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[Chemical Knowledge]：Properties and Uses of 1.4-Butanediol

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1.4-Butanediol (BDO) is an important organic chemical raw material, widely used in polymers, solvents, plasticizers, pharmaceuticals, pesticides, cosmetics and other fields. This article will detail the properties and uses of 1.4-butanediol.

1. The properties of 1.4-butanediol

1. Physical properties: 1.4-butanediol is a colorless, transparent, sweet viscous liquid with a boiling point of 228 ℃, a melting point of 20 ℃, a relative density of 1.016, a refractive index of 1.446, a flash point of 121 ℃. It is miscible with water, ethanol, acetone and other solvents, but insoluble in petroleum ether, benzene and toluene.

2. Chemical properties: 1.4-Butanediol has the typical chemical properties of alcohol, such as the reaction with carboxylic acid to generate esters, the reaction with acid chlorides to generate amides, and the reaction with aldehydes to generate acetals. In addition, it also has the nature of double bonds, can be added, oxidation, polymerization and other reactions.

2. The use of 1.4-butanediol

1. Polymer field: 1.4-butanediol is the main raw material for the production of polybutylene terephthalate (PBT) engineering plastics and polyurethane (PU) elastomers. PBT has excellent heat resistance, weather resistance, electrical insulation and dimensional stability, and is widely used in automotive, electrical and mechanical industries. PU has the advantages of high strength, high elasticity and wear resistance, and can be used in shoe-making, furniture, construction and other fields.

2. Solvent Field: 1.4-Butanediol can be used as a solvent, for example, in the manufacture of paints, coatings, inks, and the like. Because of its high boiling point and low toxicity, it has advantages in high temperature and environmental protection.

3. Plasticizer Field: 1.4-Butanediol can be used as a plasticizer to improve the processability and flexibility of plastics. It is widely used in plastics such as polyvinyl chloride (PVC) to improve its processability and service performance.

4. Pharmaceutical Field: 1.4-Butanediol is useful as a drug carrier, excipient, etc. in the pharmaceutical field. For example, it can be used as a drug solvent to improve the stability and bioavailability of the drug.

5. Pesticide field: 1.4-butanediol can be used as a solvent and synergist for pesticides such as pesticides and fungicides in the pesticide field, which can improve the effect of pesticides and reduce their toxicity.

6. cosmetics field: 1.4-butylene glycol can be used as moisturizing agent and preservative in cosmetics, which has the functions of moisturizing, antibacterial and antiseptic, and can improve the quality and safety of cosmetics.

In conclusion, 1.4-butanediol as an important organic chemical raw material has a wide range of applications in polymers, solvents, plasticizers, pharmaceuticals, pesticides, cosmetics and other fields. With the continuous development of science and technology, its application field will continue to expand.

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