Ukukhethwa kwezinhlobonhlobo ezihlukahlukene, ama-viscosity ahlukene, ubukhulu bezinhlayiya ezahlukene, amazinga ahlukene we-viscosity kanye nokwengezwa kwe-cellulose ethers nakho kunemiphumela ehlukene ekuthuthukiseni ukusebenza kwe-powder mortar eyomile. Njengamanje, ama-masonry amaningi kanye ne-plastering mortars anokusebenza kahle kokugcina amanzi, futhi udaka lwamanzi luzohlukana ngemva kwemizuzu embalwa yokuma. Ngakho-ke kubaluleke kakhulu ukwengeza i-cellulose ether odakeni lukasimende.
Ngodaka oluxubekile, inqobo nje uma i-ether encane ye-cellulose ingathuthukisa kakhulu ukusebenza kodaka olumanzi, kungabonakala ukuthi i-cellulose ether iyisengezo esiyinhloko esithinta ukusebenza kokwakhiwa kodaka. “
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 uzokhiqiza 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.
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.
I-Cellulose ether - ukugcinwa kwamanzi
Ukugcinwa kwamanzi kuwumsebenzi obalulekile we-methyl cellulose ether, futhi kuwumsebenzi abakhiqizi abaningi basekhaya bengxube eyomile yodaka, ikakhulukazi labo abasezifundeni eziseningizimu enamazinga okushisa aphezulu, banake.
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, inani elincane le-cellulose ether lingathuthukisa kakhulu ukugcinwa kwamanzi kodaka. Uma umthamo ufinyelela okuthile Uma izinga lokugcinwa kwamanzi likhuphuka, inkambiso yezinga lokugcinwa kwamanzi iyancipha; lapho izinga lokushisa lendawo likhuphuka, ukugcinwa kwamanzi kwe-cellulose ether ngokuvamile kuyehla, kodwa amanye ama-cellulose ether ashintshiwe nawo anokugcinwa kwamanzi okungcono ngaphansi kwezimo zokushisa eziphezulu; amafayibha anamadigri aphansi okushintsha I-Vegan ether 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; i-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 ku-slurry kasimende; i-cellulose ether ithuthukisa udaka lukasimende olusha Izakhiwo ze-rheological, ukwakheka kwenethiwekhi enezimbotshana nokucindezela kwe-osmotic noma izakhiwo zefilimu ze-cellulose ether zivimbela ukusakazeka kwamanzi.
Ama-cellulose ethers - ukuqina kanye ne-thixotropy
I-Cellulose ether inika udaka olumanzi nge-viscosity enhle kakhulu, engakhuphula ngokuphawulekayo ikhono lokubopha phakathi kodaka olumanzi kanye nongqimba oluyisisekelo, futhi ithuthukise ukusebenza kokulwa nokucwila kodaka. Isetshenziswa kabanzi ekwenzeni udaka, udaka lokuhlanganisa izitini kanye nohlelo lokufakwa kwezindonga lwangaphandle. Umthelela wokujiya we-cellulose ether ungaphinda ukhulise ikhono lokulwa nokuhlakazeka kanye ne-homogeneity yezinto ezisanda kuxutshwa, uvimbele ukuhlukaniswa kwezinto, ukuhlukaniswa nokopha, futhi ungasetshenziswa kukhonkolo yefayibha, ukhonkolo ongaphansi kwamanzi kanye nokhonkolo ozihlanganisayo.
Umphumela 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. Ukwengeza, umphumela wokuqina we-cellulose ether uzokwandisa isidingo samanzi sezinto ezisekelwe kusimende futhi ukwandise isivuno sodaka.
Isixazululo se-aqueous cellulose cellulose ether esine-high-viscosity sine-thixotropy ephezulu, ephinde ibe yisici 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-MC, i-HPMC, i-HEMC, izohlale ibonisa 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.
Isikhathi sokuthumela: Dec-01-2022