eyodwa. Umehluko phakathi kokungcoliswai-hydroxypropyl methylcellulose (HPMC)kanye ne-hydroxypropyl methylcellulose emsulwa (HPMC)
1. Ukubukeka: I-HPMC emsulwa ye-hydroxypropyl methylcellulose ibukeka ithambile futhi inobuningi obuphansi, kusukela ku-0.3-0.4g/ml; i-hydroxypropyl methylcellulose exubile i-HPMC inoketshezi olungcono futhi izwakala inzima, futhi kunomehluko omkhulu ekubukekeni kwayo kumkhiqizo wangempela.
2. Isimo: Impuphu ye-hydroxypropyl methylcellulose ye-HPMC emsulwa ine-fibrous ngaphansi kwe-microscope noma ingilazi yokukhulisa; kuyilapho i-hydroxypropyl methylcellulose exutshwe ne-HPMC ingabonakala njengezinto eziqinile noma amakristalu ngaphansi kwe-microscope noma ingilazi yokukhulisa.
3. Iphunga: I-hydroxypropyl methylcellulose emsulwa i-HPMC ayikwazi ukuhogela iphunga le-ammonia, isitashi kanye notshwala; i-hydroxypropyl methylcellulose exutshwe ne-HPMC ingahogela zonke izinhlobo zamaphunga, noma ngabe ayinambitheki, izozwakala inzima.
4. Isixazululo samanzi: isixazululo samanzi se-hydroxypropyl methylcellulose se-HPMC esimsulwa sicacile, sidlulisa ukukhanya okuphezulu, izinga lokugcina amanzi ≥ 97%; isixazululo samanzi se-hydroxypropyl methylcellulose se-HPMC esixubile sinodaka, futhi izinga lokugcina amanzi kunzima ukulifinyelela ku-80%.
Okwesibili, ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose HPMC, kuhlukanisa izinzuzo kanye nokungalungi:
Ukugcinwa kwamanzi kwe-methyl cellulose ether ngaphansi kwezimo zokushisa okuphezulu kuyinkomba ebalulekile yokuhlukanisa ikhwalithi ye-methyl cellulose ether. Izici ezifana nokushisa komoya, izinga lokushisa kanye nesivinini sokucindezela komoya kuzothinta izinga lokuguquguquka kwamanzi ku-samente mortar kanye nemikhiqizo esekelwe ku-gypsum. Ngakho-ke, ezinkathini ezahlukene, kunomehluko othile emphumeleni wokugcina amanzi wemikhiqizo enenani elifanayo le-HPMC elingeziwe. Ekwakhiweni okuthile, umphumela wokugcina amanzi we-slurry ungalungiswa ngokwandisa noma ukunciphisa inani le-HPMC elingeziwe. Imikhiqizo emihle kakhulu ye-hydroxypropyl methylcellulose HPMC ingaxazulula ngempumelelo inkinga yokugcina amanzi ngaphansi kokushisa okuphezulu.
I-methylcellulose esezingeni eliphezulu ingasakazwa ngokulinganayo nangokuphumelelayo ku-cement mortar kanye nemikhiqizo esekelwe ku-gypsum, futhi igoqe zonke izinhlayiya eziqinile, bese yakha ifilimu yokumanzisa, umswakama osesisekelweni ukhishwa kancane kancane isikhathi eside, kanye ne-inorganic. Ukusabela kokumanzisa kwezinto ezifakwe ku-gel kuqinisekisa amandla okubopha kanye namandla okucindezela kwezinto. I-hydroxypropyl methylcellulose HPMC esezingeni eliphezulu, ukufana kwayo kuhle kakhulu, amaqembu ayo e-methoxy kanye ne-hydroxypropoxy asatshalaliswa ngokulinganayo ku-cellulose molecular chain, ingandisa umoya-mpilo kuma-hydroxyl kanye ne-ether bonds. Amandla ama-athomu okuhlangana namanzi ukwakha ama-hydrogen bonds aguqula amanzi akhululekile abe ngamanzi aboshwe, ngaleyo ndlela alawule ngempumelelo ukuhwamuka kwamanzi okubangelwa yisimo sezulu esishisa kakhulu futhi afinyelele ukugcinwa kwamanzi okuphezulu.
Ngakho-ke, ekwakheni ehlobo okushisa okuphezulu, ukuze kufezwe umphumela wokugcina amanzi, kuyadingeka ukwengeza imikhiqizo ye-HPMC esezingeni eliphezulu ngobuningi obanele ngokwefomula, ngaphandle kwalokho, kuzoba nokumanzi okwanele, amandla anciphile, ukuqhekeka, ukugoba kanye nokuchitheka okubangelwa ukoma ngokweqile. Kodwa futhi kwandisa ubunzima bokwakha bezisebenzi. Njengoba izinga lokushisa lehla, inani lamanzi engeziwe i-HPMC lingancishiswa kancane kancane, futhi umphumela ofanayo wokugcina amanzi ungafinyelelwa.
