Cellulose etheryog ib qho polymer uas tsis yog ionic semi-synthetic, uas yaj tau hauv dej thiab yaj tau hauv cov kuab tshuaj. Nws muaj cov teebmeem sib txawv hauv ntau yam lag luam. Piv txwv li, hauv cov ntaub ntawv siv hauv tsev, nws muaj cov teebmeem sib xyaw ua ke hauv qab no:
①Tus neeg sawv cev khaws dej ②Thickener ③Cov khoom sib npaug ④Cov khoom tsim zaj duab xis ⑤Cov khoom khi
Hauv kev lag luam polyvinyl chloride, nws yog ib qho emulsifier thiab dispersant; hauv kev lag luam tshuaj, nws yog ib qho binder thiab qeeb thiab tswj cov khoom siv tso tawm, thiab lwm yam. Vim tias cellulose muaj ntau yam kev sib xyaw ua ke, nws daim ntawv thov Lub teb kuj yog qhov dav tshaj plaws. Cov hauv qab no tsom mus rau kev siv thiab kev ua haujlwm ntawm cellulose ether hauv ntau yam khoom siv hauv tsev.
(1) Hauv cov xim latex:
I. Ntxiv ncaj qha rau hauv kev tsim khoom: txoj kev no yuav tsum xaiv hom hydroxyethyl cellulose qeeb, thiab hydroxyethyl cellulose nrog lub sijhawm yaj ntau dua 30 feeb, nws cov kauj ruam siv yog raws li nram no:
① Muab ib qho dej ntshiab rau hauv lub thawv uas muaj lub tshuab sib tov siab
② Pib do tas li ntawm qhov ceev qis, thiab tib lub sijhawm maj mam ntxiv hydroxyethyl rau hauv cov tshuaj kom sib npaug
③Txuas ntxiv mus kom txog thaum tag nrho cov granules raug ntub dej
④Ntxiv lwm yam khoom ntxiv thiab cov khoom ntxiv yooj yim, thiab lwm yam.
⑤Txhob kom txog thaum tag nrho cov hydroxyethyl pawg yaj tag, tom qab ntawd ntxiv lwm cov khoom hauv cov mis, thiab zom kom txog thaum cov khoom tiav.
Ⅱ. Nruab nrog cov cawv niam rau kev siv tom qab: Txoj kev no tuaj yeem xaiv cov cellulose tam sim ntawd, uas muaj cov nyhuv tiv thaiv kab mob 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 ①-④.
Ⅲ. Npaj cov porridge rau siv tom qab: Vim tias cov organic solvents yog cov organic solvents tsis zoo (insoluble) rau hydroxyethyl, cov solvents no tuaj yeem siv los npaj porridge. Cov organic solvents feem ntau siv yog cov kua organic hauv cov xim latex, xws li ethylene glycol, propylene glycol, thiab cov neeg sawv cev tsim zaj duab xis (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) Hauv phab ntsa scraping putty:
Tam sim no, feem ntau ntawm cov nroog hauv kuv lub tebchaws, cov putty uas tsis muaj dej thiab tsis yooj yim txhuam tau txais txiaj ntsig zoo los ntawm tib neeg. Nws yog tsim los ntawm acetal reaction ntawm vinyl cawv thiab formaldehyde. Yog li ntawd, cov khoom no maj mam raug tshem tawm los ntawm tib neeg, thiab cov khoom cellulose ether series siv los hloov cov khoom no. Uas yog hais tias, rau kev tsim cov khoom siv hauv tsev uas tsis muaj dej, cellulose tam sim no yog tib yam khoom siv.
Vim yog qhov viscosity siab ntawm cellulose, qhov buoyancy ntawm putty kuj tau txhim kho, thiab qhov tshwm sim sagging thaum lub sijhawm tsim kho kuj raug zam, thiab nws yooj yim dua thiab txuag zog tom qab khawb. Nws yooj yim dua los ntxiv cellulose ether rau hauv cov hmoov putty. Nws cov khoom tsim thiab siv tau yooj yim dua. Cov khoom sau thiab cov khoom ntxiv tuaj yeem sib xyaw ua ke hauv cov hmoov qhuav.
