Cellulose Ether daim ntawv thov yog dab tsi?

Nws qhia txog kev npaj cellulose ether, cellulose ether kev ua tau zoo thiabcellulose ether daim ntawv thov, tshwj xeeb tshaj yog daim ntawv thov nyob rau hauv coatings.
Ntsiab lus: cellulose ether, kev ua tau zoo, daim ntawv thov
Cellulose yog ib tug natural macromolecular compound. Nws cov qauv tshuaj yog polysaccharide macromolecule nrog anhydrous β-glucose ua lub hauv paus nplhaib. Muaj ib pawg thawj hydroxyl thiab ob pawg hydroxyl thib ob ntawm txhua lub nplhaib. Los ntawm nws cov kev hloov kho tshuaj, muaj ntau cov cellulose derivatives tuaj yeem tau txais, thiab cellulose ether yog ib qho ntawm lawv. Cellulose ethers tau siv dav hauv ntau lub lag luam.

1. Kev npaj

Cellulose ether yog tau los ntawm reacting cellulose nrog NaOH, ces reacting nrog ntau yam functional monomers xws li monochloromethane, ethylene oxide, propylene oxide, thiab lwm yam., thiab ntxuav cov by-product ntsev thiab cellulose sodium.

2. Kev ua tau zoo

2.1 Cov tsos mob: Cellulose ether yog dawb los yog mis nyuj dawb, tsis muaj ntxhiab, tsis muaj tshuaj lom, cov hmoov fiber ntau nrog fluidity, yooj yim nqus dej, thiab yaj mus rau hauv pob tshab viscous ruaj khov colloid hauv dej.
2.2 Ionicity: MC, MHEC, MHPC, HEC yog nonionic; NaCMC, NaCMHEC yog anionic.
2.3 Etherification: Cov yam ntxwv thiab qib ntawm etherification ntawm etherification yuav cuam tshuam rau kev ua haujlwm ntawm cellulose ether thaum lub sij hawm etherification, xws li solubility, film-forming peev xwm, bonding zog thiab ntsev kuj.
2.4 Solubility: (1) MC soluble nyob rau hauv dej txias, insoluble nyob rau hauv dej kub, thiab kuj soluble nyob rau hauv ib co kuab tshuaj; MHEC yog soluble hauv dej txias, insoluble hauv dej kub thiab cov kuab tshuaj organic. Txawm li cas los xij, thaum lub aqueous tov ntawm MC thiab MHEC yog rhuab, MC thiab MHEC yuav los nag. MC precipitates ntawm 45-60 ° C, thaum nag lossis daus kub ntawm mixed etherified MHEC nce mus rau 65-80 ° C. Thaum qhov kub thiab txias yog qis, lub precipitate redissolves. (2) HEC, NaCMC, thiab NaCMHEC yog soluble hauv dej ntawm txhua qhov kub, tab sis insoluble hauv cov kuab tshuaj organic (nrog qee qhov tshwj xeeb).
2.5 Ncua o o: Cellulose ether muaj qee qhov qeeb o ntawm cov dej nruab nrab pH, tab sis nws tuaj yeem kov yeej qhov o qeeb hauv dej alkaline pH.
2.6 Viscosity: Cellulose ether dissolves nyob rau hauv dej nyob rau hauv daim ntawv ntawm colloid, thiab nws viscosity nyob ntawm seb lub degree ntawm polymerization ntawm cellulose ether. Cov tshuaj muaj hydrated macromolecules. Vim yog qhov entanglement ntawm macromolecules, tus cwj pwm ntws ntawm cov kev daws teeb meem txawv ntawm cov kua Newtonian, tab sis nthuav tawm tus cwj pwm uas hloov nrog lub zog shear. Vim yog cov qauv macromolecular ntawm cellulose ether, viscosity ntawm cov tshuaj nce sai nrog qhov nce ntawm cov concentration thiab txo qis nrog qhov kub thiab txias.
2.7 Biological stability: Cellulose ether yog siv nyob rau hauv cov dej theem. Ntev npaum li dej tsis muaj, cov kab mob yuav loj tuaj. Kev loj hlob ntawm cov kab mob ua rau kev tsim cov kab mob enzyme. Lub enzyme rhuav tshem cov unsubstituted anhydroglucose unit bonds nyob ib sab ntawm cellulose ether, txo cov molecular hnyav ntawm lub polymer. Yog li ntawd, yog hais tias lub cellulose ether aqueous tov yuav tsum tau khaws cia rau lub sij hawm ntev, ib tug preservative yuav tsum tau ntxiv rau nws. Qhov no muaj tseeb txawm tias muaj cov tshuaj tua kab mob cellulose ethers.

