Metal corrosion-resistant composite material coating and preparation method thereof

A composite material, metal anti-corrosion technology, applied in anti-corrosion coatings, coatings, etc., can solve the problem of difficult to adhere to metal substrates, and achieve the effect of preventing metal corrosion, good toughness and strong viscosity

Inactive Publication Date: 2017-09-29

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AI-Extracted Technical Summary

Problems solved by technology

Polymeric coatings have shown potential for corrosion inhib...

Method used

After nano-graphene/polyamic acid mixture is coated in alloy steel at 150 DEG C and solidifies 5min~10min, then after solidifying 5min~10min at 250 DEG C~280 DEG C, PAA takes place in steel surface The modified polyetherimide (chemically referred to as PEI) is generated by the imidization reaction, so that the non-functionalized graphene and multi-walled carbon nanotubes have good dispersion in the final polymer matrix PEI. The modified PEI produced by in-situ polymerization and imidization reaction on the alloy surface can further improve the adhesion with the alloy surface, so that the metal anti-corrosion composite coating can be firmly bonded to the alloy surface, and at the same time combine The excellent water resistance of PEI also helps to significantly improve the anti-corrosion ability of the composite coating system.

As can be seen from table 2, metal anticorrosion composite material coating provided by the invention can significantly prevent the corrosion of alloy steel for a long time. At the same time, comparing Examples 1-3 with Comparative Example 3 and Comparative Example 4, it can be seen that PEI itself and the direct mixing of PEI and graphene cannot play a significant anti-corrosion effect on alloy steel. The composition and preparation method make the prepared metal anti-corrosion composite material coating have significant anti-corrosion effect.

In addition, the π-π interaction between the π-conjugated graphene basal plane in the non-functionalized graphene and the aromatic moiety on the polymer backbone makes the non-functionalized graphene And the multi-walled carbon nanotubes can be better dispersed in the coating system, which helps to prevent the delamination of the metal anti-corrosion composite coating and the metal surface, improves the stability of the metal anti-corrosion composite coating, and helps A passivation layer is formed on the surface to further improve the stability and anti-corrosion perf...

Abstract

The invention provides a metal corrosion-resistant composite material coating and a preparation method thereof. The preparation raw materials of the metal corrosion-resistant composite material coating comprise graphite powder, anhydride, diamine and N-methyl pyrrolidone. The prepared metal corrosion-resistant composite material coating obtained by combining graphene made from the graphite powder with polyetherimide generated by anhydride and diamine is high in viscidity and can be firmly combined with the surface of a metal. The coating is good in toughness, hard to break and high in corrosion resistance, has the remarkable characteristic of effectively preventing metal corrosion, is low in toxicity and has high practicality and application prospect.

Application Domain

Anti-corrosive paints

Technology Topic

Cvd grapheneDiamine +10

Image

Examples

Experimental program(3)
Comparison scheme(4)
Effect test(1)

Example Embodiment

[0049] Embodiment 1 adopts following preparation method:

[0050] S100, mixing and stirring 15 parts of graphite powder in 22 parts of N-methylpyrrolidone;

[0051] S200, performing ultrasonic exfoliation on the mixture in S100 to obtain non-functionalized nano-graphene;

[0052] S300, adding 16 parts of acetic anhydride and 16 parts of m-phenylenediamine to the non-functionalized graphene obtained in S200, after ultrasonic treatment at 80°C to 100°C for 5 minutes, mixing and stirring for 0.5h to 2.0h to carry out in-situ polymerization, After in-situ polymerization of acid anhydride and diamine to generate polyamic acid, a nano-graphene/polyamic acid mixture is obtained;

[0053] S400, the nanographene/polyamic acid mixture that S300 is obtained is evenly coated on the alloy steel surface of cleaning;

[0054] S500. After curing the alloy steel coated with nano-graphene/polyamic acid mixture at 150°C for 5 minutes to 10 minutes, and then curing at 250°C to 280°C for 5 minutes to 10 minutes, the coating of the metal anti-corrosion composite material is completed. preparation.

Example Embodiment

[0055] Embodiment 2 adopts following preparation method:

[0056] S100, mixing and stirring 22 parts of graphite powder in 20 parts of N-methylpyrrolidone;

[0057] S200, performing ultrasonic exfoliation on the mixture in S100 to obtain non-functionalized nano-graphene;

[0058] S300. Add 18 parts of phthalic anhydride and 20 parts of triethylenediamine to the non-functionalized graphene obtained in S200, and add 15 parts of multi-walled carbon nanotubes. After ultrasonic treatment at 80°C to 100°C for 5 minutes , mixing and stirring for 0.5h to 2.0h to carry out in-situ polymerization, wherein the acid anhydride and diamine are in-situ polymerized to form polyamic acid, and then the nano-graphene/polyamic acid mixture is obtained;

[0059] S400, the nanographene/polyamic acid mixture that S300 is obtained is evenly coated on the alloy steel surface of cleaning;

[0060] S500. After curing the alloy steel coated with nano-graphene/polyamic acid mixture at 150°C for 5 minutes to 10 minutes, and then curing at 250°C to 280°C for 5 minutes to 10 minutes, the coating of the metal anti-corrosion composite material is completed. preparation.

Example Embodiment

[0061] Embodiment 3 adopts following preparation method:

[0062] S100, mixing and stirring 25 parts of graphite powder in 32 parts of N-methylpyrrolidone;

[0063] S200, performing ultrasonic exfoliation on the mixture in S100 to obtain non-functionalized nano-graphene;

[0064] S300, adding 18 parts of diphenyl ether dianhydride and 18 parts of m-phenylenediamine to the non-functionalized graphene obtained in S200, and adding 15 parts of multi-walled carbon nanotubes, and ultrasonically treating at 80°C to 100°C for 5 minutes Afterwards, mix and stir for 0.5h to 2.0h for in-situ polymerization, in which acid anhydride and diamine are in-situ polymerized to form polyamic acid, then add 3 to 5 parts of m-phenylenediamine for stirring to obtain nano-graphene/polyamide Acid PAA mixture;

[0065] S400, the nanographene/polyamic acid mixture that S300 is obtained is evenly coated on the alloy steel surface of cleaning;

[0066] S500. After curing the alloy steel coated with nano-graphene/polyamic acid mixture at 150°C for 5 minutes to 10 minutes, and then curing at 250°C to 280°C for 5 minutes to 10 minutes, the coating of the metal anti-corrosion composite material is completed. preparation.

PUM

Property	Measurement	Unit
Current density	0.0000366	a/cm²
Current density	0.0000323	a/cm²

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

strong stickiness
good toughness

Metal corrosion-resistant composite material coating and preparation method thereof

A composite material, metal anti-corrosion technology, applied in anti-corrosion coatings, coatings, etc., can solve the problem of difficult to adhere to metal substrates, and achieve the effect of preventing metal corrosion, good toughness and strong viscosity

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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