Cellulose ethers feem ntau yog siv los ua cov khoom siv ntxiv hauv kev tsim kho cov ntaub ntawv vim lawv muaj peev xwm hloov kho rheological thiab mechanical zog ntawm cov khoom. Tshwj xeeb, lawv feem ntau muab tso rau hauv gypsum mortars los txhim kho fluidity, workability thiab adhesion. Txawm li cas los xij, cov txiaj ntsig tshwj xeeb ntawm cellulose ether viscosity ntawm kev ua haujlwm ntawm gypsum mortar tseem tsis tau qhia meej. Daim ntawv no tshuaj xyuas cov ntaub ntawv uas twb muaj lawm ntawm lub ncauj lus no thiab tham txog qhov muaj peev xwm cuam tshuam ntawm cellulose ether viscosity ntawm cov khoom ntawm gypsum mortars.
Cellulose ethers yog dej-soluble polymers muab los ntawm cellulose, ib tug natural polymer pom nyob rau hauv cov nroj tsuag cell phab ntsa. Lawv feem ntau yog siv los ua thickeners, binders thiab stabilizers nyob rau hauv ntau yam kev lag luam siv nrog rau cov khoom noj, tshuaj pleev ib ce, tshuaj thiab khoom siv. Hauv kev tsim kho, lawv feem ntau muab tso rau hauv mortars los txhim kho kev ua haujlwm, adhesion thiab durability.
Gypsum yog cov ntxhia ntuj tsim los ntawm calcium sulfate dihydrate. Nws yog dav siv nyob rau hauv kev tsim kho rau nws cov hluav taws-resistant zog thiab suab thiab thermal rwb thaiv tsev zog. Gypsum mortar feem ntau yog siv los ua primer rau stucco phab ntsa thiab qab nthab, nrog rau kev ua tiav tiav rau kev tsim kho phab ntsa.
Thaum cellulose ether ntxiv rau gypsum mortar, nws tuaj yeem hloov pauv cov khoom ntawm cov khoom sib xyaw. Rheology yog kev kawm txog deformation thiab ntws ntawm cov ntaub ntawv nyob rau hauv kev ntxhov siab. Kev coj tus cwj pwm ntawm gypsum mortar tuaj yeem ua tau los ntawm nws cov viscosity, uas yog ib qho kev ntsuas ntawm nws qhov tsis kam ntws. Lub viscosity ntawm mortar yog cuam tshuam los ntawm ntau yam, nrog rau hom thiab concentration ntawm cellulose ether, particle loj thiab faib ntawm gypsum, thiab qhov ratio ntawm dej rau cement.
Cov viscosity cellulose ethers siab dua yuav muaj kev cuam tshuam ntau dua ntawm kev coj tus cwj pwm ntawm gypsum mortar dua li qis viscosity ethers. Piv txwv li, cov kev tshawb fawb tau pom tias ntxiv high-viscosity hydroxypropylmethylcellulose (HPMC) rau gypsum mortar tuaj yeem ua rau kom cov viscosity ntawm cov khoom sib tov thiab txhim kho nws txoj haujlwm, thaum cov viscosity tsawg HPMC muaj kev cuam tshuam me ntsis ntawm tus cwj pwm ntws ntawm cov tshuaj khib. Qhov no qhia tau hais tias kev ua tau zoo ntawm gypsum mortar nyob ntawm seb hom thiab viscosity ntawm cellulose ether siv.
Ib qho txiaj ntsig tseem ceeb ntawm kev sib koom ua ke ntawm cellulose ether rau hauv gypsum mortar yog tias nws txhim kho kev ua haujlwm ntawm kev sib tov. Kev ua tau zoo yog hais txog qhov yooj yim uas cov khoom siv tuaj yeem sib xyaw, muab tso thiab compacted. Kev ua haujlwm siab gypsum mortars tuaj yeem siv rau ntawm qhov chaw yooj yim dua, ua rau muaj kev sib tw, zoo dua qub. Cellulose ethers tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom sib xyaw los ntawm kev txo qhov tshwm sim ntawm kev sib cais thiab los ntshav, uas tshwm sim thaum cov khoom hnyav dua hauv cov tshuaj khib nyiab tawm ntawm qhov sib tov thaum tsim kho.
Ntxiv rau qhov cuam tshuam rau kev ua haujlwm, viscosity ntawm cellulose ether tseem yuav cuam tshuam rau kev ua haujlwm nplaum ntawm gypsum mortar. Adhesion yog lub peev xwm ntawm cov khoom siv los txuas rau lwm qhov chaw. Lub xub ntiag ntawm cellulose ether nyob rau hauv gypsum mortar tuaj yeem txhim kho nws qhov adhesion rau qhov chaw los ntawm kev ua kom thaj chaw sib cuag thiab txo cov huab cua nyob nruab nrab ntawm qhov chaw. High-viscosity cellulose ethers muaj txiaj ntsig zoo dua li qis-viscosity ethers ntawm kev txhim kho adhesion vim tias lawv tsim kev sib raug zoo ntawm qhov chaw.
Lwm cov cuab yeej tseem ceeb ntawm gypsum mortar yog nws lub sijhawm teeb tsa, lub sijhawm nws siv rau kev sib xyaw kom tawv thiab txhim kho lub zog. Lub sijhawm teeb tsa ntawm gypsum mortar tuaj yeem hloov pauv los ntawm kev ntxiv cellulose ether, uas tuaj yeem cuam tshuam cov txheej txheem dej ntawm gypsum hais. Hydration yog cov tshuaj tiv thaiv uas tshwm sim thaum dej ntxiv rau gypsum, ua rau tsim cov calcium sulfate dihydrate crystals.
Lub viscosity ntawm cellulose ether muaj qhov cuam tshuam loj rau kev ua haujlwm ntawm gypsum mortar. Cov viscosity cellulose ethers siab dua tuaj yeem txhim kho cov txheej txheem, cov khoom nplaum thiab teeb tsa lub sijhawm sib xyaw, thaum qis viscosity ethers yuav muaj kev cuam tshuam me ntsis ntawm cov khoom no. Cov txiaj ntsig tshwj xeeb ntawm cellulose ether viscosity nyob ntawm ntau yam, suav nrog hom thiab concentration ntawm ether, qhov loj me thiab kev faib tawm ntawm gypsum, thiab qhov sib piv ntawm cov dej rau cement. Kev tshawb fawb ntxiv yog xav tau kom nkag siab txog kev sib raug zoo ntawm cellulose ether viscosity thiab gypsum mortar zog, tab sis cov ntaub ntawv muaj qhia tias qhov no yog ib qho tseem ceeb uas yuav tsum tau xav txog thaum tsim cov khoom siv hauv tsev.
Post lub sij hawm: Aug-15-2023