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Preparation method of silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers

A silane coupling agent, electrophoretic deposition technology, applied in the direction of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of increasing the contact area between carbon fiber and resin, reducing the interface performance of composite materials, and unfavorable reinforcement mechanical properties, etc., to achieve improvement Effects of interfacial shear strength, shortening modification time, increasing reactive sites and effective contact area

Active Publication Date: 2018-07-17
SHANDONG UNIV
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  • Application Information

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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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  • Preparation method of silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers
  • Preparation method of silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers
  • Preparation method of silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers

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preparation example Construction

[0038] This application provides a method for preparing graphene oxide. In an ice-water bath, graphite powder, sodium nitrate, concentrated sulfuric acid and potassium permanganate are mixed and reacted to obtain a mixture A, and the temperature of the mixture A is raised to 35±5°C for a period of time. Add water, then raise the temperature to 98±5°C and react to obtain a mixture B, dilute the mixture B with water, add hydrogen peroxide solution to react, filter, wash, and dry to obtain graphene oxide.

[0039] Further 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] Further preferably, the reaction time for raising the temperature to 35±5°C is 30±5 minutes, and the reaction time for raising the temperature to 98±5°C...

Embodiment 1

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

[0051] (2) Graphene oxide was added into deionized water, and ultrasonically treated for 20 minutes to obtain a graphene oxide aqueous solution with a concentration of 0.03 mg / mL, and the pH value of the deposition solution was adjusted to pH=10 with potassium hydroxide.

[0052] (3) Add the graphene oxide aqueous solution obtained in step (2) into t...

Embodiment 2

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

[0055] (2) Graphene oxide was added into deionized water, and ultrasonically treated for 30 minutes to obtain a graphene oxide aqueous solution with a concentration of 0.04 mg / mL, and the pH value of the depositi...

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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 initiated by 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 electrical resistance, high thermal conductivity, and small thermal expansion coefficient. It is an important reinforcement of polymer matrix composites. Composite materials using carbon fibers as reinforcements have been widely used in many fields such as aerospace, construction machinery, electronics, culture and sports, and bioengineering. However, the surface of carbon fiber has a turbostratic graphite structure, which is smooth and chemically inert. It is weakly bonded to the resin matrix, and the active surface area...

Claims

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Application Information

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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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