Puas yog Agglomeration qhov nyuaj tshaj plaws ntawm Carbon Nanotube Powder?

Ib qho ntawm cov txheej txheem loj tshaj plaws ntawm cov pa roj carbon nanotube hmoov hauv cov ntaub ntawv siv tau yog qhov tseeb agglomeration, thiab cov hmoov qhuav zoo tib yam stirring feem ntau tsuas tuaj yeem txhim kho macroscopic mixing. Nws yog ib qho nyuaj heev kom dissociate ruaj khov CNT bundles los ntawm qis - siv qhuav blending ib leeg.

Cov pa roj carbon nanotubes muaj qhov sib piv siab, cov cheeb tsam loj loj, thiab muaj zog sib cuam tshuam - raj, ua rau lawv yooj yim rau kev tsim cov pob khoom -zoo li lossis cov qauv agglomerated thaum npaj, khaws cia, thiab kev thauj mus los. Kev tshawb fawb qhia tau hais tias van der Waals kev sib cuam tshuam ntawm CNTs txhawb kev tsim cov pob khoom thiab cov sib sau ua ke, uas tseem yog qhov ntev - sawv kev sib tw dispersion raws li cov pa roj carbon nanotubes txav los ntawm cov khoom siv kuaj mus rau cov ntawv thov kev lag luam. Tab sis muaj ib qho teeb meem ntawm no uas yooj yim overlooked: "Stirring the black powder evenly" ≠ "Tseem dispersing cov carbon nanotubes." Rau cov factories, qhov tiag tiag yuav tsum tau txiav txim siab yog:

Cov hmoov nplej qhuav puas tuaj yeem tawg CNT agglomerates mus rau lub hom phiaj loj?

CNTs puas tuaj yeem nkag mus rau hauv matrix?

Lawv puas yuav rov ua dua -agglomerate thaum lub sijhawm ua haujlwm tom ntej?

Puas yuav CNT ntev yuav luv luv thaum tawg?

Cov lus nug no txiav txim siab seb cov pa roj carbon nanotube hmoov puas tuaj yeem ua tiav nws cov khoom siv hluav taws xob, kev txhawb zog, lossis electromagnetic shielding zog.

I. Vim li cas Carbon Nanotube Powder tshwj xeeb rau agglomeration?

Qhov laj thawj tseem ceeb vim li cas cov pa roj carbon nanotubes tuaj yeem ua rau agglomeration yog qhov sib xyaw ua ke ntawm thaj chaw siab tshwj xeeb thiab muaj zog sib cuam tshuam - raj, uas ua rau tus kheej CNTs tsis kam nyob sib cais ntawm ib leeg mus ntev.

Cov pa roj carbon nanotubes tsis yog ib qho zoo tib yam spherical hais.

Lawv muaj cov yam ntxwv tshwj xeeb heev:

Nanoscale txoj kab uas hla;

Micron- nplai lossis ntev dua;

High nam piv;

Graphitized nto;

Qhov chaw sib cuag loj heev.

Thaum coob tus CNTs tuaj rau hauv kev sib cuag, bundle -zoo li cov qauv yooj yim tsim ntawm cov hlab. CNTs tsim cov pob khoom crystalline vim muaj zog van der Waals attraction, thiab qhov no tus kheej - kev coj tus cwj pwm sib sau ua ke yog ib qho teeb meem tseem ceeb cuam tshuam rau kev ua CNT thiab kev siv tau zoo. Qhov chaw tshwj xeeb ntawm qhov chaw siab, qhov chaw hydrophobic, van der Waals rog, thiab π-π kev sib cuam tshuam ntawm CNTs ua rau lawv tsim cov khoom sib sau lossis cov pob khoom sib txawv ntawm ntau qhov sib txawv hauv ntau cov polymers thiab cov kuab tshuaj sib txawv. Yog li ntawd, cov tsos ntawm agglomeration nyob rau hauv carbon nanotube hmoov tsis tas txhais hais tias cov khoom tsis zoo.

Ib qho℃ntawm agglomeration yog nws tus kheej ib qho ntawm cov khoom yam ntxwv ntawm CNT hmoov.

Dab tsi tiag tiag yuav tsum tau tswj hwm yog: Cov agglomerate loj npaum li cas, lawv nruj npaum li cas, thiab seb lawv puas tuaj yeem ua tau zoo de-agglomerated tom qab nkag mus rau qhov kawg system.

