A:
MC ndi methyl cellulose: amayengedwa thonje pambuyo pa mankhwala a alkali, methane chloride ngati etherifying agent, kudzera muzotsatira zingapo kuti apange cellulose ether. Nthawi zambiri, mlingo woloweza m'malo ndi 1.6 ~ 2.0, ndipo kusungunuka kwake kumasiyanasiyana ndi kuchuluka kwa kulowetsa. Ndi ya nonionic cellulose ether.
(1) Kusungidwa kwa madzi kwa methyl cellulose kumadalira kuchuluka kwake, kukhuthala, kukongola kwa tinthu ndi kuchuluka kwa kusungunuka. Nthawi zambiri kuwonjezera kuchuluka, fineness yaing'ono, mamasukidwe akayendedwe, madzi posungira mlingo ndi mkulu. Kuchuluka kwa zowonjezera kumakhudza kwambiri kuchuluka kwa madzi osungiramo madzi, ndipo kukhuthala kwake sikuli kofanana ndi kusungirako madzi. The Kusungunuka mlingo makamaka zimadalira pamwamba kusinthidwa digirii ndi tinthu fineness wa mapadi particles. M'ma cellulose ether angapo pamwambapa, methyl cellulose ndi HPMC hydroxypropyl methyl cellulose madzi osungira madzi ndi apamwamba.
(2) Methyl cellulose imasungunuka m'madzi ozizira, omwe ndi ovuta kusungunuka m'madzi otentha. Njira yake yamadzimadzi imakhala yokhazikika mkati mwa pH = 3 ~ 12. Imagwirizana bwino ndi wowuma, chingamu cha guanidine ndi ma surfactants ambiri. Gelation imachitika pamene kutentha kumafika kutentha kwa gelation.
(3) Kusintha kwa kutentha kudzakhudza kwambiri kuchuluka kwa kusunga madzi kwa methyl cellulose. Nthawi zambiri, kutentha kumapangitsa kuti madzi asamasungidwe kwambiri. Ngati kutentha kwa matope kupitirira 40 ℃, kusungidwa kwa madzi kwa methyl cellulose kumakhala koyipa kwambiri, zomwe zimakhudza kwambiri kumangidwa kwa matope.
(4) Methyl cellulose imakhala ndi chikoka chodziwikiratu pakupanga ndi kumamatira kwamatope. "Kumamatira" apa kumatanthauza kumamatira kwa wogwira ntchito pakati pa chida ndi gawo lapansi la khoma, ndiko kukana kukameta ubweya wa matope. Kumamatira ndi kwakukulu, kukana kukameta ubweya wa matope ndi kwakukulu, mphamvu yofunikira ndi ogwira ntchito pakugwiritsa ntchito imakhalanso yaikulu, ndipo kumanga matope ndi osauka. Muzinthu za cellulose ether, kumamatira kwa methyl cellulose kumakhala pamlingo wocheperako.
HPMC ndi hydroxypropyl methyl cellulose: imapangidwa ndi thonje woyengedwa pambuyo pa mankhwala a alkali, ndi propylene oxide ndi chloromethane monga etherifying agent, kudzera muzochita zingapo komanso zopangidwa ndi cellulose yosakanizidwa ndi ether. Mlingo wolowa m'malo nthawi zambiri ndi 1.2 ~ 2.0. Makhalidwe ake amasiyana malinga ndi kuchuluka kwa methoxy ndi hydroxypropyl.
(1) HPMC hydroxypropyl methyl cellulose imasungunuka mosavuta m'madzi ozizira, omwe ndi ovuta kusungunuka m'madzi otentha. Komabe, kutentha kwake kwa gelation m'madzi otentha mwachiwonekere ndikokwera kuposa kwa methyl cellulose. Kusungunuka kwa methyl cellulose m'madzi ozizira kunasinthanso kwambiri.
(2) Kukhuthala kwa HPMC hydroxypropyl methyl cellulose kumagwirizana ndi kulemera kwake kwa maselo, ndipo kulemera kwake kwa molekyulu kumapangitsanso kukhuthala kwamphamvu. Kutentha kumakhudzanso mamasukidwe akayendedwe. Viscosity imachepa pamene kutentha kumawonjezeka. Koma kukhuthala kwake kutentha kwambiri kumakhala kotsika kuposa methyl cellulose. Yankho lake ndi lokhazikika likasungidwa kutentha.
(3) HPMC hydroxypropyl methyl cellulose imakhala yokhazikika ku asidi ndi maziko, ndipo njira yake yamadzimadzi imakhala yokhazikika pa pH = 2 ~ 12. Koloko ndi madzi a mandimu alibe mphamvu zochepa pa katundu wake, koma zamchere zimatha kufulumizitsa kusungunuka kwake ndikuwongolera kukhuthala. HPMC hydroxypropyl methyl cellulose imakhala yokhazikika ku mchere wamba, koma mchere ukakhala wambiri, kukhuthala kwa HPMC hydroxypropyl methyl cellulose solution kumawonjezeka.
(4) Kusungidwa kwa madzi kwa HPMC hydroxypropyl methyl cellulose kumadalira mlingo wake ndi kukhuthala kwake, komanso kuchuluka kwa madzi a HPMC hydroxypropyl methyl cellulose ndi apamwamba kuposa a methyl cellulose pa mlingo womwewo.
(5) HPMC hydroxypropyl methyl cellulose akhoza kusakaniza ndi madzi sungunuka polima mankhwala kukhala yunifolomu, apamwamba mamasukidwe akayendedwe njira. Monga polyvinyl mowa, wowuma ether, masamba guluu ndi zina zotero.
(6) Kumamatira kwa HPMC hydroxypropyl methyl cellulose pakupanga matope ndikokwera kuposa methyl cellulose.
(7) HPMC hydroxypropyl methyl cellulose ili ndi kukana bwino kwa enzyme kuposa methyl cellulose, ndipo njira yake yowonongeka ya enzyme ndiyotsika kuposa ya methyl cellulose.
Nthawi yotumiza: May-26-2022