CN103881140B - A kind of active carbon filler preparation method of high electro-magnetic wave absorption performance - Google Patents
A kind of active carbon filler preparation method of high electro-magnetic wave absorption performance Download PDFInfo
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- CN103881140B CN103881140B CN201410092405.2A CN201410092405A CN103881140B CN 103881140 B CN103881140 B CN 103881140B CN 201410092405 A CN201410092405 A CN 201410092405A CN 103881140 B CN103881140 B CN 103881140B
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- active carbon
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Abstract
The present invention relates to technical field of function materials; be specifically related to a kind of active carbon filler preparation method of high electro-magnetic wave absorption performance; inhale ripple powder as benchmark taking the active carbon of 100 parts of weight; add the finish of 5-30 weight portion that microparticle surfaces is applied; then add 60～450 weight portion adhesive specials to mediate granulation or extrusion molding, then the dry active carbon that obtains absorbing property strengthening is inhaled ripple granulated filler. Prepared high-performance electromagnetic wave absorption function filler has the advantages such as wave absorbing efficiency is high, intensity, density is adjustable, addition content is high, Technological adaptability is strong, can be used as the wave absorbing agent in foams or structure Wave suction composite material, for the radar wave camouflage of military target and the protection of civil buildings electromagnetic pollution.
Description
Technical field
The present invention relates to technical field of function materials, be specifically related to a kind of active carbon of high electro-magnetic wave absorption performanceFiller preparation method.
Background technology
Active carbon has wide material sources, cheap and easy to get, chemical stability good, pore structure is abundant, specific areaLarge feature is a kind of outstanding carbonaceous functional material. It is right that our company passes through in the application study of active carbonA series of modified measures of active carbon, are strengthened the electromagnetic performance of active carbon, can possess simultaneously lightweight,The advantage of bigger serface and high electromagnetic absorption rate, is having aspect electromagnetic radiation protection and radar wave absorption extensivelyApplication prospect. But active carbon fine powder has that intensity is low, the shortcoming of bad dispersibility, a large amount of carbon powder particlesAssemble and can form compared with the electric conductor of large scale, electromagnetic wave is formed to strong reflection, reduce absorption efficiency, simultaneously poly-The loose particles of collection due to adhesion a little less than, be easy in composite to form dry bag and intensity defect, limitedIt is as inhaling the application of wave energy filler in composite and light foam material.
Inhale wave energy filler dielectric constant, magnetic conductivity to electromagnetic assimilation effect and material and effectively showArea is relevant, and the main advantage of active carbon is surface area and the extremely low apparent density that it is huge. WeIn real application research, find, because active carbon powder surface area is large, with resin matrix mixed process in easilyIn occurring to assemble dry bag phenomenon, form the bulky grain electric conductor of short texture, make electromagnetic wave be difficult for enteringThe performance electro-magnetic wave absorption effect of intragranular portion. Simultaneously the wave-absorbing effect of composite is to fill out with the suction ripple of admixture whereinMaterial amount is directly proportional, and inhaling ripple is the fine particle below 800 orders with active carbon, and the addition content in resin exceedesAfter 8%, viscosity sharply rises, and processing performance is deteriorated serious, and impact is used. Therefore Powdered Activated Carbon is inhaled rippleThe application of filler must solve dispersiveness, ripple conduction and resistance matching problem. Solution party at present is also correlated withThe report of case.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of improvement and inhale ripple active carbon intensity and electromagnetic absorptionThe preparation method of energy, processes the clad that forms one deck wave transparent on surface by the organic matter to modified activated carbon,Then extrusion molding after mediating with the binding agent blend with high dielectric property, obtains high performance active carbon and inhalesRipple filler.
Realize technical scheme of the present invention as follows:
An active carbon filler preparation method for high electro-magnetic wave absorption performance, comprises the steps:
Taking 100 weight portions inhale ripples with active carbon powder as basic material, add the finish of 5-40 weight portion,At 40～95 DEG C of temperature, carry out mechanical agitation 30～120min, form pretreatment material; To improve soaking of active carbonLubricant nature energy.
To in pretreatment material, add the binding agent of 10～450 weight portions, at 40～95 DEG C, carry out machinery and mediate40～200min, then, by screw extruder extrusion molding, obtains preforming material;
Then preforming material is sent in dryer, at the air drying 1-6 hour of 80～120 DEG C,Be met the granular suction ripple of the active carbon filler of performance requirement.
