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Waterborne epoxy/acrylic resin emulsion with core-shell structure as well as preparation method and application thereof

An acrylic resin, water-based epoxy technology, applied in coatings, anti-corrosion coatings, etc., can solve the problems of poor film flexibility, impact resistance and corrosion resistance, prone to brittle fracture, low molecular weight, etc., to improve adhesion. ability, improved water dispersibility, high gloss effect

Active Publication Date: 2015-07-22
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating has excellent mechanical properties, water resistance, and corrosion resistance. However, due to the relatively low molecular weight of the epoxy resin prepared in this patent, the resulting paint film has poor flexibility, impact resistance, and corrosion resistance. It is prone to brittle fracture and can only be used for metal surface structures with lower requirements. It cannot fully meet the urgent needs of high-performance water-based epoxy anti-corrosion coatings and wetting agent technology.

Method used

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  • Waterborne epoxy/acrylic resin emulsion with core-shell structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of modified epoxy resin: put 136.2g of E-20 epoxy resin, 22.2g of phthalic anhydride and 0.41g of dimethylethylenediamine into reactor A, stir and slowly heat up To 130°C, detect the acid value during the reaction, when the acid value is <8mg KOH / g, it is the end of the reaction. Then, add 33g of capric acid and lower the temperature to 120°C to start esterification, keep the temperature of esterification reaction at 115-120°C, condense and reflux, and stop the reaction after reacting for 1.5-4 hours.

[0028](2) Preparation of the epoxy / acrylic amino resin emulsion of core-shell structure: add the α-methylstyrene monomer of 12.5g and the benzoyl peroxide (BPO) of 4.1g in the reactor B, use 40g propylene glycol Dissolve the methyl ether, raise the temperature to 70°C, wait until the BPO is completely dissolved, then mix 45g of acrylic acid, 35g of methacrylic acid and 0.2g of hydroquinone evenly, and slowly add them into the reactor B by dropping. After...

Embodiment 2

[0031] (1) Preparation of modified epoxy resin: the E-12 epoxy resin of 100g, the E-44 epoxy resin of 31g, the tetrahydrophthalic anhydride of 47g and the tris (2-hydroxyethyl) amine drop into reaction of 0.3g Reactor A is subjected to ring-opening reaction, stirred and slowly heated up to a reaction temperature of 130°C, and the end point of the reaction is when the acid value is less than 8 mg KOH / g. Then, add 28g of ricinoleic acid to carry out esterification reaction, react for 3 hours, and keep the temperature at 105°C.

[0032] (2) Preparation of epoxy / acrylic acid amino resin emulsion of core-shell structure: add 15g of styrene and 0.9g of benzoyl peroxide (BPO) in reactor B, dissolve with 20g propylene glycol methyl ether, be warming up to 70 ℃, after the BPO is completely dissolved, then mix 60g of acrylic acid, 30g of methyl methacrylate, 0.15g of p-benzoquinone and 20g of propylene glycol methyl ether, and slowly add it to the reactor B by dropping. After the dropw...

Embodiment 3

[0035] (1) Preparation of modified epoxy resin: the E-20 epoxy resin of 100g, the E-44 epoxy resin of 31g, the maleic anhydride of 47g and the ethylenediamine amine of 0.3g drop into reactor A to carry out For the ring-opening reaction, stir and slowly heat up to a reaction temperature of 130°C. When the acid value is less than 8mg KOH / g, it is the end of the reaction. Then, add 28g of oleic acid to carry out esterification reaction, react for 3 hours, and keep the temperature at 105°C.

[0036] (2) Preparation of epoxy / acrylic acid amino resin emulsion of core-shell structure: add 15g of styrene and 0.9g of benzoyl peroxide (BPO) in reactor B, dissolve with 20g propylene glycol methyl ether, be warming up to 70 ℃, after the BPO is completely dissolved, then mix 60g of acrylic acid, 30g of methyl methacrylate, 0.15g of p-benzoquinone and 20g of propylene glycol methyl ether, and slowly add it to the reactor B by dropping. After the dropwise addition, the temperature was raise...

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Abstract

The invention discloses a waterborne epoxy / acrylic resin emulsion with a core-shell structure as well as a preparation method and application of the waterborne epoxy / acrylic resin emulsion as a waterborne epoxy / acrylic amino baking paint. The method comprises the following steps: performing graft copolymerization reaction on the prepolymer of acrylic monomer and vinyl monomer and a modified epoxy resin under the effect of a solvent, emulsifying to obtain the epoxy / acrylic amino resin emulsion with the core-shell structure with the solid content of 20-30%; mixing the following components in parts by weight: 100 parts of the epoxy / acrylic resin emulsion with the core-shell structure, 90-200 parts of water, 90-200 parts of waterborne curing agent and 0.01-0.5 part of waterborne adjuvant. The environment-friendly waterborne epoxy / acrylic amino baking paint with high paint film mechanical strength can be obtained to substitute the solvent type epoxy paint as a base coat. The waterborne epoxy / acrylic resin emulsion is wide in application scope, suitable for the protective coating of the metal frame structures such as a circuit coil, a PCB and a building automobile in the electronic field.

Description

technical field [0001] The invention relates to a water-based epoxy / acrylic resin emulsion with a core-shell structure, a preparation method thereof and application as a water-based epoxy / acrylic amino baking varnish, belonging to the field of organic chemistry. Background technique [0002] Traditional anti-corrosion paints are mostly solvent-based paints, covering alkyd, acrylic, phenolic, polyurethane, epoxy and other varieties. However, because these types of paints contain a large amount of organic solvents, the solvents will volatilize into the atmosphere during construction, which is harmful to the health of construction workers and pollutes the environment. In recent years, with the continuous enhancement of public environmental awareness, the world The environmental protection regulations of various countries have increasingly strict restrictions on the content of volatile organic compounds (VOC) in coatings, and the coatings industry is developing in the direction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F220/06C08F220/14C08F212/12C08F212/08C09D151/08C09D5/08
Inventor 张先正程翰曾旋冯俊
Owner WUHAN UNIV
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