Cellulose ethers yog ib chav kawm tseem ceeb ntawm cov khoom siv ntau yam, uas siv dav hauv kev tsim kho kom txhim kho kev ua haujlwm ntawm cov khoom. Tshwj xeeb tshaj yog nyob rau hauv cov nplaum pobzeb, cellulose ethers tuaj yeem txhim kho lawv cov khoom siv lub cev thiab tshuaj lom neeg, txhim kho kev ua haujlwm ntawm kev tsim kho, thiab txhim kho lub zog thiab kev ruaj khov ntawm kev sib txuas.
1. Cov khoom tseem ceeb ntawm cellulose ethers
Cellulose ethers yog cov khoom siv tau los ntawm kev hloov kho tshuaj ntawm cov cellulose ntuj, thiab cov feem ntau suav nrog methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl cellulose (HEC), thiab lwm yam. Nws cov yam ntxwv tseem ceeb yog tias nws yaj tau hauv dej, tsim cov tshuaj viscosity siab, thiab muaj cov khoom zoo heev rau kev ua kom tuab, khaws dej thiab tsim cov yeeb yaj kiab. Cov yam ntxwv no ua rau cellulose ethers ua lub luag haujlwm tseem ceeb hauv cov nplaum pobzeb.
2. Txhim kho kev khaws dej
2.1 Qhov tseem ceeb ntawm kev khaws dej
Qhov kev khaws dej ntawm cov nplaum pobzeb yog qhov tseem ceeb rau kev ua haujlwm ntawm kev tsim kho thiab lub zog sib txuas. Kev khaws dej zoo tuaj yeem ua kom cov nplaum muaj cov dej noo txaus thaum lub sijhawm kho, yog li ua kom cov cement noo tag nrho. Yog tias qhov kev khaws dej tsis txaus, cov dej yooj yim nqus los ntawm cov khoom siv lossis ib puag ncig, ua rau cov dej tsis txaus, uas cuam tshuam rau lub zog kawg thiab cov nyhuv sib txuas ntawm cov nplaum.
2.2 Cov txheej txheem khaws dej ntawm cellulose ether
Cellulose ether muaj peev xwm khaws dej tau zoo heev thiab tuaj yeem khi ntau cov dej molecule ntawm nws cov saw molecular. Nws cov kua dej viscosity siab tuaj yeem tsim cov dej sib npaug hauv cov nplaum thiab xauv cov dej los ntawm cov capillary kev ua haujlwm hauv cov nplaum network kom tiv thaiv cov dej kom tsis txhob poob sai dhau. Lub tshuab khaws dej no tsis yog tsuas yog ua rau cov tshuaj tiv thaiv hydration ntawm cement, tab sis kuj tuaj yeem ntev lub sijhawm qhib ntawm cov nplaum thiab txhim kho kev ywj pheej ntawm kev tsim kho.
3. Txhim kho kev ua haujlwm ntawm kev tsim kho
3.1 Kev ncua sijhawm qhib
Qhov kev qhia txog cellulose ether ua rau lub sijhawm qhib ntawm cov nplaum pobzeb ntev dua, uas yog, lub sijhawm uas cov nplaum tseem nplaum tom qab siv rau ntawm qhov chaw ntawm cov khoom siv. Qhov no muab sijhawm ntau rau cov neeg ua haujlwm tsim kho los kho thiab tso cov pobzeb, yog li txo cov teeb meem kev tsim kho uas tshwm sim los ntawm lub sijhawm.
3.2 Kev ua tau zoo dua qub tiv thaiv kev sagging
Thaum lub sijhawm tsim kho, cov nplaum yuav sag vim lub ntiajteb txawj nqus tom qab cov vuas raug tso, tshwj xeeb tshaj yog thaum siv rau ntawm cov chaw ntsug. Qhov cuam tshuam ntawm cellulose ether ua rau tuab tuaj yeem txhim kho cov khoom tiv thaiv kev sag ntawm cov nplaum, kom ntseeg tau tias nws tsis swb thaum lo rau cov vuas. Cov yam ntxwv no yog qhov tseem ceeb tshwj xeeb rau kev ua kom raug thiab kev zoo nkauj ntawm kev tso vuas.
3.3 Txhim kho lubricity thiab operability
Qhov lubricity ntawm cellulose ether ua rau cov nplaum pobzeb ua haujlwm tau zoo dua, ua rau lawv yooj yim dua rau kev thov thiab tiaj tus. Cov yam ntxwv no pab txo qhov nyuaj thiab lub sijhawm ntawm kev tsim kho thiab txhim kho kev ua haujlwm zoo.
