Poly(ethylene glycol)

Product Details

CasNo： 25322-68-3

MF： C2nH4n+2On+1

Appearance： white solid

Delivery Time： 15 days

Packing： 25kg/bag

Purity： 99%

• Physical and Chemical Properties: Properties vary with different relative molecular masses. PEG with a relative molecular mass of 200 - 600 is a color - less transparent liquid, and those with a relative molecular mass of more than 1000 are white or beige pastes or solids at room temperature, with a slight strange smell. Lower - molecular - weight PEG has strong hygroscopicity, and the hygroscopicity decreases rapidly as the relative molecular mass increases. The viscosity of its aqueous solution increases with the increase of molecular weight. The two terminal hydroxyl groups of the PEG molecular chain have reactive activity and can undergo esterification reaction and other reactions. It is generally very stable, but it can react with oxygen in the air at temperatures below 120℃.
• Main Specifications: Common types include PEG - 200, PEG - 400, PEG - 600, PEG - 1000, PEG - 4000, PEG - 8000, etc. The average relative molecular masses of different specifications are different. For example, the average relative molecular mass of PEG - 400 is 380 - 420, and that of PEG - 4000 is 3000 - 4800.
• Preparation Method: It is usually polymerized from ethylene oxide, and can also be obtained by the polymerization of ethylene glycol. The ring - opening polymerization of ethylene oxide is an ionic polymerization reaction, which can use acid or alkali as a catalyst, and alkali or coordination cation catalysts are commonly used. The polymerization initiator can be water, ethylene glycol, etc. Liquid - phase or gas - phase polymerization can be used, and the reaction is carried out at 150℃ - 180℃ and 0.3MPa - 0.4MPa. After the reaction, the product is obtained through neutralization, impurity removal and other steps.
• Application Fields
  • Pharmaceutical Industry: It is widely used as an ointment base and a carrier for active components, and is also used in the production of tablets and injections. Ointments based on PEG can treat skin diseases, etc., and it can also be used as a water - soluble suppository base. In addition, PEG - recombinant human growth hormone injection can be used to treat children with slow growth, and compound PEG electrolyte powder can be used for preoperative intestinal cleansing preparation.
  • Textile Industry: It can be used as an auxiliary for rayon, a component of sizing agents, and a solvent and dispersant for dyeing operations. Its fatty acid esters can be used in the formulation of chemical fiber finishing oils. It can also make fabrics soft, plasticized and finished, and help inhibit the accumulation of static electricity.
  • Daily Chemical Industry: It can be used as a non - volatile component of deodorants and flavoring agents, a fixative for flavors, a solubilizer for cosmetics, etc. It can also be used as a non - oil lubricant and a softener and antistatic agent in hair sprays, as well as an emulsifying auxiliary and plasticizer for soap making.
  • Other Fields: In the petrochemical industry, it can be used as a surfactant for mud; in the electrical industry, it can be used as a lubricant for electroplated components; in the rubber and plastic industry, it can be used to manufacture films and medical bandages, etc. It can also be used as a catalyst for chemical reactions, and as a pesticide carrier and solubilizer in agriculture.
• Packaging and Storage: It is usually packaged in plastic or iron barrels4. It should be stored in a cool, dry and well - ventilated warehouse, away from fire and heat sources, and avoid direct sunlight.