Umahluko phakathi kwe-HPMC kunye ne-HEC

Zombini i-hydroxypropyl methylcellulose kunye ne-hydroxyethyl cellulose ziyi-cellulose, yintoni umahluko phakathi kwezi zimbini?

"Umahluko Phakathi kwe-HPMC kunye ne-HEC"

01 I-HPMC kunye ne-HEC
IHydroxypropyl methylcellulose (Hypromellose), eyaziwa ngokuba yihypromellose, luhlobo lwe-non-ionic cellulose mixed ether. Yipolymer eyi-semisynthetic, engasebenziyo, ne-viscoelastic esetyenziswa kakhulu njenge-lubricant kwi-ophthalmology, okanye njenge-excipient okanye isithuthi kumayeza athethwayo.
I-Hydroxyethyl cellulose (HEC), ifomula yekhemikhali (C2H6O2)n, sisixhobo esimhlophe okanye esikhanyayo esityheli, esingenavumba, esingenatyhefu, esiqinileyo okanye esinomgubo esenziwe yi-alkaline cellulose kunye ne-ethylene oxide (okanye i-chloroethanol). Ilungiswa nge-etherification kwaye ikwi-non-ionic soluble cellulose ethers. Ngenxa yokuba i-HEC ineempawu ezilungileyo zokutyeba, ukumisa, ukusasaza, ukuhlanganisa, ukubopha, ukwenza ifilimu, ukukhusela umswakama kunye nokubonelela nge-colloid ekhuselayo, isetyenziswa kakhulu ekuhloleni ioyile, ukugquma, ukwakha, amayeza nokutya, ilaphu, iphepha kunye ne-polymer Polymerization kunye nezinye iindawo, izinga lokusila le-mesh elingama-40 ≥ 99%.

02 umahluko
Nangona zombini ziyi-cellulose, kukho umahluko omkhulu phakathi kwezi zimbini:
I-Hydroxypropyl methylcellulose kunye ne-hydroxyethylcellulose zahlukile kwiipropati, kwiindlela ezisetyenziswa ngazo, nakwindlela ezinyibilikayo ngayo.

1. Iimpawu ezahlukeneyo
I-Hydroxypropyl methylcellulose: (HPMC) yifayibha emhlophe okanye efana nayo emhlophe okanye umgubo wegranular, oyinxalenye yee-ethers ezahlukeneyo ze-nonionic cellulose mixed. Yi-polymer ye-viscoelastic engaphiliyo eyenziweyo.
I-Hydroxyethylcellulose: (HEC) yifayibha emhlophe okanye etyheli, engenavumba kwaye engenatyhefu okanye i-powder solid. Inyibilikiswa yi-alkaline cellulose kunye ne-ethylene oxide (okanye i-chlorohydrin). Yeyase-non-ionic soluble cellulose ether.

2. Ukunyibilika okwahlukileyo
I-Hydroxypropyl methylcellulose: ayinyibiliki phantse kwi-ethanol epheleleyo, i-ether kunye ne-acetone. Isisombululo se-colloidal esicacileyo okanye esinamafu kancinci sinyibilikiswe emanzini abandayo.
I-Hydroxyethyl cellulose: Ineempawu zokutyeba, ukuxhoma, ukubopha, ukuxuba, ukusasaza kunye nokufumisa. Ingalungiselela izisombululo kwiindidi ezahlukeneyo ze-viscosity kwaye inokunyibilika kwetyuwa okuhle kakhulu kwii-electrolytes.
I-Hydroxypropyl methylcellulose ineempawu zokuba namandla okutyeba, ukumelana netyuwa ephantsi, uzinzo lwe-pH, ukugcinwa kwamanzi, uzinzo olulinganayo, iipropati ezintle zokwenza ifilimu, ukumelana okukhulu kwee-enzyme, ukusasazeka kunye nokuhambelana.

Kukho umahluko omkhulu phakathi kwezi zimbini, kwaye ukusebenziseka kwazo kushishino nako kwahlukile kakhulu.

I-Hydroxypropyl methylcellulose isetyenziswa kakhulu njenge-thickener, dispersant kunye ne-stabilizer kwishishini lokugquma, kwaye inokunyibilika kakuhle emanzini okanye kwizinyibilikisi ze-organic. Kwishishini lokwakha, ingasetyenziswa kwisamente, i-gypsum, i-latex putty, i-plaster, njl.njl., ukuphucula ukusasazeka kwesanti yesamente kunye nokuphucula kakhulu i-plasticity kunye nokugcinwa kwamanzi kwi-mortar.
I-Hydroxyethyl cellulose ineempawu zokutyeba, ukuxhoma, ukubopha, ukuxuba, ukusasaza kunye nokufumisa. Ingalungiselela izisombululo kwiindidi ezahlukeneyo ze-viscosity kwaye inokunyibilika kakuhle kwetyuwa kwii-electrolytes. I-Hydroxyethyl cellulose yi-film former esebenzayo, i-tackifier, i-thickener, i-stabilizer kunye ne-dispersant kwii-shampoos, ii-hair sprays, ii-neutralizers, ii-conditioners kunye nee-cosmetics; kwi-washing powders. Embindini kukho uhlobo lwe-arhente yokubuyisela ukungcola. I-Hydroxyethyl cellulose iyanyibilika ngokukhawuleza kubushushu obuphezulu, nto leyo enokukhawulezisa inkqubo yemveliso kwaye iphucule ukusebenza kakuhle kwemveliso. Uphawu olucacileyo lweesepha eziqulethe i-hydroxyethyl cellulose kukuba inokuphucula ukuguda kunye ne-mercerization yamalaphu.