Uyini umehluko phakathi kwe-HPMC ne-HEC?

I-HPMC (HYDROXYPROPYL Methylcellulose) ne-HEC (HydroxYethyl celtuleose) yi-cellulose derivativeves esetshenziswa kabanzi embonini kanye nemithi, kepha banokwehluka okubalulekile ekwakhiweni kwamakhemikhali, izakhiwo, izinkundla zohlelo lokusebenza, njll.

1. Umehluko ngesakhiwo samakhemikhali
I-HPMC ne-HEC Zombili lezi zimpi ze-cellulose zisebenza kusuka ku-cellulose yemvelo (njengokotini noma ukotini noma izinkuni), kepha ziyehluka ekuhlolweni:

I-HPMC (Hydroxypropyl Methylcellulose): I-HPMC itholakala ngokungenasici noma ngokuphelele amanye amaqembu ama-hydroxyl (-oh) we-cellulose nge-metrulose (-ch₃) ne-hydroxyproselyl (-ch₂ch (oh) ch₃) cellulose derivatives. Izinga lokufakwa esikhundleni se-methyl kanye ne-hydroxyproppyls linquma izakhiwo ze-HPMC.
I-HEC (HYDROXYETHY celtuleose): I-HEC yi-cellulose ether eyenziwe ngokubuyisela ingxenye yamaqembu ama-hydroxyls ngamaqembu we-hydroxyethyl (-ch₂chroh), ikakhulukazi i-hydroxyethyylition.
Lo mehluko kusakhiwo samakhemikhali uthinta ngqo i-solubility yabo, ukubonakala, nezinye izakhiwo zomzimba nezamakhemikhali.

2. I-Solubity kanye Nezimo Zokuchithwa
I-HPMC: I-HPMC ine-solubility enhle kakhulu yamanzi futhi ingachithwa emanzini abandayo ukwakha isixazululo esibonakalayo esibonakalayo. Ingachithwa futhi kuma-solvents ezi-organic afana ne-ethanol, i-acetone, njll., Kepha ijubane lokuchithwa kanye nezinto ziyahlukahluka ngokuya ngokuqukethwe okuthize. Isici esibalulekile se-HPMC ukuthi siyancibilika emanzi abandayo, kanti ngesikhathi sokushisa ikhambi likhuphuka i-gelation eshisayo (liphenduka ijeli lapho lifudumala futhi lincibilika lapho selipholile). Le mpahla ibaluleke kakhulu emikhakheni efana nokwakha nokumboza.

I-HEC: I-HEC ibuye ihlakaze emanzi abandayo, kepha ngokungafani ne-HPMC, i-HEC ayigxili emanzini ashisayo. Ngakho-ke, i-HEC ingasetshenziswa ngaphezulu kwebanga lokushisa elibanzi. I-HEC inokubekezelelana ngosawoti okuqinile kanye nokuqina kwezakhiwo futhi kufanelekile ukusetshenziswa kwizisombululo eziqukethe i-electrolyte.

3. I-Viscosity kanye Nezakhiwo Ze-Rheological
I-viscosity ye-HPMC ne-HEC iyahluka ngesisindo sayo samangqamuzana, futhi sobabili sinemiphumela emihle yokuqina ekugxileni okuhlukile:

I-HPMC: I-HPMC ibonisa i-Pseudoplasticity ephezulu (ie, i-Shear-Twning Properties) kusixazululo. I-viscosity yezixazululo ze-HPMC iyancipha lapho i-shear inyuka, ibenze balungele izinhlelo zokusebenza ezidinga ukusakazeka okulula noma ukuxubha, okufana nokupenda, izimonyo, njll.

I-HEC: Izixazululo ze-HEC zinokubonakala okuphezulu kanye nezakhiwo ezingcono zokuqina ezindaweni eziphansi ze-shear, kukhombisa i-Newtonian Flow Properties (okusho ukucindezelwa kweNewtonian Flow (okusho ukuthi i-Shear stress ilingana nezinga le-Shear). Ngaphezu kwalokho, izixazululo ze-HEC zinokushintshwa okuncane kwe-viscosity ezindaweni eziqukethe usawoti kanye nama-electrolyte, futhi aze akwazi ukumelana nosawoti. Zisetshenziswa kabanzi emasimini adinga ukumelana nosawoti, njengokukhishwa kwamafutha kanye nokwelashwa kodaka.

