Kev Tshawb Fawb Kev Tshaj Tawm ntawm Graphene / Epoxy Resin Composite Coatings (1)

Vim lawv txoj kev sib txawv hauv molecular, epoxy resins (EP) tuaj yeem muaj cov khoom sib txawv. Thiab vim nws yog ib qho yooj yim uas yuav tsum tau sib xyaw nrog cov curing sib txawv, cov tshuaj lom neeg, cov koom haum, thiab lwm yam., Npaj cov tshuaj epoxy resin nrog cov khoom siv zoo, mechanical, thermal, adhesion, rwb thaiv tsev thiab cov khoom tawm los tiv thaiv, thiab yog dav siv los tiv thaiv corrosion coatings. . Txawm li cas los xij, nrog cov nyom ntawm daim ntawv thov, EP coatings yooj yim qhia tau qee yam tsis raug: Ua ntej, vim tias cov thermal conductivity, ua rau tsis kub tsis muaj zog, feem ntau EP tsuas yog tsim rau cheeb tsam sab nraum qab 100 ° C; Thib ob, vim qhov kev sib dhos ntawm qhov kev sib txuas siab tom qab kho, Vim li ntawd, kev sib txhuam coefficient siab heev, thiab kev coj hnyav thiab kev ua haujlwm tsis zoo yog cov neeg pluag. Thib peb, qhov kev tiv thaiv siab yog qhov siab thiab cov nyhuv tshuab electrostatic yog yooj yim generated. Qhov thib plaub yog tias tom qab kho, cov teeb meem tau yooj yim thiab cov kev txhuam tus corrosion yog cuam tshuam. Yuav kom zoo dua siv cov txiaj ntsig ntawm EP, cov neeg nqa khoom raug ntxiv los txhim kho kev ua haujlwm.

Graphene muaj peev xwm zoo tshaj plaws hauv kev txhim kho cov khoom ntawm cov khoom siv pob zeb raws li nws cov khoom siv lead ua cim thiab zoo heev lub cev thiab nws cov kev ua haujlwm yuav pib ua kom cov tshuaj polymerization. Txij li ntawm graphene muaj ib qhov chaw loj thiab ib qhov chaw siab zog, nws yog yooj yim agglomerated thaum ntxiv los ua ib qho muab tub lim rau ib qho tshuaj replica, uas cuam tshuam qhov kev kawm ntawm cov txheej. Thiaj li ua kom sib npaug zog hauv cov thawv rau epoxy, cov kws tshawb fawb tau tshawb nrhiav ntau heev. Los ntawm qhov pib yooj yim tov, ultrasonic dispersion technology tau tsim, thiab ib tug neeg siv tshuaj tua kab silane tau siv los txhim kho cov kev nplua thiab kev sib tw ntawm graphene thiab epoxy resin. Nws tau pom tias qhov sib ntxiv ntawm graphene kho tau qhov kev ua tau zoo ntawm cov txheej, tab sis thaum tau ntxiv rau ib qho nqi, qhov txuam nrog graphene yuav cuam tshuam ntxiv kev txhim kho ntawm kev ua kom txheej txheem. Nyob rau hauv xyoo tas los no, qee cov kws tshawb fawb tau npaj cov graphene functionalized los ntawm cov kev hloov kho hauv cov pab pawg hauv graphene. Nws tau pom tias thaum nws tuav cov qauv graphene-raws li, nws tuaj yeem txhim kho qhov kab rau cov epoxy matrix, ua graphene / epoxy. Kev tshawb fawb ntawm cov ntaub ntawv pov thawj cov ntaub ntawv tau ua tshiab.

