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Short oil alkyd resin and preparation method thereof

An alkyd resin, short oil degree technology, applied in the field of coatings, can solve the problems of large batch performance difference, difficult process operation, serious material loss, etc., to achieve the effect of fast curing speed, improving curing speed and reducing material loss

Active Publication Date: 2015-06-10
ZHUHAI CHANGXIAN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting method has simple equipment, high utilization rate, and safety, but the product has deep color, uneven structure, large batch performance difference, and difficult process operation. Therefore, when preparing short oil alkyd resin, the solvent method is generally used. The solvent method is because Using a reflux device, the reaction temperature can be controlled by controlling the amount of solvent, and the water produced by the reaction is easily taken out, which can shorten the reaction time. However, when the water is taken out by reflux, the loss of materials is also very serious, especially polyols. Easy to be carried out with moisture

Method used

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  • Short oil alkyd resin and preparation method thereof
  • Short oil alkyd resin and preparation method thereof
  • Short oil alkyd resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A short-oil alkyd resin synthesized by terephthalic acid, consisting of the following raw materials in parts by weight:

[0032]

[0033] Using terephthalic acid to synthesize short oil alkyd resin, the specific preparation method is as follows:

[0034] (1) first add vegetable oleic acid, glycerin, catalyst in reactor, mix and stir;

[0035] (2) Then add maleic anhydride, terephthalic acid, and benzoic acid, pass protective gas, heat up to 100°C, start stirring, continue to heat up to 160°C, turn down the flow of protective gas, and uniformly heat up to 230°C for 4 hours to keep warm For the reaction, when the acid value is detected to be 22mgKOH / g, add a reflux solvent and continue the esterification reaction at a constant temperature. When the acid value is detected to be 2.0mgKOH / g, lower the temperature to 150°C, add phthalic anhydride, and heat up to about 210°C for esterification Chemical reaction, when the acid value of the medium-controlled viscosity is qua...

Embodiment 2

[0037] A short-oil alkyd resin synthesized by terephthalic acid, consisting of the following raw materials in parts by weight:

[0038]

[0039]

[0040] Using terephthalic acid to synthesize short oil alkyd resin, the specific preparation method is as follows:

[0041] (1) first add vegetable oleic acid, glycerin, catalyst in reactor, mix and stir;

[0042] (2) Then add maleic anhydride, terephthalic acid, and benzoic acid, pass the protective gas, heat up to 95°C, start stirring, continue to heat up to 170°C, turn down the flow rate of the protective gas, and uniformly heat up to 240°C for 4 hours to keep warm For the reaction, when the acid value is detected to be 18 mgKOH / g, add a reflux solvent and continue the esterification reaction at a constant temperature. When the acid value is detected to be 2.7 mgKOH / g, lower the temperature to 145°C, add phthalic anhydride, and heat up to 220°C for esterification Reaction, when the acid value is detected to be 6mgKOH / g, an...

Embodiment 3

[0044] A short-oil alkyd resin synthesized by terephthalic acid, consisting of the following raw materials in parts by weight:

[0045]

[0046] Using terephthalic acid to synthesize short oil alkyd resin, the specific preparation method is as follows:

[0047] (1) first add vegetable oleic acid, glycerin, catalyst in reactor, mix and stir;

[0048] (2) Then add maleic anhydride, terephthalic acid, and benzoic acid, pass the protective gas, heat up to 110°C, start stirring, continue to heat up to 150°C, turn down the flow rate of the protective gas, and uniformly heat up to 220°C for 4 hours to keep warm For the reaction, when the acid value is detected to be 15mgKOH / g, add a reflux solvent and continue the esterification reaction at a constant temperature. When the acid value is detected to be 2.0mgKOH / g, lower the temperature to 130°C, add phthalic anhydride, and heat up to about 210°C for esterification Chemical reaction, when the acid value is detected to be 5.9mgKOH / g...

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Abstract

The invention discloses a short oil alkyd resin and a preparation method thereof. The short oil alkyd resin comprises the following raw materials in parts by weight: 20-25 parts of vegetable oleic acid, 1.5-3.5 parts of benzoic acid, 2-8 parts of phthalic anhydride, 0-5 parts of maleic anhydride, 15-30 parts of terephthalic acid, 15-25 parts of glycerinum, 0.0001-0.0008 part of a catalyst, 0.5-1 part of a reflux solvent, 20-40 parts of a dilution solvent and 0.0001-0.0008 part of a drier. The alkyd resin prepared by the invention is low in price, high in weather resistance, high in hardness, high in transparency, excellent in cost performance and high in drying speed and is high in compatibility with aromatic solvents and esters solvents.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a short-oil alkyd resin synthesized with terephthalic acid and a preparation method thereof. Background technique [0002] Alkyd resin is a very important synthetic resin for coatings. Its raw materials are easy to obtain, its products are diversified, its cost performance is high, and its construction is convenient. Alkyd resins can be classified into long oil, medium oil and short oil. Alkyd resins with an oil content of less than 50% are called short-oil alkyd resins. The dibasic acids of the traditional synthetic alkyd resins all use phthalic anhydride and isophthalic acid. Phthalic anhydride is easy to get, moderately priced and has high reactivity. Isophthalic acid is expensive and has low reactivity. The synthesized alkyd resin is resistant to hydrolysis and has good weather resistance. Terephthalic acid has the advantages of both, wide sources of raw materials, cheap price, and...

Claims

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Application Information

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IPC IPC(8): C08G63/52C08G63/49C08G63/85C09D167/08C09D167/06C09D7/12
Inventor 叶维雪王海艳
Owner ZHUHAI CHANGXIAN CHEM TECH
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