Water boiling-resistant high-color fastness polyester resin for TGIC powder coating and preparation method thereof
A powder coating and polyester resin technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of poor leveling, poor weather resistance, low acid value and viscosity, and achieve small color difference and excellent water boiling resistance. With mechanical properties, the effect of preventing fading
Inactive Publication Date: 2017-03-29
GUANGZHOU KINTE IND
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[0003] CN105061741A discloses a boiling-resistant polyester resin and its preparation method, wherein the synthesized resin has an acid value of 3-6mgKOH / g, a viscosity of 1000-1300mP.s (ICI cone-plate viscometer, 175°C), and has good boiling-resistant performance And good wear resistance, durability, but the implementation method provided is currently not widely used in the polyester industry, the acid value and viscosity are small, and the application in the powder coating industry is limited
[0004] CN103304789A discloses a polyester resin for hybrid powder coatings and a preparation method thereof, adopts epoxy resin curing, and the prepared powder coating has excellent water boiling resistance and mechanical properties; but compared with the common type 6:4 type powder coating , its leveling is relatively poor, and since the monomers used to prepare polyester resins are mainly non-weather-resistant monomers, their weather resistance is poor, so they are not suitable for outdoor products
[0006] CN105860046A discloses water-resistant polyester resin and its preparation method, but it also belongs to indoor epoxy curing, similar to CN103304789A, which cannot satisfy the weather resistance of the coating
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[0037] The following are specific embodiments of the present invention, the purpose of which is to help the understanding of the present invention rather than to limit the present invention.
[0038] (1) Take the polyol and heat it up until the material melts, then add the proportioned amount of polyacid and catalyst, and continue the temperature rise reaction with nitrogen gas, until 180°C esterification water begins to form and distill; then gradually raise the temperature to 250°C, and react 2 ~5 hours until 95% of the esterification water is discharged, the reaction system is clear and free of particles, and the acid value reaches 9~18mgKOH / g;
[0039] (2) Add the proportioned amount of chain extender into the reaction kettle and react for 3~5 hours. After the acid value reaches 35~55mgKOH / g, vacuumize and polycondense for 1~4 hours. The acid value reaches 25~45mgKOH / g, and the melt viscosity is 3000~8000mPa∙s (ICI cone-plate viscometer, 200°C), at this time, add boiling-r...
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Abstract
The invention discloses water boiling-resistant high-color fastness polyester resin for a TGIC powder coating. The water boiling-resistant high-color fastness polyester resin is prepared from 25 to 45% by weight of polyhydric alcohol, 40 to 60% by weight of polybasic acid, 5 to 15% by weight of a chain extender, 0.01 to 0.15% by weight of a catalyst and 0.05 to 2% by weight of a water boiling-resistant assistant through a melt phase polycondensation reaction. The invention also discloses a preparation method of the water boiling-resistant high-color fastness polyester resin for a TGIC powder coating. The polyester resin is TGIC gel-type resin, has good weatherability, has a moderate glass transition temperature and viscosity, has excellent resistance to water boiling and mechanical properties in an outdoor or humid environment and prevents coating fading after long-term use.
Description
technical field [0001] The invention relates to a polyester resin for TGIC cured powder coatings, in particular to a polyester resin for TGIC type powder coatings with high boiling color fastness. The invention also relates to a preparation method of the polyester resin. Background technique [0002] As an environmentally friendly industrial coating with excellent performance, powder coating has been widely recognized by the market after nearly 30 years of extensive application. With the improvement of people's aesthetics of life, home decoration and kitchen and bathroom products have different colors, while ordinary outdoor dark coatings are prone to loss of light, blistering, fading, poor adhesion or even the whole film under the rain or humid environment. The phenomenon of peeling, the coating loses its protective effect on the substrate. Powder coatings have poor water resistance, and the reason why the coating is easy to fade is mainly related to the degree of curing,...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): C08G63/20C08K5/50C08K5/526C08K5/134C09D167/02C09D5/03C09D7/12
CPCC08G63/20C08K5/1345C08K5/50C08K5/526C08K2201/014C09D5/033C09D167/02
Inventor 罗逸谢静李勇刘亮王伟跃史远堂程润顾宇昕
Owner GUANGZHOU KINTE IND
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