Focus on Cellulose ethers

Pehea ʻoe e hana ai i ka methylcellulose?

ʻO ka mea mua, ua ʻoki ʻia ka cellulose maka lāʻau pulp / pulupulu hoʻomaʻemaʻe ʻia, a laila alkalized a pulped ma lalo o ka hana o ka soda caustic. E hoʻohui i ka olefin oxide (e like me ka ethylene oxide a i ʻole propylene oxide) a me ka methyl chloride no ka etherification. ʻO ka hope, holoi ʻia ka wai a hoʻomaʻemaʻe ʻia e loaʻa i kahi keʻokeʻomethylcellulosepauda. ʻO kēia pauda, ​​ʻoi aku ka nui o kāna hoʻonā wai, loaʻa nā waiwai kino hoihoi. ʻO ka cellulose ether i hoʻohana ʻia i ka ʻoihana hana ʻo methyl hydroxyethyl cellulose ether a i ʻole methyl hydroxypropyl cellulose (i kapa ʻia ʻo MHEC a i ʻole MHPC, a i ʻole he inoa maʻalahi MC). He mea koʻikoʻi loa kēia huahana ma ke kahua o ka lepo lepo maloʻo. kuleana nui.

 

He aha ka paʻa wai o ka methyl cellulose ether (MC)?

Pane: ʻO ke kiʻekiʻe o ka paʻa ʻana o ka wai kekahi o nā hōʻailona koʻikoʻi no ke ana ʻana i ka maikaʻi o ka methyl cellulose ether, ʻoi aku hoʻi i ka hana ʻana i ka ʻili lahilahi o ka mortar me ka gypsum. Hiki i ka hoʻonui ʻia ʻana o ka wai ke pale pono i ke ʻano o ka nalo ʻana o ka ikaika a me ka haki ʻana ma muli o ka maloʻo nui a me ka lawa ʻole o ka hydration. ʻO ka paʻa wai maikaʻi o ka methyl cellulose ether ma lalo o nā kūlana wela kiʻekiʻe kekahi o nā hōʻailona koʻikoʻi e ʻike ai i ka hana o ka methyl cellulose ether. Ma lalo o nā kūlana maʻamau, e emi ana ka paʻa ʻana o ka wai o ka nui o nā methyl cellulose ethers me ka piʻi ʻana o ka mahana. Ke piʻi ka mahana i 40 ° C, hoʻemi nui ka paʻa ʻana o ka wai o nā methyl cellulose ethers maʻamau, he mea nui loa i nā wahi wela a maloʻo. A ʻo ke kūkulu ʻana i ka ʻāpana lahilahi ma ka ʻaoʻao o ka lā i ke kauwela e loaʻa i kahi hopena koʻikoʻi. Eia nō naʻe, ʻo ka hoʻoponopono ʻana i ka nele o ka paʻa ʻana o ka wai ma o ka dosage kiʻekiʻe e hoʻoulu ai i ka viscosity kiʻekiʻe o ka mea ma muli o ke ʻano kiʻekiʻe, kahi e pilikia ai ke kūkulu ʻana.

He mea koʻikoʻi ka paʻa ʻana o ka wai e hoʻopaʻa i ke kaʻina hana paʻakikī o nā ʻōnaehana gelling mineral. Ma lalo o ka hana o ka cellulose ether, hoʻokuʻu mālie ʻia ka wai i ka papa kumu a i ʻole ka ea ma kahi lōʻihi o ka manawa, no laila e hōʻoiaʻiʻo ai i ka mea cementitious (cement a gypsum) i ka manawa lōʻihi e launa pū me ka wai a paʻakikī mālie.

 

He aha ke kuleana o ka methyl cellulose ether i loko o ka mortar pauka maloʻo?

ʻO ka methyl hydroxyethyl cellulose ether (MHEC) a me ka methyl hydroxypropyl cellulose ether (HPMC) i hui pū ʻia me ka methyl cellulose ether.

Ma ke kahua o ka mortar pauka maloʻo, ʻo ka methyl cellulose ether kahi mea nui i hoʻololi ʻia no ka mortar pauka maloʻo e like me ka plastering mortar, plastering gypsum, tile adhesive, putty, self-leveling material, spray mortar, wallpaper glue and caulking material. I loko o nā mortar pauka maloʻo, ʻo ka methyl cellulose ether ka mea nui i ka hana o ka mālama ʻana i ka wai a me ka mānoanoa.


Ka manawa hoʻouna: Jan-09-2023
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