Diethyl Toluene Diamine (DETDA), identified by its CAS number 68479-98-1, is a chemical compound that has carved out a significant niche in the polymer industry, primarily as a chain extender in polyurethanes and a curing agent for epoxies. Understanding its properties is crucial for chemists, formulators, and procurement professionals to leverage its capabilities effectively. As a leading producer and supplier, we aim to provide clarity on these essential characteristics.

Physical Properties: Appearance and State

DETDA is typically described as a light yellow to amber transparent liquid. This liquid state at room temperature is a significant advantage for processing, as it simplifies handling, mixing, and dosing compared to solid alternatives. Its relatively low viscosity further enhances its applicability in various industrial processes, including spray applications and injection molding.

Chemical Identity and Structure

Chemically, DETDA is an aromatic diamine with the molecular formula C11H18N2 and a molecular weight of approximately 178.28 g/mol. It is a mixture of isomers, with the primary ones being 3,5-diethyl-toluene-2,4-diamine and 3,5-diethyl-toluene-2,6-diamine. The presence of amine (-NH2) groups makes it reactive with isocyanates in polyurethane chemistry and with epoxide groups in epoxy resin systems. The aromatic nature of the molecule contributes to its enhanced thermal stability and mechanical properties once incorporated into a polymer matrix.

Reactivity and Curing Behavior

One of DETDA's most defining characteristics is its reactivity. As an aromatic amine, it reacts with isocyanates several times faster than diamines like Dimethyl Thio-Toluene Diamine (DMTDA) and significantly faster than compounds like 4,4'-Methylenebis(2-chloroaniline) (MOCA). This high reactivity is key to its use in applications requiring fast cure cycles, such as Reaction Injection Molding (RIM) and Spray Polyurea Elastomers (SPUA). In epoxy systems, this reactivity still offers a beneficial working time, allowing for effective application before curing begins.

Solubility and Compatibility

DETDA exhibits limited solubility in water but is readily soluble in various polar organic solvents such as alcohols, ethers, and ketones. It is also compatible with polyether and polyester polyols, which are common components in polyurethane formulations. This compatibility ensures that it can be effectively dispersed and reacted within typical polymer matrices.

Other Notable Properties

DETDA also possesses antioxidant properties, making it useful as an additive in industrial oils and lubricants. Its flash point is typically above 135°C, indicating a reasonable level of safety during handling, though standard precautions for chemical handling should always be observed. The density is around 1.022 g/cm³, and its boiling point is approximately 310°C.

For professionals in the chemical industry, a thorough understanding of these properties allows for the intelligent selection and application of DETDA, maximizing its benefits in creating high-performance materials. As a reliable DETDA supplier, we are committed to providing products that meet these exacting standards.