Kev ua haujlwm ntawm cellulose ether hauv mortar

Cellulose ethertuav dej

Kev tuav dej ntawm mortar yog hais txog lub peev xwm ntawm mortar tuav thiab kaw dej. Qhov siab dua qhov viscosity ntawm cellulose ether, qhov dej tuav tau zoo dua. Vim hais tias cov qauv cellulose muaj hydroxyl thiab ether daim ntawv cog lus, hydroxyl thiab ether daim ntawv cog lus pab pawg ntawm cov pa atoms thiab dej molecules los ua ke hydrogen daim ntawv cog lus, kom cov dej dawb rau hauv cov dej khi, dej winding, thiaj li ua lub luag haujlwm ntawm dej tuav.

Solubility ntawm cellulose ether

1. Lub coarser cellulose ether yog ib qho yooj yim rau disperse nyob rau hauv dej tsis muaj agglomerating, tab sis lub dissolution tus nqi qeeb heev. Cellulose ether hauv qab 60 mesh yog yaj hauv dej li 60 feeb.

2. Cov khoom zoo ntawm cellulose ether hauv dej yog ib qho yooj yim rau disperse thiab tsis agglomerate, thiab cov dissolution tus nqi yog nruab nrab. Cellulose ether tshaj 80 mesh yaj hauv dej li 3 feeb.

3. Ultrafine cellulose ether disperses sai sai nyob rau hauv dej, dissolves sai sai thiab tsim viscosity ceev. Cellulose ether saum 120 mesh yog yaj hauv dej li 10-30 vib nas this.

Qhov zoo dua cov cellulose ether hais, qhov zoo dua cov dej tuav, coarse hais ntawm cellulose ether thiab dej sib cuag nto tam sim ntawd yaj thiab tsim gel phenomenon. Cov kua nplaum qhwv cov khoom siv los tiv thaiv cov dej molecules kom tsis txhob nkag mus ntxiv. Qee zaum, txawm tias nplawm ntev, cov tshuaj tsis tuaj yeem sib npaug thiab yaj, tsim cov av nkos flocculent tov lossis agglomerate. Fine particles disperse thiab dissolve tam sim ntawd thaum sib cuag nrog dej los tsim ib tug uniform viscosity.

PH tus nqi ntawm cellulose ether (kev coagulation qeeb lossis thaum ntxov zog)

Tus nqi PH ntawm cellulose ether tuam ntxhab nyob hauv tsev thiab txawv teb chaws yog tswj hwm ntawm li 7, uas yog acidic. Vim tias tseem muaj ntau lub cev qhuav dej ntawm cov piam thaj hauv cov qauv molecular ntawm cellulose ether, lub nplhaib dehydrated qabzib yog cov pab pawg tseem ceeb uas ua rau cov cement qeeb. Dehydrated qabzib nplhaib tuaj yeem ua rau calcium ions hauv cov cement hydration tov cov suab thaj calcium molecular compounds, txo cov calcium ion concentration hauv cement hydration induction lub sij hawm, tiv thaiv kev tsim thiab nag lossis daus ntawm calcium hydroxide thiab calcium ntsev crystals, yog li ncua cov txheej txheem ntawm cement hydration. Yog tias tus nqi PH dhau los ua lub xeev alkaline, mortar yuav tshwm sim thaum ntxov lub zog. Tam sim no feem ntau ntawm cov chaw tsim khoom los kho PH tus nqi siv sodium carbonate, sodium carbonate yog ib hom kev ua kom nrawm, sodium carbonate tuaj yeem txhim kho kev ua haujlwm ntawm cov cement particle nto, ua kom muaj kev sib koom ua ke ntawm cov khoom nce, ntxiv txhim kho cov viscosity ntawm slurry, mortar thiab sodium carbonate thiab calcium ion compound sai, ua rau cov cement ettringite sai sai. Yog li ntawd, tus nqi PH yuav tsum raug kho raws li cov neeg siv khoom sib txawv hauv cov txheej txheem tsim khoom tiag tiag.

Cellulose ether gas induction

Cov huab cua nkag ntawm cellulose ether feem ntau yog vim cellulose ether kuj yog ib qho surfactant, kev ua haujlwm ntawm cellulose ether feem ntau tshwm sim hauv cov roj-kua-kua interface, thawj zaug yog kev taw qhia ntawm npuas, ua raws li kev tawg thiab ntub dej. Cellulose ether muaj cov pab pawg alkyl, txo qhov nro ntawm qhov chaw thiab lub zog cuam tshuam ntawm dej, dej hauv cov txheej txheem ntawm kev ntxhov siab yog yooj yim los tsim ntau cov npuas me me.

Gelation ntawm cellulose ether

Cellulose ether yaj nyob rau hauv mortar vim nws cov saw molecular ntawm methoxy thiab hydroxypropyl pawg nyob rau hauv slurry nrog calcium ions thiab txhuas ions nyob rau hauv tsim ntawm viscous gel thiab sau nyob rau hauv cement mortar sib txawv, txhim kho qhov ntom ntawm mortar, ua lub luag hauj lwm ntawm saj zawg zog filling thiab reinforcement. Txawm li cas los xij, thaum lub sib xyaw matrix raug nias, lub polymer tsis tuaj yeem ua kom tsis muaj zog, yog li lub zog thiab compression piv ntawm mortar txo.

Zaj duab xis tsim ntawmcellulose ether

Ib zaj duab xis nyias nyias yog tsim ntawm cellulose ether thiab cement hais tom qab hydration. Cov yeeb yaj kiab muaj cov nyhuv sealing thiab txhim kho qhov tshwm sim qhuav ntawm cov mortar. Vim hais tias cov cellulose ether muaj cov dej tuav zoo, tswj cov dej molecules txaus nyob rau hauv lub mortar, yog li ua kom lub zog ntawm cov cement hydration thiab hardening thiab tag nrho txoj kev loj hlob, txhim kho lub zog sib txuas ntawm mortar, nyob rau tib lub sij hawm txhim kho cov nplaum ntawm cement mortar, mortar muaj zoo plasticity thiab toughness, txo cov ntawv cog lus.