4. Umehluko ezinhlelweni zohlelo lokusebenza
Yize zombili i-HPMC ne-HEC zingasetshenziswa njengabakhulu, izinamathiseli, abakhethi befilimu, abaqinisi, njll, ukusebenza kwabo ezindaweni ezithile zohlelo lokusebenza kuyahluka:

Izicelo ze-HPMC:
Imboni yezokwakha: I-HPMC isetshenziswa njenge-ejenti yokuqina kanye ne-ejenti yokugcina amanzi emikhakheni yezinto zokwakha ezinjengesimende ngodaka, imikhiqizo ye-gypsum, nama-ceramic tile anamathela. Kuthuthukisa ukusebenziseka kodaka, kumelana nokugcwala, futhi kunwebe isikhathi esivulekile sodaka.
Izinkambu zezemithi nezokudla: Kwezokwelapha, i-HPMC ivame ukusetshenziswa njengezinto zokwakha amaphilisi nezinto zokwakha uhlaka lwamalungiselelo wokukhulula okulondoloziwe. Embonini yokudla, i-HPMC isetshenziswa njengesengezo sokudla, ikakhulukazi njenge-emulsifier, sikhulu, ne-stabilizer.
Imboni yamakhemikhali yansuku zonke: I-HPMC isetshenziswa njenge-emulsion stabilizer, isikhungo, kanye nokuvikela izithako ekwakheni ifilimu ezimotweni kanye nemikhiqizo yokunakekelwa komuntu siqu.

Izicelo ze-HEC:
Ukukhishwa kwamafutha: Njengoba i-HEC inokubekezelelana okuqinile kosawoti, ilungele ukusetshenziswa njenge-ejenti yokuqina yoketshezi lokumba kanye nokuphupha uketshezi ezindaweni eziphakeme zikasawoti ukuze uthuthukise izakhiwo ze-bhedi.
Umkhakha we-Coating: I-HEC isetshenziswa njengesikhudlwana kanye ne-stabilizer ezitsheni ezisuselwa emanzini. Kungathuthukisa uketshezi nokusebenza kokwakha kwe-coating futhi kuvikele ukunamathela kusuka ekuchithekeni.
Umkhakha we-Papermang and Textile: I-HEC ingahle isetshenziselwe ukugcwaliswa komhlaba ekwelapheni nasekwelashweni okumnandi emkhakheni wezindwangu ukuze uqweqwe, uzinze futhi ulungise izakhiwo ze-heological.

5. Ukuqina kwezemvelo nokuqina
I-HPMC: I-HPMC isetshenziswa kakhulu emasimini ezekhemisi nasekudlayo ngenxa yokufana kwayo okuhle kanye ne-biodegradabilibility. Izakhiwo zayo ze-gelling zakhona nazo zikunikeza izinzuzo ezihlukile ekunikezelweni okuthile okubucayi bokushisa kwemithi. Ngaphezu kwalokho, i-HPMC ayinankinga, ayithinteki ngama-electrolyte, futhi inokuqina okuhle ku-PH izinguquko.

I-HEC: I-HEC ibuye ibe ne-biocomptity enhle kanye ne-biodeGreatibility, kepha kukhombisa ukuzinza okukhulu ezindaweni ezinosawoti eziphakeme. Ngakho-ke, i-HEC iyindlela engcono lapho ukumelana nosawoti nokuphikiswa kwe-electrolyte kuyadingeka, njengokuhlola uwoyela, ubunjiniyela be-Offshore, njll.

I-6. Izindleko kanye nokunikezwa
Kusukela zombili i-HPMC ne-HEC zithathwe kusuka ku-cellulose yemvelo, ukuhlinzekwa kwezinto zokwakha eziluhlaza kuyazinza, kepha ngenxa yezinqubo ezahlukahlukene zokukhiqiza, izindleko zokukhiqiza ze-HPMC ziphakeme kancane kunalokho kwe-HEC. Lokhu kwenza i-HEC isetshenziswe kabanzi kwezicelo ezithile ezibucayi ezingabizi, njengezinto zokwakha, amakhemikhali e-oyela, njll.

I-HPMC ne-HEC zombili ezifuywayo ezifuywayo. Yize zihlukile ngesakhiwo samakhemikhali, zombili zinemisebenzi enjengokuqina, ukuzinza, ukugcinwa kwamanzi kanye nokwakha amafilimu. Ngokuya kokukhethwa kwesicelo esithile, i-hpmc ithatha isikhundla esibalulekile ekwakhiweni, ukulungiswa kwemithi kanye nezimboni zokudla ngenxa yezakhiwo zayo ezikhethekile zokugcina indawo eshisayo; Ngenkathi i-HEC idlala indima ebalulekile emkhakheni kaphethiloli ngenxa yokubekezelelana ngosawoti okuhle nokuzimela okushisa kakhulu. Inzuzo eyengeziwe ezimbizeni nasezimbobeni ezisuselwa emanzini. Ngokuya ngezidingo ezihlukile zohlelo lokusebenza, ukhetha ama-decivatives afanele amaselula angathuthukisa ukusebenza komkhiqizo kanye nezinzuzo zezomnotho.