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[Chemical Knowledge]：Properties and Uses of 1,3-Propanediol

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1,3-Propanediol (PDO) is an important organic chemical raw material, which is widely used in the field of chemical production. This article will detail the properties and uses of 1,3-propanediol.

1. 1,3-Propanediol Properties

1. Physical Properties
1,3-Propanediol is a colorless transparent viscous liquid with hygroscopicity. It has a boiling point of 210-212°C, a melting point of -27°C, a relative density (water = 1) of 1.06, a refractive index (nD20) of 1.446, and a flash point of 99°C. Furthermore, 1,3-propanediol is miscible with solvents such as water, ethanol and ether, but insoluble in organic solvents such as benzene, chloroform and carbon tetrachloride.

2. chemical properties
1,3-propylene glycol molecule contains two hydroxyl functional groups, so it has high reactivity. It can occur esterification, etherification, oxidation, reduction, condensation and other reactions to generate a variety of derivatives. In addition, 1,3-propanediol also has oxidation resistance and stability, and can exist stably under high temperature and acidic conditions.

2. 1,3-Propanediol Use

1. Polymer Monomer
1,3-Propanediol can be used as a polymer monomer for the production of polyester, polyurethane and other polymer compounds. It reacts with dibasic acid to produce polyester and dihydric alcohol to produce polyurethane. These polymer materials are widely used in plastics, fibers, adhesives and other fields.

2. Solvent and plasticizer
1,3-propanediol has good solubility and low toxicity, and can be used as a solvent and plasticizer. In the paint, ink, printed circuit board and other industries, 1,3-propylene glycol can be used as a solvent to improve the fluidity and drying performance of the product. In addition, it can also be used as a plasticizer to improve the flexibility and processing properties of polymer materials.

3. Preservative
1,3-propanediol has certain antibacterial properties and can be used as a preservative for food, cosmetics and other products. It can effectively inhibit the growth of bacteria and mold and extend the shelf life of the product.

4. Other uses
In addition to the above several uses, 1,3-propylene glycol can also be used as a fuel additive, antifreeze, wetting agent, etc. In the field of medicine, it can be used as drug carrier and drug synthesis intermediate.

In conclusion, 1,3-propanediol, as an important organic chemical raw material, has broad application prospects in the field of chemical production. With the continuous development and progress of science and technology, the application field of 1,3-propanediol will continue to expand.

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