Kev tuav dej ntawm hydroxypropyl methylcellulose ether
Kev tuav dej ntawm cov khoom sib tov qhuav yog hais txog lub peev xwm ntawm mortar tuav thiab kaw dej. Qhov siab dua qhov viscosity ntawm hydroxypropyl methylcellulose ether, qhov dej tuav tau zoo dua. Vim hais tias cov qauv cellulose muaj hydroxyl thiab ether bonds, cov pa atoms ntawm hydroxyl thiab ether bond pawg koom nrog cov dej molecules los tsim hydrogen bonds, kom cov dej dawb ua cov dej khi thiab entangles dej, yog li ua lub luag haujlwm hauv dej tuav.
Solubility ntawm Hydroxypropyl Methyl Cellulose Ether
1. Coarse particle cellulose ether yog ib qho yooj yim rau disperse nyob rau hauv dej yam tsis muaj agglomeration, tab sis lub dissolution tus nqi qeeb heev. Cellulose ether hauv qab 60 mesh yog yaj hauv dej li 60 feeb.
2. Fine particle cellulose ether yog ib qho yooj yim rau disperse nyob rau hauv dej tsis muaj agglomeration, thiab cov dissolution tus nqi yog nruab nrab. Cellulose ether saum 80 mesh yog yaj hauv dej li 3 feeb.
3. Ultra-fine particle cellulose ether disperses sai sai hauv dej, dissolves sai, thiab ua viscosity sai. Cellulose ether saum 120 mesh yaj hauv dej li 10-30 vib nas this.
Qhov zoo dua cov khoom ntawm hydroxypropyl methylcellulose ether, qhov zoo dua cov dej tuav. Qhov saum npoo ntawm coarse-grained cellulose ether dissolves tam sim ntawd tom qab sib cuag nrog dej thiab tsim ib tug gel tshwm sim. Cov kua nplaum qhwv cov khoom siv los tiv thaiv cov dej molecules los ntawm kev txuas ntxiv mus. Qee lub sij hawm nws tsis tuaj yeem sib cais thiab yaj txawm tias tom qab lub sij hawm ntev nplawm, tsim cov huab flocculent tov los yog agglomeration. Cov khoom zoo disperse thiab dissolve tam sim ntawd tom qab sib cuag nrog dej los tsim ib tug uniform viscosity.
PH tus nqi ntawm hydroxypropyl methylcellulose ether (retarding los yog thaum ntxov zog)
Tus nqi pH ntawm hydroxypropyl methylcellulose ether tuam ntxhab nyob hauv tsev thiab txawv teb chaws yog tswj hwm ntawm li 7, uas yog nyob rau hauv lub xeev acidic. Vim tias tseem muaj ntau tus qauv ntawm cov nplhaib anhydroglucose hauv cov qauv molecular ntawm cellulose ether, lub nplhaib anhydroglucose yog cov pab pawg tseem ceeb uas ua rau cov cement retardation. Lub nplhaib anhydroglucose tuaj yeem ua rau calcium ions hauv cov cement hydration tov tsim cov suab thaj-calcium molecular compounds, txo cov calcium ion concentration thaum lub sij hawm induction ntawm cement hydration, tiv thaiv kev tsim thiab nag lossis daus ntawm calcium hydroxide thiab calcium ntsev crystals, thiab ncua lub hydration ntawm cov cement hydration. cement. txheej txheem. Yog tias tus nqi PH nyob rau hauv lub xeev alkaline, cov tshuaj khib yuav tshwm sim hauv lub xeev muaj zog thaum ntxov. Tam sim no feem ntau cov chaw tsim khoom siv sodium carbonate los kho tus nqi pH. Sodium carbonate yog ib hom kev teeb tsa ceev ceev. Sodium carbonate txhim kho qhov kev ua tau zoo ntawm qhov chaw ntawm cov cement hais, txhawb kev sib koom ua ke ntawm cov khoom, thiab ntxiv txhim kho cov viscosity ntawm mortar. Nyob rau tib lub sijhawm, sodium carbonate sai sai ua ke nrog calcium ions hauv mortar los txhawb kev tsim ntawm ettringite, thiab cov cement coagulates sai heev. 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.
Cua Entraining Properties ntawm Hydroxypropyl Methyl Cellulose Ether
Cov huab cua-entraining nyhuv ntawm hydroxypropyl methylcellulose ether yog vim cellulose ether kuj yog ib hom surfactant. Kev ua haujlwm ntawm lub ntsej muag ntawm cellulose ether feem ntau tshwm sim ntawm cov roj-kua-khoom sib cuam tshuam. Ua ntej, kev taw qhia ntawm huab cua npuas, ua raws li dispersion thiab Wetting nyhuv. Cellulose ether muaj cov pab pawg alkyl, uas txo qhov nro ntawm qhov chaw thiab lub zog ntawm cov dej, ua rau nws yooj yim los tsim ntau cov npuas me me thaum lub sij hawm stirring txheej txheem ntawm cov kua aqueous.
Gel Properties ntawm Hydroxypropyl Methyl Cellulose Ether
Tom qab hydroxypropyl methylcellulose ether yaj nyob rau hauv mortar, methoxyl thiab hydroxypropyl pawg ntawm cov saw molecular yuav hnov mob nrog cov calcium ions thiab txhuas ions hauv slurry los tsim cov kua nplaum gel thiab sau rau hauv cov cement mortar void. , txhim kho lub compactness ntawm mortar, ua si lub luag hauj lwm ntawm saj zawg zog filling thiab reinforcement. Txawm li cas los xij, thaum qhov sib xyaw matrix nyob rau hauv siab, cov polymer tsis tuaj yeem ua lub luag haujlwm ruaj khov, yog li lub zog thiab folding piv ntawm mortar txo.
Zaj duab xis tsim ntawm Hydroxypropyl Methyl Cellulose Ether
Tom qab hydroxypropyl methyl cellulose ether ntxiv rau hydration, ib txheej nyias ntawm latex zaj duab xis yog tsim ntawm cov cement hais. Cov yeeb yaj kiab no muaj cov nyhuv sealing thiab txhim kho qhov ziab ntawm qhov mortar. Vim tias cov dej tuav tau zoo ntawm hydroxypropyl methylcellulose ether, cov dej molecules txaus tau khaws cia rau hauv lub mortar, yog li ua kom cov hydration hardening ntawm cov cement thiab tag nrho txoj kev loj hlob ntawm lub zog, kev txhim kho lub zog ntawm lub mortar, thiab tib lub sij hawm nws. txhim kho cov cohesion ntawm mortar, ua rau cov mortar muaj zoo plasticity thiab yooj, thiab txo qhov shrinkage thiab deformation ntawm mortar.
Post lub sij hawm: May-23-2023