Hydroxypropyl methylcellulose (HPMC) is a non-ionic mvura-soluble polymer compound inowanikwa nekugadziriswa kwemakemikari echisikigo cellulose. Inoshandiswa zvakanyanya mukudya, mishonga, cosmetics uye maindasitiri ekuvaka, kunyanya seanonamira, thickener, emulsifier uye inomisa mumiriri mukugadzirira kwemishonga. Mukuita kwekushandisa, iyo viscosity maitiro eHPMC aqueous mhinduro yakakosha pakuita kwayo munzvimbo dzakasiyana.
1. Chimiro uye maitiro ehydroxypropyl methylcellulose
Iyo molecular chimiro cheHPMC ine maviri anotsiva mapoka, hydroxypropyl (-CH₂CHOHCH₃) uye methyl (-OCH₃), izvo zvinoita kuti ive yakanaka kunyungudika kwemvura uye kugona kugadzirisa. Iyo HPMC molecular cheni ine imwe yakaomesesa chimiro, asi inogona zvakare kugadzira matatu-dimensional network chimiro mune aqueous mhinduro, zvichikonzera kuwedzera kwe viscosity. Huremu hwayo hwemamorekuru, rudzi rwekutsiva uye dhigirii rekutsiva (kureva, dhigirii rehydroxypropyl uye methyl substitution yechikamu chimwe nechimwe) zvine pesvedzero yakakosha pane viscosity yemhinduro.
2. Viscosity maitiro emushonga wemvura
Iwo viscosity maitiro eHPMC aqueous solution ane hukama zvakanyanya nezvinhu zvakaita sekumisikidzwa, molecular uremu, tembiricha uye pH kukosha kweiyo solvent. Kazhinji, viscosity yeHPMC aqueous solution inowedzera nekuwedzera kwekusangana kwayo. Viscosity yaro inoratidza maitiro asiri eNewtonian rheological, ndiko kuti, sezvo shear rate inowedzera, viscosity yemushonga inoderera zvishoma nezvishoma, zvichiratidza chiitiko chekugera.
(1) Mhedzisiro yekuisa pfungwa pachinhu chimwe
Pane humwe hukama pakati pe viscosity yeHPMC aqueous solution uye kusungirirwa kwayo. Sezvo huwandu hweHPMC huchiwedzera, kupindirana kwema molecular mumushonga wemvura kunowedzerwa, uye kusungirirwa uye kuyambuka-kusangana kwemaketani emaketani kunowedzera, zvichiita kuti kuwedzera kwe viscosity yemhinduro. Pakudzika kwakadzika, iyo viscosity yeHPMC aqueous solution inowedzera mutsara nekuwedzera kwekusungwa, asi pakukwirira kwepamusoro, iyo viscosity kukura kwemhinduro kunowanzoita kutete uye inosvika kukosha kwakagadzikana.
(2) Mhedzisiro yeuremu hwemamorekuru
Iyo molecular huremu hweHPMC inokanganisa zvakananga viscosity yemhinduro yayo ine aqueous. HPMC ine huremu hwepamusoro-soro ine cheni dzakareba uye inogona kuumba yakanyanya kuomarara matatu-dimensional network mugadziriso weaqueous, zvichikonzera kukwirisa viscosity. Kusiyana neizvi, HPMC ine yakaderera molecular huremu ine looser network chimiro uye yakaderera viscosity nekuda kwayo ipfupi molecular cheni. Naizvozvo, kana uchinyorera, zvakakosha kwazvo kusarudza HPMC ine yakakodzera molecular uremu kuti uwane yakanakira viscosity maitiro.
(3) Mhedzisiro yekushisa
Tembiricha chinhu chakakosha chinokanganisa viscosity yeHPMC aqueous solution. Sezvo kutonhora kunowedzera, kufamba kwemamorekuru emvura kunowedzera uye viscosity yemhinduro inowanzoderera. Izvi zvinodaro nekuti kana tembiricha yakwira, rusununguko rweHPMC molecular chain inowedzera uye kupindirana pakati pemamorekuru kunopera simba, nekudaro kudzikisa viscosity yemhinduro. Nekudaro, mhinduro yeHPMC kubva kumabhechi akasiyana kana mabhureki kune tembiricha inogonawo kusiyana, saka tembiricha mamiriro ekunze anofanirwa kugadziridzwa zvinoenderana nezvinodiwa zvekushandisa.
