Ua ntej, cellulose raw khoom ntoo pulp / refined paj rwb yog crushed, ces alkalized thiab pulped nyob rau hauv qhov kev txiav txim ntawm caustic soda. Ntxiv olefin oxide (xws li ethylene oxide los yog propylene oxide) thiab methyl chloride rau etherification. Thaum kawg, kev ntxuav dej thiab ntxuav kom huv yog ua tiav kom tau txais cov xim dawbmethylcellulosehmoov. Cov hmoov no, tshwj xeeb tshaj yog nws cov tshuaj aqueous, muaj lub cev zoo nkauj. Cov cellulose ether siv nyob rau hauv kev tsim kho kev lag luam yog methyl hydroxyethyl cellulose ether los yog methyl hydroxypropyl cellulose (hu ua MHEC los yog MHPC, los yog lub npe yooj yim dua MC). Cov khoom no plays lub luag hauj lwm tseem ceeb heev nyob rau hauv lub teb ntawm qhuav hmoov mortar. lub luag haujlwm tseem ceeb.
Dab tsi yog dej tuav ntawm methyl cellulose ether (MC)?
Teb: Cov qib dej tuav yog ib qho tseem ceeb ntsuas ntsuas qhov zoo ntawm methyl cellulose ether, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem nyias ntawm cov cement-based thiab gypsum-based mortar. Txhim kho dej tuav tau zoo tuaj yeem tiv thaiv qhov tshwm sim ntawm lub zog poob thiab tawg los ntawm kev ziab ntau dhau thiab dej tsis txaus. Kev tuav dej zoo heev ntawm methyl cellulose ether nyob rau hauv qhov kub thiab txias yog ib qho tseem ceeb qhia kom paub qhov txawv ntawm methyl cellulose ether. Nyob rau hauv ib txwm muaj xwm txheej, cov dej tuav ntawm feem ntau methyl cellulose ethers txo qis nrog qhov kub thiab txias. Thaum qhov kub nce mus txog 40 ° C, cov dej khaws cia ntawm cov methyl cellulose ethers tau txo qis heev, uas yog qhov tseem ceeb heev hauv qhov kub thiab qhuav. Thiab cov txheej txheem nyias nyias ntawm sab hnub ci nyob rau lub caij ntuj sov yuav muaj kev cuam tshuam loj heev. Txawm li cas los xij, ua kom tsis muaj dej tuav los ntawm kev siv ntau ntau yuav ua rau cov khoom muaj viscosity siab vim yog siv ntau, uas yuav ua rau tsis yooj yim rau kev tsim kho.
Kev tuav dej yog ib qho tseem ceeb heev los txhim kho cov txheej txheem hardening ntawm cov ntxhia gelling tshuab. Nyob rau hauv qhov kev txiav txim ntawm cellulose ether, cov dej noo yog maj mam tso rau hauv lub hauv paus txheej los yog huab cua nyob rau lub sij hawm ntev, yog li xyuas kom meej tias cov cementitious khoom (cement los yog gypsum) muaj lub sij hawm ntev txaus los cuam tshuam nrog dej thiab maj mam harden.
Lub luag hauj lwm ntawm methyl cellulose ether nyob rau hauv qhuav hmoov mortar yog dab tsi?
Methyl hydroxyethyl cellulose ether (MHEC) thiab methyl hydroxypropyl cellulose ether (HPMC) raug hu ua methyl cellulose ether.
Nyob rau hauv daim teb ntawm cov hmoov qhuav mortar, methyl cellulose ether yog ib qho tseem ceeb hloov khoom siv rau cov hmoov qhuav mortar xws li plastering mortar, plastering gypsum, pobzeb nplaum, putty, self-leveling khoom, tshuaj tsuag mortar, wallpaper kua nplaum thiab cov khoom siv caulking. Nyob rau hauv ntau yam qhuav hmoov mortars, methyl cellulose ether mas plays lub luag hauj lwm ntawm dej tuav thiab thickening.
Post lub sij hawm: Jan-09-2023