Method for preparing UV light-catalyzed carbon fiber grafted polyaniline

A technology of ultraviolet light and polyaniline, applied in the direction of carbon fiber, fiber processing, textile and papermaking, etc., can solve the problems of poor substrate wettability and high inertia of carbon fiber surface, and achieve the effect of improving electromagnetic wave absorbing performance and enhancing wettability.

Inactive Publication Date: 2017-11-21
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing polyaniline grafted with short-cut carbon fiber by ultraviolet photocatalysis, which has the advan

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0020] Example 1:

[0021] A preparation method of UV-light catalyzed chopped carbon fiber grafted polyaniline, the specific preparation steps are as follows:

[0022] Put the chopped carbon fibers with a length of 5 to 20 mm into a reaction system of 0.2 mol / L ammonium persulfate / 0.005 mol / L ferrous chloride, keep at 60 ° C for 2 hours, wash and dry with distilled water, and obtain the oxidized of carbon fiber;

[0023] An appropriate amount of dopamine hydrochloride and tris(hydroxymethylaminomethane) were placed in water, so that the concentration of the prepared dopamine solution was 2 mg / mL, and the pH was adjusted to 8.5 for later use;

[0024] The oxidized carbon fibers are placed in a dopamine solution, reacted for a certain period of time at room temperature of 20-25 °C, washed with anhydrous ethanol for several times, and dried to obtain dopamine-modified chopped carbon fibers, namely: aminated carbon fibers;

[0025] Grafting polyaniline on carbon fiber surface: a...

Example Embodiment

[0028] Example 2:

[0029] A preparation method of UV-light catalyzed chopped carbon fiber grafted polyaniline, the specific preparation steps are as follows:

[0030] Put the chopped carbon fibers with a length of 5 to 20 mm into a reaction system of 0.1 mol / L ammonium persulfate / 0.001 mol / L ferrous chloride, keep it at 70 ° C for 1.5 h, wash and dry with distilled water to obtain oxidized rear carbon fiber;

[0031] An appropriate amount of dopamine hydrochloride and tris(hydroxymethylaminomethane) were placed in water, so that the concentration of the prepared dopamine solution was 3 mg / mL, and the pH was adjusted to 8.5 for later use;

[0032] The oxidized carbon fibers are placed in a dopamine solution, reacted for a certain period of time at room temperature of 20-25 °C, washed with anhydrous ethanol for several times, and dried to obtain dopamine-modified chopped carbon fibers, namely: aminated carbon fibers;

[0033] Grafting polyaniline on the surface of carbon fibe...

Example Embodiment

[0036] Example 3:

[0037] A preparation method of UV-light catalyzed chopped carbon fiber grafted polyaniline, the specific preparation steps are as follows:

[0038] Put the chopped carbon fibers with a length of 5 to 20 mm into a reaction system of 0.15 mol / L ammonium persulfate / 0.003 mol / L ferrous chloride, keep at 80 ° C for 1 h, wash and dry with distilled water, and obtain the oxidized of carbon fiber;

[0039] An appropriate amount of dopamine hydrochloride and tris(hydroxymethylaminomethane) were placed in water, so that the concentration of the prepared dopamine solution was 4 mg / mL, and the pH was adjusted to 8.5 for later use;

[0040] The oxidized carbon fibers are placed in a dopamine solution, reacted for a certain period of time at room temperature of 20-25 °C, washed with anhydrous ethanol for several times, and dried to obtain dopamine-modified chopped carbon fibers, namely: aminated carbon fibers;

[0041] Grafting polyaniline on the surface of carbon fibe...

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Abstract

The invention discloses a method for preparing UV light-catalyzed carbon fiber grafted polyaniline. The method comprises the following steps: soaking chopped carbon fibers in ammonium persulfate/ferrous chloride, stirring for certain time, washing, and vacuum-drying to obtain oxidized chopped carbon fibers; pre-modifying the oxidized chopped carbon fibers with dopamine; and placing dopamine-modified carbon fibers and ammonium persulfate in a dopamine hydrochloride solution and grafting the surfaces of the dopamine-modified carbon fibers with polyaniline under irradiation of a UV lamp. In the method, the number of surface active groups of the fibers is increased firstly through oxidation, then the surfaces are modified with dopamine, and the polyaniline is polymerized to be grafted onto the surfaces of the fibers under catalysis of ultraviolet light, so that improvements on wettability and reactivity with a matrix in the later stage are favorable, and the electromagnetic wave absorption performance is greatly improved. The method has the advantages of being mild in conditions, high in grafting efficiency, relatively stable in polyaniline on the surfaces of the fibers, and capable of improving poor bonding strength with the matrix, low adhesion and the like, and is favorable for improving the performance of a carbon fiber reinforced composite material.

Description

Technical field: [0001] The invention relates to a preparation method of modified chopped carbon fiber, in particular to a preparation method of ultraviolet photocatalyzed chopped carbon fiber grafted with polyaniline, which belongs to the technical field of modification of chopped carbon fiber. Background technique: [0002] Carbon fiber and its resin-reinforced composite materials are widely used in structural materials, high-temperature-resistant materials, wave-absorbing materials, invisible materials, etc. due to their advantages of light weight, high strength, high temperature resistance, creep resistance, and electromagnetic absorption. However, it has disadvantages such as large surface inertia, low surface energy, poor wettability with the matrix, and unsatisfactory electromagnetic properties. Among them, grafting polymers on the surface of fibers and their composite applications are important measures to improve the above shortcomings, and modification Carbon fiber...

Claims

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Application Information

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IPC IPC(8): D06M15/61D06M13/368D06M11/50D06M11/28D06M101/40
CPCD06M15/61D06M11/28D06M11/50D06M13/368D06M2101/40
Inventor 董会娜张东生孙卫康姚栋嘉吴恒刘喜宗
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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