Described suction ripple is mesopore activity carbon dust or the activated carbon powder after electromagnetism modification with active carbon powder, granularityBelow 800 orders.
Described finish includes but not limited to oleic acid, linoleic acid, OPEO, polyoxyethylene nonyl phenyl secondAlkene ether and 14 alkylolamides class non-ionic surface active agents below charcoal, finish is liquid at 40～95 DEG CBody, and there is good wetting property.
Described binding agent is dextrin, modified starch, polyvinyl alcohol, carboxymethyl cellulose, carboxymethyl celluloseA kind of or any two kinds of mixing in element sodium, Sodium Polyacrylate, lignosulfonate, propylene glycol be dissolved in fromThe aqueous solution that sub-water forms, concentration is according to deliquescent difference, between 4%～15%.
Described outlet of extruder injection pressure should be greater than 150Mpa. The configurable rotary cutting of mould outlet of extruderCutter head is to control the length of pellet.
In addition the present invention also provide a kind of evaluation method of active carbon absorbing property be by active carbon inhale ripple filler withThermosetting phenolic resin is mixed with the even compound that weight ratio is 8:92, then puts into 180mm × 180mmMould in, after paving, be heating and curing, making thickness is the uniform board-like sample of 2mm. And then placeOn the pure aluminum plate of 180mm × 180mm, carry out electro-magnetic wave absorption effect test by arc method.
The present invention improves the intensity of activated carbon powder by bonding and moulding greatly, to composites intensityImpact weakened, and the consumption that can make to inhale ripple filler can bring up to from the highest 8% the highest by 50%,Strengthen suction ripple usefulness; Be the lower electromagnetic loss binding agent of high dielectric property due to what use simultaneously, make electromagnetismRipple can go deep into filler particles inside by the adhesive of wave transparent, can give full play to each activated carbon powderAbsorbing property. By a series of technological measure, active carbon is inhaled the electro-magnetic wave absorption performance of ripple filler from originally-frequency range below 10dB is greater than 3.4GHz(obtained the maximum absorption-14dB), be increased to-below 10dBFrequency range be greater than 11.2GHz(obtained the maximum absorption-28dB). It is strong that active carbon prepared by the method is inhaled ripple fillerSpend adjustablely between 0.2～8MPa, length is adjustable between 0.5～10mm, and diameter is adjustable between 1～5mm,Greatly increase the intensity of composite, improved the processing performance of active carbon filler simultaneously.
The present invention inhales ripple powder as benchmark taking the active carbon of 100 parts of weight, adds the finish of 5-30 weight portion to makeMicroparticle surfaces applies, and then adds 60～450 weight portion binding agents to mediate granulation or extrusion molding, soThe rear dry active carbon that obtains absorbing property strengthening is inhaled ripple granulated filler. Prepared high-performance electric magnetic wave is inhaledReceive that functional stuffing has that wave absorbing efficiency is high, intensity, that density is adjustable, addition content is high, Technological adaptability is strong etc. is excellentPoint, can be used as the wave absorbing agent in foams or structure Wave suction composite material, hidden for the radar wave of military targetThe protection of body and civil buildings electromagnetic pollution.
Detailed description of the invention
Active carbon powder in embodiment all uses same raw material below, and its granularity is less than 18 μ m(800 orders),Its electro-magnetic wave absorption performance is after tested for-frequency range below 10dB is greater than 3.4GHz, obtained the maximum absorption-14.7dB。
Embodiment 1:
Inhale at 100g the oleic acid that ripple special-purpose activated charcoal powder adds 5g, at 40 DEG C of temperature, carry out mechanical agitation120min, forms pretreatment material. The polyvinyl alcohol water solution that the concentration that adds 60g in pretreatment material is 12%,At 70 DEG C, carry out machinery and mediate 120min, then by screw extruder and mould extrusion molding, systemBecome the long preforming material of 4mm. Then preforming material is sent in dryer, at the air dryings of 80 DEG C 2Hour, obtaining density is 0.68g/cm3, intensity is 4MPa activated carbon granule shape is inhaled ripple filler. Warp and ringThe composite molding test that epoxy resins is composite and absorbing property test, find, maximum filler addition content can reach45%, still can meet the viscosity requirement of matrix moulding. To the sample of same thickness, reflectance test is less thanThe frequency range of-10dB reaches 4.2GHz, and limit absorption value-21.2dB has obviously and carries compared with powdery suction ripple fillerHigh.
