256439

4,4′-Methylenebis(phenyl isocyanate)

98%

• Synonym(s): 4,4′-MDI, Bis(4-isocyanatophenyl)methane
• Linear Formula: CH₂(C₆H₄NCO)₂
• CAS Number: 101-68-8
• Molecular Weight: 250.25
• Beilstein/REAXYS Number: 797662
• EC Number: 202-966-0
• MDL number: MFCD00036131
• UNSPSC Code: 12162002
• PubChem Substance ID: 24855527
• NACRES: NA.23

Properties

• Quality Level: 200
• assay: 98%
• form: solid
• reaction suitability: reagent type: cross-linking reagent
• bp: 200 °C/5 mmHg (lit.)
• mp: 42-45 °C (lit.)
• density: 1.18 g/mL at 25 °C (lit.)
• storage temp.: −20°C
• SMILES string: O=C=Nc1ccc(Cc2ccc(cc2)N=C=O)cc1
• 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: UPMLOUAZCHDJJD-UHFFFAOYSA-N

Description

General description

4,4′-Methylenebis(phenyl isocyanate) (MDI) is an aromatic diisocyanates class of monomer that is widely used in the production of polyurethane plastics, foam insulation, coatings, adhesives, and sealants. It is highly reactive due to the presence of two isocyanate functional groups. MDI is known for its excellent strength, durability, and resistance to chemical and environmental damage, which makes it useful in resin composition, lithographic printing plates, coating films, optical films, image display devices, semiconductor devices, and polyurethane foam production.

Application

4,4′-Methylenebis(phenyl isocyanate) can be used as a starting material to synthesize:

• Polyurethane cationomers, that are applicable in medical implants.
• A prepolymer for preparing self-healable polyurethane elastomers.

It can also be used as a cross-linking agent to synthesize PEBA (polyether-block-amide) copolymer with improved mechanical properties, which are mainly used in soles, medical tubes, aerospace parts, and chemical separation. Additionally, MDI is also used as a crosslinker to covalently modify graphene oxide (GO) and enhance the corrosion resistance of polystyrene coatings. The resultant polystyrene/GO-MDI composite coatings showed superior corrosion resistance to unmodified polystyrene coatings. This approach can potentially be used to improve the durability of materials in various industrial and biomedical applications.

Safety Information

• pictograms: GHS08,GHS07
• signalword: Danger
• hcodes: H315,H317,H319,H332,H334,H335,H351,H373
• pcodes: P202 - P260 - P280 - P302 + P352 - P305 + P351 + P338 - P308 + P313
• Hazard Classifications: Acute Tox. 4 Inhalation - Carc. 2 - Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - Skin Sens. 1 - STOT RE 2 Inhalation - STOT SE 3
• target_organs: Respiratory system
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: 411.8 °F - closed cup
• flash_point_c: 211 °C - closed cup
• ppe: dust mask type N95 (US), Eyeshields, Faceshields, Gloves