High-purity Methyl Hydroxyethyl Cellulose (MHEC) yog ib qho tseem ceeb additive nyob rau hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog nyob rau hauv mortars. Nws lub luag haujlwm tseem ceeb ua tus neeg saib xyuas dej muaj feem cuam tshuam rau kev ua haujlwm, ua haujlwm ntev, thiab kev ua haujlwm ntawm mortars.
Cov khoom ntawm High-Purity MHEC
1. Chemical Structure thiab Purity:
MHEC yog cellulose derivative tau los ntawm etherification ntawm cellulose nrog methyl thiab hydroxyethyl pawg. Nws cov qauv tshuaj muaj xws li hydroxyl (-OH) pawg uas pab txhawb hydrogen bonding nrog dej molecules, txhim kho nws cov peev xwm tuav dej. High-purity MHEC yog tus cwj pwm los ntawm kev hloov pauv siab (DS) thiab qib qis ntawm polymerization (DP), ua rau kom zoo dua solubility thiab sib xws hauv kev siv tshuaj khib nyiab.
2. Solubility thiab viscosity:
High-purity MHEC yog soluble hauv dej txias thiab kub tab sis insoluble nyob rau hauv feem ntau cov organic solvents. Nws cov viscosity sib txawv nrog cov concentration thiab kub, ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm thiab cohesion ntawm mortar. Lub viscosity ntawm MHEC cov kev daws teeb meem ncaj qha cuam tshuam rau cov dej tuav cov khoom, vim tias cov viscosity siab dua tuaj yeem txhim kho qhov khi ntawm cov dej hauv cov tshuaj khib nyiab.
Mechanisms of Water Retention
1. Tsim kom muaj Gel-Like Network:
Raws li kev sib cais hauv dej, MHEC tsim cov kua nplaum, gel zoo li lub network uas ntxiab dej molecules. Qhov kev sib txuas no ua rau muaj kev cuam tshuam, ua kom qeeb ntawm cov evaporation thiab nqus dej los ntawm cov khoom nyob ib puag ncig, xws li cov cement thiab aggregates. Cov qauv zoo li gel muab kev tswj hwm tso dej, qhov tseem ceeb rau kev ua kom dej zoo ntawm cov cement hais.
2. Txo qhov Capillary Action:
High-purity MHEC txo cov capillary ua nyob rau hauv lub mortar los ntawm sau cov micro-pores thiab capillaries nrog nws gel-zoo li network. Qhov kev txo qis no txo qis kev txav ntawm cov dej mus rau saum npoo, qhov twg nws tuaj yeem evaporate. Yog li ntawd, cov ntsiab lus dej sab hauv tseem nyob ruaj khov, txhawb kev kho kom zoo dua qub thiab hydration.
3. Txhim kho Cohesion thiab Stability:
MHEC txhim kho cov cohesion ntawm mortar los ntawm kev ua kom cov viscosity thiab tsim kom muaj kev sib xyaw kom ruaj khov. Qhov kev ruaj ntseg no tiv thaiv kev sib cais ntawm cov khoom thiab ua kom muaj kev sib faib ntawm cov dej thoob plaws hauv lub mortar. Lub cohesive xwm ntawm MHEC kuj txhim kho cov adhesion ntawm mortar rau substrates, txo shrinkage thiab cracking.
Cov txiaj ntsig ntawm High-Purity MHEC hauv Mortar
1. Ua haujlwm tau zoo:
Cov dej tuav cov khoom ntawm MHEC txhim kho kev ua haujlwm ntawm mortar los ntawm kev tswj cov dej noo zoo ib yam. Qhov no ua rau muaj kev sib xyaw ua ke zoo dua, ntau dua pliable uas yooj yim rau kev thov thiab zoo li qub. Kev txhim kho kev ua haujlwm tau zoo tshwj xeeb rau cov ntawv thov xws li plastering thiab pobzeb nplaum, qhov yooj yim ntawm daim ntawv thov yog qhov tseem ceeb.
2. Lub Sijhawm Qhib Ntxiv:
High-purity MHEC ncua lub sijhawm qhib ntawm mortar, tso cai rau ntau lub sijhawm rau kev hloov kho thiab ua tiav ua ntej lub mortar. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv cov huab cua kub los yog qhuav qhov twg evaporation ceev tuaj yeem ua rau kom qhuav ntxov ntxov thiab txo qis zog. Los ntawm kev khaws dej, MHEC ua kom lub sijhawm ua haujlwm ntev dua, txhim kho qhov zoo ntawm daim ntawv thov zaum kawg.
3. Cov dej zoo dua thiab kev txhim kho muaj zog:
Kev ywg dej kom raug yog qhov tseem ceeb rau kev txhim kho lub zog thiab kav ntev hauv cov cement-based mortars. High-purity MHEC ua kom cov dej txaus muaj rau cov txheej txheem hydration, ua kom zoo dua tsim cov calcium silicate hydrates (CSH), uas yog lub luag hauj lwm rau lub zog thiab kev ncaj ncees ntawm cov mortar. Qhov no ua rau cov khoom tiav thiab ruaj khov dua.
