IHydroxypropyl Methylcellulose (HPMC)kwayeI-Methylcellulose (MC)zizinto ezimbini eziqhelekileyo ze-cellulose derivatives, ezinomahluko obalulekileyo kwisakhiwo sekhemikhali, iipropati kunye nokusetyenziswa. Nangona izakhiwo zabo zeemolekyuli zifana, zombini zifunyenwe ngokuguqulwa kweekhemikhali ezahlukeneyo kunye neselulosi njengesiseko samathambo, kodwa iipropati kunye nokusetyenziswa kwazo kwahlukile.
1. Umahluko kwisakhiwo sekhemikhali
I-Methylcellulose (MC): I-Methylcellulose ifunyenwe ngokuzisa amaqela e-methyl (-CH₃) kwii-molecule ze-cellulose. Ubume bayo kukwazisa amaqela e-methyl kumaqela e-hydroxyl (-OH) yee-molecule ze-cellulose, ngokuqhelekileyo ithatha indawo enye okanye ngaphezulu kweqela le-hydroxyl. Esi sakhiwo senza i-MC ibe ne-solubility ethile yamanzi kunye ne-viscosity, kodwa ukubonakaliswa okuthe ngqo kwe-solubility kunye neempawu zichaphazelekayo ngumlinganiselo we-methylation.
IHydroxypropyl Methylcellulose (HPMC): I-HPMC yimveliso eyongezelelweyo elungisiweyo ye-methylcellulose (MC). Ngokwesiseko se-MC, i-HPMC yazisa i-hydroxypropyl (-CH₂CH (OH)CH₃) amaqela. Ukuqaliswa kwe-hydroxypropyl kuphucula kakhulu ukunyibilika kwayo emanzini kunye nokuphucula ukuzinza kwayo kwe-thermal, ukungafihli kunye nezinye iimpawu zomzimba. I-HPMC inamaqela amabini e-methyl (-CH₃) kunye ne-hydroxypropyl (-CH₂CH (OH)CH₃) kwisakhiwo sayo sekhemikhali, ngoko ke i-soluble yamanzi kune-MC ecocekileyo kwaye inozinzo oluphezulu lwe-thermal.
2. Ukunyibilika kunye nokuhanjiswa kwamanzi
I-Solubility ye-MC: I-Methylcellulose ine-solubility ethile emanzini, kwaye ukunyibilika kuxhomekeke kwiqondo le-methylation. Ngokuqhelekileyo, i-methylcellulose ine-solubility ephantsi, ngakumbi emanzini abandayo, kwaye ngokuqhelekileyo kuyimfuneko ukutshisa amanzi ukukhuthaza ukuchithwa kwayo. I-MC echithiweyo ine-viscosity ephezulu, ekwayinto ebalulekileyo kwizicelo ezininzi zoshishino.
Ukunyibilika kwe-HPMC: Ngokwahlukileyo, i-HPMC inonyibiliko olungcono lwamanzi ngenxa yokuqaliswa kwe-hydroxypropyl. Inokunyibilika ngokukhawuleza emanzini abandayo, kwaye izinga lokuchithwa kwayo likhawuleza kune-MC. Ngenxa yempembelelo ye-hydroxypropyl, i-solubility ye-HPMC ayiphuculwanga kuphela kumanzi abandayo, kodwa kunye nokuzinza kwayo kunye nokungafihli emva kokuchithwa kuphuculwe. Ngoko ke, i-HPMC ifaneleke ngakumbi kwizicelo ezifuna ukuchithwa ngokukhawuleza.
3. Ukuzinza kwe-thermal
Ukuzinza kwe-Thermal ye-MC: I-Methylcellulose inozinzo olubi lwe-thermal. I-solubility yayo kunye ne-viscosity iya kutshintsha kakhulu kwiqondo lokushisa eliphezulu. Xa izinga lokushisa liphezulu, ukusebenza kwe-MC kuchaphazeleka ngokulula kukubola kwe-thermal, ngoko ke ukusetyenziswa kwayo kwindawo yokushisa ephezulu kuxhomekeke kwimiqathango ethile.
Ukuzinza kwe-Thermal ye-HPMC: Ngenxa yokuqaliswa kwe-hydroxypropyl, i-HPMC inozinzo olungcono lwe-thermal kune-MC. Ukusebenza kwe-HPMC kuzinzile kumaqondo obushushu aphezulu, ngoko kunokugcina iziphumo ezilungileyo kuluhlu olubanzi lobushushu. Ukuzinza kwayo kwe-thermal kwenza ukuba isetyenziswe ngokubanzi phantsi kweemeko ezithile zokushisa eziphezulu (ezifana nokutya kunye nokulungiswa kweziyobisi).
