Cellulose Ether (CE) yog cov khoom siv polymer hloov pauv tau los ntawm cov cellulose ntuj thiab yog siv dav hauv cov khoom siv hauv tsev, txheej, tshuaj, tshuaj pleev ib ce thiab lwm yam. Muaj ntau hom cellulose ethers, uas muaj xws li hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC) thiab methylcellulose (MC). Hauv ntau daim ntawv thov, cellulose ethers tau pom qhov zoo ntawm qhov ua tau zoo thiab kev ua tau zoo, dhau los ua ib qho tseem ceeb hauv kev txhim kho cov khoom zoo thiab kev pabcuam lub neej.
1. Txhim kho kev tsim kho kev ua haujlwm
Hauv kev tsim cov khoom siv hauv tsev, cellulose ethers feem ntau yog siv los ua cov thickeners, dej tuav cov neeg ua haujlwm thiab cov ntaub ntawv sib khi. Nyob rau hauv mortar, gypsum thiab cement-based cov ntaub ntawv, cov nyhuv thickening ntawm cellulose ether ua rau cov khoom siv dej ntau thiab yas thaum lub sij hawm tsim kho, tsis txhob muaj teeb meem los ntshav thiab kev sib cais. Cellulose ether kuj tseem txhim kho kev sib txuas ntawm cov khoom siv, kom ntseeg tau tias cov khoom tuaj yeem sib npaug sib npaug thaum lub sijhawm ua haujlwm tsim kho thiab muaj kev sib raug zoo rau lub substrate.
Hydroxypropyl methylcellulose (HPMC) tuaj yeem txhim kho kev ua haujlwm ntawm mortar, ua kom yooj yim rau kev thov thiab tsis tshua muaj kev swb, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho ntsug. Tsis tas li ntawd, cov nyhuv retarding ntawm cellulose ether tuaj yeem txuas ntxiv lub sijhawm ua haujlwm ntawm mortar, uas yog qhov zoo rau kev tsim kho ntawm cov haujlwm nyuaj. Cov yam ntxwv no ntxiv txhim kho kev tsim kho kom zoo thiab ua tau zoo nyob rau hauv cov nqe lus ntawm kev txo cov khoom pov tseg thiab kev tsim kho yuam kev.
2. Cov dej tuav tau zoo heev
Ib qho ntawm cov khoom tseem ceeb ntawm cellulose ethers yog lawv cov dej tuav zoo heev. Kev tuav dej yog hais txog lub peev xwm ntawm cellulose ether kom nqus thiab khaws cov dej noo hauv cov khoom, tiv thaiv kom tsis txhob muaj evaporation los yog seepage ntawm noo noo, yog li ua kom lub zog thiab kav ntev ntawm cov khoom tom qab kev tsim kho. Hauv cov khoom siv hauv tsev xws li cement-based thiab gypsum-raws li cov khoom, cov dej tuav cov nyhuv ntawm cellulose ether ua kom cov dej tuaj yeem koom nrog cov txheej txheem tshuaj tiv thaiv thaum lub sij hawm hydration cov tshuaj tiv thaiv, zam cov khoom tawg thiab tsis muaj zog los ntawm kev poob dej ntxov ntxov.
Cov khoom tuav dej yog qhov tseem ceeb tshwj xeeb rau kev tsim cov txheej txheej nyias. Piv txwv li, thaum lub sij hawm tiling txheej txheem, cellulose ethers yuav pab tiv thaiv kom txhob ya raws nyob rau hauv lub mortar los ntawm poob sai heev, yog li txhim kho cov adhesion thiab durability ntawm cov vuas. Ib yam li ntawd, nyob hauv thaj teb ntawm cov txheej txheem, cellulose muaj kev hais ua cell tuaj yeem ua ib qho kev sib tw thaum lub neej ntawm txheej thiab txo qhov xav tau tom qab txij nkawm.
3. Txhim kho huab cua tsis kam ntawm cov ntaub ntawv
Daim ntawv thov ntawm cellulose ethers tuaj yeem txhim kho cov khoom siv huab cua, piv txwv li nws tiv thaiv ib puag ncig xws li ya raws, UV rays, huab cua thiab huab cua kub. Qhov no yog qhov tseem ceeb rau lub sijhawm ntev ntawm cov khoom siv hauv tsev. Piv txwv li, daim ntawv thov ntawm cellulose ethers nyob rau hauv coatings yuav txhim kho cov zaj duab xis-forming zoo ntawm lub txheej thiab ua rau kom qhov ntom ntawm txheej, yog li txhim kho cov txheej tiv thaiv rau ultraviolet rays thiab tiv thaiv fading thiab aging.
Nyob rau hauv cov ntaub ntawv cement-based, cellulose ether tuaj yeem txhim kho cov dej tuav, txo qhov ziab kom qhuav thaum lub sij hawm cement hardening, thiab txo qhov kev pheej hmoo ntawm kev tawg, yog li txhim kho khov-thaw kuj thiab huab cua tsis kam. Qhov no tso cai rau lub tsev tswj hwm nws cov qauv kev ncaj ncees thiab kev zoo nkauj rau lub sijhawm ntev dua hauv cov huab cua hnyav.
