Cellulose ethers yog ib hom polymer compound tsim los ntawm kev hloov kho ntuj cellulose. Lawv muaj cov yam ntxwv ntawm lub cev thiab tshuaj lom neeg thiab tau siv dav hauv ntau yam nplaum. Vim muaj cov khoom zoo heev ntawm cellulose ether, nws siv hauv cov nplaum tsis yog tsuas yog txhim kho kev sib raug zoo ntawm cov khoom, tab sis kuj coj cov kev txhim kho xws li kev ruaj ntseg, thickening, dej tuav, thiab lubrication.
1. Thickening nyhuv
Ib qho ntawm cov haujlwm tseem ceeb ntawm cellulose ethers yog thickening, uas ua rau lawv muaj txiaj ntsig zoo hauv cov dej-raws li nplaum nplaum. Lub viscosity ntawm cov nplaum yog qhov tseem ceeb rau nws daim ntawv thov kev ua tau zoo, thiab cellulose ethers tuaj yeem ua rau kom cov viscosity ntawm cov nplaum los ntawm kev tsim cov qauv sib txawv ntawm cov qauv molecular. Cellulose ethers xws li hydroxypropyl methylcellulose (HPMC) thiab hydroxyethyl cellulose (HEC) muaj cov nyhuv thickening zoo, thiab lawv cov khoom thickening tuaj yeem hloov kho nrog cov kev hloov hauv molecular hnyav, qib ntawm kev hloov thiab lwm yam. Lub thickened adhesive tsis tsuas yog yooj yim txheej, tab sis kuj txhim khu kev sib txuas, ua rau nws siv dav hauv kev tsim cov nplaum, ntawv cov khoom nplaum, thiab lwm yam.
2. Muab dej tuav
Kev tuav dej yog lwm txoj haujlwm tseem ceeb ntawm cellulose ethers hauv cov nplaum. Cellulose ethers yog tshwj xeeb tshaj yog haum rau cov dej-raws li cov nplaum nplaum, uas tuaj yeem khaws cov dej noo thiab tiv thaiv cov colloid kom qhuav sai heev. Qhov no yog qhov tshwj xeeb tshaj yog rau cov cheeb tsam uas cov dej noo evaporates sai heev. Piv txwv li, nyob rau hauv cement-based los yog gypsum-raws li adhesives nyob rau hauv kev tsim kho kev lag luam, cellulose ethers tuaj yeem nqus dej, nthuav dav thiab tsim cov yeeb yaj kiab hydration, ncua sij hawm ua haujlwm ntawm cov nplaum thiab ua kom muaj kev nyab xeeb thaum ua haujlwm. Bonding zog tsis degraded los ntawm qhuav ntxov ntxov. Cov yam ntxwv no kuj tseem siv tau rau thaj chaw xws li phab ntsa pleev xim thiab cov nplais nplaum uas xav tau los tswj cov dej evaporation.
3. Txhim khu kev sib txuas thiab adhesion zog
Qhov sib ntxiv ntawm cellulose ether tuaj yeem tsis tsuas yog tuab thiab khaws cov dej, tab sis kuj tseem txhim kho lub zog nplaum ntawm cov nplaum. Cov pab pawg ua haujlwm xws li hydroxyl thiab ether bonds hauv nws cov qauv molecular tuaj yeem tsim hydrogen bonds thiab lwm yam kev sib cuam tshuam ntawm lub cev thiab tshuaj lom neeg nrog rau qhov chaw ntawm adherend, yog li txhim kho cov nplaum nplaum. Qhov no ua rau cellulose ethers zoo heev hauv daim ntawv sib txuas, ntoo, ceramics thiab lwm yam ntaub ntawv. Lub versatility ntawm cellulose ethers muab cov nplaum zoo dua adhesion thiab kev tsim kho yooj yim, tso cai rau nws siv tau zoo heev bonding zog ntawm ntau yam substrates.
4. Txhim khu kev ruaj ntseg thiab plam tsis kam
Hauv kev tsim cov kua nplaum lossis lwm cov nplaum nplaum nplaum, cellulose ethers tuaj yeem txhim kho qhov kev ua haujlwm tsis zoo ntawm lub cev. Cellulose ether tuaj yeem tsim cov qauv kev sib txuas hauv cov ntawv khi, txwv tsis pub cov dej ntws ntawm cov ntawv khi, yog li cov coated binder tuav ib daim ntawv ruaj khov thiab yuav tsis plam vim lub ntiajteb txawj nqus lossis lwm yam, tshwj xeeb tshaj yog qhov tseem ceeb hauv kev tsim kho ib puag ncig xws li pobzeb tso. . Tsis tas li ntawd, cellulose ether kuj tseem tuaj yeem muab cov nplaum nplaum zoo los tiv thaiv kev daws teeb meem, tsis txhob delamination thaum khaws cia thiab siv, thiab xyuas kom muaj kev sib luag thiab kev ua haujlwm ntev ntawm cov nplaum.
