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Water-spot-resistant and whitening-resistant polyester resin as well as preparation method and application thereof

A polyester resin, anti-whitening technology, applied in polyester coatings, coatings, powder coatings, etc., can solve the problems of regional whitening, easy yellowing, and reduction to less than 10%

Active Publication Date: 2022-03-11
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with TGIC, HAA still has certain defects in performance, such as easy yellowing, poor water boiling resistance, etc., especially in black, brown and other dark powder coating systems
[0003] Existing carboxyl-terminated polyesters are usually produced by a two-step synthesis process, and the molecular chain ends have a certain amount of hydroxyl groups. The existence of hydroxyl groups will have a certain impact on the water-boiling performance. Most of the gloss retention rate will drop to less than 10% after being boiled for 2 hours, and there will be a lot of water spots, serious whitening of the area, and large color difference

Method used

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  • Water-spot-resistant and whitening-resistant polyester resin as well as preparation method and application thereof
  • Water-spot-resistant and whitening-resistant polyester resin as well as preparation method and application thereof
  • Water-spot-resistant and whitening-resistant polyester resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A water-spot and anti-whitening polyester resin, its raw material components and their quality are shown in Table 1.

[0044] The preparation method of the water spot-resistant and anti-whitening polyester resin is as follows: according to Table 1, put the formula amount of dihydric alcohol and trihydric alcohol into the reaction kettle, heat to 120°C to melt, start stirring, and then add the formula amount of dibasic acid , esterification catalyst, heat up to 240°C and maintain the reaction until the acid value is 8.9mgKOH / g; cool down to 228°C, put in a formula amount of end-capping agent, raise the temperature to 240°C, and maintain the acid value to 38.8mgKOH / g; Vacuumize for 2 hours at 0.1MPa and 232°C to obtain a carboxyl-terminated polymer with an acid value of 27.7mgKOH / g, a viscosity of 4150mPa·s, and a hydroxyl value of 8.9mgKOH / g; then cool down to 204°C and put in a secondary end-capping agent , after maintaining for 60min, vacuumize for 2h under the conditi...

Embodiment 2

[0050] A water-spot and anti-whitening polyester resin, its raw material components and their quality are shown in Table 1.

[0051] The preparation method of the water-spot-resistant and anti-whitening polyester resin is as follows: according to Table 1, put the formula amount of dihydric alcohol and trihydric alcohol into the reaction kettle, heat to 130°C to melt, start stirring, and then add dibasic acid, ester Catalyst, heat up to 242°C to maintain the reaction until the acid value is 10.1mgKOH / g; cool down to 224°C, put in a capping agent once, raise the temperature to 243°C, and maintain the acid value to 39.8mgKOH / g; at -0.1MPa, 231 Vacuum at ℃ for 3 hours to obtain a carboxyl-terminated polymer with an acid value of 28.5 mgKOH / g, a viscosity of 4550 mPa·s, and a hydroxyl value of 7.2 mgKOH / g; then lower the temperature to 210 °C and put in a secondary end-capping agent for 52 minutes , evacuated for 1.5h under the condition of -0.1MPa, and finally put in the antioxida...

Embodiment 3

[0057] A water-spot and anti-whitening polyester resin, its raw material components and their quality are shown in Table 1.

[0058] The preparation method of the water-spot-resistant and anti-whitening polyester resin is as follows: according to Table 1, diols and triols are put into a reaction kettle, heated to 140° C. to melt, and the stirring is started, and then a dibasic acid and an esterification catalyst are added. Raise the temperature to 244°C to maintain the reaction until the acid value is 11.3mgKOH / g; cool down to 222°C, put in a capping agent once, raise the temperature to 245°C, and maintain the acid value to 41.0mgKOH / g; at -0.1MPa, 234°C Vacuumize for 2 hours to obtain a carboxyl-terminated polymer with an acid value of 29.1 mgKOH / g, a viscosity of 5010 mPa·s, and a hydroxyl value of 6.1 mgKOH / g; then lower the temperature to 215°C and put in a secondary end-capping agent, and after maintaining for 44 minutes, - Vacuumize at 0.1MPa for 1.5h, and finally put in...

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Abstract

The invention provides water-spot-resistant and whitening-resistant polyester resin as well as a preparation method and application thereof. The water-spot-resistant and whitening-resistant polyester resin is prepared from the following raw materials: 4.0 to 4.5 parts of dihydric alcohol, 0.02 to 0.1 part of trihydric alcohol, 5.7 to 6.2 parts of dibasic acid, 0.008 to 0.012 part of esterification catalyst, 0.9 to 1.4 parts of primary end-capping reagent, 0.1 to 0.3 part of secondary end-capping reagent and 0.02 to 0.1 part of antioxidant. According to the invention, secondary end capping and secondary vacuum processes are adopted, the hydroxyl content is reduced to be within 3mgKOH / g, the prepared polyester resin is applied to powder coating, no water spot exists after a dark coating is boiled in water for 2 hours, and the gloss retention rate is greater than 70%; the coating is detected by adopting an anti-whitening performance detection method, the gloss retention rate is greater than 88%, the color difference change is less than 1.5, and the coating has excellent water spot resistance and whitening resistance.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-spot and anti-whitening polyester resin and a preparation method and application thereof. Background technique [0002] Outdoor pure polyester powder coatings can be divided into two categories: triglycidyl isocyanurate (TGIC) and hydroxyalkylamide (HAA). The coating surface prepared by TGIC powder coatings is clear and has good performance, but there are toxicity and environmental protection problems in the synthesis, post-treatment and production and construction of powder coatings. HAA is a curing agent with less toxicity than TGIC. In recent years, due to the restriction of the use of TGIC, the usage of HAA has continued to increase. However, compared with TGIC, HAA still has certain defects in performance, such as easy yellowing, poor water boiling resistance, etc., especially in black, brown and other dark powder coating systems. [0003] Existing car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/52C09D167/02C09D167/07C09D5/03C09D7/61C09D7/63
CPCC08G63/20C08G63/52C09D167/02C09D167/07C09D5/033C08K2003/3045C08K3/30C08K5/20Y02E10/50
Inventor 翟春海冯跃华周韦明焦金牛郭可可
Owner ANHUI SHENJIAN NEW MATERIALS
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