Thickening nyhuv ntawm cellulose ether

Cellulose ether tshaj tawm cov tshuaj tua ntub nrog ua kom muaj peev xwm ua tau zoo ntawm cov txheej txheem ntub thiab txhim kho cov txheej txheem ntawm lub tshuaj khib nyiab. Nws yog dav siv nyob rau hauv plastering collase, sab nraud phab ntsa rwb thaiv tsev kev ua haujlwm thiab cib ua chlib. Cov nyhuv tuab ntawm cellulose ether kuj tseem tuaj yeem ua rau muaj kev sib xyaw ua ke, tiv thaiv kev sib xyaw ua ke, thiab cov pob zeb hauv av.

Cellulose ether huam lub viscosity ntawm cov cement-based cov ntaub ntawv los ntawm viscosity ntawm cellulose ether. Qhov ntsuas ntawm "viscosity" feem ntau yog siv los ntsuas qhov viscosity ntawm cellulose ays tov. Lub viscosity ntawm cellulose cellulose feem ntau yog hais txog lub cellulose ether nrog qee yam siab (xws li 2%). Kev nrawm (lossis sib hloov tus nqi, xws li 20 RPM), lub viscosity tus nqi ntsuas nrog cov ntsuas ntsuas ntsuas (xws li cov visicometer sib hloov).

Viscosity yog ib qho tseem ceeb ntawm kev ua haujlwm los ntsuas kev ua tau zoo ntawm cellulose ether. Qhov ntau dua viscosity ntawm cellulose cov tshuaj etherity, qhov zoo dua cov nplaum ntawm cov xas-sagging thiab tiv thaiv kev tawm tsam thiab tiv thaiv kev tawm tsam. Yog tias nws viscosity dhau lawm, nws yuav cuam tshuam rau lub fluidity thiab worcessorability ntawm cov khoom siv caas (xws li muab cov tshuab xyaw plastering thaum lub plastering coll siv). Yog li ntawd, viscosity ntawm cellulose siv nyob rau hauv qhuav-makov cug feem ntau yog 15,000 ~ 60,000 mpa. S-1, kev coj ua tus kheej thiab kev sib xyaws ua ke, uas yuav tsum muaj cov nplaim hluav taws xob ntau dua ntawm cellulose ether.

Ib qho ntxiv, cov nyhuv tuab ntawm cellulose nce cov dej xav tau cov khoom siv ntawm cov ntawv casas-raws li cov qoob loo xiss, yog li nce cov qoob loo ntawm cug.

Lub viscosity ntawm lub cellulose ether tawm yog nyob ntawm cov hauv qab no:

Molecular hnyav (lossis qib ntawm polymerization) thiab concentration ntawm cellulose ether, daws ntsuas kub, shear tus nqi thiab txoj kev xeem.

1. Lub siab dua qib ntawm polymerization ntawm cellulose ether, ntau dua cov molecular hnyav, thiab qib siab dua ntawm nws cov aqueesous;

2. Qhov siab dua cov tshuaj (lossis kev xav tau) ntawm cov tshuaj areous, thiaj li tsis cuam tshuam rau kev ua tshuaj khib thiab pob zeb ua yog li cov tshuaj hauv siab;

3. Zoo li cov kua dej feem ntau, cov viscosity ntawm cellulose ntawm cellule tov yuav txo qis nrog qhov nce thiab ntau dua ntawm cellulose ether, qhov ntau dua ntawm cov kub ntawm kub;

4. Cellulose ether cov tshuaj feem ntau yog pseudopastic, uas muaj cov cuab yeej ntawm shear thinning. Qhov ntau dua cov shear tus nqi thaum ntsuas, qis dua viscosity.

Yog li ntawd, txoj hlua khi ntawm cug yuav raug txo kom zoo vim yog lub zog sab nraud, uas yog qhov muaj txiaj ntsig rau kev tshuaj khib caj dab, yog li ntawd lub tshuaj khib tau muaj kev ua haujlwm zoo thiab cohesion tib lub sijhawm. Txawm li cas los xij, lub cellulose ether kev daws yuav teeb meem Cov Lus Teb Chaws Newtonian thaum lub siab thiab lub viscosity yog me me. Thaum cov kev txhim kho nce, txoj kev daws teeb meem yuav maj pom cov yam ntxwv zoo pseudoplastic kua cov yam ntxwv, thiab ntau pom tseeb ntawm pseudoplastic.