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Water-based rust conversion anticorrosive coating for steel structures, and preparation method thereof

An anti-corrosion coating, rust conversion technology, applied in anti-corrosion coatings, coatings, conjugated diene coatings, etc., can solve the problems of no weather resistance, unstable system, low hardness of the paint film, etc. Corrosion resistance, improve elastic shielding effect, hinder the effect of electron transfer

Active Publication Date: 2020-09-15
洛阳双瑞防腐工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The inventor found through retrieval that Chinese patent CN105062245A discloses a water-based rust conversion coating in which a water-based vinyl chloride-vinylidene chloride-acrylic acid copolymer emulsion is used as a film-forming substance. Rust conversion effect, but it belongs to one-component oxidative drying, the hardness of the paint film is low, and the performance of water resistance and salt spray resistance cannot meet the environment with high corrosion level
[0005] Chinese patent CN109575753A discloses a water-based epoxy anti-corrosion coating for steel surface and its preparation method, using water-based epoxy emulsion as the main film former, adding anti-rust pigments and fillers and pretreated nano-modified particles to prepare an alkaline system The addition of acidic rust conversion agent will lead to the demulsification of epoxy emulsion, the system is unstable, and it has no weather resistance, so it cannot be used outdoors
[0006] Chinese patent CN108822689A discloses a preparation method of water-based polyaniline-modified epoxy cationic emulsion. Through chemical modification method, polyaniline and epoxy resin are connected with covalent bonds to synthesize water-based polyaniline-modified epoxy resin, which has great Good metal anti-corrosion performance and environmental protection, but the molecular weight of the emulsion is synthesized by relatively strong polyaniline and thermosetting epoxy resin, the flexibility of the system cannot meet the requirements of the anti-corrosion system, and cannot meet the requirements of outdoor weather resistance
At the same time, the system cannot be applied to anti-corrosion coatings with rust without rust conversion agent

Method used

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  • Water-based rust conversion anticorrosive coating for steel structures, and preparation method thereof
  • Water-based rust conversion anticorrosive coating for steel structures, and preparation method thereof
  • Water-based rust conversion anticorrosive coating for steel structures, and preparation method thereof

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preparation example Construction

[0053] Described first component water-based epoxy-vinylidene chloride-acrylic acid emulsion, its preparation method comprises the following steps:

[0054] (1) In parts by weight, take 100 parts of epoxy resins in a three-necked flask with an electronic balance, add 7 parts of catalysts, and add 2 parts of polymerization inhibitors and 60 parts of acrylic acid monomers to heat up to Stir and react at 200°C until the theoretical point of acid value is reached, and 50 parts of epoxy-modified acrylic acid intermediates are obtained;

[0055] (2) Add 100 parts of emulsifier and 200 parts of deionized water into the three-necked flask, completely dissolve the emulsifier under the stirring of the rotor, and then add 50 parts of vinylidene chloride monomer and 50 parts of the intermediate obtained in step (1) for stirring and form a pre-emulsion;

[0056] (3) Add 3 parts of initiator into the pressure reaction kettle, pass nitrogen gas for a period of time to exhaust the air in the...

Embodiment 1

[0081] The formulation of a novel water-based rust conversion anticorrosion coating is shown in Table 1.

[0082] Table 1:

[0083]

[0084] The preparation method of coating of the present invention is as follows

[0085] 1. Preparation of component A:

[0086] (1) Add the water-based epoxy-vinylidene chloride-acrylic acid emulsion into the dispersion tank according to the formula amount, and then add the cosolvent ethylene glycol butyl ether, defoamer BYK-028, and water-based rust conversion agent ferrous according to the formula amount Potassium cyanide was dispersed at high speed (800-1000r / min) for 15 minutes to obtain mixture I;

[0087] (2) Under stirring at low speed (300-500r / min), add the raw material of water-based polyaniline elastic nano-modified particles into the mixture I, and disperse at high speed (900-1100r / min) for 10 minutes. After the dispersion is complete, add Organic bentonite and deionized water, after adjusting the viscosity to obtain component...

Embodiment 2

[0093] The formulation of a novel water-based rust conversion anticorrosion coating is shown in Table 2.

[0094] Table 2

[0095]

[0096] The preparation method of coating of the present invention is as follows

[0097] 1. Preparation of component A:

[0098] (1) Add the water-based epoxy-vinylidene chloride-acrylic acid emulsion into the dispersion tank according to the formula amount, and then add the co-solvent dipropylene glycol methyl ether, defoamer BYK-014, and water-based rust conversion agent RC980 according to the formula amount. (800-1000r / min) dispersed for 15 minutes to obtain mixture I;

[0099](2) Under stirring at low speed (300-500r / min), add the raw material of water-based polyaniline elastic nano-modified particles into the mixture I, and disperse at high speed (900-1100r / min) for 10 minutes. After the dispersion is complete, add Xanthan gum and deionized water, after adjusting the viscosity to get component A, just pack according to the proportion; ...

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Abstract

The invention relates to a water-based rust conversion anticorrosive coating for steel structures and a preparation method thereof, and belongs to the technical field of anticorrosive coatings. The water-based rust conversion anticorrosive coating is composed of a component A and a component B in a mass ratio of (5-10): 1; the component A comprises, by weight, 50-80 parts of a water-based epoxy-vinylidene chloride-acrylic emulsion, 5-10 parts of water-based polyaniline elastic nano-modified particles, 10-20 parts of a water-based cosolvent, 2-3 parts of a water-based rust conversion agent, 0.4-1.2 parts of a water-based defoaming agent, 0.2-0.5 part of a water-based thixotropic agent and 10-15 parts of deionized water; and the component B comprises, by weight, 70-100 parts of a water-basedmodified amine curing agent and 0.5-2 parts of a water-based penetrating agent. The coating prepared by the invention has vinylidene chloride resin shielding property and epoxy resin salt spray resistance, and the addition of the water-based polyaniline elastic nano-modified particles improves the corrosion resistance of the coating on the rusty metal surface.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, and in particular relates to a water-based rust conversion anti-corrosion coating for steel structures and a preparation method thereof. Background technique [0002] Steel corrosion is a global problem, and how to effectively prevent corrosion has always been a hot and difficult point in the industry. Every year about 30% of the equipment is scrapped due to corrosion, which not only pollutes the environment, but also wastes a lot of resources and energy consumption. With the development of modern industry, affected by factors such as petroleum resources and environmental protection regulations on volatile organic compounds (VOC) and harmful air pollutants (HAPs), the world's anti-corrosion coating industry is rapidly moving towards "green" while continuously improving its performance. Development in the direction of "chemical" (Wu Ning. Application research on water-based anti-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D151/08C09D179/02C09D109/02C09D133/04C09D109/06C09D5/08C09D7/61C09D7/65C08F283/10C08F214/08
CPCC08F283/105C08K2003/2265C08L2201/08C08L2205/03C08L2205/035C09D5/08C09D151/08C09D7/61C09D7/65C08F214/08C08L79/02C08L9/02C08L33/04C08L9/06C08K3/22
Inventor 魏志龙茹伟峰刘改利
Owner 洛阳双瑞防腐工程技术有限公司
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