1. Kev Tshawb Pom Kev Txhim Kho ntawm Graphene / Epoxy Resin Coatings

Los ntawm qhov kev ntsuas ntawm thermal pom, graphene yog cov khoom siv nrog cov thermal conductivity tam sim no paub (ib zaug xwb yog txog 5000W / mK), raws li ib tug muab tub lim tau tuaj yeem ua rau cov hluav taws kub tuaj ntawm epoxy; los ntawm cov neeg kho tshuab thiab khoom sib txuas, Graphene muaj li ntawm sp2 hybrid cov qauv nruab nrab ntawm carbon. Nws muaj modulus siab, siab zog, thiab qis qis zog thiab tsawg txhuam coefficient ntawm graphene txheej. Nws yog ib qho yooj yim uas tau hloov mus rau epoxy txheej zais rau tsim ib zaj yeeb yaj kiab. Tom qab ua ke nrog epoxy, txoj hlua ua haujlwm thiab tej yam ua haujlwm ntawm lub txheej yuav ua kom zoo dua tuaj; los ntawm qhov pom ntawm cov hluav taws xob cov khoom, qhov theoretical resistivity ntawm graphene monolayer yog li 10-6 Ω · m, thiab vim nws tsawg ntom ntom, cov epoxy yog thaum muaj tsawg tus nqi graphene ntxiv rau cov duab, nws muaj zoo kev muaj peev xwm; los ntawm qhov pom ntawm kev tiv thaiv corrosion, vim muaj qhov nyhuv me me ntawm graphene thiab cov ntawv ob sab, cov defects nyob rau hauv cov epoxy txheej yuav zoo tuaj kom nws tau coated. Ib txheej thaiv txheej thaiv kab zauv yog tsim los ntawm cov txheej kom txhob txhuam.

1.1 Cov Khoom Thermal

Huang Kun li al. siv graphene ua tus zauv ntxiv rau epoxy, phom sij hloov phom sij thiab cov yeeb nkab xim hauv peb lub tshuab. Cov kev ntsuas kub tsis haum thiab hluav taws xob los ntawm lub cev muaj peev xwm raug kuaj los ntawm cov kev kuaj xyuas hluav taws xob thiab hluav taws xob. Kev sib deev. Cov kev tshwm sim qhia tau tias piv tsis muaj graphene, qhov kub ntawm 3 lub cev tsis zoo, thiab tom qab 500 x ntawm hluav taws xob, epoxy zoo xws li tom qab txoj kev kho, ua kev sib tshuam mus txuas ntxiv tom qab kho dua ntais, graphene kuj thim ntau Compact, zoo dua kub ua hauj. Yang et al. kawm tau cov graphene ntawv (G) / multi-walled carbon nanotubes (MWCNTs) / epoxy resin (EP) composites thiab pom tias muaj ib qho kev txuam ntawm G thiab MWCNTs. Vim yog qhov kev siv bridging no, lawv muaj feem xyuam nrog tus EP. Qhov chaw tiv thaiv tau loj dua kom tsis txhob muab cov agglomeration ntawm lub cev. Lub thermal conductivity ntawm lub composite raug ntsuas los ua 0.321 W / mK, uas yog 146.9% siab tshaj qhov ntawm cov ntshiab EP (0.13 W / mK).

1.2 Coj kev ua haujlwm thiab kev ua haujlwm

Wu Fang siv graphene (G) thiab graphene oxide (GO) los txhim kho cov qauv ntawm cov xim silicon carbide thiab epoxy resin. Tawm, kev sib txhuam coefficient ntawm G / EP composite txheej hauv qhuav txhuam thiab seawater txhuam yog ntsuas. Cov xab npum EP raug tshem tawm los ntawm 14.5% thiab 33.7%, hnav nqi qis dua 69.1% thiab 32,1%; GO / EP compact coating txo kev txhuam coefficient los ntawm 15.6% thiab 35.5% piv nrog ntshiab EP txheej, thiab hnav nqi qis dua 79%. Thiab 67.9%. Ren Xiaomeng thiab lwm tus tau npaj cov G, GO / EP, thiab tshawb xyuas lawv qhov teeb meem thiab kev txhawb nqa ntawm EP. Cov kev tshwm sim qhia tau tias thaum cov feem feem coob ntawm G thiab GO yog 2%, qhov tawg ntawm qhov sib xyaw nce siab txog 102% thiab 48.5%, feem ntau; Thaum cov feem loj ntawm G thiab GO yog 1%, lub zog ntawm qhov sib sau ua ke nce 18% thiab 2%, feem.

