Preparation method of polyester resin for epoxy hybrid powder coating

A technology of polyester resin and epoxy resin, which is applied in the direction of powder coating, epoxy resin coating, polyester coating, etc., can solve problems such as unexisting, and achieve the effects of reducing production, excellent leveling, and reducing pollution

Inactive Publication Date: 2013-09-18
江苏宝田新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using PET polyester waste to produce saturated acid-based epoxy hybrid polyester resin for powder coatings, there is no systematic and comprehensive method and process

Method used

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  • Preparation method of polyester resin for epoxy hybrid powder coating
  • Preparation method of polyester resin for epoxy hybrid powder coating
  • Preparation method of polyester resin for epoxy hybrid powder coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The polyester resin obtained in Example 1 can meet the standard general formulations of various properties of powder coatings. The present invention uses PET polyester waste to synthesize various comprehensive properties of polyester resins and use this formulation as a reference for comparison.

[0038] According to the formula requirements of Example 1 in Table 1, in a 1500-liter reactor equipped with an agitator and a precision fractionation column, the esterification catalyst dibutyltin oxide, neopentyl glycol, diethylene glycol, and trimethylol were added successively. propane and ethylene glycol, heat up to 100°C and keep the stirrer running at a speed of 1r to 50r / min, then add terephthalic acid, adipic acid, and triphenyl phosphite in sequence, protect with nitrogen, and continue the temperature rise reaction , 180°C±5°C began to generate esterification water, and the system was separated in time. The temperature at the top of the process tower was controlled to ...

Embodiment 2

[0040] Use PET bottle flakes for short fiber or long fiber as raw material, after washing and removing impurities, crush it to 10mm~40mm for later use;

[0041]The injection temperature of neopentyl glycol is around the boiling point of neopentyl glycol at 190°C to 220°C. After preheating, the neopentyl glycol is injected by a high temperature resistant pump with pressure at a pressure of 0.1Mpa to 10Mpa. The injection of high-pressure neopentyl glycol vapor and liquid is used to resist the high-resistance pressure generated during the extrusion process. The speed is 1000Kg per hour. The total residence time of the material in the twin-screw is 1-30min, and the screw speed is 5r ~30r / min.

[0042] Under the above conditions, PET gets a rapid alcohol degradation reaction. The neopentyl glycol injected through the screw at high temperature is 30.00Kg, and the mixed melt that has undergone preliminary alcohol degradation is extruded at a speed of 1000Kg per hour. In the 1500-lit...

Embodiment 3

[0046] Use short fiber or long fiber PET bottle flakes as raw materials, and crush the washed and impurity-removed PET raw materials to 10mm-40mm for later use;

[0047] The injection temperature of 2-methyl-1,3-propanediol is around the boiling point of 2-methyl-1,3-propanediol, 210℃~214℃. After preheating 2-methyl-1,3-propanediol, a high temperature resistant pump is used Inject with pressure, the pressure is 0.1Mpa ~ 10Mpa. High-pressure 2-methyl-1,3-propanediol vapor-liquid injection is used to resist the high resistance pressure generated during the extrusion process. The speed of extrusion is 1000Kg per hour, and the total residence time of the material in the twin-screw is 1-30min. , The screw speed is 5r ~ 30r / min.

[0048] Under the above conditions, PET gets a rapid alcohol degradation reaction. The 2-methyl-1,3-propanediol injected through the screw at high temperature is 30.00Kg, and the mixed melt that has undergone preliminary alcohol degradation is extruded at ...

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Abstract

The invention discloses a preparation method of polyester resin. The preparation method comprises the following steps of: (1) melting and mixing PET (Polyethylene Terephthalate) raw materials and dihydric alcohol to obtain a molten mixture, then adding the molten mixture into the molten dihydric alcohol, and carrying out ester exchange reaction in the existence of an ester exchange catalyst; and (2) adding polyhydric alcohol, polyatomic acid/acid anhydride and a stabilizer, carrying out esterification reaction under the action of an esterification catalyst, and then, adding trimellitic anhydride and octadecyl/hexadecyl tertiary amine to react while stirring to obtain the polyester resin. The polyester resin obtained according to the technical scheme disclosed by the invention not only has the characteristics of specific xanthochroia resistance, roasting resistance, salt mist resistance and the like of a powder coating produced through synthesizing high-quality polyester resin, but also has better luster and impact resistance and favorable leveling property, and can be used for reducing the generation of polyester wastes and environment pollution caused by esterified water generated by synthesizing purified terephthalic acid so as to be an environment-friendly technical scheme.

Description

technical field [0001] The invention relates to a preparation method of a polyester resin, in particular to a method for preparing a polyester resin which can be used for producing epoxy mixed powder coatings by using recycled PET material polyester. Background technique [0002] Polyester made of PET is a general-purpose polymer material widely used in many fields, mainly used in textiles and fibers, packaging films and packaging bottles. At present, the annual output of polyester in my country is about 40 million tons, and a large amount of polyester waste is produced every year. [0003] In order to ensure sustainable development and full utilization of materials and reduce environmental pollution, the recycling and reuse of waste PET polyester has attracted increasing attention from all over the world in recent years. [0004] At present, most of the waste PET material polyester (hereinafter referred to as waste PET) methods used at home and abroad focus on direct physi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/20C08G63/85C09D167/02C09D163/00C09D5/03
Inventor 蒋云
Owner 江苏宝田新材料股份有限公司
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