Cov khoom siv cement, xws li pob zeb, mortar, thiab lwm yam khoom siv hauv tsev, tau siv dav hauv cov tsev niaj hnub. Cellulose ethers (xws li hydroxypropyl methylcellulose (HPMC), hydroxyethyl methylcellulose (HEMC), thiab lwm yam) yog cov khoom tseem ceeb uas tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom cement. Txhawm rau ua tiav cov khoom zoo no, nws yog ib qho tseem ceeb rau tus tswv thiab tswj kev ua haujlwm ntawm cellulose ethers.
1. Cov khoom tseem ceeb thiab kev ua haujlwm ntawm cellulose ethers
Cellulose ethers yog ib chav kawm ntawm cov tshuaj derivatives ntawm natural cellulose, nyob rau hauv uas pawg hydroxyl yog ib feem hloov los ntawm ib pawg ether los ntawm ib tug etherification cov tshuaj tiv thaiv. Ntau hom cellulose ethers tuaj yeem sib xyaw ua ke raws li hom thiab tus lej ntawm cov khoom hloov pauv, thiab txhua hom muaj lub luag haujlwm sib txawv hauv cov khoom cement.
Viscosity ntawm cellulose ethers:
Lub viscosity ntawm cellulose ethers ncaj qha cuam tshuam rau rheology thiab stability ntawm cement paste. High-viscosity cellulose ethers tuaj yeem txhim kho cov dej tuav thiab kev sib khi lub zog ntawm cov muab tshuaj txhuam, tab sis tuaj yeem txo nws cov dej ntws. Tsawg-viscosity cellulose ethers pab txhim kho kev ua haujlwm thiab fluidity.
Degree ntawm kev hloov pauv (DS) thiab molar hloov pauv (MS):
Qib ntawm kev hloov pauv thiab molar hloov pauv ntawm cellulose ethers txiav txim siab nws cov solubility thiab viscosity ntawm cov tshuaj. Qib siab ntawm kev hloov pauv thiab kev hloov molar siab feem ntau tuaj yeem txhim kho cov dej tuav thiab ruaj khov ntawm cellulose ethers.
Solubility ntawm cellulose ethers:
Tus nqi dissolution thiab solubility ntawm cellulose ethers cuam tshuam rau uniformity ntawm cement paste. Cellulose ethers nrog zoo solubility tuaj yeem tsim ib qho kev daws teeb meem sai dua, yog li ua kom muaj qhov sib xws thiab ruaj khov ntawm cov muab tshuaj txhuam.
2. Xaiv cov cellulose ethers uas tsim nyog
Cov xwm txheej sib txawv muaj cov kev ua tau zoo sib txawv rau cov cellulose ethers. Xaiv hom thiab specification ntawm cellulose ether tuaj yeem txhim kho kev ua tau zoo ntawm cov khoom cement:
Binders:
Hauv cov ntawv thov xws li pobzeb nplaum thiab plaster mortars, high-viscosity cellulose ethers (xws li HPMC) tuaj yeem muab kev ua kom zoo dua qub thiab ua kom ntub dej ntev, yog li txhim kho kev tsim kho thiab kev sib txuas zaum kawg.
Cov khoom siv dej ruaj khov:
Nyob rau hauv tus kheej-leveling mortars thiab cement-based tile adhesives, cellulose ethers nrog dej tuav siab (xws li HEMC) yuav tsum tau. Kev tuav dej siab pab tiv thaiv kom tsis txhob poob dej ntxov ntxov, yog li ua kom muaj dej txaus txaus thiab lub sijhawm ua haujlwm ntev dua.
Cov khoom siv txhawb zog:
Cellulose ethers siv los txhim kho lub zog ntawm cov khoom cement yuav tsum muaj qhov zoo dispersibility thiab nruab nrab viscosity los txhim kho cov uniformity thiab lub zog ntawm matrix.
3. Txhim kho txoj kev sib ntxiv
Kev tswj cov txheej txheem ntxiv ntawm cellulose ether hauv cov khoom siv cement yog qhov tseem ceeb kom ua kom nws cov txiaj ntsig zoo. Cov hauv qab no yog ob peb txoj hauv kev optimization:
Txoj kev premixing:
Sib tov cellulose ether nrog lwm cov hmoov qhuav qhuav ua ntej. Txoj kev no tuaj yeem zam qhov tsim ntawm agglomeration ntawm cellulose ether tom qab kev sib cuag ncaj qha nrog dej, yog li ua kom nws zoo li dispersion hauv slurry.
