1,6-hexanediol is a colorless crystalline solid with a melting point of 42 ° C and a boiling point of 250 ° C. It is soluble in water and is an important chemical raw material. It is one of the important raw materials for various organic synthesis.
Method for synthesizing 1,6-hexanediol
Produced by catalytic reduction of diethyl adipate or dimethyl succinate in the presence of sodium metal, ethanol or lead chrome oxide, or catalytic reduction of 2,4 diyne-1,6-diol . For example, hydrogenation of diethyl oxalate is carried out. The above reaction catalyst is copper chromite, the hydrogen pressure is 3.79-20.68 MPa, the reaction temperature is 255 ° C, and the yield of the obtained product is 85%-90%.
1,6-hexanediol application field
It is used to produce polyurethane, unsaturated polyester, plasticizer, hardener for gelling agent, heat stabilizer and improver for lubricating oil. It is also used in the production of pyrethroids, organic peroxides, ring-shaped musk, polyethylene plastic crosslinkers and polyether rubber.
1) Polyurethane field: Polyurethane elastomer is widely used in synthetic rubber, elastic fiber, synthetic leather and other fields. 1,6-hexanediol can be applied to a polyester resin for modifying a polyurethane elastomer. The modified resin is excellent in mechanical strength, water resistance, heat resistance, and oxidation resistance.
2) Polyester field: Since the 1,6-hexanediol unsaturated polyester carbon chain is more difficult to hydrolyze than other short-chain alcohol unsaturated polyesters, and has better flexibility, it can improve the alkali resistance of the resin and improve Its adhesion to fiberglass. In the case of a saturated polyester, a polyester obtained from 1,6-hexanediol and 4,4-dicarboxylic acid-diphenylsulfonic acid has high tensile strength and high elasticity. Excellent solvent resistance and swell resistance, especially suitable for photographic film base. Polyesters of 1,6-hexanediol and terephthalic acid are suitable for the treatment of polyester fibers.
3) Synthetic resin additives: Plasticizers using 1,6-hexanediol have excellent performance in resistance to volatility, spray blasting, migration resistance, and low temperature resistance compared with low molecular weight plasticizers. It can be widely used in plastics, rubber, epoxy resin and other materials.