Hydroxypropyl methylcellulose (HPMC) ipolymer inonyungudika mumvura, inoshandiswa zvakanyanya mumishonga, zvizoro, chikafu uye maindasitiri, kunyanya mukugadzira majeli. Hunhu hwayo hwepanyama uye maitiro ayo ekunyungudika zvine simba guru pakushanda kwayo mumashandisirwo akasiyana. Kupisa kwegelation yejeli yeHPMC ndeimwe yehunhu hwayo hwepanyama, iyo inokanganisa zvakananga mashandiro ayo mukugadzirira kwakasiyana-siyana, senge kuburitswa kwakadzorwa, kugadzirwa kwefirimu, kugadzikana, nezvimwewo.
1. Maumbirwo uye hunhu hweHPMC
HPMC ipolymer inonyungudika mumvura inowanikwa nekuisa zvinhu zviviri zvinotsiva, hydroxypropyl nemethyl, mu cellulose molecular skeleton. Maumbirwo ayo emamorekuru ane mhando mbiri dzezvinhu zvinotsiva: hydroxypropyl (-CH2CHOHCH3) nemethyl (-CH3). Zvinhu zvakaita sehuwandu hwakasiyana hwehydroxypropyl, huwandu hwemethylation, uye huwandu hwepolymerization zvichave nemhedzisiro yakakosha pakunyungudika, maitiro egelling, uye hunhu hwemakanika hweHPMC.
Mumvura inobuda, AnxinCel®HPMC inoumba mhinduro dzakagadzikana dzecolloidal nekugadzira hydrogen bonds nemamorekuru emvura uye kubatana neskeleton yayo ine cellulose. Kana nharaunda yekunze (yakadai setembiricha, simba reionic, nezvimwewo) ikachinja, kudyidzana kuripo pakati pemamorekuru eHPMC kunochinja, zvichikonzera gelation.
2. Tsanangudzo uye zvinhu zvinopesvedzera tembiricha ye gelation
Kupisa kweGelation (Gelation Temperature, T_gel) zvinoreva tembiricha apo mhinduro yeHPMC inotanga kuchinja kubva mumvura kuenda kune yakasimba kana tembiricha yemhinduro yakwira kusvika padanho rakati. Patembiricha iyi, kufamba kwecheni dzemamorekuru dzeHPMC kuchave kwakaganhurirwa, zvichigadzira chimiro chenetwork chine mativi matatu, zvichikonzera chinhu chakafanana negel.
Kupisa kwegelation yeHPMC kunokanganiswa nezvinhu zvakawanda, chimwe chezvinhu zvakakosha ihuwandu hwehydroxypropyl. Kuwedzera kune huwandu hwehydroxypropyl, zvimwe zvinhu zvinokanganisa tembiricha yegel zvinosanganisira huremu hwemamorekuru, huwandu hwemhinduro, pH kukosha, mhando ye solvent, simba re ionic, nezvimwewo.
3. Mhedzisiro yehuwandu hwehydroxypropyl pakupisa kwejeli yeHPMC
3.1 Kuwedzera kwehuwandu hwehydroxypropyl kunotungamira mukuwedzera kwekupisa kwegel
Kupisa kweHPMC mu gelation kwakabatana zvakanyanya nehuwandu hwekutsiva hydroxypropyl mumorekuru wayo. Sezvo huwandu hwehydroxypropyl huchiwedzera, huwandu hwezvinhu zvinotsiva hydrophilic pa HPMC molecular chain hunowedzera, zvichikonzera kuwedzera kwekudyidzana pakati pemorekuru nemvura. Kubatana uku kunoita kuti mamorekuru atambanuke zvakanyanya, nokudaro zvichideredza simba rekudyidzana pakati pemamorekuru. Mukati meimwe nzvimbo yekuwanda, kuwedzera huwandu hwehydroxypropyl kunobatsira kuwedzera mwero we hydration uye kukurudzira kurongeka kwemamorekuru, kuitira kuti network structure igone kuumbwa patembiricha yakakwira. Nokudaro, tembiricha yegelation inowanzo kuwedzera ne hydroxypropyl ichikwira nekuwedzera kwehuwandu.
