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Methylene diphenyl diisocyanate (MDI) is an aromatic diisocyanate. Three isomers are common, varying by the positions of the isocyanate groups around the rings: 2,2′-MDI, 2,4′-MDI, and 4,4′-MDI. The 4,4′ isomer is most widely used, and is also known as 4,4′-diphenylmethane diisocyanate. [3] This isomer is also known as Pure MDI.
Initially, the listed company only owned the methylene diphenyl diisocyanate (MDI) production line of the former Yantai synthetic leather factory. [4] It was a common practice at that time to list part of the assets instead of the whole conglomerate. The size of the listed company expanded beyond that assets, however.
In the industrial production, MDA is produced by reaction of formaldehyde and aniline in the presence of hydrochloric acid. [3] MDA is a common monomer in the synthesis of polymer materials. These include polyamides, [4] polyimides and polyimines. [5] MDA is also used extensively as a precursor to methylene diphenyl diisocyanate (MDI).
The global market for diisocyanates in the year 2000 was 4.4 million tonnes, of which 61.3% was methylene diphenyl diisocyanate (MDI), 34.1% was toluene diisocyanate (TDI), 3.4% was the total for hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI), and 1.2% was the total for various others. [18]
In terms of production capacity, it is 5th BPA maker and 9th phenol maker in the world. (founded in 1976) Kumho Polychem provides EPDM(ethylene propylene diene monomer) with 4th largest production capacity in the world. (founded in 1985) Kumho Mitsui Chemicals provides MDI(methylene diphenyl diisocyanate). (founded in 1989)
This facility has South Asia's first methylene diphenyl diisocyanate (MDI) splitter for processing crude MDI. BASF has 8 production facilities in India. [76] BASF SE has succeeded in developing a semi-crystalline polyamide that allows light to pass through largely unhindered, known as Ultramid. [77]
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The reaction of (MDI) and polyol takes place at higher temperatures compared with the reaction temperature for the manufacture of PUR. At these elevated temperatures and in the presence of specific catalysts, MDI will first react with itself, producing a stiff, ring molecule, which is a reactive intermediate (a tri-isocyanate isocyanurate compound).