Method for modifying carbon fiber surface by assembly of aromatic fused ring molecules and preparation method of carbon fiber interface reinforced resin matrix composite

A technology of carbon fiber and modified carbon, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., and can solve problems such as limiting the high performance of carbon fiber, high chemical inertness, and debonding of composite materials

Active Publication Date: 2019-02-15
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The surface of carbon fiber is a graphite-like structure composed of flake graphite microcrystals stacked along the fiber axis. The surface roughness is low, the chemical inertia is large, and the adhesion to the resin matrix is ​​poor, which limits the high performance of carbon fiber.
Although the current commercial sizing agent coated on the surface of carbon fiber plays the role of clustering and lubricant and improves the wettability with the resin matrix, the limited chemical bond between the sizing agent layer and the surface of carbon fiber is easy to cause damage to the composite material. Cracks are prone to interfacial debonding along the fiber axis, so the increase in interfacial shear strength is limited

Method used

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  • Method for modifying carbon fiber surface by assembly of aromatic fused ring molecules and preparation method of carbon fiber interface reinforced resin matrix composite
  • Method for modifying carbon fiber surface by assembly of aromatic fused ring molecules and preparation method of carbon fiber interface reinforced resin matrix composite
  • Method for modifying carbon fiber surface by assembly of aromatic fused ring molecules and preparation method of carbon fiber interface reinforced resin matrix composite

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preparation example Construction

[0030] The present invention also provides a method for preparing a carbon fiber interface-reinforced resin-based composite material, comprising: after obtaining surface-mounted modified carbon fibers using the method described in the above technical solution, compounding and curing the surface-mounted modified carbon fibers with a resin, Aromatic condensed ring molecular assembly modified carbon fiber interface reinforced resin matrix composites were obtained. The present invention has no special requirements on the type of resin, preferably epoxy resin, more preferably one or more of glycidyl ether type epoxy resin, glycidyl amine type epoxy resin and glycidyl ester type epoxy resin kind.

[0031]The present invention has no special requirements on the embodiment of the composite in the composite curing, and the composite method well known to those skilled in the art can be used. The present invention has no special requirements on the curing conditions, and the curing cond...

Embodiment 1

[0034] (1) Under the catalysis of triethylamine, pyromellitic dianhydride and biphenylenediamine were reacted at 90°C for 24 hours in N,N-dimethylformamide / ether mixed solvent to obtain aromatic thickened Cyclic imide molecular assembly liquid, wherein the molar ratio of pyromellitic dianhydride to biphenyl diamine is 1:1.1, the catalyst is 0.1wt.% of pyromellitic dianhydride, and the aromatic condensed cyclic imide in the assembly liquid The mass fraction of amine molecules in the solvent is 1%;

[0035] (2) Immerse unsized M55J carbon fibers in the assembly solution for 10 minutes, and obtain carbon fibers with a nanofibrous assembly layer on the surface after drying, wherein the surface assembly layer is 2.5 wt% of the carbon fiber mass.

[0036] (3) Preparation of interface-reinforced composite material: Glycidyl ester-type epoxy resin was added dropwise onto the M40J carbon fiber containing the surface assembly layer, and cured at 150°C for 5 hours to obtain an interface-...

Embodiment 2

[0038] (1) Under the catalysis of hydroxybenzoic acid, react 3,4,9,10-perylenetetracarboxylic dianhydride and octanediamine at 120°C for 18h in methanol / acetonitrile to obtain aromatic fused ring imide Molecular assembly solution, wherein the molar ratio of 3,4,9,10-perylenetetracarboxylic dianhydride to octyldiamine is 1:1.5, the mass fraction of aromatic fused ring imide molecules in the solvent in the assembly solution is 2%, and the catalyst The mass of is 0.15% of the mass of 3,4,9,10-perylenetetracarboxylic dianhydride;

[0039] (2) Immerse the unsized T800 carbon fiber in the assembly solution for 5 minutes, and obtain the carbon fiber with the nanosphere / sheet assembly layer on the surface after vacuum drying, wherein the surface assembly layer is 1.8wt% of the mass of the carbon fiber;

[0040] (3) Preparation of interface-reinforced composite material: Glycidyl ether resin was added dropwise on the surface of T800 carbon fiber with surface assembly layer, and cured a...

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Abstract

The invention provides a method for modifying a carbon fiber surface by assembly of aromatic fused ring molecules and belongs to the technical field of carbon fiber modification. The method comprisesthe following steps: aromatic fused ring dianhydride and diamine are subjected to imidization, and an aromatic fused ring imide molecule assembly liquid is obtained; carbon fibers are soaked in the aromatic fused ring imide molecule assembly liquid, the aromatic fused ring imide molecules are combined with the carbon fibers, and the carbon fibers with surfaces subjected to assembly modification are obtained. Chemical activity of the surfaces of the carbon fibers can be improved with the modification method. The invention further provides a preparation method of a carbon fiber interface reinforced resin matrix composite. The obtained carbon fibers with the surfaces subjected to assembly modification are compositely cured with resin, and the aromatic fused ring molecule assembly-modified carbon fiber interface reinforced resin matrix composite is obtained. The interface reinforced resin matrix composite obtained with the preparation method has good interfacial adhesion strength and interfacial shear strength.

Description

technical field [0001] The invention relates to the technical field of carbon fiber modification, in particular to a method for assembling and modifying the surface of carbon fiber with aromatic condensed ring molecules and a method for preparing a carbon fiber interface reinforced resin-based composite material. Background technique [0002] Carbon fiber reinforced resin matrix composites are widely used in fighter jets, large aircraft, aerospace vehicles, satellites, etc. field. In order to meet the overall performance requirements of composite materials in the structural design of aerospace materials, carrying out basic research on the high performance of carbon fiber resin matrix composite materials is a hot spot and difficult point in international research at present, and it is also a major national strategic demand, which has important theoretical research value. and engineering application prospects. [0003] The surface of carbon fiber is a graphite-like structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/59C08G73/10C08J5/06C08L63/00C08K9/04C08K7/06D06M101/40
CPCC08G73/1007C08G73/1067C08G73/1082C08J5/06C08J2363/00C08K7/06C08K9/08C08K2201/011D06M15/59D06M2101/40
Inventor 李刚许鹏林家伟向钟元王植于运花杨小平
Owner BEIJING UNIV OF CHEM TECH
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