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Interface modified carbon fiber/polypropylene composite material and preparation method thereof

A composite material and carbon fiber technology, which is applied in fiber processing, textiles and papermaking, etc., can solve the problems that are not suitable for improving the interface bonding between non-polar polypropylene and carbon fiber, difficult chemical bonding, and affecting the stress of composite fiber and matrix Issues such as transfer and dispersal

Active Publication Date: 2014-06-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of carbon fiber is inert, the surface energy is low, and there are few functional groups with chemical activity, and polypropylene is a non-polar polymer, which leads to poor wettability between carbon fiber and polypropylene resin, and it is also difficult to form chemical bonds between the two. Therefore, the composite material interface is easy to form defects, and the interface bonding strength is low, which directly affects the stress transfer and dispersion between the composite material fiber and the matrix, so the high performance of carbon fiber cannot be fully exerted.
[0004] In order to improve the interfacial properties of carbon fiber-reinforced resin-based composites, surface modification of carbon fibers is required, and traditional methods such as oxidation treatment, high-energy rays, laser, coupling agent treatment, and plasma treatment can increase the surface polar groups of carbon fibers. Quantity, which helps to improve the interfacial bonding strength between carbon fiber and polar resin matrix, but the above method is not suitable for improving the interfacial bonding between non-polar polypropylene and carbon fiber

Method used

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  • Interface modified carbon fiber/polypropylene composite material and preparation method thereof

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[0115] Fabrication of interfacially reinforced composites

[0116] The above-mentioned method is used to prepare interface-reinforced and modified carbon fibers, and then the carbon fibers are fixed on the substrate and shaped through a composite material forming process to obtain the composite material.

[0117] The forming process of the interface reinforced composite material of the present invention is not limited, and the available forming processes include (but not limited to): resin film infiltration forming process, autoclave forming process and compression molding process. Preferably, the forming process of the present invention is a compression molding process.

[0118] In a preferred example of the present invention, the steps of the composite material forming process are as follows:

[0119] A method for preparing a composite material modified by interface reinforcement, comprising:

[0120] preparing surface-modified carbon fibers by the method of the invention,...

Embodiment 1

[0132] Step (1) Oxidation treatment of carbon fiber precursor (unsizing): put 10 parts by weight of carbon fiber into 100 parts by weight of 60% nitric acid, then reflux at a temperature of 60°C for 2 hours, then filter and wash with deionized water until The washing solution is neutral, and the surface oxidized carbon fibers are obtained by drying at a temperature of 80°C;

[0133] Step (2) prepares the carbon fiber that the surface is connected with hexachlorocyclotriphosphazene: acid-binding agent and carbon oxide fiber are put into anhydrous tetrahydrofuran according to the weight ratio of 40:100, then the hexachlorocyclotriphosphazene of 15 parts by weight is dissolved Slowly add the above reaction solution into the solvent, react at 30°C for 12 hours, take out the carbon fiber and wash it with solvent for several times, and dry it in a vacuum oven at 60°C for later use.

[0134] Step (3) Grafting polyphosphazene on the surface of carbon fibers: putting 100 parts by weigh...

Embodiment 2

[0139] Step (1) Oxidation treatment of carbon fiber precursor (unsizing): put 10 parts by weight of carbon fiber into 100 parts by weight of 60% nitric acid, then reflux at a temperature of 60°C for 2 hours, then filter and wash with deionized water until The washing solution is neutral, and the surface oxidized carbon fibers are obtained by drying at a temperature of 80°C;

[0140] Step (2) prepares the carbon fiber that the surface is connected with hexachlorocyclotriphosphazene: acid-binding agent and carbon oxide fiber are put into anhydrous tetrahydrofuran according to the weight ratio of 40:100, then the hexachlorocyclotriphosphazene of 15 parts by weight is dissolved Slowly add the above reaction solution into the solvent, react at 30°C for 12 hours, take out the carbon fiber and wash it with solvent for several times, and dry it in a vacuum oven at 60°C for later use.

[0141] Step (3) Grafting polyphosphazene on the surface of carbon fiber: put 100 parts by weight of ...

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Abstract

The invention discloses an interface enhanced modification method of a carbon fiber composite material. Specifically, the method comprises the steps of grafting polyphosphazene on the surface of carbon fiber to obtain modified carbon fiber with a large number of amino groups on the surface, and further performing chemical grafting reaction on graphene and aminated carbon fiber. By grafting a series of graphene with different densities on the surface of the carbon fiber, the roughness and specific surface area of the surface of the carbon fiber can be effectively increased, the interface mechanical engagement effect between the carbon fiber and a resin matrix is enhanced, and active groups on the surface of the graphene can further form chemical bonds with the resin matrix, so that the interface bonding strength of the carbon fiber and resin matrix composite material is significantly improved. The invention further provides the carbon fiber prepared on the basis of the method, the composite material prepared by using the carbon fiber, and a product prepared by using the composite material.

Description

technical field [0001] The invention belongs to the field of interface modification of composite materials, and more specifically relates to a method for preparing an interface-reinforced carbon fiber / polypropylene composite material. Background technique [0002] At present, the commonly used carbon fiber reinforced resin-based composite materials are still mainly thermosetting resins, especially sheet molding compounds are widely used in the manufacture of auto parts. However, with the decrease of fossil energy and the increasing awareness of human environmental protection, energy conservation and emission reduction has become the goal of the common efforts of the whole world. In the past two decades, due to the rapid development of the automobile industry and the rapid expansion of the application of composite materials in the field of automotive materials, the problem of volatilization of harmful gases and waste recycling of thermosetting composite materials has become p...

Claims

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Application Information

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IPC IPC(8): D06M15/673D06M11/74D06M11/64D06M11/56C08K9/04C08K9/02C08K7/06C08J5/06C08L23/12C08L51/06
Inventor 张笑晴徐海兵刘东颜春范欣愉
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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