3. Lub hom phiaj

3.1 Oilfield: NaCMC feem ntau yog siv nyob rau hauv oilfield exploitation, thiab nws yog siv los ua av nkos kom viscosity thiab txo cov dej poob. Nws tuaj yeem tiv taus ntau yam kua ntsev ua kuab paug thiab txhim kho cov roj rov qab. Sodium carboxymethyl hydroxypropyl cellulose thiab sodium carboxymethyl hydroxyethyl cellulose yog cov zoo drilling av nkos cov neeg ua haujlwm thiab cov ntaub ntawv rau kev npaj cov kua tiav, nrog cov pulping siab, zoo ntsev thiab calcium tsis kam, Nws muaj viscosity-nce muaj peev xwm thiab kub tsis kam (160 ° C). Nws yog qhov tsim nyog rau kev npaj ua tiav cov kua dej tshiab, dej hiav txwv thiab dej ntsev saturated. Nws tuaj yeem tsim ua tiav cov kua dej ntawm ntau qhov ntom ntom (1.03-1.279 / Cm3) hauv qab qhov hnyav ntawm calcium chloride, thiab nws muaj qee yam viscosity. Thiab cov kua dej qis dua, nws cov viscosity nce lub peev xwm thiab cov kua dej tsis muaj peev xwm ua tau zoo dua li hydroxyethyl cellulose, nws yog ib qho zoo ntxiv rau cov roj ntau lawm.
3.2 Lub tsev ceramics: NaCMC tuaj yeem siv los ua cov khoom siv retarder, dej tuav tus neeg saib xyuas, thickener thiab binder, kom cov khoom siv ceramics muaj qhov zoo thiab tsis muaj qhov tsis xws luag thiab npuas.
3.3 Papermaking: NaCMC yog siv rau sab hauv thiab sab nraud sizing thiab sau thiab khaws cia ntawm daim ntawv saum npoo, thiab tuaj yeem hloov cov casein, kom cov ntawv luam ntawv tuaj yeem nkag tau yooj yim thiab cov npoo yog qhov tseeb. Hauv kev tsim cov ntawv ntsa, nws tuaj yeem siv ua xim dispersant, tackifier, stabilizer thiab sizing tus neeg saib xyuas.
3.4 Textile: NaCMC yog siv los hloov cov nplej thiab sizing hauv kev lag luam textile, thiab nws tsis yooj yim rau deteriorate thiab ua pwm. Thaum luam ntawv thiab dyeing, tsis tas yuav desizing, thiab cov dye tuaj yeem tau txais ib qho colloid nyob rau hauv dej, uas txhim kho cov hydrophilicity thiab nkag mus ntawm cov xim. Nyob rau tib lub sijhawm, vim qhov hloov me me ntawm viscosity, nws yooj yim los kho cov xim sib txawv. CMHEC yog siv los ua cov thickener rau luam ntawv thiab dyeing pulp, nrog me me residue thiab siab xim yield, thiab luam ntawv thiab dyeing zoo yog ntau dua li nws ib leeg ionic thiab non-ionic cellulose ether khoom.
3.5 Tobacco: NaCMC yog siv rau kev sib txuas ntawm cov luam yeeb. Nws yaj sai sai thiab muaj zog sib txuas, uas yog qhov zoo los txhim kho cov luam yeeb zoo thiab txo cov nqi.
3.6 Tshuaj pleev ib ce: NaCMC plays lub luag hauj lwm ntawm dispersing, suspending thiab stabilizing cov muab tshuaj txhuam cov khoom ntawm silty raw khoom, thiab plays lub luag hauj lwm ntawm thickening, dispersing thiab homogenizing nyob rau hauv kua los yog emulsion tshuaj pleev ib ce. Nws kuj tseem siv tau los ua emulsifier, thickener thiab stabilizer rau tshuaj pleev thiab tshuaj zawv plaub hau.
3.7 Roj teeb: NaCMC muaj siab purity, zoo acid thiab ntsev tsis kam, tshwj xeeb tshaj yog cov hlau tsis muaj hlau thiab hnyav hlau cov ntsiab lus, thiab cov colloid yog ruaj khov heev, haum rau alkaline roj teeb thiab zinc-manganese roj teeb.
3.8 Cov xim pleev xim rau dej: HEC thiab MHEC tuaj yeem siv los ua cov stabilizers, thickeners thiab dej-retaining agents rau cov xim latex. Tsis tas li ntawd, lawv tuaj yeem siv los ua dispersants, tackifiers thiab film-forming agents rau cov xim cement xim.
3.9 Cov ntaub ntawv hauv tsev: nws tuaj yeem siv los ua cov khoom tawg, cov dej tuav thiab cov thickener rau plaster thiab mortar ntawm gypsum hauv qab txheej thiab cement hauv qab txheej, thiab cov ntaub ntawv hauv av plastering.
3.10 Glaze: Nws tuaj yeem siv los ua cov nplaum nplaum.
3.11 Detergent: Nws tuaj yeem siv los ua cov tshuaj tiv thaiv adhesion rau thickening av.
3.12 Emulsion dispersion: nws tuaj yeem siv ua stabilizer thiab thickener.
3.13 Cov tshuaj txhuam hniav: NaCMHPC tuaj yeem siv los ua kom ruaj khov rau cov tshuaj txhuam hniav. Nws muaj cov khoom zoo thixotropic, ua rau cov tshuaj txhuam hniav zoo zoo, lub sij hawm ntev tsis muaj deformation, thiab muaj ib qho zoo sib xws thiab ilv saj. NaCMHPC muaj cov tshuaj ntsev zoo dua thiab cov kua qaub ua haujlwm, thiab nws cov txiaj ntsig zoo dua li ntawm CMC.

