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Epoxy ester modified aqueous alkyd resin and preparation method thereof

A water-based alkyd resin, alkyd resin technology, applied in the direction of coating, can solve the problems of increased viscosity, easy gelation, deepening of resin color, etc., to achieve the effect of good hardness, good yellowing resistance, and not easy to stick

Inactive Publication Date: 2012-12-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the choice of hydrophilic monomer will also directly affect the performance of the coating film. Now when the more common trimellitic anhydride is introduced into the alkyd resin as a hydrophilic monomer, the color of the resin will easily deepen and the viscosity will increase. It is very easy to gel at a specific acid value, so it is particularly important to find an excellent epoxy ester and hydrophilic monomer

Method used

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  • Epoxy ester modified aqueous alkyd resin and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Add 55g of soy oil, 20g of phthalic anhydride, 30g of trimethylolpropane, 0.28g of organotin catalyst BC-98, 7g of xylene, heat to 180°C, reflux reaction for 1h, at 10°C / h Raise the temperature to 230°C, hold the temperature for 40 minutes, and stop the reaction when the acid value drops to 31mgKOH / g;

[0032] (2) Put 28g of soybean oil fatty acid, epoxy resin E-2015g, and 3.4g of triphenylphosphine into another reactor, heat up to 180°C, keep the temperature for 1 hour, and record the acid value less than 5mgKOH / g; The epoxy resin molar ratio is 2.7g of maleic anhydride of 1: 1, catalyst benzoyl peroxide BPO 0.92g, heat preservation copolymerization at 180 ℃ for 2h, generate epoxy ester;

[0033] (3) Add 10g of xylene, 1.5g of BC-98, and the above-mentioned epoxy ester into the reactor with alkyd resin, and reflux at 180°C for 1h. When the acid value is lower than 7mgKOH / g, stop stirring and filter with suction Remove the solvent, lower the temperature to 110°C; a...

Embodiment 2

[0035] (1) Add 70g of linolenic acid, 20g of adipic acid, 25g of trimethylolpropane, BC-980.34g, 8.41g of xylene, heat to 180°C, reflux for 1h, and heat up to 230°C at a rate of 10°C / h , heat preservation reaction for 35min, stop the reaction when the acid value drops to 33mgKOH / g;

[0036] (2) Put 18g of linolenic acid, epoxy resin E-2032g, and 0.4g of triphenylphosphine into another reactor, heat up to 180°C, keep the temperature for 1 hour, and record the acid value less than 5mgKOH / g; The epoxy resin molar ratio is 3.14g of maleic anhydride of 1:1, catalyst benzoyl peroxide BPO 1.06g, heat preservation copolymerization at 180 ℃ for 2.5h, generate epoxy ester;

[0037] (3) Add 12g of xylene, 1.8g of BC-98, and the above-mentioned epoxy ester into the reactor with alkyd resin, and reflux at 180°C for 1h. When the acid value is lower than 7mgKOH / g, stop stirring and filter with suction Remove the solvent, lower the temperature to 110°C; add 13.28g of 2-acrylamide-2-methylpro...

Embodiment 3

[0039](1) Add 60g of linolenic acid, 30g of phthalic anhydride, 25g of pentaerythritol, BC-980.36g, 8.94g of xylene, heat to 180°C, reflux for 1h, heat up to 230°C at a rate of 10°C / h, and keep warm React for 40min, stop the reaction when the acid value drops to 30.2mgKOH / g;

[0040] (2) Put 35.22g of linolenic acid, 24.78g of epoxy resin E-5124.78g, and 0.48g of triphenylphosphine into another reactor, raise the temperature to 180°C, keep the temperature for 1 hour, and the measured acid value is less than 5mgKOH / g; add 3.77g of maleic anhydride and 1.28g of catalyst benzoyl peroxide BPO with a molar ratio of 1:1 to the epoxy resin were incubated at 180°C for 2 hours to generate epoxy ester;

[0041] (3) Add 10g of xylene, 1.5g of BC-98, and the above-mentioned epoxy ester into the reactor with alkyd resin, and reflux at 180°C for 1.5h. When the acid value is lower than 7mgKOH / g, stop stirring and pump The solvent was filtered off, and the temperature was lowered to 110°C; 1...

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Abstract

The invention discloses an epoxy ester modified aqueous alkyd resin and a preparation method thereof. The method comprises the following steps of: preparing alkyd resin, synthesizing epoxy ester, and synthesizing the epoxy ester modified aqueous alkyd resin: stirring and mixing epoxy ester and basic alkyd resin in mass ratio of 0.2:1-0.5:1, 1-3 parts of organic tin catalyst and 5-15 parts of dimethyl benzene, and performing reflux reaction at the temperature of 180 DEG C for 1-2 hours until the acid value is measured to be less than 7mgKOH / g; and water-dissolving the modified alkyd resin. A product provided by the invention keeps superior performances of paint dryness, glossiness, durability, flexibility, hardness, higher solubility and the like of the alkyd resin, has superior cohesive property, salt fog resistance and good self-drying property of the epoxy resin, and can keep that a coating has superior solvent resistance and chemical resistance.

Description

technical field [0001] The invention relates to the field of metal surface anticorrosion, in particular to an epoxy ester modified water-based alkyd resin and a preparation method thereof. Background technique [0002] Alkyd resin has excellent durability, gloss, flexibility, hardness, and excellent brushability, and is widely used in vehicles, railways, shipbuilding, construction and other fields. However, solvent-based alkyd resins are often used at present, and the rapid volatilization of a large amount of solvents is one of the ways to quickly dry the resin coating, thus causing huge pollution to the environment. With the increasingly stringent environmental protection regulations around the world, paint manufacturers pay special attention to the volatile organic compound (VOC) content of paint, so water-soluble alkyd resin paint has gradually become a research hotspot. [0003] The water-based alkyd resin mainly includes the salt-forming method, the non-ionic group met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/58C08G81/00C08G59/16C08G63/49C09D151/08
Inventor 涂伟萍赵庆玲王锋胡剑青
Owner SOUTH CHINA UNIV OF TECH
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