Cellulose ether, tseem hu ua methylcellulose/hydroxypropylmethylcellulose (HPMC/MHEC), yog cov polymer uas yaj tau hauv dej uas siv dav hauv kev siv hauv kev tsim kho. Nws muaj ntau yam khoom tseem ceeb uas ua rau nws yog cov khoom siv tseem ceeb rau kev tsim cov mortar thiab cement. Cov khoom tshwj xeeb ntawm cellulose ethers suav nrog kev khaws cia dej, kev nplaum zoo, thiab lub peev xwm ua cov khoom ua kom tuab.
Cov cellulose ethers ua rau lub zog sib txuas ntawm cov mortar nce ntxiv los ntawm kev muab kev ywj pheej thiab elasticity rau cov mortar sib tov. Yog li ntawd, cov khoom siv yooj yim dua rau kev ua haujlwm nrog thiab cov khoom kawg ruaj khov dua. Tsab xov xwm no yuav tshuaj xyuas seb cellulose ethers (HPMC / MHEC) cuam tshuam li cas rau lub zog sib txuas ntawm cov mortars.
Cov nyhuv ntawm cellulose ether rau ntawm mortar
Cov cellulose ethers yog cov khoom xyaw tseem ceeb hauv ntau cov ntaub ntawv siv hauv kev tsim kho, suav nrog cov mortar thiab cement. Thaum siv rau hauv mortar, cellulose ether ua haujlwm ua tus binder, pab khi cov khoom sib xyaw ua ke thiab txhim kho kev ua haujlwm ntawm cov khoom. Cov khoom siv khaws dej ntawm cellulose ethers muab cov xwm txheej zoo tshaj plaws rau kev kho kom zoo ntawm cov mortars thiab cements, thaum qhov kev nplaum zoo pab tsim kom muaj kev sib txuas zoo ntawm cov khoom sib txawv.
Cov av nplaum yog ib yam khoom siv tseem ceeb hauv kev tsim kho uas siv los nplaum cov cib lossis cov blocks ua ke. Qhov zoo ntawm cov ntawv sib txuas cuam tshuam rau lub zog thiab kev ruaj khov ntawm lub tsev. Tsis tas li ntawd, lub zog sib txuas yog ib qho tseem ceeb uas ua kom lub tsev tuaj yeem tiv taus txhua yam xwm txheej uas nws raug. Lub zog sib txuas ntawm cov av nplaum yog qhov tseem ceeb heev vim tias lub tsev nyob rau hauv txhua qhov kev ntxhov siab lossis kev thauj khoom nyob ntawm qhov zoo ntawm cov av nplaum. Yog tias lub zog sib txuas tsis txaus, lub tsev yuav muaj teeb meem loj xws li tawg lossis ua tsis tiav, ua rau muaj xwm txheej tsis tau xav txog, nce nqi kho thiab kev phom sij rau kev nyab xeeb.
Lub mechanism ntawm kev ua haujlwm ntawm cellulose ethers
Cellulose ether yog ib qho polymer uas yaj tau hauv dej uas siv los txhim kho cov yam ntxwv ntawm cov mortar. Lub tshuab ua haujlwm ntawm cellulose ether hauv mortar yog kev sib kis ntawm cov khoom ntxiv, uas feem ntau yog tsim rau cov polymers uas yaj tau hauv dej, thiab ua kom lub zog ntawm cov ntaub ntawv muaj zog los ntawm kev txo qhov nro ntawm cov ntaub ntawv. Qhov no txhais tau tias thaum ntxiv cellulose ether rau hauv mortar, nws yuav sib npaug thoob plaws hauv qhov sib tov, tiv thaiv kev tsim cov pob uas tuaj yeem ua rau muaj qhov tsis muaj zog hauv cov mortar.
Cellulose ether kuj ua haujlwm ua tus neeg sawv cev tuab hauv cov mortar, tsim cov khoom sib xyaw ua kom tuab dua uas ua rau nws lo rau lub cib lossis thaiv uas nws siv. Tsis tas li ntawd, nws txhim kho qhov ntim cua thiab ua kom cov mortar ua haujlwm tau zoo dua thiab yooj yim dua. Cov cellulose ethers ntxiv rau hauv cov mortar ua rau qeeb qeeb uas cov dej hauv cov khoom sib xyaw ua pa, ua rau cov mortar yooj yim dua rau kev siv thiab khi cov khoom ua ke kom ruaj khov dua.
Cov txiaj ntsig ntawm cellulose ether ntawm mortar
Qhov ntxiv cov cellulose ethers (HPMC/MHEC) rau hauv cov mortars muaj ntau yam zoo xws li kev txhim kho lub zog sib txuas. Lub zog sib txuas siab dua ua rau lub qauv ruaj khov mus sij hawm ntev, zam kev kho kim.
Cov cellulose ethers kuj muab kev ua haujlwm zoo dua rau cov mortar, ua rau nws yooj yim dua los tsim thiab txo lub sijhawm xav tau rau kev siv zog ntau. Qhov kev ua haujlwm zoo dua no pab ua kom nrawm dua thiab ua haujlwm tau zoo, yog li ua rau muaj kev tsim khoom ntau ntxiv hauv kev lag luam kev tsim kho.
Cellulose ether kuj tseem tuaj yeem txhim kho kev ua haujlwm ntawm cov mortar thiab xyuas kom muaj sijhawm txaus rau kev kho kom ruaj khov. Qhov no ua rau kev sib txuas ntawm cov ntaub ntawv siv hauv kev tsim kho zoo dua, ua rau cov qauv ruaj khov dua.
Cov cellulose ether additive mortars yooj yim dua los ntxuav, thiab tshem tawm cov khoom seem ntawm lub tsev tiav lawm tsis nyuaj. Qhov kev sib txuas ntxiv ntawm cov mortar rau cov khoom siv hauv tsev txhais tau tias muaj pov tseg tsawg dua vim tias cov khoom sib xyaw yuav tsis tawg lossis xoob ntawm cov qauv thaum lub sijhawm sib npaug.
xaus lus
Kev ntxiv cov cellulose ethers (HPMC/MHEC) rau cov mortars ua lub luag haujlwm tseem ceeb hauv kev txhim kho lub zog sib txuas ntawm cov mortars rau kev siv hauv kev tsim kho. Cellulose ethers muab kev khaws cia dej, txhim kho kev ua haujlwm ntawm cov mortar, thiab tso cai rau qhov qeeb qeeb ntawm kev ua kom cov khoom sib txuas zoo dua. Kev nce lub zog sib txuas ua kom ntseeg tau tias qhov ruaj khov ntawm cov qauv, txo cov teeb meem kev saib xyuas tsis tau xav txog, 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 cov cellulose ethers yuav tsum tau siv dav hauv kev lag luam kev tsim kho rau qhov zoo dua thiab cov haujlwm tsim kho ruaj khov dua.
Lub sijhawm tshaj tawm: Cuaj hlis-01-2023