Isoprene

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Isoprene
Isoprene

Alias: 2-methyl-1,3-butadiene
English alias: 2-Methyl-1,3-butadiene
CAS: 78-79-5
EINECS: 201-143-3
Chemical formula: C5H8
Molecular weight: 68.12
InChI: InChI=1/C5H8/c1-4-5(2)3/h4H,1-2H2,3H3
Density: 0.68
Melting point: -146℃
Boiling point: 34℃
Flash point: -48℃
Water solubility: 0.07 g/100 mL
Refractive index: 1.4205

Physical and chemical properties:

Properties Colorless, volatile, irritating oily liquid.
Boiling point 34.07℃
Freezing point -145.96℃
Relative density 0.681
Refractive index 1.4219
Flash point -48℃
Solubility Insoluble in water, soluble in benzene, soluble in ethanol, ether and acetone.

Product use: It is mainly used to produce polyisoprene rubber with properties close to natural rubber, and is also the second monomer of butyl rubber and SIS thermoplastic elastomer
Downstream products: 1-Chloro-3-methyl-2-butene Methylheptenone

Traits

Colorless, volatile, irritating oily liquid. Freezing point -145.96 ℃. Boiling point 34.07 ℃. Flash point -48 ℃. The auto-ignition point is 220°C. Insoluble in water, soluble in benzene, easily soluble in ethanol, ether and acetone. Forms explosive mixtures with air, explosion limit > 1.6%.

Use

It is mainly used in the production of polyisoprene rubber, and is also the second monomer of butyl rubber. It is also used in the manufacture of pesticides, medicines, spices and adhesives.

Safety

  • Vapors and liquids can irritate eyes, skin and respiratory system. 04mg/L。 High concentration of steam has anesthetic effect, oral damage to internal organs, the maximum allowable concentration in the air is 0. 04mg/L. The workplace should be well ventilated and operators should wear masks.
  • Use metal buckets, and place the container to prevent damage. Best stored outdoors or in a flammable warehouse. 05%～0. 06%的polymerization inhibitor is often added during storage because the molecule contains conjugated double bonds and is prone to polymerization. Samples were taken weekly for analysis to verify inhibitor and polymer content.