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Catalyst capable of reducing curing temperature of saturated polyester resin taking carboxyl as end group

A technology of polyester resin and curing temperature, which is applied to the catalyst of saturated polyester resin curing temperature and its preparation field, can solve the problems of poor decoration of powder coatings, disappearance of decorative functions, easy occurrence of true pores and other problems, and achieves convenient operation, The effect of reducing melt viscosity and promoting leveling

Inactive Publication Date: 2014-02-26
TIANJIN XIANGSHENG NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of low-temperature curing of powder coatings, it is necessary to start with a curing agent or a catalyst. After selecting a suitable curing agent, the catalyst needs to be considered. Now the conventional catalyst is also the most effective catalyst. The catalyst is imidazole, which promotes the ring opening of epoxy resin. It can cure epoxy powder coatings or epoxy / polyester powder coatings at the lowest temperature of 120°C, but the decorative function of the surface will basically disappear, so pure imidazole catalysts are not ideal catalysts for powder coatings to achieve low temperature curing. This requires the development of a low-temperature catalyst that can not only meet the decorative requirements but also achieve low-temperature curing and its performance remains unchanged.
[0003] At the same time, pure imidazole catalysts have the disadvantages of poor decorativeness of powder coatings, easy occurrence of true pore bubbles, pollution, and discoloration such as yellowing of color.

Method used

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  • Catalyst capable of reducing curing temperature of saturated polyester resin taking carboxyl as end group
  • Catalyst capable of reducing curing temperature of saturated polyester resin taking carboxyl as end group
  • Catalyst capable of reducing curing temperature of saturated polyester resin taking carboxyl as end group

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of catalyst that can reduce the curing temperature of the saturated polyester resin whose end group is carboxyl, its raw material composition and its weight are as follows:

[0033]

[0034]

[0035] The steps of the preparation method of above-mentioned catalyst are as follows:

[0036] Put the polyester resin 6055 into the reaction kettle, melt and stir it at a temperature of 170-180°C, and then add triphenylethylphosphonium bromide, 2-phenylimidazole and antioxidant 1010 (arbitrary order) respectively Add it into the melted polyester resin, stir it evenly for 20 minutes, cool and press it, and finally form a milky white transparent solid, which is the catalyst A that can reduce the curing temperature of the saturated polyester resin whose end group is a carboxyl group.

[0037] How to use: The obtained catalyst A can be added to the formula of the powder coating according to the requirement of the curing temperature of the powder coating according to the...

Embodiment 2

[0039] A kind of catalyst that can reduce the curing temperature of the saturated polyester resin whose end group is carboxyl, its raw material composition and its weight are as follows:

[0040]

[0041] The steps of the preparation method of above-mentioned catalyst are as follows:

[0042] Add various materials to the high-speed mixer, and extrude through the extruder after dry mixing. The temperature in the first zone is 80-90°C, and the temperature in the second zone is 100-120°C. Melt, knead, extrude, and cool , Tablet, become flaky milky white solid, promptly obtain the catalyst B that can reduce the curing temperature of the saturated polyester resin whose end group is carboxyl group.

[0043] How to use: The obtained catalyst B can be added to the formula of the powder coating according to the requirement of the curing temperature of the powder coating in an amount of 0.1%-5% by mass fraction.

Embodiment 3

[0045] A kind of catalyst that can reduce the curing temperature of the saturated polyester resin whose end group is carboxyl, its raw material composition and its weight are as follows:

[0046]

[0047] The preparation method of the above-mentioned catalyst is the same as in Example 1, and the catalyst C which can reduce the curing temperature of the saturated polyester resin whose terminal group is a carboxyl group is obtained.

[0048] How to use: The obtained catalyst C can be added to the formula of the powder coating according to the requirement of the curing temperature of the powder coating in an amount of 0.1%-5% by mass fraction.

[0049] Practical application effect and test situation of powder coating of the present invention:

[0050]In order to check the actual application effect of the catalyst of the present invention, the specific operations are as follows: the catalysts A, B and C prepared in the examples are added to the formula of the powder coating in ...

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Abstract

The invention relates to a catalyst capable of reducing the curing temperature of saturated polyester resin taking carboxyl as the end group. The catalyst comprises the following raw materials in parts by weight: 70-95 parts of low-viscosity polyester resin, 5-20 parts of phase transfer catalyst capable of catalyzing carboxyl, 1-10 parts of catalyst capable of promoting ring opening of an epoxy group and 5-20 parts of antioxidant. The catalyst provided by the invention reduces the curing temperature of polyester / epoxy or pure-polyester powder coating, shortens the curing time, and can promote reaction of the powder coating at relatively low temperature to realize an energy saving function without influencing the decorativeness and functionality of the powder coating; the color yellowing of the powder coating is avoided, and the catalyst can be applied to white or light-colored powder; and meanwhile, a preparation method of the catalyst is simple and convenient to operate, the state call for saving energy and reducing emission is answered, the production cost is lowered, and the economic benefits of an enterprise are increased.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a catalyst, in particular to a catalyst capable of reducing the curing temperature of a saturated polyester resin whose terminal group is a carboxyl group and a preparation method thereof. Background technique [0002] Powder coating and coating technology is a new technology developed in the middle of the 20th century. The new process has attracted worldwide attention due to its characteristics of no need to discharge organic matter into the air, reduce environmental pollution, simple process, easy industrial automation, and excellent coating performance. The attention of the coating industry in various countries. Powder coating itself is a new type of solvent-free, 100% solid powder coating. Although it is non-polluting, it needs to be melted and solidified at a baking temperature above 180°C to meet the requirements for use. Now the country and society are It is required to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/68C09D7/12C09D167/00C09D5/03
Inventor 陈超王焱王浩
Owner TIANJIN XIANGSHENG NEW MATERIALS CO LTD
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