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Alkyd resin and preparation

A technology of alkyd resin and fatty acid, applied in the field of improved alkyd resin and preparation, can solve the problems of difficult varnish and light-color solid-color paint, opaque appearance, long production cycle, etc., and achieves complete reaction, good transparency, Fast-drying effect of paint film

Inactive Publication Date: 2007-09-12
JIANGSU SANMU GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The applicant once tried to use crude terephthalic acid instead of phthalic anhydride to produce air-drying alkyd resin by one-step high-temperature esterification. Although it was successful, it still found some shortcomings: for example, one-step high-temperature esterification, high reaction temperature, It needs to be reacted at 280-290°C, and the production cycle is long, about 30 hours or more, and the consumption is high
It is a waste of energy, and the resin produced is dark in color and opaque in appearance, resulting in limited use, making it difficult to make varnishes and light-colored solid-color paints

Method used

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  • Alkyd resin and preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Put 48wt% soybean oil acid, 17wt% glycerin, 25wt% crude terephthalic acid, plus 0.09wt% butyl tin catalyst into a stainless steel reactor, seal the feeding port, open the vent valve, heat up and stir . A large amount of water appears when the temperature is raised to 120°C (pay attention to the pot). Keep the temperature at 235-240°C for 3 hours. After sampling, the temperature is lowered to 200°C. After the material is transparent, 2wt% of phthalic anhydride, 6wt% of rosin and 2wt% of rosin are added. Benzoic acid and an appropriate amount of reflux solvent, heat up to 240-245°C and keep it warm until the centrally controlled acid value is below 14 and the Grignard viscosity is 8-11 seconds. The entire production process takes about 22-24 hours. Finally, the temperature was lowered to below 160°C and 200# solvent was added to adjust the viscosity, and filtered by pressure.

Embodiment 2

[0019] Example 2: Put 8wt% of linoleic acid, 48wt% of soybean oleic acid, 12wt% of pentaerythritol, 14wt% of crude terephthalic acid, plus 0.09wt% of butyl tin catalyst into a stainless steel reactor. The subsequent feeding ratio is 4wt% phthalic anhydride, 10wt% rosin, 4wt% benzoic acid. The method steps are the same as in Example 1. All indexes of the obtained alkyd resin are the same except that the color is darker than that of Example 1. As the replacement amount is reduced and linoleic acid is added, the cost is higher than that of Example 1.

Embodiment 3

[0020] Example 3: The feed ratio is 10wt% linoleic acid, 44wt% soybean oil acid, 17wt% glycerin, 16wt% crude terephthalic acid, plus 0.09wt% butyl tin catalyst, 2wt% phthalic anhydride, 10wt% rosin, 1.0wt% Of benzoic acid. The preparation method is the same as before.

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Abstract

The invention relates to a method for preparing alkyd resin with crude terephthalic acid instead of most of phthalic anhydride. Its characters show as follow: firstly, it uses 45~60wt% of the fatty acid ,14~20wt% of polyol, 9~25wt% of crude terephthalate, and 0.08~0.12wt% of tributyltin catalyst for esterification, after it comes to be transparent, then it adds 1.0~5.0%wt of diphenyl formylic anhydride, 6~14wt% of rosin, 1.0~5.0 wt% of benzoic acid for a further esterification till acid number to be below 14 and grignard viscosity to be 8~11 seconds.

Description

Technical field: [0001] The present invention relates to an improved alkyd resin and its preparation method, in particular to use the by-product of producing purified terephthalic acid (commonly known as terephthalic acid pool material, also known as crude terephthalic acid) to replace most of the phthalic acid Dicarboxylic anhydride (phthalic anhydride for short) prepares air-drying alkyd resin and method. Background technique: [0002] Alkyd resin is a widely used synthetic resin for coatings. It can be used as primer, topcoat, and varnish. It can also be combined with other resins such as amino resins and polyurethane resins to prepare baking paints or two-component paints. A common preparation method of alkyd resin is composed of 45-60wt% fatty acid (such as soybean oil acid, linoleic acid), 14-20wt% polyol (such as pentaerythritol or equivalent glycerin), 26-35wt% polyacid (such as phthalic anhydride) ), obtained by esterification reaction. In recent years, due to the impact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/48
Inventor 杨树民刘益明
Owner JIANGSU SANMU GROUP CORPORATION
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