Focus on Cellulose ethers

Kev siv Sodium Carboxymethyl Cellulose (CMC) hauv Ceramics

Sodium carboxymethyl cellulose, lus Askiv abbreviation CMC, feem ntau hu ua "methyl" nyob rau hauv cov ceramic kev lag luam, yog ib tug anionic tshuaj, ib tug dawb los yog me ntsis daj hmoov ua los ntawm ntuj cellulose raws li raw khoom thiab tshuaj hloov kho. . CMC muaj solubility zoo thiab tuaj yeem yaj mus rau hauv cov pob tshab thiab cov kua dej tsis sib xws hauv cov dej txias thiab dej kub.

1. Cov lus qhia luv luv rau kev siv CMC hauv ceramics

1.1. Kev siv CMC hauv ceramics

1.1.1, kev siv lub hauv paus ntsiab lus

CMC muaj cov qauv linear polymer tshwj xeeb. Thaum CMC ntxiv rau hauv dej, nws pawg hydrophilic (-COONa) ua ke nrog dej los tsim cov txheej txheem kev daws teeb meem, kom CMC molecules maj mam tawg hauv dej. CMC polymers cia siab rau hydrogen bonds thiab van der Waals rog. Cov nyhuv tsim ib lub network qauv, yog li qhia kev cohesion. Lub cev tshwj xeeb CMC tuaj yeem siv los ua cov khoom siv ntxiv, cov yas yas, thiab cov neeg sawv cev ntxiv rau lub cev ntsuab hauv kev lag luam ceramic. Ntxiv qhov tsim nyog ntawm CMC rau lub billet tuaj yeem ua rau kom muaj zog ntawm lub pob zeb, ua kom lub pob zeb yooj yim rau daim ntawv, ua kom lub zog flexural los ntawm 2 mus rau 3 zaug, thiab txhim kho kev ruaj ntseg ntawm billet, yog li ua kom cov khoom zoo. tus nqi ntawm ceramics thiab txo cov nqi tom qab ua tiav. . Nyob rau tib lub sijhawm, vim yog qhov sib ntxiv ntawm CMC, nws tuaj yeem ua rau lub cev ntsuab ua kom nrawm thiab txo qis kev siv zog ntau lawm. Nws tseem tuaj yeem ua kom cov dej noo hauv cov pob zeb evaporate tusyees thiab tiv thaiv kom qhuav thiab tawg. Tshwj xeeb tshaj yog thaum nws yog siv rau loj-loj pem teb pobzeb billets thiab polished cib billets, cov nyhuv yog txawm zoo dua. pom tseeb. Piv nrog rau lwm cov tshuaj tiv thaiv lub cev ntsuab, ntsuab lub cev tshwj xeeb CMC muaj cov yam ntxwv hauv qab no:

(1) Cov nyiaj ntxiv me me: qhov sib ntxiv yog feem ntau tsawg dua 0.1%, uas yog 1/5 mus rau 1/3 ntawm lwm cov khoom siv lub cev, thiab lub zog flexural ntawm lub cev ntsuab tau txhim kho zoo, thiab tus nqi tuaj yeem txo. tib lub sijhawm.

(2) Cov khoom siv hluav taws xob zoo: yuav luag tsis muaj cov tshauv tawm tom qab hlawv, thiab tsis muaj qhov seem, uas tsis cuam tshuam rau cov xim ntawm qhov khoob.

(3) Cov cuab yeej tshem tawm zoo: tiv thaiv cov ntaub ntawv tsis zoo thiab cov xim pleev xim los ntawm kev daws teeb meem, thiab ua kom cov khoom sib cais sib npaug.

(4) Anti-abrasion: Nyob rau hauv cov txheej txheem ntawm pob milling, cov saw molecular yog tsawg puas.

1.1.2, ntxiv txoj kev

Tus nqi ntxiv ntawm CMC hauv daim ntawv yog 0.03-0.3%, uas tuaj yeem hloov kho kom haum raws li qhov xav tau tiag tiag. Rau cov av nkos uas muaj ntau cov ntaub ntawv tsis zoo hauv cov mis, CMC tuaj yeem muab ntxiv rau lub pob zeb kom zom ua ke nrog cov av nkos, ua tib zoo saib xyuas cov khoom sib txawv, kom tsis txhob nyuaj rau yaj tom qab agglomeration, los yog ua ntej. yaj CMC thiab dej ntawm qhov sib piv ntawm 1:30 Ntxiv rau lub pob zeb thiab sib tov sib npaug 1-5 teev ua ntej milling.

