Properties of polypropylene glycol
Colorless to pale yellow viscous liquid. Non-volatile. Non-corrosive. The molecular weight of general products is 400 ~ 2050. Lower molecular weight polymers are soluble in water. Higher molecular weight polymers are only slightly soluble in water, soluble in oils, many hydrocarbons, and aliphatic alcohols, ketones, esters, and the like. The hydroxyl groups at both ends of the molecule can be esterified to form mono- or di-esters. Its monoester is a non-ionic surfactant and can also interact with alcohols to form ethers. It is a solvent for vegetable oils, resins and paraffin waxes. It is also used in the preparation of alkyd resins, emulsifiers, demulsifiers, lubricants and plasticizers. It is obtained by the condensation of propylene oxide and propylene glycol in the presence of a high pressure or acid catalyst.