Propylene glycol is an important raw material of unsaturated polyester, epoxy resin, polyurethane resin, the amount is about 45% total consumption of propylene glycol. This unsaturated polyester are largely used for surface coatings and reinforced plastics. The viscous and hygroscopic of propylene glycol is good, and it is nontoxic. As a result, this product is widely used as hygroscopic agent, antifreeze, lubricants and solvents in the food, pharmaceutical and cosmetic industries.
In the food industry, propylene glycol reacts with fatty acid to have propylene glycol esters of fatty acids, this is primarily used as a food emulsifier; it is and excellent solvent of pigments and condiment. Propylene glycol used in the pharmaceutical industry for manufacturing of various ointments, ointments solvents, softeners and excipients, etc. Due to the propylene glycol has better solubility with various spices, thus it also used as solvents and softeners for cosmetics.
Pharmaceutical grade propylene glycol is at the begining is major produced by United States Dow Chemical, United States Lyondell company. Later, Lyondell Korea factory transferred to SK Group, coupled with the sea shell factory in Huizhou. Currently, the major four brands are being sold. A certain proportion of propylene glycol and water mixture can slow the hydrolysis of certain drugs and increase its stability. When its concentration is appropriate as a solvent for injection.
Propylene glycol is also an important monomer to make excellent new polyester fiber poly Terephthalic acid dimethyl ester (PTT). Compared to PET ( polyethylene terephthalate), PBT (commonly known as Dacron polyester, chemical name is polyethylene terephthalate dimethyl ester ) fiber, PTT fiber has better performance. It has both high performance of PET and ease processing of PBT. Compared with conventional PET polyester fiber, such fiber of it's soft parts is propylene glycol rather than ethylene glycol. Therefore, it's soft parts of carbon-carbon chain is long, which makes the fiber itself is elastic and soft.
In the pharmaceutical industry, as its very nature basically identical to the glycerol, but viscosity, toxicity and irritation are smaller than glycerol, and good solubility, so it used to dissolve many drugs such as sulfa drugs, local anesthetics, sex hormones, vitamin d, vitamin a, chloramphenicol, and many essential oils. OKCHEM blog updates knowledge and information about chemicals and precise datas of China chemicals, if you have interest, please follow us on linkedin or visit OKCHEM.COM.