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Method for producing p-benzenoid unsaturated polyester resin

A polyester resin and unsaturated technology, which is applied in the field of producing p-benzene type unsaturated polyester resin to achieve the effects of improving color, good heat resistance and improving utilization efficiency

Inactive Publication Date: 2014-07-30
WUQIAO HAOTONG RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for producing p-phenylene type unsaturated polyester resin, which uses the pool material or drying material produced in the production process of purified terephthalic acid as part of the raw material to synthesize heat-resistant and corrosion-resistant p-phenylene type unsaturated polyester resin. Saturated polyester resin realizes the utilization of resources and solves the problem of environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use a one-liter four-mouth ground flask as a reaction kettle, install a thermometer, a stirrer, a nitrogen inlet pipe and a fractionation device respectively, and put in 40g of propylene glycol, 45g of glycol, 180g of diethylene glycol, and 225g of terephthalate in sequence. Formic acid pool material (wherein the moisture content is 20%), and add 0.4g zinc acetate catalyst. When the temperature of the reactant is 130-140°C, water begins to distill out. Continue to raise the temperature and control the temperature of the fractionation column to be lower than 105°C until the acid value is lower than 8mKOH / g. Lower the material below 160°C and add 160g of maleic anhydride, gradually increase the temperature and control the temperature of the fractionation column to be lower than 105°C, when the acid value reaches below 60mgKOH / g, start vacuuming to force the water to evaporate until the acid value reaches below 30mgKOH / g and stop Vacuum. Cool down to 180°C and add 0.1g of...

Embodiment 2

[0026] The reaction device is the same as Example 1. With 40g propylene glycol, 107g ethylene glycol, 185g diethylene glycol and 8g pentaerythritol, 250g terephthalic acid drying pool material (total acid content > 98%), 0.25g monobutyl tin oxide catalyst drops in the reaction unit, when When the acid value is lower than 8mgKOH / g, lower the temperature and drop into the second-step material fumaric acid 275g, hydroquinone 0.1g, styrene 375g, and operate in the same operation steps as in Example 1.

Embodiment 3

[0028] 27g ethylene glycol, 135g diethylene glycol, 135g resin alcohol, 177g terephthalic acid drying material, 0.3g composite catalyst (comprising 0.2g zinc acetate and 0.1g monobutyltin oxide) are dropped into example 1 In the described device, in subsequent steps, fumaric dianhydride was changed to 235g, hydroquinone was changed to 0.10g, styrene was changed to 300g, and the same operation steps were operated as in Example 1.

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Abstract

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.

Description

technical field [0001] The invention belongs to the field of chemical product production, in particular to a method for producing p-phenylene unsaturated polyester resin. Background technique [0002] Unsaturated polyester resins have shown excellent performance in various fields of composite materials, and are constantly replacing some metals and alloy materials to prepare various storage tanks, fiberglass pipes, furniture and other indoor and outdoor products and handicrafts that are widely used and artificial stone etc. At present, the main raw materials used in the production of unsaturated polyester resins are phthalic anhydride, isophthalic acid, maleic anhydride, fumaric acid, etc. With the gradual improvement of environmental protection and energy saving requirements, more and more attention has been paid to the effective use of waste materials in chemical production processes and organic waste generated in daily life. Among them, a large amount of terephthalic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08F212/08C08G63/676C08G63/78
Inventor 刘冬霞武广文吴凤煊
Owner WUQIAO HAOTONG RESIN
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