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Use of propylene glycol
1. Propylene glycol is an important raw material of unsaturated polyester, epoxy resin, polyurethane resin, plasticizer and surfactant, which accounts for about 45% of the total consumption of propylene glycol. This kind of unsaturated polyester is widely used in surface coatings and reinforced plastics. Propylene glycol is widely used as hygroscopicity, antifreeze, lubricant and solvent in food, medicine and cosmetics industry because of its good viscosity, hygroscopicity and non-toxicity. In the food industry, propylene glycol reacts with fatty acids to form propylene glycol fatty acid esters, which are mainly used as food emulsifiers; propylene glycol is an excellent solvent for condiments and pigments. Because of its low toxicity, it is used as a solvent for spices and edible pigments in the food industry. Propylene glycol is often used in the pharmaceutical industry as a solvent, softener and excipient in the manufacture of various ointments, ointments, vitamins, penicillin and other solvents in the pharmaceutical industry. Propylene glycol is also used as a solvent and softener in cosmetics because of its good solubility with various perfumes. Propylene glycol is also used as a solvent for tobacco humidifier, mildew inhibitor, lubricant for food processing equipment and food marking ink. The aqueous solution of propylene glycol is an effective antifreeze. It is also used as tobacco wetting agent, mould inhibitor, fruit ripening antiseptic, antifreeze liquid and heat carrier.
2. for organic synthesis, as solvent, dehydrant, plasticizer, antifreeze, gas chromatography stationary liquid.
3. commonly used raw materials for organic synthesis, used in the manufacture of unsaturated polyester resins. It can also be used as emulsifier, preservative and antifreeze. It is also used in the manufacture of alkyd resin, polypropylene glycol, plasticizer, surfactant and lubricant. Because of its good hygroscopicity and low toxicity, it has been used as a solvent of blending agent, antiseptic, ointment, ointment, pills and vitamins in the pharmaceutical industry, and as a softener and excipient. A solvent used in food industry as spices, condiments and edible pigments. It is also used as a humidifying agent for tobacco, an antimildew agent, a fruit ripening antiseptic, a film forming agent for paint, an antifreeze agent and a heat transfer medium. It is also often used as a substitute for ethanol and glycerol. It can be used as a wetting agent in toothpaste and cosmetics with glycerol or sorbitol.
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