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CH0204 Organic Chemical Technology
Chapter 3a Plas-cs
Balasubramanian S Assistant Professor (OG) Department of Chemical Engineering
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Chapter 3 Plas-cs
Resins
Produc-on of Phenolic and Epoxy resins
Polymers and their Engineering Proper-es
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Overview of topics
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Balasubramanian S
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Resin is also hydrocarbon secre-on of many plants, par-cularly coniferous trees. It is valued for its chemical proper-es and associated uses, such as the produc-on of varnishes, adhesives, and food glazing agents; as an important source of raw materials for organic synthesis.
Resins
On the basis of deriva-on, plas-cs can also be grouped as
1. Natural resins
2. Synthe-c resins
3. Cellulose deriva-ves
4. Protein products
Resins
hOp://en.wikipedia.org/wiki/Resin
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Phenolic Resin
Steam Water
Phenol
Formaldehyde
Sulfuric acid
Phenol-‐Cresol
Process
Ac-vators Dyes
Phenolic Resins
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Phenolic Resins Production
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Phenolic resins 1. Packing films and sheets 2. Containers 3. Wire cable insula-on 4. Pipes 5. Coa-ngs, molds, and toys etc.,
Uses of phenolic resins
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Phenolic resin (Phenol formaldehyde)
Process Formaldehyde Water
Solvents
Catalyst Modifiers
Phenol-‐Cresol
Plas-cizers and fillers Hexamethylene tetramine
Phenol Formaldehyde
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Phenol formaldehyde
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The most common epoxy resin is formed by the reac-on of Bisphenol A with epichlorohydrin . Bisphenol A is made from phenol and acetone.
Epoxy resins
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Epoxy resins Bisphenol A + Epichlorohydrin Epoxide groups or polymer
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Resin Properties and its Applications
Resin Types Proper0es Applica0ons
Epoxies
Excellent chemical Resistance, good electrical and thermal proper-es adhesion proper-es, strong and tough with low shrinkage
Laminates, Adhesives, Floorings and linings
Phenolics Good strength, heat stability, and impact resistance, high resistance to moisture penetra-on and chemical corrosion
Electrical components, structural boards, Laminates, glues, and adhesives
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Polymers in engineering applications Engineering plas-cs are high-‐strength; high performance materials that can be subs-tuted for many metal uses. There are wide variety of engineering plas-cs available. Each one has its own special proper-es, and thus care must be taken in choosing a resin of par-cular use. These materials are oben the usual plas-cs but have been carefully manufactured to posses extra quality proper-es. These materials shows beOer resistance towards wear impact and corrosive chemicals and have excellent electrical proper-es. Some of the uses of engineering plas-cs are automobile bumpers and dash boards, pumps, valves and gears, drive shabs and transmission in heavy duty equipment.
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1. Dryden C. E, Outlines of Chemical technology – for the 21st Century, 3rd edi-on, East-‐West Press (2004)
2. Aus-n G. T, Shreve’s Chemical Process Industries, 5th edi-on, Mc Graw Hill Interna-onal edi-ons (1984)
3. www.wikipedia.com
References
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Thank you