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Polyester resin for epoxy-cured powder coating with high glossiness and high leveling property and preparation method thereof

A technology of powder coating and polyester resin, applied in powder coating, epoxy resin coating, polyester coating, etc., can solve the problems of undiscovered patent reports, etc., and achieve the effect of excellent clarity, fullness and high leveling

Active Publication Date: 2014-03-19
ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, by changing the polyester resin, there is no need to add special leveling agents and wetting accelerators to prepare epoxy-cured high-gloss and high-leveling powder coatings; no patent reports have been found

Method used

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  • Polyester resin for epoxy-cured powder coating with high glossiness and high leveling property and preparation method thereof
  • Polyester resin for epoxy-cured powder coating with high glossiness and high leveling property and preparation method thereof
  • Polyester resin for epoxy-cured powder coating with high glossiness and high leveling property and preparation method thereof

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Embodiment Construction

[0023] The surface condition of the paint film after the powder coating is cured depends largely on the surface tension and system viscosity during the melting and leveling process. Surface tension can be understood as: when two phases are in contact with each other, the transition zone with a thickness of several molecules at the junction is called the interface. If one of the phases is gas, this interface is usually called the surface. For the gas-liquid interface, the forces on the molecules inside the liquid can cancel each other out, but the surface molecules are strongly pulled by the bulk phase molecules, while the pull force by the gas phase molecules is small, and this microscopic force unevenness is amplified to the macroscopic phase interface , so that there is a kind of tension everywhere on the surface molecules. The force acting on the unit boundary line is called surface tension. The direction of the force points to the tangent direction of the interface, express...

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Abstract

The invention relates to a polyester resin for an epoxy-cured powder coating with high glossiness and high leveling property and a preparation method thereof. The polyester resin has relatively high glass-transition temperature. The technical scheme is as follows: the polyester resin for the epoxy-cured powder coating with high glossiness and high leveling property orderly comprises the following components: neopentyl glycol, 2-methylpropanediol, diglycol, 2-butyl-2-ethyl-1, 3-propylene glycol, terephthalic acid, isophthalic acid, sebacic acid and trimellitic anhydride. The preparation method of the polyester resin for the epoxy-cured powder coating with high glossiness and high leveling property comprises the following steps: 1) adding a proportioning amount of polyhydric alcohol to a reaction kettle, heating at normal temperature, and then feeding a proportioning amount of polyatomic acid and esterification catalyst; 2) carrying out thermal reaction until the water yield of the esterified water can be up to 95% or more of theoretical water yield; 3) adding trimellitic anhydride and isophthalic acid, and carrying out thermal reaction; 4) gradually vacuumizing, and reacting; 5) discharging.

Description

technical field [0001] The invention relates to a polyester resin for powder coatings, in particular to a carboxyl-terminated polyester resin for hybrid powder coatings that is solidified with an epoxy resin in a ratio of 60:40, and secondly, the invention also relates to the preparation of the polyester resin method. Background technique [0002] Thermosetting powder coatings are mainly composed of resins, curing agents, pigments and fillers, additives, etc. Among them, pure polyester powder coatings and mixed powder coatings are the most important varieties in the domestic thermosetting powder coatings market. With the development of science and technology and the improvement of people's living standards, the performance requirements of materials have also increased. For hybrid powder coatings, not only excellent mechanical properties are required, but also excellent surface decoration is required. The commonly used polyester resin for hybrid powder coatings, due to the m...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/181C08G63/16C08G63/78C09D167/02C09D163/00C09D5/03
Inventor 廖萍徐忠根邱锋利应明友鲁国锋
Owner ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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