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Carbon fiber/silica hybrid material and preparation method thereof

A hybrid material, silica technology, applied in carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of matrix material combination, the effect is not obvious, etc., to increase the specific surface area, increase adsorption, improve grafting rate effect

Active Publication Date: 2017-07-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbon fiber has many excellent characteristics, but due to its smooth surface, it is difficult to combine well with the matrix material, and the dispersion of the fiber in the matrix is ​​also an important problem to be solved
At present, there are many methods to solve the dispersion of carbon fiber, but the effect is not very obvious and has great limitations

Method used

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  • Carbon fiber/silica hybrid material and preparation method thereof
  • Carbon fiber/silica hybrid material and preparation method thereof
  • Carbon fiber/silica hybrid material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A carbon fiber / silicon dioxide hybrid material, the preparation method of which is:

[0024] (1) Put 5 parts of carbon fibers into a mixed solution (mass ratio 1:1) of 50 parts of concentrated sulfuric acid (mass concentration 80%) and concentrated nitric acid (mass concentration 65%), and heat at 45°C for 45 minutes to prepare Get carboxylated carbon fiber;

[0025] (2) Add 1 part of carboxylated carbon fiber into the flask, then add 5 parts of polyacrylic acid, 5 parts of catalyst dicyclohexylcarbodiimide, and 100 mL of tetrahydrofuran, mix ultrasonically for 30 minutes, vacuumize the flask and fill it with nitrogen, under the protection of nitrogen Magnetic stirring at 50°C for 24 hours, drying the product at 60°C to obtain polyacrylic acid-grafted carbon fibers;

[0026] (3) Add 1 part of polyacrylic acid grafted carbon fiber prepared in step (2) into the flask, add 5 parts of dicyclohexylcarbodiimide, 0.5 part of 4-dimethylaminopyridine, 5 parts of silane coupling...

Embodiment 2

[0030] A carbon fiber / silicon dioxide hybrid material, the preparation method of which is:

[0031] (1) Put 7.5 parts of carbon fiber into a mixed solution (mass ratio 1:2) of 112.5 parts of concentrated sulfuric acid (mass concentration 85%) and concentrated nitric acid (mass concentration 68%), and heat at 47.5°C for 67.5min, Prepare carboxylated carbon fibers;

[0032] (2) Add 2.5 parts of carboxylated carbon fibers into the flask, then add 7.5 parts of polyacrylic acid, 7.5 parts of catalyst dicyclohexylcarbodiimide, and 125 mL of tetrahydrofuran, mix ultrasonically for 45 minutes, vacuumize the flask and fill it with nitrogen, under the protection of nitrogen Stir magnetically at 55°C for 36 hours, and dry the product at 60°C to obtain polyacrylic acid-grafted carbon fibers;

[0033] (3) Add 3 parts of polyacrylic acid grafted carbon fibers prepared in step (2) into the flask, add 7.5 parts of dicyclohexylcarbodiimide, 0.75 parts of 4-dimethylaminopyridine, and 7.5 parts...

Embodiment 3

[0037] A carbon fiber / silicon dioxide hybrid material, the preparation method of which is:

[0038] (1) Put 10 parts of carbon fiber into a mixed solution (mass ratio 1:3) of 200 parts of concentrated sulfuric acid (mass concentration 98%) and concentrated nitric acid (mass concentration 70%), and heat it at 50°C for 90 minutes to prepare Get carboxylated carbon fiber;

[0039] (2) Add 5 parts of carboxylated carbon fibers into the flask, then add 10 parts of polyacrylic acid, 10 parts of catalyst dicyclohexylcarbodiimide, and 150 mL of tetrahydrofuran, mix ultrasonically for 60 minutes, vacuumize the flask and fill it with nitrogen, under the protection of nitrogen Stir magnetically at 60°C for 48 hours, and dry the product at 60°C to obtain polyacrylic acid-grafted carbon fibers;

[0040] (3) Add 5 parts of polyacrylic acid grafted carbon fiber prepared in step (2) into the flask, add 10 parts of dicyclohexylcarbodiimide, 1 part of 4-dimethylaminopyridine, 10 parts of silan...

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Abstract

The invention discloses a carbon fiber / silica hybrid material and a preparation method thereof; the preparation method comprises: (1) preparing carboxylated carbon fiber; (2) preparing polyacrylic-grafted carbon fiber; (3) preparing siloxane-grafted carbon fiber; (4) preparing a hybrid material with spherical silica grafted to carbon fiber surface; (5) drying in vacuum freezing environment. The preparation method of the invention has high grafting rate, the produced silica is evenly and spherically attached to the surface of the carbon fiber, the specific surface area of the carbon fiber is increased greatly, and the dispersibility of the fiber in matrix material is improved.

Description

technical field [0001] The invention relates to the technical field of silica hybrid materials, in particular to a method for preparing carbon fiber / silica hybrid materials by grafting and modifying carbon fibers. Background technique [0002] Hybrid materials have the characteristics of nanomaterials, which makes hybrid materials have broad application prospects in many high-tech nanotechnology fields. In addition, because the interface between components is at the microscopic level or even at the molecular level, this characteristic can The stress concentration at the interface is reduced, and the excellent properties of the components are fully utilized, so that the mechanical properties of the hybrid material are significantly better than those of conventional materials. Due to its particularity, hybrid materials involve knowledge of various disciplines such as nanoscience, materials science, chemistry, and physics. Research has also become a very comprehensive research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79D06M11/55D06M11/64D06M15/263D06M101/40
Inventor 俞科静罗霞钱坤刘景艳张典堂卢雪峰孙洁
Owner JIANGNAN UNIV
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