MDI, namely diphenylmethane diisocyanate, is an organic substance and the main downstream product of aromatic hydrocarbons. Widely used in the production of polyurethane elastomer, synthetic fiber, artificial leather, solvent-free coatings and other polyurethane materials.
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Toluene diisocyanate easily reacts with compounds containing active hydrogen atoms: amine, water, alcohol, acid and alkali, especially with sodium hydroxide and tertiary amine, releasing a lot of heat. The reaction with water to generate carbon dioxide is one of the key reactions in the manufacturing process of polyurethane foam, and moisture should be avoided.
Polyurethane products made of diphenylmethane diisocyanate have been widely used to produce polyurethane synthetic leather, artificial leather coating, polyurethane soft foam, rigid foam and so on, especially for building materials, because they show good chemical stability such as high tear strength, low temperature flexibility and low thermal conductivity.
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