II. Dab tsi yog qhov "Agglomeration" hauv Carbon Nanotube Powder?

Agglomeration hauv CNT hmoov tsis yog tsuas yog ob peb qhov sib txuas ua ke, tab sis tej zaum yuav yog cov qauv tsim los ntawm cov kauj ruam los ntawm ib tus neeg cov raj, pob khoom -zoo li cov qauv, thiab cov khoom loj thib ob.

Nws tuaj yeem nkag siab yooj yim li peb theem:

Qib thib ib: CNT tus kheej

Qhov no yog qhov zoo tagnrho ib leeg -tube xeev.

Qib thib ob: CNT pob

Ntau cov pa roj carbon nanotubes ua ke nrog ib leeg hauv ib qho kev taw qhia, ua ib pob.

Qib thib peb: Macroscopic Agglomerate

Cov lej loj ntawm CNT cov pob khoom txuas ntxiv txuas ntxiv thiab sib txuas, tsim pom lossis micron - nplai hmoov agglomerates.

Kev tshawb fawb tau pom tias CNTs nyob rau hauv qhov tsis ruaj tsis khov dispersion systems yuav xub tsim kwv yees li cov khoom sib txuas uas muaj txog 2-6 lub raj, tom qab ntawd ntxiv cov qauv peb-dimensional network agglomerate.

Yog li ntawd: Ib tug me me dub particle pom los ntawm lub Hoobkas yuav tsis yog ib tug "particle" nyob rau hauv, tab sis ib tug loj loj ntawm intertwined carbon nanotubes.

III. Ordinary qhuav hmoov Stirring ncaj qha tawg ua pa roj carbon Nanotubes?

Nws tuaj yeem txhim kho macroscopic uniformity, tab sis feem ntau tsis tuaj yeem cuam tshuam tag nrho cov CNT ruaj khov rau hauv cov raj zoo tib yam lossis cov pob khoom zoo -zoo li cov qauv.

Qhov no yog tus yuam sij rau kev nkag siab "carbon nanotube qhuav hmoov dispersion."

Ordinary qhuav blending khoom mas muab:

stirring;

Convection;

Kev sib txhuam;

Compression;

Ib qho℃ntawm shear.

Nws tuaj yeem tig CNT hmoov los ntawm: Loj agglomerates → Cov hmoov sib xyaw zoo sib xws. Tab sis nws yuav tsis tas yuav ua tiav ntxiv: Cov agglomerates loj → me me agglomerates → CNT bundles → Ib leeg raj - theem dispersion.

Cov kev tshawb fawb uas twb muaj lawm tau muab piv rau CNT qhuav- xeev mechanical de-agglomeration nrog ntub ua, taw qhia tias kev sib xyaw tshuab siv tau siv zog xws li shear, compression, thiab kev sib txhuam kom tawg agglomerates, tab sis rau nruj agglomerated MWCNTs, de-kev sib xyaw ua ke feem ntau muaj peev xwm.

Yog li, yog ib lub Hoobkas hais tias: "Peb stirred CNTs thiab resin hmoov ua ke rau 30 feeb, thiab nws zoo nkaus li zoo li qub."

Qhov kev txiav txim siab no tsuas yog qhia tau tias: kev sib xyaw macroscopic yog qhov sib xws. Nws tseem tsis tuaj yeem ua pov thawj: CNTs tau tawg tag nrho ntawm qhov ntsuas me me.

IV. Vim li cas thiaj tuaj yeem qhuav hmoov Stirring Saib Uniform tab sis CNT Agglomerates Tseem Muaj?

Vim tias macroscopic uniformity thiab nanoscale uniformity yog ob lub ntsiab lus sib txawv.

Piv txwv li, 1 kg ntawm carbon nanotubes yog ntxiv rau 100 kg batch ntawm resin.

Tom qab qhuav hmoov sib tov, nws yuav zoo nkaus li zoo ib yam los ntawm lub thawv ntim, xim, thiab qhov muag pom.

Tab sis tom qab magnification, cov hauv qab no tseem yuav muaj nyob:

10 μm-qib agglomerates;

Ob peb -μm- theem CNT pob khoom;

Hauv cheeb tsam siab - cheeb tsam tseem ceeb;

CNT networks tsis tau nthuav dav.

Qhov no tuaj yeem nkag siab nrog lub tswvyim hauv qab no:

Lub hom phiaj tiag tiag tsis yog tias txhua daim ntawv thov yuav tsum ua tiav "ua tiav kev tawg ntawm tus kheej CNTs." Lub hom phiaj tsim nyog tiag tiag yog kom ua tiav qhov kev faib tawm uas sib npaug ntawm cov khoom kawg.

