Cov pab pawg hydroxyl ntawmCellulose ethermolecules thiab cov pa atoms ntawm Eringcher Bonds nrog cov dej lwg roj, tig mus rau hauv cov dej khi, yog li ua lub luag haujlwm hauv dej kom ruaj khov; Kev sib nrig sib hloov ntawm cov dej lwg me thiab cellulose ither molecule pacecular tso rau hauv dej sab hauv thiab entangled, uas txhim kho cov dej khaws cia xis mas slurry; Cellulose ether txhim kho cov khoom siv hluav taws xob, cov qauv network ntawm cov khoom noj tshiab ntawm cellulose ntawm cov diffusion ntawm dej.
Cov dej khaws cia ntawm cellulose ether nws tus kheej los ntawm solubility thiab lub cev qhuav dej ether nws tus kheej. Lub peev xwm ntawm hydration ntawm hydroxyl pawg neeg tsis txaus them rau cov zog hydrogen thiab van der waals rog ntawm molecules, yog li nws tsuas yog sweds tab sis tsis yaj hauv dej. Thaum cov neeg hloov pauv tau qhia rau hauv cov molecular chart, tsis tsuas yog ua kom lub pob txha caj dab, tab sis kuj tseem tab tom cuam tshuam vim kev sib tw ntawm cov chaw nyob ntawm cov saw hlau nyob ib sab. Qhov loj dua cov kev ncua deb ntawm cov lwg me me, thiab ntau dua cov txiaj ntsig ntawm kev rhuav tshem hydrogen bonds. Tom qab lub cellulose lattice swells, thiab lub cellulose ether los ua dej-solos-soluct-edcoror, uas tom qab ntawd ua lub luag haujlwm hauv lub luag haujlwm hauv dej rov qab.
Qhov cuam tshuam cuam tshuam rau kev ua haujlwm hauv dej:
Viscosity: Ntau dua Viscosity ntawm cellulose kev ua tau zoo, tab sis nws cov solubility ete, uas muaj qhov tsis zoo ntawm kev xav thiab kev tsim kho ntawm cug cug. Feem ntau hais lus, rau tib cov khoom lag luam, cov tshuaj viscosity tau ntsuas los ntawm cov qauv sib txawv, yog li muab piv rau tib txoj kev ntsuas (suav nrog qhov kub thiab lwm yam).
Ib qho ntxiv ntawm tus nqi: Qhov ntau dua ntawm cov cellulose ether ntxiv rau lub cug tshuaj ntsuab, qhov zoo dua cov dej kom ua tau zoo. Feem ntau, ib qho me me ntawm cellulose ether tuaj yeem txhim kho cov dej khaws cia cug. Thaum tus nqi nce mus txog ib qib, cov qauv ntawm kev nce dej hauv dej rov qab qeeb qeeb.
Particle Fineness: cov khoom siv nplua nuj, qhov zoo dua cov dej khaws cia. Thaum cov khoom loj ntawm cov cellulose ethows tuaj rau hauv kev sib cuag nrog dej kom tiv thaiv cov khoom siv roj av los ntawm kev nkag mus ntxiv. Qee zaum, txawm tias lub sij hawm ntev stirring tsis tuaj yeem ua tiav kev sib cais thiab kev sib cais, uas cuam tshuam rau cov dej tuav ntawm cellulose ether. Solubility yog ib qho ntawm cov ntsiab lus rau xaiv cov cellulose ether. Fineness tseem yog ib qho tseem ceeb ua kev ua tau zoo ntawm methyl cellulose ether. Cov txiaj ntsig zoo rau cov solubility ntawm methyl cellulose ether. Coarser MC feem ntau yog cov khoom siv tau yooj yim thiab tuaj yeem ua tau yooj yim, tab sis nws tsis haum rau siv hauv cov tshuaj khib.
Qhov kub thiab txias: raws li cov dej ntws ntawm cov neeg muaj kev pab cuam cellulose feem ntau muaj cov neeg ua haujlwm cellulos tseem muaj cov dej zoo nyob rau hauv qhov kub thiab txias; Thaum qhov kub nce, cov hydration ntawm cov polymers muaj zog tsis muaj zog, thiab cov dej ntawm txoj saw hlau raug ntiab tawm. Thaum lub cev qhuav dej yog qhov txaus, cov lwg me me pib ua kev sib sau ua ke los ua peb-seem network qauv gel.
Cov qauv molecular: cov kws kho mob cellulose nrog rau qhov chaw poob qis muaj cov dej ua kom muaj dej zoo dua.
Thickening thiab thixotropy
Thickening:
Cov nyhuv ntawm kev sib raug zoo thiab los tiv thaiv kev ua tau zoo: uas muaj peev xwm ua kom cov tshuaj tua hluav taws xob zoo nkauj nrog lub hauv paus txheej thiab txhim kho kev tawm tsam ntawm cug. Nws yog dav siv nyob rau hauv plastering cultiv, ntaub pua rooj tog thiab phab ntsa sab nraud rwb thaiv tsev ua haujlwm 3.
