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Method for preparing low-temperature cured polyester resin

A polyester resin, low-temperature technology, applied in the field of preparation of low-temperature curing polyester resin, can solve the problems of insufficient leveling, high reactivity, insufficient reactivity, etc., achieve good leveling and chemical resistance, and good storage stability , Improve the effect of reactivity

Inactive Publication Date: 2015-03-04
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing powder coating system mainly has the following problems when it is used for low-temperature curing. On the one hand, the system has insufficient reactivity, the powder coating cannot be completely cured, and the coating performance is not ideal; on the other hand, the flatness of the coating is poor, which is mainly Due to the reactivity required for low temperature curing, polyester resins often have high melt viscosity, high reactivity, and insufficient leveling at low temperatures
These have greatly affected the decorative properties of powder coatings

Method used

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  • Method for preparing low-temperature cured polyester resin
  • Method for preparing low-temperature cured polyester resin
  • Method for preparing low-temperature cured polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of polyester resin, the steps are as follows:

[0022] (1) Heating stage: raise the temperature of the reaction kettle to 110°C, start stirring, and put in the formulated amount of alcohol, acid, and formulated amount of esterification catalyst in sequence. Raise the temperature to 215°C at a heating rate of 2°C / 15min, and finally raise the temperature to 247°C at a heating rate of 2°C / 15min, maintain the reaction until the top temperature of the reactor drops below 70°C, and take a sample to detect an acid value of 9.3mgKOH / g;

[0023] (2) Cooling stage: lower the temperature of the kettle to 185°C, put in acid, and then raise the temperature to 220°C for maintenance. After the top temperature of the reaction kettle drops below 60°C, take a sample to detect an acid value of 83.4mgKOH / g;

[0024] (3) Vacuum stage: At 210°C, vacuumize for 3 hours at a vacuum degree of -0.094MPa, take a sample to detect an acid value of 71.5mgKOH / g and a viscosity of ...

Embodiment 2

[0028] A preparation method of polyester resin, the steps are as follows:

[0029] (1) Heating stage: raise the temperature of the reaction kettle to 98°C, start stirring, and put in the formulated amount of alcohol, acid, and formulated amount of esterification catalyst in sequence, seal the kettle and raise the temperature to 179°C, Raise the temperature to 210°C at a heating rate of 1°C / 15min, and finally raise the temperature to 248°C at a heating rate of 1°C / 15min, maintain the reaction until the top temperature of the reactor drops below 70°C, and take a sample to detect an acid value of 7.9mgKOH / g;

[0030] (2) Cooling stage: lower the temperature of the kettle to 190°C, put in acid, and then raise the temperature to 230°C for maintenance. After the top temperature of the reaction kettle drops below 60°C, take a sample to detect an acid value of 82.6mgKOH / g;

[0031] (3) Vacuum stage: Under the condition of 220°C, vacuumize at a vacuum degree of -0.098MPa for 2.5h, take...

Embodiment 3

[0035] A preparation method of polyester resin, the steps are as follows:

[0036] (1) Heating stage: raise the temperature of the reaction kettle to 105°C, start stirring, and put in the formulated amount of alcohol, acid and the formulated amount of esterification catalyst in sequence. Raise the temperature to 220°C at a heating rate of 3°C / 15min, and finally raise the temperature to 246°C at a heating rate of 3°C / 15min, maintain the reaction until the top temperature of the reactor drops below 70°C, and take a sample to detect the acid value of 7.5mgKOH / g;

[0037] (2) Cooling stage: lower the temperature of the kettle to 180°C, put in acid, and then raise the temperature to 225°C for maintenance. After the top temperature of the reaction kettle drops below 60°C, take a sample to detect the acid value of 83.1mgKOH / g;

[0038] (3) Vacuum stage: Under the condition of 205°C, vacuumize for 3.5h at a vacuum degree of -0.094~-0.098MPa, take a sample to detect an acid value of 71...

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Abstract

The invention relates to a method for preparing low-temperature cured polyester resin. The method comprises the following steps: heating for esterifying, cooling, vacuumizing and curing. By adopting the method provided by the invention, the reaction activity of the resin is greatly improved, the storage stability is relatively good, and when the resin is used in a powder coating, low-temperature curing is well achieved, the coating is relatively good in adhesion to a substrate, and meanwhile relatively good leveling and chemical resistance properties are achieved.

Description

technical field [0001] The invention belongs to the technical field of organic coatings, and in particular relates to a preparation method of low-temperature curing polyester resin. Background technique [0002] Powder coatings have developed rapidly in recent years. Compared with traditional liquid coatings, powder coatings have the characteristics of energy saving, environmental protection and excellent comprehensive performance. With the strengthening of energy-saving and environmental protection concepts, it is a development trend to develop low-temperature curing polyester resins. In addition, some heat-sensitive substrates (such as medium density fiberboard) are sensitive to temperature and require low-temperature curing. Reducing the curing temperature will inevitably require the resin to have high reactivity, and high reactivity will have a certain impact on the coating performance. The existing powder coating system mainly has the following problems when it is used...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08G63/20C08G63/78C09D167/02C09D5/03
Inventor 刘志坚吴德清翟春海
Owner ANHUI SHENJIAN NEW MATERIALS
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