Hauv cov txheej txheem tsim kho niaj hnub no,methyl hydroxyethyl cellulose (MHEC)tau dhau los ua ib qho khoom siv ntxiv uas tseem ceeb heev. Ua ib qho cellulose ether uas tau hloov kho, MHEC siv dav hauv cov mortars, putties, coatings, tile adhesives, self-leveling compounds, thiab cement-based waterproof coatings vim nws cov khoom zoo heev uas ua rau tuab, khaws dej, ruaj khov, thiab ua haujlwm tau zoo. Thaum cov khoom siv hauv tsev txuas ntxiv mus rau kev ua haujlwm siab, kev phooj ywg ib puag ncig, thiab yooj yim siv, lub luag haujlwm ntawm MHEC tau dhau los ua qhov tseem ceeb dua.
1. Cov Yam Ntxwv Tseem Ceeb ntawm MHEC
MHEC yog ib qho polymer uas tsis yog ionic, yaj tau hauv dej ua los ntawm cov cellulose ntuj los ntawm kev hloov pauv methylation thiab hydroxyethylation. Nws cov qauv molecular muaj ob qho tib si hydrophobic methoxy pawg thiab hydrophilic hydroxyethyl pawg, ua rau nws yaj tau zoo heev, rheological zog, thiab zaj duab xis zog. MHEC yaj sai sai hauv dej los ua ib qho kua pob tshab, muab viscosity thiab thixotropy rau lub cev.
MHEC ruaj khov rau cov kua qaub thiab alkalis, tiv taus ntsev zoo, sib haum xeeb zoo nrog lwm cov khoom ntxiv, thiab tsis yooj yim cuam tshuam los ntawm cov ions hauv lub cev. Cov khoom siv tshuaj lom neeg ruaj khov no yog lub hauv paus rau nws txoj kev saib xyuas kev ua haujlwm ntev hauv cov kab ke tsim kho.
2. Lub Luag Haujlwm Tseem Ceeb ntawm MHEC hauv Cov Khoom Siv Hauv Tsev
2.1. Kev Ua Haujlwm Zoo Tshaj Plaws ntawm Kev Khaws Dej
Thaum lub sijhawm siv cov tshuaj mortar, putties, cov nplaum pobzeb, thiab lwm yam khoom siv, cov dej noo yooj yim nqus los ntawm cov substrate lossis huab cua, ua rau cov dej poob ua ntej lub sijhawm thiab cuam tshuam rau cov tshuaj cement hydration thiab lub zog sib txuas. MHEC tuaj yeem tsim "zaj duab xis khaws dej" hauv lub kaw lus, ncua cov dej evaporation thiab xyuas kom meej tias cov khoom siv hydration txaus, yog li txhim kho lub sijhawm tsim kho, kev sib txuas, thiab lub zog kawg.
2.2. Kev Tswj Xyuas Kom Tuab Thiab Rheology Zoo Kawg Nkaus
MHEC muaj peev xwm ua kom tuab thiab kho qhov sib xws thiab kev ntws ntawm lub cev mortar. Los ntawm kev tswj qhov ntau thiab tsawg thiab qib kev hloov pauv, ua tau zoo tshaj plaws - yooj yim siv thiab du, tab sis tsis yooj yim poob lossis los ntshav. Tshwj xeeb tshaj yog hauv kev tsim kho ntsug, MHEC txhim kho cov khoom siv tiv thaiv kev poob thiab tiv thaiv kev plam, ua kom ntseeg tau tias kev tsim kho du.
2.3. Kev Ua Haujlwm Zoo Dua thiab Kev Tsim Kho
Cov ntaub ntawv tsim kho niaj hnub tsis yog tsuas yog ua kom muaj kev ua tau zoo xwb tab sis kuj tseem ceeb rau kev tsim kho. MHEC muab cov roj nplua nyeem thiab cov khoom siv zoo heev, txo qhov tsis kam ntawm kev tsim kho thiab txhim kho kev du thiab kev ua haujlwm ntawm cov neeg ua haujlwm. Rau cov kab ke xws li cov nplaum pobzeb thiab cov nplaum uas ua rau nws tus kheej sib npaug, MHEC sib npaug cov khoom ntws thiab cov khoom nplaum, ua rau kev tsim kho yooj yim dua.
