Thursday, April 9, 2009

Glycidylamine Resin

As well as reacting with hydroxyl groups to form glycidyl ethers, epichlorohydrin also react with a primary or secondary amine to form a glycidylamine. Epoxy resin of this class contain tertiary nitrogen atoms in place of the ether oxygen atoms. The amine analogue of bisphenol A is shown here as an example.

Resin of high functionally can be made from the large number of aromatic, alicyclic, and aliphatic polyamines that are available. The patent position concerning these epoxydes would appear to be somewhat confused. In this case four reactive hydrogen atoms are available, and the preparation of a tetra-epoxide becomes theoritically possible.

Although in practice the reaction result in rather fewer than four epoxide group per molecule, experience has shown glycidylamine resins to be of considerable interest in the formulation of high hot strength adhesives. One such resin is made from the d primary amine, 4,4 diaminodiphenylmethane (“methylene dianiline”), an aromatic diamine mentioned in the last article as a hardener for bishphenol A adhesives. The strength/temperature relationship of this resin cured with methylene dinaline, and also with a authetic anhydride mixture. The strength of a specially formulated adhesive based on the same glycidyl compound and containing fillers and other adhesives, and cured with methylene dianiline. The ageing characteristics of this formulated glycidylamine adhesive cured with methylene dianiline are good.

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