Cellulose ether, tseem hu ua methylcellulose / hydroxypropylmethylcellulose (HPMC / MHEC), yog cov dej-soluble polymer dav siv hauv kev tsim kho. Nws muaj ob peb yam tseem ceeb uas ua rau nws yog ib qho tseem ceeb raw khoom rau mortar thiab cement. Cov khoom tshwj xeeb ntawm cellulose ethers muaj xws li dej tuav, zoo adhesion, thiab muaj peev xwm ua raws li cov thickeners.
Cellulose ethers ua rau kom muaj zog ntawm cov tshuaj khib nyiab los ntawm kev muab kev yooj yim thiab elasticity rau cov tshuaj khib sib tov. Raws li qhov tshwm sim, cov khoom siv tau yooj yim ua haujlwm nrog thiab cov khoom kawg yog qhov ruaj khov dua. Kab lus no yuav tshuaj xyuas seb cov cellulose ethers (HPMC/MHEC) cuam tshuam li cas rau lub zog ntawm mortars.
Cov nyhuv ntawm cellulose ether ntawm mortar
Cellulose ethers yog cov khoom xyaw tseem ceeb hauv ntau cov ntaub ntawv tsim kho, suav nrog mortar thiab cement. Thaum siv hauv mortar, cellulose ether ua raws li kev khi, pab txhawm rau txhawm rau sib xyaw ua ke thiab txhim kho cov khoom ua haujlwm ntawm cov khoom. Cov dej tuav cov khoom ntawm cellulose ethers muab cov xwm txheej zoo rau kev kho kom zoo ntawm mortars thiab cements, thaum zoo adhesion pab tsim kev sib raug zoo ntawm cov khoom sib txawv.
Mortar yog ib qho khoom siv tseem ceeb hauv tsev siv los nplaum cib lossis blocks ua ke. Qhov zoo ntawm daim ntawv cog lus cuam tshuam rau lub zog thiab kav ntev ntawm cov qauv. Tsis tas li ntawd, daim ntawv cog lus lub zog yog ib qho cuab yeej tseem ceeb los xyuas kom meej tias cov qauv tuaj yeem tiv taus txhua yam uas nws raug. Lub zog ntawm cov tshuaj khib nyiab yog qhov tseem ceeb heev vim tias cov qauv nyob rau hauv ib qho kev ntxhov siab lossis kev thauj khoom nyob ntawm qhov zoo ntawm daim ntawv cog lus. Yog tias lub zog ntawm daim ntawv cog lus tsis txaus, cov qauv yuav ua rau muaj teeb meem loj xws li tawg lossis tsis ua haujlwm, ua rau muaj kev sib tsoo uas tsis tau pom dua, nce nqi txij nkawm thiab kev nyab xeeb.
Mechanism ntawm kev ua ntawm cellulose ethers
Cellulose ether yog dej-soluble polymer siv los txhim kho cov khoom ntawm mortar. Kev ua haujlwm ntawm cellulose ether nyob rau hauv mortar yog dispersion ntawm additives, uas yog tsuas yog haum rau dej-soluble polymers, thiab txhim khu lub zog ntawm cov ntaub ntawv los ntawm kev txo qhov nro ntawm cov ntaub ntawv. Qhov no txhais tau hais tias thaum cellulose ether ntxiv rau hauv mortar, nws yog sib npaug zos thoob plaws hauv qhov sib tov, tiv thaiv kev tsim cov pob uas tuaj yeem ua rau cov pob txha tsis muaj zog hauv cov tshuaj khib nyiab.
Cellulose ether kuj ua raws li ib tug thickening neeg sawv cev nyob rau hauv lub mortar, tsim ib tug ntau viscous sib tov uas tso cai rau nws mus rau ib tug ruaj khov rau lub cib los yog thaiv nws yog siv rau. Tsis tas li ntawd, nws txhim kho cov huab cua ntim thiab txhim kho kev ua haujlwm ntawm cov mortar kom muaj txiaj ntsig zoo dua thiab siv tau yooj yim dua. Cov cellulose ethers ntxiv rau hauv mortar qeeb tus nqi uas cov dej hauv qhov sib tov evaporates, ua rau cov mortar yooj yim dua rau kev thov thiab sib txuas cov khoom ua ke ntau zog.
Qhov zoo ntawm cellulose ether ntawm mortar
Qhov sib ntxiv ntawm cellulose ethers (HPMC / MHEC) rau mortars muaj ntau yam txiaj ntsig suav nrog kev txhim kho daim ntawv cog lus. Cov ntawv cog lus siab zog ua rau kom lub sij hawm ntev ntawm cov qauv, tsis txhob raug nqi kho.
Cellulose ethers kuj tseem qhia txog kev ua haujlwm zoo dua rau cov tshuaj khib nyiab, ua kom yooj yim rau kev tsim thiab txo lub sijhawm xav tau rau kev siv zog siv zog. Qhov kev txhim kho kev ua haujlwm no pab ua kom nrawm thiab ua haujlwm tau zoo, yog li ua kom muaj txiaj ntsig zoo hauv kev tsim kho kev lag luam.
Cellulose ether kuj tseem tuaj yeem txhim kho cov dej khaws cia ntawm cov tshuaj khib thiab ua kom lub sijhawm txaus rau kev kho kom ruaj khov. Qhov no txhim kho kev sib raug zoo ntawm cov ntaub ntawv siv hauv kev tsim kho, ua rau cov qauv ruaj khov dua.
Cellulose ether additive mortars yooj yim dua los ntxuav, thiab tshem tawm cov khoom ntau dhau ntawm lub tsev tiav tsis yog qhov nyuaj. Kev ua kom adhesion ntawm cov mortar rau cov khoom siv hauv tsev txhais tau tias tsis muaj pov tseg vim tias cov khoom sib xyaw yuav tsis flake tawm lossis loosen los ntawm cov qauv thaum lub sij hawm sib npaug.
nyob rau hauv xaus
Qhov sib ntxiv ntawm cellulose ethers (HPMC / MHEC) rau mortars plays lub luag haujlwm tseem ceeb hauv kev txhim kho lub zog ntawm mortars rau kev tsim kho. Cellulose ethers muab dej tuav, txhim kho kev ua haujlwm ntawm cov tshuaj khib nyiab, thiab tso cai rau qeeb qeeb ntawm evaporation rau cov khoom sib txuas zoo dua. Ua kom muaj zog daim ntawv cog lus ua kom lub zog ruaj khov ntawm cov qauv, txo cov teeb meem kev saib xyuas tsis tau pom dua, txhim kho kev nyab xeeb thiab txo cov nqi tsim kho. Xav txog tag nrho cov txiaj ntsig no, nws yog qhov tseeb tias kev siv cellulose ethers yuav tsum tau siv dav hauv kev tsim kho kev lag luam kom zoo dua qub thiab ruaj khov kev tsim kho.
Post lub sij hawm: Sep-01-2023