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A kind of alkyd resin and preparation method thereof

A technology of alkyd resin and acid value, which is applied in the field of resin, can solve the problems of sudden changes in atmospheric pressure, limit the application of stearic acid and palmitic acid, shorten the use time of alkyd resin, etc., and achieve yellowing resistance, weather resistance, and proportioning reasonable effect

Active Publication Date: 2020-04-14
JIANGMEN PAINT FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating film prepared from the alkyd resin paint prepared by using these two fatty acids as raw materials has a fatal disadvantage: in the environment where the temperature suddenly drops in autumn and winter, the ambient atmospheric pressure changes suddenly, and the humidity is high, the surface of the coating film will be damaged. A layer of hoarfrost-like crystals appeared
This precipitation phenomenon greatly shortens the use time of the alkyd resin synthesized with fatty acids as raw materials after the paint is mixed, and severely limits the application of stearic acid and palmitic acid in alkyd resin.

Method used

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  • A kind of alkyd resin and preparation method thereof
  • A kind of alkyd resin and preparation method thereof
  • A kind of alkyd resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An alkyd resin for baking varnish, comprising the following components by weight: 216.3 parts of stearic acid, 269 parts of phthalic anhydride, 43 parts of benzoic acid, 187 parts of glycerin, 0.1 part of hypophosphorous acid, 0.12 part of phosphorous acid Triphenyl ester, 283.9 parts of xylene. The preparation method of alkyd resin for baking varnish comprises the following steps:

[0033] (1) Put stearic acid, benzoic acid, glycerin, hypophosphorous acid, triphenyl phosphite into the reaction vessel, vacuumize to -0.99MPa and keep vacuuming for 40 minutes;

[0034] (2) adopt 99.99% high-purity nitrogen to fill the reaction vessel to normal pressure, then open the air;

[0035] (3) Add 10-25% xylene, heat up to 120°C and start stirring;

[0036] (4) Evenly heat up to 160°C within 2-3 hours and keep it warm for 1 hour, then heat up to 210°C within 2-3 hours, keep warm until the acid value of the material is ≤1mg KOH / g;

[0037] (5) be cooled to 120 ℃, drop into the x...

Embodiment 2

[0041] An alkyd resin for baking varnish, comprising the following components by weight: 227.9 parts of stearic acid, 262.7 parts of phthalic anhydride, 42.2 parts of benzoic acid, 183 parts of glycerin, 0.1 part of hypophosphorous acid, 0.12 part of phosphorous acid Triphenyl ester, 284 parts xylene.

[0042] The preparation method of the alkyd resin for baking varnish is the same as in Example 1.

Embodiment 3

[0044] An alkyd resin for baking varnish, comprising the following components by weight: 234.1 parts of palmitic acid, 259.4 parts of phthalic anhydride, 41.7 parts of benzoic acid, 180.6 parts of glycerin, 0.1 part of hypophosphorous acid, 0.12 part of phosphorous acid Triphenyl ester, 284 parts xylene.

[0045] The preparation method of the alkyd resin for baking varnish is the same as in Example 1.

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Abstract

The invention belongs to the technical field of resin, and particularly relates to an alkyd resin as well as a preparation method of same. The alkyd resin includes, by weight, 214-235 parts of fatty acid, 259-291 parts of phthalic anhydride, 0-43 parts of benzoic acid, 0-142 parts of pentaerythritol, 0-187 parts of glycerin, 0-68 parts of ethylene glycol, 0.05-0.1 parts of hypophosphorous acid, 0.08-0.12 parts of an antioxidant, and 269-335 parts of dimethylbenzene. In the method, the ratio of fatty acid to other components is reasonable, so that the alkyd resin, synthesized through the two-step process, is anti-yellowing and weather-resistant. The method also solves the problems that after alkyd resin, produced from fatty acid as a raw material in the prior art, is used for preparing paint, crystal substances are separated out from the paint when the temperature in autumn and winter decreases sharply, the atmosphere pressure is changed sharply and humidity is low.

Description

technical field [0001] The invention belongs to the technical field of resins, and in particular relates to an alkyd resin and a preparation method thereof. Background technique [0002] Stearic acid and palmitic acid are fatty acids that widely exist in nature and are renewable typical low iodine value saturated fatty acids. Using these two fatty acids as raw materials of alkyd resin, the synthesized alkyd resin has excellent yellowing resistance in baking and yellowing resistance in ultraviolet radiation, and excellent weather resistance of the paint film at the same time. However, the coating film prepared from the alkyd resin paint prepared by using these two fatty acids as raw materials has a fatal disadvantage: in the environment where the temperature suddenly drops in autumn and winter, the ambient atmospheric pressure changes suddenly, and the humidity is high, the surface of the coating film will be damaged. A layer of hoarfrost-like crystals appeared. Although th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/46C08G63/20C09D167/08C09D167/02
CPCC08G63/20C08G63/46C09D167/02C09D167/08
Inventor 程建黄晓昌孙宁谢桂洪张文奋
Owner JIANGMEN PAINT FACTORY
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