Focus on Cellulose ethers

Kev paub txog cellulose ether

Cellulose ether (CelluloseEther) yog tsim los ntawm cellulose los ntawm etherification cov tshuaj tiv thaiv ntawm ib los yog ob peb etherification agents thiab qhuav sib tsoo. Raws li cov qauv tshuaj sib txawv ntawm ether substituents, cellulose ethers tuaj yeem muab faib ua anionic, cationic thiab nonionic ethers. Ionic cellulose ethers feem ntau suav nrog carboxymethyl cellulose (CMC); Tsis yog-ionic cellulose ethers feem ntau suav nrog methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC) thiab hydroxyethyl cellulose Ether (HC), thiab lwm yam. Tsis-ionic ethers muab faib ua dej-soluble ethers thiab roj-soluble ethers, thiab tsis -ionic dej-soluble ethers yog tsuas yog siv nyob rau hauv mortar khoom. Nyob rau hauv lub xub ntiag ntawm calcium ions, ionic cellulose ether yog tsis ruaj tsis khov, yog li nws tsis tshua muaj siv nyob rau hauv qhuav-mixed mortar khoom uas siv cov cement, slaked txiv qaub, thiab lwm yam raws li cov ntaub ntawv cementing. Nonionic dej-soluble cellulose ethers yog dav siv nyob rau hauv lub tsev cov ntaub ntawv kev lag luam vim hais tias ntawm lawv suspension stability thiab dej tuav.

01. Tshuaj lom neeg ntawm cellulose ether

Txhua cellulose ether muaj cov qauv ntawm cellulose - anhydroglucose qauv. Nyob rau hauv tus txheej txheem ntawm kev tsim cellulose ether, cellulose fiber yog thawj rhuab nyob rau hauv ib tug alkaline tov, thiab ces kho nrog ib tug etherifying tus neeg sawv cev. Cov khoom siv tshuaj tiv thaiv fibrous yog purified thiab pulverized los ua cov hmoov sib xws nrog ib qho kev nplua nuj.

propylene oxide yog siv kom tau txais cov khoom siv hydroxypropyl ntxiv rau methane chloride hauv kev tsim HPMC. Ntau yam cellulose ethers muaj qhov sib txawv ntawm methyl thiab hydroxypropyl hloov pauv, uas cuam tshuam rau cov organic compatibility thiab thermal gelation kub ntawm cellulose ether daws.

Hauv kev tsim khoom ntawm MC, tsuas yog methyl chloride yog siv los ua tus neeg sawv cev etherification

02. Daim ntawv thov scenarios ntawm cellulose ether:

Cellulose ether yog non-ionic semi-synthetic siab molecular polymer, uas yog dej-soluble thiab hnyav-soluble. Nws muaj cov teebmeem sib txawv hauv kev lag luam sib txawv. Piv txwv li, hauv cov khoom siv tshuaj lom neeg, nws muaj cov teebmeem hauv qab no:

① Dej tuav tus neeg saib xyuas ②Thickener ③Leveling cuab yeej ④Film tsim khoom ⑤Binder

Hauv kev lag luam polyvinyl chloride, nws yog emulsifier thiab dispersant; nyob rau hauv kev lag luam kws tshuaj, nws yog ib tug binder thiab ib tug qeeb thiab tswj cov ntaub ntawv tso tawm lub moj khaum, thiab lwm yam. Vim hais tias cellulose muaj ib tug ntau yam ntawm composite cov teebmeem, nws daim ntawv thov ntawm lub teb kuj yog feem ntau nws kim heev. Cov hauv qab no tsom rau kev siv thiab kev ua haujlwm ntawm cellulose ether hauv ntau yam khoom siv hauv tsev.

(1) Hauv phab ntsa scraping putty:

Tam sim no, nyob rau hauv ntau lub nroog hauv kuv lub teb chaws, cov dej-resistant thiab txhuam-resistant ib puag ncig-phooj ywg putty tau pib muaj nuj nqis los ntawm tib neeg. Nws yog tsim los ntawm acetal cov tshuaj tiv thaiv ntawm vinyl cawv thiab formaldehyde. Yog li ntawd, cov khoom no maj mam tshem tawm los ntawm tib neeg, thiab cov khoom siv cellulose ether yog siv los hloov cov khoom siv no. Qhov ntawd yog hais tias, rau kev tsim cov khoom siv hauv tsev, cellulose yog tam sim no tsuas yog cov khoom siv.

