1 Isingeniso
Ukunamathela okususelwa ku-CEMMED kususwayo njengamanje uhlelo lokusebenza olukhulu kakhulu lodaka olukhethekile oluhlanganisiwe, oluhlanganiswe nosimende njengezinto eziphambili ze-cementled futhi ezingezwe ama-ejenti ama-green, ama-agents asebekhulile kanye nezinye izengezo ze-organic noma ezinye izithasiselo ingxube. Ngokuvamile, kudinga kuphela ukuhlanganiswa namanzi lapho kusetshenziswa. Uma kuqhathaniswa nodaka olujwayelekile lwamakhasi, kungathuthukisa kakhulu amandla abugqilayo phakathi kwezinto ezibhekene nempahla ebheke kanye ne-substrate, futhi inokuphikiswa okuhle kwamasheya namanzi amahle kakhulu nokuphikiswa kwamanzi. Isetshenziselwa ikakhulukazi ukunamathisela izinto zokuhlobisa ezinjengezakhiwo ezingaphakathi kanye namathayili odonga lwangaphandle, amathayili phansi, njll. Isetshenziswa kabanzi ezindongeni zangaphakathi nangaphandle, phansi, amakhishi, amakhishi kanye nezinye izindawo zokuhlobisa ezakhayo. Okwamanje kumanje kuyinto esetshenziswa kakhulu yokubopha izibopho ze-tile.
Imvamisa lapho sikwahlulela ukusebenza kwe-tile anamathela, asinakunaka kuphela ukusebenza kwaso okusebenzayo kanye nekhono lokulwa nokulwa, kepha nalondela amandla alo okuvulwa kanye nesikhathi sokuvula. I-Cellulose Ether in Tile Adhesive ayithintanga kuphela izakhiwo ze-Rheological of Porcelain Adhesive, njengokusebenza okubushelelezi, njll.
2. Umthelela ngesikhathi sokuvula se-tile anamathela
Lapho i-rubber powder kanye ne-cellulose ether co-ekhona ngodaka olumanzi, amanye amamodeli wedatha akhombisa ukuthi i-reabber powder inamandla okunamathisela imikhiqizo ye-celtetic hydration, futhi i-cellulose ether ikhona ngaphezulu ku-interstitial fluid, okuthinta ukubonakala kwesibhamu esithe xaxa nesikhathi sokusetha isikhathi. Ukungezwani komhlaba kwe-cellulose ether kuphakeme kunalokho kwe-awder yenjoloba, kanye nokucebisa okwengeziwe kwe-cellulose ether esibonakalayo somuntu ozosizakala ekwakhekeni kwama-hydrogen bond phakathi kwendawo eyisisekelo kanye ne-cellulose ether.
Ku-datar omanzi, amanzi asosimende evele ephuma enduneni, kanti i-cellulose ether iyacetshiswa phezu kobuso, futhi ifilimu izokwakhiwa ebusweni bodaka kungakapheli imizuzu emi-5, okuzonciphisa izinga elilandelayo Kususwe engxenyeni enkulu yodaka yayo ifudukela kungqimba olucwengekileyo, futhi ifilimu lakhiwa ekuqaleni lichithwa ngokwengxenye, futhi ukufuduka kwamanzi kuzoletha ukucebisa okwengeziwe kwe-ether ether.
Ngakho-ke, ukwakheka kwefilimu kwe-cellulose ether ngaphezulu kodaka kunethonya elikhulu ekusebenzeni kodaka. 1) Ifilimu elakhiwe lincane kakhulu futhi lizoncibilika kabili, elingakwazi ukunciphisa umkhawulo wamanzi futhi linciphise amandla. 2) Ifilimu elakhiwe likhulu kakhulu, ukugcwala kwe-cellulose ether ku-motarast arstitial ketshezi kuphezulu, futhi ukubukeka kuphakeme, ngakho-ke akulula ukwephula ifilimu engaphezulu lapho amathayili enamathiselwe. Kungabonakala ukuthi izakhiwo ezakha amafilimu ze-cellulose ether zinomthelela omkhulu esikhathini esivulekile. Uhlobo lwe-cellulose ether (HPMC, i-hemc, i-MC, njll.) Futhi izinga lokuthezeka (ukufakwa esikhundleni) lithinta ngqo izakhiwo ezenziwayo ze-cellulose ether, kanye nobulukhuni befilimu.
