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)

MDL: MFCD00036131

EINECS: 202-966-0

Chemical Properties

Formula: C₁₅H₁₀N₂O₂

Formula Weight: 250.26

Melting point: 41-44°

Boiling Point: 194°/5mm

Flash Point: 196°(385°F)

Density: 1.239

Storage & Sensitivity: Store at -20°C. Moisture Sensitive.

Solubility: Insoluble in water. Soluble in acetone, benzene and kerosene.

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

Incompatible with water, amines, strong bases, alcohols and oxidizing agents.

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

Beilstein: 797662

Harmonized Tariff Code: 2929.10

TSCA: Yes

RTECS: NQ9350000

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Methylene Diphenyl Diisocyanate (MDI)