Cellulose ether ndi polima yopangidwa kuchokera ku cellulose yachilengedwe kudzera mu kusintha kwa mankhwala. Cellulose ether ndi yochokera ku cellulose yachilengedwe. Kupanga kwa cellulose ether ndi kosiyana ndi ma polima opangidwa. Zinthu zake zofunika kwambiri ndi cellulose, chinthu chachilengedwe cha polymer. Chifukwa cha kapangidwe ka cellulose yachilengedwe, cellulose yokha ilibe mphamvu yochitapo kanthu ndi zinthu zoyeretsera. Komabe, pambuyo pochiza chotupa, ma hydrogen amphamvu pakati pa unyolo wa mamolekyu ndi unyolo amawonongeka, ndipo kutulutsidwa kwa hydroxyl kumayamba kukhala reactive alkali cellulose. Pezani cellulose ether.
Katundu wa ma ether a cellulose amadalira mtundu, chiwerengero ndi kufalikira kwa ma substituent. Kugawidwa kwa ether ya cellulose kumagawidwanso malinga ndi mtundu wa substituent, digiri ya etherification, kusungunuka ndi makhalidwe ofanana ndi ogwiritsira ntchito. Malinga ndi mtundu wa ma substituents pa unyolo wa molekyulu, ukhoza kugawidwa mu monoether ndi mixed ether. MC yomwe timagwiritsa ntchito nthawi zambiri ndi monoether, ndipo HPMC ndi mixed ether. Methyl cellulose ether MC ndi chinthu chomwe chimachitika pambuyo poti gulu la hydroxyl pa unit ya glucose ya natural cellulose limalowetsedwa m'malo ndi methoxy. Ndi chinthu chomwe chimapezeka posintha gawo la gulu la hydroxyl pa unit ndi gulu la methoxy ndi gawo lina ndi gulu la hydroxypropyl. Fomula yomangira ndi [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethylmethyl cellulose ether HEMC, awa ndi mitundu yayikulu yomwe imagwiritsidwa ntchito kwambiri komanso yogulitsidwa pamsika.
Ponena za kusungunuka, ikhoza kugawidwa m'magulu a ionic ndi non-ionic. Ma ether a cellulose osungunuka m'madzi amapangidwa makamaka ndi ma ether awiri a alkyl ndi ma ether a hydroxyalkyl. Ionic CMC imagwiritsidwa ntchito kwambiri mu sopo yopangira, kusindikiza ndi kupaka utoto nsalu, kufufuza chakudya ndi mafuta. Non-ionic MC, HPMC, HEMC, ndi zina zotero zimagwiritsidwa ntchito kwambiri mu zipangizo zomangira, zokutira za latex, mankhwala, mankhwala a tsiku ndi tsiku, ndi zina zotero. Amagwiritsidwa ntchito ngati chokhuthala, chosungira madzi, chokhazikika, chosungunula ndi chopangira filimu.
Kuzindikira khalidwe la ether ya cellulose:
Zotsatira za kuchuluka kwa methoxyl pa ubwino: kusunga madzi ndi kukhuthala kwake
Mphamvu ya hydroxyethoxyl/hydroxypropoxyl: kuchuluka kwa hydroxyethoxyl, kumathandizanso kuti madzi azisungidwa bwino.
Mphamvu ya kukhuthala kwa zinthu: kuchuluka kwa polymerization, kukhuthala kwa zinthu kumakhala kwakukulu komanso kusunga madzi bwino.
Mphamvu ya kusalala kwa matope: kufalikira ndi kusungunuka bwino mu matope, kumakhala kofulumira komanso kofanana, ndipo kusunga madzi kumakhala bwino.
Mphamvu ya kuwala: kuchuluka kwa polymerization, kuchuluka kwa polymerization kumakhala kofanana, komanso kuipitsidwa kochepa
Kukhudza kutentha kwa gel: kutentha kwa gel pomanga ndi pafupifupi 75°C
Mphamvu ya khalidwe la madzi: <5%, ether ya cellulose ndi yosavuta kuyamwa chinyezi, kotero iyenera kutsekedwa ndikusungidwa
Kuchuluka kwa phulusa: <3%, phulusa likachuluka, zinyalala zimachuluka
PH mtengo khalidwe zotsatira: pafupi ndi neutral, cellulose etha ali ndi ntchito yokhazikika pakati pa PH: 2-11
Nthawi yotumizira: Feb-14-2023