Kev sib xyaw ntub dej:
Ntxiv cellulose ether rau cement slurry maj mam. Txoj kev no tsim nyog rau qhov xwm txheej uas cellulose ether yaj sai sai thiab pab tsim kom muaj kev ncua ruaj khov.
Segmented ntxiv txoj kev:
Nyob rau hauv tus txheej txheem ntawm kev npaj cov cement slurry, ntxiv cellulose ether nyob rau hauv ntu tuaj yeem ua kom nws cov khoom sib txawv thoob plaws hauv cov txheej txheem npaj thiab txo cov agglomeration.
4. Tswj lwm yam
Lwm yam xws li kub, pH tus nqi, thiab tus nqi nplawm muaj qhov cuam tshuam loj rau kev ua haujlwm ntawm cellulose ether.
Kev tswj qhov kub thiab txias:
Solubility thiab viscosity ntawm cellulose ether yog heev rhiab heev rau kub. Kev kub siab dua pab cellulose ether kom yaj sai, tab sis kuj yuav ua rau cov viscosity ntawm cov tshuaj txo. Qhov kub thiab txias yuav tsum tau hloov kho raws li qhov tshwj xeeb daim ntawv thov scenario kom ntseeg tau tias kev ua haujlwm zoo thiab ua haujlwm tau zoo.
Kev hloov pH: Tus nqi pH ntawm cov cement paste feem ntau yog nyob rau hauv siab alkaline ntau, thaum solubility thiab viscosity ntawm cellulose ether hloov pauv nrog kev hloov pauv ntawm pH tus nqi. Kev tswj hwm tus nqi pH hauv qhov tsim nyog tuaj yeem ua kom ruaj khov ntawm kev ua haujlwm ntawm cellulose ether.
Stirring rate: Tus nqi nplawm cuam tshuam rau cov nyhuv dispersion ntawm cellulose ether hauv cement paste. Kev nplawm ntau dhau tuaj yeem ua rau huab cua qhia thiab sib sau ua ke ntawm cellulose ether, thaum nruab nrab stirring tus nqi pab kom tusyees faib thiab yaj cellulose ether.
5. Kev txheeb xyuas cov ntaub ntawv thiab cov tswv yim tsim nyog
Los ntawm kev txheeb xyuas cov ntaub ntawv tiag tiag, peb tuaj yeem nkag siab ntxiv txog daim ntawv thov thiab kev ua kom zoo ntawm cellulose ether hauv cov khoom cement sib txawv:
High-performance pobzeb nplaum nplaum: Thaum ib lub tuam txhab tau tsim cov nplais nplaum nplaum ua haujlwm siab, nws tau pom tias cov dej tuav ntawm cov khoom qub tsis txaus, uas ua rau muaj kev sib txuas ntawm lub zog tom qab kev tsim kho. Los ntawm kev qhia cov dej-retaining HEMC thiab kho nws cov nyiaj ntxiv thiab ntxiv txoj kev (siv txoj kev premixing), cov dej tuav thiab kev sib txuas lub zog ntawm cov nplais nplaum tau ua tiav zoo dua.
Cov khoom siv hauv pem teb tus kheej: Cov khoom siv hauv pem teb ntawm tus kheej siv hauv ib qhov project muaj cov dej tsis zoo thiab tsis zoo ntawm qhov chaw tom qab kev tsim kho. Los ntawm kev xaiv cov viscosity tsawg HPMC thiab optimizing tus nqi stirring thiab kub tswj, lub fluidity thiab kev tsim kho ntawm slurry yog zoo dua, ua rau lub kawg pem teb nto smoother.
Tswj kev ua haujlwm ntawm cellulose ether hauv cov khoom cement yog tus yuam sij rau kev txhim kho cov khoom siv thiab kev tsim kho kom zoo. Los ntawm kev xaiv hom cellulose ether, optimizing txoj kev sib ntxiv, thiab tswj cov kev cuam tshuam sab nraud, cov khoom tseem ceeb ntawm cov khoom cement xws li dej tuav, adhesion, thiab fluidity tuaj yeem txhim kho tau zoo. Hauv kev siv cov tswv yim, nws yog ib qho tsim nyog yuav tsum tau ua kom zoo dua qub thiab kho kev siv cellulose ether raws li cov kev xav tau tshwj xeeb thiab daim ntawv thov scenarios kom ua tiav cov txiaj ntsig zoo tshaj plaws.
Post lub sij hawm: Jun-26-2024