4,4′-Diamino-3,3′-dichlorodiphenylmethane

Details

The crude product is obtained by reacting o-chloroaniline with hydrochloric acid to generate o-chloroaniline hydrochloride, and then formaldehyde is added dropwise for condensation. The crude product is neutralized with liquid alkali, and then steam distilled, washed with water, recrystallized in dilute ethanol, dehydrated, and dried to obtain the finished product.

SPECIFICATIONS of 4,4′-Diamino-3,3′-dichlorodiphenylmethane

Structural formula:

MOCA -

Test Item(s)	Unit	Specification(s)	Test Method(s)
Appearance	-	Yellow flake solid	Visual
Melting Point	98-112℃	105℃	Point apparatus
Purity	≥90%	91.62%	GC
Free Aniline	≤1%	0.426%	GC
Amine Value (mgKOH/g)	7.4-7.6	7.45

Applications

4,4′-Diamino-3,3′-dichlorodiphenylmethane is used as a vulcanizing agent for cast polyurethane rubber, a crosslinking agent for polyurethane coating adhesives, and can also be used as a curing agent for epoxy resins. When used as a vulcanizing agent for polyurethane rubber, the dosage is generally 85% to 100% of the free isocyanate equivalent in the prepolymer. Used as a crosslinking agent for polyurethane rubber. It can also be used to cure epoxy resins. Aromatic diamines are used as chain extenders for polyurethanes and are mainly used for the vulcanization molding of TDI series prepolymers. The alkalinity of aromatic diamines is weaker than that of aliphatic diamines, and the reaction activity with -NCO is lower. It has a moderate gel time and can give the elastomer good physical and mechanical properties. Aromatic diamines used as cast polyurethanes (CPU) generally introduce steric groups or electron-withdrawing substituents into their molecules to reduce activity and provide a suitable pouring time.

Storage

Store in a dry, clean, well-ventilated warehouse. Avoid exposure to light and heat to prevent oxidation. During transportation, protect from leakage, rain, and direct sunlight.

Shelf Life

The shelf life of 4,4′-Diamino-3,3′-dichlorodiphenylmethane is 12 months under recommended storage conditions. The product stored exceeded expiration may still me used if the testing result is still qualified. For more information about safety and environment, please refer to the MSDS or contact our customer service center.

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