I-viscosity enkulu yeI-HPMCi-hydroxypropyl methyl cellulose, ngcono ukusebenza kokugcinwa kwamanzi. I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-HPMC. Njengamanje, abakhiqizi abahlukene be-HPMC basebenzisa izindlela namathuluzi ahlukene ukuze banqume i-viscosity ye-HPMC. Izindlela eziyinhloko yi-Haake I-Rotovisko, i-Hoppler, i-Ubbelohde ne-Brookfield, njll.
Ngomkhiqizo ofanayo, imiphumela ye-viscosity elinganiswa ngezindlela ezahlukene ihluke kakhulu, eminye ihluke kakhulu. Ngakho-ke, uma uqhathanisa i-viscosity, kufanele yenziwe phakathi kwendlela yokuhlola efanayo, kufaka phakathi izinga lokushisa, i-rotor, njll.
Ngosayizi wezinhlayiyana, ukucoleka kwezinhlayiyana, kuba ngcono nokugcinwa kwamanzi. Izinhlayiya ezinkulu ze-cellulose ether ezithintana namanzi, indawo engaphezulu iyancibilika ngokushesha futhi yakhe ijeli ukugoqa izinto ukuvimbela ama-molecule amanzi ukuthi aqhubeke nokungena, ngezinye izikhathi isikhathi eside esinyakazayo asikwazi ukuhlakazeka ngokulinganayo, ukwakheka kwesisombululo esinodaka noma i-flocculent solution. i-agglomerate. Ukunyibilika kwe-cellulose ether kungenye yezinto zokukhetha i-cellulose ether. I-Fineness futhi iyinkomba yokusebenza ebalulekile ye-methyl cellulose ether. I-MC yodaka olomile idinga impushana, okuqukethwe kwamanzi aphansi, nokucoleka kuka-20% ~ 60% usayizi wezinhlayiyana ngaphansi kuka-63um. Ubuhle buthinta ukuncibilika kweI-HPMCi-hydroxypropyl methyl cellulose ether. I-coarse MC ivamise ukuba yi-granular futhi ingancibilika kalula emanzini ngaphandle kwe-agglomerating, kodwa isivinini sokuhlakazeka sihamba kancane, ngakho-ke ayifanele ukusetshenziswa odakeni olomile. Odakeni olomile, i-MC ihlakazwa phakathi kwe-aggregate, izigcwalisi ezinhle nezinto zikasimende ezifana nosimende, futhi impushana kuphela ekahle ngokwanele engagwema ukunqwabelana kwe-methyl cellulose ether lapho ixutshwa namanzi. Lapho i-MC ingeza amanzi ukuncibilikisa i-agglomerate, kunzima kakhulu ukuyihlakaza nokuyincibilikisa. I-MC ene-coarse fineness ayigcini nje ngokumosha, kodwa futhi inciphisa amandla wendawo wodaka. Uma udaka olomile olunjalo lwakhiwe endaweni enkulu, isivinini sokuphulukisa sodaka olomile lwasendaweni sincipha kakhulu, okuholela ekuqhekekeni okubangelwa isikhathi sokuphulukisa esihlukile. Ngodaka lokufafaza ngomshini, ngenxa yesikhathi esifushane sokuxuba, ubuhle buphakeme.
Ngokuvamile, ukuphakama kwe-viscosity, kuba ngcono umphumela wokugcina amanzi. Kodwa-ke, lapho i-viscosity iphezulu, isisindo se-molecule ye-MC siphezulu, futhi ukusebenza kokuhlakazeka kuzokwehla ngokuhambisanayo, okunomthelela omubi emandleni nasekusebenzeni kokwakhiwa kodaka. Ukuphakama kwe-viscosity, umphumela wokujiya we-mortar ubonakala, kodwa awulingani nobuhlobo. Ukuphakama kwe-viscosity, udaka olumanzi luyoba lunamathele kakhulu, kokubili ukwakhiwa, ukusebenza kwe-scraper enamathelayo kanye nokunamathela okuphezulu kwesisekelo. Kodwa akusizi ukwandisa amandla esakhiwo sodaka olumanzi. Ngesikhathi sokwakhiwa, ukusebenza kwe-anti-sag akubonakali. Ngokuphambene, i-viscosity ethile ephansi kodwa i-methyl cellulose ether eshintshiwe inokusebenza okuhle kakhulu ekuthuthukiseni amandla esakhiwo sodaka olumanzi.
Uma i-cellulose ether ingeziwe odakeni, ukusebenza okungcono kokugcinwa kwamanzi, ukuphakama kwe-viscosity, ukusebenza okungcono kokugcinwa kwamanzi.
Ubucwebe be-HPMC buphinde bube nomthelela othile ekugcineni amanzi, uma sikhuluma ngokujwayelekile, i-viscosity efanayo kanye nokucoleka okuhlukile kwe-methyl cellulose ether, esimweni senani elifanayo lokwengezwa, umphumela wokugcina amanzi uba ngcono.
Ukugcinwa kwamanzi kwe-HPMC nakho kuhlobene nezinga lokushisa lokusetshenziswa, futhi ukugcinwa kwamanzi kwe-methyl cellulose ether kuncipha ngokunyuka kwezinga lokushisa. Kodwa ekusetshenzisweni kwezinto ezibonakalayo, izindawo eziningi zodaka olomile ngokuvamile zizoba sezingeni lokushisa eliphezulu (ngaphezulu kwama-degrees angu-40) ngaphansi kwesimo sokwakhiwa endaweni eshisayo, njengokufakwa ehlobo kwe-putty plastering yangaphandle, evame ukusheshisa ukuqina kwe-substrate. usimende nodaka olomile ukuqina. Ukwehla kwezinga lokugcinwa kwamanzi kuholela emuzweni osobala wokuthi kokubili ukwakheka nokumelana nokuqhekeka kuyathinteka. Kulesi simo, ukunciphisa ithonya lezici lokushisa kuba okubaluleke kakhulu. Nakuba isithasiselo se-methyl hydroxyethyl cellulose ether sithathwa njengesihamba phambili ekuthuthukisweni kobuchwepheshe, ukuncika kwayo kumazinga okushisa kusazoholela ekwenziweni buthaka kwezakhiwo zodaka olomile. Ngisho nokwenyuka komthamo we-methyl hydroxyethyl cellulose (ifomula yasehlobo), ukumelana nokwakhiwa nokuqhekeka akukakwazi ukuhlangabezana nezidingo zokusetshenziswa. Ngokwelashwa okuthile okukhethekile kwe-MC, njengokwandisa izinga lokufakwa kwe-etherification, umphumela wokugcina amanzi we-MC ungagcina umphumela ongcono ngaphansi kwezinga lokushisa eliphezulu, ukuze ukwazi ukunikeza ukusebenza okungcono ngaphansi kwezimo ezinzima.
Isikhathi sokuthumela: May-18-2022