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An environment-friendly two-component waterborne epoxy zinc-rich special coating composition and its preparation method

A water-based epoxy zinc-rich, coating composition technology, used in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problem of poor resistance to neutral salt spray and salt water, foaming, weakening of zinc powder Cathodic protection, etc.

Active Publication Date: 2021-06-25
广州花都东方雨虹新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] It has been found in engineering practice that although the addition of anti-settling agents, rheological agents and thixotropic agents has improved the problems of settlement and sagging, it has also had a certain impact on the protection of the steel surface by zinc powder. Domestically produced fatty acid amide anti-settling agents Due to its stable performance and low price, it is an anti-settling agent that is widely used in engineering at present. However, when using fatty acid amide anti-settling agents, after long-term exposure to the natural environment, it will be damaged on protrusions, depressions, and corners. Or there are blisters or even obvious red rust on the corners
The reason is that in the same construction process, the rheological properties of the folded edges, corners and edges of the coated steel become poor. According to the analysis, the accumulation of rheological agents and sedimentation agents is easy to occur in these parts. There are more charged amine groups in the amide, which affects the formation of the potential difference between the coating and the steel, thereby weakening the cathodic protection of the zinc powder, which makes the protrusions, depressions and edges of the steel material The neutral salt spray resistance and salt water resistance of corners or corners are deteriorated

Method used

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  • An environment-friendly two-component waterborne epoxy zinc-rich special coating composition and its preparation method
  • An environment-friendly two-component waterborne epoxy zinc-rich special coating composition and its preparation method
  • An environment-friendly two-component waterborne epoxy zinc-rich special coating composition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0055] Embodiment 1-6 concrete proportioning (weight part) is as shown in table 1 below:

[0056] Table 1

[0057]

[0058]

[0059] Stability test:

[0060] 1. According to the ratio of component A in Table 1, add MPA60X rheology agent, T-250 fatty acid amide anti-sedimentation agent and dispersant to 6 container tanks respectively (marked according to the components of Examples 1-6 ), stirring and dispersing at 500-1000 rpm.

[0061] 2. According to the ratio of component A in Table 1, add 800 mesh zinc powder and defoamer to the above 6 containers to obtain component A in the container.

[0062] 3. Fully mix the dissolved epoxy emulsion 6520 and raybo90 anti-flash rust agent according to the ratio of component B in Table 1, and add deionized water to obtain component B.

[0063] 4. Add component B in step 3 to component A in 6 tanks while fully dispersing and stirring, wherein the weight ratio of component A and component B is 4:1.

[0064] 5. After fully stirring a...

Embodiment 7-12

[0081] Spray test 2:

[0082] Table 4

[0083]

[0084] 1. According to the ratio of A component in Table 4, add MPA60X rheological agent, PEDOT, T-250 fatty acid amide anti-settling agent and dispersant to 6 container tanks respectively (according to the components of Examples 7-12 mark), stir and disperse at 500-1000 rpm.

[0085] 2. According to the ratio of component A in Table 1, add 800 mesh zinc powder, 8538-Y-68 amine epoxy curing agent, and defoamer to the above-mentioned 6 containers to obtain component A in the container .

[0086] 3. Fully mix the dissolved epoxy emulsion 6520 and raybo90 anti-flash rust agent according to the ratio of component B in Table 1, and add deionized water to obtain component B.

[0087] 4. Add component B in step 3 to component A in 6 tanks while fully dispersing and stirring, wherein the weight ratio of component A and component B is 4:1, and stir thoroughly for 2-4min until fully blended.

[0088] 5. Add 15-20% water by weight ...

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Abstract

The invention relates to a heavy-duty anti-corrosion coating applied to railways, bridges and ocean engineering, specifically an environment-friendly two-component water-based epoxy zinc-rich special coating composition and a construction method thereof. The two-component water-based epoxy zinc-rich Zinc primer, including water-based epoxy zinc-rich A component and water-based epoxy zinc-rich B component, using a specific ratio of American Hemings company MPA60X rheological agent, PEDOT and Shanghai Ito company T‑250 fatty acid anti-settling Mixed with anti-settling agent, no need to use neutralizing agent, while having good anti-settling and anti-sag effects, it reduces the influence of anti-settling agent on the anti-corrosion effect of the coating composition, and has good construction performance and long-term anti-corrosion performance. It can be stored for a long time without change, will not produce air bubbles and will not agglomerate on the surface; no organic solvents are added to the composition, no pollution to the environment, convenient construction, and harmless to the health of construction workers.

Description

technical field [0001] The invention relates to the field of heavy-duty anti-corrosion coatings in roads, bridges, high-speed rails and ocean engineering, in particular to an environment-friendly two-component water-based epoxy zinc-rich special coating and a preparation method thereof. Background technique [0002] Heavy-duty anti-corrosion coatings are widely used in marine engineering, transportation vehicles, roads and bridges, large venues, ships, petrochemicals, high-speed rail facilities, heavy machinery and wind power equipment, which are mainly steel structures and equipment. Zinc-rich primer is currently It is one of the most widely used and most used types of heavy-duty anti-corrosion coating materials. It has strong corrosion resistance and weather resistance, and can effectively reduce the corrosion of metals. [0003] The standard electrode potential of zinc is -0.76V, and that of iron is -0.44V; zinc is more active than iron. The zinc content in the zinc-rich...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/10C09D7/45
CPCC08K2003/0893C09D5/106C09D163/00C09D7/45C08L65/00C08K3/08C08K5/20
Inventor 黄维东温伟华
Owner 广州花都东方雨虹新型建材有限公司
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