V. Vim li cas Carbon Nanotube Qhuav Powder Dispersion nyuaj dua li Ordinary Hmoov?

Qhov sib piv siab thiab siab tshwj xeeb ntawm thaj chaw ntawm CNTs muab rau lawv muaj zog entanglement thiab agglomeration tendencies piv rau cov zoo tib yam spherical fillers.

Kev sib piv tuaj yeem ua tau:

Yog li ntawd, nws tsis tuaj yeem xav tias: "Nano hmoov tuaj yeem daws tau los ntawm kev ua kom nrawm nrawm." CNT dispersion yog ib qho teeb meem ua ke txiav txim siab los ntawm lub zog tawm tswv yim, kev sib cuam tshuam ntawm lub ntsej muag, thiab cov qauv khoom siv.

VI. Yuav txiav txim li cas seb Carbon Nanotube Powder Puas Muaj Tseeb?

Koj tsis tuaj yeem tsuas saib xim thiab pom kev pom. Qhov tsawg kawg nkaus, kev txiav txim siab yuav tsum muab cov agglomerate loj, microscopic morphology, viscosity, los yog kev ua haujlwm kawg.

Nws raug nquahu kom xaiv txoj kev sim raws li daim ntawv thov.

Ntawm cov no, qhov kev sim ua tiav zaum kawg feem ntau muaj txiaj ntsig ntau dua li kev nrhiav ib tus lej me me ib leeg.

Vim tias txawm tias CNT qhov system zoo li tawg mus rau hauv lub tshuab tsom iav, yog tias qhov kawg conductivity tsis txhim kho, nws tsis tuaj yeem suav tias yog kev ua tiav tiav.

VII. Dab tsi Dispersion txheej txheem yuav tsum tau siv rau Carbon Nanotube Powder?

Ib txoj hauv kev txhim khu kev qha yog siv cov txheej txheem ntsuas ntawm "pre- sib xyaw-de-agglomeration-stabilization- pov thawj," es tsis yog siv lub zog siab tshaj plaws los ntawm qhov pib.

Kauj Ruam 1: Ua ntej- sib tov

Ua ntej tso cai rau CNTs los tsim kev sib cuag nrog cov khoom tseem ceeb lossis qhov nruab nrab dispersion.

Kauj Ruam 2: Maj mam nce shear

Maj mam nce txhua yam zog raws li qib ntawm agglomeration.

Kauj ruam 3: Siv Ultrasound los yog sib tsoo thaum tsim nyog

Rau cov kua-theem systems, agglomerate loj tuaj yeem txo qis ntxiv los ntawm ultrasound, siab shear, lossis sib tsoo.

Kauj ruam 4: Stabilization

Siv cov dispersants lossis cov kev hloov kho saum npoo uas haum rau lub kaw lus kom txo tau qhov tshwm sim ntawm re-agglomeration.

Kauj Ruam 5: Kev Tshawb Fawb

Yam tsawg kawg nkaus, kuaj:

Agglomerate loj;

viscosity;

Sedimentation;

CNT ntev;

Qhov kawg conductive kev ua tau zoo.

Txoj hauv kev no yog ua raws li "sib xyaw-ultrasound-stabilization-kev ua pov thawj" txoj hauv kev tshawb nrhiav CNT dispersion. Cov kev tshuaj xyuas cuam tshuam kuj tseem kho cov khoom sib xyaw, ultrasound, thiab stabilization raws li cov kauj ruam tseem ceeb hauv CNT kua-phase/composite dispersion tsim.

VIII. Puas yog qhov Dispersion nyuaj tib yam rau txawv Carbon Nanotube Hmoov?

No. Tube txoj kab uas hla, qhov ntev, purity, deg lub xeev, thiab agglomeration℃tag nrho cuam tshuam rau cov txheej txheem dispersion zaum kawg.

Yog li ntawd, ib tus tsis tuaj yeem luam tawm ncaj qha rau lwm tus: "500 W + 30 feeb," thiab tom qab ntawd xav tias lawv tus kheej CNTs yuav tsum ua tiav cov txiaj ntsig zoo ib yam.

CNT dispersion parameters yuav tsum tau txiav txim nyob rau hauv ua ke nrog nrog: cov khoom specifications + khoom cov ntsiab lus + nruab nrab + Dispersant + khoom.

IX. Raws li ib tug Carbon Nanotube Powder Chaw tsim tshuaj paus, Shandong Tanfeng Li cas pab cov neeg muas zaub daws teeb meem agglomeration?

CNT tus neeg muag khoom muaj txiaj ntsig tiag tiag yuav tsum tsis yog tsuas yog muab cov lus qhia cov hmoov nplej, tab sis kuj tseem yuav pab cov neeg siv khoom sib cuam tshuam cov khoom tsis sib xws nrog cov txheej txheem cuam tshuam tiag tiag.

