I-ether ye-celluloseinokugcinwa kwamanzi okuhle kakhulu, okungavimbela umswakama ku-mortar emanzi ukuthi ingahwamuki ngaphambi kwesikhathi noma imuncwe ungqimba lwesisekelo, futhi kuqinisekiswe ukuthi usimende umanzi ngokuphelele, ngaleyo ndlela ekugcineni kuqinisekiswe izakhiwo zemishini ze-mortar, ezizuzisa kakhulu izingqimba zesisekelo ze-mortar ezinciphile kanye nezingqimba ezimunca amanzi Noma i-mortar eyakhiwe ngaphansi kwezimo zokushisa okuphezulu nezomile. Umphumela wokugcina amanzi we-cellulose ether ungashintsha inqubo yokwakha yendabuko futhi uthuthukise inqubekela phambili yokwakha. Isibonelo, ukwakhiwa kwe-plaster kungenziwa ezindaweni ezimunca amanzi ngaphandle kokumanzisa kusengaphambili.
I-viscosity, umthamo, izinga lokushisa elizungezile kanye nesakhiwo sama-molecule se-cellulose ether kunethonya elikhulu ekusebenzeni kwayo kokugcinwa kwamanzi. Ngaphansi kwezimo ezifanayo, lapho i-viscosity ye-cellulose ether inkulu, ukugcinwa kwamanzi kuba ngcono; lapho umthamo uphakeme, ukugcinwa kwamanzi kuba ngcono. Ngokuvamile, inani elincane le-cellulose ether lingathuthukisa kakhulu ukugcinwa kwamanzi kwe-mortar. Lapho umthamo ufinyelela ku-isilinganiso esithile Lapho izinga lokugcinwa kwamanzi landa, umkhuba wezinga lokugcinwa kwamanzi uyehla; lapho izinga lokushisa elizungezile likhuphuka, ukugcinwa kwamanzi kwe-cellulose ether kuvame ukwehla, kodwa amanye ama-cellulose ether aguquliwe nawo anokugcinwa kwamanzi okungcono ngaphansi kwezimo zokushisa okuphezulu; imicu enezinga eliphansi lokushintshaniswa kwe-Vegan ether inokusebenza okungcono kokugcinwa kwamanzi.
Iqembu le-hydroxyl elise-molecule ye-cellulose ether kanye ne-athomu ye-oxygen ebond ye-ether kuzohlangana ne-molecule yamanzi ukuze kwakheke i-hydrogen bond, kuguqule amanzi akhululekile abe ngamanzi aboshwe, ngaleyo ndlela kudlala indima enhle ekugcinweni kwamanzi; i-molecule yamanzi kanye ne-cellulose ether molecular chain Interdiffusion ivumela ama-molecule amanzi ukuthi angene ngaphakathi kwe-cellulose ether macromolecular chain futhi ingaphansi kwamandla aqinile okubopha, ngaleyo ndlela yakhe amanzi aboshwe kanye namanzi aboshwe, okuthuthukisa ukugcinwa kwamanzi kwe-cement slurry; i-cellulose ether ithuthukisa i-cement slurry entsha. Izakhiwo ze-rheological, isakhiwo senethiwekhi evuvukele kanye nengcindezi ye-osmotic noma izakhiwo zokwakha ifilimu ze-cellulose ether zivimbela ukusabalala kwamanzi.
I-cellulose ether inika i-mortar emanzi i-viscosity enhle kakhulu, engakhulisa kakhulu ikhono lokubopha phakathi kwe-mortar emanzi kanye nesendlalelo sesisekelo, futhi ithuthukise ukusebenza kwe-mortar evimbela ukugoba. Isetshenziswa kabanzi ekuplasteni i-mortar, i-mortar ebopha izitini kanye nohlelo lokuvikela udonga lwangaphandle. Umphumela wokujiya we-cellulose ether ungakhulisa nekhono lokulwa nokuhlakazeka kanye nokulingana kwezinto ezisanda kuhlanganiswa, ukuvimbela ukuhlukaniswa kwezinto, ukuhlukaniswa kanye nokopha, futhi ingasetshenziswa kukhonkolo yefayibha, kukhonkolo engaphansi kwamanzi kanye nakonkolonkolo oyazicindezelayo.
Umphumela wokujiya kwe-cellulose ether ezintweni ezisekelwe kusimende uvela ekujiya kwesisombululo se-cellulose ether. Ngaphansi kwezimo ezifanayo, lapho i-viscosity ye-cellulose ether iphakeme, i-viscosity yezinto ezisekelwe kusimende eziguquliwe iba ngcono, kodwa uma i-viscosity iphezulu kakhulu, izothinta ukujiya nokusebenza kwezinto (njengokunamathisela ummese wokuplasta). I-mortar ezilinganisayo kanye ne-concrete ezizihlanganisayo, ezidinga ukujiya okuphezulu, zidinga ukujiya okuphansi kwe-cellulose ether. Ngaphezu kwalokho, umphumela wokujiya we-cellulose ether uzokwandisa isidingo samanzi sezinto ezisekelwe kusimende futhi wandise isivuno se-mortar.
