Kusimende esihlanganisiwe esilungisiwe, isikhathi eside njengesikhashanai-cellulose etherkungathuthukisa kakhulu ukusebenza kwe-mortar emanzi, kungabonakala ukuthi i-cellulose ether iyisengezo esiyinhloko esithinta ukusebenza kokwakhiwa kwe-mortar.
Ukukhethwa kwezinhlobo ezahlukene, ukuqina okuhlukile, ubukhulu bezinhlayiya ezahlukene, amazinga ahlukene e-viscosity kanye nokwengezwa kwama-ether e-cellulose nakho kunemiphumela ehlukene ekuthuthukisweni kokusebenza kwe-dry powder mortar. Njengamanje, ama-mortar amaningi okwakha ngobumba kanye nokufaka i-plaster anamandla okugcina amanzi, futhi i-slurry yamanzi izohlukana ngemva kwemizuzu embalwa yokuma. Ngakho-ke kubaluleke kakhulu ukwengeza i-cellulose ether ku-cement mortar.
ukugcinwa kwamanzi
Ukugcinwa kwamanzi kuwukusebenza okubalulekile kwe-methyl cellulose ether, futhi kungukusebenza okunakwa kakhulu ngabakhiqizi abaningi be-dry-mix mortar basekhaya, ikakhulukazi labo abasezindaweni eziseningizimu ezinamazinga okushisa aphezulu.
Ekukhiqizweni kwezinto zokwakha, ikakhulukazi udaka oluyimpuphu eyomile, i-cellulose ether idlala indima engenakuphindwa, ikakhulukazi ekukhiqizweni kodaka olukhethekile (udaka oluguquliwe), luyinto ebalulekile futhi ebalulekile.
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 angaphansi kwamandla aqinile okubopha, ngaleyo ndlela akhe amanzi akhululekile, amanzi aboshwe, futhi athuthukise ukugcinwa kwamanzi kwe-cement slurry; i-cellulose ether ithuthukisa i-cement slurry entsha Izakhiwo ze-rheological, isakhiwo senethiwekhi enezimbobo kanye nengcindezi ye-osmotic noma izakhiwo zokwakha ifilimu ze-cellulose ether zivimbela ukusabalala kwamanzi.
ukuqina kanye ne-thixotropy
I-ether ye-celluloseInika udoti omanzi i-viscosity enhle kakhulu, okungakhulisa kakhulu ikhono lokubopha phakathi kodoti omanzi kanye nesendlalelo sesisekelo, futhi kuthuthukise ukusebenza kodoti okuvimbela ukugoba. Isetshenziswa kabanzi ekuplasteni udoti, udoti wokubopha izitini kanye nohlelo lokuvikela udonga lwangaphandle. Umphumela wokujiya we-cellulose ether ungakhulisa nekhono lokulwa nokuhlakazeka kanye nokulingana kwezinto ezisanda kuhlanganiswa, kuvimbele ukuhlukana kwezinto, ukuhlukaniswa kanye nokopha, futhi kungasetshenziswa kukhonkolo yefayibha, kukhonkolo engaphansi kwamanzi kanye nakonkolonti ozicindezelayo.
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.
Isixazululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, okuyisici esiyinhloko se-cellulose ether. Izixazululo zamanzi ze-methyl cellulose zivame ukuba ne-pseudoplastic kanye ne-non-thixotropic fluidity ngaphansi kokushisa kwejeli yayo, 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-gel esakhiwo akhiwa lapho izinga lokushisa liphakanyiswa, futhi kwenzeka ukugeleza kwe-thixotropic ephezulu.
Ama-ether e-cellulose anezinga eliphezulu kanye nezinga eliphansi le-viscosity abonisa i-thixotropy ngisho nangaphansi kwezinga lokushisa lejeli. Lesi sici siwusizo olukhulu ekulungisweni kokulevelisha nokugoba ekwakhiweni kwe-mortar yokwakha. Kudingeka kuchazwe lapha ukuthi uma i-viscosity ye-cellulose ether iphakeme, ukugcinwa kwamanzi kungcono, kodwa uma i-viscosity iphakeme, isisindo sama-molecule se-cellulose ether siphakeme, kanye nokwehla okuhambisanayo kokuncibilika kwayo, okunomthelela omubi ekugxilweni kwe-mortar kanye nokusebenza kokwakhiwa.
Ukungena emoyeni
I-Cellulose ether inomphumela osobala wokungenisa umoya ezintweni ezintsha ezisekelwe kusimende. I-Cellulose ether inamaqembu athanda amanzi (amaqembu e-hydroxyl, amaqembu e-ether) kanye namaqembu athanda amanzi (amaqembu e-methyl, amasongo e-glucose), futhi iyi-surfactant enomsebenzi wobuso, ngaleyo ndlela inomphumela wokungenisa umoya. Umphumela wokungenisa umoya we-cellulose ether uzokhiqiza umphumela "webhola", ongathuthukisa ukusebenza kwezinto ezisanda kuhlanganiswa, njengokwandisa i-plasticity kanye nokushelela kwe-mortar ngesikhathi sokusebenza, okusiza ekusabalaleni kwe-mortar; izophinde ikhulise umkhiqizo we-mortar, inciphise izindleko zokukhiqiza i-mortar; kodwa izokwandisa i-porosity yezinto eziqinile futhi inciphise izakhiwo zayo zemishini njengamandla kanye ne-elastic modulus.
Njenge-surfactant, i-cellulose ether nayo inomphumela wokumanzisa noma wokugcoba ezinhlayiyeni zesimende, okwandisa ukugeleza kwezinto ezisekelwe kusimende kanye nomphumela wayo wokungenisa umoya, kodwa umphumela wayo wokuqina uzonciphisa ukugeleza. Umphumela wokugeleza uwukuhlanganiswa kwemiphumela yokwenza ipulasitiki kanye nokuqina. Ngokuvamile, lapho okuqukethwe kwe-cellulose ether kuphansi kakhulu, ukusebenza okuyinhloko ukwenziwa ipulasitiki noma ukunciphisa amanzi; lapho okuqukethwe kuphakeme, umphumela wokuqina we-cellulose ether uyanda ngokushesha, futhi umphumela wayo wokungenisa umoya uvame ukugcwala. Ngakho-ke kubonakala njengomphumela wokuqina noma ukwanda kwesidingo samanzi.
ukubambezeleka
I-ether ye-cellulosekuzokwandisa isikhathi sokusetha i-paste noma i-mortar yesimende, futhi kubambezele ukuhamba kwamanzi kwesimende, okuzuzisa ukuthuthukisa isikhathi sokusebenza kwezinto ezisanda kuhlanganiswa, kuthuthukise ukuhambisana kwesimende kanye nokulahlekelwa ukwehla kwekhonkrithi ngokuhamba kwesikhathi, kodwa futhi kungabangela ukubambezeleka kokwakhiwa.
Isikhathi sokuthunyelwe: Ephreli-25-2024