Waterborne epoxy ester resin composition and preparation method thereof and water-based paint prepared from same

A technology of epoxy ester resin and composition, applied in the direction of epoxy resin coating, coating, etc., can solve the problems such as excellent water resistance and corrosion resistance of coating film, damage of resin coating film, slow strength of paint film, etc. Improve anti-corrosion and water resistance, excellent anti-corrosion and water resistance, and avoid early damage

Active Publication Date: 2010-10-06
BEIJING JINHWEILI APPLIED CHEM PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is found that the water-based epoxy ester prepared by adding an emulsifier method is difficult to say that the water-resistant and anti-corrosion properties of the coating film are excellent due to the existence of the emulsifier, and its storage stability is usually also a problem.
In order to make the epoxy ester stable and dispersed in water, more hydrophilic groups are usually introduced in the epoxy ester resin when the vinyl modification method is used to prepare the water-based epoxy ester, such as making the resin solid acid value up to 50mgKOH / g, which makes Excellent corrosion resistance of resin coating film becomes a problem
Moreover, due to the slow oxidation and cross-linking speed of fatty acids, the strength speed of the water-based epoxy ester coating film is slow, and it often takes several days for the coating film to reach the target hardness, so the damage of the resin coating film at the initial stage of formation becomes a problem.
[0005] Patent CN101177518A prepares water-based epoxy ester by adding emulsifier method, the storage stability of the obtained water-based epoxy ester is not good, and the strength on the paint film is slow
[0006] Patent CN1374357A uses vinyl modification method to prepare water-based epoxy ester, because more hydrophilic components are introduced, the corrosion resistance of the obtained water-based epoxy ester is not good
[0007] Patent CN1997716A uses glycidyl methacrylate instead of fatty acid to prepare water-based epoxy ester, the obtained water-based epoxy ester has no fatty acid, and the drying speed is fast, but because there is no cross-linking reaction of fatty acid in the film-forming process, the obtained paint Membrane protection performance is not ideal

Method used

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  • Waterborne epoxy ester resin composition and preparation method thereof and water-based paint prepared from same

Examples

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preparation example Construction

[0039] The present inventors found that by changing the preparation process of water-based epoxy ester, a water-based epoxy ester resin composition with stable storage and low solid acid value can be prepared. The preparation process of waterborne epoxy ester is changed to: (1) Vinyl monomer free radical solution polymerization prepares carboxyl-containing water-dispersible vinyl resin (a), its solid acid value is 50-250 mg KOH / g, molecular weight 3000 ~6000. (2) Epoxy resin and fatty acid carry out epoxy ring-opening reaction and prepare epoxy ester resin (b), wherein epoxy resin is excessive 10~100% than fatty acid, make residual a certain amount of epoxy groups on the gained epoxy ester resin group. (3) Add the carboxyl vinyl resin (a) prepared in step (1) into the epoxy ester resin (b), so that the carboxyl group contained in the vinyl resin is the same as the reserved epoxy group on the epoxy ester reaction to obtain a vinyl-modified epoxy ester resin (A). (4) adding a...

Embodiment 1

[0060] This embodiment is intended to demonstrate the preparation method of waterborne epoxy ester resin composition, as follows:

[0061] (1) Add 400g propylene glycol butyl ether into the reaction vessel and stir to heat up; add 100g styrene, 100g methyl methacrylate, 120g butyl acrylate, 60g methacrylic acid, 60g acrylic acid, 5g divinylbenzene, 5gN-isobutyl Oxymethacrylamide and 15g of benzoyl peroxide are mixed and dissolved to make a monomer drop feed, and the monomer drop feed is added dropwise to the reaction vessel when the temperature of the reaction vessel rises to 120-130°C. Keep the reaction temperature at 120-130°C, and add the monomer dropwise for 4-5 hours. After monomer addition, keep warm at 120-130°C for 2 hours, and add 3 g of benzoyl peroxide per hour. After the heat preservation is completed, the temperature is lowered to 60°C and the material is discharged. The weight solid content of the obtained vinyl resin (a) solution is 53%, the acid value of the ...

Embodiment 2

[0068] This embodiment demonstrates the use of different grades of epoxy resins to prepare water-based vinyl modified epoxy ester resin compositions, as follows:

[0069] (1) Add 200g propylene glycol ether into the reaction vessel and stir to heat up; add 100g styrene, 100g methyl methacrylate, 100g butyl acrylate, 30g methacrylic acid, 30g maleic anhydride, 5g ethylene glycol diacrylate, 5g Glycidyl methacrylate and 15 g of benzoyl peroxide are mixed and dissolved to make monomer drop feed, and the monomer drop feed is added dropwise to the reaction vessel when the temperature of the reaction vessel rises to 120-130°C. Keep the reaction temperature at 120-130°C, and add the monomer dropwise for 4-5 hours. After monomer addition, keep warm at 120-130°C for 2 hours, and add 3 g of benzoyl peroxide per hour. After the heat preservation is completed, the temperature is lowered to 60°C and the material is discharged. The weight solid content of the obtained vinyl resin (a) solu...

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Abstract

The invention belongs to the field of water-based paints in chemical industry and provides a waterborne epoxy ester resin composition and a preparation method thereof and a water-based paint prepared from the same. The waterborne epoxy ester resin composition is prepared by the following methods: (1) preparing a carboxyl-containing vinyl polymer (a) by polymerizing vinyl monomer free radicals; (2) performing ring-opening reaction on excessive epoxy group, fatty acid and an epoxy resin to prepare a fatty acid epoxy ester resin (b); (3) adding the (a) into the (b) to make the carboxyl in the (a) react with the epoxy group in the (b) so as to prepare a vinyl modified epoxy ester resin (A); and (4) neutralizing the (A), adding water, and dispersing to obtain the waterborne epoxy ester resin composition. The waterborne epoxy ester resin composition can overcome the defects that the conventional epoxy ester resin has poor corrosion and water resistance, and the speed that the film has intensity is low. The obtained resin composition film has excellent corrosion and water resistance, and both the resin and the paint have excellent storage stability; the resin film has good dryness, and the speed that the film has the intensity is high; and the paint can be widely applied to the field of metal corrosion resistance.

Description

technical field [0001] The invention relates to a water-based epoxy ester resin composition in the field of chemical water-based coatings, a preparation method thereof and a water-based coating prepared by the composition. Background technique [0002] Due to serious environmental and health problems caused by solvent-based coatings, the use is limited. Environmentally friendly water-based coatings are the current development trend of the coatings industry. The coating films obtained by early water-based coatings have poor corrosion resistance. In order to obtain coating films with good corrosion resistance, people have developed water-based epoxy ester resins, which are widely used in the field of anti-corrosion. [0003] Epoxy esters can be obtained by ring-opening reaction between epoxy resin and organic acid, and then water-based epoxy esters can be obtained by making them water-based. Because the epoxy ester resin prepared by fatty acid and epoxy resin has better film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/10C08G59/14C09D163/10
Inventor 陈鹏
Owner BEIJING JINHWEILI APPLIED CHEM PROD
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