4. Tiv thaiv kev tawg thiab Shrinkage:
Los ntawm khaws cia cov dej thiab tswj cov dej noo zoo ib yam, MHEC txo qhov kev pheej hmoo ntawm kev ziab kom qhuav thiab tawg. Cov mortars uas tsis muaj dej tuav txaus yuav ua rau me me thiab tawg thaum lawv qhuav, cuam tshuam cov qauv kev ncaj ncees thiab kev zoo nkauj ntawm daim ntawv thov. MHEC txo cov teeb meem no los ntawm kev ua kom cov txheej txheem ua kom qhuav thiab qhuav.
5. Compatibility nrog lwm yam additives:
High-purity MHEC yog sib xws nrog ntau yam ntawm lwm yam additives siv nyob rau hauv mortar formulations, xws li plasticizers, accelerators, thiab retarders. Qhov kev sib raug zoo no tso cai rau kev hloov kho kom haum rau cov cuab yeej mortar yam tsis muaj kev cuam tshuam cov txiaj ntsig kev tuav dej los ntawm MHEC. Nws pab txhawb kev tsim cov mortars tshwj xeeb rau kev siv sib txawv thiab ib puag ncig.
Kev siv tswv yim ntawm MHEC hauv mortar
1. Pobzeb Adhesives:
Hauv cov nplais nplaum, MHEC high-purity txhim kho adhesion, ua haujlwm tau, thiab lub sijhawm qhib, ua kom yooj yim rau txoj hauj lwm thiab kho cov vuas. Cov dej tuav cov khoom tiv thaiv kom qhuav ntxov ntxov, ua kom muaj kev sib raug zoo thiab txo qhov kev pheej hmoo ntawm cov vuas detaching dhau sijhawm.
2. Plaster thiab Render:
MHEC txhim kho kev sib kis thiab kev sib koom ua ke ntawm kev sib xyaw, ua rau kom muaj kev sib tw zoo dua. Lub sijhawm qhib thiab khaws cia dej txuas ntxiv ua rau muaj kev kho kom zoo dua qub, txo qhov kev pheej hmoo ntawm cov kab nrib pleb thiab txhim kho lub zog ntawm plaster.
3. Self-Leveling Compounds:
Nyob rau hauv tus kheej-leveling tebchaw, MHEC pab tswj cov flowability thiab sib xws ntawm kev sib tov. Nws lub peev xwm khaws cov dej kom ruaj khov ua kom zoo ib yam thiab tiv thaiv kev teeb tsa sai, uas tuaj yeem ua rau qhov chaw tsis sib xws.
4. Cementitious Grouts:
MHEC txhim kho kev ua haujlwm thiab kev tuav dej hauv cov cementitious grouts, kom ntseeg tau tias lawv sau qhov khoob zoo thiab kho kom raug. Qhov no txo qis shrinkage thiab txhim khu kev ua haujlwm ntev ntawm grout, tshwj xeeb tshaj yog nyob rau hauv cov chaw tsheb loj.
Kev sib tw thiab kev txiav txim siab
1. Kev siv tshuaj kom zoo:
Qhov kev ua tau zoo ntawm MHEC ua tus neeg saib xyuas dej yog nyob ntawm qhov kev noj kom raug. Cov nyiaj ntau dhau tuaj yeem ua rau muaj viscosity ntau dhau, ua rau cov tshuaj khib nyiab tsis yooj yim, thaum cov nyiaj tsis txaus yuav tsis muab cov txiaj ntsig zoo khaws cia. Precise formulation thiab xeem yog tsim nyog los ua kom pom kev ua tau zoo.
2. Environmental Factors:
Ib puag ncig tej yam kev mob xws li kub thiab av noo tuaj yeem cuam tshuam kev ua haujlwm ntawm MHEC hauv mortar. Qhov kub thiab txias tuaj yeem ua kom cov dej ntws tawm sai dua, xav tau ntau dua ntawm MHEC kom muaj peev xwm ua haujlwm. Hloov pauv, cov av noo siab tuaj yeem txo qhov xav tau ntawm cov dej tuav cov neeg ua haujlwm.
3. Kev txiav txim siab nqi:
High-purity MHEC tuaj yeem raug nqi ntau dua li cov khoom siv uas tsis huv los yog lwm cov dej tuav pov hwm. Txawm li cas los xij, nws qhov kev ua tau zoo tshaj plaws thiab cov txiaj ntsig uas nws muab rau hauv cov nqe lus ntawm kev ua haujlwm, lub zog, thiab kev ua haujlwm ntev tuaj yeem ua pov thawj tus nqi siab dua hauv ntau daim ntawv thov.
High-purity MHEC yog ib qho tseem ceeb nyob rau hauv mortar formulations vim nws tshwj xeeb cov dej-retaining zog. Los ntawm kev tsim ib lub network zoo li gel, txo cov capillary kev ua, thiab txhim kho kev sib koom ua ke, MHEC txhim kho kev ua haujlwm, ua haujlwm ntev, thiab kev ua haujlwm tag nrho ntawm mortars. Nws cov txiaj ntsig tau tshwm sim nyob rau hauv ntau daim ntawv thov, los ntawm cov pobzeb nplaum mus rau tus kheej-leveling compounds. Txawm hais tias muaj kev sib tw xws li kev siv tshuaj kom zoo thiab kev txiav txim siab tus nqi, qhov zoo ntawm kev siv lub siab huv MHEC ua rau nws yog qhov kev xaiv zoo tshaj plaws rau kev ua tiav cov txiaj ntsig zoo mortar.
Rau plaster thiab render daim ntaub ntawv,
Post lub sij hawm: Jun-15-2024