(4) Mhedzisiro yepH kukosha
HPMC pachayo ndeye isiri-ionic komboni, uye viscosity yeaqueous mhinduro yayo inonzwa kune shanduko mupH. Kunyangwe HPMC ichiratidza kugadzikana kwe viscosity hunhu munzvimbo dzine acidic kana dzisina kwayakarerekera, kunyungudika uye viscosity yeHPMC inokanganisika munzvimbo dzine acidic zvakanyanya kana alkaline. Semuenzaniso, pasi peasidhi yakasimba kana yakasimba alkaline mamiriro, iyo HPMC mamorekuru anogona kuderedzwa zvishoma, nekudaro kuderedza viscosity yemushonga wayo wemvura.
3. Rheological analysis ye viscosity maitiro eHPMC aqueous solution
Iyo rheological maitiro eHPMC aqueous solution inowanzoratidza isiri-Newtonian fluid hunhu, izvo zvinoreva kuti viscosity yayo haina hukama chete nezvinhu zvakaita seyekugadzirisa kugadzirisa uye huremu hwemamorekuru, asiwo kushear rate. Kazhinji kutaura, pakaderera shear mitengo, HPMC aqueous solution inoratidza yakakwira viscosity, nepo kuwedzera kweshear rate, viscosity inoderera. Maitiro aya anodaidzwa kunzi "kuveura kuonda" kana kuti "kuveura kutetepa" uye kwakakosha mukushandisa kwakawanda. Semuenzaniso, muminda yekupfekedza, kugadzirira kwemishonga, kugadzira chikafu, nezvimwewo, iyo shear kuonda maitiro eHPMC inogona kuve nechokwadi chekuti viscosity yakakwira inochengetedzwa panguva yakaderera-yekumhanyisa maapplication, uye inogona kuyerera zviri nyore pasi pekumhanya kweshear mamiriro.
4. Zvimwe zvinhu zvinokanganisa viscosity yeHPMC aqueous solution
(1) Mhedzisiro yemunyu
Kuwedzerwa kwemunyu solutes (senge sodium chloride) kunogona kuwedzera viscosity yeHPMC aqueous solution. Izvi zvinodaro nekuti munyu unogona kukwidziridza kudyidzana pakati pemamorekuru nekushandura iyo ionic simba remhinduro, kuitira kuti mamorekuru eHPMC aumbe yakawedzera compact network chimiro, nekudaro ichiwedzera viscosity. Nekudaro, mhedzisiro yemhando yemunyu uye kutarisisa pane viscosity inodawo kugadziridzwa zvinoenderana nemamiriro chaiwo.
(2) Mhedzisiro yezvimwe zvinowedzera
Kuwedzera zvimwe zvinowedzera (zvakadai sema surfactants, mapolima, nezvimwewo) kuHPMC aqueous solution kuchakanganisawo viscosity. Semuenzaniso, ma surfactants anogona kuderedza viscosity yeHPMC, kunyanya kana iyo surfactant concentration yakakwira. Uye zvakare, mamwe mapolymer kana zvimedu zvinogona zvakare kudyidzana neHPMC uye kuchinja rheological zvimiro zvemhinduro yayo.
Iyo viscosity maitiro ehydroxypropyl methylcellulose aqueous solution inobatwa nezvinhu zvakawanda, zvinosanganisira concentration, molecular weight, tembiricha, pH value, etc. HPMC aqueous solution inowanzoratidza zvisiri zveNewtonian rheological properties, ine good thickening uye shear thinning properties, uye inoshandiswa zvakanyanya muminda yakasiyana-siyana yeindasitiri nemishonga. Kunzwisisa uye kugona izvi viscosity maitiro kuchabatsira kukwiridzira kushandiswa kweHPMC mumashandisirwo akasiyana. Mumashandisirwo anoshanda, iyo yakakodzera HPMC mhando uye maitiro ekugadzirisa anofanirwa kusarudzwa zvinoenderana nezvinodiwa chaizvo kuti uwane yakanaka viscosity uye rheological zvivakwa.
Nguva yekutumira: Mar-01-2025