CN204551115U - Based on the multicomponent electromagnetic shielding material of carbon fiber - Google Patents
Based on the multicomponent electromagnetic shielding material of carbon fiber Download PDFInfo
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- CN204551115U CN204551115U CN201520130098.2U CN201520130098U CN204551115U CN 204551115 U CN204551115 U CN 204551115U CN 201520130098 U CN201520130098 U CN 201520130098U CN 204551115 U CN204551115 U CN 204551115U
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Abstract
Based on the multicomponent electromagnetic shielding material of carbon fiber, relate to electromagnetic shielding material production technical field.At carbon fibre fabric body peripheral hardware polymeric conductive biopolymer layer, in conduction high polymer layer outer cladding conductive black coating.The utility model material integrates the high-mechanical property of carbon fibre fabric and the waterproof wearability of coating, achieve the high effectiveness of 0.02 ~ 2.0GHz, electromagnetic shielding effect is remarkable, shield effectiveness is high, can be used for the lining material of electromagnetic shielding protective clothing and the fabric of light structure building materials and outdoor tent.
Description
Technical field
The utility model relates to electromagnetic shielding material production technical field.
Background technology
At present the protection of the electromagnetic shielding of human body is mainly adopted to the mode of directly dressing, the maximum Electromagnetically shielding fabrics of current employing be adopt metal fibre manufacture or and the form of non-metallic fibers blending obtain, also there is the electromagnetic shielding material that some use carbon fiber, and carbon fiber enbrittles due to itself, the electromagnetic shielding material of carbon fiber is therefore mostly adopted to be mixed into net with bulk fibre or directly mix high polymer to be mixed.As a kind of composite in patent document CN103450665A, nylon, alloy powder, LDPE – g – MAH and antioxidant are mixed by proportioning, on the twin screw extruder after melt blending, directly melt is clamp-oned impregnation mold.Through surface-treated fibre bundle under tension, enter in impregnation mold die cavity and fully flooded by melt.Fibre bundle after dipping is pulled out in mould, and carries out pelletizing after cooling, obtains the elongate in shape pellet that length is 10 ± 0.2mm.The composite obtained has the specific function to high and low frequency electromagnetic wave shielding, also possesses superior mechanical property specific to long fiber reinforced plastics simultaneously.As barrier material, can use and there is wave absorbtion or the single or multiple lift sheet material high to reflection of electromagnetic wave rate, a kind of electromagnetic shielding fabric for carbon fiber in patent document CN102465459A, barrier fabric is become by regenerated celulose fibre or polyacrylonitrile yarn weaving, pre-oxidation is carried out to 280 DEG C with the electrothermal furnace heating rate of 10 DEG C minutes, be incubated 2 hours, under inert gas shielding continuation electrothermal furnace with the heating rate of 15 DEG C/min to 1000 DEG C, be incubated 3 hours, obtain the carbon fiber yarn gauze of phosphorus content 90%, continue to be heated to 2000 ~ 3000 DEG C, obtain the graphite fibre yarn net of phosphorus content more than 99%, with this net for base cloth, dry method jet spinning is utilized to make various nonwoven fabric or body of wall shielding material.The method can be good at the harm shielding the many human bodies of electromagnetic wave, and spinning process is simple, and production efficiency is high, has good economic and social benefit.A kind of electromagnetic screen textile by making textiles produce shield effectiveness at the fiber surface covering metal conductive layer of non-metallic fibers textiles in patent document CN1587494, be at substrate fiber metal-coated copper, nickel on the surface, form copper, nickel composite metal conducting film.Namely first adopt electroless copper, then electronickelling on substrate fiber surfaces such as nylon, terylene, acrylic fibers, form copper nickel composite metal conducting film at substrate surface, prepare electromagnetic screen textile.The Electromagnetically shielding fabrics of the porose flexibility of patent document CN201890978U, the flexible electromagnetic shielding fabric doped with the surface coverage metal of carbon fiber is distributed with hole, and cavity is of a size of 1/5 ~ 1/10 of the electromagnetic wavelength of required protection.Distance between the central point of hole is 5mm ~ 50mm, and the shape of hole is squarish or sub-circular, and hole is of a size of 0.2 ~ 2mm, and hole takes mock leno weave to weave, and shield effectiveness remains on about 70dB.