4. Daim ntawv thov nyob rau hauv coatings thiab pastes

Cellulose ether plays lub luag haujlwm tseem ceeb hauv cov coatings thiab pastes. Tsuas yog ntxiv tag nrho cov mis O. 2% mus rau 0.5% tuaj yeem ua kom tuab, khaws cov dej, tiv thaiv cov xim thiab cov fillers los ntawm kev daws teeb meem, thiab ua kom muaj zog adhesion thiab kev sib txuas.
4.1 Viscosity: Lub viscosity ntawm cellulose ether aqueous tov hloov nrog shear force, thiab cov xim thiab paste thickened nrog cellulose ether kuj muaj cov yam ntxwv no. Txhawm rau kom yooj yim ntawm daim ntawv thov txheej, hom thiab tus nqi ntawm cellulose ether yuav tsum tau ua tib zoo xaiv. Rau coatings, thaum siv cellulose ether, nruab nrab viscosity khoom yuav raug xaiv.
4.2 Kev tuav dej: Cellulose ether tuaj yeem tiv thaiv kom tsis txhob ya raws nkag mus rau hauv cov porous substrate, kom nws tuaj yeem tsim cov txheej txheem txheej thaum lub sij hawm tsim kho tag nrho yam tsis tau ziab sai heev. Thaum cov ntsiab lus ntawm emulsion siab, qhov yuav tsum tau muaj dej tuav tau tuaj yeem ua tau los ntawm kev siv cov cellulose ether tsawg. Cov dej tuav ntawm cov xim thiab slurries nyob ntawm qhov concentration ntawm cellulose ether thiab kub ntawm coated substrate.
4.3 Stable pigments thiab fillers: Pigments thiab fillers nyiam precipitate. Txhawm rau kom cov xim tsis sib xws thiab ruaj khov, cov xim pleev xim yuav tsum nyob rau hauv lub xeev ncua. Kev siv cellulose ether tuaj yeem ua rau cov xim muaj viscosity, thiab tsis muaj nag lossis daus yuav tshwm sim thaum khaws cia.
4.4 Adhesion thiab bonding zog: Vim lub zoo dej tuav thiab adhesion ntawm cellulose ether, zoo adhesion ntawm txheej thiab substrate yuav guaranteed. MHEC thiab NaCMC muaj zoo heev qhuav adhesion thiab adhesion, yog li lawv yog tshwj xeeb tshaj yog haum rau daim ntawv pulp, thaum HEC tsis haum rau lub hom phiaj no.
4.5 Tiv thaiv colloid muaj nuj nqi: Vim lub hydrophilicity ntawm cellulose ether, nws yuav siv tau raws li ib tug tiv thaiv colloid rau txheej.
4.6 Thickener: Cellulose ether yog dav siv nyob rau hauv cov xim latex raws li ib tug thickener los kho cov kev tsim kho viscosity. Nruab nrab thiab siab viscosity hydroxyethyl cellulose thiab methyl hydroxyethyl cellulose yog siv nyob rau hauv cov xim emulsion. Qee lub sij hawm cellulose ether kuj tuaj yeem siv ua ke nrog cov khoom siv hluavtaws (xws li polyacrylate, polyurethane, thiab lwm yam) los txhim kho qee cov khoom ntawm cov xim latex thiab muab cov xim latex ruaj khov.
Cellulose ethers tag nrho muaj cov dej tuav tau zoo thiab ua kom tuab, tab sis qee qhov khoom sib txawv. Anionic cellulose ether, yooj yim tsim cov dej-insoluble ntsev nrog divalent thiab trivalent cations. Yog li, piv nrog methyl hydroxyethyl cellulose thiab hydroxyethyl fiber, sodium carboxymethyl cellulose muaj cov tshuaj txhuam tsis zoo. Yog li sodium carboxymethyl cellulose tsuas yog siv rau hauv cov tshuaj pleev xim pheej yig.
Methyl hydroxyethyl cellulose thiab methyl hydroxypropyl cellulose muaj qis shear viscosity thiab siab dua surfactant zog tshaj hydroxyethyl cellulose, yog li txo qhov nyiam ntawm cov xim latex rau splatter. Thiab carboxymethyl cellulose tsis muaj cov nyhuv surfactant.
Hydroxyethyl cellulose muaj cov yam ntxwv zoo fluidity, tsis tshua muaj txhuam tsis kam thiab yooj yim siv hauv cov xim latex. Piv nrog methyl hydroxyethyl thiab methyl hydroxypropyl cellulose, nws muaj kev sib raug zoo nrog cov pigments, yog li nws pom zoo rau cov xim latex, cov xim latex, xim xim, thiab lwm yam.