IIR

  1. introduction:
    IIR (Isobutylene-Isoprene Rubber, butyl rubber) is a mixture of isobutylene and a small amount of isoprene (Isoprene) that causes double bonds in an ultra-low temperature reaction tank at -100 ° C that is equipped with a polymerization catalyst and a reaction regulator. Produced by polymerization.
  2. Characteristics:
    IIR has the following advantages and disadvantages

    Advantage: Shortcoming:
    1) The permeability of various gases is extremely small 1) Poor processability
    2) High resistance to heat, sunlight and ozone 2) The compatibility with other diene rubbers is small and the compatibility is poor
    3) For ordinary acids and alkalis, better than NR, SBR 3) Poor adhesion to metals and other rubbers
    4) Excellent electrical insulation and corona resistance
    5) Small rebound, high shock absorption
  3. Classification:
    IIR is classified according to the degree of unsaturation (Isoprene amount), molecular weight (Mooney viscosity), and the type of stabilizer. In addition to the traditional IIR, the following halogenated butyl rubber
    1) Bromobutyl rubber: The chain molecules of butyl rubber are partially introduced with bromine and denatured. Vulcanization is fast, can be mixed with NR, SBR, etc., and has good adhesion to metals or other polymers
    2) Chlorinated butyl rubber: After chlorine is introduced, the vulcanization is rapid, and the compatibility with other rubbers is good. It can be vulcanized. The heat resistance of chlorinated butyl rubber is excellent. The ozone resistance and other characteristics are also comparable to those of ordinary butyl. Rubber is also excellent
  4. Uses:
    Because IIR has good airtightness and excellent insulation, it is widely used in inner tubes, underwater cables, groove linings, construction sealing materials, automotive parts and other applications.
  5. Manufacturer:
    There is currently no manufacturer in Taiwan that produces IIR, and all the raw materials required depend on imports.

    Trade Names

    brand name
    Exxon ,USA ESSO BUTYL 268, CHLOROBUTYL 1066, BROMOBUTYL 2211…
    Canada Polysar BUTYL 301, 402, XL10000……
    Japan JSR BUTYL 065, 268, 365…
    Russia *(1) BK-1675N, BK-2055….

    * (1) 蘇聯有多家廠商生產 IIR, 代表性廠商為Nizhnekamskneftechin, Togliattisyntezkauchuk.

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