Lub luag haujlwm ntawm cellulose ether hauv mortar

Cellulose etherkev khaws dej

Kev khaws dej ntawm cov mortar txhais tau hais tias cov mortar muaj peev xwm tuav thiab kaw dej. Qhov viscosity ntawm cellulose ether siab dua, qhov zoo dua qhov khaws dej. Vim tias cov qauv cellulose muaj hydroxyl thiab ether bond, hydroxyl thiab ether bond pawg ntawm cov pa oxygen thiab cov dej molecules los ua ke hydrogen bond, yog li ntawd cov dej dawb rau hauv dej khi, winding dej, yog li ua lub luag haujlwm ntawm kev khaws dej.

Kev yaj ntawm cellulose ether

1. Cov cellulose ether coarser yooj yim rau disperse hauv dej yam tsis muaj agglomerating, tab sis qhov kev yaj qeeb heev. Cellulose ether hauv qab 60 mesh yog yaj hauv dej li 60 feeb.

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

3. Ultrafine cellulose ether tawg sai sai hauv dej, yaj sai thiab tsim cov viscosity sai. Cellulose ether saum 120 mesh yaj hauv dej li 10-30 vib nas this.

Cov cellulose ether me me npaum li cas, qhov zoo dua qhov khaws dej, cov cellulose ether loj thiab dej sib cuag nto tam sim ntawd yaj thiab tsim cov gel phenomenon. Cov kua nplaum qhwv cov khoom kom tiv thaiv cov dej molecules kom tsis txhob nkag mus. Qee zaum, txawm tias do ntev ntev, cov tshuaj tsis tuaj yeem sib kis thiab yaj sib npaug, tsim cov kua nplaum flocculent lossis agglomerate. Cov khoom me me sib kis thiab yaj tam sim ntawd thaum sib cuag nrog dej kom tsim cov viscosity sib xws.

Tus nqi PH ntawm cellulose ether (qeeb coagulation lossis lub zog thaum ntxov)

Tus nqi PH ntawm cov chaw tsim khoom cellulose ether hauv tsev thiab txawv teb chaws feem ntau tswj tau li ntawm 7, uas yog acidic. Vim tias tseem muaj ntau lub nplhaib glucose dehydrated hauv cov qauv molecular ntawm cellulose ether, lub nplhaib glucose dehydrated yog pawg tseem ceeb uas ua rau cement qeeb. Lub nplhaib glucose dehydrated tuaj yeem ua rau calcium ions hauv cov tshuaj cement hydration tsim cov suab thaj calcium molecular compounds, txo qhov concentration ntawm calcium ion hauv lub sijhawm cement hydration induction, tiv thaiv kev tsim thiab nag ntawm calcium hydroxide thiab calcium ntsev crystals, yog li ncua cov txheej txheem ntawm cement hydration. Yog tias tus nqi PH dhau los ua alkaline xeev, mortar yuav tshwm sim thaum ntxov lub zog xeev. Tam sim no feem ntau ntawm cov Hoobkas los kho tus nqi PH siv sodium carbonate, sodium carbonate yog ib hom neeg sawv cev accelerating, sodium carbonate tuaj yeem txhim kho kev ua tau zoo ntawm cov cement particle nto, ua rau kev sib koom ua ke ntawm cov khoom me me nce ntxiv, txhim kho qhov viscosity ntawm slurry, mortar thiab sodium carbonate thiab calcium ion compound sai sai, ua rau kev tsim ntawm ettringite, cement condensation sai sai. Yog li ntawd, tus nqi PH yuav tsum tau kho raws li cov neeg siv khoom sib txawv hauv cov txheej txheem tsim khoom tiag tiag.

Kev tsim cov roj cellulose ether

Qhov cua nkag ntawm cellulose ether yog vim cellulose ether kuj yog ib qho surfactant, qhov kev ua haujlwm ntawm cellulose ether feem ntau tshwm sim hauv qhov sib txuas ntawm cov roj-kua-khoom, thawj zaug yog kev qhia txog cov npuas, ua raws li kev tawg thiab ntub. Cellulose ether muaj cov pab pawg alkyl, txo qhov nro ntawm qhov chaw thiab lub zog ntawm cov dej, cov dej daws teeb meem hauv cov txheej txheem ntawm kev ntxhov siab yog yooj yim los tsim ntau lub npuas me me.

Kev sib xyaw ua ke ntawm cellulose ether

Cellulose ether yaj hauv cov mortar vim nws cov saw molecular ntawm methoxy thiab hydroxypropyl pawg hauv cov slurry nrog calcium ions thiab txhuas ions hauv kev tsim cov viscous gel thiab sau rau hauv qhov sib txawv ntawm cov cement mortar, txhim kho qhov ceev ntawm mortar, ua lub luag haujlwm ntawm kev hloov pauv thiab kev txhawb nqa. Txawm li cas los xij, thaum lub composite matrix raug nias, cov polymer tsis tuaj yeem ua lub luag haujlwm txhawb nqa, yog li lub zog thiab qhov sib piv ntawm cov mortar txo qis.

Kev tsim zaj duab xis ntawmcellulose ether

Tom qab ua kom cov cellulose ether thiab cov cement sib xyaw ua ke, cov latex zaj duab xis nyias nyias raug tsim los ntawm. Cov zaj duab xis no muaj cov nyhuv sealing thiab ua kom cov mortar qhuav zoo dua. Vim tias cov cellulose ether khaws dej zoo, nws khaws cov dej txaus rau hauv cov mortar, yog li ua kom cov cement noo thiab tawv thiab txhim kho tag nrho, txhim kho lub zog sib txuas ntawm mortar, tib lub sijhawm txhim kho qhov nplaum ntawm cov cement mortar, cov mortar muaj cov yas zoo thiab tawv, txo cov mortar contraction deformation.