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Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer uas siv tau ntau yam hauv ntau yam lag luam, suav nrog kev tsim kho, tshuaj, khoom noj, thiab tshuaj pleev ib ce. Hauv kev tsim kho, HPMC ua lub luag haujlwm tseem ceeb ua ib qho khoom ntxiv rau hauv cov ntaub ntawv cement, tshwj xeeb tshaj yog hauv kev txhim kho lub zog sib txuas. 1.Int...Nyeem ntxiv»
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MC yog methyl cellulose, uas tau los ntawm kev kho cov paj rwb zoo nrog alkali, siv methyl chloride ua tus neeg sawv cev etherifying, thiab ua cellulose ether los ntawm ntau qhov kev tshuaj tiv thaiv. Feem ntau, qib ntawm kev hloov pauv yog 1.6 ~ 2.0, thiab solubility kuj txawv nrog ntau qib sib txawv ...Nyeem ntxiv»
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HPMC hydroxypropyl methyl cellulose chaw tsim khoom chaw tsim khoom chaw muag khoom xa tawm HPMC siv ntau npaum li cas? HPMC muaj peev xwm muab faib ua: qib kev tsim kho, qib zaub mov thiab qib kev kho mob los ntawm kev siv. HPMC siv dav hauv cov ntaub ntawv tsim kho, txheej, cov khoom siv hluavtaws, cov khoom siv av nplaum, tshuaj, khoom noj, ntaub...Nyeem ntxiv»
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Cellulose ether yog ib qho polymer compound nrog ib tug ether qauv ua los ntawm cellulose. Txhua lub glucosyl nplhaib nyob rau hauv lub cellulose macromolecule muaj peb hydroxyl pawg, lub thawj hydroxyl pawg ntawm lub thib rau carbon atom, lub thib ob hydroxyl pawg ntawm lub thib ob thiab thib peb carbon atoms, thiab lub hydrog ...Nyeem ntxiv»
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Cellulose ether yuav ua kom lub sijhawm teeb tsa ntawm cov cement paste lossis mortar net ntev dua, ncua qhov cement hydration kinetics, uas yog qhov zoo rau kev txhim kho lub sijhawm ua haujlwm ntawm cov khoom siv cement, txhim kho qhov sib xws thiab cov pob zeb poob tom qab poob, tab sis kuj tseem yuav ncua kev nce qib ntawm kev tsim kho, tshwj xeeb ...Nyeem ntxiv»
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Rau daim ntawv thov ntawm cov mortar ntub, hydroxypropyl methylcellulose muaj cov khoom zoo thickening, tuaj yeem ua rau muaj peev xwm sib txuas ntawm cov mortar ntub thiab txheej hauv paus, thiab tseem tuaj yeem txhim kho kev ua haujlwm tiv thaiv kev poob qis ntawm mortar, yog li nws yog dav siv hauv plastering Mortar, phab ntsa sab nraud ...Nyeem ntxiv»
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Qhov ua kom tuab ntawm cellulose ether nyob ntawm: qib ntawm polymerization ntawm cellulose ether, kev daws teeb meem, shear rate, kub thiab lwm yam mob. Cov khoom gelling ntawm cov tshuaj yog tshwj xeeb rau alkyl cellulose thiab nws cov derivatives hloov kho. Cov khoom gelation yog r...Nyeem ntxiv»
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1. Kub ntawm hydration Raws li qhov tso tawm ntawm qhov kub ntawm hydration dhau sijhawm, cov txheej txheem hydration ntawm cement feem ntau yog muab faib ua tsib theem, uas yog, lub sijhawm hydration pib (0 ~ 15 feeb), lub sijhawm induction (15 feeb ~ 4 teev), lub sijhawm acceleration thiab teeb tsa (4 teev ~ 8 teev), deceleration ...Nyeem ntxiv»
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Hauv kev siv cov ntaub ntawv tsim kho, hydroxypropyl methylcellulose yog cov khoom siv ntxiv rau cov ntaub ntawv tsim kho uas siv ntau dua, thiab hydroxypropyl methylcellulose siv dav hauv kev lag luam thiab muaj ntau hom. Hydroxypropyl methylcellulose tuaj yeem muab faib ua hom dej txias tam sim ntawd thiab hom kub yaj, co...Nyeem ntxiv»
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Hauv putty, cement mortar thiab gypsum-based slurry, HPMC hydroxypropyl methylcellulose ether feem ntau ua lub luag haujlwm ntawm kev khaws cia dej thiab thickening, thiab tuaj yeem txhim kho qhov adhesion thiab sag tsis kam ntawm slurry. Cov yam ntxwv xws li huab cua kub, kub thiab cua ceev yuav a ...Nyeem ntxiv»
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Hydroxypropyl methyl cellulose (HPMC) yog ib hom non-ionic cellulose ether ua los ntawm paj rwb polymer ntuj los ntawm ntau yam kev kho mob tshuaj. Hauv kev lag luam kev tsim kho, kev siv hydroxypropyl methylcellulose tseem ceeb yog dab tsi? 1, cement mortar: txhawm rau txhim kho qib ntawm cov xuab zeb cement dispersion, g ...Nyeem ntxiv»
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Faib raws li cov neeg hloov pauv, cellulose ethers tuaj yeem faib ua ib leeg ethers thiab sib xyaw ethers; faib raws li solubility, cellulose ethers tuaj yeem faib ua dej-soluble thiab dej-insoluble. Txoj kev faib tawm tseem ceeb ntawm cellulose ether yog cais raws li ioni...Nyeem ntxiv»