Introduction, types, raw material, reaction mechanism, manufacturing process, flow sheet of production process, properties, applications, industries in India, commercial name
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INTRODUCTION
EPOXY RESINS- The resins which have at least two epoxy groups per
molecule are known as epoxy resins
EPOXIDE- An epoxide is a cyclic ether with a 3 atom ring.
ETHER – R-O-R’
eg. CH₃-CH₂-O-CH₂-CH₃
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types
i. Bisphenol A epoxy resin
ii. Bisphenol F epoxy resin
iii. Novolac epoxy resin
iv. Aliphatic epoxy resin
v. Glycidylamine epoxy resin
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RAW MATERIAL
i. Bisphenol-A
ii. Epichlorohydrine
iii. Sodium hydroxide
iv. Methylisobutylketone
The raw materials for epoxy resin production are largely
petroleum derived, although some plant derived sources are
now becoming commercially available (e.g. plant derived
glycerol is used to make epichlorohydrin)
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reaction mechanism
Epoxy prepolymer formed from bisphenol –A and epichlorohydrin by step
growth polymerisation
STEP I --- Formation of low molecular weight prepolymer called diepoxy
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The first thing that happens is that the NaOH does a little swap with the bisphenol A,
to give the bisphenol A sodium salt:
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manufacturing process
Suspension Polymerisation is used
Machinery and Equipments Required
i. Storage tank
ii. Water tank
iii. Recovery Tank
iv. Salt solution Tank
v. Reactor
vi. Evaporator
vii. Condenser
viii. Filter
ix. Pump
x. Vacuum pump
xi. Boiler
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First Stage Reaction (exothermic) -- Epoxy radical is separated from epichlorohydrine to
be attached to hydroxyl radical, thus producing chlorohydrine ether.
Second Stage Reaction - the produced chlorohydrine ether causes a dechloration reaction
to occur in the presence of NaOH, producing a terminal epoxy radical.
The ether of bisphenol-A produced as a result continues to react with bisphenol-A and
epichlorhydrine and gradually forms a high polymer. On completion of polymerization, the
polymer is transferred through storage tank to the epichlorohydrine separation
evaporator, where epichlorohydrine is separated under vacuum.
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PROPERTIES
i. High thermo stability
ii. High abrasion resistance
iii. Acceptable drying time
iv. Low shrinkage
v. Excellent weather/ chemical resistance
vi. Excellent adhesive strength
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APPLICATIONS
i. Paints and coatings
ii. Adhesives
iii. Industrial tooling and composites
iv. Electrical systems and electronics
v. Petroleum & petrochemical
vi. Consumer and marine applications
vii.Aerospace applications
viii.Biology
ix. Art
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INDUSTRIES IN INDIA
i. Swastik Interchem Private Limited – New Delhi
ii. Noble Corporation – Mumbai
iii. Paladin Paints and Chemicals Private Limited – Mumbai
iv. Umiya Group of Companies – Vapi
v. Synpol Products Private Limited – Ahmedabad
vi. Fibrex Construction Chemicals Private limited – Faridabad
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COMMERCIAL NAME
i. Liquid Glass - Heritage
ii. Lapox Epoxy Resin - Duratite
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COMMERCIAL NAME
i. Araldite Epoxy Barrier Coat
ii. Resin & Hardener (High Gloss Epoxy Resin Clear Coat) - Haksons
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i. https://en.wikipedia.org/wiki/Epoxy#History
ii. https://en.wikipedia.org/wiki/Epoxide
iii. http://pslc.ws/macrog/eposyn.htm
iv. http://processflowsheets.blogspot.in/2011/05/epoxy-resin-manufacturing-
process.html
v. Fundamentals of Polymers by Niranjan Karak
references
