports will continue to expand.