Raws li kev lag luam kev tsim kho thiab kev pleev xim txuas ntxiv mus, qhov kev thov rau cov khoom siv ua haujlwm siab uas txhim kho cov khoom zoo, kev siv tau zoo, thiab kev ruaj khov tau loj hlob ntau heev. Ntawm cov khoom siv ntxiv no,Methyl Hydroxyethyl Cellulose (MHEC)tau dhau los ua ib qho ntawm cov cellulose ethers tseem ceeb tshaj plaws uas siv rau hauv cov mortars qhuav, cov nplaum pobzeb, cov putty phab ntsa, cov khoom gypsum, thiab cov xim pleev dej.
MHEC muaj nqis rau nws txoj kev khaws dej zoo heev, muaj peev xwm ua kom tuab, txhim kho kev ua haujlwm, thiab tswj kev sib txhuam. Nws pab cov chaw tsim khoom tsim cov ntaub ntawv siv hauv kev tsim kho thiab cov txheej txheem uas ua tau raws li cov qauv kev ua tau zoo uas xav tau ntau ntxiv thaum txhim kho cov yam ntxwv ntawm kev siv rau cov neeg cog khoom thiab cov neeg siv kawg.
Tsab xov xwm no tshawb nrhiav seb MHEC yog dab tsi, nws tsim li cas, nws cov yam ntxwv tseem ceeb, thiab vim li cas nws thiaj ua lub luag haujlwm tseem ceeb hauv cov tshuaj mortar thiab xim pleev xim niaj hnub no.
Kev Nkag Siab Txog MHEC
MHEC Yog Dab Tsi?
Methyl Hydroxyethyl Cellulose (MHEC) yog cov cellulose ether uas tsis yog ionic uas tau los ntawm cov cellulose ntuj, feem ntau tau los ntawm cov paj rwb ua kom zoo lossis cov ntoo pulp.
Los ntawm kev tswj hwm etherification txheej txheem, cellulose yog hloov kho los ntawm kev qhia txog:
- Cov pab pawg Methyl
- Cov pab pawg Hydroxyethyl
Cov kev hloov kho no hloov cov cellulose uas tsis yaj tau mus rau hauv cov polymer uas yaj tau hauv dej nrog cov khoom ua kom tuab thiab khaws dej tau zoo heev.
MHEC koom nrog tib tsev neeg li:
- Hydroxypropyl Methyl Cellulose (HPMC)
- Hydroxyethyl Cellulose (HEC)
- Methyl Cellulose (MC)
- Carboxymethyl Cellulose (CMC)
Ntawm cov cellulose ethers no, MHEC nrov tshwj xeeb hauv kev siv hauv kev tsim kho vim nws khaws dej tau zoo thiab sib xws zoo nrog cov cement thiab gypsum systems.
Cov Qauv Tshuaj ntawm MHEC
Cov cellulose backbone muaj cov repeating anhydroglucose units.
Thaum lub sijhawm tsim khoom:
- Qee cov pab pawg hydroxyl raug hloov los ntawm cov pab pawg methyl.
- Qee cov pab pawg hydroxyl raug hloov los ntawm cov pab pawg hydroxyethyl.
Qhov kev hloov kho no muab:
- Kev yaj dej zoo dua
- Kev ruaj khov thermal zoo dua
- Kev ua kom tuab zoo dua
- Kev ua haujlwm zoo tshaj plaws
Qhov degree ntawm kev hloov pauv feem ntau txiav txim siab qhov ua tau zoo ntawm cov khoom thiab kev siv tau zoo.
Cov Txheej Txheem Tsim Khoom ntawm MHEC
Kauj Ruam 1: Kev Npaj Cellulose
Cov cellulose ntshiab los ntawm paj rwb lossis ntoo pulp raug xaiv thiab ua kom zoo.
Kauj Ruam 2: Kev Ua Alkali
Cov cellulose raug kho nrog sodium hydroxide los qhib cov chaw ua haujlwm.
Kauj Ruam 3: Etherification
Cov cellulose activated reacts nrog:
- Methyl chloride
- Ethylene oxide
Qhov no qhia txog cov pab pawg methyl thiab hydroxyethyl rau hauv cov qauv molecular.
