Focus on Cellulose ethers

Imikhiqizo ye-Cellulose Ether Yezinamathiselo Zethayela Ezisebenza Kakhulu

Isifinyezo:

Njengesengezo esibaluleke kakhulu kuma-adhesives we-tile, i-cellulose ether inethonya elinamandla emandleni okudweba kanye nesikhathi esivulekile sokunamathisela ama-tile, futhi lezi zinto ezimbili nazo ziyizinkomba ezibalulekile ze-adhesive tile esebenza kakhulu. Imiphumela yama-ethers ezimpahleni zokunamathisela amathayili ifingqiwe futhi ibuyekezwe.

 

I-cellulose ether; Amandla efindo elikhishwe; Isikhathi sokuvula

 

1 Isingeniso

I-adhesive-based tile adhesive okwamanje iwukusetshenziswa okukhulu kakhulu kodaka olukhethekile oluxutshwe okomile, olwakhiwe usimende njengento eyinhloko kasimende futhi yengezwe ngamaqoqo ahlanganisiwe, ama-agent okugcina amanzi, ama-ejenti wamandla okuqala, i-latex powder nezinye izithasiselo eziphilayo noma ezingaphili. ingxube. Ngokuvamile, idinga kuphela ukuxutshwa namanzi lapho isetshenziswa. Uma kuqhathaniswa nodaka olujwayelekile lukasimende, lungathuthukisa kakhulu amandla okubopha phakathi kwezinto ezibhekene ne-substrate, futhi linokumelana okuhle kokushelela kanye nokumelana okuhle kakhulu kwamanzi namanzi. Ngokuyinhloko isetshenziselwa ukunamathisela izinto zokuhlobisa ezifana nokwakha amathayela odonga lwangaphakathi nangaphandle, amathayili aphansi, njll. Isetshenziswa kakhulu ezindongeni zangaphakathi nangaphandle, phansi, izindlu zangasese, amakhishi nezinye izindawo zokuhlobisa izakhiwo. Njengamanje iyona nto esetshenziswa kakhulu i-Tile bonding material.

 

Ngokuvamile lapho sahlulela ukusebenza kwe-adhesive ye-tile, asigcini nje ukunaka ukusebenza kwayo nokusebenza nekhono lokulwa nokuslayida, kodwa futhi sinake amandla ayo emishini kanye nesikhathi sokuvula. I-cellulose ether ku-adhesive tile ayithinti kuphela izakhiwo ze-rheological ze-adhesive porcelain, njengokusebenza okubushelelezi, ummese wokunamathela, njll., kodwa futhi inethonya elinamandla ezintweni zemishini zokunamathisela i-tile.

 

2. Ithonya ngesikhathi esivulekile sokunamathela kwe-tile

Lapho impushana yenjoloba ne-cellulose ether kuhlangene odakeni olumanzi, amanye amamodeli edatha abonisa ukuthi impushana yenjoloba inamandla e-kinetic anamandla okunamathisela emikhiqizweni ye-cement hydration, futhi i-cellulose ether ikhona kakhulu ku-interstitial fluid, ethinta i-Mortar viscosity eyengeziwe nesikhathi sokumisa. Ukungezwani okungaphezulu kwe-cellulose ether kungaphezulu kwalokho kwempushana yerabha, futhi ukunothiswa kwe-cellulose ether okwengeziwe kusixhumi esibonakalayo sosimende kuzoba yinzuzo ekwakhekeni kwamabhondi e-hydrogen phakathi kwendawo eyisisekelo ne-cellulose ether.

 

Odakeni olumanzi, amanzi odaka ayahwamuka, futhi i-cellulose ether iyacetshiswa phezulu, futhi ifilimu izokwakhiwa ebusweni bodaka kungakapheli imizuzu emi-5, okuzonciphisa izinga lokuhwamuka okulandelayo, njengoba amanzi engeziwe ekhishwa. isuswe odakeni olujiyile Ingxenye yayo ithuthela ongqimbeni oluncane lodaka, futhi ifilimu eyakhiwe ekuqaleni iyancibilika kancane, futhi ukufuduka kwamanzi kuzoletha ukunothisa kwe-cellulose ether ngaphezulu kodaka. Njengoba kuboniswe kuMfanekiso 1

 

