| 摘要 |
PURPOSE: Provided is a method for purifying an epoxy resin, which can substantially decrease a hydrolyzable chlorine component and provide a epoxy resin in high yield, without the increase of epoxy equivalent. CONSTITUTION: The method comprises the steps of (i) dissolving 100 parts by weight of epoxy resin into 100-300 parts by weight of hydrophobic, organic solvent, adding 5-40 parts by weight of aprotic polar solvent and 0.001-4.0 parts by weight of phase-transition catalyst which is quaternary ammonium salt or quaternary phosphonium salt, to the solution, and then adding 1-10 equivalent of aqueous alkali metal hydroxide solution based on 1 equivalent of hydrolyzable chlorine contained in the epoxy resin, to the solution to purify the epoxy resin at 40-90 deg.C for 30-180 minutes, and (ii) washing the purified product with water, filtering the product, and then recovering the hydrophobic organic solvent.
|
