Cellulose Etera

Cellulose eterahana ʻia mai ka cellulose ma o ka hopena etherification o hoʻokahi a i ʻole kekahi mau mea etherification a me ka wili maloʻo. E like me nā ʻano kemika ʻokoʻa o nā mea pani ether, hiki ke hoʻokaʻawale ʻia nā cellulose ethers i nā anionic, cationic a me nā eter nonionic. ʻO ka Ionic cellulose ethers ka nuicarboxymethyl cellulose ether (CMC); non-ionic cellulose ethers nui loamethyl cellulose ether (MC),hydroxypropyl methyl cellulose ether (HPMC)a me ka hydroxyethyl cellulose ether.Klorine etera (HC)a pela aku. Hoʻokaʻawale ʻia nā ethers non-ionic i nā ethers hiki ke hoʻoheheʻe ʻia i ka wai a me nā ethers hiki ke hoʻoheheʻe ʻia i ka ʻaila, a ʻo nā ethers non-ionic wai-soluble e hoʻohana nui ʻia i nā huahana mortar. Ma ke alo o ka calcium ions, ʻaʻole paʻa ka ionic cellulose ether, no laila ua hoʻohana pinepine ʻia i nā huahana mortar maloʻo i hoʻohana ʻia e hoʻohana i ka sima, slaked lime, etc. Nonionic wai-soluble cellulose ethers ua hoʻohana nui ʻia i loko o ka ʻoihana hale kūkulu no ko lākou paʻa ʻana a me ka paʻa ʻana o ka wai.

ʻO ke kinona o ka Cellulose Etera

Loaʻa i kēlā me kēia cellulose ether ke ʻano kumu o ka cellulose —Anhydroglucose structure. I ke kaʻina hana o ka cellulose ether, ua wela mua ka cellulose fiber i kahi hopena alkaline, a laila mālama ʻia me kahi mea etherifying. Hoʻomaʻemaʻe ʻia ka huahana fibrous reaction a hoʻomaʻemaʻe ʻia e hana i kahi pauka like ʻole me kahi ʻano maikaʻi.

Ma ke kaʻina hana o MC, hoʻohana wale ʻia ka methyl chloride ma ke ʻano he etherification agent; ma waho aʻe o ka methyl chloride, hoʻohana pū ʻia ka propylene oxide e kiʻi i nā pūʻulu substituent hydroxypropyl i ka hana ʻana o HPMC. He ʻokoʻa ka methyl a me ka hydroxypropyl eter o nā cellulose eter, e pili ana i ka hoʻohālikelike kūlohelohe a me ka mahana gelation thermal o nā hopena cellulose ether.