Hydroxypropyl Methylcellulose (HPMC)uyeMethylcellulose (MC)ndiwo maviri akajairika cellulose derivatives, ane mimwe misiyano yakakosha muchimiro chemakemikari, zvivakwa uye mashandisirwo. Kunyangwe zvimiro zvavo zvemamorekuru zvakafanana, ese ari maviri anowanikwa neakasiyana makemikari shanduko ne cellulose seyakakosha skeleton, asi zvimiro zvavo uye mashandisiro akasiyana.
1. Kusiyana mukugadzirwa kwemakemikari
Methylcellulose (MC): Methylcellulose inowanikwa nekuunza methyl (-CH₃) mapoka muma cellulose mamorekuru. Chimiro chayo ndechekuunza methyl mapoka mumapoka ehydroxyl (-OH) emamorekuru e cellulose, kazhinji achitsiva rimwe kana anopfuura mapoka ehydroxyl. Ichi chimiro chinoita kuti MC ive nekumwe kunyungudika kwemvura uye viscosity, asi iyo chaiyo kuratidzwa kwekunyungudika uye zvivakwa zvinokanganiswa nedhigirii remethylation.
Hydroxypropyl Methylcellulose (HPMC): HPMC imwezve yakagadziridzwa chigadzirwa chemethylcellulose (MC). Pahwaro hweMC, HPMC inounza hydroxypropyl (-CH₂CH(OH)CH₃) mapoka. Iko kuiswa kwehydroxypropyl kunovandudza kunyungudika kwayo mumvura uye inovandudza kugadzikana kwayo kwekupisa, kujeka uye zvimwe zvinhu zvemuviri. HPMC ine ese ari maviri methyl (-CH₃) uye hydroxypropyl (-CH₂CH(OH)CH₃) mapoka mumakemikari ayo, saka inonyungudika mumvura kupfuura yakachena MC uye ine yakanyanya kugadzikana yekupisa.
2. Solubility uye hydration
Solubility yeMC: Methylcellulose ine kumwe kunyungudika mumvura, uye kunyungudika kunoenderana nedhigirii remethylation. Kazhinji, methylcellulose ine yakaderera solubility, kunyanya mumvura inotonhora, uye inowanzodikanwa kupisa mvura kuti ikurudzire kupera kwayo. Iyo yakanyungudutswa MC ine yakakwira viscosity, iriwo chinhu chakakosha mune akawanda maindasitiri maapplication.
Solubility yeHPMC: Mukupesana, HPMC ine nani kunyungudika kwemvura nekuda kwekuunzwa kwehydroxypropyl. Inogona kunyungudika nekukurumidza mumvura inotonhora, uye kunyungudika kwayo kunokurumidza kupfuura MC. Nekuda kwesimba rehydroxypropyl, iyo solubility yeHPMC haina kungovandudzwa mumvura inotonhora chete, asiwo kugadzikana kwayo uye kujeka mushure mekuparadzwa kunovandudzwa. Naizvozvo, HPMC inonyanya kukodzera kune zvikumbiro zvinoda kukurumidza kuparadzwa.
3. Kugadzikana kwekushisa
Thermal kugadzikana kweMC: Methylcellulose ine hurombo hwekudziya kugadzikana. Solubility yayo uye viscosity ichachinja zvakanyanya pakupisa kwakanyanya. Kana tembiricha yakakwira, kuita kweMC kunokanganiswa nyore nekuora kwekupisa, saka kushandiswa kwayo munzvimbo yekushisa kwakanyanya kunoenderana nezvimwe zvirambidzo.
Kugadzikana kwekupisa kweHPMC: Nekuda kwekuunzwa kwehydroxypropyl, HPMC ine kugadzikana kwemafuta kuri nani kupfuura MC. Kuita kweHPMC kwakagadzikana patembiricha yakakwira, saka inogona kuchengetedza mhedzisiro yakanaka mukupisa kwekushisa. Kugadzikana kwayo kwekushisa kunoita kuti ishandiswe zvakanyanya pasi pemamwe mamiriro ekupisa (sekudya uye kugadzira zvinodhaka).