5. Txhim kho kev tsim kho kev ua haujlwm
Cellulose ether muaj lubricity zoo thiab dispersibility, uas zoo heev txhim kho nws workability nyob rau hauv cov nplaum. Adhesives siv cellulose ether tsis tsuas yog yooj yim rau kev thov, tab sis kuj tuaj yeem tsim cov nplaum nplaum uas tsis muaj qhov tuab, txo cov hlua thaum siv thiab txhim kho cov neeg siv kev paub. Nyob rau tib lub sijhawm, kev siv cov cellulose ether tuaj yeem txo qhov shrinkage ntawm cov nplaum, txo cov teeb meem tawg lossis tev tom qab txheej, thiab txhim kho kev ruaj ntseg thiab ua haujlwm ntawm cov txheej txheem sib txuas.
6. Txhim khu kev tiv thaiv kom khov-thaw mus
Hauv qee qhov chaw thov tshwj xeeb, cov nplaum yuav tsum tau ua ntau lub voj voog khov-thaw, xws li kev tsim kho sab nraum zoov, kev thauj mus los thiab lwm qhov chaw. Cellulose ether muaj kev tiv thaiv zoo heev khov-thaw, uas tuaj yeem tswj kev ruaj ntseg ntawm cov nplaum nyob rau hauv qhov kub thiab txias thiab tiv thaiv cov nplaum los ntawm kev puas tsuaj thaum lub sij hawm khov-thaw. Los ntawm nws cov qauv molecular ruaj khov, cellulose ether tuaj yeem tswj cov nplaum nplaum cov khoom sib txuas txawm tias qhov kub hloov pauv, ua rau nws ntseeg tau nyob rau hauv huab cua huab cua. Qhov no yog ib qho tseem ceeb tshwj xeeb rau cov tshuab nplaum uas yuav tsum tau muaj kev cuam tshuam sab nraum zoov mus ntev.
7. Muab kev tiv thaiv ib puag ncig
Raws li ib tug derivative ntawm natural cellulose, cellulose ethers muaj biodegradability zoo heev thiab kev tiv thaiv ib puag ncig. Tsis zoo li cov khoom siv hluavtaws, cellulose ethers yog muab los ntawm cov khoom siv txuas ntxiv dua tshiab thiab yuav tsis ua rau muaj kuab paug rau ib puag ncig tom qab siv. Tsis tas li ntawd, cellulose ethers muaj tsawg emissions ntawm volatile organic tebchaw (VOC) thaum lub sij hawm tsim thiab siv, thiab ua raws li cov kev cai ntawm niaj hnub kev cai ib puag ncig. Yog li ntawd, nyob rau hauv lub formulation tsim ntawm ib puag ncig tus phooj ywg adhesives, cellulose ethers tau maj mam ua zoo tagnrho thickeners thiab adhesives. Binder raw cov ntaub ntawv.
8. Kev siv ntau yam
Vim lawv muaj ntau yam, cellulose ethers ua lub luag haujlwm tseem ceeb hauv daim ntawv thov nplaum thoob plaws ntau qhov kev lag luam. Ua ntej tshaj plaws, hauv kev tsim kho, cellulose ethers tau siv dav hauv cov cement-based thiab gypsum-based adhesives los muab kev tsim kho kev ua tau zoo thiab kev sib raug zoo. Tsis tas li ntawd, cellulose ethers kuj tau siv rau hauv ntim thiab ntawv cov khoom nplaum. Lawv cov dej tuav thiab cov khoom thickening zoo txhim kho cov txiaj ntsig kev sib raug zoo thiab ua haujlwm ntev ntawm daim ntawv. Cellulose ethers kuj tseem siv rau hauv cov kua nplaum kho mob, kua nplaum khoom noj thiab lwm yam. Vim lawv cov khoom tsis muaj tshuaj lom, tsis muaj ntxhiab thiab ruaj khov, lawv ua tau raws li cov kev cai nruj rau cov nplaum hauv cov teb no.
Raws li ib tug multifunctional polymer cov ntaub ntawv, cellulose ether muaj broad zeem muag rau daim ntawv thov nyob rau hauv adhesives. Nws zoo heev txhim kho kev ua tau zoo ntawm cov nplaum thiab ua tau raws li qhov xav tau ntawm cov nplaum nplaum zoo hauv kev lag luam niaj hnub thiab kev tsim kho los ntawm kev ua haujlwm xws li thickening, dej tuav, txhim kho adhesion, txhim khu kev ruaj ntseg, thiab txhim kho kev ua haujlwm. Nrog rau kev nce qib txuas ntxiv ntawm kev tshawb fawb thiab thev naus laus zis thiab tib neeg cov kev xav tau ntau ntxiv rau kev tiv thaiv ib puag ncig, lub luag haujlwm ntawm cellulose ethers hauv cov nplaum yuav dhau los ua qhov tseem ceeb, thiab cov kev cia siab rau yav tom ntej yuav dav dua.
Post lub sij hawm: Sep-24-2024