Ukuqina kwesisombululo se-cellulose ether kuncike kulezi zici ezilandelayo: isisindo sama-molecule se-cellulose ether, ukuhlushwa, izinga lokushisa, izinga lokucheba kanye nendlela yokuhlola. Ngaphansi kwezimo ezifanayo, lapho isisindo sama-molecule se-cellulose ether sikhulu, kulapho i-viscosity yesisombululo iphakama khona; lapho ukuhlushwa kuphakeme, kulapho i-viscosity yesisombululo iphakama khona. Uma uyisebenzisa, kufanele kuqashelwe ukugwema umthamo oweqile futhi kuthinte ukusebenza kwe-mortar kanye nekhonkrithi; i-cellulose ether Ukuqina kwesisombululo se-ether kuzoncipha ngokwanda kwezinga lokushisa, futhi lapho ukuhlushwa kuphakeme, kulapho ithonya lokushisa liba likhulu khona; isixazululo se-cellulose ether ngokuvamile siwuketshezi lwe-pseudoplastic olunempahla yokunciphisa ukucheba, lapho izinga lokucheba liba likhulu ngesikhathi sokuhlolwa, kulapho i-viscosity iba ncane khona, ngakho-ke, ukuqina kwe-mortar kuzoncipha ngaphansi kwesenzo samandla angaphandle, okuzuzisa ekwakhiweni kokuklwebheka kwe-mortar, ukuze i-mortar ibe nokusebenza kahle kanye nokuhlangana ngesikhathi esifanayo; ngoba isixazululo se-cellulose ether asiyona i-Newtonian. Kuma-fluids, lapho izindlela zokuhlola, izinsimbi kanye nemishini noma izindawo zokuhlola ezisetshenziswa ukuhlola i-viscosity zihlukile, imiphumela yokuhlolwa kwesisombululo se-cellulose ether esifanayo izohluka kakhulu.
Ama-molecule e-cellulose ether angalungisa amanye ama-molecule amanzi ezinto ezintsha emngceleni wochungechunge lwama-molecule, ngaleyo ndlela andise i-viscosity yesisombululo. Amaketanga ama-molecule e-cellulose ether axhumene ukuze akhe isakhiwo senethiwekhi esinezinhlangothi ezintathu, okuzokwenza futhi isisombululo sayo samanzi sibe ne-viscosity enhle.
Isixazululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, okuyisici esiyinhloko se-cellulose ether.i-methyl cellulosengokuvamile zine-pseudoplastic kanye ne-non-thixotropic fluidity ngaphansi kwezinga lokushisa lejeli layo, kodwa zibonisa izakhiwo zokugeleza kwe-Newtonian ngamanani aphansi okushefa. I-pseudoplasticity iyanda ngesisindo sama-molecule noma ukuhlushwa kwe-cellulose ether, kungakhathaliseki uhlobo lwe-substituent kanye nezinga lokushintsha. Ngakho-ke, ama-cellulose ethers ebanga elifanayo le-viscosity, kungakhathaliseki ukuthi i-mc, i-HPmc, i-HEmc, azohlala ebonisa izakhiwo ezifanayo ze-rheological inqobo nje uma ukuhlushwa kanye nokushisa kugcinwa kungaguquguquki. Ama-gels esakhiwo akhiwa lapho izinga lokushisa liphakanyiswa, futhi kwenzeka ukugeleza kwe-thixotropic okuphezulu. Ama-cellulose ethers e-viscosity ephezulu kanye ne-viscosity ephansi abonisa i-thixotropy ngisho nangaphansi kwezinga lokushisa lejeli. Le mpahla inenzuzo enkulu ekulungisweni kokuleveli kanye nokugoba ekwakhiweni kwe-mortar yokwakha. Kudingeka kuchazwe lapha ukuthi lapho i-viscosity ye-cellulose ether iphakeme, kuba ngcono ukugcinwa kwamanzi, kodwa lapho i-viscosity iphakeme, isisindo sama-molecule se-cellulose ether siphakeme, kanye nokwehla okuhambisanayo kokuncibilika kwayo, okunomthelela omubi ekuhlushweni kwe-mortar kanye nokusebenza kokwakhiwa. Uma i-viscosity iphakeme, kulapho umphumela wokujiya ubonakala khona ku-mortar, kodwa awulingani ngokuphelele. I-viscosity ethile ephakathi nephansi, kodwa i-modified cellulose ether isebenza kangcono ekuthuthukiseni amandla esakhiwo se-mortar emanzi. Ngokukhula kwe-viscosity, ukugcinwa kwamanzi kwe-cellulose ether kuyathuthuka.
Isikhathi sokuthunyelwe: Ephreli-28-2024