Umehluko Phakathi kwe-HPMC ne-HEC

Kokubili i-hydroxypropyl methylcellulose kanye ne-hydroxyethyl cellulose kuyi-cellulose, uyini umehluko phakathi kwalokhu okubili?

"Umehluko Phakathi kwe-HPMC ne-HEC"

01 I-HPMC kanye ne-HEC
I-Hydroxypropyl methylcellulose (Hypromellose), eyaziwa nangokuthi i-hypromellose, uhlobo lwe-non-ionic cellulose mixed ether. Iyi-polymer eyi-semi-synthetic, engasebenzi, ne-viscoelastic evame ukusetshenziswa njenge-lubricant ku-ophthalmology, noma njenge-excipient noma isithuthi emithini yomlomo.
I-Hydroxyethyl cellulose (HEC), ifomula yamakhemikhali (C2H6O2)n, iyisiqina esimhlophe noma esikhanyayo esiphuzi, esingenaphunga, esingenabo ubuthi esinama-fibrous noma esiwuphuphu esakhiwe yi-alkaline cellulose kanye ne-ethylene oxide (noma i-chloroethanol). Ilungiswa nge-etherification futhi ingeyama-non-ionic soluble cellulose ethers. Ngenxa yokuthi i-HEC inezakhiwo ezinhle zokujiya, ukumiswa, ukuhlakazwa, ukuhlanganiswa, ukwakheka kwefilimu, ukuvikela umswakama kanye nokunikeza i-colloid evikelayo, isetshenziswe kabanzi ekuhlolweni kwamafutha, ukumbozwa, ukwakhiwa, imithi kanye nokudla, izindwangu, iphepha kanye ne-polymer I-polymerization kanye neminye imikhakha, izinga lokusikwa kwe-mesh elingu-40 ≥ 99%.

02 umehluko
Nakuba zombili ziyi-cellulose, kunezinhlobo eziningi ezahlukene zalezi zinto:
I-hydroxypropyl methylcellulose kanye ne-hydroxyethylcellulose ziyahlukahluka ngezakhiwo, ukusetshenziswa, kanye nokuncibilika.

1. Izici Ezihlukene
I-Hydroxypropyl methylcellulose: (HPMC) iyi-fiber emhlophe noma efana nayo noma i-granular powder, etholakala kuma-ether ahlukahlukene axubile e-nonionic cellulose. Iyi-polymer ye-viscoelastic engaphili eyenziwe ngokwengxenye.
I-Hydroxyethylcellulose: (HEC) iyi-fiber noma i-powder solid emhlophe noma ephuzi, engenaphunga futhi engenabo ubuthi. Iqiniswa yi-alkaline cellulose kanye ne-ethylene oxide (noma i-chlorohydrin). Ingeye-non-ionic soluble cellulose ether.

2. Ukuncibilika okuhlukile
I-Hydroxypropyl methylcellulose: cishe ayincibiliki ku-ethanol ephelele, i-ether kanye ne-acetone. Isixazululo se-colloidal esicacile noma esinamafu kancane sincibilikiswe emanzini abandayo.
I-Hydroxyethyl cellulose: Inezakhiwo zokujiya, ukumisa, ukubopha, ukuhlanganisa, ukuhlakaza kanye nokufumisa. Ingalungisa izixazululo ezinhlotsheni ezahlukene ze-viscosity futhi inokuncibilika okuhle kakhulu kosawoti kuma-electrolyte.
I-Hydroxypropyl methylcellulose inezici zekhono lokujiya, ukumelana nosawoti ophansi, ukuqina kwe-pH, ukugcinwa kwamanzi, ukuqina kobukhulu, izakhiwo ezinhle kakhulu zokwakha ifilimu, ukumelana okukhulu kwama-enzyme, ukuhlakazeka kanye nokuhlangana.

Kunomehluko omkhulu phakathi kwalokhu okubili, futhi ukusebenza kwazo embonini nakho kuhlukile kakhulu.

I-Hydroxypropyl methylcellulose isetshenziswa kakhulu njenge-thickener, dispersant kanye ne-stabilizer embonini yokumboza, futhi inokuncibilika okuhle emanzini noma ezinyibilikisini eziphilayo. Embonini yokwakha, ingasetshenziswa kusimende, i-gypsum, i-latex putty, i-plaster, njll., ukuthuthukisa ukuhlakazeka kwesihlabathi sesimende nokuthuthukisa kakhulu i-plasticity kanye nokugcinwa kwamanzi kwesimende.
I-Hydroxyethyl cellulose inezimpawu zokujiya, ukumiswa, ukubopha, ukuhlanganisa, ukusabalalisa kanye nokuthambisa. Ingalungisa izixazululo ezinhlotsheni ezahlukene ze-viscosity futhi inokuncibilika okuhle kakhulu kwe-electrolytes. I-Hydroxyethyl cellulose iyi-film former esebenzayo, i-tackifier, i-thickener, i-stabilizer kanye ne-dispersant kuma-shampoo, ama-hair spray, ama-neutralizer, ama-conditioner kanye nezimonyo; kuma-washing powders. Phakathi kukhona uhlobo lwe-ejenti yokubuyisela ukungcola. I-Hydroxyethyl cellulose iyancibilika ngokushesha ekushiseni okuphezulu, okungasheshisa inqubo yokukhiqiza futhi kuthuthukise ukusebenza kahle kokukhiqiza. Isici esisobala sezinsipho eziqukethe i-hydroxyethyl cellulose ukuthi ingathuthukisa ukushelela kanye ne-mercerization yezindwangu.