HPMC ine huwandu hwakawanda hwehydroxypropyl (senge HPMC K15M) inowanzo kuratidza tembiricha yakakwira yegelation pamwero wakafanana neAnxinCel®HPMC ine huwandu hwakaderera hwehydroxypropyl (senge HPMC K4M). Izvi zvinodaro nekuti huwandu hwakawanda hwehydroxypropyl hunoita kuti zviomere mamorekuru kudyidzana uye kuumba network patembiricha yakaderera, zvichida tembiricha yakakwira kuti ikunde hydration iyi uye kukurudzira intermolecular interactions kuti igadzire network structure ine mativi matatu.
3.2 Hukama huripo pakati pehuwandu hwehydroxypropyl nehuwandu hwemvura muropa
Kuwanda kwemvura mu solution chinhu chakakoshawo chinokanganisa tembiricha ye HPMC mu gelation. Mu HPMC solutions dzine concentration yakawanda, intermolecular interactions dzakasimba, saka gelation tembiricha inogona kunge yakakwira kunyangwe hydroxypropyl content yakaderera. Pa low concentrations, kudyidzana pakati pe HPMC molecules hakuna kusimba, uye solution inogona kunge yakanyorova pa tembiricha yakaderera.
Kana huwandu hwehydroxypropyl hukawedzera, kunyangwe hydrophilicity ichiwedzera, tembiricha yakakwira ichiri kudiwa kuti pagadzirwe gel. Kunyanya kana paine mamiriro ekusagadzikana kwakaderera, tembiricha yegelation inowedzera zvakanyanya. Izvi zvinodaro nekuti HPMC ine huwandu hwakawanda hwehydroxypropyl inonetsa kukurudzira kusangana pakati pemaketani emamorekuru kuburikidza nekuchinja kwetembiricha, uye maitiro egelation anoda simba rekuwedzera rekupisa kuti akunde hydration effect.
3.3 Mhedzisiro yehuwandu hwehydroxypropyl pakugadzirwa kwegelation
Mukati mehuwandu hwakati hwehydroxypropyl, maitiro ekugadzira gelation anotongwa nekudyidzana pakati pehydration nema molecular chains. Kana huwandu hwehydroxypropyl muHPMC molecule hwakaderera, hydration inoshaya simba, kudyidzana pakati pemamorekuru kwakasimba, uye tembiricha yakaderera inogona kukurudzira kuumbwa kwegel. Kana huwandu hwehydroxypropyl hwakakwira, hydration inowedzerwa zvakanyanya, kudyidzana pakati pemamorekuru kunoderera, uye tembiricha yegelation inowedzera.
Kuwedzera kwehuwandu hwehydroxypropyl kunogonawo kukonzera kuwedzera kwekusimba kweHPMC solution, shanduko iyo dzimwe nguva inowedzera tembiricha yekutanga kwegelation.
Kuwanda kwehydroxypropyl kune simba guru pakupisa kwe gelation yeHPMC. Sezvo huwandu hwehydroxypropyl huchiwedzera, hydrophilicity yeHPMC inowedzera uye kudyidzana pakati pemaketani emamorekuru kunoderera, saka tembiricha yayo yegelation inowanzo kuwedzera. Chiitiko ichi chinogona kutsanangurwa nekubatana kuri pakati pehydration nemaketani emamorekuru. Nekugadzirisa huwandu hwehydroxypropyl yeHPMC, kudzora kwakanyatsojeka kwegelation tembiricha kunogona kuwanikwa, nokudaro zvichiita kuti HPMC ishande zvakanaka mumishonga, chikafu nezvimwe zvinoshandiswa mumaindasitiri.
Nguva yekutumira: Ndira-04-2025