Ungahlulela kanjani ikhwalithi yeHydroxypropyl Methyl Cellulose HPMC?

(1). Umehluko phakathi kwe-hydroxypropyl methylcellulose (HPMC) ehlanganisiwe ne-pure hydroxypropyl methylcellulose (HPMC)
1. Ukubukeka: I-HPMC ehlanzekile ye-hydroxypropyl methylcellulose ibukeka ithambile futhi inokuminyana kwenqwaba ephansi, esukela ku-0.3-0.4g/ml; I-hydroxypropyl methylcellulose ehlanganisiwe i-HPMC inoketshezi olungcono futhi izwakala isinda kakhulu , futhi kunomehluko omkhulu ekubukekeni komkhiqizo wangempela.
2. Isimo: I-hydroxypropyl methylcellulose ehlanzekile ye-HPMC powder ine-fibrous ngaphansi kwe-microscope noma ingilazi yokukhulisa; kuyilapho i-hydroxypropyl methylcellulose HPMC ehlanganisiwe ingabonwa njengamatshe aqinile ayimbudumbudu noma amakristalu ngaphansi kwesibonakhulu noma ingilazi ekhulisayo.

3. Iphunga: I-hydroxypropyl methylcellulose ehlanzekile HPMC ayikwazi ukuhogela iphunga le-ammonia, isitashi notshwala; I-HCMC ingakwazi ukuhogela zonke izinhlobo zephunga, noma ingenambitheki, Izozizwa isindayo.
4. Isixazululo esinamanzi: i-hydroxypropyl methylcellulose ehlanzekile ye-HPMC i-aqueous solution icacile, ukudlulisa ukukhanya okuphezulu, izinga lokugcinwa kwamanzi ≥ 97%; Isixazululo se-aqueous se-HPMC esihlanganisiwe se-hydroxypropyl methylcellulose sine-turbid, futhi izinga lokugcinwa kwamanzi kunzima ukufinyelela ku-80%.

(2), ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose HPMC, hlukanisa okuhle nokubi:

Ukugcinwa kwamanzi kwe-methyl cellulose ether ngaphansi kwezimo zokushisa okuphezulu kuyinkomba ebalulekile yokuhlukanisa ikhwalithi ye-methyl cellulose ether. Izinto ezifana nezinga lokushisa lomoya, izinga lokushisa kanye nesivinini somfutho womoya zizothinta izinga lokuguquguquka kwamanzi odaka lukasimende kanye nemikhiqizo esekelwe ku-gypsum. Ngakho-ke, ezinkathini ezihlukene zonyaka, kunomehluko othile kumphumela wokugcina amanzi wemikhiqizo enenani elifanayo le-HPMC elingeziwe. Ekwakhiweni okuthile, umphumela wokugcina amanzi we-slurry ungalungiswa ngokwandisa noma ukwehlisa inani le-HPMC elingeziwe. Imikhiqizo emihle kakhulu ye-hydroxypropyl methylcellulose HPMC ingaxazulula ngokuphumelelayo inkinga yokugcinwa kwamanzi ngaphansi kwezinga lokushisa eliphezulu.

I-methylcellulose yekhwalithi ephezulu ingahlakazwa ngokulinganayo nangempumelelo ku-simende nosimende kanye nemikhiqizo esekelwe ku-gypsum, futhi isonge zonke izinhlayiya eziqinile, futhi yakha ifilimu yokumanzisa, umswakama oyisisekelo ukhishwa kancane kancane isikhathi eside, kanye ne-inorganic The hydration reaction. we-gelled material iqinisekisa amandla esibopho namandla okucindezela kwezinto. Ikhwalithi ephezulu ye-hydroxypropyl methylcellulose HPMC, ukufana kwayo kuhle kakhulu, amaqembu ayo e-methoxy kanye ne-hydroxypropoxy asatshalaliswa ngokulinganayo eduze kweketango lamangqamuzana e-cellulose, ingakhuphula umoya-mpilo ku-hydroxyl ne-ether bond Ikhono lama-athomu lokuzihlanganisa namanzi ukuze akhe izibopho ze-hydrogen. iguqula amanzi amahhala abe amanzi abophekile, ngaleyo ndlela alawule ngempumelelo ukuhwamuka kwamanzi okubangelwa izinga lokushisa eliphezulu kanye nokuzuza ukugcinwa kwamanzi okuphezulu.
Ngakho-ke, ekwakhiweni kwehlobo lokushisa eliphezulu, ukuze kuzuzwe umphumela wokugcina amanzi, kuyadingeka ukwengeza imikhiqizo ye-HPMC yekhwalithi ephezulu ngobuningi obanele ngokusho kwefomula, ngaphandle kwalokho, kuyoba khona ukugeleza okwanele, amandla ancishisiwe, ukuqhekeka, ukugoba. kanye nokuchitheka okubangelwa ukomiswa ngokweqile. izinkinga, kodwa futhi ukwandisa nobunzima ukwakhiwa kwabasebenzi. Njengoba izinga lokushisa lehla, inani lamanzi i-HPMC engeziwe lingancishiswa kancane kancane, futhi umphumela ofanayo wokugcina amanzi ungafinyelelwa.

