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Low-temperature setting polyester resin

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

Active Publication Date: 2015-01-14
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A low-temperature curing polyester resin, its raw material components and their quality are shown in Table 1.

[0022] Preparation of polyester resin:

[0023] (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;

[0024] (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;

[0025] (3) Vacuum stage: At 210°C, vacuumize for 3 hours at a vacuum degree o...

Embodiment 2

[0028] A low-temperature curing polyester resin, its raw material components and their quality are shown in Table 1.

[0029] Preparation of polyester resin:

[0030] (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;

[0031] (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;

[0032] (3) Vacuum stage: U...

Embodiment 3

[0035] A low-temperature curing polyester resin, its raw material components and their quality are shown in Table 1.

[0036] Preparation of polyester resin:

[0037] (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;

[0038] (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;

[0039] (3) Vacuum stage: Under the condition of 205°C, vacuumize for 3.5...

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Abstract

The invention relates to low-temperature setting polyester resin. The low-temperature setting polyester resin comprises the following components in parts by mass: 7-9 parts of alcohol, 14-15 parts of acid, 0.02 part of an esterification catalyst and 0.2-0.3 part of curing catalyst. The prepared low-temperature setting polyester resin has the advantages that reaction activity is greatly improved, and storage stability is good; meanwhile, low-temperature setting is realized when the prepared low-temperature setting polyester resin is applied to powder coating, adhesive force of a coating to a base material is good, and good levelling property and chemical resistance are realized.

Description

technical field [0001] The invention belongs to the technical field of organic coatings, and in particular relates to a 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 for low-temperature c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/672C08G63/183C09D167/02C09D5/03
Inventor 刘志坚吴德清翟春海
Owner ANHUI SHENJIAN NEW MATERIALS
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