1.2. Kev siv CMC hauv glaze slurry

1.2.1. Txoj cai thov

CMC rau glaze slurry yog stabilizer thiab binder nrog kev ua tau zoo heev. Nws yog siv rau hauv qab glaze thiab sab saum toj glaze ntawm ceramic vuas, uas tuaj yeem ua rau kom muaj zog sib txuas ntawm glaze slurry thiab lub cev. Vim hais tias cov glaze slurry yog ib qho yooj yim rau precipitate thiab tsis zoo stability, CMC thiab ntau yam compatibility ntawm no hom glaze yog zoo, thiab nws muaj zoo heev dispersion thiab tiv thaiv colloid, yog li ntawd lub glaze nyob rau hauv ib tug heev ruaj khov dispersion xeev. Tom qab ntxiv CMC, qhov nro ntawm qhov glaze tuaj yeem nce ntxiv, dej tuaj yeem tiv thaiv kom tsis txhob muaj qhov sib txawv ntawm cov glaze mus rau lub cev ntsuab, qhov smoothness ntawm glaze nto tuaj yeem nce ntxiv, thiab tawg thiab tawg thaum lub sij hawm thauj mus los los ntawm cov txo lub zog ntawm lub cev ntsuab tom qab glazing yuav zam tau. , lub pinhole phenomenon ntawm glaze nto kuj yuav txo tau tom qab tua.

1.2.2. Ntxiv txoj kev

Tus nqi ntawm CMC ntxiv rau hauv qab glaze thiab sab saum toj glaze feem ntau yog 0.08-0.30%, thiab nws tuaj yeem hloov kho raws li qhov xav tau tiag tiag thaum siv. Ua ntej ua CMC rau hauv 3% aqueous tov. Yog hais tias nws yuav tsum tau muab khaws cia rau ob peb hnub, cov tshuaj no yuav tsum tau ntxiv nrog ib tug tsim nyog tus nqi ntawm preservatives thiab muab tso rau hauv ib lub thawv ntim, khaws cia ntawm qhov kub thiab txias, thiab ces tov nrog glaze tusyees.

1.3. Kev siv CMC hauv kev luam ntawv glaze

1.3.1. Qhov tshwj xeeb CMC rau luam ntawv glaze muaj cov thickening zoo, dispersibility thiab stability. Qhov tshwj xeeb CMC no siv cov thev naus laus zis tshiab, muaj qhov zoo solubility, siab transparency, yuav luag tsis muaj teeb meem insoluble, thiab muaj cov khoom zoo heev shear thinning thiab lubrication, zoo heev txhim kho cov luam ntawv adaptability ntawm printing glaze, txo qhov tshwm sim ntawm sticking thiab thaiv qhov screen, txo tus naj npawb. ntawm cov ntaub so, du luam ntawv thaum lub sijhawm ua haujlwm, cov qauv ntshiab, thiab cov xim zoo sib xws.

1.3.2. Tus nqi ntxiv ntawm kev ntxiv luam ntawv glaze yog 1.5-3%. CMC tuaj yeem nkag mus nrog ethylene glycol thiab tom qab ntawd ntxiv dej kom nws ua ntej yaj. Nws tseem tuaj yeem ntxiv nrog 1-5% sodium tripolyphosphate thiab cov ntaub ntawv xim ua ke. Qhuav sib tov, thiab tom qab ntawd yaj nrog dej, kom txhua yam ntaub ntawv tuaj yeem yaj tag nrho sib npaug.

1.4. Kev siv CMC hauv oozing glaze

1.4.1. Txoj cai thov

Ntshav glaze muaj ntau cov ntsev soluble, thiab qee qhov ntawm lawv yog me ntsis acidic. Hom tshwj xeeb ntawm CMC rau ntshav glaze muaj cov kua qaub thiab ntsev ua kom ruaj khov, uas tuaj yeem ua kom cov viscosity ntawm cov ntshav glaze ruaj khov thaum siv thiab tso, thiab tiv thaiv nws los ntawm kev puas tsuaj vim kev hloov hauv viscosity. Nws cuam tshuam cov xim sib txawv, thiab cov dej solubility, mesh permeability thiab dej tuav ntawm CMC tshwj xeeb rau cov ntshav glaze yog qhov zoo heev, uas yog ib qho kev pab zoo los tswj kev ruaj ntseg ntawm cov ntshav glaze.

