Odakeni oseluxubile, i-ether encane ye-cellulose kuphela engathuthukisa kakhulu ukusebenza kodaka olumanzi.Kungabonakala ukuthi i-cellulose ether iyisengezo esiyinhloko esithinta ukusebenza kodaka.
Ukukhetha izinhlobo ezahlukene ze-cellulose ethers ezinama-viscosity ahlukene, ubukhulu bezinhlayiya ezihlukene, amazinga ahlukene we-viscosity namanani angeziwe kuzoba nemiphumela ehlukene ekuthuthukiseni ukusebenza kwe-drymix mortar.Njengamanje, udaka oluningi lwamatshe kanye nodaka lunomsebenzi ongemuhle wokugcina amanzi.Amanzi ne-slurry kuzohlukana ngemva kwemizuzu embalwa yokuma.Ngakho-ke kubaluleke kakhulu ukwengeza i-cellulose ether odakeni lukasimende.
Ake sihlolisise indima ye-cellulose ether odakeni lukasimende!
1. I-Cellulose ether--Ukugcinwa kwamanzi
Ukugcinwa kwamanzi kuwumsebenzi obalulekile we-methyl cellulose ether, futhi kuwumsebenzi abakhiqizi abaningi basekhaya bengxube yodaka eyomile, ikakhulukazi labo abasezifundeni eziseningizimu enamazinga okushisa aphezulu anaka.Ekukhiqizeni izinto zokwakha, ikakhulukazi udaka lwempuphu eyomile, i-cellulose ether idlala indima engenakushintshwa, ikakhulukazi ekukhiqizeni udaka olukhethekile (udaka oluguquliwe), luyingxenye ebalulekile futhi ebalulekile.
I-viscosity, umthamo, izinga lokushisa elizungezile kanye nesakhiwo samangqamuzana e-cellulose ether kunomthelela omkhulu ekusebenzeni kwayo kokugcinwa kwamanzi.Ngaphansi kwezimo ezifanayo, i-viscosity enkulu ye-cellulose ether, ukugcinwa kwamanzi kangcono;Uma umthamo uphezulu, kuba ngcono ukugcinwa kwamanzi.Ngokuvamile, isilinganiso esincane se-cellulose ether singathuthukisa kakhulu ukugcinwa kwamanzi odaka.Uma umthamo ufinyelela kokuthile, lapho izinga lokugcinwa kwamanzi likhuphuka, inkambiso yezinga lokugcinwa kwamanzi iyancipha;Lapho izinga lokushisa le-ambient likhuphuka, ukugcinwa kwamanzi kwe-cellulose ether ngokuvamile kuyehla.Kodwa amanye ama-cellulose ethers ashintshiwe nawo anokugcinwa kwamanzi okungcono ngaphansi kwezimo eziphakeme zokushisa;I-cellulose ether enamadigri aphansi okushintsha inokusebenza okungcono kokugcinwa kwamanzi.
Iqembu le-hydroxyl ku-cellulose ether molecule kanye ne-athomu ye-oksijini ku-ether bond izohlotshaniswa ne-molecule yamanzi ukuze yakhe isibopho se-hydrogen, iguqule amanzi amahhala abe amanzi abophekile, ngaleyo ndlela idlala indima enhle ekugcineni amanzi;Ii-molecule yamanzi kanye ne-cellulose ether molecular chain I-Interdiffusion ivumela ama-molecule amanzi ukuthi angene ngaphakathi kweketango le-cellulose ether macromolecular futhi angaphansi kwamandla aqinile okubopha, ngaleyo ndlela akhe amanzi amahhala, amanzi abanjwe, futhi athuthukise ukugcinwa kwamanzi odaka lukasimende;I-Cellulose ether ithuthukisa izici ze-rheological zikasimende omusha, ukwakheka kwenethiwekhi enezimbotshana kanye nengcindezi ye-osmotic noma izakhiwo zefilimu ze-cellulose ether zivimbela ukusakazeka kwamanzi.
2. Cellulose ethers - Thickening and Thixotropy
I-Cellulose ether inika udaka olumanzi nge-viscosity enhle kakhulu, engakhuphula kakhulu ikhono lokubopha phakathi kodaka olumanzi kanye nongqimba oluyisisekelo, futhi ithuthukise ukusebenza kwe-anti-sag yodaka.Isetshenziswa kabanzi ekwenzeni udaka, udaka lokuhlanganisa izitini kanye nohlelo lokufakwa kwezindonga lwangaphandle.Umthelela wokujiya we-cellulose ether ungase futhi ukhuphule ikhono lokulwa nokuhlakazeka kanye nokufana kwezinto ezisanda kuxutshwa, kuvimbele ukuhlukaniswa kwezinto kanye nokuhlukaniswa.Ingasetshenziswa ku-fiber concrete, ukhonkolo ongaphansi kwamanzi kanye nokhonkolo ozihlanganisayo.
