ʻEtera Cellulose

ʻEtera celluloseHana ʻia mai ka cellulose ma o ka hopena etherification o hoʻokahi a i ʻole kekahi mau mea etherification a me ka wili maloʻo. Wahi a nā ʻano kemika like ʻole o nā mea pani ether, hiki ke hoʻokaʻawale ʻia nā cellulose ethers i nā anionic, cationic a me nonionic ethers. ʻO nā Ionic cellulose ethers ka mea nuiʻEtera carboxymethyl cellulose (CMC); ʻo nā ethers cellulose non-ionic e komo pū memethyl cellulose ether (MC),ʻEtera hydroxypropyl methyl cellulose (HPMC)a me ka hydroxyethyl cellulose ether.ʻEtera klorin (HC)a pēlā aku. Ua māhele ʻia nā ethers non-ionic i nā ethers wai-soluble a me nā ethers ʻaila-soluble, a hoʻohana nui ʻia nā ethers wai-soluble non-ionic i nā huahana mortar. I ke alo o nā ion calcium, ʻaʻole paʻa ka ionic cellulose ether, no laila ʻaʻole hoʻohana pinepine ʻia i nā huahana mortar maloʻo-hui ʻia e hoʻohana ana i ka sima, ka lime slaked, a pēlā aku e like me nā mea sima. Hoʻohana nui ʻia nā ethers cellulose wai-soluble nonionic i ka ʻoihana mea kūkulu hale ma muli o ko lākou kūpaʻa hoʻokuʻu a me ka paʻa ʻana o ka wai.

Nā Waiwai Kemika o ka Cellulose Ether

Loaʻa i kēlā me kēia cellulose ether ke ʻano kumu o ka cellulose — ʻano Anhydroglucose. I ke kaʻina hana o ka hana ʻana i ka cellulose ether, hoʻomehana mua ʻia ka fiber cellulose i loko o kahi hopena alkaline, a laila mālama ʻia me kahi mea etherifying. Hoʻomaʻemaʻe ʻia ka huahana hopena fibrous a wili ʻia e hana i kahi pauka like me kahi fineness.

I ke kaʻina hana o MC, hoʻohana wale ʻia ka methyl chloride ma ke ʻano he mea etherification; ma waho aʻe o ka methyl chloride, hoʻohana pū ʻia ka propylene oxide e loaʻa ai nā hui substituent hydroxypropyl i ka hana ʻana o HPMC. Loaʻa i nā ʻano cellulose ethers like ʻole nā ​​​​lakio methyl a me hydroxypropyl substitution, kahi e hoʻopilikia ai i ka hoʻohālikelike organik a me ka mahana gelation thermal o nā hopena cellulose ether.