Raws li cov pa roj carbon nanotube hmoov chaw tsim tshuaj paus, Shandong Tanfeng tuaj yeem sib phim nyob ib puag ncig tus neeg siv khoom daim ntawv thov zaum kawg:

CNT hom;

Txoj kab uas hla;

Ntev;

Purity;

Qhov chaw tshwj xeeb;

Nto lub xeev;

Daim ntawv thov system;

Pom zoo dispersion kev taw qhia.

Piv txwv li, yog tias tus neeg siv khoom lag luam nrog:

Conductive Plastics:Qhov tseem ceeb ntawm lub raj txoj kab uas hla + ntev + nam piv + extrusion shear tej yam kev mob

Aqueous Slurry:Qhov tseem ceeb ntawm kev ntub dej + dispersant + shear / ultrasound + stability

NMP System:Lub ntsiab tseem ceeb ntawm cov kuab tshuaj compatibility + dispersion xeev + khoom cov ntsiab lus + viscosity

Roj Hmab Compounding:Lub ntsiab tseem ceeb ntawm nam piv + interfacial bonding + txheej txheem sib tov

Yog li ntawd, Shandong Tanfeng cov khoom xaiv logic tuaj yeem hloov mus ntxiv los ntawm: "Yuav ua li cas tus qauv muag," mus rau: "Dab tsi dispersion teeb meem tus neeg yuav tsum tau daws."

X. Puas yog Agglomeration hauv Carbon Nanotube Powder yog ib qho kev kos npe tsis zoo?

Nws tsis tuaj yeem txiav txim siab yooj yim li no, vim tias qee qhov kev sib sau ua ke hauv cov hmoov qhuav qhuav yog ib qho kev coj cwj pwm ntawm cov khoom nws tus kheej.

Dab tsi tiag tiag yuav tsum paub qhov txawv yog:

Ib txwm hmoov agglomerationtuaj yeem rov-pab tawm los ntawm cov txheej txheem tsim nyog.

Tshaj -compacted agglomerationxav tau lub zog ntau dua los qhib.

agglomeration tshwm sim los ntawm cov khoom nto lub xeevtej zaum yuav xav tau kev hloov cov txheej txheem dispersion.

Irreversible agglomeration tshwm sim los ntawm cov txheej txheem khotej zaum twb tau cuam tshuam cov khoom ua tau zoo kawg.

Yog li ntawd, thaum lub sij hawm yuav khoom, tsis txhob cia li xav tau: "Cov hmoov yuav tsum tsis muaj agglomeration kiag li."

Ib qho kev xav tau ntau tshaj yog: "Raws li kuv lub hom phiaj thiab cov txheej txheem txheej txheem, cov hmoov nplej tuaj yeem ua tiav li cas?"

XI. FAQ

Puas yog agglomeration qhov nyuaj tshaj plaws ntawm carbon nanotube hmoov?

Agglomeration yog ib qho ntawm cov txheej txheem tseem ceeb hauv CNT cov ntawv thov kev lag luam, tab sis nws tsis yog qhov nyuaj xwb. Ntxiv nrog rau agglomeration, wetting, dispersion stability, nam ratio preservation, viscosity, interfacial bonding, thiab batch stability kuj yuav tsum tau xav txog.

Puas tuaj yeem qhuav hmoov nplawm ncaj qha rau cov pa roj carbon nanotubes?

Nws tuaj yeem txhim kho kev sib xyaw macroscopic, tab sis cov hmoov qhuav zoo tib yam stirring feem ntau tsis tuaj yeem lav tag nrho kev sib cais ntawm nruj nreem khi CNT bundles. Yog tias cov khoom kawg muaj cov kev xav tau siab rau microscopic dispersion, ntxiv siab shear, yaj compounding, los yog ntub dispersion feem ntau xav tau.

Vim li cas cov pa roj carbon nanotubes nquag tsim agglomerates?

Feem ntau muaj feem cuam tshuam nrog kev sib txuam muaj zog - raj van der Waals kev sib cuam tshuam, thaj chaw siab tshwj xeeb, thiab ib qho - qhov loj me ntawm qhov sib piv.

Ultrasound puas tuaj yeem daws CNT agglomeration?

Nws tsis tuaj yeem lav tau. Ultrasound tuaj yeem txhim kho cov kua-theem dispersion, tab sis cov nyhuv yog nyob ntawm CNT specifications, nruab nrab, dispersant, concentration, thiab lub zog tawm tswv yim, thiab ultrasound ntau dhau yuav ua rau CNT qhov ntev.

