Cellulose ether yog ib hom polymer uas tsis yog ionic semi-synthetic siab molecular. Nws muaj ob hom dej-soluble thiab solvent-based. Nws muaj cov teebmeem sib txawv hauv ntau yam lag luam. Piv txwv li, hauv cov ntaub ntawv siv tshuaj lom neeg, nws muaj cov teebmeem sib xyaw ua ke hauv qab no: ① Tus neeg sawv cev khaws dej ② Thickener ③ Leveling ④ Zaj duab xis-tsim ⑤ Binder; hauv kev lag luam PVC, nws yog emulsifier thiab dispersant; hauv kev lag luam tshuaj, nws yog tus binder thiab Vim tias cellulose muaj ntau yam teebmeem sib xyaw, nws kuj yog qhov siv dav tshaj plaws. Hauv qab no kuv yuav tsom mus rau kev siv thiab kev ua haujlwm ntawm cellulose ethers hauv cov ntaub ntawv siv hauv tsev uas zoo rau ib puag ncig.
1. Hauv cov xim latex
Hauv kev lag luam pleev xim latex, yuav tsum xaiv hydroxyethyl cellulose. Cov lus qhia dav dav ntawm viscosity yog RT30000-50000cps, thiab qhov ntau npaum li cas feem ntau yog li 1.5‰-2‰. Lub luag haujlwm tseem ceeb ntawm hydroxyethyl hauv cov xim latex yog kom tuab, tiv thaiv cov xim gelation, pab cov xim dispersion, latex, thiab ruaj khov, thiab tuaj yeem txhim kho viscosity ntawm cov khoom thiab pab txhawb rau kev ua haujlwm ntawm kev tsim kho: Hydroxyethyl Ethyl cellulose yooj yim dua rau siv. Nws tuaj yeem yaj hauv dej txias thiab dej kub, thiab nws tsis cuam tshuam los ntawm tus nqi pH. Nws tuaj yeem siv ntawm tus nqi pH ntawm 2 thiab 12. Muaj peb txoj hauv kev hauv qab no:
I. Ntxiv ncaj qha rau hauv kev tsim khoom:
Txoj kev no yuav tsum xaiv hom hydroxyethyl cellulose qeeb - hydroxyethyl cellulose nrog lub sijhawm yaj ntau dua 30 feeb. Cov kauj ruam siv yog raws li nram no: ① Ntxiv ib qho dej ntshiab rau hauv lub thawv nrog lub tshuab ua kom siab ② Pib do tas li ntawm qhov ceev qis, thiab tib lub sijhawm maj mam thiab sib npaug ntxiv pawg hydroxyethyl rau hauv cov tshuaj ③ Txuas ntxiv do kom txog thaum tag nrho cov khoom siv granular raug ntub los ntawm ④ Ntxiv lwm yam khoom ntxiv thiab cov khoom ntxiv alkaline, thiab lwm yam. ⑤ Do kom txog thaum tag nrho cov pawg hydroxyethyl yaj tag, Ntxiv cov khoom xyaw seem hauv daim ntawv qhia thiab zom kom txog thaum tiav.
Ⅱ. Muaj cov cawv niam:
Txoj kev no tuaj yeem xaiv hom tam sim ntawd, thiab muaj cov nyhuv ntawm cov cellulose tiv thaiv pwm. Qhov zoo ntawm txoj kev no yog tias nws muaj kev ywj pheej ntau dua thiab tuaj yeem ntxiv ncaj qha rau cov xim latex. Txoj kev npaj yog tib yam li cov kauj ruam ntawm ①-④.
III. Rau kev npaj cov khoom zoo li porridge:
Vim tias cov kuab tshuaj organic yog cov kuab tshuaj tsis zoo (insoluble) rau cov pab pawg hydroxyethyl, porridges tuaj yeem tsim nrog cov kuab tshuaj no. Cov kuab tshuaj organic feem ntau siv yog cov kua organic hauv cov xim latex, xws li ethylene glycol, propylene glycol thiab cov yeeb yaj kiab formers (xws li diethylene glycol butyl acetate). Cov porridge hydroxyethyl cellulose tuaj yeem ntxiv ncaj qha rau hauv cov xim. Txuas ntxiv do kom txog thaum yaj tag.
