Carboxyl-terminated fluorine-containing polyester resin for powder coating with high gloss, impact resistance and super weather resistance and preparation method thereof

Abstract

The invention provides a high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for a powder coating and a preparation method thereof. Compared with the prior art, the fluorine-containing polyester resin prepared by the preparation method is a resin with acid value of 23-35 mgKOH / g, hydroxyl value of less than 10 mgKOH / g, glass-transition temperature of 55-75 degrees centigrade, melt viscosity of 2000-22000 mPa.s / 200 degrees centigrade and number-average molecular weight of 2500-8000. The high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for the powder coating has the advantages of appropriate glass-transition temperature, storage stability, simple resin synthetic process, low resin cost and so on. The powder coating, which is prepared by curing the high-gloss, impact resistant and super weather-resistant carboxyl terminated fluorine-containing polyester resin for the powder coating together with triglycidyl isocyanurate or hydroxyl alkyl amide, has the advantages of super weather resistance, high gloss, superior levelling, excellent impact resistance and so on.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a high-gloss, impact-resistant and super-weather-resistant carboxyl-terminated fluorine-containing polyester resin for powder coatings and a preparation method thereof. Background technique [0002] Polyester powder coating for outdoor use is a widely used thermosetting coating, which currently accounts for about 70% of the total output of powder coatings. It has the advantages of energy saving, environmental friendliness, long service life and excellent performance. It is widely used in various outdoor The coating of the surface of parts. [0003] As the powder coating market expands, people are increasingly demanding weather resistance. For example, the secondary coating of aluminum profiles for high-rise buildings and sea-crossing bridges is very difficult during the service life, so super weather-resistant powder coatings are generally selected to avoid frequent secondary...

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN201510009803.8 "Polyester resin for super weather-resistant powder coating, powder coating using the resin and its preparation method" by adding tetrafluoroisophthalic acid, hexafluoroglutaric acid and 1H, 1H in the synthesis process, 10H, 10H-perfluoro-1,10-decanediol improves weather resistance, but tetrafluoroisophthalic acid, hexafluoroglutaric acid and 1H, 1H, 10H, 10H-perfluoro-1,10-decanediol Diols are very expensive and cannot be industrialized

[0007] Chinese patent CN200910184341.8 "a super-weather-resistant powder coating and its preparation method and application" discloses the preparation of super-weather-resistant powder coatings by extruding and blending conventional weather-resistant polyester resins and FEVE fluorocarbon resins. However, due to the poor compatibility of the mixed system prepared by extrusion, the system has defects such as low gloss and poor impact performance, which is also unfavorable for market promotion.

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