Pob zeb tiag tiag nrog Cellulose Ether

Kev cuam tshuam ntawm tus nqi ntawm cellulose ether, txheeb ze molecular loj thiab kev hloov kho txoj kev ntawm cov dej-absorbing thiab whitening tshwm sim ntawm cov xim pob zeb tiag tiag yog tham, thiab cov cellulose ether nrog cov dej-whitening zoo tshaj plaws ntawm cov xim pob zeb tiag tiag raug tshuaj xyuas, thiab qhov kev ua tau zoo ntawm cov xim pob zeb tiag tiag raug tshuaj xyuas kuaj pom.

Lo lus tseem ceeb:cov xim pob zeb tiag tiag;dej whitening kuj;cellulose ether

0,Ua ntej

Cov kua roj vanish tiag tiag yog cov khoom siv hluavtaws emulsion xuab zeb phab ntsa architectural txheej ua los ntawm ntuj granite, crushed pob zeb thiab pob zeb hmoov raws li aggregate, hluavtaws resin emulsion raws li cov khoom siv hauv paus thiab ntxiv nrog ntau yam additives.Nws muaj kev ntxhib los mos thiab zoo nkauj nyhuv ntawm ntuj pob zeb.Nyob rau hauv lub sab nrauv kho kom zoo nkauj project ntawm high-sawv vaj tse, nws yog nyiam los ntawm feem ntau ntawm cov tswv thiab builders.Txawm li cas los xij, nyob rau hnub los nag, kev nqus dej thiab ntxuav hniav dawb tau dhau los ua qhov tsis zoo ntawm cov xim pob zeb tiag tiag.Txawm hais tias muaj qhov laj thawj loj rau cov emulsion, qhov sib ntxiv ntawm ntau cov tshuaj hydrophilic xws li cellulose ether ua rau kom cov dej nqus dej ntawm cov xim pob zeb tiag tiag.Nyob rau hauv txoj kev tshawb no, los ntawm txhais tes ntawm cellulose ether, lub cawv ntawm tus nqi ntawm cellulose ether, txheeb ze molecular hnyav thiab hloov hom ntawm cov dej-absorbing thiab whitening tshwm sim ntawm tiag tiag pob zeb xim yog soj ntsuam.

1. Cov txheej txheem ntawm kev nqus dej thiab ntxuav hniav dawb ntawm cov xim pob zeb tiag

Tom qab lub pob zeb tiag tiag cov xim txheej yog qhuav, nws yog feem ntau whitening thaum nws ntsib dej, tshwj xeeb tshaj yog nyob rau hauv thaum ntxov theem ntawm qhuav (12h).Nyob rau hauv cov huab cua los nag, cov txheej yuav ua mos thiab dawb tom qab ntxuav los ntawm nag ntev.Thawj qhov laj thawj yog tias emulsion absorbs dej, thiab qhov thib ob yog tshwm sim los ntawm hydrophilic tshuaj xws li cellulose ether.Cellulose ether muaj lub luag haujlwm ntawm thickening thiab tuav dej.Vim yog qhov entanglement ntawm macromolecules, qhov ntws ntawm cov tshuaj sib txawv ntawm cov kua Newtonian, tab sis qhia tau hais tias tus cwj pwm hloov nrog kev hloov ntawm lub zog shear, uas yog, nws muaj thixotropy siab.Txhim kho kev tsim kho ntawm cov xim pob zeb tiag tiag.Cellulose yog tsim los ntawm D-glucopyranosyl (anhydroglucose), thiab nws cov mis mos molecular yooj yim yog (C6H10O5)n.Cellulose ether yog tsim los ntawm cellulose cawv hydroxyl pawg thiab alkyl halide los yog lwm yam etherification tus neeg sawv cev nyob rau hauv alkaline tej yam kev mob.Hydroxyethyl cellulose ether qauv, qhov nruab nrab ntawm cov pab pawg hydroxyl hloov los ntawm reagents ib chav tsev anhydroglucose ntawm cellulose molecular saw yog hu ua degree ntawm kev hloov, 2, 3, thiab 6 hydroxyl pawg yog tag nrho cov hloov, thiab qhov siab tshaj plaws ntawm kev hloov pauv yog 3. Cov pab pawg hydroxyl dawb ntawm cov saw hlau molecular ntawm cellulose ether tuaj yeem cuam tshuam los tsim cov ntawv cog lus hydrogen, thiab tseem tuaj yeem cuam tshuam nrog dej los tsim hydrogen bonds.Kev nqus dej thiab dej khaws cia ntawm cellulose ether muaj qhov cuam tshuam ncaj qha rau kev nqus dej thiab ntxuav cov xim pob zeb tiag tiag.Kev nqus dej thiab dej tuav kev ua tau zoo ntawm cellulose ether nyob ntawm qhov kev hloov pauv ntawm cellulose, hloov pauv thiab qib ntawm polymerization ntawm cellulose ether nws tus kheej.

