I-HEC kunye ne-HPMC

I-Hydroxyethyl Cellulose (HEC)kwayeIHydroxypropyl Methylcellulose (HPMC)zombini zii-non-ionic, zi-water-soluble cellulose ethers ezithathwe kwi-cellulose yendalo. Zisetyenziswa kakhulu kwimizi-mveliso, amayeza, ukhathalelo lomntu, kunye nokusetyenziswa kokutya ngenxa yeempawu zazo ezibalaseleyo zokutyeba, ukwenza ifilimu, ukuzinzisa, kunye nokuxubha. Nangona zabelana ngokufana okuthile ngemvelaphi kunye nomsebenzi, umahluko wazo kwisakhiwo seekhemikhali uphumela kwiimpawu zomzimba ezahlukeneyo kunye nokusetyenziswa.

1. Imvelaphi kunye nolwakhiwo lweekhemikhali

Ii-Ether zeCellulose

Zombini i-HEC kunye ne-HPMC zenziwe ngokuguqula i-cellulose yendalo ngokweekhemikhali, eyi-polymer eyenziwe ziiyunithi ze-β-D-glucose ezidityaniswe ziibhondi ze-glycosidic ze-β(1→4). I-Cellulose ngokwayo ayinyibiliki emanzini, kodwa ngokuguqulwa kweekhemikhali, inokuguqulwa ibe zizinto eziphuma emanzini.

I-Hydroxyethyl Cellulose (HEC)

I-HEC yenziwa ngokuphendula i-cellulose nge-ethylene oxide, ingenisa amaqela e-hydroxyethyl (-CH2CH2OH) kwi-polymer chain. Olu tshintsho lunyusa ukunyibilika kwamanzi kwaye luphucula amandla e-polymer okwenza izisombululo ezicacileyo nezizinzileyo. Ukutshintshwa kwenzeka ikakhulu kwiindawo ze-hydroxyl (-OH) zeeyunithi ze-anhydroglucose kwi-cellulose chain.

IHydroxypropyl Methylcellulose (HPMC)

I-HPMC yenziwa ngokuphendula i-cellulose nge-methyl chloride kunye ne-propylene oxide, nto leyo ebangela ukuba amaqela e-hydroxyl atshintshwe ngamaqela e-methoxy (-OCH3) kunye ne-hydroxypropyl (-CH2CHOHCH3). Umlinganiselo womxholo we-methoxy kwi-hydroxypropyl unokwahluka ukuze kulungiswe iipropati ze-polymer.

2. Iimpawu ezibonakalayo

Ukunyibilika

I-HEC: Iyanyibilika emanzini ashushu nabandayo, yenze izisombululo ezicacileyo neziqinileyo. Ayinyibiliki kwiintlambululo ezininzi zezinto eziphilayo.

I-HPMC: Ikwanyibilika emanzini abandayo kodwa yenza ijeli xa ishushu. Ayinyibiliki emanzini ashushu kodwa iyadumba kwaye yenze iijeli eziguqukayo xa ishushu, nto leyo eluncedo ekuhanjisweni kwamayeza akhutshwa ngokulawulwayo. Amanye amanqanaba asenokunyibilika nakwizinyibilikisi zendalo ezifana ne-ethanol okanye i-acetone.

Ukuqaqamba

Zombini i-HEC kunye ne-HPMC zinokwenziwa kwiindidi ezahlukeneyo ze-viscosity. Izisombululo ze-HEC ngokubanzi zibonelela ngokucaca okuphezulu kwaye azinabungozi kangako kubushushu. I-viscosity ye-HPMC idla ngokuba nokuzinza ngakumbi kuluhlu olubanzi lwe-pH (3–11) kwaye inesimo esihle se-pseudoplastic (ukunciphisa ukucheba), nto leyo eluncedo kwiingubo kunye namayeza.

Ukufudumala kwe-Thermal

I-HEC: Ayibonisi i-thermal gelation.

