I-Cellulose ether iyi-polymer yokwenziwa eyenziwe nge-cellulose yemvelo ngokuguqulwa kwamakhemikhali.I-Cellulose ether iphuma ku-cellulose yemvelo.Ukukhiqizwa kwe-cellulose ether kuhlukile kuma-polymers okwenziwa.Impahla yayo eyisisekelo i-cellulose, isakhi se-polymer yemvelo.Ngenxa yemininingwane yesakhiwo se-cellulose yemvelo, i-cellulose ngokwayo ayinalo ikhono lokusabela nge-etherification agents.Kodwa-ke, ngemva kokwelashwa kwe-ejenti yokuvuvukala, izibopho eziqinile ze-hydrogen phakathi kwamaketanga amangqamuzana namaketanga ziyabhujiswa, futhi ukukhululwa okusebenzayo kweqembu le-hydroxyl kuba i-alkali cellulose esebenzayo.Thola i-cellulose ether.
Ngodaka olulungile lwengxube, inani elingeziwe le-cellulose ether liphansi kakhulu, kodwa lingathuthukisa kakhulu ukusebenza kodaka olumanzi, futhi liyisithasiselo esiyinhloko esithinta ukusebenza kokwakhiwa kodaka.Ukukhethwa okunengqondo kwama-cellulose ethers ezinhlobonhlobo ezahlukene, ama-viscosity ahlukene, ubukhulu bezinhlayiya ezihlukahlukene, amazinga ahlukene e-viscosity namanani angeziwe azoba nomthelela omuhle ekuthuthukiseni ukusebenza kwe-powder mortar.Njengamanje, ama-masonry amaningi kanye ne-plastering mortars anokusebenza kahle kokugcina amanzi, futhi udaka lwamanzi luzohlukana ngemva kwemizuzu embalwa yokuma.
Ukugcinwa kwamanzi kuwumsebenzi obalulekile we-methyl cellulose ether, futhi kuwumsebenzi abakhiqizi abaningi basekhaya bengxube eyomile yodaka, ikakhulukazi labo abasezifundeni eziseningizimu enamazinga okushisa aphezulu, banake.Izinto ezithinta umphumela wokugcina amanzi wodaka lwengxube eyomile zihlanganisa inani le-MC elingeziwe, i-viscosity ye-MC, ukucoleka kwezinhlayiya kanye nezinga lokushisa lendawo yokusetshenziswa.
Izici zama-cellulose ethers zincike ohlotsheni, inombolo nokusatshalaliswa kwezinto ezibambele.Ukuhlukaniswa kwe-cellulose ethers futhi kusekelwe ohlotsheni lwama-substitute, izinga le-etherification, ukuncibilika kanye nezakhiwo zesicelo ezihlobene.Ngokuya kohlobo lwama-substituent ochungechungeni lwemolekyuli, ingahlukaniswa ibe i-monoether ne-ether exutshiwe.I-MC esivame ukuyisebenzisa i-monoether, futhi i-HPMC iyi-ether exubile.I-Methyl cellulose ether MC iwumkhiqizo ngemuva kokuthi iqembu le-hydroxyl kuyunithi ye-glucose ye-cellulose yemvelo lithathelwe indawo yi-methoxy.Ifomula yesakhiwo ithi [COH7O2(OH)3-h(OCH3)h ]x.Ingxenye yeqembu le-hydroxyl kuyunithi ithathelwa indawo yiqembu le-methoxy, futhi enye ingxenye ithathelwa indawo iqembu le-hydroxypropyl, ifomula yesakhiwo ithi [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3] n] x I-Ethyl methyl cellulose ether HEMC, lezi izinhlobo eziyinhloko ezisetshenziswa kakhulu futhi ezithengiswa emakethe.
Ngokuya nge-solubility, ingahlukaniswa ibe yi-ionic ne-non-ionic.Ama-ether e-non-ionic cellulose ancibilika emanzini akhiwa ikakhulukazi uchungechunge olubili lwama-alkyl ether nama-hydroxyalkyl ether.I-Ionic CMC isetshenziswa kakhulu ezintweni zokwenziwa zokuhlanza, ukuphrinta izindwangu nokudaya, ukuhlola ukudla nowoyela.I-Non-ionic MC, i-HPMC, i-HEMC, njll. isetshenziswa ikakhulukazi ezintweni zokwakha, i-latex coatings, imithi, amakhemikhali ansuku zonke, njll. Isetshenziswa njenge-thickener, i-ejenti yokugcina amanzi, i-stabilizer, i-dispersant kanye ne-ejenti eyenza ifilimu.
Ukugcinwa kwamanzi kwe-cellulose ether: Ekukhiqizeni izinto zokwakha, ikakhulukazi udaka lwempuphu eyomile, i-cellulose ether idlala indima engenakushintshwa, ikakhulukazi ekukhiqizeni udaka olukhethekile (udaka oluguquliwe), luyingxenye ebalulekile futhi ebalulekile .Iqhaza elibalulekile le-ether cellulose encibilika emanzini odakeni ikakhulukazi linezici ezintathu:
1. Umthamo omuhle kakhulu wokugcina amanzi
2. Umphumela wokungaguquguquki kodaka kanye ne-thixotropy
3. Ukusebenzisana nosimende.
Umphumela wokugcina amanzi we-cellulose ether uncike ekumunceni kwamanzi kwesendlalelo sesisekelo, ukwakheka kodaka, ukujiya kongqimba lodaka, isidingo samanzi sodaka, kanye nesikhathi sokusetha sendawo yokusetha.Ukugcinwa kwamanzi kwe-cellulose ether ngokwayo kuvela ekuncibilikeni nasekuphelelweni kwamanzi emzimbeni kwe-cellulose ether ngokwayo.Njengoba sonke sazi, nakuba iketanga lamangqamuzana e-cellulose liqukethe inani elikhulu lamaqembu e-OH ane-hydratable, ayincibiliki emanzini, ngoba isakhiwo se-cellulose sinezinga eliphezulu le-crystallinity.Amandla okukhipha amanzi emaqenjini e-hydroxyl ewodwa akwanele ukumboza amabhondi e-hydrogen aqinile namandla e-van der Waals phakathi kwama-molecule.Ngakho-ke, iyavuvukala kuphela kodwa ayincibiliki emanzini.Lapho enye indawo yethulwa ochungechungeni lwamangqamuzana, akugcini nje kuphela ukuthi okungene esikhundleni kucekela phansi iketango le-hydrogen, kodwa futhi isibopho se-hydrogen se-interchain siyabhujiswa ngenxa yokuhlangana kwento ebambele phakathi kwamaketanga aseduze.Uma i-substitute inkulu, ibanga eliphakathi kwama-molecule liba likhulu.Ibanga elikhulu.Umphumela omkhulu wokucekela phansi izibopho ze-hydrogen, i-cellulose ether iyancibilika emanzini ngemva kokuba i-cellulose lattice yanda futhi isisombululo singena, sakha isisombululo se-viscosity ephezulu.Lapho izinga lokushisa likhuphuka, i-hydration ye-polymer iba buthaka, futhi amanzi phakathi kwamaketanga axoshwa.Lapho umphumela wokuphelelwa amanzi emzimbeni wanele, ama-molecule aqala ukuhlanganisa, enze ijeli yesakhiwo senethiwekhi enezinhlangothi ezintathu futhi ahlanganiswe.
Isikhathi sokuthumela: Dec-06-2022