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Anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide and preparation method thereof

A hydroxyalkyl amide anti-yellowing technology, applied in coatings, powder coatings, polyester coatings, etc., can solve the problems of poor anti-yellowing performance, obvious and serious pinholes on the surface, and achieve long leveling time, Excellent high temperature yellowing resistance, slow effect

Pending Publication Date: 2022-07-22
HUANGSHAN HUAHUI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although this curing system has a series of advantages, such as fast curing speed and low curing temperature, it has application defects, such as poor anti-yellowing performance at high temperature, and the cured water molecules cannot escape in time due to too fast curing speed. , the result is obvious pinholes on the surface, especially when the thickness of the coating exceeds 90 μm, the pinholes are more serious

Method used

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  • Anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide and preparation method thereof
  • Anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide and preparation method thereof
  • Anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A preparation method of anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide; the molar composition of main raw materials comprises:

[0040]

[0041] The crystallization solvent is a mixed solvent of methanol and cyclohexanone, and the molar ratio of the two is 1:3.

[0042] The preparation method includes the following steps:

[0043] A, add methyl para-tert-butyl benzoate, dimethyl adipate respectively in header tank 1 and header tank 2 for subsequent use;

[0044] B. Add the diethanolamine and catalyst of the formula amount into the reaction kettle, after stirring evenly, heat up to 100-115 ° C, then start the vacuum, when the vacuum degree reaches -0.090Mpa to -0.095Mpa, dropwise add the Methyl p-tert-butylbenzoate, and carry out insulation reaction;

[0045] C, when methyl p-tert-butylbenzoate is added dropwise to half of the formula amount, stop the dripping, use vacuum to inhale the diisopropanolamine of the formula amount in the reactor at ...

Embodiment 2

[0052] A preparation method of anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide; the molar composition of main raw materials comprises:

[0053]

[0054] The crystallization solvent is a mixed solvent of methanol and cyclohexanone, and the molar ratio of the two is 1:3.5.

[0055] The preparation method is the same as in Example 1.

[0056] Prepared product: hydroxyl equivalent: 108 g / mol, yield 95%; average functionality of the prepared product is 3.

Embodiment 3

[0058] A preparation method of anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide; the molar composition of main raw materials comprises:

[0059]

[0060] The crystallization solvent is a mixed solvent of methanol and cyclohexanone, and the molar ratio of the two is 1:3.

[0061] The preparation method is the same as in Example 1.

[0062] Prepared product: hydroxyl equivalent: 113 g / mol, yield 94%; average functionality of the prepared product is 2.8.

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Abstract

The invention relates to a preparation method of anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide. The anti-yellowing and anti-thick-coating pinhole type hydroxyalkylamide is mainly obtained by gradually reacting dimethyl adipate, methyl p-tert-butylbenzoate, diisopropanolamine, diethanol amine and a catalytic system. According to the present invention, the prepared product contains the two ester structure raw materials and the two alcohol amine raw materials, such that the average functionality of the prepared product is 2.5-3, the average functionality is significantly reduced compared with the general type hydroxyalkylamide product with the functionality of 4, the curing speed is slow, the leveling time is long, the problem of the thick coating pinhole after the product coating can be well solved, and the product has the good application prospect. And meanwhile, the product has excellent high-temperature yellowing resistance.

Description

technical field [0001] The invention belongs to the technical field of powder coating synthesis, in particular to an anti-yellowing, anti-thick-coating pinhole type hydroxyalkylamide and a preparation method thereof, and further discloses the preparation method and the application of preparing powder coatings. Background technique [0002] At present, the hydroxyalkylamide curing agent is mainly N;N;N';N'-tetrakis (2-hydroxyethyl) adipamide (referred to as HAA), and its molecular structure is [0003] [0004] Although the curing system has a series of advantages, such as fast curing speed, low curing temperature, etc., it has application defects, such as poor high temperature anti-yellowing performance, and curing water molecules cannot escape in time due to excessive curing speed , the result is that the surface pinholes are obvious, especially for thick coatings with a thickness of more than 90 μm. [0005] In view of the problems existing in the product at present, t...

Claims

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Application Information

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IPC IPC(8): C08K5/20C09D5/03C09D167/00C09D7/63
CPCC08K5/20C09D5/033C09D167/00C09D5/18
Inventor 林光伟杨志萍刘文雅项纯何领曹镇
Owner HUANGSHAN HUAHUI TECH
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