A method of grafting branched molecular tannic acid on the surface of carbon fiber

A technology of molecular tannic acid and surface grafting, which is applied in carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of low carbon fiber interface strength, carbon fiber body damage, low grafting rate, etc., and achieve wettability improvement and increase Roughness, the effect of improving the overall performance

Active Publication Date: 2020-04-24
QINGDAO UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low grafting rate, serious damage to the carbon fiber body and low interfacial strength of the modified carbon fiber in the existing carbon fiber surface modification method, and to provide a method for grafting branched molecular units on the carbon fiber surface. nicotine method

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  • A method of grafting branched molecular tannic acid on the surface of carbon fiber
  • A method of grafting branched molecular tannic acid on the surface of carbon fiber
  • A method of grafting branched molecular tannic acid on the surface of carbon fiber

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specific Embodiment approach 1

[0041] Embodiment 1: This embodiment is a method for grafting branched molecular tannic acid on the surface of carbon fibers, specifically as follows:

[0042] 1. Extraction treatment of carbon fiber:

[0043] ① Put the carbon fiber into a Soxhlet extractor filled with acetone, and then heat the acetone to 75°C-85°C, the acetone is continuously distilled and condensed in the Soxhlet extractor, so that the impurities on the surface of the carbon fiber are in the distilled acetone It is continuously cleaned, and the cleaning time is 48h to 72h, and the carbon fiber with the epoxy coating removed on the surface is obtained;

[0044] ②. Dry the carbon fiber from which the epoxy coating has been removed on the surface at a temperature of 70°C to 80°C for 2h to 4h to obtain the carbon fiber after extraction treatment;

[0045] 2. Oxidation:

[0046]①. Immerse the extracted carbon fiber in the potassium persulfate / silver nitrate mixed aqueous solution, heat to 60°C-80°C, and then k...

specific Embodiment approach 2

[0070] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 2 ①, the carbon fiber after the extraction treatment is immersed in the potassium persulfate / silver nitrate mixed aqueous solution, heated to 60°C-70°C, and then Keep the temperature at 60°C-70°C for 1h-1.5h to obtain oxidized carbon fibers; the concentration of potassium persulfate in the potassium persulfate / silver nitrate mixed aqueous solution is 0.1mol / L-0.15mol / L; The concentration of silver nitrate in the potassium persulfate / silver nitrate mixed aqueous solution is 0.0001mol / L˜0.01mol / L. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0071] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two (1), the carbon fiber after the extraction treatment is immersed in the potassium persulfate / silver nitrate mixed aqueous solution, and heated to 70° C. to 80° C. ℃, and then keep the temperature at 70℃~80℃ for 1.5h~2h to obtain the oxidized carbon fiber; the concentration of potassium persulfate in the potassium persulfate / silver nitrate mixed aqueous solution is 0.15mol / L~0.2 mol / L; the concentration of silver nitrate in the potassium persulfate / silver nitrate mixed aqueous solution is 0.001mol / L~0.05mol / L. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for grafting branched molecule tannic acid on the surface of carbon fiber, and relates to a method for grafting molecule tannic acid on the surface, aiming at solvingthe problems that the existing carbon fiber surface modification method is low in grafting rate, serious in the damage of a carbon fiber body, and low in interfacial intensity of the modified carbon fiber. The method comprises the following steps: I. extracting carbon fiber; II. oxidizing; III. carrying out acyl chlorinating; and IV. grafting tannic acid on the surface, to obtain carbon fiber withsurface grafted with branched molecule tannic acid. Compared with non-grafted carbon fiber, the carbon fiber with surface grafted with branched molecule tannic acid has the advantages that the interfacial shear intensity is improved to 87.3MPa-93.2MPa from 49.5MPa. The invention can obtain a carbon fiber with surface grafted with branched molecule tannic acid.

Description

technical field [0001] The invention relates to a method for grafting molecular tannic acid on the surface. Background technique [0002] Carbon fiber composite materials are widely used in the fields of aerospace, military and high-end civilian products due to their light weight, high specific strength, and high specific rigidity. The performance of carbon fiber composites is not only affected by the performance of carbon fiber and matrix, but also determined by the interface structure between the two. However, due to the smooth graphite structure of the carbon fiber surface, the interfacial bonding performance between it and the epoxy resin matrix is ​​weak, and the external load is difficult to be uniformly transmitted and dispersed between the carbon fiber and the resin matrix, which affects the carbon fiber reinforced composite material. Interface performance and overall performance. [0003] In order to overcome the problem of weak interfacial bonding between carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/238D06M11/50D06M11/65D06M13/265D06M13/402C08K9/04C08K7/06D06M101/40
CPCC08K7/06C08K9/04D06M11/50D06M11/65D06M13/238D06M13/265D06M13/402D06M2101/40
Inventor 宋国君马丽春唐丽娟李景林赵天楚
Owner QINGDAO UNIV
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