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Waterborne self-emulsifying epoxy modified alkyd resin and anticorrosive coating thereof

A self-emulsifying epoxy and alkyd resin technology, used in anti-corrosion coatings, polyester coatings, coatings, etc., can solve the problems of narrow application range, complex preparation process and poor storage stability of water-based alkyd resins, and achieve convenient construction. , Good storage stability and strong adhesion

Inactive Publication Date: 2018-09-21
李嘉顺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN102757551A patent utilizes epoxy resin to modify alkyd resin, and the adhesion and hardness of the prepared water-based alkyd resin are significantly improved, but the preparation process of this method is complicated, a large amount of co-solvent is added, and the method of neutralizing the carboxyl group to form a salt leads to Waterborne alkyd resin has problems such as narrow application range and poor storage stability

Method used

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  • Waterborne self-emulsifying epoxy modified alkyd resin and anticorrosive coating thereof

Examples

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Effect test

Embodiment 1

[0028] (1) Preparation of water-based self-emulsifying epoxy-modified alkyd resin

[0029] In reactor, add 300g linolenic acid, 30g pentaerythritol, 100g ethylene glycol, 20g neopentyl glycol, molecular weight are 600 polyethylene glycol 100g, 20g benzoic acid, 80g maleic anhydride, 30g trimellitic anhydride and 150g xylene, heat up Carry out esterification reaction at 180-220°C for 6-10 hours, continuously divide water during the reaction, measure the acid value of the reactant, after the acid value reaches 80-150mg KOH / g, add 80g of epoxy resin E51 to the reaction In the material, continue to react for 4-6 hours, measure the acid value continuously during the reaction process, until the acid value reaches < 30mg KOH / g, after the solvent is removed under reduced pressure, the temperature is lowered to 70-80°C, and then 700g of deionized water is added to prepare a solid Self-emulsifying epoxy-modified alkyd resin with a content of about 50% has a white emulsion appearance, an...

Embodiment 2

[0032] (1) Preparation of water-based self-emulsifying epoxy-modified alkyd resin

[0033] Add 300g linolenic acid, 30g trimethylolpropane, 100g ethylene glycol, 20g neopentyl glycol, 100g polyethylene glycol monomethyl ether with a molecular weight of 600, 20g benzoic acid, 80g maleic anhydride, 30g Trimellitic anhydride and 150g xylene, heated up to 180-220°C, carried out esterification reaction for 6-10 hours, water was continuously separated during the reaction, and the acid value of the reactant was measured. After the acid value reached 80-150mg KOH / g, 100g Epoxy resin E51 was added to the reactant, and the reaction was continued for 4-6 hours. During the reaction, the acid value was continuously measured until the acid value reached < 30mg KOH / g. 750g of deionized water to prepare a self-emulsifying epoxy-modified alkyd resin with a solid content of about 45%. The appearance is a white emulsion. The prepared resin does not precipitate or delaminate during heat storage (...

Embodiment 3

[0036] (1) Preparation of water-based self-emulsifying epoxy-modified alkyd resin

[0037] Add 350g oleic acid, 30g trimethylolpropane, 80g ethylene glycol, 20g neopentyl glycol, molecular weight 800 polyethylene glycol monomethyl ether 100g, 20g benzoic acid, 70g maleic anhydride, 25g trimellitic anhydride in the reaction kettle And 150g xylene, warming up to 180-220°C, carry out esterification reaction for 6-10 hours, continuously divide water during the reaction, measure the acid value of the reactant, after the acid value reaches 80-150mg KOH / g, 70g ring Add oxygen resin E51 to the reactant and continue to react for 4-6 hours. During the reaction, measure the acid value continuously until the acid value reaches < 30mg KOH / g. After removing the solvent under reduced pressure, cool down to 70-80°C and then add 750g Deionized water is used to prepare a self-emulsifying epoxy-modified alkyd resin with a solid content of about 45%. The appearance is a white emulsion. The prepar...

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Abstract

The invention discloses waterborne self-emulsifying epoxy modified alkyd resin, a preparation method thereof, and an anticorrosive coating prepared by the epoxy modified alkyd resin, and belongs to the technical field of chemical engineering. According to the epoxy modified alkyd resin, hydrophilic macromolecular chain segments are introduced in an alkyd resin main chain, epoxy resin is grafted tothe alkyd resin, the epoxy modified alkyd resin is prepared through self-emulsifying, the preparation method and technology are simple, the modified resin has self-emulsifying capacity, it is not necessary to add emulsifier and amine for salifying, and the epoxy modified alkyd resin has good storage stability, better physical property and better corrosion resistance property. When the prepared resin is applied to steel-structure protective undercoat, the prepared coating does not contain volatile organic matters and is more environmentally friendly, the construction is safe, and the comprehensive performance of coatings is better.

Description

technical field [0001] The invention designs a water-based environment-friendly alkyd resin coating, in particular to a self-emulsifying epoxy-modified alkyd resin and a preparation method thereof. Background technique [0002] Alkyd resin coatings have the advantages of cheap and easy-to-obtain raw materials, good coating adhesion, brightness, fullness, good wetting performance to pigments and fillers, etc., and have good construction properties, and are widely used in the protection of various steel structures. middle. However, in recent years, with the development of the paint industry and coating towards low pollution, water-based alkyd coatings are receiving increasing attention and research. [0003] The preparation methods surrounding water-based alkyd resins mainly include mechanical methods, acid neutralization and salt formation and self-emulsification methods. The mechanical method prepares water-based alkyd resin emulsion by adding an emulsifier and high-speed ...

Claims

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Application Information

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IPC IPC(8): C09D167/08C09D5/08C08G63/91C08G63/676C08G63/78
CPCC08G63/676C08G63/78C08G63/918C08K2003/3045C08K2003/327C08K2003/328C09D5/08C09D167/08C08L75/04C08K13/02C08K3/32C08K3/34C08K3/30
Inventor 李嘉顺
Owner 李嘉顺
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