3. Ukuncibilika kwe-hydroxypropyl methylcellulose HPMC
Embonini yokwakha, i-hydroxypropyl methylcellulose HPMC ivame ukufakwa emanzini angathathi hlangothi, kanti umkhiqizo we-HPMC uncibilika wodwa ukuze kuhlulelwe izinga lokuncibilika. Ngemva kokufakwa emanzini angathathi hlangothi wodwa, umkhiqizo oncibilika ngokushesha ngaphandle kokuhlakazeka ungumkhiqizo ongenakho ukwelashwa komhlaba; ngemva kokufakwa emanzini angathathi hlangothi wodwa, umkhiqizo ongahlakazeka futhi ungancibiliki ungumkhiqizo onokwelashwa komhlaba. Lapho i-hydroxypropyl methylcellulose HPMC engakaphathwa incibilika yodwa, inhlayiya yayo eyodwa iyancibilika ngokushesha futhi yakhe ifilimu ngokushesha, okwenza amanzi angabe esangena kwezinye izinhlayiya, okuholela ekuhlanganisweni nasekuhlanganisweni, okwamanje okubizwa ngokuthi ukuncibilika okuhamba kancane emkhiqizweni wemakethe.
Izinhlayiya zomkhiqizo we-HPMC eziphathwe nge-surface-treated hydroxypropyl methylcellulose, emanzini angathathi hlangothi, izinhlayiya ngazinye zingahlakazeka ngaphandle kokuhlangana, kodwa i-viscosity yomkhiqizo ngeke isheshe. Ngemva kokucwiliswa isikhathi esithile, isakhiwo samakhemikhali sokuphathwa kobuso siyabhujiswa, futhi amanzi angancibilikisa izinhlayiya ze-HPMC. Ngalesi sikhathi, izinhlayiya zomkhiqizo sezihlakazeke ngokuphelele futhi zamuncwa amanzi anele, ngakho umkhiqizo ngeke uhlangane noma uhlangane ngemva kokuncibilika. Ijubane lokuhlakazeka kanye nejubane lokuncibilika kuncike ezingeni lokuphathwa kobuso. Uma ukwelashwa kobuso kuncane, ijubane lokuhlakazeka lihamba kancane futhi ijubane lokunamathela liyashesha; kuyilapho umkhiqizo onokuphathwa kobuso okujulile unejubane lokuhlakazeka okusheshayo kanye nejubane lokunamathela kancane. Uma ufuna ukwenza lolu chungechunge lwemikhiqizo luncibilike ngokushesha kulesi simo, ungalahla inani elincane lezinto ze-alkaline uma zincibilika zodwa. Imakethe yamanje ivame ukubizwa ngokuthi imikhiqizo esheshayo. Izici zemikhiqizo ye-HPMC ephathwe nge-surface yilezi: kwisisombululo samanzi, izinhlayiya zingahlakazeka zodwa, zingancibilika ngokushesha esimweni se-alkaline, futhi zincibilike kancane esimweni se-neutral nesi-acidic.
Izici ze-hydroxypropyl methylcellulose HPMC engalashwa yilezi: inhlayiya eyodwa incibilika ngokushesha kakhulu ezimweni ze-acidic, alkaline, kanye ne-neutral, kodwa ayikwazi ukuhlakazeka phakathi kwezinhlayiya oketshezini, okuholela ekuhlanganisweni nasekuhlanganisweni. Ekusebenzeni kwangempela, ngemva kokuhlakazeka ngokomzimba kwalolu chungechunge lwemikhiqizo nezinhlayiya eziqinile njengempuphu yerabha, usimende, isihlabathi, njll., izinga lokuncibilika lishesha kakhulu, futhi akukho ukuhlanganiswa noma ukuhlanganiswa. Uma kudingeka ukuncibilikisa imikhiqizo ye-HPMC ngokwehlukana, lolu chungechunge lwemikhiqizo kufanele lusetshenziswe ngokuqapha, njengoba luzohlangana futhi lubambe ndawonye. Uma kudingeka ukuncibilikisa umkhiqizo we-hydroxypropyl methylcellulose HPMC ongaphathwanga phezulu ngokwehlukana, udinga ukuhlakazwa ngokulinganayo ngamanzi ashisayo angu-95°C, bese upholiswa ukuze uncibilike.
Ekusebenzeni kwangempela kokukhiqiza, lolu chungechunge lwemikhiqizo luvame ukuncibilika ngemva kokuhlakazwa nezinye izinto eziqinile ngaphansi kwezimo ze-alkaline, futhi izinga lokuncibilika kwalo alihlukile kwelemikhiqizo engaphathwanga. Lifanele futhi ukusetshenziswa emikhiqizweni encibilika yodwa, ngaphandle kokugaywa noma izigaxa. Imodeli ethile yomkhiqizo ingakhethwa ngokuya ngesilinganiso sokuncibilika esidingwa ukwakhiwa.
Ngesikhathi senqubo yokwakha, kungakhathaliseki ukuthi kuyi-samente mortar noma i-gypsum-based slurry, iningi lazo ziyizinhlelo ze-alkaline, futhi inani le-HPMC elingeziwe lincane kakhulu, elingasakazwa ngokulinganayo phakathi kwalezi zinhlayiya. Uma kufakwa amanzi,I-HPMCizoncibilika ngokushesha.
Isikhathi sokuthunyelwe: Ephreli-26-2024