Methylcellulose (MC)
Mawonekedwe a methylcellulose (MC) ndi:
[C6H7O2 (O) 3-H (OCH3) N \] x
Njira yopangira ndikupanga ma etheluse ether kudzera thonje loyatsidwa pambuyo pa thonje loyengedwa litathandizidwa ndi alkali, ndipo methyl chloride amagwiritsidwa ntchito ngati wothandizira. Nthawi zambiri, kuchuluka kwa zolowa ndi 1.6 ~ 2.0, ndipo solubility ndizosiyananso ndi madigiri osiyanasiyana. Ndi ya ether ether ether ether.
Methylcellulose ndi kusungunuka m'madzi ozizira, ndipo zimakhala zovuta kusungunuka m'madzi otentha. Njira yake yothetsera matenda imakhala yokhazikika mu pro = 3 ~ 12.
Imakhala ndi kulumikizana bwino ndi wowuma, Guar Gum, etc. ndi ambiri okonda. Kutentha kukafika kwa kutentha kwa kutentha, gelation kumachitika.
Kusunga kwamadzi kwa methylnellulose kumadalira kuchuluka kwake, mafakisoni, tinthu tambiri tosintha.
Nthawi zambiri, ngati kuchuluka kwake ndi kwakukulu, kukoma mtima ndikochepa, ndipo ma virus ndi akulu, osunga madzi ndi okwera. Pakati pawo, kuchuluka kwa kuwonjezera komwe kumapangitsa kuti pakhale madzi osunga madzi, ndipo kuchuluka kwa ma virus sikuphatikizidwa mwachindunji pamlingo wamadzi osamala yamadzi. Chiwerengero chophweka chimatengera kuchuluka kwa kuchuluka kwa ma cellulose tinthu tating'onoting'ono.
Pakati pa cellulose yomwe ili pamwambapa, methyl cellulose ndi hydroxypropyl meth celyl cellulose imakhala ndi mitengo yapamwamba yamadzi.
Carboxymethylcellulose (CMC)
Carboxymethyl cellulose, yomwe imadziwikanso kuti sodium carboxyl cellulose, cmc, mchere wa anionic, sodium, sodible. Zamankhwala zopangira.
Amagwiritsidwa ntchito makamaka m'malo ogulitsa oletsa, mafakitale azakudya ndi munda wamafuta amadzimadzi, ndipo kuchuluka komwe kumagwiritsidwa ntchito popanga maakaunti pafupifupi 1%.
Ionic cellulose ether amapangidwa kuchokera ku ulusi wachilengedwe (thonje, etc.) Pambuyo mankhwala a alkali, pogwiritsa sodium monochlorookertatetate monga momwe amathandizira.
Mulingo wazolowa m'malo mwake 0,4 ~ 1.4, ndipo magwiridwe ake amakhudzidwa kwambiri ndi kuchuluka kwa mpweya.
CMC ili ndi luso labwino kwambiri, ndipo mankhwala ake am'madzi ali ndi mwayi wotayitsa, koma palibe mtengo wopunduka wa pulasitiki.
Pamene cmc imasungunuka, deolymerization imachitika. Makutuwo amayamba kutuluka pakusungunuka, kumadutsa kuchuluka kwake, kenako kumatsikira ku Plateau. Maumboni azomwezi amakhudzana ndi deollymerization.
Mlingo wa deolymerization umagwirizana kwambiri ndi kuchuluka kwa zosungunulira (madzi) pakupanga. Mu soloni yopanda mafuta, monga mano omwe ali ndi dzino lomwe lili ndi glycerin ndi madzi, masentimita sadzafika kwathunthu ndipo lifika pamtunda wofanana.
Pankhani ya matenda opatsidwa madzi, mphamvu ya hydrophilic kwambiri yolowera kwambiri cmc ndiyosavuta kuposa cmc yotsika.
Hydroxyethylcelulose (hec)
Hec imapangidwa ndikuchiritsa thonje loyengeza ndi alkali, kenako kubwereza mawu a Ethylene oxide ngati atumiki omizidwa mu Kukhalapo kwa acetone. Mulingo wazolowa m'malo mwake 1.5 ~ 2.0. Ili ndi hydrophilicity wamphamvu ndipo ndizosavuta kuyamwa chinyezi.
Hydroxyethyl cellose imasungunuka m'madzi ozizira, koma zimakhala zovuta kusungunuka m'madzi otentha. Njira yake imakhazikika kutentha kwambiri osafuula.
Ndiwokhazikika macitidi wamba ndi zitsulo. Alkalis imatha kugwira ntchito kuwonongeka kwake ndikuwonjezera pang'ono mamasukidwe ake. Kubalalitsa kwake m'madzi kumakulitsa pang'ono kuposa kwa methyl cellulose ndi hydroxypropyl methyl celluse.
Hydroxypropyl methyl cellulose (hpmc)
Mawonekedwe a HPMC ndi awa:
\ [C6h7o2 (o) 3-mn (och3) m, och2ch (oh) ch3 \] x
Hydroxypypyl methylcellulose ndi mitundu ya cellulose yomwe zotsatira zake ndi zogwiritsidwa ntchito zikuchulukirachulukira.
Ndiwopanda ma cellulose osakanizidwa ndi thonje lopangidwa kuchokera ku thonje loyeretsa, pogwiritsa ntchito ma propylen oxide ndi methyl chloride ngati zoyeserera. Mulingo wazolowa m'malo mwake 1.2 ~ 2.0.
Katundu wake ndi wosiyana chifukwa cha ma ratios osiyanasiyana a methoxyl zomwe zili ndi hydroxypropyl.
Hydroxypypyll methylcellulose imasungunuka mosavuta m'madzi ozizira, koma imakumana ndi vuto pakusungunuka m'madzi otentha. Koma kutentha kwake kwamadzi otentha kumakhala kokulirapo kuposa kwa methyl cellulose. Kusungunuka m'madzi ozizira kumathandizanso kwambiri poyerekeza ndi methyl cellulose.
Makulidwe a hydroxypropyll methylcellulose akukhudzana ndi kulemera kwake, komanso kunenepa kwambiri, ndikuwoneka bwino. Kutentha kumakhudzanso mamasukidwe awo, pamene kutentha kumakulirakulira, ma virucy amachepetsa. Komabe, mawonekedwe ake okwera amakhala ndi kutentha kochepa kuposa celyyl cellulose. Njira yake imakhala yokhazikika ikasungidwa kutentha.
Kusunga kwamadzi kwa hydroxypypyl kumatengera kuchuluka kwake, mafakisoni, ndi zina zambiri.
Hydroxypropyll methylcelulose ndi yokhazikika kwa asidi ndi alkali, ndipo yankho lake la madzi ndi lokhazikika mu pH = 2 ~ 12. Diasc Soda ndi madzi a laimu samalimbikitsa pang'ono pa ntchito yake, koma alkali amatha kufulumizitsa kufalikira kwake ndikuwonjezera mawonekedwe ake.
Hydroxypylropyl ndi chokhazikika pamchere wambiri, koma pamene kuchuluka kwa mchere ndi yayitali, mamasukidwe a hydroxypropyl so methylcellulose yankho limayamba kuchuluka.
Hydroxypropyl akhoza kusakanikirana ndi ma polymer polymer opanga ma yunifolomu ndi njira yapamwamba kwambiri. Monga mowa wa mulyvinyl, madzi owuma, masamba chingamu, etc.
Hydroxypropyl methylcelulose ili ndi enzyme yolimba kuposa methylcellulose, ndipo yankho lake limakhala lopanda tanthauzo kuposa methylcelulose
Post Nthawi: Feb-14-2023