Kauj Ruam 4: Kev Ua Kom Tsis Muaj Kev Cuam Tshuam
Cov alkali ntau dhau yog neutralized.
Kauj Ruam 5: Ntxuav thiab Ua Kom Huv Si
Cov tshuaj lom neeg thiab cov tshuaj seem raug tshem tawm.
Kauj Ruam 6: Kev Qhuav thiab Kev Sib Tsoo
Cov khoom purified raug ziab thiab milled ua hmoov zoo rau kev siv hauv kev lag luam.
Cov Khoom Tseem Ceeb ntawm MHEC
Kev Khaws Dej Zoo Kawg Nkaus
Ib qho ntawm MHEC cov khoom muaj nqis tshaj plaws yog nws lub peev xwm khaws dej hauv cov kab ke ua los ntawm cement.
Cov txiaj ntsig suav nrog:
- Kev ua kom cov cement noo zoo dua
- Kev txhim kho lub zog ntxiv
- Txo qhov tawg
- Lub sijhawm qhib ntev dua
Cov nyhuv tuab
MHEC ua rau kom viscosity nce ntxiv thiab muab cov khoom rheological ruaj khov.
Qhov no pab tau:
- Tiv thaiv kev sib cais
- Txhim kho qhov sib xws
- Txhim kho cov yam ntxwv ntawm daim ntawv thov
Kev Txhim Kho Kev Ua Haujlwm
MHEC tsim cov qauv mortar du thiab creamy uas yooj yim dua rau kev siv.
Cov txiaj ntsig suav nrog:
- Txo kev siv zog ua haujlwm
- Kev ua haujlwm zoo dua ntawm kev siv troweling
- Kev ua tiav ntawm qhov chaw zoo dua
Kev Tsim Yeeb Yam
MHEC pab txhawb rau kev tsim cov zaj duab xis tiv thaiv uas txhim kho kev ua haujlwm ntawm cov txheej txheem.
Kev Ruaj Ntseg
Cov tshuaj MHEC tseem ruaj khov nyob rau hauv ntau qhov kub thiab pH.
Vim li cas MHEC thiaj tseem ceeb hauv cov qauv mortar
Cov mortars qhuav niaj hnub xav tau cov yam ntxwv ua tau zoo.
MHEC pab ua tiav cov hom phiaj no.
MHEC hauv Cov Nplaum Pobzeb
Cov nplaum rau pobzeb yog cov kev siv loj tshaj plaws rau MHEC.
Kev Khaws Dej
MHEC tiv thaiv kev poob dej sai sai rau hauv:
- Pob zeb ua vaj tse
- Cov laug cam cement
- Cov nto masonry
Qhov no ua kom cov cement hydration tiav.
Lub Sijhawm Qhib Ntxiv
Cov neeg teeb tsa tau ntau lub sijhawm los teeb tsa cov vuas.
Cov txiaj ntsig suav nrog:
- Kev sib dhos pobzeb zoo dua
- Txo cov khib nyiab
- Txhim kho qhov zoo ntawm kev teeb tsa
Kev Txhim Kho Kev Sib Txuas
MHEC txhawb kom muaj kev sib raug zoo ntawm:
- Cov nplaum rau pobzeb
- Pobzeb nto
- Cov khoom siv hauv qab
Kev Ua Haujlwm Tiv Thaiv Kev Qaug Zog
Rau cov ntawv thov vuas phab ntsa, MHEC txhim kho kev tiv thaiv kev plam.
Cov vuas tseem nyob ruaj khov tom qab kev teeb tsa.
MHEC hauv Phab Ntsa Putty
Phab ntsa putty xav tau kev du thiab sib xws zoo heev.
MHEC muab cov hauv qab no:
- Yooj yim kis tau
- Kev khaws dej kom zoo dua
- Cov khoom xuab zeb zoo dua
- Kev tiv thaiv tawg
- Kev sib txuas zoo dua
Yog li ntawd, cov nplaim ua du thiab ruaj khov dua.
Lub sijhawm tshaj tawm: Lub Rau Hli-18-2026