Method for preparing ditrimethylolpropane tetraacrylate

Abstract

The invention discloses a method for preparing ditrimethylolpropane tetraacrylate. The method comprises the following steps of: (1) putting ditrimethylolpropane and acrylic acid serving as main materials into an esterification reaction container, adding a solvent, a catalyst and a polymerization inhibitor A, and performing stirring reaction to obtain a reaction material; (2) controlling the pressure in the esterification reaction container at -0.04 to -0.08MPa, raising the temperature in the esterification reaction container till reflux liquid flows out, preserving the heat, and starting cooling to normal temperature when no reflux liquid flows out or the detected acid value in a reaction solution is 30 to 50mgKOH / g; (3) transferring the reaction material into a washing container, adding alkali liquor, controlling the pH value of the reaction material at 7 to 8, standing, and discharging the wastewater of the lower layer after the reaction material is demixed; and (4) transferring the wastewater-removed reaction material to a distillation container, adding a polymerization inhibitor B, vacuumizing the distillation container, and removing methylbenzene by distillation to obtain the product. The product prepared by adopting the method disclosed by the invention has high purity, good color and high yield.

Description

technical field [0001] The invention relates to a synthesis and preparation technology of chemical products, in particular to a preparation method of ditrimethylolpropane tetraacrylate, which is suitable for use as a radiation curing reactive diluent. Background technique [0002] At present, the preparation and production technology of ditrimethylolpropane tetraacrylate 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 70, the product yield is low, and the product yield is average Less than 70%, can not meet the needs of preparing and producing high-quality products. Contents of the invention [0003] The invention provides a method for preparing ditrimethylolpropane tetraacrylate to solve the technical problems in the known technology. The method can reduce the generation of polymers, and the product has light color, high quality and high ...

AI Technical Summary

Problems solved by technology

[0002] At present, the preparation and production technology of ditrimethylolpropane tetraacrylate 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 70, the product yield is low, and the product yield is average Less than 70%, cannot meet the needs of preparing and producing high-quality products

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