4. Txhim kho lub zog ntawm kev sib txuas
4.1 Txhim kho qhov kev sib txuas thawj zaug
Cov kua nplaum siab uas tsim los ntawm cellulose ether hauv cov kua dej tuaj yeem ua rau kom cov nplaum pib lo rau ntawm cov vuas, muab kev nplaum tam sim ntawd thaum tso cov vuas thiab zam kev swb lossis kev txav ntawm cov vuas.
4.2 Txhawb kom cov cement hydration
Qhov kev ua tau zoo ntawm cov cellulose ether ua kom muaj kev ua haujlwm ntawm cov cement hydration tag nrho, yog li tsim cov khoom hydration ntau dua (xws li hydrated calcium silicate), uas ua rau lub zog sib txuas ntawm cov nplaum zoo dua. Cov txheej txheem no tsis yog tsuas yog txhim kho lub zog kho tshuab ntawm cov nplaum xwb, tab sis kuj txhim kho nws lub zog thiab kev tiv thaiv tawg.
5. Txhim kho kev ruaj khov thiab kev tawg tsis kam
5.1 Txhim kho kev tiv thaiv khov-thaw
Cov cellulose ethers txhim kho qhov kev tiv thaiv khov-yaj ntawm cov nplaum pobzeb los ntawm kev txhim kho qhov khaws dej thiab qhov sib xyaw ntawm cov nplaum pobzeb, txo qhov kev hloov pauv sai thiab kev poob dej. Qhov kev txhim kho no tso cai rau cov nplaum kom tswj tau qhov ua tau zoo txawm tias nyob rau hauv qhov chaw txias heev thiab tsis tshua muaj kev tawg lossis tawg.
5.2 Txhim kho kev tiv thaiv kab nrib pleb
Thaum lub sijhawm kho cov nplaum, cov qauv sib txuas ua ke uas tsim los ntawm cellulose ethers pab qeeb qeeb qhov kev ntswj ntawm cov cement thiab txo qhov kev pheej hmoo ntawm kev tawg los ntawm kev ntxhov siab ntswj. Tsis tas li ntawd, qhov cuam tshuam ntawm cellulose ethers ua rau cov nplaum kom zoo dua qhov sib txawv ntawm cov pobzeb thiab cov substrate, ntxiv txhim kho qhov ruaj khov ntawm qhov sib txuas.
6. Lwm yam haujlwm
6.1 Muab cov khoom lubrication thiab tiv thaiv kev sagging
Lubrication ntawm cellulose ethers tsis yog tsuas yog pab txhawb kev ua haujlwm xwb, tab sis kuj txo qhov tshwm sim ntawm cov nplaum thaum lub sijhawm thov, ua kom muaj kev sib xws thiab ruaj khov thaum lub sijhawm thov.
6.2 Kev yooj yim dua ntawm kev tsim kho
Los ntawm kev ua kom cov nplaum nplaum thiab lub sijhawm tsim kho ntau ntxiv, cellulose ether txhim kho qhov yooj yim ntawm kev tsim kho, tso cai rau cov neeg ua haujlwm tsim kho kom kho qhov chaw ntawm cov vuas yooj yim dua, txo cov qhov tsis zoo ntawm kev tsim kho thiab cov nqi rov ua haujlwm.
7. Piv txwv ntawm kev siv Cellulose Ether
Hauv cov ntawv thov tshwj xeeb, cellulose ether txhim kho qhov zoo ntawm tag nrho cov phiaj xwm los ntawm kev txhim kho kev ua tau zoo ntawm cov nplaum pobzeb. Piv txwv li, nyob rau hauv qee qhov kub siab lossis qis av noo, cov nplaum ib txwm yuav ntsib teeb meem ntawm kev poob dej sai, ua rau muaj teeb meem kev tsim kho thiab tsis muaj zog txaus. Tom qab ntxiv cellulose ether, cov nplaum tuaj yeem khaws cia dej zoo, zam cov teeb meem no, thiab yog li ua kom ntseeg tau qhov zoo ntawm qhov project.
Cellulose ether ua rau cov nplaum pobzeb zoo dua qub los ntawm nws txoj kev khaws dej zoo heev, ua kom tuab thiab ua kom lubricity. Nws tsis tsuas yog txhim kho kev ua haujlwm ntawm kev tsim kho, lub zog sib txuas thiab lub zog ntawm cov nplaum, tab sis kuj txhim kho qhov yooj yim thiab kev ntseeg siab ntawm kev tsim kho. Cov kev txhim kho no tsis yog tsuas yog txhim kho qhov zoo ntawm qhov project xwb, tab sis kuj muab kev ywj pheej thiab kev ruaj khov rau cov txheej txheem tsim kho. Yog li ntawd, ua ib qho tseem ceeb ntxiv, kev siv cellulose ether hauv cov nplaum pobzeb muaj txiaj ntsig zoo thiab kev cia siab dav.
Lub sijhawm tshaj tawm: Lub Rau Hli-24-2024