Nyhuv rau cov khoom homogeneity: cov nyhuv tuab ntawm cov khoom siv tshuaj tiv thaiv cellulose tuaj yeem ua rau cov khoom siv hluav taws xob, thiab tuaj yeem siv rau hauv cov qhob fiber ntau, thiab tuaj yeem siv rau hauv cov pob zeb ua kom zoo nkauj, thiab cov pob zeb hauv qab. Cov.
Tau qhov twg los thiab cuam tshuam ntawm thickening nyhuv: cov nyhuv thickening ntawm cellulose cov ntaub ntawv ntawm corcosity ntawm cellulose ntawm cov tshuaj ether ether. Raws li tib qho kev mob, ntau dua lub viscosity ntawm cellulose cov ntaub ntawv, tab sis yog tias lub viscosity yog siab dhau, nws yuav cuam tshuam rau cov khoom siv flucosity thiab cov haujlwm ntawm cov khoom siv (xws li lo rau lub tshuab plastering ). Tus kheej-leveling cug thiab tus kheej-compacting qhob nrog siab flucosity ntawm cellulose ether. Ib qho ntxiv, cov nyhuv tuab ntawm cellulose ether yuav tseem yuav ua rau cov ntaub ntawv tso dej thiab nce cov zis ntawm kev tshuaj khib.
Thixotropy:
High-viscosity cellulose ethooure kua muaj siab thixotrostropy, uas tseem yog tus yam ntxwv loj ntawm cellulose ether. Cov tshuaj autterual ntawm methyl cellulose feem ntau muaj pseudoplastic thiab kev nthuav tawm cov khoom kub thiab txias, tab sis kev nthuav dav Newtonian Flow cov khoom ntawm cov nqi qis shear. Pseudoplastic nce nrog kev nce ntawm cellulose ither molecular hnyav lossis siab, thiab tsis muaj dab tsi ua rau hom kev hloov chaw thiab qib hloov chaw. Yog li ntawd, cellulose cov neeg hais txog ntawm tib tus qauv viscosity, lossis hemc, ib txwm qhia tib yam li kev xav thiab kub nyob tas li. Thaum qhov kub nce, cov qauv teeb tsa yog tsim, thiab qhov siab thixotropic txaus tshwm sim. Cellulose muaj cov neeg muaj kev pab cuam hauv lub siab thiab cov viscosity qis thiab qis viscosity qhia thixotropy txawm nyob hauv qab ntawm cov gel kub. Cov cuab yeej no tau muaj txiaj ntsig zoo heev rau kev kho cov leveling thiab sagging ntawm cug tshuaj tshuaj thaum kev tsim kho.
Cua Nkag Mus
Lub hauv paus ntsiab lus thiab cov nyhuv ntawm kev ua haujlwm zoo: Cellulose ether muaj qhov kev siv huab cua loj uas muaj cov khoom siv tshiab. Cellulose ether muaj ob pab pawg hydroughilic (cov pab pawg hydroxyl, pawg hydrophobic (cov methyl pawg, ib ncig ntawm cov hmoov av). Nws yog surfactant nrog cov haujlwm saum npoo av, yog li muaj cov nyhuv cua. Cov pa hluav taws xob cua nkag yuav tsim cov nyhuv pob, uas tuaj yeem txhim kho kev ua haujlwm fresant cov kev lis dej num thaum lub sijhawm cug; Nws tseem yuav nce ntxiv cov zis tawm ntawm txoj kab hlau tshuaj thiab txo cov nqi ntau lawm ntawm cug.
Cov nyhuv ntawm cov tshuab khoom siv: huab cua nkag yuav ua rau cov khoom siv tawv nqaij ntawm cov khoom siv tawv me me xws li muaj zog thiab lub zog loj.
Nyhuv rau fluacity: raws li surfactant, cellulose ether kuj muaj cov txiaj ntsig ntub dej ntawm cov khoom siv pa roj av, tab sis nws cov nyhuv tuab yuav txo cov nyhuv. Cov nyhuv ntawm cellulose ether rau ntawm fluas ntawm cov ntxhib-based cov ntaub ntawv yog kev sib xyaw ua ke thiab thickening cuam tshuam. Feem ntau hais lus, thaum lub cellulose ether cov tshuaj yog tsawg heev, nws tsuas yog ua kom yooj yim los yog dej txo qis; Thaum cov tshuaj yog qhov siab, cov nyhuv tuab ntawm cellulose nce nrawm, thiab nws cov pa tawm sai sai, yog li nws ua kom ua kom tuab lossis ua kom dej ntxiv.
Lub Sijhawm Post: Dec-23-2024