4. Iimpawu zeViscosity
I-Viscosity ye-MC: I-Methyl cellulose ine-viscosity ephezulu kwisisombululo samanzi kwaye idla ngokusetyenziswa kwiimeko apho kufuneka i-viscosity ephezulu, njengama-thickeners, i-emulsifiers, njl njl. Iqondo eliphezulu le-methylation liya kwandisa i-viscosity yesisombululo.
I-Viscosity ye-HPMC: I-viscosity ye-HPMC idla ngokuba ngaphantsi kancinane kune-MC, kodwa ngenxa yokunyibilika kwayo okuphezulu kwamanzi kunye nokuphuculwa kozinzo lwe-thermal, i-HPMC ifanelekile ngakumbi kune-MC kwiimeko ezininzi apho kufuneka ulawulo lwe-viscosity olungcono. I-viscosity ye-HPMC ichaphazeleka bubunzima be-molecular, i-concentration yesisombululo kunye nobushushu bokutshatyalaliswa.
5. Umahluko kwiinkalo zesicelo
Ukusetyenziswa kwe-MC: I-Methyl cellulose isetyenziswa ngokubanzi ekwakheni, iingubo, ukulungiswa kokutya, amayeza, izimonyo kunye nezinye iinkalo. Ngokukodwa kwintsimi yokwakha, sisongezo sezinto zokwakha eziqhelekileyo ezisetyenziselwa ukuqina, ukuphucula ukubambelela kunye nokuphucula ukusebenza kokwakhiwa. Kwishishini lokutya, i-MC ingasetyenziswa njenge-thickener, emulsifier kunye ne-stabilizer, kwaye ifumaneka ngokuqhelekileyo kwiimveliso ezifana nejeli kunye ne-ayisikrimu.
Ukusetyenziswa kwe-HPMC: I-HPMC isetyenziswa ngokubanzi kumayeza, ukutya, ukwakhiwa, izithambiso kunye namanye amashishini ngenxa yokunyibilika kwayo okugqwesileyo kunye nokuzinza kwe-thermal. Kwishishini lamachiza, i-HPMC isetyenziswa rhoqo njenge-excipient yeziyobisi, ngakumbi kumalungiselelo omlomo, njengefilimu yangaphambili, i-thickener, i-ejenti yokukhululwa okuqhubekayo, njl. Kwishishini lokutya, i-HPMC isetyenziswa njenge-thickener kunye ne-emulsifier yokutya okuphantsi kweekhalori, kwaye isetyenziswa ngokubanzi kwi-salad dressings, ukutya okufriziwe kunye nezinye iimveliso.
6. Ukuthelekiswa kwezinye iipropati
Ukungafihli: Izisombululo ze-HPMC zidla ngokuba nokungafihlisi okuphezulu, ngoko ke zifaneleke ngakumbi kwizicelo ezifuna inkangeleko engafihliyo okanye eguquguqukayo. Izisombululo ze-MC zihlala zine-turbid.
I-Biodegradability kunye nokhuseleko: Zombini zine-biodegradability elungileyo, zinokonakaliswa ngokwemvelo yimekobume phantsi kweemeko ezithile, kwaye zithathwa njengekhuselekile kwizicelo ezininzi.
HPMCkwayeMCzizinto zombini ezifunyenwe ngokuguqulwa kwe-cellulose kwaye zinezakhiwo ezisisiseko ezifanayo, kodwa zineeyantlukwano ezinkulu kwi-solubility, ukuzinza kwe-thermal, i-viscosity, i-transparency, kunye neendawo zokusebenza. I-HPMC ine-solubility engcono yamanzi, ukuzinza kwe-thermal, kunye nokungafihli, ngoko ifaneleka ngakumbi kwizihlandlo ezifuna ukutshatyalaliswa ngokukhawuleza, ukuzinza kwe-thermal, kunye nenkangeleko. I-MC isetyenziswa ngokubanzi kwizihlandlo ezifuna i-viscosity ephezulu kunye nokuzinza okuphezulu ngenxa ye-viscosity ephezulu kunye nesiphumo esihle sokuqina.
Ixesha lokuposa: Apr-06-2025