1.4.2. Ntxiv txoj kev

Dissolve CMC nrog ethylene glycol, ib feem ntawm dej thiab complexing tus neeg sawv cev ua ntej, thiab ces sib tov nrog cov tshuaj yaj yeeb yaj duab.

2. Cov teeb meem uas yuav tsum tau them nyiaj rau hauv kev tsim cov CMC hauv ceramics

2.1. Ntau hom CMC muaj cov haujlwm sib txawv hauv kev tsim cov ceramics. Kev xaiv kom raug tuaj yeem ua tiav lub hom phiaj ntawm kev lag luam thiab kev ua haujlwm siab.

2.2. Nyob rau hauv nto glaze thiab luam ntawv glaze, koj yuav tsum tsis txhob siv low-purity CMC khoom pheej yig, tshwj xeeb tshaj yog nyob rau hauv printing glaze, koj yuav tsum xaiv high-purity CMC nrog siab purity, zoo acid thiab ntsev, thiab siab transparency los tiv thaiv glaze Ripples thiab pinholes. tshwm rau ntawm qhov chaw. Nyob rau tib lub sijhawm, nws tseem tuaj yeem tiv thaiv qhov tshwm sim ntawm plugging net, tsis zoo leveling thiab xim txawv thaum siv.

2.3. Yog hais tias qhov kub thiab txias los yog glaze slurry yuav tsum tau muab tso rau lub sij hawm ntev, preservatives yuav tsum tau ntxiv.

3. Kev tshuaj xyuas ntawm cov teeb meem uas tshwm sim ntawmCMC hauv ceramicntau lawm

3.1. Lub fluidity ntawm cov av nkos tsis zoo, thiab nws nyuaj rau tso cov kua nplaum.

Vim nws tus kheej viscosity, CMC yuav ua rau cov av nkos viscosity siab dhau, ua rau nws nyuaj rau tso cov av nkos. Txoj kev daws teeb meem yog kho tus nqi thiab hom coagulant. Cov mis decoagulant hauv qab no tau pom zoo: (1) sodium tripolyphosphate 0.3%; (2) sodium tripolyphosphate 0.1% + dej iav 0.3%; (3) humic acid Sodium 0.2% + sodium tripolyphosphate 0.1%

3.2. Lub glaze slurry thiab luam ntawv number case yog nyias.

Yog vim li cas vim li cas cov glaze slurry thiab printing number case yog thinned yog raws li nram no: (1) Lub glaze slurry los yog luam ntawv number case yog eroded los ntawm cov kab mob, uas ua rau CMC invalid. Txoj kev daws yog kom huv si ntxuav lub ntim ntawm glaze slurry los yog number case, los yog ntxiv preservatives xws li formaldehyde thiab phenol. (2) Nyob rau hauv lub nruam stirring nyob rau hauv lub shear quab yuam, lub viscosity txo. Nws raug pom zoo kom ntxiv CMC aqueous tov los kho thaum siv.

3.3. Muab tshuaj txhuam lub vas thaum siv luam ntawv glaze.

Txoj kev daws teeb meem yog los kho tus nqi ntawm CMC kom cov viscosity ntawm cov ntawv luam tawm glaze yog nruab nrab, thiab yog tias tsim nyog, ntxiv me me dej kom sib npaug.

3.4. Muaj ntau lub sijhawm ntawm kev thaiv lub network thiab ntxuav.

Txoj kev daws teeb meem yog txhawm rau txhim kho pob tshab thiab solubility ntawm CMC; Tom qab cov roj luam ntawv tau npaj, dhau los ntawm 120-mesh sieve, thiab cov roj luam ntawv tseem yuav tsum dhau los ntawm 100-120-mesh sieve; kho cov viscosity ntawm cov luam ntawv glaze.

3.5. Kev tuav dej tsis zoo, thiab qhov chaw ntawm lub paj yuav pulverized tom qab luam ntawv, uas yuav cuam tshuam rau kev luam ntawv tom ntej.

Txoj kev daws teeb meem yog txhawm rau nce tus nqi ntawm glycerin hauv cov txheej txheem luam ntawv roj; siv nruab nrab thiab qis viscosity CMC nrog qib siab hloov pauv (zoo hloov pauv tsis zoo) los npaj cov roj luam ntawv.


Post lub sij hawm: Jan-04-2023
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