Flame-retardant modified carbon fiber prepreg and composite material product

A technology of carbon fiber prepreg and flame-retardant materials, which is applied in the field of structural composite materials, can solve the problems of changing the molding process, difficult process, poor processability, etc., and achieve the effects of improving toughness, inhibiting air diffusion, and inhibiting combustion

Active Publication Date: 2015-04-29
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the flame retardant modification of carbon fiber composite materials, one is to use a flame retardant matrix resin, but some resin systems such as polyimide have better high temperature resistance and flame retardancy, but are extremely expensive and have poor processability One is to modify existing flammable resins such as epoxy resins by using additive flame retardants. Therefore, most of the existing aviation epoxy resin-based composite materials have not been flame-retardant modified. Adding micro-nano materials to improve the flame-retardant performance of the material will also lead to the viscosity increase of the resin system, and the process is very difficult; there is another method It is to add flame retardants between layers, but it may cause a decrease in the mechanical properties of the composite material, and it is actually difficult for a thin layer of flame retardants or a small amount of flame retardants to be effectively flame retardant.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The implementation process of the technical solution of the present invention is as follows:

[0035] (1-1) Disperse 3 g of silica nanoparticles or nano-layered silicate clay or halloysite nanotubes in N,N-dimethylformamide or N,N-dimethylacetamide, three The diameters or layer thicknesses are 50nm, 70nm and 35nm respectively, and then take 75g of phenolphthalein-modified polyaryletherketone (PEK-C) or polyethersulfone (PES-C) and 25g of polyphenylphosphonic acid diphenyl sulfone Dissolve the ester evenly in the dispersion liquid, and ultrasonically disperse to obtain a uniform dispersion liquid; cast the solution into a film, control the final film thickness at 18 μm or 32 μm by the amount of the solution, blow and dry at 80°C for 1 hour, and then Vacuum dry at 100°C for 10 hours or 15 hours, remove the film to obtain a flame-retardant modified film, and use thick needles with a diameter of 0.5 mm to pierce a needle hole every 5 mm on the film;

[0036] (1-2) Get the ...

Embodiment 2

[0042] The implementation process of the technical solution of the present invention is as follows:

[0043] (2-1) Dissolve 17g of phenolphthalein-modified polyarylether ketone or phenolphthalein-modified polyarylether sulfone or polyethylene terephthalate into 83g of N,N-dimethylformamide, with a mass percent concentration of 17 %, then add 0.35g multi-walled carbon nanotubes with a diameter of 25nm and 0.5g carbon-60, add 0.1g polyvinylpyrrolidone to improve the dispersion of carbon nanomaterials, after adding, ultrasonically mix evenly, and set aside. Use the spacer to control the thickness of the coated solution liquid film to 100 μm or 150 μm, then dry it in an oven, remove the film and punch holes mechanically to obtain a flame-retardant modified toughened film with a thickness ranging from 15 μm to 20 μm or 24 to 30 μm .

[0044] (2-2) Lay the flame-retardant modified films obtained above on benzoxazine (BOZ) resin pre-impregnated carbon fiber cloth one by one. The fa...

Embodiment 3

[0046] The implementation process of the technical solution of the present invention is as follows:

[0047] (3-1) Heat and dissolve 18g of polyetherimide or 17g of polyphenylene sulfide in DMF to form a solution with a concentration of 18% or 17% by mass, and add 7g or 4g of polymer flame retardant or 5.5g of Small molecule flame retardant, the polymer flame retardant is polyphenyl sulfone diphenyl phosphonate or nitrogen-containing heterocyclic triphenylphosphine oxide polyarylether or tribromophenol modified novolac resin, small molecule flame retardant The fuel is octabromoether or decabromodiphenyl ether or N,N-bis(5,5-dimethyl-4-substituted phenyl-2-oxo-1,3,2-dioxaphosphorinyl )-4,4'-p-diphenylmethane or N,N-bis(5,5-dimethyl-4-substituted phenyl-2-oxo-1,3,2-dioxaphosphorinyl )-4,4'-p-Diphenylsulfone, dissolve and stir evenly, cast to form a film, control the solution amount to control the thickness of the final dried film to be 20 μm or 28 μm, dry to obtain a flame-reta...

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Abstract

The invention relates to flame-retardant modified carbon fiber prepreg and a composite material product with high flame retardance. A flame-retardant film with an interlayer combustion barrier action can be formed after being applied to a carbon fiber reinforced lamination resin based composite material, and the film has a certain thickness, consists of a thermoplastic toughening agent capable of being thermally dissolved into resin and a flame retardant and / or nano particles which are uniformly dispersed into the film, and is used for preparing the flame-retardant modified carbon fiber resin prepreg together with conventional carbon fiber resin prepreg. After the prepreg is prepared into the composite material, a continuous combustion barrier layer is formed among layers and is dispersed into a layer with a high carbon fiber content to take a collaborative barrier effect, thereby achieving a good flame retardance effect. UL94 perpendicular combustion method shows that the flame-retardant level can reach V0 above without overflowing smog in combustion, while an unmodified composite material has no flame-retardant level and generates a great amount of smog, and moreover, the iris layer has a dual-continuous complex-phase structure, and the toughness of the composite material can be improved.

Description

technical field [0001] The invention belongs to the technical field of structural composite materials, and relates to a flame-retardant modified carbon fiber prepreg and a high flame-retardant composite material product. Background technique [0002] Fire is one of the main safety hazards of commercial and military aircraft. The high heat, smoke and toxic substances produced by fire seriously threaten the lives of passengers. Among all aircraft accidents, fire ranks fourth among the causes (Boeing 2005, Statistical summary of commercial jet airplane accidents-worldwide operations 1959-2004, Seattle, Washington, US, P.18.), and fire fatalities are increasing at a rate of 4% per year [FAA website]. [0003] Carbon fiber-reinforced resin-based laminated composite materials are mainly used to manufacture the shell and skin of aerospace vehicles. Since entering the 21st century, represented by the US B787 and the European A380 large aircraft, continuous carbon fiber-reinforced po...

Claims

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Application Information

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IPC IPC(8): B32B27/04B32B27/06B32B27/18
CPCB32B9/007B32B27/06B32B27/18B32B2260/046
Inventor 郭妙才益小苏
Owner AVIC COMPOSITES
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