Igama lesiShayina le-HPMC yi-hydroxypropyl methylcellulose. Ayiyona i-ionic futhi ivame ukusetshenziswa njenge-ejenti yokugcina amanzi ku-mortar exutshwe okomile. Yinto evame ukusetshenziswa kakhulu yokugcina amanzi ku-mortar. Umkhiqizo we-ether osuselwa ku-polysaccharide okhiqizwa yi-alkalization kanye ne-etherification. Ayinayo i-charge ngokwayo, ayisabelani nama-ion ashajiwe ku-gelling material, futhi isebenza kahle. Intengo nayo iphansi kunezinye izinhlobo zama-cellulose ethers, ngakho-ke isetshenziswa kabanzi ku-mortar exutshwe okomile.
Umsebenzi we-hydroxypropyl methylcellulose: Ingaqinisa udoti osanda kuhlanganiswa ukuze ube nomswakama othile futhi ivimbele ukuhlukaniswa. (Ukuqina) Ukugcinwa kwamanzi nakho kuyisici esibaluleke kakhulu, okusiza ukugcina inani lamanzi akhululekile kudoti, ukuze ngemva kokuba udoti sewakhiwe, izinto eziqinisa ugesi zibe nesikhathi esiningi sokumanzisa. (Ukugcinwa kwamanzi) Inezakhiwo zokungenisa umoya, ezingangenisa amabhamuza omoya afanayo nakancane ukuze kuthuthukiswe ukwakhiwa kodoti.
Uma i-viscosity ye-hydroxypropyl methylcellulose ether iphakeme, kulapho ukusebenza kokugcinwa kwamanzi kuba ngcono khona. Kumkhiqizo ofanayo, imiphumela ye-viscosity elinganiswa ngezindlela ezahlukene ihluke kakhulu, futhi eminye ize ibe nomehluko ophindwe kabili. Ngakho-ke, uma kuqhathaniswa i-viscosity, kumele kwenziwe phakathi kwezindlela zokuhlola ezifanayo, kufaka phakathi izinga lokushisa, i-rotor, njll.
Ngokuphathelene nosayizi wezinhlayiya, uma izinhlayiya zincane, kuba ngcono ukugcinwa kwamanzi. Ngemva kokuba izinhlayiya ezinkulu ze-cellulose ether zithintana namanzi, ubuso buncibilika ngokushesha bese benza ijeli yokusonga izinto ukuze kuvinjelwe ama-molecule amanzi ukuthi angaqhubeki nokungena. Ngezinye izikhathi ayikwazi ukuhlakazeka ngokulinganayo futhi ichitheke ngisho nangemva kokuxubha isikhathi eside, kwakha isixazululo esinamafu noma i-agglomeration. Kuthinta kakhulu ukugcinwa kwamanzi kwe-cellulose ether, futhi ukuncibilika kungenye yezinto ezibalulekile zokukhetha i-cellulose ether. Ukuncibilika nakho kuyinkomba yokusebenza ebalulekile ye-methyl cellulose ether. I-MC esetshenziselwa i-dry powder mortar iyadingeka ukuthi ibe yi-powder, enokuqukethwe kwamanzi okuphansi, kanti ukuncibilika kwayo kudinga ukuthi u-20%-60% wosayizi wezinhlayiya ube ngaphansi kuka-63um. Ukuncibilika kuthinta ukuncibilika kwe-hydroxypropyl methylcellulose ether. I-coarse MC ivame ukuba yi-granular, futhi kulula ukuyincibilika emanzini ngaphandle kokuhlanganiswa, kodwa izinga lokuncibilika lihamba kancane kakhulu, ngakho-ke ayifanele ukusetshenziswa ku-dry powder mortar. Ku-mortar yempuphu eyomile, i-MC ihlakazeka phakathi kwezinto zokufaka usimende njenge-aggregate, i-filler encane kanye ne-simende, futhi i-powder encane ngokwanele kuphela engagwema ukuhlangana kwe-methyl cellulose ether lapho ixutshwa namanzi.
Ngokuvamile, uma i-viscosity iphakeme, umphumela wokugcina amanzi uba ngcono. Kodwa-ke, uma i-viscosity iphakeme futhi isisindo sama-molecule se-MC 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. Okusho ukuthi, ngesikhathi sokwakhiwa, ukusebenza okulwa nokuwa akubonakali. Ngokuphambene nalokho, amanye ama-ether e-methyl cellulose ahlanganisiwe aphakathi nendawo naphansi asebenza kahle kakhulu ekuthuthukiseni amandla esakhiwo se-mortar emanzi.
Ukugcinwa kwamanzi kwe-HPMC kuhlobene nokushisa okusetshenzisiwe, kanti ukugcinwa kwamanzi kwe-methyl cellulose ether kwehla ngokwanda kwezinga lokushisa. Kodwa-ke, ekusetshenzisweni kwezinto zangempela, udoti owomile uvame ukufakwa ezindaweni ezishisayo emazingeni okushisa aphezulu (angaphezu kwama-degrees angu-40) ezindaweni eziningi, njengokuplasta i-wall putty yangaphandle ngaphansi kwelanga ehlobo, okuvame ukusheshisa ukuphotha usimende kanye nokuqina kodoti owomile. Ukwehla kwezinga lokugcina amanzi kuholela emzweni osobala wokuthi kokubili ukumelana nokusebenza kanye nokuqhekeka kuyathinteka, futhi kubaluleke kakhulu ukunciphisa ithonya lezici zokushisa ngaphansi kwalesi simo. Kulokhu, izithasiselo ze-methyl hydroxyethyl cellulose ether okwamanje zibhekwa njengezihamba phambili ekuthuthukisweni kobuchwepheshe. Nakuba inani le-methyl hydroxyethyl cellulose landa (ifomula yasehlobo), ukumelana nokusebenza kanye nokuqhekeka akukwazi ukuhlangabezana nezidingo zokusetshenziswa. Ngokwelashwa okukhethekile ku-MC, njengokwandisa izinga le-etherification, njll., umphumela wokugcina amanzi ungagcinwa ekushiseni okuphezulu, ukuze ukwazi ukunikeza ukusebenza okungcono ngaphansi kwezimo ezinzima.
Ngokuvamile, i-HPMC inokushisa kwejeli, okungahlukaniswa cishe kube izinhlobo ezingama-60, izinhlobo ezingama-65, kanye nezinhlobo ezingama-75. Kumabhizinisi asebenzisa isihlabathi somfula ku-mortar evamile exutshwe ngomuthi, kungcono ukusebenzisa i-HPMC yohlobo lwama-75 enokushisa okuphezulu kwejeli. Umthamo we-HPMC akufanele ube phezulu kakhulu, ngaphandle kwalokho uzokwandisa isidingo samanzi se-mortar, uzonamathela ku-trowel, futhi isikhathi sokusetha sizoba side kakhulu, okuzothinta ukwakheka. Imikhiqizo ehlukene ye-mortar isebenzisa i-HPMC enokuqina okuhlukile, futhi ayisebenzisi i-HPMC enokuqina okuphezulu ngokunganaki. Ngakho-ke, yize imikhiqizo ye-hydroxypropyl methylcellulose imihle, iyanconywa uma isetshenziswa kahle. Ukukhetha i-HPMC efanele kungumthwalo wemfanelo oyinhloko wabasebenzi belabhoratri bebhizinisi.
Isikhathi sokuthunyelwe: Ephreli-12-2023