MDI (diphenylmethane diisocyanate) is an important isocyanate used in the synthesis of polyurethane resins. Its molecular structure contains two benzene rings and has a symmetrical molecular structure. The polyurethane elastomer obtained has good mechanical properties. The reactivity of MDI is greater than that of TDI. The relative molecular mass of MDI is greater than that of TDI, the vapor pressure is very low, the volatility is low, and the toxicity to the human body is relatively small. Pure MDI is mainly used in the manufacture of various polyurethane elastomers, mostly used in the production of thermoplastic polyurethane elastomers, spandex, PU leather slurry, shoe adhesives, and also used in the manufacture of microporous elastomer materials (shoe soles, solid tires, self-skinning foam, car bumpers, interior parts, etc.), cast polyurethane elastomers, etc. Compared with pure 4,4'-MDI, MDI products with high 2,4'-MDI content have lower reactivity and melting point. Due to the difference in reactivity between 2,4'-MDI and 4,4'-MDI, MDI-50 provides better flowability for the production of molded products. This product can be widely used in the production of various polyurethane elastomer products, adhesives, coatings, automotive parts, and interior decoration parts. It can also be used as a substitute for TDI in the production of soft polyurethane foam, which can reduce environmental pollution and improve operating conditions.
Polyurethane rigid foam is referred to as polyurethane rigid foam, or PU. It is a mixture of two chemical raw materials (material A and material B), which form a rigid foam through chemical reaction. Material A is organic isocyanate, and material B is polyol (polyether polyol) plus foaming agent, catalyst, flame retardant, etc. Material A and material B are pressurized and heated by the foaming machine, sent to the spray gun mixing room through the insulation pipe for mixing, and sprayed on the surface to be insulated with compressed air to instantly foam to form a rigid foam. It can be widely used in cold storage, food factories, chemical plants, industrial buildings, civil buildings, storage tanks and other spray insulation fields. The product has good fluidity, convenient production and operation, uniform and fine pores, and uniform density distribution. It can be constructed on steel plates, cement surfaces, brick surfaces, wood surfaces and other substrates. It has strong adhesion, excellent dimensional stability and thermal insulation.
Application
Construction
MDI is used in the production of insulation materials, such as rigid foam insulation for buildings and appliances, as well as in coatings and adhesives for construction applications.
Automotive
MDI is used in the production of flexible foam for car seats, as well as in elastomers for automotive parts such as seals, hoses, and bushings.
Furniture
MDI is used in the production of flexible foam for furniture and bedding products, as well as in coatings and adhesives.
Electronics
MDI is used in the production of coatings, adhesives, and sealants for electronic applications.
Packaging
MDI is used in the production of coatings and adhesives for packaging applications.
Coatings
MDI is used in the production of coatings and sealants for industrial and consumer applications.
Polyurea
MDI is also used in the production of polyurea, which is a type of polymer that can be used for coatings, linings, and sealants.
Adhesives
MDI is used in the production of adhesives for industrial and consumer applications.
| Project |
Indicators |
| Surface |
Brown Liquid |
| Viscosity (25ºC) / mPas |
150~250 |
| Isocyanate content (-NCO)/% |
30.5~32.0 |
| Density (25ºC) / (g/cm3) |
1.220~1.250 |
| Acidity /% |
≤0.030 |
| Hydrolysis of c hlorine /% |
≤0.20 |
Diphenylmethane-4,4 '- diisocyanate is packaged in nitrogen sealed galvanized iron drums. Store in a cool, ventilated, and dry warehouse, avoiding direct sunlight. The temperature in the warehouse should be below 15 ºC, preferably below 5 ºC, and products should be used as early as possible. Stay away from sources of fire and heat. Long term storage, the storage temperature should not exceed 20 ºC. Strictly waterproof and moisture-proof, store and transport according to toxic chemical regulations.
Hebei Chijiang Import and Export Co., Ltd. is a professional, agile and international plastics chemical supplier, specialising in the plastics and its products industry for more than 10 years, with the most complete international supply chain of plastics raw materials. We offer high quality raw materials, the most agile information on the plastics chemical market and can match you with the most suitable raw material options. Our experience, flexibility and professionalism have LED us to a large number of customers. We have delivered a wide range of different plastic chemicals safely to more than 30 countries and have customers in all regions of the world.
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