Tính chất nổi bật nhất của họ
cao su butyl là tính không thấm khí nên chúng được dùng làm lớp lót trong hoặc
ruột lốp xe. Tính chất đặc trưng của các loại cao su butyl chính được trình bày
bên dưới.
…
Butyl rubber (IIR) is the
copolymer of isobutylene and a small amount of isoprene. Patented in 1937 and
first commercialized in 1943, the primary attributes of butyl rubber are
excellent impermeability for use as an air barrier and good flex fatigue
properties. These properties result from low levels of unsaturation in between
the long polyisobutylene chain segments. Tire innertubes were the first major
use of butyl rubber, and this continues to be a significant market
today.
The development of halogenated
butyl rubbers started in the 1950s. These polymers greatly extended the
usefulness of butyl rubbers by having faster curing rates and increased
polarity. This enabled covulcanization with general-purpose elastomers such as
natural rubber (NR), butadiene rubber (BR), and styrene butadiene rubber (SBR)
that are used in tire compounds. The enhanced cure properties do not affect the
desirable impermeability and fatigue properties, thus permitting development of
more durable tubeless tires in which the air barrier is an innerliner compound
chemically bonded to the carcass ply. Today, tire innerliners are the largest
application for halobutyl rubber. Both chlorobutyl (CIIR) and bromobutyl (BIIR)
rubbers are used commercially.
…
Trích đăng từ tài liệu Rubber compounding: Chemistry and
Applications, Brendan
Rodgers, CRC Press,
2004
(vtp-vlab-caosuviet)
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