and Epoxy Hardeners
Most common epoxy
resins are produced from a reaction between epichorohydrin & Bisphenol
A. Other materials can become part of the reaction yielding Bis F resins,
resins, and multifunctional resins.The
reaction product is high in viscosity and can either undergo further reaction
processes to yield a lower viscosity resin.
Epoxy resins are often modified using other products to improve some measured
property of the final product such as toughness or tensileness. Epoxy resins
and their additives contribute to the viscosity of the system and to the
shrinking characteristics.The amount of the fillers and diluents will impact
both the physical and handling properties of the resin system. Epoxy resins
are part of a two-component thermo-set plastic that requires an epoxy hardener
to determine the majority of the handling and physical properties of the
base.The use of several variations of unmodified and modified epoxy resins
with the same epoxy hardener will produce some variations in their properties;
however, the epoxy hardener is the primary factor in the base property.
Epoxy hardeners are not catalysts and they react with the epoxy
resins, greatly contributing to the ultimate properties of the cured epoxy
resin system.Epoxy hardeners provide: gel time; mixed viscosity; demold
time of the epoxy resin system. Physical properties of the epoxy resin system
such as tensility, compression, flexural properties, etc., are also influenced
by epoxy hardeners.
The performance of epoxy hardeners in the epoxy resins system depend on
the chemical characteristics of the epoxy resins and the physical characteristics
while applying the epoxy resins system.The chemical characteristics of the
epoxy resins that influence epoxy hardeners are: viscosity; amount and kind
of diluents and filers in epoxy resins.The physical characteristics of the
epoxy resins system influencing the behavior of epoxy hardeners in the epoxy
resins system are: temperature of the work area, temperature of the resins
system (i.e.the heated resins), and moisture (dampness).
One of the
most problem solving products available in epoxy systems today is
More about epoxy
chemistry you can find at the following link:
about epoxy resins you can find in "The Best Web Epoxy Links" eBook.