4,4'-Methylenebis(3-chloro-2,6-diethylaniline) TCI M3183

4,4'-Methylenebis(3-chloro-2,6-diethylaniline), listed under CAS number 106246-33-7 and frequently abbreviated MCDEA in the technical literature, is a non-heterocyclic building block supplied by TCI. Structurally it is an aromatic diamine built from two aniline rings joined by a methylene bridge. Each ring carries ethyl groups at the positions ortho to the amino function together with a chlorine atom, which makes the molecule both sterically hindered and electronically modified. In the laboratory it is known primarily as a curing agent or chain extender for thermoset resin systems, particularly epoxies and polyurethanes, and as a diamine monomer in high-performance polymer research.

The property that leads researchers to select this material is the deliberately moderated reactivity of its aromatic amino groups. The flanking ethyl substituents shield the amine sterically, while the electron-withdrawing chlorine atom reduces its nucleophilic character. Together these effects give a longer working time, or pot life, than unhindered aromatic diamines provide. That extra margin lets a researcher mix, pour, and degas a resin system before cure advances significantly, which matters for castings, laminates, and any formulation where trapped air would compromise the result. The rigid double aromatic backbone also contributes stiffness to the polymer network that forms.

In Indonesian laboratories this compound is typically handled in polymer chemistry and materials research groups at universities, government research institutes, and industrial R&D units working on coatings, adhesives, and composite matrices. The 25 g pack size suits bench-scale formulation studies, cure kinetics experiments, and comparative screening of hardeners, where only small quantities are consumed per trial. Researchers running method development or thesis-scale work generally find this quantity appropriate for repeated small batches rather than production use.

• Epoxy resin curing studies, where the hindered aromatic amine allows controlled network formation and gives researchers a workable pot life for mixing and degassing before gelation begins.
• Polyurethane chain extension research, in which the diamine functionality links prepolymer segments and the rigid aromatic backbone contributes hard-segment stiffness to the resulting elastomer network.
• High-performance polymer synthesis, using the compound as a diamine monomer whose substituted aromatic rings build thermal and mechanical rigidity into the polymer chain being investigated.
• Cure kinetics and pot life investigations, where the moderated amine reactivity produces a slower, more measurable reaction profile than unhindered aromatic diamines can offer for comparison.
• Composite matrix formulation work, where the extended working time permits thorough fiber wetting and void removal before the thermoset matrix advances toward its final crosslinked state.

• Chemical class: aromatic diamine, methylene-bridged, non-heterocyclic building block

Keep the container tightly closed and store it in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and incompatible materials such as strong oxidizing agents and acids. The original supplier container is the most suitable storage vessel; if the material must be transferred, use a clean, dry, chemically compatible container that is clearly labelled with the substance name and CAS number. Handle the compound inside a fume hood and wear appropriate personal protective equipment, including safety glasses, chemical-resistant gloves, and a laboratory coat, since aromatic amines require care in avoiding skin contact and inhalation of dust. Always consult the manufacturer's safety data sheet before use, and follow institutional procedures for chemical waste disposal.

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