Propylene glycol is mainly used as a humectant, solvent, and solubilizer in skin care products. Propylene glycol has two chemical structures, namely 1,2-propanediol and 1,3-propanediol.
1,2-Propanediol is mainly prepared by propylene oxide hydration method, or by glycerol hydrogenolysis or bioengineering method. It is a colorless, viscous and stable liquid, almost odorless.
1,2-Propanediol is mainly used as a humectant in cosmetics, toothpastes and soaps with glycerin or sorbitol.
What we call propylene glycol mainly refers to 1,2-propanediol.
1,3-Propanediol is mainly prepared by acrolein hydrogenation hydration method in industry. It is a colorless, odorless, salty, hygroscopic, viscous liquid under normal conditions, and is almost non-toxic.
1,3-Propanediol is used as a humectant, thickener and solvent in cosmetics. This ingredient is safe and gentle, and will not cause skin irritation or discomfort. 1,3-propanediol can also be used as an intermediate in drug synthesis.
In addition to propylene glycol, many other glycols also have 1,2- and 1,3-two structures, such as butanediol. Generally speaking, the former structure is more used as a humectant, and the latter structure is more used as a solvent.
Post time: Nov-11-2020