Okokuqala, i-cellulose ekrwada i-pulp yamaplanga / umqhaphu osulungekileyo uyatyunyuzwa, emva koko i-alkalized kwaye ifakwe phantsi kwesenzo se-caustic soda. Yongeza i-olefin oxide (efana ne-ethylene oxide okanye i-propylene oxide) kunye ne-methyl chloride ye-etherification. Ekugqibeleni, ukuhlanjwa kwamanzi kunye nokuhlanjululwa kuqhutyelwa ekugqibeleni ukufumana umhlophei-methylcelluloseumgubo. Lo mgubo, ngokukodwa isisombululo sawo samanzi, uneempawu ezibonakalayo ezinomdla. I-ether ye-cellulose esetyenziswa kushishino lokwakha yi-methyl hydroxyethyl cellulose ether okanye i-methyl hydroxypropyl cellulose (ebizwa ngokuba yi-MHEC okanye i-MHPC, okanye igama elenziwe lula ngakumbi i-MC). Le mveliso idlala indima ebaluleke kakhulu kwintsimi yodaka olomileyo lwepowder. indima ebalulekileyo.
Yintoni ukugcinwa kwamanzi kwi-methyl cellulose ether (MC)?
Impendulo: Inqanaba lokugcinwa kwamanzi sesinye sezibonakaliso ezibalulekileyo zokulinganisa umgangatho we-methyl cellulose ether, ngokukodwa kulwakhiwo oluncinci lwe-cement-based and gypsum-based mortar. Ukugcinwa kwamanzi okuphuculweyo kunokuthintela ngokufanelekileyo into yokulahleka kwamandla kunye nokuqhekeka okubangelwa ukomisa ngokugqithiseleyo kunye nokungonelanga kwe-hydration. Ukugcinwa kwamanzi okugqwesileyo kwe-methyl cellulose ether phantsi kweemeko eziphezulu zokushisa kungenye yezibonakaliso ezibalulekileyo zokwahlula ukusebenza kwe-methyl cellulose ether. Phantsi kweemeko eziqhelekileyo, ukugcinwa kwamanzi kwezona ziqhelekileyo ze-methyl cellulose ethers kuncipha ngokunyuka kwamaqondo obushushu. Xa izinga lokushisa liphakama ukuya kuma-40 ° C, ukugcinwa kwamanzi kwi-methyl cellulose ethers eqhelekileyo kuyancipha kakhulu, okubaluleke kakhulu kwiindawo ezishushu nezomileyo. Kwaye ukwakhiwa kwe-thin-layer kwicala elinelanga ehlobo kuya kuba nefuthe elibi. Nangona kunjalo, ukwenza ukungabikho kokugcinwa kwamanzi ngokusebenzisa i-dosage ephezulu kuya kubangela i-viscosity ephezulu yezinto ngenxa ye-dosage ephezulu, eya kubangela ukuphazamiseka ekwakhiweni.
Ukugcinwa kwamanzi kubaluleke kakhulu ukunyusa inkqubo yokuqina kweenkqubo ze-mineral gelling. Ngaphantsi kwesenzo se-cellulose ether, umswakama ukhutshwa ngokuthe ngcembe kwisiseko sesiseko okanye emoyeni ixesha elide, ngaloo ndlela uqinisekisa ukuba izinto ze-cementitious (samente okanye i-gypsum) zinexesha elide elaneleyo lokusebenzisana namanzi kwaye ngokuthe ngcembe lukhuni.
Iyintoni indima ye-methyl cellulose ether kwi-powder mortar eyomileyo?
I-Methyl hydroxyethyl cellulose ether (MHEC) kunye ne-methyl hydroxypropyl cellulose ether (HPMC) zibizwa ngokuba yi-methyl cellulose ether.
Kwintsimi yodaka olomileyo lomgubo, i-methyl cellulose ether yinto ebalulekileyo elungisiweyo yodaka olomileyo olunjengodaka, igypsum yokutyabeka, iglue yethayile, i-putty, i-self-leveling material, i-spray mortar, i-wallpaper glue kunye ne-caulking material. Kwiintlobo ngeentlobo zomgubo wodaka owomileyo, i-methyl cellulose ether idlala indima enkulu yokugcina amanzi kunye nokujiya.
Ixesha lokuposa: Jan-09-2023