Propylene glycol
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Propylene glycol is an important raw material for unsaturated polyester, epoxy resin and polyurethane resin, accounting for about 45% of the total consumption of propylene glycol. Such unsaturated polyester is widely used in surface coatings and reinforced plastics.
Propylene glycol has good viscosity and hygroscopicity, and is non-toxic, so it is widely used as a humectant, antifreeze, lubricant and solvent in the food, pharmaceutical and cosmetic industries.
In the food industry, propylene glycol reacts with fatty acids to produce propylene glycol fatty acid esters, which are mainly used as food emulsifiers; propylene glycol is an excellent solvent for condiments and pigments.
In the pharmaceutical industry, propylene glycol is commonly used as a solvent, softener and excipient for the manufacture of various ointments and pastes. It also has good miscibility with various fragrances, so it is also used as a solvent and softener for cosmetics.
Propylene glycol is also used as a humectant and antifungal agent for tobacco, lubricant for food processing equipment and solvent for food marking inks. The aqueous solution of propylene glycol is an effective antifreeze agent.
