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[Chemical Knowledge]：Properties and Uses of Diethylene Glycol

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Diethylene glycol (Diethylene Glycol, referred to as DEG) is a colorless, odorless, transparent, viscous liquid organic compounds, belongs to a kind of alcohol. It has a wide range of applications in the field of chemical production raw materials, mainly due to its unique physical and chemical properties.

1. properties of diethylene glycol

1. Physical properties
diethylene glycol has a molecular formula of C4H10O3, a molecular weight of 106.12, a density of 1.113 g/cm, a boiling point of 245 ℃, a melting point of -10.5 ℃, and a flash point of 143 ℃. It has high viscosity and surface tension, as well as good solubility and hygroscopicity.

2. chemical properties
diethylene glycol has a strong alcohol hydroxyl activity, can react with acid, ester, ether, halogenated hydrocarbon and other compounds to generate the corresponding ester, ether, halogenated hydrocarbon and other compounds. In addition, it also has oxidation resistance and stability, and can exist stably under high temperature and acidic conditions.

2. diethylene glycol use

1. solvent
diethylene glycol is an excellent solvent, can dissolve many organic and inorganic substances, such as resin, paint, dye, ink and so on. Because of its good solubility and moisture absorption, diethylene glycol is widely used in printing, printing and dyeing, coatings and other industries.

2. Antifreeze
diethylene glycol can lower the freezing point of water, so it is often used as an antifreeze to prevent pipes, water tanks and other equipment from freezing at low temperatures. In cold regions, diethylene glycol is widely used in the cooling system of automobiles, airplanes, trains and other vehicles.

3. surfactant
diethylene glycol has good surface activity, can be used as a surfactant to improve the wettability and emulsification of liquid. In daily chemical products, diethylene glycol is often used as an emulsifier and moisturizer, which can improve the texture and moisturizing effect of the product.

4. Plastic plasticizer
diethylene glycol can be used as a plastic plasticizer to improve the flexibility and processability of plastics. In plastic products, diethylene glycol can reduce the glass transition temperature of plastics and improve the processing and mechanical properties of plastics.

In short, as an important raw material for the production of chemicals, diethylene glycol is widely used in the fields of solvents, antifreeze, surfactants and plastic plasticizers.

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