1.3 Cov khoom hluav taws xob

Wang Guojian li al. siv tus kheej ua graphene thiab coj mus muag cov roj carbon nanotubes, fullerenes, thiab graphite li nano-conductive khoom ntxiv EP los npaj cov composites thiab kawm lawv cov khoom hluav taws xob. Cov kev tshawb fawb tau pom tias G yog ib tus neeg ua haujlwm tshawb fawb uas yog superior carbon nanotubes, fullerenes, thiab graphite. Thaum lub ntim ntawm G yog 0.25%, cov kev sib txuas ntawm cov khoom siv puas muaj qhov hloov ntawm qhov kev hloov ntawm kev hloov, qhia tias G tau raug tsim hauv EP thaum lub sijhawm no. Cov kev sib tham network; Thaum cov ntim feem ntau ntau tshaj 0.5%, qhov hluav taws xob hluav taws xob ua rau stabilize rau 2.02 x 10-7 S / m. Serena li al. piv rau cov khoom siv hluav taws xob ntawm ob los ntawm kev siv cov khoom siv ua diamond thiab graphene / epoxy composites. Cov kev tshwm sim qhia tau hais tias qhov chaw pib ntawm graphene yog ntau tsawg tshaj li ntawm cov khoom cua pob zeb. Thaum qhov sib ntxiv ntawm graphene yog 0.5% (ntim feem), lub cev tiv thaiv ntawm qhov sib txov txo los ntawm 7.14 × 10 7 Ω los 1.02 × 10 3 Ω · m, uas yog vim muaj graphite. Alkene yog ib qho hluav taws xob hluav taws xob zoo heev.

1.4 Los tiv thaiv kev kub ntxhov

Zhou Nan thiab lwm tus siv tshuaj gallic acid (GA) thiab epichlorohydrin (ECP) ua raw khoom coj los ua cov tshuaj gallic acid raws li epoxy re (GEP) raws li graphene dispersant los npaj GEP-G / EP. Txhim kho txheej txheem. Qhov kev ua kom tsis muaj zog yog tau siv los ntawm kev siv dej lub cev, Tafel polarization nkhaus thiab tsis tuaj yeem kuaj cov ntsev. Cov kev tshawb fawb qhia tias piv rau cov ntshiab EP txheej, lub polarization tiv thaiv thiab tus kheej corrosion tam sim no ceev ntawm cov txheej ntxiv ntawm qhov kev txiav txim siab ntawm qhov ntau, thiab cov dej nqes dej tau tsawg dua 0.22%, thiab cov tshuaj tua ntsev kuj zoo. Wang Yuqiong thiab lwm tus siv cov tshuaj sodium polyacrylate ua dispersant, dispersed nyob rau hauv ib lub centrifuge high-speed rau 2 teev, thiab tom qab ntawd ultrasonically dispersed rau 30 feeb kom tau txais aqueous graphene dispersion, thiab G / dejborne epoxy resin nrog G ntsiab lus ntawm 0.5% (feem feem coob) npaj. E44 txheej txheej. Cov kev tshawb fawb pom tau tias qhov sib ntxiv ntawm graphene pab kho cov dej txeem dej ntawm cov dej los ntawm epoxy, thiab Fick diffusion coefficient ntawm cov ntshiab E44 txheej yog txo los ntawm 2 xaj ntawm qhov siab; tus kheej-corrosion tam sim no ceev ntawm ntshiab E44 txheej yog 0.13μA / cm2, thiab G / tus kheej corrosion ceev ceev ntawm lub E44 composite lo tsuas yog 0.038 μA / cm2.