Methylene Diphenyl Diisocyanate (MDI)
Methylene diphenyl diisocyanate (MDI) is a light yellow solid and is an aromatic diisocyanate. It is soluble in acetone, benzene, kerosene, and nitrobenzene (monomer). Diphenylmethane 4,4′-diisocyanate – is the production of rigid polyurethane.
- Synonyms: Diphenylmethane 4,4′-diisocyanate, 4,4′-Methylenebis(phenyl isocyanate), 4,4′-MDI, Bis(4-isocyanatophenyl)methane, MDI, Methylenediphenylene diisocyanate,
- CAS: 101-68-8
- Assay: 98%
- Appearance (Form): Solid
- Mol. Formula: CH2(C6H4NCO)2
- Mol. Weight: 250.25
- Packing: Drum
- Transport : UN 3335, Class 9, Packing group III
Available on backorder
Description
Methylene Diphenyl Diisocyanate is produced by a 4 steps reaction based on benzene as feedstock. There are 3 isomers of MDI : 2,2-MDI, 2,4-MDI, and 4,4-MDI. The 4,4 isomer is known as pure or monomeric MDI (mMDI).The Polymeric MDI so called Crude MI contains monomeric MDI and products with higher MW (pMDI). MDI is used to produce foam for Insulation, PU elastomer, shoe soles, systems houses, synthetic leather, cold stores, sport floor, foundry, mining. MDI is the least hazardous of the commonly available isocyanates because of its low vapour pression but it is not benign.
MDI is mainly used for bonding rubber to nylon and other adhesives. It is also used in the manufacture of lacquer coatings and in the production of polyurethane resins and spandex fibers.
Formula:C15H10N2O2
InChI:InChI=1S/C15H10N2O2/c18-10-16-14-5-1-12(2-6-14)9-13-3-7-15(8-4-13)17-11-19/h1-8H,9H2
InChI key:InChIKey=UPMLOUAZCHDJJD-UHFFFAOYSA-N
SMILES:O=C=NC1=CC=C(C=C1)CC2=CC=C(N=C=O)C=C2
- Synonyms:
- 1,1′-Methylenebis[4-isocyanatobenzene]
- 4,4′-Bis(isocyanatophenyl)methane
- 4,4′-Diisocyanatodiphenylmethane
- 4,4′-Diphenylmethane diisocyanate
- 4,4′-Diphenylmethane diisocyanate (MDI)
- 4,4′-Mdi
- 4,4′-Methylendiphenyldiisocyanat
- 4,4′-Methylenebis(isocyanatobenzene)
- 4,4′-Methylenebis(phenyl isocyanate)
- 4,4′-Methylenedi(phenyl isocyanate)
- 4,4′-Methylenedi-p-phenylene diisocyanate
- 4,4′-Methylenediphenyl Diisocyanate
- 4,4′-Methylenediphenyldiisocyanate
- 4,4′-Methylenediphenylene isocyanate
- 4,4′-Methylenebis(phenylisocyanate)
- Benzene, 1,1′-methylenebis[4-isocyanto-
- Bis (4-isocyanatophenyl)metan
- Bis(1,4-isocyanatophenyl)methane
- Bis(4-Isocyanatophenyl)Methane
- Bis(4-isocianatofenil)metano
- Bis(4-isocianatofenile)metano
- Bis(Phenylisocyanate), 4,4′-Methylene-
- Bis(isocyanatophenyl)methane
- Bis(p-isocyanatophenyl)methane
- Bis-(4-Isocyanatophenyl)methan
- Bis[1-Isocyanatobenzene], 4,4′-Methylene-
- Ddifenilmetano Diisocianato (MDI)
- Di(4-isocyanatophenyl)methane
- Di-isocyanate de diphénylméthane (MDI)
- Diisocianato De 4,4′-Metilendifenilo
- Diisocianato de difenilmetano (MDI)
- Diisocyanate De 4,4′-Methylenediphenyle
- Diisocyanatodiphenylmethane
- Diphenyl Methanediisocyanate
- Diphenyl methane diisocyanate
- Diphenylmetan diisocyanat (MDI)
- Diphenylmethan-4,4′-Diisocyanat
- Diphenylmethandiisocyant (MDI)
- Diphenylmethane 4,4′-diisocyanate
- Diphenylmethane diisocyanate
- Diphenylmethane diisocyanate (MDI)
- Diphenylmethane-4.4′-diisocyanate
- Diphenylmethyl Diisocyanate
- Diphenylmethylene 4,4′-diisocyanate
- Diphenylmethylene diisocyanate
- Isocyanic acid, diphenylmethylene ester
- Isocyanic acid, methylenedi-p-phenylene ester
- MDI
- Mdi 80
- Methylbiphenyl isocyanat
- Methylbis(4-phenylisocyanate)
- Methyldi-p-phenylene isocyanate
- Methylenbisphenylisocyanat
- Methylene Bisphenyl Isocyanate
- Methylene diisocyanate
- Methylene diphenyl diisocyanate
- Methylene-Diphenylene Di-Isocyanate (M.D.I.)
