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[Chemical Knowledge]：Focusing on propylene glycol and polypropylene glycol: the difference between production and application

Read： 540 Time：16months ago Source：Transform the World with Simplicity

In the field of chemical industry, propylene glycol and polypropylene glycol are two common compounds, which have obvious differences in production and application. Propylene glycol (Propylene Glycol, referred to as PG) is a colorless, tasteless, non-toxic liquid, its chemical formula is C3H8O2; and polypropylene glycol (Polypropylene Glycol, referred to as PPG) is a polymer formed by the polymerization of several propylene glycol monomers.

From the production process, propylene glycol is a liquid product separated from the oil refining process, and is usually used to make solvents, lubricants, cosmetics, medicines and foods. Propylene glycol can also be prepared by hydrating propylene oxide. In contrast, the preparation of polypropylene glycol requires a polymerization reaction, generally a catalyst-initiated polyacroalkylation reaction, followed by continuous polymerization with a polymer to obtain polypropylene glycol.

propylene glycol and polypropylene glycol also differ in chemical structure. Propylene glycol is a low-molecular compound with a small molecular weight, consisting of two hydroxyl groups and a propyl group; while polypropylene glycol is a high-molecular compound, which is repeatedly connected by a number of propylene glycol monomers in a certain proportion. This difference in chemical structure determines the difference in properties and uses of propylene glycol and polypropylene glycol. In terms of physical properties of

, propylene glycol has low viscosity and high boiling point, good solubility and stability, and can be dissolved in many solvents; while polypropylene glycol has higher viscosity and high melting point, its solubility and stability are relatively poor, and it often needs to be used in conjunction with other solvents.

In the application, propylene glycol is mainly used as a solvent, lubricant and antifreeze, and its low toxicity and harmless properties make it widely used in the food and pharmaceutical industries. In addition, propylene glycol is also used in cosmetic manufacture because of its ability to absorb moisture and keep the skin moist. Polypropylene glycol is widely used in coatings, plastics, fibers, rubber and other fields. It has excellent thickening properties and can be used to improve the viscosity and rheological properties of products.

In summary, there are significant differences in the production and application of propylene glycol and polypropylene glycol. Propylene glycol is a low-molecular compound with a wide range of uses, while polypropylene glycol is a high-molecular compound with good thickening properties. When we use these two compounds, we should choose according to their characteristics and uses to achieve the best effect and application value.

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