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A kind of preparation method and application of polyester resin applied to heat-sensitive substrate powder coating

A technology of powder coating and polyester resin, which is applied in the direction of powder coating, polyester coating, coating, etc. It can solve the problems of high melt viscosity of polyester resin, inability to provide a smooth coating film, and inability to fully flow, etc., to achieve good adhesion , coating appearance and chemical resistance, good hardness effect

Active Publication Date: 2016-03-09
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing powder coating system cannot provide a satisfactory level coating film. This is mainly due to the high melt viscosity of the polyester resin, especially at low temperature conditions, which cannot fully level the coating film. Powder coatings on heat-sensitive substrates are critical

Method used

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  • A kind of preparation method and application of polyester resin applied to heat-sensitive substrate powder coating
  • A kind of preparation method and application of polyester resin applied to heat-sensitive substrate powder coating
  • A kind of preparation method and application of polyester resin applied to heat-sensitive substrate powder coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of polyester resin:

[0024] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 110°C, wait until the alcohol is completely melted, stir at a speed of 130r / min, then put in the formula amount of acid and esterification catalyst, heat up to 170°C, at 5°C Raise the temperature to 245°C at a heating rate of / 30min, maintain the reaction until the reactant is clear, and take a sample to test the acid value of the sample;

[0025] The second stage: Add acid, maintain the temperature at 210°C until the reactants are clear, take samples to measure the acid value;

[0026] The third stage: under the condition of 200°C, vacuumize at -0.095MPa for 1.5h until the reaction is complete, take samples to measure the acid value and viscosity.

Embodiment 2

[0028] Preparation of polyester resin:

[0029] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 115°C, wait for the alcohol to completely melt, stir at a speed of 135r / min, then put the formula amount of acid and esterification catalyst, heat up to 172°C, Raise the temperature to 246°C at a heating rate of / 30min, maintain the reaction until the reactant is clear, and take a sample to test the acid value of the sample;

[0030] The second stage: Add acid, maintain the temperature at 212°C, until the reactants are clear, take samples to measure the acid value;

[0031] The third stage: under the condition of 202°C, vacuumize at -0.095MPa for 1.6h until the reaction is complete, take samples to measure the acid value and viscosity.

Embodiment 3

[0033] Preparation of polyester resin:

[0034] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 120°C, wait for the alcohol to completely melt, stir at a speed of 140r / min, then put the formula amount of acid and esterification catalyst, heat up to 175°C, Raise the temperature to 247°C at a heating rate of / 30min, maintain the reaction until the reactant is clear, and take a sample to test the acid value of the sample;

[0035] The second stage: Add acid, maintain the temperature at 215°C until the reactants are clear, take samples to measure the acid value;

[0036] The third stage: under the condition of 204°C, vacuumize at -0.096MPa for 1.8h until the reaction is complete, take samples to measure the acid value and viscosity.

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PUM

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Abstract

The invention discloses a preparation method of polyester resin applied to a thermo-sensitive base material powder coating. The preparation method includes three stages, wherein the first stage comprises the steps of: putting a formula amount of alcohol into a reaction kettle, heating, stirring after the alcohol is completely melted, then adding the formula amount of an acid and an esterification catalyst, heating to 170-180 degrees centigrade, then heating to 245-250 degrees centigrade, and maintaining the reaction until reactants are clear; the second stage comprises the steps of: adding the acid, keeping the temperature at 210-220 degrees centigrade until the reactants are clear, sampling and measuring acid value; the third stage comprises the steps of vacuumizing at a vacuum degree from -0.095 to -0.097 MPa for 1.5-2 hours, and measuring the acid value. The invention further discloses application of the polyester resin to the thermo-sensitive base material powder coating. Polyester prepared by the method disclosed by the invention has a good hardness and a good adhesive force to a base material, simultaneously a coating has a good appearance and good chemical resistance, the coating requirement of the thermo-sensitive base material is satisfied, and the smoothness requirement of the thermo-sensitive base material is satisfied as well.

Description

technical field [0001] The invention relates to a preparation method and application of a building material, in particular to a preparation method and application of a polyester resin applied to heat-sensitive substrate powder coatings, and belongs to the field of coating industry. Background technique [0002] Powder coatings are known for their high efficiency, excellent mechanical properties and zero VOC emissions. However, the current application of powder coatings is mainly concentrated in the field of metal substrates, and powder coatings applied to heat-sensitive substrates (such as engineered wood, medium density fiberboard) are limited, and heat-sensitive substrates are mostly used in harsh environments such as sunlight exposure and high temperature. , which requires the protective coatings coated on its surface to have weather resistance and excellent color stability. For powder coatings with heat-sensitive substrates, excellent film smoothness and film hardness, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78C08G63/672C08G63/20C09D167/02C09D5/03
Inventor 刘志坚吴德清杨兆攀焦金牛
Owner ANHUI SHENJIAN NEW MATERIALS