Kodi mungapange bwanji methylcellulose?

Choyamba, cellulose yaiwisi yamatabwa / thonje woyengedwa amaphwanyidwa, kenako ndi alkali ndi pulped pansi pa caustic soda. Onjezani olefin oxide (monga ethylene oxide kapena propylene oxide) ndi methyl chloride ya etherification. Pomaliza, kutsuka madzi ndi kuyeretsa kumachitika kuti pomaliza apeze choyeramethylcelluloseufa. Ufa uwu, makamaka yankho lamadzimadzi, uli ndi zinthu zosangalatsa zakuthupi. Ether ya cellulose yomwe imagwiritsidwa ntchito pomanga ndi methyl hydroxyethyl cellulose ether kapena methyl hydroxypropyl cellulose (yotchedwa MHEC kapena MHPC, kapena dzina losavuta MC). Mankhwalawa amagwira ntchito yofunika kwambiri m'munda wamatope a ufa wouma. udindo wofunikira.

Kodi kusungidwa kwa madzi kwa methyl cellulose ether (MC) ndi chiyani?

Yankho: Mlingo wa kusungirako madzi ndi chimodzi mwa zizindikiro zofunika kwambiri zoyezera ubwino wa methyl cellulose ether, makamaka pakumanga kosanjikiza kwa simenti ndi matope a gypsum. Kusungidwa kwamadzi kolimbikitsidwa kumatha kuletsa bwino kutayika kwa mphamvu ndi kusweka chifukwa cha kuyanika kwambiri komanso kusakwanira kwamadzi. Kusungidwa bwino kwa madzi kwa methyl cellulose ether pansi pa kutentha kwakukulu ndi chimodzi mwa zizindikiro zofunika kusiyanitsa ntchito ya methyl cellulose ether. Nthawi zonse, kusungidwa kwa madzi kwa methyl cellulose ethers wamba kumachepa ndi kuwonjezeka kwa kutentha. Kutentha kumakwera kufika ku 40 ° C, kusunga madzi kwa ethers wamba ya methyl cellulose kumachepetsedwa kwambiri, zomwe ndizofunikira kwambiri m'madera otentha ndi owuma. Ndipo zomangamanga zowonda kwambiri kumbali ya dzuwa m'chilimwe zidzakhudza kwambiri. Komabe, kupanga chifukwa cha kusowa kwa madzi osungiramo madzi kudzera mu mlingo waukulu kumayambitsa kukhuthala kwakukulu kwa zinthuzo chifukwa cha mlingo waukulu, zomwe zingayambitse kusokoneza kumanga.

Kusungirako madzi ndikofunikira kwambiri kuti muwonjezere kuuma kwa machitidwe a mineral gelling. Pansi pa ntchito ya cellulose ether, chinyezicho chimatulutsidwa pang'onopang'ono kumalo osanjikiza kapena mpweya kwa nthawi yaitali, motero kuonetsetsa kuti zinthu za simenti (simenti kapena gypsum) zimakhala ndi nthawi yokwanira yolumikizana ndi madzi ndikuwumitsa pang'onopang'ono.

Kodi ntchito ya methyl cellulose ether mumatope owuma ndi otani?

Methyl hydroxyethyl cellulose ether (MHEC) ndi methyl hydroxypropyl cellulose ether (HPMC) pamodzi amatchedwa methyl cellulose ether.

M'munda wa matope a ufa wowuma, methyl cellulose ether ndi chinthu chofunikira chosinthidwa chamatope owuma monga matope opaka, pulasitala gypsum, zomatira matailosi, putty, zinthu zodziyimira pawokha, matope opopera, guluu wapamwamba ndi zinthu zowotcha. M'matope osiyanasiyana owuma a ufa, methyl cellulose ether makamaka imagwira ntchito yosunga madzi ndikukhuthala.