Pentaerythritol tetraacrylate preparation method

The present invention discloses a pentaerythritol tetraacrylate preparation method, and belongs to the technical field of esterification product preparation. The method comprises: adding pentaerythrotol, acrylic acid, a solvent, a catalyst and a first polymerization inhibitor to a reactor; carrying out a reflux reaction of the reaction system at a preset temperature, and stopping the reaction when tracking a molar ratio of the pentaerythritol triacrylate to pentaerythritol tetraacrylate at 1:3-10; after cooling the reaction system, carrying out waster washing and alkali washing, and taking a first organic phase; washing the first organic phase with a reducing agent, carrying out water washing until achieving a neutral state, and taking a second organic phase; and adding a second polymerization inhibitor to the second organic phase, and carrying out pressure reducing distillation and filtering to obtain the pentaerythritol tetraacrylate. According to the present invention, the reducing agent reacting with the oxidized polymerization inhibitor is adopted as the decoloration agent to prepare the pentaerythritol tetraacrylate with characteristics of low hydroxyl value and low chrominance; and the method of the present invention is simple, is easy to control, and is suitable for scale industrial production.