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Preparation method of polyester resin used in outdoor weatherable powder paint

A powder coating and polyester resin technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as no method and process, and achieve the effects of reducing production process costs, excellent leveling, and reducing pollution

Inactive Publication Date: 2013-09-25
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 carboxylated polyester resin for outdoor weather-resistant powder coatings, there is no systematic and comprehensive method and process

Method used

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  • Preparation method of polyester resin used in outdoor weatherable powder paint
  • Preparation method of polyester resin used in outdoor weatherable powder paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The polyester resin obtained in Example 1 can meet the standard general formulations of various properties of weather-resistant 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.

[0039] According to the formula requirement of embodiment 1 in table 1, in the 1500 liters of reactors that are equipped with agitator and precision fractionation column, add esterification catalyst monobutyltin oxide, neopentyl glycol, trimethylol propane successively, be warming up to Keep the stirrer running at 100°C, with a rotation speed of 1r~50r / min, then add terephthalic acid, adipic acid, and triphenyl phosphite in sequence, protect with nitrogen, continue to heat up the reaction, and start to form esters at 180°C±5°C Melt water, separate the system in time, control the temperature at the top of the process tower to be stable within 105°C, further rai...

Embodiment 2

[0041] 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;

[0042]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.

[0043] Under the above conditions, PET gets a rapid alcohol degradation reaction. The neopentyl glycol injected through the screw at high temperature is 50.00Kg, 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

[0047] 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;

[0048] 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 of extrusion 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.

[0049] Under the above-mentioned conditions, PET obtains fast alcohol degradation reaction, and the addition of embodiment 3 PET is 628.75Kg, and the neopentyl glycol that injects by screw high temperature is 50.00Kg, the mixed melt that will be through initial alcoho...

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Abstract

The invention discloses a preparation method of polyester resin used in outdoor weatherable powder paint. The method comprises the steps that: (1) washed, impurity-removed, and crushed PET raw material is subjected to a trans-esterification reaction with dihydric alcohol with a boiling point higher than that of ethylene glycol under the existence of a trans-esterification catalyst; after the trans-esterification reaction is finished, polyol, polyacid / anhydride, and a stabilizer are added; an esterification reaction is carried out under the effect of an esterification catalyst; isophthalic acid and a curing accelerator triphenylphosphine are added, and a stirring reaction is carried out, such that the polyester resin used in outdoor weatherable powder paint is obtained. The polyester resin has the characteristics of outdoor weatherability, baking resistance, salt spray resistance, and the like of a powder paint synthesized and produced by using weatherable polyester resin, and has good gloss, impact resistance, and excellent leveling performance. The pollutions to the environment caused by polyester waste material and esterification water produced in purified terephthalic acid synthesis are reduced. Therefore, the technical scheme provided by the invention is environment-friendly.

Description

technical field [0001] The invention relates to a method for preparing polyester resin, in particular to a method for preparing polyester resin for outdoor weather-resistant powder coatings by using recycled PET materials. 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 are mostly concentrated on direct physical utiliz...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/183C09D167/02C09D5/03
Inventor 蒋云
Owner 江苏宝田新材料股份有限公司
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