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Introduction
- Polyvinyl
chloride, (IUPAC Polychloroethene) commonly abbreviated PVC, is
a widely used thermoplastic polymer.
- Vinyl
chloride is a colourless gas with a characteristic mild, sweet
odour. A toxic and hazardous material, vinyl chloride has been
classified as a group A, human carcinogen.
- PVC is a
thermoplastic material. Thermoplastic materials are those that
can be melted again and again.
- PVC is
strong, lightweight, durable and versatile.
Manufacturing Process
- Vinyl
chloride monomer (VCM) is used almost exclusively in
polyvinyl chloride (PVC) manufacture.
- The
basic raw materials for PVC are derived from salt and oil.
-
Polyvinyl chloride is produced by polymerization of the
monomer vinyl chloride.
- The
chemical process for making PVC involves three steps: first,
production of the monomer, vinyl chloride; then the linking
of these monomer units in a polymerisation process; and
finally the blending of the polymer with additives.
- There
are four polymerization routes for the manufacture of PVC.
They are as follows : Suspension Polymerization, Emulsion
Polymerization, Bulk or Mass Polymerization, Solution
Polymerization.
Uses
-
PVC is commonly used as the insulation on electric
wires; the plastic used for this purpose needs to be
plasticized.
-
Polyvinyl chloride is also widely used for producing
pipes.
-
Nowadays, PVC is commonly used in the construction
sector, for example in window frames and shutters, pipe
cabling and coating, etc..
- It
can be used for flooring, windows and door frames and
shutters, water and waste pipes, electrical applications
such as cable and wire insulation materials,
architectural glazing systems, wallpaper, etc.
-
PVC has been widely used for surgery, pharmaceuticals,
drug delivery and medical packaging.
-
Worldwide PVC is the leading raw material for window
frames when it comes down to the fact of comparing
weather resistance, mechanical properties and price.
Market
-
PVC
itself is highly dependent on the construction
market, which reflects the ups and downs of the
world economies.
-
The
global VCM market has been growing at nearly
4%/year. However, growth rates in the developed
world have been slipping as these markets mature
while stronger demand growth has been seen in Asia,
in particular China and India.
-
It is
estimated that the present consumption of PVC pipes
is approximately 800,000 tons per annum in India.
-
In
line with Asia-Pacific GDP growth, demand growth for
PVC in 2005 is estimated at 7%, representing an
increase from approximately 13 million tons in 2004
to almost 14 million tons in 2005.
-
Existing and projected demand for high-quality PVC
is still expected to be supplied by ethylene-based
manufacturers.
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