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General
- Butyl rubber was first
developed in the 1940’s by German chemists and commercialized in 1943.
- The typical composition of
butyl rubber is approximately 98% polyisobutylene,with the balance being
isoprene. The isoprene units contain a double bond that provides a site
for cross linking during vulcanization and are located randomly in the
polymer chain.
- Polyisobutylene has
interesting properties when used as an additive in lubricating oils and
motor fuels.
Process
-
Butyl
rubber is mixed with best quality chemicals and after proper mixing in
the desired temperature and time the same is than delivered to the
extruding section and the correct size of the required dimension is
extruded
-
The
extruded pieces are cut to the appropriate lengths and valve are jamed
and the end joined properly under a process well known as splicing in
this trade.
-
After
due curing of the tubes they are than vacuumed and tested 100% before
the same is delivered to the packing section for packing and sending to
the customers in proper transport with a view for safe and prompt
delivery.
Application
- Polyisobutylene added in
small amounts to the lubricating oils used in machining results in a
significant reduction in the generation of oil mist and thus reduces the
operator's inhalation of oil mist.
- Regular butyl is the
preferred material for inner tubes, which are manufactured in various
sizes from lightweight bicycles to lifestyle bicycles, and from day-use
motorcycles to luxury motorcycles.
- Halo butyl rubber is
mainly used for tire inner liner compounds, because of its low air
permeability. Bromobutyl is superior to Chlorobutyl, but is more
expensive.
- Butyl rubbers are used in
tyre inner tubes and other products that require a good barrier against
gases. The thermal stability of these rubbers makes them suitable for
use in automotive radiator hoses.
Report
- LANXESS is a leading
producer of butyl rubber which is used in a wide range of applications.
The butyl market will grow over the next 15 years and LANXESS expansions
will be needed.
- A major disadvantage
of nonhalogenated butyl rubber is its inability to be blended and
vulcanized with highly unsaturated elastomers such as styrene-butadiene
rubber (SBR), polybutadiene and natural rubber.
- Worldwide, several
companies produce butyl elastomers in different countries. The leading
world producers are ExxonMobil and Lanxess.
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