Preparation method of ZIF-67 nondestructive modified carbon fiber reinforced composite material

Abstract

The invention discloses a preparation method of a ZIF-67 nondestructive modified carbon fiber reinforced composite material, which comprises the following steps: removing pollutants on the carbon fiber surface, and immersing in nitric acid; dissolving cobalt nitrate hexahydrate into an alcoholic solution a to form a solution A, dissolving functionalized carbon fibers and 2-methylimidazole into analcoholic solution b to form a solution B, and adding the solution A into the solution B for hydrothermal reaction to obtain ZIF-67 modified carbon fibers; mixing the ZIF-67 modified carbon fibers, aramid fibers and paper fibers, and preparing a composite material prefabricated body by adopting a suction filtration molding process; and then dipping in a modified phenolic resin ethanol solution, and carrying out hot-pressing curing to obtain the ZIF-67 nondestructive modified carbon fiber reinforced composite material. ZIF-67 is grafted to carbon fibers under the hydrothermal condition, so thatthe inert smooth environment of the surfaces of the carbon fibers is improved, and the mechanical property of the composite material is improved. The method is simple in process and low in material preparation cost.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of ZIF-67 nondestructively modified carbon fiber reinforced composite material. Background technique [0002] Carbon fiber not only has the inherent intrinsic characteristics of carbon materials, but also has the softness and processability of textile fibers, and has high specific strength, high specific modulus, high temperature resistance, chemical corrosion resistance, radiation resistance, fatigue resistance, creep resistance, etc. The series has excellent performance, so it can be used as a very important structural component. However, the surface of carbon fiber has a turbostratic graphite structure, and its surface contains almost no active functional groups, showing chemical inertness and liquid repellency. The poor bonding performance between carbon fiber and resin matrix becomes its bottleneck. The use of strong o...

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Problems solved by technology

However, the surface of carbon fiber has a turbostratic graphite structure, and its surface contains almost no active functional groups, showing chemical inertness and liquid repellency. The poor bonding performance between carbon fiber and resin matrix becomes its bottleneck.

The use of strong oxidation or high-energy radiation will damage the inherent strength of carbon fibers, and the grafting of hydrophobic nanomaterials will result in poor wettability between the fibers and the matrix. Chinese patent (application number CN201810429653.X) discloses "electrochemical polymerization modification The method of surface treatment of carbon fiber and carbon fiber composite material", using carbon fiber as anode and graphite plate as cathode, the surface of carbon fiber is treated under the action of electric current to change the surface state of carbon fiber, but this method will damage the inherent strength of carbon fiber; Chinese patent (The application number is CN201811544172.X) discloses "an isocyanate surface modified carbon fiber-polypropylene composite material and its preparation method", using polyurethane or epoxy resin sized chopped carbon fiber, and grafting on the carbon fiber by surface grafting The introduction of long-chain alkyl groups on the surface improves the interfacial binding force between the carbon fiber surface and the polypropylene matrix, but grafting macromolecular substances on the carbon fiber surface will have a large steric hindrance effect, which is not conducive to the subsequent resin impregnation process

Chinese patent (Application No. CN201210544213.1) discloses "a method for surface treatment of carbon fibers". The high-energy plasma emitted at low temperature hits the surface of carbon fibers, causing a series of physical and chemical changes on the surface of carbon fibers and obtaining a large amount of activated activated carbon. atoms to improve the bonding strength between carbon fiber and resin matrix, but this method requires high experimental techniques

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