Page 80 - Machinery Component Maintenance

Chapter 3

Machinery Foundations and

What’s An Epoxy?

According to the Handbook of Epoxy Resins’, the term q)o.t-x refers to
a chemical group consisting of an oxygen atom bonded with two carbon
atoms already united in some other way. The simplest epoxy is a three-
membered ring. There is no universal agreement on the nomenclature 01’
the three-membered ring. There is division even on the term epoxy it-
self-the Europeans generally prefer the term epmidc, which is doubt-
less more correct than the Amcrican q)oxJ.
In addition to providing a history of the clevelopnient of epoxy resins.
the handbook states that the resins are prepared commercially thus:
I. By dehydrohalogenation of the chlorohydrin prepared by the reac-
tion of epichlorohydrin with a suitable di- or polyhydroxyl material
or other active-hydrogen-containing molecule.
3. By the reaction of olefins with oxygen-containing compounds such
as peroxides or peracids.
3. By the dehydrohalogenation of chlorohydrins prepared by routes
other than by route 1.

At the present time more than 25 distinct types of resins arc conimer-
cially available, and the term c’po-rj resin is generic. It now applics to ;I
wide family of materials. Both solid and liquid resins are available.

* E. M. Kenfro. I? E. Adhesive Services Company. Houston. ‘I‘CXdS
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