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Nanosheet composite coating as well as preparation method and application thereof

A composite coating and nanosheet technology, applied in the field of coatings, can solve problems such as coating shrinkage, coating life shortening, and weakening coating resistance to corrosive media, etc., to extend the path, ensure isolation effect, and good physical barrier effect Effect

Active Publication Date: 2021-11-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional solvent-based and water-based anti-corrosion coatings usually contain a large amount of solvents, so coating shrinkage, cracking and internal defects caused by solvent volatilization during the coating curing process are inevitable
These inherent problems can seriously weaken the resistance of the coating to corrosive media, resulting in a greatly shortened coating life
On this basis, adding nano-sheets such as graphene to the organic coating can effectively delay the corrosive medium from reaching the metal surface, thereby achieving high-efficiency corrosion protection. However, nano-sheets such as graphene are easy to agglomerate, and they need to be dispersed efficiently to exert their full effect. At present, there is still a lack of corresponding efficient decentralized technology

Method used

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  • Nanosheet composite coating as well as preparation method and application thereof
  • Nanosheet composite coating as well as preparation method and application thereof
  • Nanosheet composite coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An embodiment of the nanosheet composite coating and its preparation method and application according to the present invention, the preparation method of the nanosheet composite coating comprises the following steps:

[0037] (1) Add 25 mg of boron nitride powder, a two-dimensional nanosheet material with a size of 0.5 to 50 μm, and 0.1 g of urushiol into 2.5 g of xylene, and obtain a boron nitride nanosheet dispersion after ultrasonic treatment for 4 hours;

[0038] (2) Add 10g of E44 epoxy resin to the nanosheet dispersion, and stir it evenly by mechanical stirring; finally add 8g of polyamide 650 curing agent, stir for 5 minutes and quickly put it into the defoamer, set the speed to 1500r / min, vacuum degree is 95.8kPa and defoaming 15min, promptly obtains described nanosheet composite coating.

[0039] The metal product used in this example is a Q235 carbon steel sheet with a specification of 5cm×5cm×1mm. The surface of the carbon steel sheet is polished with 180-me...

Embodiment 2

[0045] An embodiment of the nanosheet composite coating and its preparation method and application in the present invention, the difference between this embodiment and Example 1 is that the two-dimensional nanosheet material is graphene with a size of 0.5-50 μm.

[0046] Application and testing are carried out to the nano sheet composite coating obtained in this embodiment, and described application and testing method are with embodiment 1, and test result is as follows figure 2 shown.

[0047] from figure 2 It can be seen that the coating of pure epoxy resin coating is soaked in 3.5wt% NaCl aqueous solution for 50 days |Z| f＝0.01Hz is 4.096×10 7 Ω·cm 2 , urushiol-modified boron nitride nanosheet / organic composite coating after soaking in 3.5wt% NaCl aqueous solution for 50 days |Z| f＝0.01Hz is 1.056×10 10 Ω·cm 2 , significantly improving the corrosion resistance of the coating.

Embodiment 3

[0049] An embodiment of the nanosheet composite coating and its preparation method and application in the present invention, the difference between this embodiment and Example 1 is that the two-dimensional nanosheet material is tungsten disulfide with a size of 0.5-50 μm.

[0050] Application and testing are carried out to the nano sheet composite coating obtained in this embodiment, and described application and testing method are with embodiment 1, and test result is as follows image 3 shown.

[0051] from image 3 It can be seen that the coating of pure epoxy resin coating is soaked in 3.5wt% NaCl aqueous solution for 50 days |Z| f＝0.01Hz is 4.096×10 7 Ω·cm 2 , urushiol-modified boron nitride nanosheet / organic composite coating after soaking in 3.5wt% NaCl aqueous solution for 50 days |Z| f＝0.01Hz is 1.085×10 10 Ω·cm 2 , significantly improving the corrosion resistance of the coating.

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Abstract

The invention discloses a nanosheet composite coating, and belongs to the field of coatings. In the raw material components of the product, urushiol is used as a modifier to anchor and synergistically strip two-dimensional nanosheets, so that the two-dimensional nanosheets are effectively dispersed, the modified nanosheets can play a good physical barrier role when the coating is used, and the path of a corrosive medium entering the coating is greatly prolonged; in addition, an alkyl chain structure contained in urushiol can also provide a hydrophobic surface for a nanosheet composite coating product, so that water molecules are difficult to permeate easily; and catechol groups contained in urushiol can effectively passivate the protected metal and alloy, so that a compact oxidation film is formed on the surface of the metal and alloy, and the metal substrate is effectively protected. The invention further discloses a preparation method and application of the nanosheet composite coating.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a nanosheet composite coating and its preparation method and application. Background technique [0002] Corrosion phenomenon can be seen everywhere in our life, it is a typical electrochemical reaction process, when metal material and corrosive medium (H 2 O, O 2 , Cl - , microorganisms, etc.) will have a slow chemical reaction when in contact, which poses a fatal threat to metal materials, which also causes huge economic losses to all walks of life, and a series of major safety accidents have also occurred due to metal corrosion: For example, there have been serious bridge collapses, oil and gas pipeline explosions, nuclear leaks and other major safety accidents due to corrosion, which have seriously affected people's lives, health and property safety. Therefore, it is very meaningful for the country and the people to carry out research on metal corrosion protection. [0003] In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D5/08C09D7/62B05D7/14B05D7/24
CPCC09D163/00C09D5/08C09D7/62C09D7/70B05D7/14B05D7/24C08K2003/385C08K2003/3009C08K2201/011C08K9/04C08K7/00C08K3/38C08K3/042C08K3/30C08K3/02
Inventor 顾林孙九龙
Owner SUN YAT SEN UNIV
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