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EPOXY
 
1. INTRODUCTION
Epoxies are synthetic thermosetting resins. These Resins which are liquids or brittle solids would be of use only when they are cured by the additions of hardener also called curing agent or catalyst. Once cured by the addition of hardener they become hard irreversible systems. It is the hardener, which controls the properties of an epoxy system. Thermosets do not melt but decomposes at high temperature. Thermosets are phenol formaldehyde urea formaldehydes, melamine, Epoxy Resins, Unsaturated polyesters, Silicon’s etc.

Thermosetting resins display good creep resistance and exposure to serve environmental condition such as heat, cold, radiation, humidity and chemical atmosphere. The cured epoxies possess excellent mechanical, physical and chemical properties and can be used up to about 80°C. once the resin and hardener are mixed, curing begins and proceeds at a rate depended upon the factors such as temperature and reactivity of resin and hardener towards each other. Usually the curing agent is exothermic. Many a times other materials are required to be added so as to modify the properties of the cured resin. There are about 15 to 20 different types of resins in market and over 300 hardeners so that the possible number of combination of resin and hardener is very high. The formulators can make various formulations suitable for the required application.

Epoxy resins and hardeners are supplied by manufacturers in the form of a liquid in separate packings. A combination of Resin & Hardener is referred to as the epoxy resin system. Epoxide resins, if desired, are modified by the addition of dilutents, fillers & flexibilizing modifiers to suit the purpose for which they are to be used.

 
EPOXY / POLYMER MORTAR COMPARISON WITH CEMENT MORTAR.
 
Mechanical Properties
Units.
Concrete.
Polymer.
STYRENE
BASE POLYMER.
ACRYLIC
BASE POLYMER.
Epoxy.
Compressive Strength.
Kg / cm²
300 – 500
320
340
800 – 1200
Tensile Strength.
Kg / cm²
40 – 60
33
----
150-250
Flexural Strength.
Kg / cm²
50-80
143
90
250-400
Modulus of Elasticity.
Kg / cm²
5
30X10
----
----
5
1.6X10
Elongation at break.
%
0.02
----
----

0.1

Coefficient of expansion.
-1 degree C
-5
1.2X10
----
----
-5
2.5X10
Bond strength
----
----
----
80
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