Cellulose Ether (CE) yog cov khoom siv polymer hloov kho uas tau los ntawm cov cellulose ntuj thiab siv dav hauv cov ntaub ntawv tsim kho, tshuaj pleev ib ce, tshuaj pleev ib ce thiab lwm yam teb. Muaj ntau hom cellulose ethers, cov feem ntau suav nrog hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC) thiab methylcellulose (MC). Hauv ntau daim ntawv thov, cellulose ethers tau ua pov thawj tias muaj txiaj ntsig zoo hauv kev ruaj khov thiab kev ua tau zoo, ua ib qho tseem ceeb hauv kev txhim kho cov khoom zoo thiab lub neej ua haujlwm.
1. Txhim kho kev ua haujlwm ntawm kev tsim kho
Hauv kev tsim kho vaj tse, cellulose ethers feem ntau siv ua cov khoom ua kom tuab, cov neeg sawv cev khaws dej thiab cov khoom khi. Hauv cov khoom siv mortar, gypsum thiab cov khoom siv cement, qhov ua kom tuab ntawm cellulose ether ua rau cov khoom siv ntau dua thiab yas thaum lub sijhawm tsim kho, zam kev los ntshav thiab teeb meem sib cais. Cellulose ether kuj txhim kho lub zog sib txuas ntawm cov khoom siv, ua kom ntseeg tau tias cov khoom siv tuaj yeem faib sib npaug thaum lub sijhawm tsim kho thiab muaj kev sib txuas zoo dua rau lub substrate.
Hydroxypropyl methylcellulose (HPMC) tuaj yeem txhim kho kev ua haujlwm ntawm cov mortar, ua rau nws yooj yim dua rau kev siv thiab tsis tshua muaj peev xwm swb, tshwj xeeb tshaj yog hauv kev tsim kho ntsug. Tsis tas li ntawd, qhov cuam tshuam ntawm cellulose ether tuaj yeem ncua lub sijhawm ua haujlwm ntawm cov mortar, uas yog qhov zoo rau kev tsim kho kom raug ntawm cov haujlwm nyuaj. Cov yam ntxwv no txhim kho kev ua haujlwm zoo thiab zoo ntawm kev txo cov khoom pov tseg thiab kev ua yuam kev hauv kev tsim kho.
2. Kev khaws dej zoo heev
Ib qho ntawm cov khoom tseem ceeb ntawm cellulose ethers yog lawv cov khoom zoo heev uas khaws dej. Kev khaws dej yog hais txog lub peev xwm ntawm cellulose ether los nqus thiab khaws cov dej noo hauv cov khoom, tiv thaiv kev ua kom qhuav ua ntej lossis kev nqus dej noo, yog li ua kom muaj zog thiab ruaj khov ntawm cov khoom tom qab kev tsim kho. Hauv cov ntaub ntawv tsim kho xws li cov khoom siv cement thiab gypsum, cov dej khaws cia ntawm cellulose ether ua kom ntseeg tau tias dej tuaj yeem koom nrog tag nrho hauv cov txheej txheem tshuaj tiv thaiv thaum lub sijhawm ua kom dej noo, zam kev tawg ntawm cov khoom thiab lub zog tsis txaus los ntawm kev poob dej ua ntej.
Cov yam ntxwv khaws dej yog qhov tseem ceeb rau kev tsim cov txheej nyias nyias. Piv txwv li, thaum lub sijhawm ua cov vuas vov, cellulose ethers tuaj yeem pab tiv thaiv kom cov dej noo hauv cov mortar tsis txhob poob sai dhau, yog li txhim kho qhov kev nplaum thiab kev ruaj khov ntawm cov vuas vov. Ib yam li ntawd, hauv thaj chaw ntawm cov txheej txheej, cellulose ethers tuaj yeem tiv thaiv kom cov dej noo tsis txhob qhuav ua ntej, ua rau cov txheej txheej tsim ib qho chaw sib xws thiab ntom, ntev lub neej ntawm cov txheej txheej thiab txo qhov xav tau kev saib xyuas tom qab.
3. Txhim kho qhov tiv taus huab cua ntawm cov ntaub ntawv
Daim ntawv thov ntawm cellulose ethers kuj tseem tuaj yeem txhim kho cov khoom siv huab cua, piv txwv li nws txoj kev tiv thaiv rau cov yam ntxwv ib puag ncig xws li dej noo, UV rays, huab cua thiab kub heev. Qhov no yog qhov tseem ceeb rau kev ruaj khov mus sij hawm ntev ntawm cov khoom siv hauv tsev. Piv txwv li, daim ntawv thov ntawm cellulose ethers hauv cov txheej txheej tuaj yeem txhim kho qhov zoo ntawm cov zaj duab xis ntawm cov txheej thiab ua rau kom muaj qhov ceev ntawm cov txheej, yog li txhim kho cov txheej tiv thaiv rau cov duab ultraviolet thiab tiv thaiv kev ploj thiab kev laus.
Hauv cov ntaub ntawv ua los ntawm cov cement, cellulose ether tuaj yeem txhim kho qhov khaws dej, txo qhov cuam tshuam ntawm kev ziab thaum lub sijhawm ua kom cov cement tawv, thiab txo qhov kev pheej hmoo ntawm kev tawg, yog li txhim kho kev tiv thaiv khov-thaw thiab kev tiv thaiv huab cua. Qhov no tso cai rau lub tsev kom tswj tau nws cov qauv thiab kev zoo nkauj rau lub sijhawm ntev dua hauv huab cua hnyav.