(3) Cov pob zeb ua vaj tse:
Hauv cov pob zeb ua vaj tse, kom ua tiav qhov muaj zog tshaj plaws, 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 cov kev ntsuas ntawm kev hydration tag nrho yog siv los tswj thiab sprinkle dej. Pov tseg cov peev txheej thiab kev ua haujlwm tsis yooj yim. Qhov tseem ceeb yog tias cov dej tsuas yog nyob rau ntawm qhov chaw, thiab sab hauv hydration tseem tsis tiav. Yog li ntawd, qhov kev daws teeb meem rau qhov teeb meem no yog ntxiv yim tus neeg sawv cev dej-tuav rau hauv cov pob zeb ua vaj tse. Feem ntau, hydroxypropyl methyl lossis methyl Cellulose, qhov viscosity specification yog ntawm 20000-60000cps, thiab qhov ntxiv yog 2% -3%. Tus nqi khaws dej tuaj yeem nce mus txog ntau dua 85%. Txoj kev siv hauv cov pob zeb ua vaj tse yog sib tov cov hmoov qhuav sib npaug thiab nchuav nws rau hauv dej.
(4) Hauv kev siv plastering gypsum, bonded gypsum, caulking gypsum:
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 mus 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, bonded gypsum, inlaid gypsum, thiab vuas nplaum. Plastering gypsum yog cov khoom siv plastering zoo rau sab hauv phab ntsa thiab qab nthab. Qhov chaw ntawm phab ntsa uas plastered nrog nws yog qhov zoo thiab du. Lub tsev teeb pom kev zoo board nplaum tshiab yog cov khoom nplaum ua los ntawm gypsum ua cov khoom siv hauv paus thiab ntau yam ntxiv. Nws yog qhov tsim nyog rau kev sib txuas ntawm ntau yam khoom siv phab ntsa inorganic. Nws tsis muaj tshuaj lom, tsis muaj ntxhiab, lub zog thaum ntxov thiab teeb tsa sai, kev sib txuas muaj zog thiab lwm yam ntxwv, nws yog cov khoom txhawb nqa rau cov laug cam tsev thiab thaiv kev tsim kho; gypsum caulking tus neeg sawv cev yog qhov sib txawv ntawm gypsum boards thiab kho cov khoom siv rau phab ntsa thiab kab nrib pleb.
Cov khoom gypsum no muaj ntau yam haujlwm sib txawv. Ntxiv rau lub luag haujlwm ntawm gypsum thiab cov khoom siv sib txuas, qhov teeb meem tseem ceeb yog tias cov cellulose ether ntxiv ua lub luag haujlwm tseem ceeb. Txij li thaum gypsum raug faib ua anhydrous gypsum 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 hollowing thiab tawg, thiab lub zog pib tsis tuaj yeem ncav cuag. Txhawm rau daws qhov teeb meem no, nws yog xaiv hom cellulose thiab txoj kev siv cov tshuaj sib xyaw ntawm retarder. Hauv qhov no, methyl lossis hydroxypropyl methyl 30000 feem ntau raug xaiv. -60000cps, qhov ntxiv yog ntawm 1.5% thiab 2%, thiab qhov tsom mus rau cellulose yog dej khaws cia thiab retarding lubrication. Txawm li cas los xij, nws tsis yooj yim sua kom cia siab rau cellulose ether ua retarder, thiab nws yog qhov tsim nyog los ntxiv citric acid retarder kom sib tov thiab siv yam tsis cuam tshuam rau lub zog pib.
Feem ntau, kev khaws dej yog hais txog seb yuav muaj dej ntau npaum li cas uas yuav ploj mus yam tsis muaj dej los ntawm sab nraud. Yog tias phab ntsa qhuav dhau, 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 koj npaj cov tshuaj, thov saib txoj kev npaj cov tshuaj.
(5) Cov tshuaj nplaum rwb thaiv tsev thermal
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 ua los ntawm cov khoom siv rwb thaiv tsev, tshuaj nplaum thiab cov khoom siv khi. 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 sib tov hmoov qhuav.
(6) Tus neeg sawv cev sib txuas lus
XaivHPMC20000cps rau tus neeg sawv cev sib txuas, xaiv 60000cps lossis ntau dua rau cov nplaum pobzeb, thiab tsom mus rau tus neeg sawv cev tuab hauv tus neeg sawv cev sib txuas, uas tuaj yeem txhim kho lub zog tensile thiab lub zog tiv thaiv xub. Siv ua tus neeg sawv cev khaws dej hauv kev sib txuas ntawm cov pobzeb kom tiv thaiv cov pobzeb kom tsis txhob qhuav sai thiab poob tawm.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024