Personal Electronic Devices Adhesive
Kev siv cov nplaum nplaum thiab cov sealants hauv kev lag luam hluav taws xob tam sim no tau nthuav dav thiab lawv pab ncaj qha tsis yog rau kev tsim cov khoom siv hluav taws xob nkaus xwb tab sis kuj tseem ua rau lawv txoj haujlwm ntev thiab kev ua haujlwm ntev. Kev siv cov nplaum loj hauv kev lag luam hluav taws xob muaj xws li kev sib txuas ntawm cov khoom siv saum npoo av (SMCs), xaim tacking thiab potting lossis encapsulating Cheebtsam. Lub hauv paus tsev thaiv ntawm kev lag luam hluav taws xob yog cov ntawv xov tooj hluav taws xob lossis, raws li nws feem ntau hu ua, luam tawm Circuit Board (PCB). Lub PCB ua rau siv cov ntaub nplaum nplaum hauv kev sib txuas ntawm cov khoom sib txuas, xov hlau tacking, conformal coatings thiab encapsulating (potting) Cheebtsam.
Peb theem kev ua haujlwm sib txawv yuav tsum raug txiav txim siab thaum xaiv cov nplaum rau cov khoom siv hluav taws xob (lossis lwm yam) cov ntawv thov: cov txheej txheem tsis tau kho los yog ua kua-resin, cov txheej txheem kho (hloov pauv) thiab kho lossis cov khoom siv.
Qhov kev ua tau zoo ntawm cov nplaum nplaum yog qhov tseem ceeb tshaj plaws vim tias nws cuam tshuam rau kev ntseeg tau.
Cov txheej txheem ntawm kev thov cov nplaum kuj tseem ceeb heev, tshwj xeeb yog vim qhov xav tau los xyuas kom meej tias cov nyiaj raug siv rau hauv qhov chaw raug.
Cov txheej txheem tseem ceeb ntawm kev siv cov nplaum nplaum hauv cov ntawv siv hluav taws xob yog kev tshuaj ntsuam luam ntawv (suav cov nplaum los ntawm cov qauv hauv ib qho screen), hloov tus pin (siv ntau tus pin daim phiaj uas qhia cov qauv ntawm cov nplaum nplaum rau lub rooj tsavxwm) thiab daim ntawv thov syringe (nyob rau hauv uas txhaj tshuaj nplaum yog xa los ntawm lub siab tswj lub syringe). Daim ntawv thov syringe yog tej zaum txoj kev nrov tshaj plaws, feem ntau yog los ntawm txoj kev ntawm electro-pneumatically-tswj koob txhaj tshuaj rau nruab nrab ntau lawm ntau hom PCB.
Niaj hnub no, ntau yam ntawm cov nplaum yuav raug txiav txim siab.
Los ntawm lawv qhov xwm txheej, feem ntau cov nplaum, ob qho tib si organic thiab inorganic, tsis yog hluav taws xob conductive. Qhov no siv rau cov khoom siv hluav taws xob xws li epoxies, acrylics, cyanoacrylates, silicones, urethane acrylates thiab cyanoacrylates. Txawm li cas los xij, hauv ntau daim ntawv thov, suav nrog kev sib xyaw ua ke thiab cov khoom siv saum npoo av, cov khoom siv hluav taws xob yuav tsum tau ua.
Txoj kev niaj zaus ntawm kev hloov cov nplaum uas tsis yog-conductive rau cov khoom siv hluav taws xob yog ntxiv cov muab tub lim tsim nyog rau cov khoom siv hauv paus; feem ntau tom kawg yog epoxy resin.
Cov khoom siv uas siv los ua hluav taws xob conductivity yog nyiaj, npib tsib xee thiab carbon. Silver yog siv dav tshaj plaws. Cov nplaum nplaum lawv tus kheej yog nyob rau hauv cov kua los yog daim ntawv ua ntej (cov ntaub nplaum nplaum nplaum tuag ua ntej kev sib txuas rau cov duab xav tau).
Muaj ob hom hluav taws xob conductive nplaum - isotropic thiab anisotropic. Anisotropic adhesives coj nyob rau hauv tag nrho cov lus qhia tab sis ib tug isotropic nplaum ua nyob rau hauv ntsug (z-axis) kev taw qhia nkaus xwb thiab yog li uni-directional.
Cov isotropic adhesives qiv lawv tus kheej kom zoo-kab sib txuas. Nws yuav tsum raug sau tseg tias, muaj txiaj ntsig zoo li cov nplaum nplaum yog, lawv tsis tuaj yeem tsuas yog 'poob rau hauv' raws li kev hloov pauv. Lawv tsis zoo nrog cov tin (los yog tincontaining alloys) los yog nrog txhuas, los yog qhov chaw uas muaj qhov khoob loj lossis qhov chaw uas lawv yuav raug rau cov dej ntub dej (qhuav, ntub dej) hauv kev pabcuam.
