Jeffamine EDR-148 Triethyleneglycoldiamine 929-59-9 Huntsman Crosslinking / Coupling / Curing Agents >> Amine Epoxy Resins Coatings >> Solvent-Free/ High-Solids Soluble in a wide variety of solvents This new epoxy curing agent imparts the characteristic flexibilizing and toughening properties of the existing JEFFAMINE polyetheramines. However, JEFFAMINE EDR-148 is unique in that it is much more reactive than the JEFFAMINE D, T, and ED series. In fact, the “R” of EDR stands for “reactive.” Epoxy resins cured with JEFFAMINE EDR-148 can be formulated to cure at room temperature or to cure very rapidly at elevated temperatures. JEFFAMINE EDR-148, while an excellent epoxy curing agent, can also be used in a number of other applications. The product is an unhindered diamine miscible in a wide variety of solvents. Reactions typical of aliphatic diamines (polyamide formation through reaction with dibasic acids, diisocyanate reaction to form polyureas, etc.) may be expected with this polyetheramine. As expected, epoxy systems cured with JEFFAMINE EDR-148 are slightly more water-sensitive than systems cured with the JEFFAMINE D and T series amines. This sensitivity is due to the oxyethylene backbone of the JEFFAMINE EDR-148; the D and T series amines have oxypropylene backbones. However, systems cured with EDR-148 are considerably less water-sensitive than those cured with diethylene glycol bis(propylamine). Table III shows the effects of water exposure on flexural strength and modulus. Epoxy systems cured with JEFFAMINE EDR-148 exhibit excellent resistance to cracking during extreme thermal cycling. This feature should make EDR-148 an ideal epoxy curing agent for use in electrical potting and encapsulation. Table V lists the results of thermal shock testing of an epoxy system cured with EDR-148; as can be seen, none of the samples cracked in spite of the severe test conditions. COATINGS Unpigmented high-solids, epoxy coatings were made using XTJ-504 (20 phr) formulated with MNP (monononylphenol, 57 phr) and AEP (aminoethylpiperazine, 4 phr) blended to provide a hardener that could be used at a 1:1 volume ratio with a standard Bisphenol-A epoxy resin (EEW~188). This formulation was coated onto cold rolled steel panels and allowed to cure seven days at room temperature prior to testing. An attractive, glossy coating was obtained with a set-to-touch time of one hour and a through-dry time of about three hours. The small amount of AEP increased the coating’s surface hardness while the XTJ-504 still provided enough flexibility to give excellent impact and conical mandrel bend performance. Very reactive polyetheramine. Used as an epoxy curing agent in unpigmented high-solids, epoxy coatings. Imparts flexibility and toughness. Can be formulated to cure at room temperature or at elevated temperatures. Provides water-sensitivity and good resistance to cracking during extreme thermal cycling.