Nyob rau hauv dej-resistant putty, nws muab faib ua ob hom: qhuav hmoov putty thiab putty muab tshuaj txhuam. Ntawm ob hom putty, hloov kho methyl cellulose thiab hydroxypropyl methyl yuav tsum tau xaiv. Lub viscosity specification feem ntau yog nyob ntawm 30000-60000cps. Lub luag haujlwm tseem ceeb ntawm cellulose hauv putty yog dej tuav, sib txuas thiab lubrication. Txij li cov qauv putty ntawm ntau lub tuam txhab sib txawv, qee qhov yog cov calcium grey, lub teeb calcium, cov cement dawb, thiab lwm yam, thiab qee qhov yog gypsum hmoov, grey calcium, lub teeb calcium, thiab lwm yam, yog li cov specifications, viscosity thiab nkag mus ntawm cellulose nyob rau hauv lub ob tug qauv kuj txawv. Tus nqi ntxiv yog li 2‰-3‰. Nyob rau hauv kev tsim kho ntawm phab ntsa scraping putty, txij li thaum lub hauv paus nto ntawm phab ntsa muaj ib tug tej yam degree ntawm nqus dej (qhov nqus dej ntawm phab ntsa cib yog 13%, thiab cov dej nqus tus nqi ntawm cov pob zeb yog 3-5%), ua ke nrog cov evaporation ntawm lub ntiaj teb sab nraud, yog hais tias lub putty poob dej sai heev, Nws yuav ua rau tawg los yog hmoov tshem tawm, uas yuav ua rau lub zog ntawm putty tsis muaj zog. Yog li ntawd, ntxiv cellulose ether yuav daws tau qhov teeb meem no. Tab sis qhov zoo ntawm cov muab tub lim, tshwj xeeb tshaj yog qhov zoo ntawm cov hmoov tshauv calcium kuj tseem ceeb heev.

Vim lub siab viscosity ntawm cellulose, lub buoyancy ntawm lub putty kuj txhim kho, thiab sagging tshwm sim thaum lub sij hawm tsim kho kuj zam, thiab nws yog ntau xis thiab zog-txuag tom qab scraping. Nws yog tsim nyog los ntxiv cellulose ether ntau nyob rau hauv cov hmoov putty. Nws ntau lawm thiab siv tau yooj yim dua. Cov muab tub lim thiab cov khoom ntxiv tuaj yeem sib xyaw ua ke hauv cov hmoov qhuav.

(2) Pob zeb mortar:

Nyob rau hauv pob zeb mortar, kom ua tiav lub zog kawg, cov cement yuav tsum tau hydrated tag nrho. Tshwj xeeb tshaj yog nyob rau hauv lub caij ntuj sov kev tsim kho, lub pob zeb mortar poob dej sai heev, thiab cov kev ntsuas ntawm tiav hydration yog siv los tswj thiab sprinkle dej. Cov khoom siv pov tseg thiab kev ua haujlwm tsis yooj yim, qhov tseem ceeb yog cov dej tsuas yog nyob rau saum npoo, thiab cov dej hauv sab hauv tseem tsis tiav, yog li kev daws teeb meem no yog ntxiv cov dej tuav cov neeg sawv cev cellulose rau hauv cov pob zeb, feem ntau xaiv hydroxypropyl methyl. los yog methyl fiber Cov viscosity specification yog nyob nruab nrab ntawm 20000-60000cps, thiab tus nqi ntxiv yog 2%-3%. Cov dej tuav tus nqi tuaj yeem nce mus rau ntau dua 85%. Txoj kev siv hauv mortar pob zeb yog sib tov cov hmoov qhuav sib npaug thiab muab tso rau hauv dej.

(3) Nyob rau hauv plastering gypsum, bonded gypsum, thiab caulking gypsum:

Nrog rau kev loj hlob sai ntawm kev tsim kho kev lag luam, tib neeg qhov kev thov rau cov khoom siv hauv tsev tshiab kuj nce ntxiv. Vim muaj kev nce hauv tib neeg kev paub txog kev tiv thaiv ib puag ncig thiab kev txhim kho txuas ntxiv ntawm kev tsim kho, cov khoom siv cementitious gypsum tau tsim sai heev. Tam sim no, feem ntau cov khoom siv gypsum yog plastering gypsum, bonded gypsum, inlaid gypsum, thiab pobzeb nplaum. Plastering gypsum yog cov khoom siv zoo plastering rau sab hauv phab ntsa thiab qab nthab. Lub phab ntsa nto plastered nrog nws yog zoo thiab du. Ib hom tshiab ntawm lub tsev lub teeb board nplaum yog cov khoom nplaum ua los ntawm gypsum ua cov khoom siv hauv paus thiab ntxiv ntau yam khoom ntxiv. Nws yog tsim rau kev sib txuas ntawm ntau yam khoom siv hauv tsev inorganic. Nws yog non-toxic, tasteless, thiab ceev ceev. Nws yog cov khoom txhawb nqa rau lub tsev boards thiab thaiv kev tsim kho; gypsum caulking tus neeg saib xyuas yog qhov sib txawv ntawm qhov sib txawv ntawm cov gypsum boards thiab kho qhov muab tub lim rau phab ntsa thiab cov kab nrib pleb.

Cov khoom gypsum no muaj ntau txoj haujlwm sib txawv. Ntxiv nrog rau lub luag haujlwm ntawm gypsum thiab lwm yam khoom ntim, qhov teeb meem tseem ceeb yog qhov ntxiv cellulose ether additives ua lub luag haujlwm tseem ceeb. Txij li thaum gypsum muab faib ua anhydrous gypsum thiab hemihydrate gypsum, qhov sib txawv gypsum muaj qhov sib txawv ntawm qhov kev ua tau zoo ntawm cov khoom, yog li thickening, dej tuav thiab retardation txiav txim siab qhov zoo ntawm gypsum tsev cov ntaub ntawv. Qhov teeb meem tshwm sim ntawm cov ntaub ntawv no yog hollowing thiab cracking, thiab thawj lub zog tsis tuaj yeem ncav cuag. Yuav kom daws tau qhov teeb meem no, nws yog xaiv hom cellulose thiab cov khoom siv sib xyaw ua ke ntawm cov retarder. Hauv qhov no, methyl lossis hydroxypropyl methyl 30000 feem ntau xaiv. -60000cps, tus nqi ntxiv yog 1.5%-2%. Ntawm lawv, cellulose tsom rua dej tuav thiab retarding lubrication. Txawm li cas los xij, nws tsis tuaj yeem cia siab rau cellulose ether ua ib qho retarder, thiab nws yog ib qho tsim nyog yuav tsum tau ntxiv citric acid retarder los sib tov thiab siv yam tsis muaj kev cuam tshuam rau thawj lub zog.

Kev tuav dej feem ntau yog hais txog qhov dej ntau npaum li cas yuav ploj mus yam tsis muaj dej nqus dej sab nraud. Yog tias cov phab ntsa qhuav dhau lawm, kev nqus dej thiab cov evaporation ntawm lub hauv paus yuav ua rau cov khoom poob dej sai heev, thiab hollowing thiab cracking yuav tshwm sim. Txoj kev siv no yog tov nrog cov hmoov qhuav. Yog tias koj npaj ib qho kev daws teeb meem, thov xa mus rau txoj kev npaj ntawm cov tshuaj.

(4) Thermal rwb thaiv tsev mortar

Rwb thaiv tsev mortar yog ib yam tshiab ntawm sab hauv phab ntsa rwb thaiv tsev cov ntaub ntawv nyob rau hauv sab qaum teb cheeb tsam. Nws yog cov khoom siv phab ntsa ua ke los ntawm cov khoom siv rwb thaiv tsev, tshuaj khib thiab cov ntawv khi. Hauv cov khoom no, cellulose plays lub luag haujlwm tseem ceeb hauv kev sib txuas thiab ua kom muaj zog. Feem ntau xaiv methyl cellulose nrog viscosity siab (kwv yees li 10000cps), qhov ntau npaum li cas ntawm 2‰-3‰), thiab txoj kev siv yog cov hmoov qhuav sib tov.

(5) Tus neeg saib xyuas interface

Xaiv HPNC 20000cps rau tus neeg saib xyuas interface, xaiv 60000cps lossis ntau dua rau cov nplais nplaum, thiab tsom mus rau cov thickener hauv tus neeg saib xyuas interface, uas tuaj yeem txhim kho lub zog tensile thiab tiv thaiv xub xub. Siv los ua cov dej tuav hauv kev sib txuas ntawm cov vuas kom tiv thaiv cov vuas los ntawm lub cev qhuav dej sai heev thiab poob tawm.


Lub sij hawm xa tuaj: Plaub Hlis-20-2023
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