Ngakho-ke, ukwakheka kwefilimu ye-cellulose ether ebusweni bodaka kunethonya elikhulu ekusebenzeni kodaka. I-1) Ifilimu eyenziwe incane kakhulu futhi izohlakazwa kabili, engakwazi ukukhawulela ukuhwamuka kwamanzi nokunciphisa amandla. I-2) Ifilimu eyenziwe iminyene kakhulu, ukuhlushwa kwe-cellulose ether oketshezini lwe-mortar interstitial kuphezulu, i-viscosity iphezulu, futhi akulula ukuphula ifilimu engaphezulu lapho amathayili enamathiselwe. Kungabonakala ukuthi izakhiwo zefilimu ze-cellulose ether zinomthelela omkhulu ngesikhathi esivulekile.

 

Uhlobo lwe-cellulose ether (i-HPMC, i-HEMC, i-MC, njll.) kanye nezinga le-etherification (i-substitution degree) kuthinta ngokuqondile izakhiwo zefilimu ze-cellulose ether, kanye nobulukhuni nokuqina kwefilimu.

 

Isimo sokufuduka kwe-cellulose ether odakeni olumanzi (ingxenye engaphezulu ithayela le-ceramic elicinene, ingxenye engezansi isisekelo sikakhonkolo esinezimbobo)

 

3 Ithonya emandleni okukhipha

Ngaphezu kokudlulisela izici ezinenzuzo ezishiwo ngenhla odakeni, i-cellulose ether iphinde ibambezele i-hydration kinetics kasimende. Lo mphumela wokuvinjelwa ubangelwa ikakhulukazi ukukhangisa kwama-molecule e-cellulose ether ezigabeni ezihlukahlukene zamaminerali ohlelweni lukasimende olunikezwa amanzi, kodwa ngokuvamile, ukuvumelana ukuthi ama-molecule e-cellulose ether adsorbed kakhulu emanzini afana ne-CSH ne-calcium hydroxide. Emikhiqizweni yamakhemikhali, ayivamile ukukhangisa esigabeni sokuqala samaminerali se-clinker. Ngaphezu kwalokho, i-cellulose ether inciphisa ukuhamba kwama-ion (Ca2+, SO42-, ...) kusixazululo se-pore ngenxa yokwanda kwe-viscosity yesisombululo se-pore, ngaleyo ndlela kubambezeleka ngokwengeziwe inqubo yokukhipha amanzi.

 

I-Viscosity ingenye ipharamitha ebalulekile, emele izici zamakhemikhali ze-cellulose ether. Njengoba kushiwo ngenhla, i-viscosity ithinta kakhulu amandla okugcina amanzi futhi iphinde ibe nomthelela omkhulu ekusebenzeni kodaka olusha. Kodwa-ke, izifundo zokuhlola zithole ukuthi i-viscosity ye-cellulose ether cishe ayinawo umthelela kuma-kinetics we-cement hydration. Isisindo se-molecular sinomthelela omncane ku-hydration, futhi umehluko omkhulu phakathi kwezisindo zamangqamuzana ahlukene yi-10min kuphela. Ngakho-ke, isisindo samangqamuzana asiyona ipharamitha eyinhloko yokulawula ukugeleza kukasimende.

 

Ukuthambekela okuvamile ukuthi ku-MHEC, izinga eliphezulu le-methylation, umphumela obambezelekayo omncane we-cellulose ether. Ukwengeza, umphumela wokuhlehlisa we-hydrophilic substitution (njengokufaka esikhundleni se-HEC) unamandla kunalowo we-hydrophobic substitution (njengokufaka esikhundleni se-MH, MHEC, MHPC). Umthelela wokuhlehlisa we-cellulose ether uthintwa ikakhulukazi amapharamitha amabili, uhlobo nenani lamaqembu abambele.

 

Ukuhlola kwethu okuhlelekile kuphinde kwathola ukuthi okuqukethwe kwezinye izinto kudlala indima ebalulekile kumandla wokunamathisela amathayela. Sihlole ukusebenza kwe-HPMC ngamadigri ahlukene okufaka esikhundleni sokunamathela kuthayela, futhi sahlola umphumela wama-cellulose ethers aqukethe amaqembu ahlukene ngaphansi kwezimo ezihlukene zokuphulukisa ku-Ithonya lezakhiwo zemishini zokunamathisela amathayili, Umfanekiso 2 kanye noMfanekiso 3 imiphumela yezinguquko. kokuqukethwe kwe-methoxyl (DS) kanye nokuqukethwe kwe-hydroxypropoxyl (MS) ezimpahleni zokudonsa zokunamathelisa amathayili ekamelweni lokushisa.

