The invention discloses a method for producing p-benzenoid
unsaturated polyester resin. The method for producing the p-benzenoid
unsaturated polyester resin comprises the following steps: (1) adding
terephthalic acid pool material, dihydric
alcohol or polyhydric
alcohol and an organic
tin or organic
zinc catalyst into a reaction kettle in proportion, and carrying out reaction at the temperature of 190-210 DEG C; (2) cooling until temperature is lower than 160 DEG C, adding unsaturated
binary acid and / or binary
alcohol into the
system in another matching ratio, heating up to 200-205 DEG C, and carrying out reaction; (3) vacuumizing until
acid value is reduced to be less than 30mgKOH / g, gradually cooling to 180-190 DEG C, and adding a
polymerization inhibitor; (4) cooling until the temperature is lower than 130 DEG C, adding phenylethylene, controlling the temperature to be 70-90 DEG C, and stirring for 1 hour; (5) after reaction is finished, pumping phenylehtylene into a
dilution kettle and adding auxiliaries like
copper naphthenate, pressing
polyester into the
dilution kettle, and stirring after material
settling is finished. The method for producing the p-benzenoid
unsaturated polyester resin has the advantages that utilization efficiency of raw materials is improved, production cost of unsaturated
polyester resin is reduced, environmental
pollution is reduced,
reaction speed is increased, and colour of the p-benzenoid unsaturated
polyester resin product is improved; the unsaturated
polyester resin obtained through reaction has good
heat resistance,
corrosion resistance and
solvent resistance.