4. Kev kho kom tuab thiab rheology zoo heev
Qhov ua kom tuab ntawm cellulose ether hauv cov kua dej tso cai rau nws kho cov khoom rheological ntawm cov khoom siv (xws li viscosity, yield stress, thiab lwm yam), yog li txhim kho qhov ruaj khov thiab yooj yim ntawm kev siv cov khoom. Hauv cov txheej thiab cov xim, cellulose ethers kho qhov viscosity ntawm cov xim kom ntseeg tau tias nws tsis sag lossis drip thaum lub sijhawm thov thiab tsim kom du, txawm tias txheej. Qhov no tsis tsuas yog txhim kho kev tswj hwm ntawm kev tsim kho, tab sis kuj tseem txhim kho qhov hnav tsis kam thiab tawg tsis kam ntawm cov txheej.
Cov cellulose ethers kuj ua lub luag haujlwm tseem ceeb hauv cov ntaub ntawv hauv pem teb uas nws tus kheej ua tau. Nws cov haujlwm ua kom tuab thiab kho qhov rheological ua kom cov khoom siv tswj tau qhov zoo thiab qhov nws tus kheej ua tau thaum lub sijhawm nchuav, txo qhov tsim ntawm cov npuas thiab qhov tsis zoo, thiab thaum kawg txhim kho qhov tiaj tus thiab ruaj khov ntawm hauv pem teb.
5. Txhim kho qhov tawg tsis kam ntawm cov ntaub ntawv
Cov dej tuav thiab cov nyhuv ua kom tuab ntawm cellulose ether pab tswj qhov ceev ntawm cov khoom qhuav thiab zam kev ntsws thiab tawg teeb meem los ntawm kev poob dej ntau dhau. Tshwj xeeb tshaj yog nyob rau hauv cov khoom siv mortar thiab cement, cellulose ether tuaj yeem sib npaug cov dej noo hauv cov khoom thiab txo qhov tshwm sim ntawm cov kab nrib pleb ntsws. Tsis tas li ntawd, nws cov khoom sib txuas zoo dua kuj ua rau cov khoom sib txuas zoo dua nrog lub substrate thiab txhim kho qhov tawg tsis kam ntawm tag nrho cov qauv.
Hauv cov ntaub ntawv gypsum-based, cellulose ethers tiv thaiv cov kab nrib pleb ntawm qhov chaw los ntawm kev poob dej sai, ua rau cov txheej txheem phab ntsa thiab qab nthab ruaj khov dua thiab du thaum ziab. Qhov kev tiv thaiv kab nrib pleb no tsis yog tsuas yog txhim kho qhov zoo ntawm cov khoom siv xwb, tab sis kuj ua rau nws lub neej ua haujlwm ntev dua.
6. Txhim kho kev tiv thaiv xeb thiab tshuaj lom neeg tiv thaiv
Cellulose ethers kuj tseem tuaj yeem txhim kho qhov corrosion thiab tshuaj lom neeg tsis kam ntawm cov ntaub ntawv hauv qee qhov kev siv. Los ntawm kev ua kom cov khoom siv ntom dua thiab tiv taus dej ntau dua, cellulose ethers tuaj yeem txo qhov kev tawm tsam ntawm cov tshuaj lom neeg lossis dej noo ntawm cov khoom. Qhov no yog qhov tseem ceeb heev hauv qee qhov chaw tshwj xeeb, xws li cov nroj tsuag tshuaj, cov chaw nyob hauv dej hiav txwv lossis cov chaw muaj av noo siab.
Daim ntawv thov ntawm cellulose ethers hauv cov txheej txheem dej tsis tsuas yog txhim kho qhov ruaj khov ntawm cov txheej txheem, tab sis kuj txhim kho qhov tsis kam rau cov tshuaj xws li cov kua qaub, alkalis, thiab ntsev, yog li ua kom lub neej ua haujlwm ntawm cov khoom siv ntev dua thiab txo tus nqi kho thiab hloov pauv.
7. Kev tiv thaiv ib puag ncig ntsuab thiab kev txhim kho kom ruaj khov
Cellulose ether yog qhov tseem ceeb yog cov khoom siv ntsuab thiab tus phooj ywg ib puag ncig vim nws yog los ntawm cov nroj tsuag cellulose ntuj thiab yog biodegradable. Piv nrog cov ntaub ntawv polymer hluavtaws, cellulose ethers muaj kev cuam tshuam tsawg dua rau ib puag ncig thiab tsis tso tawm cov tshuaj lom neeg thaum lub sijhawm tsim khoom. Yog li ntawd, kev siv dav ntawm cellulose ethers ua tau raws li cov kev xav tau tam sim no ntawm kev tiv thaiv ib puag ncig thiab kev txhim kho ruaj khov hauv kev lag luam kev tsim kho.
Qhov zoo ntawm cellulose ethers hais txog kev ruaj khov thiab kev ua tau zoo feem ntau yog pom tseeb hauv lawv cov dej zoo heev, thickening, adhesion thiab huab cua tsis kam. Nws tsis tsuas yog txhim kho kev ua tau zoo ntawm cov ntaub ntawv tsim kho, tab sis kuj tseem txhim kho cov khoom siv qhov tawg tsis kam, ruaj khov thiab corrosion tsis kam, thiab ntev lub neej kev pabcuam ntawm cov khoom. Tsis tas li ntawd, cov khoom ntsuab thiab tus phooj ywg ib puag ncig ntawm cellulose ether kuj ua rau nws yog ib feem tseem ceeb ntawm kev txhim kho cov ntaub ntawv tsim kho yav tom ntej.
Lub sijhawm tshaj tawm: Cuaj hlis-18-2024