Embodiment 2:
Inhale at 100g the OPEO that ripple special-purpose activated charcoal powder adds 22g, at 70 DEG C of temperatureCarry out mechanical agitation 30min, form pretreatment material. The hydroxyl that the concentration that adds 450g in pretreatment material is 8%The aqueous solution of methylcellulose carries out machinery and mediates 60min at 40 DEG C, then by screw extruder andMould extrusion molding, makes the long preforming material of 2mm. Then preforming material is sent in dryer,The air dryings of 120 DEG C 4 hours, obtaining density was 0.58g/cm3, intensity 2.7MPa active carbonGranular suction ripple filler. Through composite molding test and the absorbing property test composite with epoxy resin, find, whenFiller addition content can reach 40%, still can meet the viscosity requirement of matrix moulding. To the sample of same thickness,The frequency range of be less than-10dB of reflectance test reaches 4.8GHz, and limit absorption value-19.2dB inhales compared with powderyRipple filler is significantly improved.
Embodiment 3:
Inhale at 100g the linoleic acid that ripple special-purpose activated charcoal powder adds 10g, at 40 DEG C of temperature, carry out machinery and stirMix 60min, form pretreatment material. The lignosulfonate that the concentration that adds 60g in pretreatment material is 15%The aqueous solution carries out machinery and mediates 120min at 70 DEG C, then extrudes by screw extruder and mouldMoulding, makes the long preforming material of 2.5mm. Then preforming material is sent in dryer, at the sky of 80 DEG CIn gas, be dried 6 hours, obtaining density is 0.75g/cm3, intensity 8MPa activated carbon granule shape inhale ripple filler.Through composite molding test and the absorbing property test composite with epoxy resin, find, when filler addition content canReach 48%, still can meet the viscosity requirement of matrix moulding. To the sample of same thickness, reflectance test is littleFrequency range in-10dB reaches 4.7GHz, limit absorption value-17.2dB, and inhaling ripple filler compared with powdery has obviouslyImprove.
Embodiment 4:
Inhale at 100g the nonyl alcohol acetamide that ripple special-purpose activated charcoal powder adds 18g, at 90 DEG C of temperature, carry outMechanical agitation 90min, forms pretreatment material. The dextrin water that the concentration that adds 70g in pretreatment material is 10%Solution carries out machinery and mediates 60min at 40 DEG C, is then extruded into by screw extruder and mouldType, makes the long preforming material of 2mm. Then preforming material is sent in dryer, in the air of 90 DEG CDry 5 hours, obtaining density was 0.64g/cm3, intensity 3.2MPa activated carbon granule shape inhale ripple filler.Through composite molding test and the absorbing property test composite with epoxy resin, find, when filler addition content canReach 40%, still can meet the viscosity requirement of matrix moulding. To the sample of same thickness, reflectance test is littleFrequency range in-10dB reaches 4.5GHz, limit absorption value-20.4dB, and inhaling ripple filler compared with powdery has obviouslyImprove.
Embodiment 5:
Inhale at 100g the linoleic acid that ripple special-purpose activated charcoal powder adds 12g, at 40 DEG C of temperature, carry out machinery and stirMix 120min, form pretreatment material. The carboxymethyl cellulose that the concentration that adds 220g in pretreatment material is 11%The aqueous solution of element sodium carries out machinery and mediates 40min, then by screw extruder and shaping mould at 70 DEG CTool extrusion molding, makes the long preforming material of 3mm. Then preforming material is sent in dryer, at 80 DEG CAir drying 6 hours, obtaining density is 0.47g/cm3, intensity 0.8MPa activated carbon granule shape inhaleRipple filler. Through composite molding test and the absorbing property test composite with epoxy resin, find, when filler is mixedDosage can reach 32%, still can meet the annual requirement of matrix moulding. To the sample of same thickness, reflectionThe frequency range of be less than-10dB of rate test reaches 11.2GHz, and limit absorption value-28dB inhales ripple compared with powdery and fills outMaterial is significantly improved.
