Preparation method of zinc oxide-hydroxyapatite composite anticorrosive pigment

A hydroxyapatite and anti-corrosion pigment technology, applied in anti-corrosion coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc. Additional performance effects

Active Publication Date: 2022-03-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the corrosion resistance of HAP is poor

Method used

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  • Preparation method of zinc oxide-hydroxyapatite composite anticorrosive pigment
  • Preparation method of zinc oxide-hydroxyapatite composite anticorrosive pigment

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preparation example Construction

[0019] A method for preparing a zinc oxide-hydroxyapatite composite anticorrosion pigment, characterized in that nano-scale flaky zinc oxide is synthesized on flaky hydroxyapatite by a hydrothermal in-situ composite method, comprising the following steps:

[0020] (1) Add calcium chloride powder and urea to the disodium hydrogen phosphate dodecahydrate solution, carry out hydrothermal reaction in the reactor after ultrasonic mixing, and obtain flaky hydroxyapatite powder through washing and drying;

[0021] (2) Stir the hydroxyapatite powder in deionized water evenly, add zinc acetate dihydrate and sodium hydroxide in turn, and ultrasonically mix evenly, carry out hydrothermal reaction in a reactor, wash and dry to obtain zinc oxide-hydroxyapatite Composite anti-corrosion pigments.

[0022] Wherein, the mass ratio of disodium hydrogen phosphate dodecahydrate and calcium chloride described in step (1) is 1:1.5~1.7, and urea is added to adjust the pH to be 8~10; the temperature ...

Embodiment 1

[0027] Preparation of zinc oxide-hydroxyapatite composite anti-corrosion coating, the specific steps are as follows:

[0028] 1. Preparation of Zinc Oxide-Hydroxyapatite Composite Anticorrosion Pigment

[0029] (1) Preparation of flaky hydroxyapatite (HAP)

[0030] Mix disodium hydrogen phosphate dodecahydrate and calcium chloride at a mass ratio of 1:1.67, add urea as a pH regulator, adjust the pH value of the solution to 9, and ultrasonically uniformly mix the solution and pour it into a reaction kettle. The hydrothermal reaction was carried out at ℃ for 6 hours, and the synthesized product was washed by centrifugation after the reaction. The washed synthetic product was dried at 100° C. for 2 h to obtain flaky hydroxyapatite powder.

[0031] (2) Preparation of Zinc Oxide-Hydroxyapatite (ZnO-HAP) Composite Anticorrosion Pigment

[0032] Take 0.2g of hydroxyapatite powder and stir evenly in deionized water, add 2.158g of zinc acetate dihydrate in proportion during the stir...

Embodiment 2

[0037] Preparation of zinc oxide-hydroxyapatite composite anti-corrosion coating, the specific steps are as follows:

[0038] 1. Preparation of Zinc Oxide-Hydroxyapatite Composite Anticorrosion Pigment

[0039] (1) Preparation of flaky hydroxyapatite

[0040] Mix disodium hydrogen phosphate dodecahydrate and calcium chloride at a ratio of 1:1.67, add urea as a pH regulator, adjust the pH value of the solution to 9, ultrasonically homogenize the mixed solution and pour it into the reaction kettle, at 180°C The hydrothermal reaction was carried out for 6 hours, and the synthesized product was washed by centrifugation after the reaction. The washed synthetic product was dried at 100° C. for 2 h to obtain flaky hydroxyapatite powder.

[0041](2) Preparation of Zinc Oxide-Hydroxyapatite Composite Anticorrosion Pigment

[0042] Take 0.35g of hydroxyapatite powder and stir evenly in deionized water. During the stirring process, add 1.753g of zinc acetate dihydrate in proportion to...

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Abstract

The invention relates to a preparation method of a zinc oxide-hydroxyapatite composite anticorrosive pigment, which comprises the following steps: adding calcium chloride powder and urea into a disodium hydrogen phosphate dodecahydrate solution, ultrasonically mixing uniformly, carrying out hydrothermal reaction in a reaction kettle, washing and drying to obtain flaky hydroxyapatite powder; the preparation method comprises the following steps: uniformly stirring hydroxyapatite powder in deionized water, sequentially adding zinc acetate dihydrate and sodium hydroxide, ultrasonically mixing uniformly, carrying out hydrothermal reaction in a reaction kettle, washing and drying to obtain the zinc oxide-hydroxyapatite composite anticorrosive pigment. According to the invention, nano-zinc oxide and hydroxyapatite are compounded into the anti-corrosion pigment, so that the problems that a nano-zinc oxide coating is easy to fall off and a hydroxyapatite coating is poor in anti-corrosion performance are solved, the adhesion performance of the coating and metal is improved, the porosity of the coating is reduced, chloride ions are cured, and synergistic corrosion prevention is realized.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings, in particular to a preparation method of a zinc oxide-hydroxyapatite composite anti-corrosion pigment. Background technique [0002] Metals exposed to the environment are easily damaged by corrosion and dirt, causing serious losses, especially in marine environments, where metal corrosion protection is even more difficult. Anti-corrosion coating is an effective means to prevent metal corrosion. At present, the metal anti-corrosion coatings mainly used at home and abroad are organic coatings. Chinese invention patent "A Waterborne Epoxy Resin Coating and Its Preparation Method" (CN1415680 A) discloses a waterborne epoxy resin coating composed of two components, an epoxy resin emulsion and a waterborne epoxy resin curing agent, and its preparation method. However, organic anti-corrosion coatings have problems such as easy aging of the coating and low bonding strength between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D163/00C09D175/04
CPCC09D5/084C09D163/00C09D175/04C08K2003/2296C08K2003/325C08L75/04C08K3/22C08K3/32C08L63/00
Inventor 徐晓虹王华丽吴建锋宋佳
Owner WUHAN UNIV OF TECH
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