2, scraping phab ntsa putty
Tam sim no, cov khoom siv putty uas tsis muaj dej thiab tsis yooj yim txhuam hauv feem ntau lub nroog hauv kuv lub teb chaws tau txais txiaj ntsig zoo los ntawm cov neeg. Nyob rau ob peb xyoos dhau los, vim tias cov putty ua los ntawm cov kua nplaum tsim kho tso tawm cov pa roj formaldehyde thiab ua rau tib neeg txoj kev noj qab haus huv puas tsuaj, cov kua nplaum tsim kho yog ua los ntawm polymer Nws yog npaj los ntawm cov tshuaj acetal ntawm vinyl cawv thiab formaldehyde. Yog li ntawd, cov khoom no maj mam raug tshem tawm los ntawm cov neeg, thiab cov khoom cellulose ether series raug hloov los ntawm cov khoom no, uas yog hais tias, kev tsim cov khoom siv tsev uas tsis muaj dej thiab tsis yooj yim txhuam, cellulose yog tib yam khoom siv tam sim no.
Hauv cov putty uas tsis muaj dej, nws muab faib ua cov hmoov qhuav putty thiab putty paste. Ntawm ob hom putty no, feem ntau xaiv cov methyl cellulose hloov kho thiab hydroxypropyl methyl. Qhov viscosity specification feem ntau yog ntawm 30000-60000cps. Lub luag haujlwm tseem ceeb ntawm cellulose hauv putty yog kev khaws cia dej, kev sib txuas thiab kev ua kom lubrication.
Vim tias cov qauv putty ntawm ntau lub tuam txhab tsim khoom sib txawv, qee qhov yog grey calcium, lub teeb calcium, dawb cement, thiab lwm yam, thiab qee qhov yog gypsum hmoov, grey calcium, lub teeb calcium, thiab lwm yam, yog li ob daim qauv xaiv cov cellulose specifications, viscosity thiab penetration. Tus nqi ntxiv yog li 2‰-3‰.
Thaum tsim cov putty rau phab ntsa uas khawb tau, vim tias qhov chaw hauv paus ntawm phab ntsa muaj qee yam dej nqus (qhov dej nqus ntawm phab ntsa cib yog 13%, thiab qhov dej nqus ntawm cov pob zeb yog 3-5%), ua ke nrog kev ua pa ntawm lub ntiaj teb sab nraud, yog tias cov putty poob dej sai dhau, nws yuav ua rau muaj kev tawg lossis tshem tawm hmoov thiab lwm yam xwm txheej, yog li ua rau lub zog ntawm cov putty tsis muaj zog. Vim li no, ntxiv cellulose ether yuav daws qhov teeb meem no. Tab sis qhov zoo ntawm cov khoom sau, tshwj xeeb tshaj yog qhov zoo ntawm cov kua qaub calcium, kuj tseem ceeb heev. Vim tias cellulose muaj viscosity siab, nws kuj ua rau lub buoyancy ntawm cov putty, zam kev sagging thaum lub sijhawm tsim kho, thiab xis nyob dua thiab txuag zog tom qab khawb.
3. Cov pob zeb ua vaj tse
Hauv cov pob zeb ua vaj tse, kom ua tiav qhov kawg lub zog, cov cement yuav tsum tau hydrated tag nrho, tshwj xeeb tshaj yog nyob rau hauv lub caij ntuj sov kev tsim kho, cov pob zeb ua vaj tse poob dej sai dhau, thiab kev ntsuas ntawm kev hydration tag nrho yog coj los tswj thiab sprinkle dej. Kev pov tseg ntawm cov peev txheej thiab kev ua haujlwm tsis yooj yim, qhov tseem ceeb yog tias dej tsuas yog nyob rau ntawm qhov chaw, thiab sab hauv hydration tseem tsis tiav, yog li qhov kev daws teeb meem rau qhov teeb meem no yog ntxiv hydroxypropyl methyl cellulose lossis methyl cellulose rau hauv cov pob zeb ua vaj tse. Qhov kev qhia viscosity yog ntawm 20000–60000cps, qhov ntxiv yog li 2‰–3‰, thiab tus nqi khaws dej tuaj yeem nce mus rau ntau dua 85%. Txoj kev siv hauv cov pob zeb ua vaj tse yog sib tov cov hmoov qhuav sib npaug thiab tom qab ntawd ntxiv dej.
4. Hauv kev siv plastering, bonding plaster thiab caulking plaster
Nrog rau kev txhim kho sai ntawm kev lag luam kev tsim kho, tib neeg qhov kev xav tau cov ntaub ntawv tsim kho tshiab kuj nce ntxiv txhua hnub. Vim yog kev nce ntxiv ntawm tib neeg txoj kev paub txog kev tiv thaiv ib puag ncig thiab kev txhim kho tas li ntawm kev ua haujlwm ntawm kev tsim kho, cov khoom siv cementitious gypsum tau tsim kho sai. Tam sim no, cov khoom siv gypsum feem ntau yog plastering gypsum, bonding gypsum, inlaying gypsum, vuas nplaum thiab lwm yam.
