Ekukhiqizweni kwezinto zokwakha, ikakhulukazi udaka oluyimpuphu eyomile,i-cellulose etheridlala indima ebalulekile, ikakhulukazi ekukhiqizweni kodaka olukhethekile (udaka oluguquliwe), luyingxenye ebalulekile. Indima ebalulekile ye-ether ye-cellulose encibilikayo emanzini kudaka ngokuyinhloko amandla ayo amahle okugcina amanzi. Umphumela wokugcina amanzi we-ether ye-cellulose uncike ekumuncweni kwamanzi kwesendlalelo esiyisisekelo, ukwakheka kodaka, ukujiya kwesendlalelo sodaka, isidingo samanzi sedaka, kanye nesikhathi sokusetha kwezinto zokusetha.
Izitsha eziningi zobumba kanye nezokuplasta azibambi amanzi kahle, futhi amanzi kanye ne-slurry kuzohlukana ngemva kwemizuzu embalwa yokuma. Ukugcinwa kwamanzi kuyindlela ebalulekile yokusebenza kwe-methyl cellulose ether, futhi futhi kuyindlela abakhiqizi abaningi be-dry-mix mortar basekhaya, ikakhulukazi labo abasezindaweni eziseningizimu ezinamazinga okushisa aphezulu, abayinaka. Izici ezithinta umphumela wokugcina amanzi we-dry powder mortar zifaka phakathi inani lokwengeza, i-viscosity, ubuncane bezinhlayiya, kanye nokushisa kwendawo yokusetshenziswa.
Ukugcinwa kwamanzii-cellulose etherngokwalo kuvela ekuncibilikeni nasekuphelelweni kwamanzi kwe-cellulose ether uqobo. Njengoba sonke sazi, yize uchungechunge lwama-molecule e-cellulose luqukethe inani elikhulu lamaqembu e-OH anomswakama kakhulu, aluncibiliki emanzini, ngoba isakhiwo se-cellulose sinezinga eliphezulu le-crystallinity. Amandla okumanzisa amaqembu e-hydroxyl kuphela awanele ukumboza izibopho ze-hydrogen ezinamandla kanye namandla e-van der Waals phakathi kwama-molecule. Ngakho-ke, luyakhukhumala kuphela kodwa aluncibiliki emanzini. Lapho i-substituent ingeniswa kuchungechunge lwama-molecule, akuyona nje i-substituent ebhubhisa uchungechunge lwe-hydrogen, kodwa futhi nesibopho se-hydrogen esihlanganayo siyabhujiswa ngenxa yokuhlangana kwe-substituent phakathi kwamaketanga aseduze. Lapho i-substituent inkulu, ibanga eliphakathi kwama-molecule likhulu. Lapho ibanga likhulu. Lapho umphumela wokubhubhisa izibopho ze-hydrogen ukhula, i-cellulose ether iba yincibiliki emanzini ngemva kokuba i-cellulose lattice ikhula futhi isixazululo singena, sakhe isixazululo esinomfutho ophezulu. Lapho izinga lokushisa likhuphuka, ukumanzisa kwe-polymer kuba buthaka, futhi amanzi phakathi kwamaketanga ayaxoshwa. Uma umphumela wokuphelelwa amanzi emzimbeni wanele, ama-molecule aqala ukuhlangana, akha ijeli yesakhiwo senethiwekhi enezinhlangothi ezintathu bese egoqeka.
Ngokuvamile, uma i-viscosity iphakeme, umphumela wokugcina amanzi uba ngcono. Kodwa-ke, uma i-viscosity iphakeme futhi isisindo sama-molecule siphakeme, ukwehla okuhambisanayo kokuncibilika kwayo kuzoba nomthelela omubi emandleni nasekusebenzeni kokwakhiwa kwe-mortar. Uma i-viscosity iphakeme, umphumela wokujiya ubonakala kakhulu ku-mortar, kodwa awulingani ngokuqondile. Uma i-viscosity iphakeme, kulapho i-mortar emanzi izoba yinkimbinkimbi khona, okungukuthi, ngesikhathi sokwakhiwa, ibonakala njengokunamathela ku-scraper kanye nokunamathela okuphezulu ku-substrate. Kodwa akusizi ukwandisa amandla esakhiwo se-mortar emanzi uqobo. Ngesikhathi sokwakhiwa, ukusebenza okulwa nokuwa akubonakali. Ngokuphambene nalokho, i-viscosity ethile ephakathi nephansi kodwa i-methyl eguquliweama-ether e-cellulosezisebenza kahle kakhulu ekuthuthukiseni amandla esakhiwo se-wet mortar.
Isikhathi sokuthunyelwe: Ephreli-25-2024