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Epoxy resins
liquid epoxy resins
| solid epoxy resins
| solvent-cut epoxy
resins | poly-functional
epoxy resins | cycloaliphatic
epoxy resins | reactive
diluents | curing
agents
Epoxy or polyepoxide is a thermosetting epoxide polymer
that cures when mixed with a catalysing agent or 'hardener'.
Most common epoxy resins are produced from epichlorohydrin
and bisphenol-A. They have excellent adhesion, chemical
and heat resistance, mechanical strength and electrical
insulating properties. Aditya Birla Chemicals (Thailand)
Ltd. markets epoxy resins under its brand EPOTEC.
Almost any property of epoxies can be modified (for
example, silver-filled epoxies have good electrical
conductivity even though epoxies are typically insulating).
Basic epoxy resins are modified for different applications
by adding mineral fillers, flexibilisers, viscosity
reducers, colourants, thickeners, accelerators, adhesion
promoters, etc. These modifications reduce costs as
well as improve performance and processing convenience.
Each formulation is carefully tailored to the requirements
of a particular application or market.
Applications for epoxy-based materials
include coatings, adhesives, composite materials, industrial
tooling, civil engineering materials, electrical and
electronic materials.
Liquid
epoxy resins
Solid epoxy resins
| Medium
molecular weight (standard viscosity) epoxy resins |
| These epoxy resins with different
molecular weights and viscosities are suitable for
general purpose powder coatings for electric panel
boards, automobile spares, bathroom fittings, decorative
articles and fixtures. |
| Medium
molecular weight (low viscosity) epoxy resins |
| Specially formulated medium molecular
weight (low viscosity) Epotec® Epoxy resins
give the maximum flow, clarity and chemical storage
stability to the powder. They are recommended for
use in the applications where aesthetics with protection
is equally important. These Epotec® grades are
extensively used for white/grey goods. |
| Modified
epoxy resins |
| Flow Modified Epotec® Epoxy Resins
are designed to improve flow and leveling characteristics
of a resin. They are primarily used in special formulations
to meet the end use requirements of critical applications. |
| Dimer/
elastomer modified epoxy resins |
| Improved adhesion and flexibility
and are mainly used for coatings and adhesives |
| High
molecular weight epoxy resins |
| High molecular weight Epotec®
epoxy resins are used extensively in coatings for
food and beverage cans like seafood cans, beer cans
and fruit juice cans. They are also used in enclosures
for glass bottles, crown caps, coatings for aerosol/perfume
spray bottles, general lining for dry food packs
such as containers for cookies, cold creams, marker
pens, roofing sheets, sheets for appliance bodies,
sheet metal furniture and modulated office cabins. |
| Unmodified
bisphenol-F based epoxy resins |
| Bisphenol-F based Epotec® epoxy
resins have advantage over their counterparts based
on Bisphenol-A owing to their lower melt viscosity.
Lower in viscosity, they are used for applications
in adhesives, laminates, coatings, and civil engineering.
They have good chemical resistance and good mechanical
properties. |
Solvent-cut epoxy resins
| Solvent-cut
epoxy resins |
| Solvent-cut bisphenol-A
based Epotec® epoxy resins have medium molecular
weight and are supplied in solution form for the
ease of processing. They are used in protective
coatings, marine paints and varnishes. |
Poly-functional epoxy
resins
Poly-functional Epotec®
epoxy resins contain more than two epoxy groups
per molecule and are multifunctional epoxy resins.
Presence of high functionality makes them suitable
for very high chemical and high temperature resistance
applications. When properly cured, these resins
exhibit very good retention of mechanical properties
at elevated temperature.
The most widely used poly-functional epoxy resins
are those based on Phenol Novolacs. Typical applications
include composites, high temperature resistant adhesives,
corrosion resistant coatings, industrial maintenance
paints, chemical resistant coatings and linings |
| Phenol
Novolac epoxy resins |
|
Bisphenol-A
Novolac epoxy resins
|
Cycloaliphatic
epoxy resins
Reactive
diluents
Curing agents
| Curing agents are a vital
part of the Epotec® epoxy resin and curing agent
system. The selection of right curing agent is very
important as it influences the viscosity, reactivity
and working time in general and mechanical, chemical
and optical properties in specific. |
| Modified
aliphatic amine curing agents |
| Modified aliphatic amines are curing
agents derived from aliphatic amines. The basic
aliphatic aminess are modified to reduce their vapour-pressure
and thereby reduce their corrosiveness. The modification
optimises the hardness, reactivity, handling time
of system and improves the carbonation resistance. |
| Modified
cycloaliphatic amine curing agents |
| Modified cycloaliphatic amines are
curing agents, which work at room temperature. Excellent
colour and lower corrosiveness makes them the preferred
choice for self-levelling floorings, primers, topcoats,
mortars and water wipe-able tile grouts. These curing
agents possess low yellowing tendency and have good
early water spotting resistance. |
| Phenolic
curing agents |
| Phenolic curing agents are used with
poly-functional Epotec® epoxy resins. They provide
excellent chemical resistance and adhesion to the
surface. They retain properties at elevated temperatures
and when formulated properly. They are also widely
used in functional coatings like FBE coatings for
re-bar and pipeline coatings. |
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