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Preparation method for low temperature curing polyester resin with high leveling performance

A polyester resin and thermosetting technology, applied in the field of preparation of mixed polyester resin, can solve the problems of poor leveling performance, lower curing temperature and high viscosity of the board surface, and achieve the effect of good leveling and improving toughness.

Active Publication Date: 2012-04-18
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the reduction of the curing temperature, the resin is required to have a higher activity in order to complete the curing reaction, which will inevitably have a greater impact on the performance of the board surface.
At present, the low-temperature curing resins on the market generally have the disadvantages of high viscosity and poor surface leveling performance, which greatly affects the decorative performance of indoor powder coatings.

Method used

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  • Preparation method for low temperature curing polyester resin with high leveling performance
  • Preparation method for low temperature curing polyester resin with high leveling performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A. Synthesis process: In the synthesis kettle, the temperature of the kettle is raised to 90-100°C, and 5.57kg of neopentyl glycol, 1.2kg of ethylene glycol, 0.5kg of diethylene glycol, 12kg of purified terephthalic acid, Diacid 0.5kg and monobutyl tin oxide 22g. After feeding the materials, seal the kettle and heat it up, and at the same time, fill it with nitrogen for production protection. When the temperature rises to 245°C, keep the reaction for 2 hours. When the top temperature of the reaction kettle drops below 70°C, take samples for testing. The acid value is 18-22mgKOH / g ;

[0021] B. Vacuum pumping process: lower the temperature of the kettle to 230°C, carry out vacuum operation, the vacuum degree of the reactor is less than -0.090MPa, maintain this condition for 2 hours, and take a sample to detect the acid value at 6-9mgKOH / g;

[0022] C. Curing process: lower the temperature of the kettle to below 210°C, add 1.25kg of trimellitic anhydride, and maintain th...

Embodiment 2

[0025] A. Synthesis process: In the synthesis kettle, the temperature of the kettle is raised to 90-100°C, and 5.57kg of neopentyl glycol, 1.2kg of ethylene glycol, 0.5kg of diethylene glycol, 12kg of purified terephthalic acid, and Monobutyltin oxide 22g. After feeding the materials, seal the kettle and heat it up, and at the same time, fill it with nitrogen for production protection. When the temperature rises to 245°C, keep the reaction for 2 hours. When the top temperature of the reaction kettle drops below 70°C, take samples for testing. The acid value is 18-22mgKOH / g ;

[0026] B. Cooling process: lower the temperature of the kettle to below 210°C, put in 0.5kg of adipic acid and 0.95kg of trimellitic anhydride, then slowly raise the temperature to 220°C, the top temperature rises, and maintain the reaction at 220°C for 1.5 hours, until the top temperature drops to 70°C The following samples were taken for testing, and the acid value was 58-62mgKOH / g;

[0027] C. Vacuu...

Embodiment 3

[0030] Except that in C, vacuuming and curing process, the vacuum reaction time is 2.5 hours, and the viscosity is except that the viscosity is 0.3-0.4Pa.s, all the other are identical with embodiment 2.

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Abstract

The invention discloses a preparation method for a thermosetting hybrid polyester resin. The method comprises a synthesis step, a cooling step and a vacuum-pumping and curing step. Compared to the prior art, the invention has the following advantages: considerable long-chain monomers in the fatty group are introduced to improve the toughness of resin; the viscosity of the resin is controlled, andthe amount of auxiliary agents in a later stage is controlled, thereby enabling a plate surface to have high leveling performance and enabling better balance between mechanical performance and glass transition temperature to be obtained. Compared to conventional products, the product prepared in the invention has the following advantages: low temperature curing is realized; the plate surface has good leveling performance and has horizontal fluidity up to more than 30 mm in a horizontal fluidity experiment under the conditions of a temperature of 140 DEG C and a time of 30 min.

Description

Technical field: [0001] The invention relates to a synthesis method of a thermosetting mixed polyester resin, in particular to a preparation method of a high leveling low temperature curing mixed polyester resin. Background technique: [0002] Due to its non-polluting, energy-saving, recyclable, and excellent comprehensive performance, powder coatings have a great advantage in the coatings industry and have developed rapidly in recent years. Hybrid polyester resin and epoxy resin are cured, mainly used indoors, with good decorative properties and acid, alkali and corrosion resistance. There are mainly three types of hybrid polyester resins: 50 / 50, 60 / 40 and 70 / 30. [0003] Usually the preparation method of mixed polyester resin is (taking 60 / 40 as an example): raise the temperature of the kettle to about 100°C, add neopentyl glycol, ethylene glycol, diethylene glycol, dimethyl 1-3 propanediol , purified terephthalic acid, adipic acid, and monobutyltin oxide, heated up to 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/85
Inventor 刘志坚李保才吴德清祝红广顾爱侠
Owner ANHUI SHENJIAN NEW MATERIALS
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