1. Polyethylene glycol with low relative molecular weight (Mr<2000) is suitable for use as a wetting agent and consistency regulator for creams, lotions, toothpastes, shaving creams, etc., and also Suitable for non-rinsing hair care products to give hair a silky shine.
2. Polyethylene glycol (Mr>2000) with high relative molecular weight is suitable for lipstick, deodorant stick, soap, shaving soap, foundation and beauty cosmetics, etc.
3. In cleaning agents, polyethylene glycol is also used as a suspending agent and thickening agent.
4. In the pharmaceutical industry, it is used as the base of ointments, emulsions, ointments, lotions and suppositories.
5. Polyethylene glycol is widely used in a variety of pharmaceutical preparations, such as injections, topical preparations, ophthalmic preparations, oral and rectal preparations.
6. Solid-level polyethylene glycol can be added to liquid polyethylene glycol to adjust the viscosity and used for topical ointments; polyethylene glycol mixtures can be used as suppository bases; polyethylene glycol aqueous solutions can be used Used as a suspending agent or used to adjust the viscosity of other suspension media; polyethylene glycol is used in combination with other emulsifiers to increase the stability of the emulsion.
7. Polyethylene glycol is also used as a film coating agent, tablet lubricant, controlled release material, etc.
Extended information:
Due to the influence of chain length, polyethylene glycols of different molecular weights often have different physical properties (such as viscosity) and different applications, but most polyethylene glycols Ethylene glycol chemical properties are similar. Low molecular weight polyethylene glycol usually refers to a purer oligomer, which is more monodisperse; high-purity polyethylene glycol is crystalline, so its crystal structure can be determined by X-ray. Because purification and isolation of oligomeric polyethylene glycol is more difficult, the price is usually 10-1000 times that of polydisperse polyethylene glycol.
Those with a relative molecular mass between 700-900 are semi-solid. Those with a relative molecular mass of 1000 and above are light white waxy solids or flake-like paraffin wax or fluid powder. Miscible in water, soluble in many organic solvents, such as alcohols, ketones, chloroform, glycerides and aromatic hydrocarbons, etc., insoluble in ether and n-hexane.
The product combined with hydrophobic molecules can be used as a nonionic surfactant. As the molecular weight increases, its water solubility, vapor pressure, water absorption and solubility in organic solvents decrease accordingly, while the freezing point, relative density, flash point and viscosity increase accordingly. It is heat stable, inert to many chemicals and does not hydrolyze.
Baidu Encyclopedia Polyethylene glycol