I-cellulose ether ingathuthukisa kakhulu ukusebenza kodaka olumanzi, futhi iyisengezo 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 we-powder mortar eyomile zihlanganisa inani lokungezwa, i-viscosity, ukucoleka kwezinhlayiya, nezinga lokushisa lendawo yokusetshenziswa.
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. Indima ebalulekile ye-ether ye-cellulose encibilikayo emanzini ikakhulukazi inezici ezintathu, eyodwa iwumthamo omuhle kakhulu wokugcinwa kwamanzi, enye ithonya lokungaguquguquki kanye ne-thixotropy yodaka, kanti okwesithathu ukuxhumana 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.
Ngokuvamile, ukuphakama kwe-viscosity, kuba ngcono umphumela wokugcina amanzi. Kodwa-ke, ukuphakama kwe-viscosity futhi ukuphakama kwesisindo samangqamuzana, ukwehla okuhambisanayo kokuncibilika kwawo kuzoba nomthelela omubi emandleni nokusebenza kokwakhiwa kodaka. Ukuphakama kwe-viscosity, kusobala kakhulu umphumela wokuqina odongeni, kodwa awulingani ngokuqondile. Ukuphakama kwe-viscosity, i-viscous yodaka olumanzi luyoba ngaphezulu, okungukuthi, ngesikhathi sokwakhiwa, kubonakala njengokunamathela ku-scraper nokunamathela okuphezulu ku-substrate. Kodwa akusizi ukwandisa amandla esakhiwo sodaka olumanzi ngokwalo. Ngesikhathi sokwakhiwa, ukusebenza kwe-anti-sag akubonakali. Ngokuphambene, i-viscosity ethile emaphakathi nephansi kodwa eshintshiwe ye-methyl cellulose ethers inokusebenza okuhle kakhulu ekuthuthukiseni amandla esakhiwo sodaka olumanzi.
Ukuqina kanye Thixotropy yeCellulose Ether
Kuphinde kube nobudlelwano obuhle bomugqa phakathi kokuvumelana kokunamathisela usimende kanye nomthamo we-cellulose ether. I-cellulose ether ingakhuphula kakhulu i-viscosity yodaka. Uma umthamo umkhulu, umphumela uba sobala kakhulu. Isixazululo se-aqueous cellulose cellulose ether esine-high-viscosity sine-thixotropy ephezulu, ephinde ibe yisici esikhulu se-cellulose ether.
Ukuqina kuncike ezingeni le-polymerization ye-cellulose ether, ukuhlushwa kwesisombululo, izinga le-shear, izinga lokushisa nezinye izimo. Impahla ye-gelling yesisombululo ihlukile ku-alkyl cellulose kanye nokuphuma kwayo okuguquliwe. Izakhiwo ze-gelation zihlobene nezinga lokushintshwa, ukugxila kwesisombululo kanye nezithasiselo. Kokuphuma kokunye okuguquliwe kwe-hydroxyalkyl, izakhiwo zejeli nazo zihlobene nezinga lokuguqulwa le-hydroxyalkyl. Ukuze uthole i-viscosity ephansi ye-MC ne-HPMC, isisombululo se-10% -15% singalungiswa, i-viscosity ephakathi kwe-MC ne-HPMC ingalungiswa isixazululo esingu-5% -10%, kuyilapho i-viscosity ephezulu ye-MC ne-HPMC ingalungisa kuphela isixazululo esingu-2% -3%, futhi Ngokuvamile ukuhlukaniswa kwe-viscosity ye-cellulose ether nayo ihlelwe ngesisombululo se-1% -2%. I-high molecular weight cellulose ether ine-high thickening ukusebenza kahle. Esixazululweni esifanayo sokuhlushwa, ama-polymer anesisindo samangqamuzana ahlukene anama-viscosity ahlukene. Izinga eliphezulu. I-viscosity ehlosiwe ingafinyelelwa kuphela ngokungeza inani elikhulu lesisindo esiphansi se-cellulose ether. I-viscosity yayo inokwencika okuncane kuzinga lokugunda, futhi i-viscosity ephezulu ifinyelela i-viscosity ehlosiwe, futhi inani elidingekayo lokwengeza lincane, futhi i-viscosity incike ekusebenzeni kahle kokuqina. Ngakho-ke, ukuze kuzuzwe ukuvumelana okuthile, inani elithile le-cellulose ether (ukugxila kwesisombululo) kanye ne-viscosity yesisombululo kufanele kuqinisekiswe. Izinga lokushisa lejeli lesisombululo liphinde linciphise ngokuhambisana nokwanda kokuhlushwa kwesisombululo, nama-gel ekamelweni lokushisa ngemva kokufinyelela ekugxilweni okuthile. I-concentration ye-gelling ye-HPMC iphezulu uma kuqhathaniswa nezinga lokushisa legumbi.
Ukuncipha kwe-Cellulose Ether
Umsebenzi wesithathu we-cellulose ether uwukubambezeleka kwenqubo yokugeleza kukasimende. I-cellulose ether inika udaka olunezinto ezihlukahlukene ezizuzisayo, futhi inciphisa ukushisa kwangaphambi kwesikhathi kwe-hydration kasimende futhi ibambezele inqubo ye-hydration ashukumisayo kasimende. Lokhu akulungile ukusetshenziswa kodaka ezindaweni ezibandayo. Lo mphumela wokuvinjelwa ubangelwa ukukhangisa kwama-molecule e-cellulose ether emikhiqizweni ye-hydration efana ne-CSH ne-ca(OH)2. Ngenxa yokwanda kwe-viscosity yesisombululo se-pore, i-cellulose ether inciphisa ukuhamba kwama-ion esixazululweni, ngaleyo ndlela ibambezele inqubo ye-hydration. Uma uphezulu ukugcwala kwe-cellulose ether kujeli yamaminerali, kulapho ubonakala khona umphumela wokubambezeleka kokufakwa kwamanzi. I-Cellulose ether ayilibazisi nje kuphela ukusetha, kodwa futhi ibambezela inqubo yokuqina yesistimu yodaka lukasimende. Umphumela wokuvinjelwa kwe-cellulose ether awuncikile kuphela ekugxilweni kwayo ohlelweni lwejeli yamaminerali, kodwa futhi nesakhiwo samakhemikhali. Ukuphakama kwezinga le-methylation ye-HEMC, kuba ngcono umphumela wokuvinjelwa kwe-cellulose ether. Isilinganiso sokushintshwa kwe-hydrophilic esikhundleni sokwandisa amanzi Umphumela wokuhlehlisa unamandla. Kodwa-ke, i-viscosity ye-cellulose ether ayinawo umthelela omncane ku-simende hydration kinetics.
Esakhiweni, i-cellulose ether idlala indima yokugcina amanzi, ukuqina, ukubambezeleka kwamandla kasimende, kanye nokwenza ngcono ukusebenza komsebenzi wokwakha. Umthamo omuhle wokugcina amanzi wenza ukugeleza kukasimende kuphelele, kungathuthukisa i-viscosity emanzi yodaka olumanzi, kukhuphule amandla okubopha odaka, futhi kulungise isikhathi. Ukwengeza i-cellulose ether kudaka lokufafaza lomshini kungathuthukisa ukusebenza kokufuthwa noma ukumpompa namandla esakhiwo sodaka. Ngakho-ke, i-cellulose ether isetshenziswa kabanzi njengesengezo esibalulekile odakeni oluxubile
Isikhathi sokuthumela: Dec-26-2022