Kev khaws dej ntawm hydroxypropyl methylcellulose ether
Qhov khaws dej ntawm cov tshuaj khib qhuav yog hais txog lub peev xwm ntawm cov tshuaj khib los tuav thiab kaw dej. Qhov viscosity ntawm hydroxypropyl methylcellulose ether siab dua, qhov zoo dua qhov khaws dej. Vim tias cov qauv cellulose muaj cov hydroxyl thiab ether bonds, cov pa oxygen ntawm cov hydroxyl thiab ether bond pawg koom nrog cov dej molecules los tsim cov hydrogen bonds, yog li ntawd cov dej dawb dhau los ua dej khi thiab sib xyaw dej, yog li ua lub luag haujlwm hauv kev khaws dej.
Kev yaj ntawm Hydroxypropyl Methyl Cellulose Ether
1. Cov khoom me me cellulose ether yooj yim tawg rau hauv dej yam tsis muaj kev sib sau ua ke, tab sis qhov nrawm ntawm kev yaj qeeb heev. Cellulose ether hauv qab 60 mesh yaj hauv dej li 60 feeb.
2. Cov khoom me me cellulose ether yooj yim tawg rau hauv dej yam tsis muaj kev sib sau ua ke, thiab qhov nrawm ntawm kev yaj yog qhov nruab nrab. Cellulose ether saum 80 mesh yaj hauv dej li 3 feeb.
3. Cov khoom me me cellulose ether tawg sai sai hauv dej, yaj sai, thiab ua rau viscosity sai. Cellulose ether saum 120 mesh yaj hauv dej li 10-30 vib nas this.
Cov khoom me me ntawm hydroxypropyl methylcellulose ether, qhov zoo dua qhov khaws cia dej. Qhov saum npoo ntawm cov cellulose ether uas muaj cov noob loj loj yaj tam sim ntawd tom qab kov dej thiab tsim cov gel phenomenon. Cov kua nplaum qhwv cov khoom kom tiv thaiv cov dej molecules kom tsis txhob nkag mus. Qee zaum nws tsis tuaj yeem yaj thiab sib npaug txawm tias tom qab do ntev, tsim cov kua flocculent lossis agglomeration. Cov khoom me me yaj thiab yaj tam sim ntawd tom qab kov dej kom tsim cov viscosity sib npaug.
Tus nqi PH ntawm hydroxypropyl methylcellulose ether (retarding lossis thaum ntxov zog nyhuv)
Tus nqi pH ntawm hydroxypropyl methylcellulose ether manufacturers hauv tsev thiab txawv teb chaws feem ntau yog tswj hwm ntawm kwv yees li 7, uas yog nyob rau hauv lub xeev acidic. Vim tias tseem muaj ntau tus qauv anhydroglucose nplhaib hauv cov qauv molecular ntawm cellulose ether, lub nplhaib anhydroglucose yog pawg tseem ceeb uas ua rau cement qeeb. Lub nplhaib anhydroglucose tuaj yeem ua rau calcium ions hauv cov tshuaj cement hydration tsim cov suab thaj-calcium molecular compounds, txo qhov calcium ion concentration thaum lub sijhawm induction ntawm cement hydration, tiv thaiv kev tsim thiab nag ntawm calcium hydroxide thiab calcium ntsev crystals, thiab ncua qhov hydration ntawm cement. txheej txheem. Yog tias tus nqi PH nyob rau hauv lub xeev alkaline, lub mortar yuav tshwm sim hauv lub xeev thaum ntxov-lub zog. Tam sim no feem ntau cov Hoobkas siv sodium carbonate los kho tus nqi pH. Sodium carbonate yog ib hom neeg sawv cev ceev ceev. Sodium carbonate txhim kho kev ua tau zoo ntawm qhov chaw ntawm cov cement particles, txhawb kev sib koom ua ke ntawm cov khoom me me, thiab txhim kho qhov viscosity ntawm mortar. Tib lub sijhawm, sodium carbonate sai sai sib xyaw nrog calcium ions hauv mortar los txhawb kev tsim ntawm ettringite, thiab cov cement coagulates 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.
Cov Khoom Siv Huab Cua ntawm Hydroxypropyl Methyl Cellulose Ether
Qhov cuam tshuam ntawm huab cua ntawm hydroxypropyl methylcellulose ether yog vim tias cellulose ether kuj yog ib hom surfactant. Kev ua haujlwm ntawm cellulose ether feem ntau tshwm sim ntawm qhov sib txuas ntawm cov roj-kua-khoom. Ua ntej, kev qhia txog cov npuas cua, ua raws li kev tawg thiab cov nyhuv ntub. Cellulose ether muaj cov pab pawg alkyl, uas txo qhov nro ntawm qhov chaw thiab lub zog ntawm dej, ua rau nws yooj yim los tsim ntau lub npuas me me thaum lub sijhawm sib xyaw ntawm cov kua dej.
Cov Khoom Gel ntawm Hydroxypropyl Methyl Cellulose Ether
Tom qab cov hydroxypropyl methylcellulose ether yaj hauv cov tshuaj khib, cov methoxyl thiab hydroxypropyl pawg ntawm cov saw hlau molecular yuav cuam tshuam nrog cov calcium ions thiab aluminium ions hauv cov slurry los ua cov gel viscous thiab sau rau hauv qhov khoob ntawm cov cement mortar. , txhim kho qhov compactness ntawm cov tshuaj khib, ua lub luag haujlwm ntawm kev hloov pauv thiab kev txhawb nqa. Txawm li cas los xij, thaum lub composite matrix nyob rau hauv kev nyuaj siab, cov polymer tsis tuaj yeem ua lub luag haujlwm txhawb nqa, yog li lub zog thiab qhov sib piv ntawm cov tshuaj khib txo qis.
Kev Tsim Zaj Duab Xis ntawm Hydroxypropyl Methyl Cellulose Ether
Tom qab ntxiv hydroxypropyl methyl cellulose ether rau hydration, ib txheej nyias ntawm cov zaj duab xis latex yog tsim ntawm cov cement me me. Zaj duab xis no muaj cov nyhuv sealing thiab txhim kho qhov qhuav ntawm cov mortar. Vim yog qhov zoo ntawm hydroxypropyl methylcellulose ether, cov dej molecule txaus khaws cia rau hauv cov mortar, yog li ua kom cov cement tawv thiab kev txhim kho tag nrho ntawm lub zog, txhim kho lub zog sib txuas ntawm cov mortar, thiab tib lub sijhawm nws txhim kho qhov sib koom ua ke ntawm cov mortar, ua rau cov mortar muaj cov yas zoo thiab yooj ywm, thiab txo qhov shrinkage thiab deformation ntawm cov mortar.
Lub sijhawm tshaj tawm: Tsib Hlis-23-2023