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Preparation method of poly(2-aminothiazole) modified graphene and epoxy composite coating

A technology of aminothiazole and composite coatings, applied in the direction of epoxy resin coatings, graphene, anti-corrosion coatings, etc., can solve the problem of poor stability of modified graphene, poor corrosion resistance of coatings, and affecting the comprehensive performance of coating films, etc. problems, to achieve the effect of self-cleaning current conduction, reducing conductivity, and reducing conductivity

Active Publication Date: 2020-11-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN103865298B adopts a two-step oxidation method to prepare graphene oxide, and then uses m-phenylenediamine to aminate its surface, thereby improving the fusion and dispersion between graphene and polymer, and enhancing the epoxy coating. Mechanical properties, but there are a lot of oxygen-containing functional groups in this modified coating, which leads to poor corrosion resistance of the coating
Non-covalently modified graphene will not destroy the structure of graphene itself when introducing functional groups, thus retaining the excellent properties of graphene. Chinese invention patent specification CN109651927A discloses poly(2-aminothiazole) / graphene- Epoxy composite coating and its preparation method, first obtain poly(2-aminothiazole) through polymerization reaction and then modify it, it utilizes the π-π interaction force between graphene and poly(2-aminothiazole), in organic solvent Ultrasonic vibration is carried out in the medium, and its preparation method is relatively complicated. In this method, only few-layer poly(2-aminothiazole)-functionalized graphene sheets can be obtained, and only the structure of aminothiazole intercalation into graphene can be obtained. , the poly(2-aminothiazole) cannot be adsorbed on the surface of graphene uniformly and relatively completely. In some extremely strong environmental media or under external forces, the stability of modified graphene is not good. Poly(2- Aminothiazole) and graphene are easy to separate, which ultimately affects the overall performance of the subsequent modified coating film

Method used

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  • Preparation method of poly(2-aminothiazole) modified graphene and epoxy composite coating
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  • Preparation method of poly(2-aminothiazole) modified graphene and epoxy composite coating

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Embodiment 1

[0050] The preparation method of P-TA@RGO that can enhance the corrosion resistance of epoxy coatings, the specific steps are as follows:

[0051] (1) Preparation of graphene oxide (GO): Graphene oxide (GO) was prepared by the improved Hummers method;

[0052] (2) Preparation of reduced graphene oxide (RGO): Take 0.25 g of graphene oxide (GO) prepared in step (1) and add it to a round bottom flask filled with 100 ml of deionized water. Stir under magnetic force for 10 hours, then sonicate for 1.5 hours under the condition of 300w power, then slowly add ammonia water to the solution under mechanical stirring, adjust the pH value of the solution to 7.0, then add 1.8g vitamin C to the mixture in solution; subsequently, in N 2 Under the atmosphere state, reflux reaction at 90°C for 24 hours; after the reaction, the mixture was centrifuged to obtain the precipitate, which was washed with deionized water and ethanol several times until the filtrate pH=7.0 (±0.5), and finally freeze...

Embodiment 2

[0062] The preparation method of P-TA@RGO that can enhance the corrosion resistance of epoxy resin, the specific steps are as follows:

[0063] (1) Preparation of graphene oxide (GO): Graphene oxide (GO) was prepared by the improved Hummers method;

[0064] (2) Preparation of reduced graphene oxide (RGO): Take 0.4 g of graphene oxide (GO) prepared in step (1) and add it to a round bottom flask filled with 200 ml of deionized water. Stir under magnetic force for 12 hours, then sonicate under the condition of 300w power for 2 hours, then slowly add ammonia water to the solution under mechanical stirring, adjust the pH value of the solution to 7.0, then add 4.0g of sodium citrate to the in the mixed solution; subsequently, in N 2 Under the atmosphere state, reflux reaction at 90°C for 24 hours; after the reaction, the mixture was centrifuged to obtain the precipitate, and washed several times with deionized water and ethanol in turn until the filtrate pH = about 7.0, and finally...

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Abstract

The invention relates to a preparation method of poly(2-aminothiazole) modified graphene and an epoxy coating, and the preparation method comprises the following steps: providing reduced graphene oxide, and dispersing the reduced graphene oxide in 1,4-dioxane to obtain a dispersion liquid, wherein the mass concentration of the reduced graphene oxide in the dispersion liquid is 0.1-10 mg / mL; undera stirring state, adding 2-aminothiazole and an initiator into the dispersion liquid obtained in the S2, carrying out a reflux reaction for 20-28 h in an inert atmosphere at a temperature of 70-90 DEGC after the reactants are fully dissolved, then carrying out solid-liquid separation to obtain a solid-phase substance, and carrying out alcohol washing and drying on the solid-phase substance to obtain the poly(2-aminothiazole) modified graphene. The poly(2-aminothiazole) modified graphene prepared by the invention can be well dispersed in epoxy resin as a filler, and can also be used as a curing agent to generate strong interaction force with an epoxy resin matrix, so that the conductivity of an epoxy graphene-based coating is effectively reduced, and the overall performance, especially thecorrosion resistance, of the coating is improved.

Description

technical field [0001] The invention belongs to the field of new chemical materials, and relates to a preparation method of poly(2-aminothiazole) modified graphene and an epoxy composite coating. Background technique [0002] Graphene has excellent electrical and thermal conductivity, and its electron mobility is as high as 200,000 cm 2 ·V -1 ·S -1 , which is 1 / 300 of the speed of light, and far greater than the movement speed of electrons in general conductors; the thermal conductivity is as high as 5300 W / (m K), which is more than 10 times higher than that of common metals such as Au, Ag, Cu, etc. Graphene is the crystalline material with the highest strength and hardness among known crystalline materials, its Young's modulus is as high as 1100 GPa, and its strength limit is 42 N / m 2 , the breaking strength is as high as 130 GPa. In addition, graphene has excellent hydrophobic and oleophobic properties, and its specific surface area is as high as 2630m 2 / g, good t...

Claims

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Application Information

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IPC IPC(8): C09C1/46C09C3/08C09D163/00C09D7/62C09D5/08C01B32/19
CPCC09C1/46C09C3/08C09D163/00C09D7/62C09D5/08C01B32/19C08K2201/011C08K9/10C08K3/042
Inventor 刘娅莉罗小虎余喜红陈博朱日龙袁天赐
Owner HUNAN UNIV