Paster method on composite sheet is adopted to prepare electromagnetic shielding or inhale wave plate material, the laminar way utilizing material different also reaches specific wave-absorbing effect, if patent document CN 101444979A is a kind of frequency selection surface wave-absorbing material and preparation method thereof, utilize Multilayer Absorbing Material Coating complex technique, namely adopt at middle lay " ten " the font aluminium foil of layer glass fiber to realize the preparation of wide-band and wave-absorbing coating, the effective suction wave number in 2 ~ 8GHz reaches 16dB.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of electromagnetic shielding material of carbon fibre fabric, is improved to make electromagnetic suction ripple shield effectiveness.
Multicomponent electromagnetic shielding material based on carbon fiber of the present utility model, comprises carbon fibre fabric body, at carbon fibre fabric body peripheral hardware polymeric conductive biopolymer layer, in conduction high polymer layer outer cladding conductive black coating.
The utility model material integrates the high-mechanical property of carbon fibre fabric and the waterproof wearability of coating, achieve the high effectiveness of 0.02 ~ 2.0GHz, electromagnetic shielding effect is remarkable, shield effectiveness is high, can be used for the lining material of electromagnetic shielding protective clothing and the fabric of light structure building materials and outdoor tent.
The utility model is processed and is improved on the basis of carbon fibre fabric, remains the outstanding mechanical performance of carbon fibre fabric, and improve the easy brittle failure performance of carbon fiber, crucially electromagnet shield effect is superior.
The utility model conductive black coating layer thickness is 1 ~ 3mm.This coating layer thickness of the utility model can guarantee completely that carbon fiber is in the coating coated while the grammes per square metre increasing carbon fibre fabric not too much.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model product.
Fig. 2 is the electromagnetic shielding effectiveness of the utility model product and the graph of a relation of wave frequency.
Detailed description of the invention
One, further describe the utility model with example, but do not limit content of the present utility model.
In embodiment, raw materials used polyacrylonitrile (PAN) base carbon fibre endless tow (200tex/3000F), conductive black powder, pyrrole monomer, ferric trichloride, neopelex, acetone, nitric acid and polyurethane resin are commercially available prod.
1, finish and the impurity of fabric face is removed:
Sample prepares: the carbon fibre fabric of purchase is cut into 1000mm × 1000mm size, first applies the carbon fibre fabric on clipping path with resin in cutting process, to ensure that the carbon fiber samples obtained after cutting is not decoherenced.At 60 DEG C, dry 1h, after resin dries, obtain sample.
Sample is immersed in acetone, static 1d, repeatedly rinse with clear water after taking-up, dry.The sample crossed through acetone treatment is put into the nitric acid of 70% concentration, condensing reflux, control temperature, at 80 DEG C, reacts 5h.First rinse with large water gaging after taking out sample, finally use 3% sodium hydroxide solution to rinse sample, until the solution PH after rinsing detects in neutral, by samples dried.
2, at specimen surface polymeric conductive high polymer:
Get that to adopt the carbon cloth of upper step process process to put into concentration be take out nature after the neopelex solution of 0.02mol/L floods 1h to dry; Again the sample processed is put into the FeCl that concentration is 0.13mol/L
3taking out after flooding 1h in the aqueous solution, be impregnated in by the sample processed in the pyrrole monomer solution of 0.5mol/L again, is react 12h under the condition of 0 DEG C ~ 5 DEG C in the temperature of reaction system.After question response terminates, first with absolute ethyl alcohol, rinsing is carried out to sample, more repeatedly clean with clear water, until clean the solution clarification obtained, then sample to be put in vacuum drying chamber dry 4h under temperature is the cryogenic conditions of 60 DEG C, after cooling, take out sample.
