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Polyethylene glycol monomethyl ether is a derivative of polyethylene glycol. It is soluble in water, ethanol and most highly polar organic solvents. It is less volatile than glycerin, has stable chemical properties, is not easy to be destroyed by hydrolysis, and has strong hydrophilicity. . Low vapor pressure, stable to heat, used as thickener and lubricant in textile printing and dyeing industry and daily chemical industry. In the building materials industry, it is used as a raw material for cement water reducing agent and reinforcing agent. The polycarboxylic acid high-efficiency water-reducing agent synthesized by using this raw material has strong cement particle dispersion retention ability, so that the product has low dosage, high water reduction rate, good reinforcement effect, durability, non-corrosive steel bar and environmentally friendly Etc. It can be applied to high-performance, high-strength (above C60) commercial concrete for on-site mixing and long-distance transportation.