(3) Ukuqedwa kwe-hydroxypropyl methylcellulose HPMC

Embonini yezokwakha,i-hydroxypropyl methylcellulose HPMCkuvame ukufakwa emanzini angathathi hlangothi, futhi umkhiqizo we-HPMC uhlakazwa wodwa ukuze wahlulele izinga lokuchithwa. Ngemva kokufakwa emanzini angathathi hlangothi wodwa, umkhiqizo ogoqa ngokushesha ngaphandle kokuhlakazeka uwumkhiqizo ngaphandle kokuphathwa kwendawo; ngemva kokufakwa emanzini angathathi hlangothi wodwa, umkhiqizo ongahlakazeka futhi ungahlangani uwumkhiqizo onokwelashwa okungaphezulu. Lapho indawo engaphezulu enganakiwe ye-hydroxypropyl methylcellulose HPMC incibilika yodwa, inhlayiya yayo eyodwa incibilika ngokushesha futhi yakhe ifilimu ngokushesha, okubangela ukuthi amanzi angabe esangena kwezinye izinhlayiya, okuholela ekuhlanganiseni nasekuhlanganiseni, okwamanje okubizwa ngokuthi ukuncibilika kancane emkhiqizweni wemakethe.

Izinhlayiya zomkhiqizo we-Hydroxypropyl methylcellulose we-HPMC ophethwe phezulu, emanzini angathathi hlangothi, izinhlayiya ngazinye zingahlakazwa ngaphandle kokuhlanganiswa, kodwa i-viscosity yomkhiqizo ngeke ngokushesha. Ngemuva kokucwiliswa isikhathi esithile, ukwakheka kwamakhemikhali okwelashwa okungaphezulu kuyabhujiswa, futhi amanzi angancibilikisa izinhlayiya ze-HPMC. Ngalesi sikhathi, izinhlayiya zomkhiqizo ziye zahlakazeka ngokugcwele futhi amuncwa amanzi anele, ngakho umkhiqizo ngeke agglomerate noma agglomerate ngemva kokuhlakazeka. Isivinini sokuhlakazeka nesivinini sokuhlakazeka sincike ezingeni lokwelashwa kwendawo. Uma ukwelashwa kwendawo kukuncane, isivinini sokuhlakazeka sihamba kancane futhi isivinini sokunamathela siyashesha; kuyilapho umkhiqizo onokwelashwa kwendawo ejulile unesivinini sokuhlakazeka okusheshayo kanye nesivinini sokunamathela esinensayo. Uma ufuna ukwenza lolu chungechunge lwemikhiqizo luhlakazeke ngokushesha kulesi simo, ungakwazi ukulahla inani elincane lezinto ezine-alkali uma zihlakazeka zodwa. Imakethe yamanje ngokuvamile ibizwa ngokuthi imikhiqizo esheshayo. Izici zemikhiqizo ye-HPMC ephathwe phezulu yilezi: kusisombululo esinamanzi, izinhlayiya zingahlakazeka zodwa, zingancibilika ngokushesha kusimo se-alkaline, futhi zincibilike kancane esimweni sokungathathi hlangothi nesimuncu.

Izici ze-Hydroxypropyl methylcellulose HPMC engaphathwanga yilezi: izinhlayiyana eyodwa incibilika ngokushesha kakhulu ku-acidic, alkaline, nezimo ezingathathi hlangothi, kodwa ayikwazi ukuhlakaza phakathi kwezinhlayiya oketshezini, okuholela ekuhlanganiseni nasekuhlanganiseni. Ekusebenzeni kwangempela, ngemva kokuhlakazeka ngokomzimba kwalolu chungechunge lwemikhiqizo kanye nezinhlayiya eziqinile ezifana nempuphu yerabha, usimende, isihlabathi, njll., izinga lokuhlakazeka liyashesha kakhulu, futhi akukho ukuhlanganisa noma ukuhlanganisa. Uma kudingekile ukuhlakaza imikhiqizo ye-HPMC ngokuhlukana, lolu chungechunge lwemikhiqizo kufanele lusetshenziswe ngokuqapha, njengoba luzohlanganisa futhi lubambe ndawonye. Uma kudingekile ukuhlakaza umkhiqizo we-HPMC we-hydroxypropyl methylcellulose engaphekiwe ngokuhlukana, udinga ukuhlakazwa ngokufanayo ngamanzi ashisayo angu-95°C, bese upholiswa ukuze incibilike.

Ekukhiqizeni kwangempela, lolu chungechunge lwemikhiqizo luvame ukuncibilika ngemva kokuhlakazwa nezinye izinto zezinhlayiya eziqinile ngaphansi kwezimo ze-alkaline, futhi izinga lokuchithwa kwalo alihlukile kunelemikhiqizo engelashiwe. Ibuye ifanele ukusetshenziswa emikhiqizweni echithwa yodwa, ngaphandle kwe-caking noma izigaxa. Imodeli ethile yomkhiqizo ingakhethwa ngokuvumelana nezinga lokuqedwa elidingwa ukwakhiwa.
Ngesikhathi senqubo yokwakha, kungakhathaliseki ukuthi udaka lukasimende noma i-slurry esekelwe ku-gypsum, iningi lazo liyizinhlelo ze-alkaline, futhi inani le-HPMC elingeziwe lincane kakhulu, elingahlakazwa ngokulinganayo phakathi kwalezi zinhlayiya. Lapho amanzi engezwa, i-HPMC izoncibilika ngokushesha.