Embodiment 6:
Inhale at 100g the NPE that ripple special-purpose activated charcoal powder adds 14g, at 90 DEG C of temperatureCarry out mechanical agitation 120min, form pretreatment material. The concentration that adds 320g in pretreatment material is 6%The aqueous solution of Sodium Polyacrylate carries out machinery and mediates 60min at 90 DEG C, then by screw extruder andMould extrusion molding, makes the long preforming material of 2mm. Then preforming material is sent in dryer,The air dryings of 95 DEG C 6 hours, obtaining density was 0.54g/cm3, intensity 1.8MPa active carbonGranular suction ripple filler. Through composite molding test and the absorbing property test composite with epoxy resin, find, whenFiller addition content can reach 40%, still can meet the annual requirement of matrix moulding. To the sample of same thickness,When 8% addition (the maximum addition content of powder), the frequency range of be less than-10dB of reflectance test reaches 6.4GHz,Limit absorption value-24.4dB, inhales ripple filler compared with powdery and is significantly improved.
Embodiment 7:
Inhale at 100g the oleic acid that ripple special-purpose activated charcoal powder adds 30g, at 40 DEG C of temperature, carry out mechanical agitation60min, forms pretreatment material. Polyvinyl alcohol, carboxylic first that the concentration that adds 450g in pretreatment material is 4%The base cellulose mixtures aqueous solution carries out machinery and mediates 200min at 95 DEG C, then passes through screw extruderWith mould extrusion molding, make the long preforming material of 2mm. Then preforming material is sent in dryer,The air dryings of 120 DEG C 6 hours, obtaining density was 0.52g/cm3, intensity 1.6MPa active carbonGranular suction ripple filler. Through composite molding test and the absorbing property test composite with epoxy resin, find, whenFiller addition content can reach 40%, still can meet the annual requirement of matrix moulding. To the sample of same thickness,When 8% addition (the maximum addition content of powder), the frequency range of be less than-10dB of reflectance test reaches 4.9GHz,Limit absorption value-19.3dB, inhales ripple filler compared with powdery and is significantly improved.
Claims (4)
1. an active carbon filler preparation method for high electro-magnetic wave absorption performance, is characterized in that, comprises as followsStep:
Taking 100 weight portions inhale ripples with active carbon powder as basic material, add the finish of 5-40 weight portion,At 40～95 DEG C of temperature, carry out mechanical agitation 30～120min, form pretreatment material;
To in pretreatment material, add the binding agent of 10～450 weight portions, at 40～95 DEG C, carry out machinery and mediate40～200min, then, by screw extruder extrusion molding, obtains preforming material;
Then preforming material is sent in dryer, at the air drying 1-6 hour of 80～120 DEG C,Be met the granular suction ripple of the active carbon filler of performance requirement;
Described suction ripple is mesopore activity powdered carbon or the activated carbon powder after electromagnetism modification with active carbon powder, granularityBelow 800 orders.
2. the active carbon filler preparation method of high electro-magnetic wave absorption performance according to claim 1, its spyLevy and be, described finish comprises oleic acid, linoleic acid, OPEO, NPEAlkylolamides class non-ionic surface active agent with 14 below carbon, finish is liquid at 40～95 DEG C,And there is wetting property.
3. the active carbon filler preparation method of high electro-magnetic wave absorption performance according to claim 1, its spyLevy and be, described binding agent is dextrin, modified starch, polyvinyl alcohol, carboxymethyl cellulose, carboxymethylA kind of or any two kinds of mixing in sodium cellulosate, Sodium Polyacrylate, lignosulfonate, propylene glycol are dissolved inThe aqueous solution that deionized water forms, concentration is according to deliquescent difference, between 4%～15%.
4. the active carbon filler preparation method of high electro-magnetic wave absorption performance according to claim 1, its spyLevy and be, described outlet of extruder injection pressure should be greater than 150Mpa.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1522972A (en) * | 2003-09-03 | 2004-08-25 | 华南理工大学 | Method for preparing magnetic filling with biological affinity, hydrophilicity and activity for water treatment |
| CN1657441A (en) * | 2004-01-12 | 2005-08-24 | 富康技术股份有限公司 | Polypropylene filter material, its preparation method and a biofilm filtering device |
| CN101628758A (en) * | 2009-08-04 | 2010-01-20 | 中国人民解放军后勤工程学院 | Modified PVC biologic filler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1522972A (en) * | 2003-09-03 | 2004-08-25 | 华南理工大学 | Method for preparing magnetic filling with biological affinity, hydrophilicity and activity for water treatment |
| CN1657441A (en) * | 2004-01-12 | 2005-08-24 | 富康技术股份有限公司 | Polypropylene filter material, its preparation method and a biofilm filtering device |
| CN101628758A (en) * | 2009-08-04 | 2010-01-20 | 中国人民解放军后勤工程学院 | Modified PVC biologic filler |
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