Dehydration process used in alkyd or polyester resin synthesis

Abstract

The invention provides a dehydration process applied to the synthesis of alkyd or polyester resin. The dehydration process comprises a dehydration step. According to the dehydration step, monomers foresterification are mixed with a dehydrating agent so as to obtain an esterification product and a dehydrating agent-water azeotrope; the mass of the dehydrating agent accounts for 3 to 6% of the massof the monomers; and the dehydrating agent comprises methyl isobutyl ketone. The dehydration process of the invention utilizes the dehydrating agent containing methyl isobutyl ketone to remove waterproduced in esterification and does not affect the synthesis of the alkyd or polyester resin; and the residual amount of the dehydrating agent in the alkyd or polyester resin is low, as low as no morethan 0.03%.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, in particular to a dehydration process applied in the synthesis of alkyd or polyester resin. Background technique [0002] The synthesis of alkyd resin and polyester is an esterification reaction, which will generate part of water. If the reaction is to continue, the water must be removed to further complete the esterification. There are two preparation methods, the first melting method and the second solvent method. The melting method has a large material loss and has been basically eliminated. At present, the main preparation method is the solvent method, which has a small material loss and ensures the stability and accuracy of the formula to a higher degree. However, since xylene is used as the dehydration solvent at present, there will be xylene residue after the synthesis, the finished resin product has a strong smell, and the residue of benzene series will cause harm to the human...

AI Technical Summary

Problems solved by technology

There are two preparation methods, the first melting method and the second solvent method. The melting method has a large material loss and has been basically eliminated. At present, the main preparation method is the solvent method, which has a small material loss and ensures the stability and accuracy of the formula to a higher degree. However, since xylene is currently used as the dehydration solvent, there will be xylene residue after the synthesis, the finished resin product has a strong smell, and the residue of benzene series will cause harm to the human body and the environment