I-HEC kanye ne-HPMC

I-Hydroxyethyl Cellulose (HEC)futhiI-Hydroxypropyl Methylcellulose (HPMC)Zombili ziyi-non-ionic, i-cellulose ethers encibilikayo emanzini etholakala ku-cellulose yemvelo. Zisetshenziswa kabanzi ezimbonini, kwezemithi, ekunakekelweni komuntu siqu, kanye nasekusetshenzisweni kokudla ngenxa yezakhiwo zazo ezinhle kakhulu zokuqina, ukwakha ifilimu, ukuzinza, kanye nokuxuba. Ngenkathi zabelana ngokufana okuthile ngemvelaphi kanye nomsebenzi, umehluko wazo esakhiweni samakhemikhali uholela ezicini zomzimba ezihlukile kanye nezicelo.

1. Imvelaphi kanye nesakhiwo samakhemikhali

Ama-Ether e-Cellulose

Kokubili i-HEC kanye ne-HPMC kwakheka ngokushintsha i-cellulose yemvelo ngamakhemikhali, okuyi-polymer eyakhiwe amayunithi e-β-D-glucose axhunywe yizibopho ze-glycosidic ze-β(1→4). I-Cellulose ngokwayo ayincibiliki emanzini, kodwa ngokuguqulwa kwamakhemikhali, ingaguqulwa ibe yizinto ezincibilika emanzini.

I-Hydroxyethyl Cellulose (HEC)

I-HEC yakhiwa ngokusabela kwe-cellulose ne-ethylene oxide, kwethula amaqembu e-hydroxyethyl (-CH2CH2OH) eceleni kwe-polymer chain. Lokhu kuguqulwa kwandisa ukuncibilika kwamanzi futhi kuthuthukisa ikhono le-polymer lokwakha izixazululo ezicacile nezizinzile. Ukufakwa esikhundleni kwenzeka ikakhulukazi ezindaweni ze-hydroxyl (-OH) zamayunithi e-anhydroglucose ku-cellulose chain.

I-Hydroxypropyl Methylcellulose (HPMC)

I-HPMC yenziwa ngokuhlanganisa i-cellulose ne-methyl chloride kanye ne-propylene oxide, okuholela ekufakweni kwamaqembu e-hydroxyl ngamaqembu e-methoxy (-OCH3) kanye ne-hydroxypropyl (-CH2CHOHCH3). Isilinganiso sokuqukethwe kwe-methoxy ku-hydroxypropyl singashintshwa ukuze kulungiswe izakhiwo ze-polymer.

2. Izakhiwo Ezibonakalayo

Ukuncibilika

I-HEC: Incibilika emanzini ashisayo nabandayo, yakha izixazululo ezicacile neziqinile. Ayincibiliki ezincibilikisini eziningi zezinto eziphilayo.

I-HPMC: Iphinde incibilike emanzini abandayo kodwa yakha ijeli uma ishiswa. Ayincibiliki emanzini ashisayo kodwa iyavuvukala futhi yakhe amajeli aguqukayo lapho ishiswa, okuwusizo ekulethweni kwemithi ekhishwa ngokulawulwa. Amanye amazinga angase ancibilike nasezincibilikisini eziphilayo ezifana ne-ethanol noma i-acetone.

Ukuthamba

Kokubili i-HEC ne-HPMC kungenziwa ngama-viscosity grades ahlukahlukene. Izixazululo ze-HEC ngokuvamile zinikeza ukucaca okuphezulu futhi azizweli kakhulu ekushiseni. I-viscosity ye-HPMC ivame ukuba nozinzo kakhulu ebangeni elibanzi le-pH (3–11) futhi inokuziphatha okuhle kwe-pseudoplastic (ukunciphisa ukugunda izinwele), okuzuzisayo ekumbozweni nasemithini.

Ukushisa Okushisayo

I-HEC: Ayibonisi i-thermal gelation.

