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.
Inqubo yokukhiqiza ye-HPMC ngokuyinhloko iwumkhiqizo we-ether osuselwa ku-polysaccharide okhiqizwa yi-alkalization kanye ne-etherification ye-cotton fiber (yasekhaya). Ayinayo i-charge ngokwayo, ayisabelani nama-ion ashajiwe ezintweni ze-gelling, futhi isebenza kahle. Intengo nayo iphansi kunezinye izinhlobo zama-ether e-cellulose, 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. I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-HPMC. Njengamanje, abakhiqizi abahlukene be-HPMC basebenzisa izindlela namathuluzi ahlukene ukukala i-viscosity ye-HPMC. Izindlela eziyinhloko yiHaakeRotovisko, iHoppler, i-Ubbelohde kanye neBrookfield.
Kumkhiqizo ofanayo, imiphumela ye-viscosity elinganiswa ngezindlela ezahlukene ihluke kakhulu, futhi eminye ize ibe nomehluko ophindwe kabili. Ngakho-ke, uma kuqhathaniswa i-viscosity, kumele yenziwe phakathi kwezindlela zokuhlola ezifanayo, kufaka phakathi izinga lokushisa, i-rotor, njll. Ngokuphathelene nosayizi wezinhlayiya, lapho izinhlayiya zincane, kuba ngcono ukugcinwa kwamanzi. Ngemva kokuba izinhlayiya ezinkulu ze-cellulose ether zithintana namanzi, ubuso buncibilika ngokushesha bese benza ijeli yokugoqa izinto ukuze kuvinjelwe ama-molecule amanzi ukuthi angaqhubeki nokungena. Ngezinye izikhathi ayikwazi ukuhlakazeka ngokulinganayo futhi ichitheke ngisho nangemva kokuxutshwa isikhathi eside, kwakha isixazululo se-flocculent esinamafu noma i-agglomeration. Kuthinta kakhulu ukugcinwa kwamanzi kwe-cellulose ether, futhi ukuncibilika kungenye yezinto ezibangela ukukhetha i-cellulose ether.
Ubucwebe buyinkomba ebalulekile yokusebenza kwe-methyl cellulose ether. I-MC esetshenziselwa udoti wempuphu owomile iyadingeka ukuthi ibe yimpuphu, enokuqukethwe okuphansi kwamanzi, kanti ubucwebe budinga futhi u-20% ~ 60% wosayizi wezinhlayiya ukuthi ube ngaphansi kuka-63um. Ubucwebe buthinta ukuncibilika kwe-hydroxypropyl methylcellulose ether. I-MC ecolekile ivame ukuba yi-granular, futhi kulula ukuyincibilikisa emanzini ngaphandle kokuhlanganiswa, kodwa izinga lokuncibilika lihamba kancane kakhulu, ngakho-ke ayifanele ukusetshenziswa kudoti wempuphu owomile.
Ku-dry powder mortar, i-MC ihlakazeka phakathi kwezinto zokufaka usimende njenge-aggregate, i-filler encane kanye ne-cement, futhi i-powder encane kuphela engagwema i-methyl cellulose ether agglomeration uma ixutshwa namanzi. Uma i-MC ingezwa ngamanzi ukuze kuncibilikiswe ama-agglomerate, kunzima kakhulu ukuhlakaza nokuncibilikisa. Ukuqina kwe-MC akugcini nje ngokuchitha imali, kodwa futhi kunciphisa amandla endawo e-mortar. Uma i-dry powder mortar enjalo isetshenziswa endaweni enkulu, ijubane lokupholisa le-dry powder mortar yendawo lizoncishiswa kakhulu, futhi kuzovela imifantu ngenxa yezikhathi ezahlukene zokupholisa. Ku-mortar efuthwe ngokwakhiwa komshini, isidingo sokuqina siphezulu ngenxa yesikhathi esifushane sokuxuba. Ngokuvamile, lapho i-viscosity iphakeme, umphumela wokugcina amanzi uba ngcono. Kodwa-ke, lapho 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, kulapho umphumela wokujiya ubonakala khona ku-mortar, kodwa awulingani ngokuqondile. Uma i-viscosity iphakeme, kulapho i-mortar emanzi izoba yinkimbinkimbi khona, okungukuthi, ngesikhathi sokwakha, ibonakala njengokunamathela ku-scraper kanye nokunamathela okuphezulu ku-substrate. Kodwa akusizi ukwandisa amandla esakhiwo se-mortar emanzi uqobo. Okusho ukuthi, ngesikhathi sokwakha, ukusebenza okulwa nokuwa akubonakali. Ngokuphambene nalokho, amanye ama-viscosity aphakathi nendawo naphansi kodwa aguquliwe e-methyl cellulose ethers asebenza kahle kakhulu ekuthuthukiseni amandla esakhiwo se-mortar emanzi.
Ukugcinwa kwamanzi kwe-HPMC kuhlobene nokushisa okusetshenzisiwe, kanti ukugcinwa kwamanzi kwe-methyl cellulose ether kwehla ngokukhuphuka kwezinga lokushisa. Kodwa-ke, ekusetshenzisweni kwezinto zangempela, udoti owomile uvame ukufakwa ezindaweni ezishisayo emazingeni okushisa aphezulu (angaphezu kwama-degrees angu-40) ezindaweni eziningi, njengokuplasta kwangaphandle kodonga ngaphansi kwelanga ehlobo, okuvame ukusheshisa ukuqiniswa kwesimende kanye nokuqina kodoti owomile. Ukwehla kwezinga lokugcina amanzi kuholela emzwelweni osobala wokuthi kokubili ukusebenza kahle kanye nokumelana 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), ukusebenza kahle kanye nokumelana 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.
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 ene-viscosities ehlukene, futhi ayisebenzisi i-HPMC ene-viscosity ephezulu ngokunganaki. Ngakho-ke, yize imikhiqizo ye-hydroxypropyl methylcellulose imihle, iyanconywa uma isetshenziswa kahle. Ukukhetha i-HPMC efanele kungumthwalo wemfanelo oyinhloko wabasebenzi belabhoratri bebhizinisi. Njengamanje, abathengisi abaningi abangathembekile bahlanganisa i-HPMC, futhi ikhwalithi iphansi impela. Lapho bekhetha i-cellulose ethile, ilabhoratri kufanele yenze umsebenzi omuhle ekuhlolweni ukuqinisekisa ukuzinza komkhiqizo we-mortar, futhi bangabi nomdlandla wokuthola okushibhile futhi babangele ukulahlekelwa okungadingekile.
Isikhathi sokuthunyelwe: Meyi-04-2023