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Silane-modified waterborne epoxy double-component zinc-rich paint composition and preparation method thereof

A silane-modified, water-based epoxy resin technology, used in the field of metal paint anti-corrosion, can solve the problems of insufficient water resistance, low VOC content, performance comparison, etc., and achieve good water dispersion stability, long-term anti-corrosion performance, and low VOC value. Effect

Inactive Publication Date: 2017-12-29
HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its performance cannot be compared with solvent-based products. The main performance is insufficient water resistance, so it has rarely made achievements in the field of heavy-duty anti-corrosion.
[0007] The existing water-based two-component epoxy zinc-rich coating products are mainly targeted at: construction machinery shells, freight containers, high-speed rail locomotives, platform oil wells, storage tank facilities, etc. It can be said that the market is extensive, and the reason for the difficulty in promotion is that its performance cannot be compared with Solvent-Based Products Compete
[0008] Although the water-based two-component epoxy zinc-rich coating product has the characteristics of low VOC content and close to solvent-based construction, its performance needs to be further improved

Method used

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  • Silane-modified waterborne epoxy double-component zinc-rich paint composition and preparation method thereof
  • Silane-modified waterborne epoxy double-component zinc-rich paint composition and preparation method thereof
  • Silane-modified waterborne epoxy double-component zinc-rich paint composition and preparation method thereof

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no. 1 approach

[0036] The first embodiment of the present invention firstly provides a silane-modified waterborne epoxy two-component zinc-rich coating composition. The composition is composed of a main agent and a curing agent. The main agent contains a water-based epoxy resin-based resin component.

[0037] The water-based epoxy resin in the present invention can be obtained according to the chemical modification method, which is also called the self-emulsification method, which involves introducing some hydrophilic groups into the epoxy resin molecular chain, or block or graft , so that the epoxy resin obtains self-emulsifying properties. When the modified polymer is emulsified with water, the hydrophobic polymer molecular chains will aggregate into particles, and ionic groups or polar groups are distributed on the surface of these particles. Because they have the same charge and repel each other, as long as certain kinetic conditions are met, a stable water-based epoxy resin emulsion ca...

no. 2 approach

[0058] In this embodiment, the present invention also provides a method for preparing a silane-modified waterborne epoxy two-component zinc-rich coating as described above, comprising the following steps:

[0059] a) The step of mixing other components in the main agent except the anti-sedimentation aid to obtain a mixture;

[0060] b) the step of adding an anti-sedimentation aid;

[0061] c) a step of dispersing the slurry obtained after step b),

[0062] Wherein, in step b), before adding the anti-sedimentation aid, the mixture is heated to above 40°C; in step c), the slurry is dispersed to a particle size below 40 μm.

[0063] According to the above-mentioned preparation method, it is characterized in that, in step a), the mixing is carried out under the stirring condition of 500-700 rpm, and the stirring time is 4-8 minutes.

[0064] In some preferred embodiments of the present invention, the method includes the following steps

[0065] In step a, according to the ratio...

no. 3 approach

[0074] In a third embodiment of the present invention, an article is provided that includes a substrate, and a protective coating formed over the substrate.

[0075] The protective coating may comprise a layer formed according to the coating composition described above in the first embodiment.

[0076] For the protective coating, without limitation, it can be a single coating or multiple coatings. The layer formed from the coating composition of the present invention may be a primer layer or a surface layer or an intermediate layer.

[0077] As the substrate to be protected, various metals are possible, especially ferrous substrates.

[0078] For the formation method of the above protective coating, it can be carried out according to the formation method of the same city in the art. Typically, spin coating, spray coating, etc. can be used. The thickness of the formed coating is not particularly limited, and may be from 50 μm to 1 mm.

[0079] The protective coating obtaine...

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Abstract

The invention relates to silane-modified waterborne epoxy double-component zinc-rich paint composition and a preparation method thereof. The composition is used for solving the problems that current like products in the market have poor water resistance and attachment and relatively high VOC value and can realize the performance of a solvent-type zinc-rich product. A main agent of the composition is prepared from components in percentage by weight as follows: 15-22% of waterborne epoxy resin, 3%-7% of a waterborne solvent, 0.2%-1% of a defoaming agent, 0.5%-1.5% of a dispersant, 70%-75% of zinc powder, 0.3%-1% of an anti-settling aid and 1%-2% of a waterborne silane coupling agent.

Description

technical field [0001] The invention relates to the field of metal paint anticorrosion, in particular to a silane-modified water-based epoxy two-component zinc-rich paint and a preparation method thereof. Background technique [0002] Zinc-rich paint is the preferred anti-rust primer because it is rich in zinc powder and has a cathodic protection effect on steel substrates. There are currently three main types of zinc-rich primers in the anticorrosion of steel structures: epoxy zinc-rich primers, alcohol-soluble inorganic zinc-rich primers and water-based inorganic zinc-rich primers. [0003] Epoxy zinc-rich primer Epoxy zinc-rich primer is based on epoxy resin and superfine zinc powder is the main anti-rust pigment. The construction of epoxy zinc-rich primer is more convenient than inorganic zinc-rich primer. It has excellent cathodic protection, excellent anti-corrosion performance, fast drying, strong adhesion, good impact and wear resistance, good gas cutting and weldab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/10C09D7/12
CPCC09D163/00C08K2003/0893C08L2205/03C09D5/106C08L75/04C08L91/06C08K3/08C08K5/54C08K5/5435
Inventor 程璐胡中源董立志楚会来
Owner HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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