Nitrogen oxide fumigating yellowing resistant polyester resin for powder coating and preparation method thereof

A technology of polyester resin and nitrogen oxide, which is applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of affecting product quality, yellowing of powder coating color, and increased color difference, and achieves a wide range of applications, Excellent anti-yellowing performance

CN106543419AInactive Publication Date: 2017-03-29GUANGZHOU KINTE IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-03-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a nitrogen oxide fumigating yellowing resistant polyester resin for powder coating. The resin comprises the following components by mass percentage: 30-48 parts of diol, 0-5 parts of polyol, 50-68 parts of binary acid, 0-0.1 part of a curing accelerator, and 0.5-5 parts of an antioxidant. The invention also discloses a preparation method of the polyester resin for powder coating. The resin has appropriate acid value and viscosity, and the prepared powder coating has excellent resistance to nitrogen oxide fumigating yellowing.
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Description

technical field

[0001] The invention relates to a polyester resin for a powder coating resistant to nitrogen oxide gas yellowing and a preparation method thereof.

[0002] technical background

[0003] Due to the advantages of solvent-free, high material reuse rate and low energy consumption, powder coating is in the stage of rapid development and has been widely recognized by the market. With the continuous in-depth development of the coatings industry, customers are also constantly reporting some problems in the application of powder coatings, among which the coating difference caused by the heating method of powder coating curing is one of the aspects.

[0004] The heating methods for powder coating curing include electric heating, gas furnace heating, kerosene heating and coal heating. Due to the high cost of electric heating, spraying manufacturers use more heating methods such as gas heating, kerosene and coal. However, since gas, kerosene, coal, etc. belong to fossil...

Examples

Embodiment Construction

[0028] The present invention will be further described below in conjunction with embodiment:

[0029] Table 1 shows five different examples of A-E, and F is a comparative example. First, the temperature of the reactor was raised to 80°C, and neopentyl glycol, ethyl butyl propylene glycol, trimethylolpropane, terephthalic acid, and monobutyltin oxide were added according to the formula described in Table 1, and under nitrogen protection, Raise the temperature to 180°C, keep it at 180°C for 1 hour, then raise the temperature to 190°C and keep it for 1 hour, raise the temperature to 200°C and keep it for 1.5 hours, raise the temperature to 210°C and keep it for 2 hours, raise the temperature to 220°C and keep it for 1 hour, then raise the temperature to 240°C and keep it for 3 hours, until the material is clear Finally, test the acid value and viscosity, wherein the acid value is 6-9mgKOH / g, the viscosity is 800-1500mPa∙s, after reaching the standard, cool down to 230°C, add adip...