I-HPMC: Ibonisa i-gelation yokushisa. Lapho ifudumala, isixazululo se-polymer sidlula ekushintsheni kwesigaba, siphenduke ijeli. Lokhu kusetshenziswa ekudleni nasekwenzeni imithi.

3. Izakhiwo Ezisebenzayo

4. Izicelo

I-Hydroxyethyl Cellulose (HEC)

I-HEC isetshenziswa kabanzi ezinhlelweni ezidinga ukulawulwa kwe-viscosity kanye nokuzinza, ikakhulukazi ezinhlelweni ezisekelwe emanzini.

Upende Nokumboza: Kusetshenziswa njengesithambisi kanye nesiqinisi ukuvimbela ukuqina kombala nokuthuthukisa izakhiwo zokusetshenziswa.

Ukunakekelwa Komuntu Siqu: Kutholakala kuma-shampoo, ama-conditioner, kanye nama-lotion ngenxa yezakhiwo zayo zokujiya kanye nokuguqula i-rheology.

Imithi: Isetshenziswa njenge-binder kanye ne-thickener ekwakhiweni kwangaphandle.

Ukwakhiwa: Kusimende nodaka njenge-ejenti yokugcina amanzi nokuthuthukisa ukusebenza kahle.

Amakhemikhali e-Oilfield: Asetshenziswa ekubholeni uketshezi lokulawula ukujiya kanye nokuvimbela ukulahleka koketshezi.

I-Hydroxypropyl Methylcellulose (HPMC)

I-HPMC iphawuleka ngokuguquguquka kwayo kokubili ezinhlelweni zokulethwa kwemithi ephiliswa ngamanzi kanye nelawulwayo kanye nanjengesihlanganisi noma i-film form.

Imithi: Isetshenziswa kabanzi kumaphilisi omlomo (njenge-binder, i-coating agent, noma i-matrix for release eqhubekayo), izixazululo zamehlo, kanye nama-gel angaphandle.

Imboni Yokudla: Kuvunyelwe njengesithasiselo sokudla (E464) futhi kusetshenziswa njengesithako sokuqinisa, i-emulsifier, kanye nesiqinisi.

Ukwakhiwa: Kusetshenziswa kuma-mortar axutshwe okomile, ama-adhesive amathayili, nama-plaster ukuze kuthuthukiswe ukugcinwa kwamanzi, ukunamathela, kanye nokusebenza kahle.

Izimonyo: Zisetshenziswa kuma-creams, ama-gel, kanye namaconsi amehlo.

Amapende: Afana ne-HEC, asetshenziswa ekwakhiweni okusekelwe emanzini ukulawula i-rheology

5. Umehluko Obalulekile

6. Ukuphepha Nokuhambisana Nezinto Eziphilayo

Kokubili i-HEC ne-HPMC kubhekwa njengokuphephile nokungewona ubuthi. Azimuncwa ngendlela ehlelekile uma zisetshenziswa ngaphandle noma ngomlomo ngamanani ajwayelekile. I-HPMC inesimo se-GRAS (Ngokuvamile Eyaziwa njengeSafe) futhi isetshenziswa kabanzi ezimbonini zemithi nezokudla ngenxa yokuhambisana kwayo okuhle kakhulu kwezinto eziphilayo kanye nokwamukelwa kwayo ngokomthetho.

I-HEC futhi I-HPMC ziyahlukahluka, ama-polymer ancibilika emanzini anezakhiwo ezihlukile ezenzelwe izidingo ezithile zezimboni nezemithi. Nakuba womabili enikeza imisebenzi emihle kakhulu yokujiya nokuzinzisa, i-HPMC ivelele ekusetshenzisweni kwemithi nokudla ngenxa yokushisa kwayo kanye nokuhambisana kwayo nezinto eziphilayo. I-HEC, ngakolunye uhlangothi, ivame kakhulu ekusetshenzisweni okusekelwe emanzini njengopende nezimonyo ngenxa yokucaca kwayo kanye nokuvumelana kwayo ezinhlelweni zamanzi.