 

Esivivinyweni, sibheka i-HPMC, okuyi-ether eyinhlanganisela, ngakho-ke kufanele sihlanganise lezi zithombe ezimbili. Ku-HPMC, idinga izinga elithile lokumuncwa ukuze iqinisekise ukunyibilika kwayo kwamanzi kanye nokudluliswa kokukhanya. Siyazi okuqukethwe izinto ezibambele Iphinde inqume izinga lokushisa lejeli le-HPMC, eliphinde linqume indawo yokusetshenziswa ye-HPMC. Ngale ndlela, okuqukethwe kweqembu kwe-HPMC okuvame ukusebenza nakho kufakwe kuhlaka ngaphakathi kwebanga. Kulolu hlu, indlela yokuhlanganisa i-methoxy ne-hydroxypropoxy Ukuze kuzuzwe umphumela omuhle kakhulu okuqukethwe kocwaningo lwethu. Ngaphakathi kwebanga elithile, ukwanda kokuqukethwe kwamaqembu e-methoxyl kuzoholela ekwehleni kwamandla okudonsa, kuyilapho ukwanda kokuqukethwe kwamaqembu e-hydroxypropoxyl kuzoholela ekwandeni kwamandla okudonsa. Kunomphumela ofanayo wamahora okuvula. Umthelela we-HPMC nokuqukethwe okuhlukile okuhlukile kuzakhiwo zikamshini ngaphansi kwesimo sesikhathi esivulekile semizuzu engama-20.

 

Ukushintsha kwesimo samandla emishini ngaphansi kwesimo sesikhathi esivulekile sihambisana nezinga lokushisa elijwayelekile, elihambisana nokuqina kwefilimu ye-cellulose ether esikhulume ngayo kuSigaba 2. Okuqukethwe kwe-methoxyl (DS) kuphezulu nokuqukethwe ye-hydroxypropoxyl HPMC enokuqukethwe okuphansi (MS) inokuqina okuhle kwefilimu, kodwa izophazamisa ukumanzisa kodaka olumanzi endaweni engaphezulu.

 

4 Isifinyezo

Ama-cellulose ethers, ikakhulukazi ama-methyl cellulose ether afana ne-HEMC ne-HPMC, ayizithasiselo ezibalulekile ezinhlelweni eziningi zodaka lwemiksi eyomile. Impahla ebaluleke kakhulu ye-cellulose ethers ukugcinwa kwabo kwamanzi ezintweni zokwakha amaminerali. Uma i-cellulose ether ingengeziwe, ungqimba oluncane lodaka olusha luzokoma ngokushesha, ukuze usimende ungabi namanzi ngendlela evamile, ukuze udaka lungakwazi ukuqina futhi lungakwazi ukuthola izakhiwo ezinhle zokubopha ungqimba lwesisekelo. Kunezici eziningi ezithinta ukugcinwa kwamanzi kwe-cellulose ether, njengemithamo kanye ne-viscosity, kanye nokwakheka kwayo kwangaphakathi: izinga lokushintsha linomthelela omkhulu ekusebenzeni kokugcina kodaka. Sekuyisikhathi eside sikholelwa ukuthi i-viscosity ye-cellulose ether ibalulekile ezintweni ezisekelwe kusimende. Isikhathi sokumisa usimende sinethonya elikhulu. Ucwaningo lwakamuva luye lwathola ukuthi ukuguqulwa kwe-viscosity kunomphumela omncane ngesikhathi sokumisa usimende. Ngokuphambene nalokho, uhlobo nenhlanganisela yamaqembu angena esikhundleni yizici ezibaluleke kakhulu ezithinta umsebenzi we-cellulose ether. Uma silindele umkhiqizo wokunamathisela we-tile osebenza kahle kakhulu, akufanele nje sicabangele izinguquko zempahla ye-rheological elethwa i-cellulose ether, okwenza udaka luphathe kalula, kodwa futhi sicabangele imiphumela yemishini yemikhiqizo ye-cellulose ether enezinga elifanele esikhundleni. nikela.


Isikhathi sokuthumela: Feb-09-2023
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