Ukuphakama kwe-viscosity ye-hydroxypropyl methylcellulose, kuba ngcono ukusebenza kokugcinwa kwamanzi. I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-HPMC. Njengamanje, abakhiqizi abahlukene be-HPMC basebenzisa izindlela namathuluzi ahlukene ukukala i-viscosity ye-HPMC. Izindlela eziyinhloko yi-Haake Rotovisko, i-Hoppler, i-Ubbelohde ne-Brookfield.
Ngomkhiqizo ofanayo, imiphumela ye-viscosity elinganiswa ngezindlela ezahlukene ihluka kakhulu, futhi eminye ihluke ngokuphindwe kabili. Ngakho-ke, uma uqhathanisa ama-viscosities, qiniseka ukuthi uwenza phakathi kwezindlela ezifanayo zokuhlola, okuhlanganisa izinga lokushisa, i-spindle, njll.
Mayelana nosayizi wezinhlayiyana, ukucoleka kwezinhlayiya, kuba ngcono nokugcinwa kwamanzi. Lapho izinhlayiya ezinkulu ze-cellulose ether zihlangana namanzi, indawo engaphezulu iyancibilika yenze ijeli, egoqa izinto futhi ivimbele ukungena okuqhubekayo kwama-molecule amanzi. . Ithinta kakhulu umphumela wokugcina amanzi we-cellulose ether yayo, futhi ukuncibilika kungenye yezinto ekukhetheni i-cellulose ether. Ubuhle buphinde bube yinkomba yokusebenza ebalulekile ye-methylcellulose ether. I-MC esetshenziswa odakeni olomile idingeka ukuthi ibe yimpuphu, enomswakama ophansi, kanti ukucoleka kudinga u-20% kuya ku-60% wosayizi wezinhlayiyana ukuba ube ngaphansi kuka-63um. Ubuhle buthinta ukunyibilika kwe-hydroxypropyl methylcellulose ether. I-coarse MC ivamise ukuba yi-granular futhi incibilika kalula emanzini ngaphandle kwe-caking, kodwa izinga lokuncibilika lihamba kancane, ngakho-ke alifanele ukusetshenziswa odakeni olomile. Odakeni olomile, i-MC ihlakazeka ezintweni zikasimende njenge-aggregate, isigcwalisi esihle nosimende. Izimpushana kuphela ezikahle ngokwanele ezizovimbela i-methylcellulose ether ukuthi ingahlangani lapho ihlanganiswa namanzi. Uma i-MC ingeza amanzi ukuze incibilikise ama-aggregates, kuba nzima ukuhlakaza nokuhlakaza. I-MC ene-coarser fineness ayidali nje imfucuza, kodwa futhi inciphisa amandla endawo odaka. Lapho lolu hlobo lodaka olomile lwakhiwe endaweni enkulu, isivinini sokuphulukisa sodaka olomile lwendawo sincipha kakhulu, futhi ukuqhekeka kwenzeka ngenxa yezikhathi ezihlukene zokuphulukisa. Ukuze uthole udaka lwesifutho usebenzisa ukwakhiwa kwemishini, ukucoleka okuphezulu kuyadingeka ngenxa yesikhathi esifushane sokuxuba.
Ngokuvamile, ukuphakama kwe-viscosity, kuba ngcono umphumela wokugcina amanzi. Kodwa-ke, ukuphakama kwe-viscosity nesisindo samangqamuzana e-MC, ukwehla okuhambisanayo kokuncibilika, okunomthelela omubi emandleni nokusebenza kokwakhiwa kodaka. Ukuphakama kwe-viscosity, kusobala kakhulu umphumela wokuqina wodaka, kodwa awulingani. Lapho i-viscosity iphakama, udaka olumanzi luyanamathela. Izonamathela ku-scraper ngesikhathi sokwakhiwa futhi inokunamathela okuphezulu ku-substrate. Kodwa yenza okuncane ukukhulisa amandla esakhiwo sodaka olumanzi ngokwalo. Phakathi nenqubo yokwakha, ukusebenza kwe-anti-sag kwakungabonakali. Ngokuphambene, amanye ama-ethers e-methylcellulose aphansi kodwa ashintshiwe anezakhiwo ezinhle kakhulu ekuthuthukiseni amandla esakhiwo sezinsimbi ezimanzi.
Uma sikhulu inani le-cellulose ether engezwe odakeni, ngcono ukusebenza kokugcinwa kwamanzi, futhi lapho ukuphakama kwe-viscosity, kuba ngcono ukusebenza kokugcinwa kwamanzi.
Ukucoleka kwe-HPMC nakho kunomthelela othize ekugcineni amanzi. Ngokuvamile, kuma-methyl cellulose ether ane-viscosity efanayo kodwa ukucoleka okuhlukile, lapho inani lesengezo lilingana, ukucoleka kokuqina, kuba ngcono umphumela wokugcina amanzi.
Ukugcinwa kwamanzi kwe-HPMC nakho kuhlobene nezinga lokushisa lokusebenzisa. Ukugcinwa kwamanzi kwe-methylcellulose ether kuncipha njengoba izinga lokushisa likhuphuka. Kodwa-ke, ekusetshenzisweni kwezinto zangempela, udaka olomile luvame ukwakhiwa ezindaweni ezishisayo ezinamazinga okushisa aphezulu (ngaphezu kwama-degrees angu-40) ezindaweni eziningi, njengokufakwa kwe-putty ezindongeni zangaphandle ngaphansi kwelanga lasehlobo, okuvame ukusheshisa ukuqina kukasimende nokushintsha umbala. usimende. ukuqina. Udaka olomile. Ukuncipha kokugcinwa kwamanzi kwenza kucace ukuthi ukusebenza nokumelana nemifantu kuzothinteka, futhi kubaluleke kakhulu ukunciphisa umthelela wezici zokushisa ngaphansi kwezimo ezinjalo. Nakuba izithasiselo ze-methylhydroxyethylcellulose ether njengamanje zibhekwa njengezihamba phambili ekuthuthukisweni kobuchwepheshe, ukuncika kwazo kumazinga okushisa kusengaholela ekubeni buthakathaka kwezakhiwo zodaka olomile. Nakuba umthamo we-methylhydroxyethylcellulose (ifomula ye-Xia) unyusiwe, ukusetshenzwa nokumelana nokuqhekeka akukwazanga ukuhlangabezana nezidingo zokusetshenziswa. Ngokusebenzisa ezinye izindlela zokwelapha ezikhethekile, njengokwenyusa izinga le-etherification, njll., i-MC ingagcina ukugcinwa kwamanzi okungcono emazingeni okushisa aphakeme, ngaleyo ndlela inikeze ukusebenza okungcono ngaphansi kwezimo ezinzima.
Isikhathi sokuthumela: Feb-06-2024