Cov stucco plaster yog ib hom khoom siv plastering zoo rau phab ntsa sab hauv thiab ru tsev. Cov phab ntsa uas plastered nrog nws yog mos thiab du, tsis poob hmoov, lo rau lub substrate, tsis tawg thiab poob tawm, thiab muaj hluav taws kub; bonding plaster yog ib hom plaster. Ib hom tshiab ntawm lub tsev teeb board nplaum yog ib yam khoom nplaum ua los ntawm gypsum ua cov khoom siv hauv paus thiab ntxiv ntau yam khoom ntxiv. Nws yog qhov tsim nyog rau kev sib txuas ntawm ntau yam khoom siv inorganic phab ntsa tsev. Nws tsis muaj tshuaj lom, tsis muaj saj, Nws muaj cov yam ntxwv ntawm lub zog thaum ntxov, teeb tsa sai thiab sib txuas zoo, thiab yog cov khoom txhawb nqa rau kev tsim kho ntawm cov laug cam thiab cov blocks;
Cov khoom gypsum no muaj ntau yam haujlwm sib txawv, ntxiv rau lub luag haujlwm ntawm gypsum thiab cov khoom siv ntxiv, qhov teeb meem tseem ceeb yog tias cov cellulose ether ntxiv ua lub luag haujlwm tseem ceeb. Txij li thaum gypsum raug faib ua anhydrite thiab hemihydrate gypsum, gypsum sib txawv muaj cov teebmeem sib txawv rau kev ua haujlwm ntawm cov khoom, yog li thickening, dej khaws cia thiab retardation txiav txim siab qhov zoo ntawm cov khoom siv gypsum tsev. Qhov teeb meem feem ntau ntawm cov ntaub ntawv no yog hollow cracking, thiab lub zog pib tsis tuaj yeem ncav cuag. Txhawm rau daws qhov teeb meem no, nws yog qhov teeb meem ntawm kev xaiv hom cellulose thiab txoj kev siv sib xyaw ntawm cov retarder. Hauv qhov no, methyl lossis hydroxypropyl methyl 30000 feem ntau raug xaiv. -60000cps, qhov ntxiv yog ntawm 1.5‰ -2‰, qhov tseem ceeb ntawm cellulose yog dej khaws cia, retardation thiab lubrication.
Txawm li cas los xij, nws tsis tuaj yeem cia siab rau cellulose ether ua tus retarder, thiab nws yog qhov tsim nyog los ntxiv cov citric acid retarder los sib tov thiab siv nws kom lub zog pib yuav tsis raug cuam tshuam.
Feem ntau, qhov ceev ntawm kev khaws dej yog hais txog qhov dej poob ntuj tsim thaum tsis muaj dej nqus los ntawm sab nraud. Yog tias phab ntsa qhuav heev, kev nqus dej thiab kev ua pa ntawm lub hauv paus yuav ua rau cov khoom poob dej sai dhau, thiab yuav muaj qhov khoob thiab tawg.
Txoj kev siv no yog sib xyaw nrog hmoov qhuav. Yog tias muaj kev npaj cov tshuaj, thov saib txoj kev npaj cov tshuaj.
5. Cov tshuaj nplaum rwb thaiv tsev
Cov tshuaj nplaum rwb thaiv tsev yog ib hom khoom siv rwb thaiv tsev tshiab hauv thaj tsam sab qaum teb. Nws yog cov khoom siv phab ntsa uas muaj cov khoom siv rwb thaiv tsev, tshuaj nplaum thiab cov khoom sib txuas. Hauv cov khoom siv no, cellulose ua 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 10000eps), qhov ntau npaum li cas feem ntau yog ntawm 2‰-3‰), thiab txoj kev siv yog txoj kev sib tov hmoov qhuav.
6. Tus neeg sawv cev sib txuas lus
Tus neeg sawv cev sib txuas yog HPNC20000cps, thiab cov nplaum pobzeb yog ntau dua 60000cps. Hauv tus neeg sawv cev sib txuas, nws feem ntau yog siv ua cov khoom tuab, uas tuaj yeem txhim kho lub zog tensile thiab kev tiv thaiv xub.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-02-2022