Method for preparing triethylene glycol dimethacrylate

Abstract

The invention discloses a method for preparing triethylene glycol dimethacrylate, which comprises the following steps of: (1) putting main materials of triethylene glycol and methacrylic acid into an esterification reaction container, adding a solvent, adding a catalyst and a polymerization inhibitor A, and performing mixing reaction to obtain a reaction material; (2) controlling the pressure in the esterification reaction container to be -0.04 to -0.08MPa, raising the temperature in the esterification reaction container until reflux flows out, keeping the temperature, and beginning cooling to normal temperature until no reflux flows out or an acid value in reaction solution is detected to be 3-5mgKOH / g; (3) transferring the reaction material to a washing container, adding alkali liquor, controlling the pH value of the reaction material to be 7-8, standing until the reaction material is layered, and discharging wastewater on the lower layer; and (4) transferring the reaction material of which the wastewater is removed to a distillation container, adding a polymerization inhibitor B, vacuumizing the distillation container, and distilling to remove methylbenzene to obtain the product. The product is high in purity, good in color, and high in yield.

Description

Technical field [0001] The invention relates to a synthesis and preparation technology of chemical products, in particular to a preparation method of triethylene glycol dimethacrylate. Triethylene glycol dimethacrylate is suitable for radiation curing reactive dilution. agent. Background technique [0002] At present, the preparation and production technology of triethylene glycol dimethacrylate adopts the normal pressure esterification method. The reaction process can easily cause material polymerization. The product color is dark, and the color number is usually greater than No. 70. The product yield is low, and the product yield is low. The rate is generally less than 70%, which cannot meet the needs of preparing and producing high-quality products. Contents of the invention [0003] In order to solve the technical problems existing in the known technology, the present invention provides a preparation method of triethylene glycol dimethacrylate. This method can reduce ...

AI Technical Summary

Problems solved by technology

[0002] At present, the preparation and production technology of triethylene glycol dimethacrylate adopts the method of normal pressure esterification, the reaction process is easy to cause material polymerization, the product color is dark, the color number is usually greater than No. 70, the product yield is low, and the product yield is low. The rate is generally lower than 70%, which cannot meet the needs of preparing and producing high-quality products

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