By the sample obtained again from being placed in neopelex solution impregnation, through drying, being placed in FeCl again
3flood in the aqueous solution, in temperature be 0 DEG C ~ 5 DEG C pyrrole monomer solution reactions, cleaning, dry cycle process 4 ~ 6 times.
The final sample obtaining the enough conduction high polymers of polymerization, uses for lower step.
3, coated with conductive carbon black coating:
Coating prepares: by soluble in water for conductive black powder, add silane resin acceptor kh-550 and aqueous adhesive force diphenylguanidine N-630 again, with ultrasonic oscillator ultrasonic process 30min, conductive black powder is dispersed in water, and fully mixes with auxiliary agent silane resin acceptor kh-550 and aqueous adhesive force diphenylguanidine N-630.Add the aqueous polyurethane of certain mass afterwards again, use electric blender to stir 30min, form coating.
Above silane resin acceptor kh-550, aqueous adhesive force diphenylguanidine N-630 are auxiliary agent, can increase the cohesive force between coating and carbon fibre fabric.Aqueous polyurethane is used for coated with conductive hydrocarbon black powder.
Coating: use wool brush coating to be coated in equably the positive and negative two sides of the dried carbon fabric after the pre-treatment of acetone nitric acid and conduction high polymer surface oxidation polymerization process, obtain electromagnetic wave screen fabric.
Two, product structure feature:
The product made is placed in magnifying glass, the structure shown in Fig. 1 can be observed.
Carbon fibre fabric body is weaved by warp-wise carbon fiber 1 and broadwise carbon fiber 2 and is formed, and having conduction high polymer layer 3 at warp-wise carbon fiber 1 and the outer in-situ polymerization respectively of broadwise carbon fiber 2, is the conductive black coating 4 of 1 ~ 3mm at conduction high polymer layer 3 outer cladding thickness.
Three, compliance test result:
The sample bench of testboard is made up of electromagnetic wave transparent material glass, the center of signal emitters, sample and Signal reception pole three is positioned on same straight line from top to bottom, and make the spacing between signal emitters and sample, spacing between sample and Signal reception pole is 15mm.After starting measurement, the electro-magnetic wave contacts that signal emitters is launched is after specimen surface, and a part is reflected and absorbs, and another part is through sample, and the electromagnetic intensity through sample parts receives through Signal reception pole, then reads via spectrum analyzer.
Take the mode of frequency sweep, measurement category is 0.05 ~ 2.0GHz, and sweep spacing bandwidth is 0.05GHz.Regulation according to National Electrical industry military standard " measuring method of SJ20524-1995 Materials ' Shielding Effectiveness " is tested, and computational methods are as follows:
If adopt power unit to adopt dBm, then formula (2-1) can be write as
In formula, SE is the electromagnet shield effect of material, dBM; P
1for not placing sample Time-frequency Spectrum Analysis instrument reading in sample bench, dBm; P
2for placing sample Time-frequency Spectrum Analysis instrument reading in sample bench, dBm.
Obtain electromagnetic shielding effectiveness figure, as shown in Figure 2, for electromagnetic shielding effectiveness (EMSE, the electro-magnetic shielding efficiency) curve map of the multicomponent electromagnetic shielding material based on carbon fiber, in whole test frequency range, there is good shield effectiveness.
Claims (2)
1. based on the multicomponent electromagnetic shielding material of carbon fiber, comprise carbon fibre fabric body, it is characterized in that at carbon fibre fabric body peripheral hardware polymeric conductive biopolymer layer, in conduction high polymer layer outer cladding conductive black coating.
2., according to claim 1 based on the multicomponent electromagnetic shielding material of carbon fiber, it is characterized in that described conductive black coating layer thickness is 1 ~ 3mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104711857A (en) * | 2015-03-06 | 2015-06-17 | 扬州市职业大学 | Multi-component electromagnetic shielding material based on carbon fiber and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104711857A (en) * | 2015-03-06 | 2015-06-17 | 扬州市职业大学 | Multi-component electromagnetic shielding material based on carbon fiber and preparation method thereof |
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