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[Chemical Knowledge]：Properties and Uses of Propylene Glycol

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Propylene glycol is a widely used raw material in the field of chemical production, with many important properties and uses. This article will detail the nature of propylene glycol, production methods, quality standards, safety and main use of information.

1. the nature of propylene glycol

propylene glycol is a colorless, tasteless, transparent, viscous liquid, with strong moisture absorption and moisture retention. Its molecular formula is C3H8O2, which belongs to the glycol compound and has two hydroxyl functional groups, so it has good chemical stability, oxidation resistance and thermal stability. Propylene glycol is miscible with water, ethanol and other solvents, can dissolve a variety of organic and inorganic substances, and has good solubility.

2. Propylene Glycol Production Methods

Propylene Glycol production methods mainly include esterification, chlorination and biological fermentation. Among them, the esterification method is the main production method at home and abroad, the method uses propylene as raw material, through oxidation, esterification, hydrolysis and other reactions to produce propylene glycol.

3. the quality standard
of propylene glycol
In order to ensure the quality and safety of propylene glycol, it is necessary to strictly control its purity, acidity, moisture, color and other indicators. Generally speaking, the purity of industrial grade propylene glycol should be not less than 99.5, acidity not more than 0.005, moisture not more than 0.1, color not more than 30APHA. The safety of

4. propylene glycol

propylene glycol has certain irritation to human skin and eyes, but relatively low toxicity. In the use of the process should avoid contact with food and eyes, such as accidental contact should immediately rinse with water. In addition, propylene glycol should be stored in a cool and ventilated dedicated warehouse, away from fire and heat sources.

5. the main use of propylene glycol

1. chemical raw materials: propylene glycol can be used as the production of unsaturated polyester resin, polyurethane, plasticizer and other chemical products raw materials.
2. moisturizing agent: propylene glycol has good moisturizing properties, can be used as cosmetics, skin care products in the moisturizing agent, so that the skin to keep moist.
3. Antifreeze: propylene glycol has a low freezing point and can be added to automobile coolant, antifreeze and other products as an antifreeze to reduce the freezing point and prevent freezing.
4. Solvent: Propylene glycol has good solubility and can be used as a solvent in the production of inks, dyes, coatings and other products.

In conclusion, propylene glycol, as an important chemical raw material, has a wide range of applications in the field of chemical production. Relevant safety regulations shall be strictly observed during use to ensure product quality and production safety.

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