3. Ithonya emandleni okudweba
Ngaphezu kokudlulisela izakhiwo ezizuzisayo ezichazwe ngenhla ezizuzayo kudaka, i-cellulose ether ibuye ibambezelele ama-hydration kinetics kasimende. Lo mphumela wokubuyisa ubuchwepheshe ikakhulukazi ngenxa ye-adsorption yama-molecule e-cellulose ether ngezigaba ezinamaminerali ohlelweni lwamakhonkolo egcwele ama-hydrate, kodwa ngokuvamile, ukuvumela ama-cellulose ether molecule ikakhulukazi kumanzi anjenge-CSH ne-calcium hydroxide. Emikhiqizweni yamakhemikhali, akuvamile ukuthi akhishwe esigabeni sokuqala samaminerali se-Clinker. Ngaphezu kwalokho, i-cellulose ether inciphisa ukuhamba kwama-ion (CA2 +, SE42-, ...) Esisombululo se-pore ngenxa yokuvuleka okuphezulu kwesisombululo se-pore, ngaleyo ndlela kubambezele inqubo yokuthola i-hydration.
I-Viscosity enye ipharamitha ebalulekile, emele izici zamakhemikhali ze-cellulose ether. Njengoba kushiwo ngenhla, i-viscosity ikakhulukazi ithinta kakhulu umthamo wokugcina amanzi futhi inomthelela omkhulu ekusebenzeni kodaka olusha. Kodwa-ke, izifundo zokuhlola zithole ukuthi i-viscosity ye-cellulose ether icishe ibe nomthelela kuma-kinetics we-cent hyddration. Isisindo se-molecular sinomthelela omncane ku-hydration, kanye nomehluko omkhulu phakathi kwezinsimbi ezihlukile zamangqamuzana angama-10min kuphela. Ngakho-ke, isisindo se-molecular akuyona ipharamitha esemqoka yokulawula i-cydration cent hydration.
Ukubuyiselwa emuva kwe-cellulose eTher kuya ngesakhiwo sayo samakhemikhali, futhi inkambiso ejwayelekile yaphetha ngokuthi, nge-MHEC, kukhuphuka izinga le-methylation, umphumela ongaphansi we-cellulose ether. Ngaphezu kwalokho, umphumela wokubuyisa kabusha we-hydrophilic (enjengokufaka esikhundleni se-HEC) unamandla kunaleso sokufakwa esikhundleni se-hydrophobic (njengokufaka esikhundleni se-MH, Mhec, MHPC). Umphumela wokubuyisa we-cellulose ether uthinteka ikakhulukazi ngamapharamitha amabili, uhlobo kanye nenani lamaqembu angenalutho.
Ukuhlolwa kwethu okuhlelekile kubuye kwathola ukuthi okuqukethwe okutholwe kufakazela kudlala indima ebalulekile emandleni okusebenza ama-tile anamathela. Sihlole ukusebenza kwe-HPMC ngamazinga ahlukene wokufaka esikhundleni se-tile anamathela, futhi wahlola umphumela we-cellulose kanye nezimo ezinamaqembu ahlukene ngemiphumela emiphumeleni ngezindawo ezinamakhambi.
Esivivinyweni, sibheka i-HPMC, okuyi-ether exakile, ngakho-ke kufanele sibeke izithombe ezimbili ndawonye. Ku-HPMC, idinga izinga elithile lokutholwa ukuze kuqinisekiswe ukuthi i-solubility yayo yokuzinikela nokukhanya okulula. Siyakwazi okuqukethwe okuqukethwe okufakiwe futhi kunquma izinga lokushisa le-gel le-HPMC, okubuye kunqume indawo yokusebenzisa i-HPMC. Ngale ndlela, okuqukethwe kweqembu nge-HPMC okuvame ukusebenza nakho kufakwa ngaphakathi ebangeni. Kuleli banga, ukuthi ungahlanganisa kanjani i-methoppy ne-hydroxypropoxy ukuze uzuze umphumela omuhle kakhulu okuqukethwe kocwaningo lwethu. Umdwebo 2 ukhombisa ukuthi ngaphakathi kwebanga elithile, ukwanda kokuqukethwe kwamaqembu we-methoxyl kuzoholela enkambisweni ephansi emandleni okukhipha, ngenkathi ukwanda kokuqukethwe kwamaqembu e-hydroxypropoxyls kuzoholela ekwandeni kwamandla okukhipha . Kunomphumela ofanayo wamahora wokuvula.
Umkhuba wokushintsha wamandla emishini ngaphansi kwesimo sesikhathi esivulekile uyahambisana nalokho ngaphansi kwezimo zokushisa ezijwayelekile. I-HPMC enokuqukethwe okuphezulu kwe-methoxyl (DS) kanye nokuqukethwe okuphansi kwe-hydroxypropoxyl (MS) kunokubumba okuhle kwefilimu, kepha kuzothinta udaka olumanzi kunalokho. Izakhiwo ezimanzi ezibonakalayo.
Isikhathi sePosi: Jan-09-2023