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Coated modified zinc powder and preparation method thereof

A zinc powder and modification technology, which is applied in coatings, anti-corrosion coatings, etc., can solve problems such as waste and coating service life not reaching the theoretical value, and achieve the effects of reducing activation energy, reducing over-activation, and simple preparation methods

Active Publication Date: 2022-07-22
HUNAN JINPAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Now studies have shown that a large part of the zinc in the zinc-rich primer is wasted due to excessive activation when a large area of ​​the coating is exposed to corrosive media
This activation period usually lasts about 300 hours in 5% NaCl solution, during which the zinc powder of the coating will be oxidized rapidly, resulting in the service life of the coating often not reaching the theoretical value

Method used

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  • Coated modified zinc powder and preparation method thereof
  • Coated modified zinc powder and preparation method thereof
  • Coated modified zinc powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] The coating modified zinc powder in this embodiment is a zinc powder coated with a nano zinc oxide film, the particle size of the zinc powder is 1200 mesh, and the thickness of the nano zinc oxide film is 10 nm. figure 1 The scanning electron microscope image of the coated modified zinc powder of the present embodiment, through figure 1 It can be seen that the zinc powder is covered by a zinc oxide shell with a thickness of 10 nm.

[0041] The preparation method of the present embodiment is as follows:

[0042] (1) 4g urea and 21g deionized water were prepared into urea solution, and 5g zinc nitrate (containing 3.45g zinc ion) and 20g deionized water were prepared into zinc ion solution;

[0043] (2) Add 0.5 g of surfactant OP-10 into the urea solution, and after stirring evenly, put the urea solution containing the surfactant into the three-necked flask; connect the three-necked flask to the heating device and the vacuuming device; turn on the stirrer , the rotating ...

Embodiment 2

[0050] The coating-modified zinc powder in this embodiment is a zinc powder coated and modified by a nano-zinc oxide film, the particle size of the zinc powder is 1000 mesh, and the thickness of the nano-zinc oxide film is 15 nm.

[0051] The preparation method of the present embodiment is as follows:

[0052] (1) 6g urea and 24g deionized water were prepared into urea solution, and 8g zinc chloride (containing 3.84g zinc ion) and 22g deionized water were prepared into zinc ion solution;

[0053] (2) Add 0.5g of surfactant OE-20 to the urea solution, and after stirring evenly, put the urea solution containing the surfactant into the three-necked flask; connect the three-necked flask to the heating device and the vacuuming device; turn on the stirrer , the rotation speed is 500r / min, and the zinc ion solution is slowly added (the addition process takes 8min); the heating device is turned on, the stirring is continued, the temperature is raised to 90°C, and the reaction is maint...

Embodiment 3

[0057] The coated and modified zinc powder in this embodiment is a zinc powder coated and modified by a nano-zinc oxide film, the particle size of the zinc powder is 1500 mesh, and the thickness of the nano-zinc oxide film is 10 nm.

[0058] The preparation method of the present embodiment is as follows:

[0059] (1) 3.5g of urea and 24g of deionized water were prepared into a urea solution, and 4g of zinc chloride (containing 1.92g of zinc ions) and 22g of deionized water were prepared into a zinc ion solution;

[0060] (2) Add 0.5g of surfactant OE-20 to the urea solution, and after stirring evenly, put the urea solution containing the surfactant into the three-necked flask; connect the three-necked flask to the heating device and the vacuuming device; turn on the stirrer , the rotating speed is 450r / min, and the zinc ion solution is slowly added (the addition process takes 10min); the heating device is turned on, the stirring is continued, the temperature is raised to 80°C,...

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Abstract

The invention discloses coating modified zinc powder and a preparation method thereof, the coating modified zinc powder is zinc powder coated and modified by a nano-zinc oxide film, the granularity of the zinc powder is 1000-2000 meshes, the thickness of the nano-zinc oxide film is 10-30nm, and the invention also discloses the preparation method of the coating modified zinc powder. According to the invention, the activation energy of the zinc powder in large-area contact with a corrosive medium can be reduced, the excessive activation of the zinc powder in the initial stage of corrosion prevention is reduced, the conductivity of the zinc powder is not weakened, and the weather resistance and salt fog resistance of a zinc-rich coating can be enhanced; the preparation method is simple and low in cost.

Description

technical field [0001] The invention relates to a zinc powder and a preparation method thereof, in particular to a modified zinc powder and a preparation method thereof. Background technique [0002] Zinc powder is one of the most commonly used fillers in primer coatings in the field of steel corrosion protection. Primers containing zinc dust are generally referred to as zinc-rich primers. Zinc-rich primers mainly rely on two means of shielding protection and cathodic protection in the anti-corrosion effect of steel. Shielding protection is to isolate the corrosive medium from the steel substrate through the compactness of the coating. Cathodic protection relies on the contact between zinc particles and zinc particles, zinc particles and steel substrates in the coating of zinc-rich primer to form a smooth conductive network, so as to achieve the purpose of electrochemical protection. Therefore, zinc powder is one of the most important fillers that affects the performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/10C09D7/62
CPCC09D5/106C09D7/62
Inventor 廖有为姜孟超廖建春
Owner HUNAN JINPAN NEW MATERIAL TECH CO LTD
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