Hluav taws xob conductive adhesives
Los ntawm lawv qhov xwm txheej, feem ntau cov nplaum, ob qho tib si organic thiab inorganic, tsis yog hluav taws xob conductive. Qhov no siv rau cov khoom siv hluav taws xob xws li epoxies, acrylics, cyanoacrylates, silicones, urethane acrylates thiab cyanoacrylates. Txawm li cas los xij, hauv ntau daim ntawv thov, suav nrog kev sib xyaw ua ke thiab cov khoom siv saum npoo av, cov khoom siv hluav taws xob yuav tsum tau ua.
Txoj kev niaj zaus ntawm kev hloov cov nplaum uas tsis yog-conductive rau cov khoom siv hluav taws xob yog ntxiv cov muab tub lim tsim nyog rau cov khoom siv hauv paus; feem ntau tom kawg yog epoxy resin.
Cov khoom siv uas siv los ua hluav taws xob conductivity yog nyiaj, npib tsib xee thiab carbon. Silver yog siv dav tshaj plaws.
Cov nplaum nplaum lawv tus kheej yog nyob rau hauv cov kua los yog daim ntawv ua ntej (cov ntaub nplaum nplaum nplaum tuag ua ntej kev sib txuas rau cov duab xav tau).
Muaj ob hom hluav taws xob conductive nplaum - isotropic thiab anisotropic. Anisotropic adhesives coj nyob rau hauv tag nrho cov lus qhia tab sis ib tug isotropic nplaum ua nyob rau hauv ntsug (z-axis) kev taw qhia nkaus xwb thiab yog li uni-directional.
Cov isotropic adhesives qiv lawv tus kheej kom zoo-kab sib txuas. Nws yuav tsum raug sau tseg tias, muaj txiaj ntsig zoo li cov nplaum nplaum yog, lawv tsis tuaj yeem tsuas yog 'poob rau hauv' raws li kev hloov pauv. Lawv tsis zoo nrog cov tin (los yog tincontaining alloys) los yog nrog txhuas, los yog qhov chaw uas muaj qhov khoob loj lossis qhov chaw uas lawv yuav raug rau cov dej ntub dej (qhuav, ntub dej) hauv kev pabcuam.
Thermally conductive nplaum
Miniaturization ntawm cov hluav taws xob hluav taws xob yuav ua rau muaj teeb meem ntawm kev tsim hluav taws xob, uas tuaj yeem ua rau tsis ua hauj lwm ntxov ntawm cov khoom siv hluav taws xob yog tias lawv qhov siab tshaj plaws ua haujlwm kub siab tshaj. Thermally conductive adhesive tuaj yeem siv los muab txoj hauv kev ua cua sov, txuas cov transistors, diodes lossis lwm yam khoom siv hluav taws xob kom haum rau cov dab dej kub kom ntseeg tau tias qhov kub ua kom tsis txhob tshwm sim.
Nws yog xim hlau (hluav taws xob conductive) los yog non-metallic (insulating) hmoov yog sib tov rau hauv daim ntawv nplaum los ua cov viscosity siab (paste) cov nplaum, uas yog cov thermally conductive (piv nrog cov nplaum uas tsis tau sau). Cov txheej txheem thermally conductive feem ntau yog tsim nrog epoxy, silicone thiab acrylics.
Ultraviolet-kho adhesives
Lub teeb-kho nplaum nplaum, coatings thiab encapsulants tau siv nyob rau hauv kev lag luam hluav taws xob tsim khoom nrog ntau zaus vim tias lawv ua tau raws li qhov yuav tsum tau ua rau cov khoom siv thiab kev ua haujlwm hauv kev lag luam no. Cov yam tseem ceeb no suav nrog kev xav tau ib puag ncig (kev puas tsuaj rau cov kuab tshuaj thiab cov khoom ntxiv tsis tas yuav tsum tau), kev tsim khoom-yield txhim kho thiab cov nqi khoom. Lub teeb-kho nplaum nplaum yog yooj yim siv, thiab kho tau sai yam tsis tas yuav tsum tau kho qhov kub thiab txias.
Cov nplaum nplaum feem ntau yog acrylic-based formulations thiab muaj cov duab-initiators uas, thaum qhib los ntawm ultraviolet hluav taws xob, tsim dawb radicals los pib cov txheej txheem polymer-forming (kho). Lub teeb ultraviolet yuav tsum muaj peev xwm nkag mus rau hauv cov khoom siv tsis tau kho - qhov tsis zoo ntawm cov nplaum nplaum. Deposits ntawm resin uas muaj xim tsaus nti, siv tsis tau lossis tuab heev yog qhov nyuaj rau kho.