2.4. Kev Ruaj Ntseg Khoom Siv Zoo Dua thiab Kev Tiv Thaiv Kev Sib Cais
Hauv cov txheej txheem uas muaj cov khoom khov heev lossis cov txheej txheem ntau theem nyuaj, MHEC tiv thaiv kev sib cais ntawm cov khoom khov thiab cov kua thiab cov khoom me me, tswj kom lub cev sib xws. Nws cov nyhuv colloidal stabilizing txo qhov kev sib cais lossis kev sib sau ua ke thaum lub sijhawm thauj mus los thiab khaws cia, yog li ua rau cov khoom siv lub sijhawm ntev dua.
2.5. Kev sib txuas zoo dua thiab kev tiv thaiv kab nrib pleb
Cov yam ntxwv ntawm MHEC ua rau cov zaj duab xis tsim tau ib lub qauv sib txuas uas yoog tau hauv cov khoom siv tawv, ua rau lub kaw lus ruaj khov thiab tiv taus kev tawg. Nws qhov kev khaws dej zoo heev ua kom ntseeg tau tias cov cement noo tag nrho, tsim cov txheej txheem ntom dua, txhim kho lub zog sib txuas thiab kev ruaj khov.
3. MHEC Tsav Kev Tsim Cov Khoom Siv Ua Vaj Tse Zoo
3.1. Pab txhawb kom muaj qhov sib piv ntawm dej thiab cement qis, cov mortars muaj zog heev
Cov mortars ib txwm feem ntau xav tau qhov sib piv ntawm dej thiab cement siab kom ntseeg tau tias ua haujlwm tau zoo. MHEC, los ntawm kev txhim kho cov khoom rheological, tuaj yeem ua tiav kev ua haujlwm tau zoo nyob rau hauv cov xwm txheej sib piv dej thiab cement qis, yog li txhim kho qhov ceev ntawm mortar thiab kev ruaj khov.
3.2. Kev Hloov Kho Rau Kev Tsim Cov Mortars Qhuav Uas Zoo Rau Ib Puag Ncig
Cov tshuaj mortar qhuav niaj hnub no xav tau kev thauj mus los ruaj khov thiab khaws cia ntev. MHEC lub peev xwm tiv thaiv kev sib sau ua ke thiab tiv thaiv kev sib cais ua tau raws li cov kev xav tau no, ua rau cov khoom sib xyaw qhuav rov qab ua haujlwm tau sai tom qab khaws cia ntev.
3.3. Txhawb Kev Txuag Hluav Taws Xob thiab Lub Tswv Yim Txog Kev Tsim Kho Vaj Tse Ntsuab
MHEC yog los ntawm cov cellulose ntuj, muaj kev nyab xeeb thiab tsis muaj tshuaj lom, lwj tau, thiab ua tau raws li qhov yuav tsum tau ua kom ruaj khov ntawm cov khoom siv hauv tsev uas tsis ua rau ib puag ncig puas tsuaj. Tib lub sijhawm, nws pab txo cov khib nyiab thiab kev siv zog hauv kev tsim kho, ua rau nws yog ib feem tseem ceeb ntawm cov khoom siv hauv tsev ntsuab.
3.4. Cov Ntawv Thov Nthuav Dav Hauv Cov Txheej Txheem Khoom Siv Tshiab
Ntxiv rau cov cement mortars ib txwm muaj, MHEC kuj tseem siv dav hauv cov txheej txheem tshiab xws li gypsum-based, lime-based, thiab polymer-modified mortars. Nws ua haujlwm synergistically nrog lwm cov organic lossis inorganic additives (xws li RDP thiab HPMC) kom ua tiav kev ua haujlwm zoo dua, xws li kev txhim kho elasticity thiab kev tiv thaiv khov-thaw.
MHECtsis yog tsuas yog ib qho khoom ua kom tuab thiab khaws dej xwb, tab sis kuj yog ib qho tseem ceeb rau kev ua kom zoo dua ntawm cov khoom siv niaj hnub no. Nws ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm tau zoo, kev nplaum, kev ruaj khov, thiab kev phooj ywg ib puag ncig. Nws tuaj yeem hais tias qhov ntxiv ntawm MHEC tau coj mus rau lub sijhawm tshiab ntawm kev ua haujlwm siab, kev ruaj khov, thiab kev phooj ywg ib puag ncig rau cov txheej txheem mortar thiab txheej txheem ib txwm muaj.
Lub sijhawm tshaj tawm: Lub Kaum Hli-29-2025