2. Kev sim ib feem

2.1 Kev sim ntsuas thiab cov cuab yeej siv

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2.2 Kev sim qauv

2.3 Kev sim txheej txheem

Ntxiv dej, defoamer, bactericide, antifreeze, film-forming aid, cellulose, pH regulator thiab emulsion rau disperser raws li cov mis disperse tusyees, ces ntxiv xim av xuab zeb thiab do zoo, thiab ces siv ib tug tsim nyog npaum li cas ntawm thickener Kho lub viscosity. , disperse tusyees, thiab tau cov xim pob zeb tiag tiag.

Ua lub rooj tsavxwm nrog cov xim pob zeb tiag tiag, thiab ua cov dej ntxuav hniav dawb tom qab kho rau 12 teev (immersion hauv dej rau 4 teev).

2.4 Kev ntsuas kev ua haujlwm

Raws li JG / T 24-2000 "Synthetic Resin Emulsion Sand Wall Paint", qhov kev sim ua tau ua tiav, tsom mus rau cov dej ntxuav hniav dawb ntawm cov xim sib txawv hydroxyethyl cellulose ether tiag tiag pob zeb xim, thiab lwm yam kev ntsuas yuav tsum ua kom tau raws li qhov yuav tsum tau ua.

3. Cov txiaj ntsig thiab kev sib tham

Raws li cov yam ntxwv ntawm kev ua haujlwm ntawm hydroxyethyl cellulose ether, qhov cuam tshuam ntawm cov nyiaj hydroxyethyl cellulose ether, txheeb ze molecular hnyav thiab kev hloov kho ntawm cov dej-whitening kuj ntawm cov xim pob zeb tiag tiag tau kawm emphatically.

3.1 Cov nyhuv ntawm kev noj tshuaj

Nrog rau qhov nce ntawm cov nyiaj ntawm hydroxyethyl cellulose ether, cov dej whitening kuj ntawm cov xim pob zeb tiag tiag maj mam deteriorates.Qhov ntau dua ntawm cov cellulose ether, ntau cov pab pawg dawb hydroxyl, cov dej ntau yuav tsim hydrogen bonds nrog nws, cov dej nqus tus nqi ntawm cov xim pob zeb tiag tiag yuav nce, thiab cov dej tsis kam yuav txo.Cov dej ntau dua nyob rau hauv cov xim pleev xim, qhov yooj yim dua nws yog whiten saum npoo, yog li cov dej whitening kuj tsis zoo.

3.2 Cov nyhuv ntawm cov txheeb ze molecular loj

Thaum tus nqi ntawm hydroxyethyl cellulose ethers nrog sib txawv cov txheeb ze molecular masses yog tib yam.Qhov loj dua qhov txheeb ze molecular loj, qhov phem dua cov dej dawb tsis kam ntawm cov xim pob zeb tiag tiag, uas qhia tau hais tias cov txheeb ze molecular hnyav ntawm hydroxyethyl cellulose ether muaj kev cuam tshuam rau cov dej ntxuav hniav dawb ntawm cov xim pob zeb tiag.Qhov no yog vim hais tias cov tshuaj bonds > hydrogen bonds > van der Waals quab yuam, qhov ntau dua cov txheeb ze molecular loj ntawm cellulose ether, uas yog, ntau dua cov degree ntawm polymerization, ntau cov tshuaj bonds tsim los ntawm kev sib xyaw ntawm qabzib units, thiab ntau dua. Kev sib cuam tshuam quab yuam ntawm tag nrho cov kab ke tom qab tsim hydrogen bonds nrog dej, qhov muaj zog ntawm cov dej nqus thiab cov dej tuav tau, qhov phem dua cov dej ntxuav hniav dawb ntawm cov xim pob zeb tiag tiag.

3.3 Kev cuam tshuam ntawm kev hloov kho txoj kev

Cov txiaj ntsig kev sim qhia tau tias qhov kev hloov kho nonionic hydrophobic zoo dua li qhov qub, thiab kev hloov kho anionic yog qhov phem tshaj.Non-ionic hydrophobically hloov cellulose ether, los ntawm grafting hydrophobic pawg ntawm cov saw molecular ntawm cellulose ether.Nyob rau tib lub sijhawm, lub thickening ntawm cov dej theem yog tiav los ntawm hydrogen bonding ntawm dej thiab molecular saw entanglement.Qhov kev ua tau zoo hydrophobic ntawm lub kaw lus raug txo, kom cov hydrophobic kev ua tau zoo ntawm cov xim pob zeb tiag tiag tau txhim kho, thiab cov dej ua kom zoo dua qub.Anionically hloov cellulose ether yog hloov kho los ntawm cellulose thiab polyhydroxysilicate, uas txhim kho cov thickening efficiency, anti-sag kev ua tau zoo thiab anti-splash kev ua tau zoo ntawm cellulose ether, tab sis nws ionicity yog muaj zog, thiab cov dej nqus thiab khaws cia muaj peev xwm yog zoo dua, cov dej whitening kuj. ntawm cov xim pob zeb tiag tiag yuav phem dua.

4. Cov lus xaus

Kev nqus dej thiab ua kom dawb ntawm cov xim pob zeb tiag tiag cuam tshuam los ntawm ntau yam xws li tus nqi ntawm cellulose ether thiab kev hloov kho ntawm cov txheeb ze molecular loj.Kev nqus dej thiab ntxuav hniav dawb ntawm cov xim pob zeb tiag.