4. Zoo heev thickening thiab rheology hloov
Cov nyhuv thickening ntawm cellulose ether nyob rau hauv aqueous tov tso cai rau nws los kho cov rheological zog ntawm cov khoom (xws li viscosity, yield stress, thiab lwm yam), yog li txhim kho cov stability thiab yooj yim ntawm kev siv ntawm cov khoom. Hauv cov coatings thiab xim, cellulose ethers kho cov viscosity ntawm cov xim kom paub tseeb tias nws tsis sag los yog poob thaum lub sij hawm thov thiab tsim ib tug du, txawm 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 txheej.
Cellulose ethers kuj ua lub luag haujlwm tseem ceeb hauv cov khoom siv hauv pem teb tus kheej. Nws cov thickening thiab rheological hloov ua haujlwm kom ntseeg tau tias cov khoom siv tswj tau zoo fluidity thiab nws tus kheej-leveling zog thaum lub sij hawm pouring txheej txheem, txo cov tiam ntawm npuas thiab tsis xws luag, thiab thaum kawg txhim kho lub flatness thiab durability ntawm hauv pem teb.
5. Txhim kho qhov tawg tsis kam ntawm cov ntaub ntawv
Cov dej tuav thiab thickening cuam tshuam ntawm cellulose ether pab tswj kom qhuav ceev ntawm cov khoom thiab tsis txhob shrinkage thiab cracking teeb meem tshwm sim los ntawm cov dej noo ntau dhau. Tshwj xeeb tshaj yog nyob rau hauv mortar thiab cement-raws li cov ntaub ntawv, cellulose ether tuaj yeem sib cais cov dej noo nyob rau hauv cov khoom thiab txo qhov tshwm sim ntawm shrinkage tawg. Tsis tas li ntawd, nws txoj kev txhim kho kev sib raug zoo kuj tseem ua rau cov khoom siv kom zoo dua nrog cov substrate thiab txhim kho qhov tawg tsis kam ntawm tag nrho cov qauv.
Hauv cov khoom siv gypsum, cellulose ethers tiv thaiv cov kab nrib pleb uas tshwm sim los ntawm kev poob dej sai, ua rau phab ntsa thiab qab nthab coatings ruaj khov thiab du thaum ziab. Qhov kev tiv thaiv tawg no tsis yog tsuas yog txhim kho qhov zoo ntawm cov khoom, tab sis kuj txuas nws lub neej kev pab cuam.
6. Txhim kho corrosion kuj thiab tshuaj tiv thaiv
Cellulose ethers tuaj yeem txhim kho corrosion thiab tshuaj tiv thaiv ntawm cov ntaub ntawv hauv qee yam kev siv. Los ntawm kev ua cov khoom denser thiab dej-resistant ntau, cellulose ethers tuaj yeem txo qhov kev tawm tsam ntawm cov tshuaj phem lossis cov dej noo ntawm cov khoom. Qhov no yog qhov tseem ceeb hauv qee qhov chaw tshwj xeeb, xws li cov nroj tsuag tshuaj, dej hiav txwv lossis thaj chaw muaj av noo.
Daim ntawv thov ntawm cellulose ethers nyob rau hauv waterproof coatings tsis tsuas yog txhim kho lub durability ntawm txheej, tab sis kuj txhim khu kev tiv thaiv rau cov tshuaj xws li acids, alkalis, thiab ntsev, yog li ncua lub neej kev pab cuam ntawm cov khoom thiab txo tus nqi ntawm kev kho thiab hloov.
7. Kev tiv thaiv ib puag ncig ntsuab thiab kev tsim kho kom ruaj khov
Cellulose ether yog qhov tseem ceeb ntawm cov khoom ntsuab thiab ib puag ncig tus phooj ywg vim nws yog muab los ntawm cov nroj tsuag ntuj cellulose thiab yog biodegradable. Piv nrog cov khoom siv hluavtaws polymer, cellulose ethers muaj kev cuam tshuam tsawg dua rau ib puag ncig thiab tsis tso cov khoom tsis zoo thaum lub sijhawm tsim khoom. Yog li ntawd, daim ntawv thov dav ntawm cellulose ethers ua tau raws li cov cai tam sim no ntawm kev tiv thaiv ib puag ncig thiab kev tsim kho kom ruaj khov hauv kev tsim kho kev lag luam.
Qhov zoo ntawm cellulose ethers nyob rau hauv cov nqe lus ntawm durability thiab kev ua tau zoo yog tsuas yog xav txog nyob rau hauv lawv zoo heev dej tuav, thickening, adhesion thiab huab cua tsis kam. Nws tsis tsuas yog txhim kho kev tsim kho kev ua haujlwm ntawm cov khoom siv hauv tsev, tab sis kuj tseem txhim kho cov khoom siv tawg ua haujlwm, ua haujlwm ntev thiab corrosion kuj, thiab txuas ntxiv lub neej kev pab cuam ntawm cov khoom. Tsis tas li ntawd, cov khoom ntsuab thiab ib puag ncig zoo ntawm cellulose ether kuj ua rau nws yog ib feem tseem ceeb ntawm kev tsim cov khoom siv hauv tsev yav tom ntej.
Post lub sij hawm: Sep-18-2024