Umthelela wokujiya we-cellulose ether ezintweni ezisekelwe kusimende uvela ku-viscosity yesisombululo se-cellulose ether.Ngaphansi kwezimo ezifanayo, ukuphakama kwe-viscosity ye-cellulose ether, kuba ngcono i-viscosity yezinto ezisekelwe kusimende ezishintshiwe, kodwa uma i-viscosity iphezulu kakhulu, izophazamisa uketshezi nokusebenza kwempahla (njengokunamathisela ummese wokuplasta. ).Udaka oluzilinganisa kanye nokhonkolo ozihlanganisayo, oludinga uketshezi oluningi, ludinga i-viscosity ephansi ye-cellulose ether.Ngaphezu kwalokho, umphumela wokujiya we-cellulose ether uzokwandisa isidingo samanzi sezinto ezisekelwe kusimende futhi ukwandise isivuno sodaka.
Isixazululo samanzi se-cellulose ether se-high-viscosity sine-thixotropy ephezulu, okubuye kube isici esikhulu se-cellulose ether.Izixazululo ezinamanzi ze-methyl cellulose ngokuvamile zine-pseudoplastic kanye ne-non-thixotropic fluidity ngaphansi kwezinga lokushisa lejeli, kodwa zibonisa izakhiwo zokugeleza kwe-Newtonian ngamanani aphansi e-shear.I-Pseudoplasticity iyanda ngesisindo se-molecular noma ukugxila kwe-cellulose ether, kungakhathaliseki ukuthi hlobo luni lwe-substitute kanye nezinga lokushintsha.Ngakho-ke, ama-cellulose ethers webanga elifanayo le-viscosity, kungakhathaliseki ukuthi i-HPMC noma i-HEMC, azohlala ebonisa izici ezifanayo ze-rheological inqobo nje uma ukugxila nokushisa kugcinwa njalo.Ama-gel esakhiwo akhiwa lapho izinga lokushisa liphakanyiswa, futhi ukugeleza kwe-thixotropic kakhulu kwenzeka.
I-concentration ephezulu kanye ne-viscosity ephansi ye-cellulose ethers ibonisa i-thixotropy ngisho nangaphansi kwezinga lokushisa le-gel.Lesi sakhiwo sinenzuzo enkulu ekulungisweni kokulinganisa nokuwohloka ekwakhiweni kodaka lokwakha.Kudingeka kuchazwe lapha ukuthi ukuphakama kwe-viscosity ye-cellulose ether, ukugcinwa kwamanzi kangcono, kodwa ukuphakama kwe-viscosity, ukuphakama kwesisindo samangqamuzana e-cellulose ether, kanye nokuncipha okuhambisanayo kokuncibilika kwayo, okunomthelela omubi. ekugxilweni kodaka nokusebenza kokwakhiwa.
3. I-Cellulose ether - Umphumela wokungenisa umoya
I-Cellulose ether inomphumela osobala wokufaka umoya ezintweni ezintsha ezisekelwe kusimende.I-Cellulose ether inawo womabili amaqembu e-hydrophilic (amaqembu e-hydroxyl, amaqembu e-ether) kanye namaqembu e-hydrophobic (amaqembu e-methyl, izindandatho ze-glucose), futhi iyi-surfactant enomsebenzi ongaphezulu, ngaleyo ndlela ibe nomthelela wokungenisa umoya.Umphumela wokungenisa umoya we-cellulose ether uzoveza umphumela "webhola", ongathuthukisa ukusebenza kwezinto ezisanda kuhlanganiswa, njengokwandisa ipulasitiki kanye nokushelela kodaka ngesikhathi sokusebenza, okulungele ukusabalalisa udaka. ;kuzophinde kwandise ukukhishwa kwe-mortar, ukunciphisa izindleko zokukhiqiza udaka;kodwa izokwandisa i-porosity yezinto eziqinile futhi inciphise izakhiwo zayo zemishini njengamandla kanye ne-elastic modulus.
Njenge-surfactant, i-cellulose ether iphinde ibe nomthelela wokumanzisa noma wokugcoba ezinhlayiyeni zikasimende, okwandisa uketshezi lwezinto ezisekelwe kusimende kanye nomthelela wayo wokungenisa umoya, kodwa umphumela wawo wokujiya uzonciphisa uketshezi.Umphumela we-fluidity uyinhlanganisela ye-plasticizing kanye nemiphumela yokuqina.Ngokuvamile, lapho okuqukethwe kwe-cellulose ether kuphansi kakhulu, ukusebenza okuyinhloko kuyi-plasticization noma ukunciphisa amanzi;lapho okuqukethwe kuphezulu, umphumela wokujiya we-cellulose ether ukhula ngokushesha, futhi umphumela wawo wokungenisa umoya uvame ukugcwala.Ngakho-ke kubonisa njengomphumela wokuqina noma ukwanda kwesidingo samanzi.
4. I-Cellulose Ether - Ukukhubazeka
I-Cellulose ether izokwandisa isikhathi sokusetha sokunamathisela usimende noma udaka, futhi ibambezele i-hydration kinetics kasimende, okuzuzisa ukuthuthukisa isikhathi sokusebenza sezinto ezisanda kuxutshwa, ukuthuthukisa ukungaguquguquki kodaka kanye nokulahlekelwa ukuwohloka kukakhonkolo ngokuhamba kwesikhathi, kodwa kungase futhi kubangele ukubambezeleka kwenqubekelaphambili yokwakha.
Isikhathi sokuthumela: Jun-02-2023