A preparation method of graphene oxide modified carbon fiber initiated by silane coupling agent-assisted electrophoretic deposition

A silane coupling agent, electrophoretic deposition technology, used in carbon fiber, fiber processing, textiles and papermaking, etc., can solve problems such as increasing the contact area between carbon fiber and resin, reducing the interface properties of composite materials, and adversely affecting the mechanical properties of reinforcements, and achieves improvement. Effects of interfacial shear strength, shortening modification time, increasing reactive sites and effective contact area

Active Publication Date: 2020-06-26
SHANDONG UNIV
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Problems solved by technology

[0005] However, the use of graphene oxide to modify carbon fibers in the prior art will cause the agglomeration of graphene oxide and carbon fibers when grafted, thereby affecting the modification effect, which is not conducive to the retention of the mechanical properties of the reinforced body; it is also not conducive to increasing the carbon fiber and resin. contact area, thereby reducing the interfacial properties of the composite

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  • A preparation method of graphene oxide modified carbon fiber initiated by silane coupling agent-assisted electrophoretic deposition
  • A preparation method of graphene oxide modified carbon fiber initiated by silane coupling agent-assisted electrophoretic deposition
  • A preparation method of graphene oxide modified carbon fiber initiated by silane coupling agent-assisted electrophoretic deposition

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preparation example Construction

[0038] This application provides a method for preparing graphene oxide. Graphene powder, sodium nitrate, concentrated sulfuric acid, and potassium permanganate are mixed and reacted in an ice water bath to obtain mixture A. The mixture A is heated to 35±5°C and reacted for a period of time. Add water, and then increase the temperature to 98±5°C to obtain the mixture B after the reaction. The mixture B is diluted with water and then added with hydrogen peroxide solution for reaction, filtered, washed, and dried to obtain graphene oxide.

[0039] More preferably, the ratio of concentrated sulfuric acid to sodium nitrate is 180:2.5, mL:g, and the mass ratio of graphite powder, sodium nitrate and potassium permanganate is 2:1:6.

[0040] Further preferably, the reaction temperature for obtaining the mixture A is 2±0.5° C., and the reaction time is 1 h.

[0041] More preferably, the reaction time for heating to 35±5°C is 30±5 min, and the reaction time for heating to 98±5°C is 15±5 min.

...

Embodiment 1

[0050] (l) Put the carbon fiber in an acetone solution, react for 24 hours at a constant temperature of 70°C, alternately wash several times with absolute ethanol and deionized water, and then dry the washed carbon fiber at 80°C to a constant weight. Prepare 1% by mass aminopropyltriethoxysilane (APTES) and 0.5% by mass ethanol aqueous solution, hydrolyze at room temperature for 2h, put the dried carbon fiber into the above mixed solution, ultrasonic treatment at 60℃ for 30min, deionize After repeated washing with water and drying treatment at 80°C, the carbon fiber pretreated by the silane coupling agent is obtained to a constant weight.

[0051] (2) Add graphene oxide to deionized water, and ultrasonically treat it for 20 minutes to obtain a graphene oxide aqueous solution with a concentration of 0.03 mg / mL, and adjust the pH value of the deposition solution to pH=10 with potassium hydroxide.

[0052] (3) The graphene oxide aqueous solution obtained in step (2) is added to the el...

Embodiment 2

[0054] (1) Put the carbon fiber in an acetone solution, react for 24 hours at a constant temperature of 70°C, wash it several times with anhydrous ethanol and deionized water alternately, and then dry the washed carbon fiber at 80°C to a constant weight. Prepare an aqueous solution of 2% by mass aminopropyltriethoxysilane (APTES) and 0.5% by mass ethanol, hydrolyze at room temperature for 3 hours, put the dried carbon fiber into the mixed solution, ultrasonically treat at 60°C for 40 minutes, and deionize After repeated washing with water and drying at 80°C, the carbon fiber pretreated with silane coupling agent to a constant weight is obtained. The surface morphology of the obtained carbon fiber is as figure 2 Shown.

[0055] (2) Add graphene oxide to deionized water, and ultrasonically treat it for 30 minutes to obtain a graphene oxide aqueous solution with a concentration of 0.04 mg / mL, and adjust the pH of the deposition solution to pH=9 with potassium hydroxide.

[0056] (3) ...

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Abstract

The invention discloses a preparation method of silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers. The preparation method comprises the following steps: placing desized carbon fibers into an aqueous solution which contains amino propyl triethoxysilane (APTES) and ethanol for hydrolysis amination pretreatment to obtain carbon fibers treated bya silane coupling agent, connecting the carbon fibers treated by the silane coupling agent to a positive electrode of a power supply, connecting a copper sheet to a negative electrode of the power supply, and performing electrophoresis deposition by a graphene oxide aqueous solution used as an electrophoresis deposition solution to obtain the silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers. The preparation method can effectively enhance the interfacial shear strength of a carbon fiber enhanced resin-based composite material, and can beapplied to a surface modification process of homemade carbon fiber.

Description

Technical field [0001] The invention relates to a method for surface modification of carbon fibers, in particular to a method for preparing graphene oxide modified carbon fibers with silane coupling agent assisted electrophoretic deposition. Background technique [0002] Carbon fiber has the characteristics of low density, high specific strength, high specific modulus, high temperature resistance, creep resistance, chemical corrosion resistance, low resistance, high thermal conductivity, and small thermal expansion coefficient. It is an important reinforcement for polymer matrix composites. Composite materials using carbon fiber as reinforcement have been widely used in many fields such as aerospace, construction machinery, electronics, cultural and sports, and biological engineering. However, the surface of the carbon fiber is a chaotic graphite structure, the surface is smooth, and it is chemically inert. It is weakly bonded to the resin matrix, and the active surface area of ​...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/74D06M13/513D06M101/40
CPCD06M11/74D06M13/513D06M2101/40
Inventor 朱波袁晓敏乔琨虞军伟赵圣尧
Owner SHANDONG UNIV
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