4. Viscosity maitiro
Viscosity yeMC: Methyl cellulose ine viscosity yakakwirira mumushonga wemvura uye inowanzoshandiswa mumamiriro ezvinhu apo kukwirira kwepamusoro kunodiwa, zvakadai sema thickeners, emulsifiers, nezvimwewo. Chiyero chepamusoro chemethylation chichawedzera viscosity yemhinduro.
Viscosity yeHPMC: Iyo viscosity yeHPMC inowanzodzikira zvishoma pane iyo yeMC, asi nekuda kwekunyungudika kwayo kwemvura uye yakagadziridzwa kugadzikana kwekupisa, HPMC inonyanya kunaka kupfuura MC mune dzakawanda mamiriro apo zvirinani viscosity control inodiwa. Iyo viscosity yeHPMC inokanganiswa nehuremu hwemamorekuru, kugadzirisa kugadzirisa uye kupisa kwekushisa.
5. Misiyano mundima dzekushandisa
Kushandiswa kweMC: Methyl cellulose inoshandiswa zvakanyanya mukuvaka, machira, kugadzira chikafu, mushonga, zvizorwa uye mamwe minda. Kunyanya mundima yekuvaka, chinhu chakajairika chekuvaka chinowedzera chinoshandiswa kukora, kuvandudza kunamatira nekuvandudza kuita kwekuvaka. Muindasitiri yezvekudya, MC inogona kushandiswa seyakakora, emulsifier uye stabilizer, uye inowanzo wanikwa muzvigadzirwa zvakaita sejelly uye ice cream.
Kushandiswa kweHPMC: HPMC inoshandiswa zvakanyanya mumishonga, chikafu, kuvaka, zvizorwa uye mamwe maindasitiri nekuda kwekunyorovesa kwayo uye kugadzikana kwekupisa. Muchigadzirwa chemishonga, HPMC inowanzoshandiswa sechinhu chinokonzera zvinodhaka, kunyanya mukugadzirira kwemuromo, semufirimu wekare, thickener, kusimudzira-kusunungurwa mumiririri, etc. Muchikafu chekudya, HPMC inoshandiswa sechikafu uye emulsifier yezvokudya zvakaderera-calori, uye inoshandiswa zvakanyanya mumashizha e saladi, zvokudya zvechando uye zvimwe zvigadzirwa.
6. Kuenzanisa kwezvimwe zvinhu
Transparency: HPMC mhinduro dzinowanzo kuve nekujeka kwepamusoro, saka dzakanyanya kukodzera maapplication anoda kutaridzika kwakajeka kana kupenya. MC mhinduro dzinowanzoita turbid.
Biodegradability uye chengetedzo: Ose ane yakanaka biodegradability, anogona kushatiswa zvakasikwa nenharaunda pasi pemamwe mamiriro, uye anoonekwa akachengeteka mukushandisa kwakawanda.
HPMCuyeMCzvese zviri zviviri zvinhu zvakawanikwa nekugadziriswa kwe cellulose uye zvine maumbirwo akafanana, asi zvine misiyano yakakura mukunyungudika, kugadzikana kwemafuta, viscosity, pachena, uye nzvimbo dzekushandisa. HPMC ine kunyungudika kwemvura kuri nani, kugadzikana kwemafuta, uye kujeka, saka inonyanya kukodzera kune zviitiko zvinoda kuparara nekukurumidza, kugadzikana kwekupisa, uye kutaridzika. MC inoshandiswa zvakanyanya muzviitiko zvinoda yakakwira viscosity uye kugadzikana kwepamusoro nekuda kwepamusoro viscosity uye yakanaka thickening maitiro.
Nguva yekutumira: Kubvumbi-06-2025