English name: toluene-2,4-diisocyanate; 2,4-Toluene diisocyanate.
Alias: 2,4-toluene diisocyanate; 2，4-TDI .
Molecular formula: c9h6n2o2; Acetonitrile.
Packing: 500ML grooved glass bottle, iron-capped glass bottle, plastic bottle or ordinary wooden box outside metal barrel (can).
Main uses: used in organic synthesis, production of foam plastics, coatings and as chemical reagents.
Chinese name of MDI: diphenylmethane diisocyanate
constitutional formula
Chinese name 4,4'-diphenylmethane diisocyanate; Methylene bis (4- phenyl isocyanate); Diphenylmethane-4,4'-diisocyanate
English name 4,4'-diphenylmethane diisocyanate
The picture of the structure or molecular formula is black. Click below to see the relative molecular weight or atomic weight of structural formula 250.26.
Density 1. 19(50℃)
Melting point (℃) 36 ~ 39
Boiling point (℃) 190(667 Pa)
Flash point (℃)202
Toxic LD50 (mg/kg)
This product is toxic and will irritate eyes and mucous membranes. The allowable concentration in the air is 0.02E-6.
Character; Role; letter
White or yellowish solid.
Dissolution situation
Soluble in benzene, toluene, chlorobenzene, nitrobenzene, acetone, ether, ethyl acetate, dioxane, etc.
use
The main products of this product are widely used in polyurethane coatings, in addition, they are also used in waterproof materials, sealing materials, ceramic materials and so on. Polyurethane foam made of this product is used as warm (cold), building materials, parts of vehicles and ships; The refined products can be made into automobile bumper, bumper, synthetic leather, non-plastic polyurethane, polyurethane elastic fiber, non-plastic elastic fiber, woven film, adhesive and so on.
Preparation or source
Using aniline as raw material, it reacts with formaldehyde, condenses in acidic solution, neutralizes with alkali, then distills to obtain diaminodiphenylmethane, then reacts with carbonyl chloride to obtain it, and then rectifies and refines it.
other
This product contains isocyanate groups (-N=C=O), which react with hydroxyl groups in the paint or resin to cure in the process of synthesizing resin or paint.
CASNo.: 10 1-68-8
MDI is the general name of 4,4' diphenylmethane diisocyanate (pure MDI), the mixture of pure MDI and polyphenyl polymethylene polyisocyanate (polymeric MDI) and the modified products of pure MDI and polymeric MDI. It is the most important raw material for producing polyurethane, and a small amount of MDI is used in other aspects besides polyurethane. Polyurethane has both the elasticity of rubber and the strength and excellent processability of plastic, especially in heat insulation, sound insulation, wear resistance, oil resistance and elasticity. It is the sixth largest plastic after polyethylene, polyvinyl chloride, polypropylene, polystyrene and ABS (now it has surpassed ABS to become the fifth largest plastic), and is widely used in national defense, aerospace, light industry, chemical industry, petroleum, textile, transportation and other fields.
MDI and TDI are substitutes for each other, and they are both raw materials for producing polyurethane. At present, the price of MDI is slightly lower and its toxicity is lower than that of TDI, but the density of foam is higher than that of TDI system, and the polyurethane products formed by MDI have relatively good formability.
Chemical name: diphenylmethane diisocyanate
Product classification: pure MDI, polymeric MDI, liquefied MDI, modified MDI, etc.
Physical properties:
Pure MDI: white to yellowish crystal at room temperature, storage temperature below 5℃, shelf life of three months, and packaging is generally 250 kg nitrogen-filled iron drum (shelf life of nitrogen-filled tank car is 10 day).
Polymerized MDI: brown transparent liquid, stored at room temperature, with a shelf life of two years. Generally, the package is a 250kg iron drum filled with nitrogen.
Existing technology: At present, the popular MDI production methods in the world basically use aniline as raw material, which is reduced by phosgene method to form crude MDI, and then separated into pure MDI and polymeric MDI by fractionation device.
Latest technology: Due to the great harm of phosgene, many factories are actively developing new synthetic processes to replace phosgene production, such as dimethyl carbonate method. But at present, these methods are only successful in small-scale workshops and cannot be applied to large-scale production at all.
Major suppliers:
European and American enterprises: BASF, Bayer, Huntsman, Dow, Asuncion.
Japanese and Korean enterprises: Japan Polyurethane, Mitsui Products and Kumho Mitsui.
Domestic enterprise: yantai wanhua.
Application field:
Pure MDI: slurry, sole stock solution, spandex, TPU, polyurea spraying, etc.
Polymerized MDI: the field of hard foam and shell
MDI sales model:
Pure MDI: middlemen (few) and downstream factories.
Polymerization MDI: middlemen (miscellaneous but many), rigid foam compound factory, downstream factory.
MDI customer development:
Pure MDI: slurry, sole material, spandex and TPU.
Polymerized MDI:
Intermediary:
Composite material factory:
Downstream of hard foam: refrigerator freezer factory, container, refrigerated truck, solar water heater and electric water heater, disinfection cabinet, imitation wood furniture, PU board, etc.
Case: adhesives, sealants, coatings, etc.
Polyurethane is mainly used for:
Aviation, railways, architecture, sports and other aspects; Used for surface treatment of wooden furniture and metal; Used for heat preservation and cold preservation of storage tanks, pipelines, cold storage, beer, fermentation tanks and fresh-keeping barrels, heat preservation and waterproof of buildings, and can also be used for prefabricated polyurethane plates; It can be used to make plastic products, wear-resistant synthetic rubber products, synthetic fibers, hard and soft foamed plastic products, adhesives and coatings. Used for surface coating of all kinds of wood, chemical equipment, telecommunication equipment and instruments, and various means of transportation.
Polyurethane resin, as a high strength, tear resistance and wear resistance polymer material, is widely used in daily life, industrial and agricultural production, medicine and other fields.
Polyurethane elastomer is used as rollers, conveyor belts, hoses, automobile parts, soles, synthetic leather, wires and cables, medical artificial organs, etc. Soft foam is used for cushions of vehicles, bedrooms and clothes, hard foam is used for heat insulation, sound absorption, packaging, insulation and low foaming synthetic wood, and coatings are used for high-end vehicles, furniture, wood and metal protection, seepage prevention materials for pools, dams and buildings, and fabric coatings. The adhesive has good adhesion to metal, glass, ceramics, leather and fiber. In addition, polyurethane can also be made into emulsion, magnetic materials and so on.
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