Cellulose ether ndi polima pawiri wopangidwa kuchokera ku cellulose wachilengedwe kudzera mu njira ya etherification, ndipo ndi wokhuthala kwambiri komanso wosunga madzi.
Mbiri Yakufufuza
Ma cellulose ethers akhala akugwiritsidwa ntchito kwambiri mumatope osakaniza owuma m'zaka zaposachedwa, omwe amagwiritsidwa ntchito kwambiri ndi ena omwe si a ionic cellulose ethers, kuphatikizapo methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC). ) ndi hydroxypropyl methyl cellulose ether (HPMC).Pakalipano, palibe mabuku ambiri okhudza njira yoyezera makulidwe a cellulose ether solution.M'dziko lathu, milingo ndi ma monographs okha ndi omwe amafotokozera njira yoyesera ya kukhuthala kwa cellulose ether solution.
Njira yokonzekera yankho la cellulose ether
Kukonzekera kwa Methyl Cellulose Ether Solution
Methyl cellulose ethers amatanthawuza ma cellulose ether okhala ndi magulu a methyl mu molekyulu, monga MC, HEMC ndi HPMC.Chifukwa cha hydrophobicity ya gulu la methyl, mayankho a cellulose ether okhala ndi magulu a methyl amakhala ndi matenthedwe a gelation, ndiye kuti, samasungunuka m'madzi otentha pa kutentha kwakukulu kuposa kutentha kwa gelation (pafupifupi 60-80 ° C).Pofuna kupewa yankho la cellulose ether kuti lipange ma agglomerates, tenthetsani madzi pamwamba pa kutentha kwa gel osakaniza, pafupifupi 80 ~ 90 ° C, kenaka yikani ufa wa cellulose ether m'madzi otentha, yambitsani kuti mubalalike, pitirizani kuyambitsa ndi kuziziritsa mpaka pansi. kutentha, zikhoza kukonzedwa mu yunifolomu mapadi efa njira.
Kusungunuka kwa ma ether omwe alibe mankhwala a methylcellulose
Pofuna kupewa agglomeration wa mapadi efa pa ndondomeko kuvunda, opanga nthawi zina kuchita mankhwala pamwamba mankhwala pa ufa mapadi etere mankhwala kuchedwa Kutha.Kusungunuka kwake kumachitika pambuyo poti cellulose ether itabalalika kwathunthu, kotero imatha kumwazikana mwachindunji m'madzi ozizira ndi pH yopanda ndale popanda kupanga ma agglomerates.Kukwera kwa pH ya yankho, kumachepetsa nthawi yosungunuka ya cellulose ether ndikuchedwa kusungunuka.Sinthani pH ya yankho kukhala mtengo wapamwamba.Alkalinity idzathetsa kuchedwa kwa kusungunuka kwa cellulose ether, kuchititsa kuti cellulose ether kupanga ma agglomerates ikasungunuka.Choncho, pH mtengo wa yankho uyenera kukwezedwa kapena kutsika pambuyo poti cellulose ether itabalalitsidwa.
Kusungunuka kwa ma ether okhala ndi methylcellulose okhala ndi pamwamba
Kukonzekera kwa Hydroxyethyl Cellulose Ether Solution
Hydroxyethyl cellulose ether (HEC) yankho alibe katundu wa matenthedwe gelation, Choncho, HEC popanda mankhwala pamwamba adzapanganso agglomerates m'madzi otentha.Opanga nthawi zambiri amapanga mankhwala pamwamba pa HEC ya ufa kuti achedwetse kusungunuka, kuti athe kumwazikana mwachindunji m'madzi ozizira ndi pH yopanda ndale popanda kupanga ma agglomerates.Mofananamo, mu yankho ndi mkulu alkalinity, HEC Ikhozanso kupanga ma agglomerates chifukwa cha kuchedwa kutayika kwa solubility.Popeza simenti slurry ndi zamchere pambuyo hydration ndi pH mtengo wa yankho ndi pakati 12 ndi 13, mlingo Kutha kwa pamwamba ankachitira mapaipi efa mu slurry simenti nayenso mofulumira kwambiri.
Solubility katundu wa pamwamba-mankhwala HEC
Pomaliza ndi Kusanthula
1. Njira yobalalika
Pofuna kupewa zovuta pa nthawi yoyesera chifukwa cha kusungunuka kwapang'onopang'ono kwa zinthu zochizira pamwamba, tikulimbikitsidwa kugwiritsa ntchito madzi otentha pokonzekera.
2. Kuzizira ndondomeko
Miyezo ya cellulose ether iyenera kugwedezeka ndikuziziritsidwa pa kutentha kozungulira kuti muchepetse kuzizira, komwe kumafunikira nthawi yayitali yoyesera.
3. Kuyambitsa ndondomeko
Pambuyo powonjezera cellulose ether m'madzi otentha, onetsetsani kuti mukupitiriza kuyambitsa.Pamene kutentha kwa madzi kumatsika pansi pa kutentha kwa gel osakaniza, cellulose ether imayamba kusungunuka, ndipo yankho lidzakhala lowoneka bwino.Panthawi imeneyi, kuthamanga kwachangu kuyenera kuchepetsedwa.Njira yothetsera ikafika kukhuthala kwina, imafunika kuyimirira kwa maola opitilira 10 thovu lisanayandame pang'onopang'ono kuphulika ndikuzimiririka.
Mabubu a Air mu Cellulose Ether Solution
4. Njira ya hydrating
Ubwino wa cellulose ether ndi madzi uyenera kuyesedwa molondola, ndipo yesetsani kuti musadikire kuti yankho lifike pamtunda wapamwamba musanadzazenso madzi.
5. Mayeso a viscosity
Chifukwa cha thixotropy wa cellulose ether solution, poyesa kukhuthala kwake, pamene rotor ya viscometer yozungulira imayikidwa mu yankho, idzasokoneza yankho ndikukhudza zotsatira zake.Choncho, rotor ikalowetsedwa mu yankho, iyenera kuloledwa kuima kwa mphindi 5 musanayese.
Nthawi yotumiza: Mar-22-2023