Puas yog qhov ua kom zoo dua ntawm cov pa roj carbon nanotubes ib txwm zoo dua?

Tsis yog. Ib qho nyiaj tshuav yuav tsum tau pom ntawm cov agglomerate txo, dispersion stability, conductive network, thiab CNT ntev preservation.

Dab tsi yog CNT qhuav blending haum rau?

Kev sib xyaw qhuav yog qhov tsim nyog rau cov hmoov ua ntej- sib tov, polymer qhuav compounding, masterbatch, thiab qee txoj kev ua hmoov. Yog tias cov khoom kawg yog aqueous los yog NMP slurry, kua - cov txheej txheem dispersion feem ntau tseem xav tau.

Yuav txiav txim seb CNT hmoov puas yooj yim tawg?

Koj tsis tuaj yeem saib qhov purity xwb. Nws raug nquahu kom sib piv cov raj txoj kab uas hla, qhov ntev, thaj chaw tshwj xeeb, hmoov agglomeration xeev, thiab xav kom cov neeg muag khoom muab TEM / SEM thiab cov ntaub ntawv xeem dispersion rau lub hom phiaj.

Shandong Tanfeng puas tuaj yeem muab cov lus pom zoo cuam tshuam?

Yog lawm. Cov khoom sib txuam thiab cov txheej txheem dispersion cov lus pom zoo tuaj yeem muab raws li lub raj txoj kab uas hla, qhov ntev, purity ntawm CNT hmoov, thiab cov neeg siv khoom aqueous, NMP, resin, lossis lwm yam kev siv tshuab.

Cov pa roj carbon Nanotubes tsis yog "Nyob rau qhov sib npaug" -Thiab, Dab tsi Tseeb Dispersion txhais tau tias yuav tsum tau nkag siab kom raug

Agglomeration ntawm carbon nanotube hmoov yog ib qho kev sib tw ua tiav los ntawm nws cov nanostructure, thiab cov hmoov qhuav zoo tib yam nplawm tsuas yog daws cov macroscopic uniformity, uas tsis tuaj yeem sib npaug rau nanoscale de{0}}agglomeration.

Rau qee cov khoom siv hluav taws xob, cov khoom siv hmoov sib xyaw, thiab cov txheej txheem masterbatch: Kev sib xyaw qhuav → High shear / extrusion → Kev ua tiav kawg tuaj yeem dhau los ua qhov tsim nyog.

Rau aqueous, NMP, thiab lwm lub tshuab ua kua: Ua ntej- ntub dej → Siab shear → Ultrasound / sib tsoo → Stabilization → Kev pov thawj ua haujlwm feem ntau yog tsim nyog.

Thiab cov txheej txheem CNT dispersion zoo tiag tiag tsis yog: "Tso CNTs zoo li ua tau." Tab sis theej: "Siv lub zog txaus los qhib qhov tsis xav tau agglomerates thaum khaws cia ntev thiab cov qauv ntawm CNTs ntau li ntau tau."

Qhov no kuj yog qhov tseem ceeb tshaj plaws thaum yuav cov pa roj carbon nanotube hmoov- cov khoom tsis muaj kev txiav txim siab pib, thiab cov txheej txheem dispersion txiav txim siab seb cov khoom puas tuaj yeem tso tawm tiag tiag.

Raws li cov pa roj carbon nanotube hmoov chaw tsim tshuaj paus, Shandong Tanfeng, ntxiv rau muab cov pa roj carbon nanotube hmoov ntawm cov khoom sib txawv, kuj tseem tuaj yeem phim cov ntaub ntawv los ntawm qhov ntev xws li raj txoj kab uas hla, qhov ntev, purity, qhov chaw tshwj xeeb, thiab lub hom phiaj dispersion raws li tus neeg siv khoom daim ntawv thov zaum kawg. Rau cov neeg muas zaub xav tau aqueous, NMP, resin compounding, los yog conductive plastics daim ntaub ntawv, es tsis tsuas yog muab piv "lub tuam txhab cov hmoov twg yog pheej yig dua," nws yog pom zoo kom ncaj qha piv rau lub xeev agglomeration, ntxiv nyiaj, conductive kev kawm, thiab batch stability nyob rau hauv tib txoj kev dispersion.

Tus nqi tseeb ntawm carbon nanotube hmoov tsis yog nyob rau hauv qhov sib txawv ntawm cov hmoov nws tus kheej zoo li cas, tab sis seb nws puas tuaj yeem tsim ib qho kev ua haujlwm zoo nrog cov qauv tsim nyog tom qab nkag mus rau cov khoom kawg.