I-HPMC: Ibonisa i-thermal gelation. Xa ifudunyezwa, isisombululo se-polymer sitshintsha ngokwesigaba, siguquke sibe yi-gel. Oku kusetyenziswa ekutyeni nakwimithi.

3. Iipropati zokusebenza

4. Izicelo

I-Hydroxyethyl Cellulose (HEC)

I-HEC isetyenziswa kakhulu kwizicelo ezifuna ulawulo lwe-viscosity kunye nokuzinzisa, ingakumbi kwiinkqubo ezisekelwe emanzini.

Iipeyinti kunye neengubo: Zisetyenziswa njengesithambisi kunye nesiqinisi ukuthintela ukuhla kwemibala kunye nokuphucula iimpawu zokusetyenziswa.

Ukhathalelo Lomntu: Lufumaneka kwiishampu, kwii-conditioner, nakwii-lotions ngenxa yeempawu zalo zokutyeba kunye nokuguqula i-rheology.

Amayeza: Asetyenziswa njengesihlanganisi kunye nesithambisi kwimixube esetyenziswa ngaphandle.

Ulwakhiwo: Kwisamente nakwisigqubuthelo njengesixhobo sokugcina amanzi nokuphucula ukusebenza kakuhle.

Iikhemikhali ze-Oilfield: Zisetyenziswa kwiincindi zokubhola ukulawula i-viscosity kunye nokuthintela ukulahleka kolwelo.

IHydroxypropyl Methylcellulose (HPMC)

I-HPMC iphawuleka ngokuguquguquka kwayo kwiinkqubo zokuhambisa amayeza ezisebenzisa amanzi kunye nezilawulwayo kwaye njengesixhobo sokubopha okanye sokufaka ifilimu.

Amayeza: Asetyenziswa kakhulu kwiipilisi eziselwayo (njenge-binder, i-coating agent, okanye i-matrix for release ende), izisombululo zamehlo, kunye neejeli ezisetyenziswa ngaphandle.

Ishishini Lokutya: Livunyiwe njengesongezo sokutya (E464) kwaye lisetyenziswa njenge-thickener, emulsifier, kunye ne-stabilizer.

Ulwakhiwo: Isetyenziswa kwiimortars ezomileyo, ii-adhesives zethayile, kunye neeplaster ukuphucula ukugcinwa kwamanzi, ukunamathela, kunye nokusebenza kakuhle.

Izithambiso: Zisetyenziswa kwiikhrimu, iijeli, kunye namaconsi amehlo.

Iipeyinti: Zifana ne-HEC, ezisetyenziswa kwimixube esekwe emanzini yokulawula i-rheology

5. Umahluko oPhambili

6. Ukhuseleko kunye nokuhambelana kwezinto eziphilayo

Zombini i-HEC kunye ne-HPMC zithathwa njengezikhuselekileyo kwaye azinabungozi. Azifunxwa ngokwenkqubo xa zisetyenziswa ngaphandle okanye ngomlomo kumanqanaba aqhelekileyo. I-HPMC inesimo se-GRAS (Ngokubanzi iyaziwa njengeSafe) kwaye isetyenziswa kakhulu kumashishini amayeza nokutya ngenxa yokuhambelana kwayo kakuhle kwezinto eziphilayo kunye nokwamkelwa kwayo ngokwemithetho.

I-HEC kwaye I-HPMC ziyasebenziseka ngeendlela ezahlukeneyo, iipolymers ezinyibilikayo emanzini ezineempawu ezahlukeneyo ezenzelwe iimfuno ezithile zoshishino kunye namayeza. Nangona zombini zibonelela ngemisebenzi emihle yokutyeba nokuzinzisa, i-HPMC ivelele kwizicelo zamayeza nokutya ngenxa yokufudumala kwayo kunye nokuhambelana kwayo nezinto eziphilayo. I-HEC, kwelinye icala, ixhaphake kakhulu kwizicelo ezisekelwe emanzini ezifana neepeyinti kunye nezinto zokuthambisa ngenxa yokucaca kwayo kunye nokuhambelana kwayo kwiinkqubo zamanzi.