- Methylenebis(4-isocyanatobenzene)
- Methylenebis(4-phenyl isocyanate)
- Methylenebis(4-phenylene isocyanate)
- Methylenebis(p-phenyl isocyanate)
- Methylenebis(p-phenylene isocyanate)
- Methylenebis(phenyl isocyanate)
- Methylenebis(phenylisocyanate)
- Methylenebis(phenylisocyanate) (MDI)
- Methylenebis-p-phenylene diisocyanate
- Methylenebisphenylene diisocyanate
- Methylenebisphenylene diisocyanate, 4,4′-
- Methylenedi-p-phenylene diisocyanate
- Methylenedi-p-phenylene isocyanate
- Methylenediphenylisocyanate
- Metilene Bisfenil Isocianato
- Méthylène biphényl isocyanate
- Monomeric 4,4′-methylenediphenyl diisocyanate aerosol
- Nsc 9596
- P,P’-Methylenebis(Phenyl Isocyanate)
- Phenylmethane diisocyanate
- YHM
- p,p’-Diphenylmethane diisocyanate
- p,p′-Methylene diphenyl diisocyanate
- p,p′-Methylenediphenyl diisocyanate
4,4′-Methylenebis(phenyl isocyanate)
Chemical Properties
Applications
4,4′-Methylenebis(phenyl isocyanate) acts as a monomer in the production of polyurethane. The rigid polyurethane foams are good thermal insulators, which find applications in all freezers and refrigerators, as well as in buildings. It is also used as an industrial strength adhesive, which is available to end consumers as various high-strength bottled glue preparations.
Notes
GHS Hazard and Precautionary Statements
Hazard Statements: H315-H317-H319-H332-H334-H335-H351b-H373
Causes skin irritation. May cause an allergic skin reaction. Causes serious eye irritation. Harmful if inhaled. May cause allergy or asthma symptoms or breathing difficulties if inhaled. May cause respiratory irritation. Suspected of causing cancer if inhaled May cause damage to organs through prolonged or repeated exposure.
Precautionary Statements: P201-P202-P264b-P271-P272-P280-P302+P352-P304+P340-P305+P351+P338-P308+P313-P342+P311-P362+P364-P403+P233-P501c
Obtain special instructions before use. Do not handle until all safety precautions have been read and understood. Wash face, hands and any exposed skin thoroughly after handling Use only outdoors or in a well-ventilated area. Contaminated work clothing should not be allowed out of the workplace. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN: Wash with plenty of soap and water. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF exposed or concerned: Get medical advice/attention. If experiencing respiratory symptoms: Call a POISON CENTER or doctor/physician. Take off contaminated clothing and wash before reuse. And wash it before reuse. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/ container to an approved waste disposal plant
Methyl di-p-phenylene isocyanate (MDI) is mainly used in polyurethane foams, which account for about 80% of global consumption. Rigid foams are mostly used in construction, refrigeration, packaging and insulation. MDI is also used to make binders, elastomers, adhesives, sealants and coatings.The positions of the isocyanate groups influences their reactivities. 4,4′-MDI is a symmetrical molecule and thus has two groups of equal reactivity. 2,4′-MDI is an asymmetrical molecule and thus has two groups of different reactivities. The group at the 4-position is approximately four times more reactive than the group at the 2-position.
Applications
The major application of 4,4′-MDI is the production of rigid polyurethane. Typically, one tonne of polyurethane foam needs 0.616 tonne of MDI and 0.386 tonne of polyol, with 0.054 tonne pentane as a blowing agent. These rigid polyurethane foams are good thermal insulators and used in nearly all freezers and refrigerators worldwide, as well as buildings. Typical polyols used are polyethylene adipate (a polyester) and poly(tetramethylene ether) glycol (a polyether).4,4′-MDI is also used as an industrial strength adhesive, which is available to end consumers as various high-strength bottled glue preparations.
Other References
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