Cellulose ether ndi polima yopangidwa kuchokera ku cellulose yachilengedwe kudzera mu njira yopangira ether, ndipo ndi chinthu chabwino kwambiri chokhuthala komanso chosungira madzi.
Mbiri Yofufuzira
Ma cellulose ethers akhala akugwiritsidwa ntchito kwambiri mu matope osakanikirana ndi madzi 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). Pakadali pano, palibe mabuku ambiri okhudza njira yoyezera kukhuthala kwa yankho la cellulose ether. M'dziko lathu, pali miyezo ndi ma monographs ena okha omwe amafotokoza njira yoyesera kukhuthala kwa yankho la cellulose ether.
Njira yokonzekera yankho la ether ya cellulose
Kukonzekera kwa Methyl Cellulose Ether Solution
Ma ether a Methyl cellulose amatanthauza ma ether a cellulose okhala ndi magulu a methyl mu molekyulu, monga MC, HEMC ndi HPMC. Chifukwa cha hydrophobicity ya gulu la methyl, mayankho a ether a cellulose okhala ndi magulu a methyl ali ndi mphamvu zotenthetsera, kutanthauza kuti, sangasungunuke m'madzi otentha kutentha kopitilira kutentha kwawo kwa gelation (pafupifupi 60-80°C). Pofuna kupewa yankho la ether ya cellulose kupanga ma agglomerate, tenthetsani madzi pamwamba pa kutentha kwake kwa gel, pafupifupi 80~90°C, kenako onjezerani ufa wa ether ya cellulose m'madzi otentha, sakanizani kuti mumwazikane, pitirizani kusakaniza ndikuziziritsa. Ku kutentha komwe kwakhazikitsidwa, ikhoza kukonzedwa kukhala yankho la ether ya cellulose yofanana.
Katundu wosungunuka wa ma ether okhala ndi methylcellulose omwe sanatsukidwe pamwamba
Pofuna kupewa kusonkhana kwa cellulose ether panthawi yosungunuka, opanga nthawi zina amachita mankhwala pamwamba pa zinthu za ufa wa cellulose ether kuti achedwetse kusungunuka. Kusungunuka kwake kumachitika cellulose ether ikangosungunuka kwathunthu, kotero imatha kufalikira mwachindunji m'madzi ozizira ndi pH yopanda mbali popanda kupanga ma agglomerate. pH ya yankho ikakwera, nthawi yosungunuka ya cellulose ether yokhala ndi mawonekedwe osungunuka mochedwa imafupikitsidwa. Sinthani pH ya yankho kukhala yamtengo wapatali. Alkalinity idzachotsa kusungunuka kochedwa kwa cellulose ether, zomwe zimapangitsa cellulose ether kupanga ma agglomerate ikasungunuka. Chifukwa chake, pH ya yankho iyenera kukwezedwa kapena kuchepetsedwa cellulose ether ikangosungunuka kwathunthu.
Katundu wosungunuka wa ma ether okhala ndi methylcellulose omwe amakonzedwa pamwamba
Kukonzekera kwa Hydroxyethyl Cellulose Ether Solution
Mankhwala a Hydroxyethyl cellulose ether (HEC) alibe mphamvu ya gelation yotentha, chifukwa chake, HEC yopanda mankhwala a pamwamba imapanganso ma agglomerate m'madzi otentha. Opanga nthawi zambiri amachita mankhwala a pamwamba pa HEC ya ufa kuti achedwetse kusungunuka, kuti ifalitsidwe mwachindunji m'madzi ozizira okhala ndi pH yosasunthika popanda kupanga ma agglomerate. Mofananamo, mu yankho lomwe lili ndi alkalinity yambiri, HEC Imathanso kupanga ma agglomerate chifukwa cha kutayika kwa kusungunuka mochedwa. Popeza simenti slurry ndi ya alkaline pambuyo pa hydration ndipo pH ya yankho ili pakati pa 12 ndi 13, kuchuluka kwa kusungunuka kwa cellulose ether yokonzedwa pamwamba mu simenti slurry nakonso ndi kofulumira kwambiri.
Katundu wosungunuka wa HEC wochiritsidwa pamwamba
Mapeto ndi Kusanthula
1. Njira yofalitsira
Pofuna kupewa zotsatirapo zoyipa pa nthawi yoyesera chifukwa cha kusungunuka pang'onopang'ono kwa zinthu zotsukira pamwamba, tikukulimbikitsani kugwiritsa ntchito madzi otentha pokonzekera.
2. Njira yozizira
Mayankho a ether a cellulose ayenera kusunthidwa ndikuzizidwa kutentha kozungulira kuti achepetse kuzizira, komwe kumafuna nthawi yayitali yoyesera.
3. Njira yosakaniza
Pambuyo poti ether ya cellulose yawonjezeredwa m'madzi otentha, onetsetsani kuti mukupitiriza kusakaniza. Kutentha kwa madzi kukatsika pansi pa kutentha kwa gel, ether ya cellulose imayamba kusungunuka, ndipo yankho lidzakhala lokhuthala pang'onopang'ono. Panthawiyi, liwiro losakaniza liyenera kuchepetsedwa. Mankhwalawa akafika pa kukhuthala kwina, amafunika kuyima kwa maola opitilira 10 thovu lisanayandikire pang'onopang'ono pamwamba kuti liphulike ndi kuzimiririka.
Mabulubu a Mpweya mu Cellulose Ether Solution
4. Njira yothira madzi
Ubwino wa ether ya cellulose ndi madzi uyenera kuyezedwa molondola, ndipo yesetsani kusadikira kuti yankho lifike pamlingo wapamwamba musanabwezeretse madzi.
5. Kuyesa kwa kukhuthala
Chifukwa cha thixotropy ya yankho la cellulose ether, poyesa kukhuthala kwake, rotor ya rotational viscometer ikalowetsedwa mu yankho, idzasokoneza yankho ndikukhudza zotsatira za muyeso. Chifukwa chake, rotor ikalowetsedwa mu yankho, iyenera kuloledwa kuyima kwa mphindi 5 isanayesedwe.
Nthawi yotumizira: Mar-22-2023