Hydroxypropyl methylcellulose (HPMC) is a non-ionic, water-soluble cellulose yakasanganiswa ether.Chitarisiko chichena kusvika kuhupfu hweyero zvishoma kana granular material, isinganakidze, isinganhuhwi, isina chepfu, yakagadzikana mumakemikari, uye inonyunguduka mumvura kuti iite mhinduro yakatsetseka, yakajeka uye ine viscous.Chimwe chezvinhu zvakakosha zvehydroxypropyl methylcellulose mukushandisa ndechekuti inowedzera viscosity yemvura.Iko kukora mhedzisiro kunoenderana nehuwandu hwepolymerization (DP) yechigadzirwa, kuwanda kwe cellulose ether mumushonga wemvura, shear rate, uye tembiricha yemhinduro.Uye zvimwe zvinhu.
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Fluid mhando yeHPMC aqueous solution
Kazhinji, kushushikana kwemvura mukuyerera kweshear kunogona kuratidzwa sekushanda kweshear rate ƒ(γ), chero bedzi isiri nguva-inotsamira.Zvichienderana nechimiro cheƒ(γ), zvinwiwa zvinogona kukamurwa kuita mhando dzakasiyana, dzinoti: Newtonian fluid, dilatant fluid, pseudoplastic fluids uye Bingham plastic fluids.
Cellulose ethers yakakamurwa kuita mapoka maviri: imwe isiri-ionic cellulose ether uye imwe ionic cellulose ether.Kune rheology yemhando mbiri idzi dze cellulose ethers.SC Naik et al.yakaita chidzidzo chakakwana uye chakarongeka chekuenzanisa pahydroxyethyl cellulose uye sodium carboxymethyl cellulose mhinduro.Zvigumisiro zvakaratidza kuti zvose zvisiri-ionic cellulose ether solutions uye ionic cellulose ether mhinduro dzaive pseudoplastic.Kuyerera, kureva kuyerera kusiri kweNewtonian, kunosvika kune zvinwiwa zveNewtonian chete pamwero wakaderera.Iyo pseudoplasticity yehydroxypropyl methylcellulose mhinduro inoita basa rakakosha mukushandisa.Semuenzaniso, kana yakashandiswa mumachira, nekuda kwekuveura kutetepa maitiro ezvigadziriso zvine aqueous, viscosity yemushonga inodzikira nekuwedzera kweshear rate, izvo zvinoita kuti yunifomu yekupararira kwepigment particles, uye zvakare inowedzera fluidity yekupfeka. .Mhedzisiro yacho yakakura kwazvo;panguva yekuzorora, viscosity yemhinduro yakakura, iyo inodzivirira zvinodzivirira kuiswa kwe pigment particles mujasi.
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HPMC Viscosity Test Method
Chiratidzo chakakosha chekuyera kukora kwehydroxypropyl methylcellulose ndiyo inooneka viscosity yemushonga wemvura.Nzira dzekuyera dzezvinooneka viscosity dzinowanzobatanidza capillary viscosity nzira, rotational viscosity nzira uye inodonha bhora viscosity nzira.
kupi: ndiyo inooneka viscosity, mPa s;K ndiyo viscometer inogara iripo;d ndiyo density yemhinduro yemuenzaniso pa20/20 ° C;t inguva yekuti mhinduro ipfuure nepamusoro peiyo viscometer kusvika kune yakadzika mamaki, s;Iyo nguva iyo mafuta akajairika anoyerera kuburikidza ne viscometer inoyerwa.
Nekudaro, iyo nzira yekuyera necapillary viscometer inonyanya kunetsa.Iyo viscosities yezhinji cellulose ether yakaoma kuongorora uchishandisa capillary viscometer nekuti mhinduro idzi dzine trace uwandu hwezvinhu zvisinganyungudika zvinongoonekwa kana capillary viscometer yakavharwa.Naizvozvo, vagadziri vazhinji vanoshandisa rotational viscometers kudzora kunaka kwehydroxypropyl methylcellulose.Brookfield viscometers inowanzoshandiswa kune dzimwe nyika, uye NDJ viscometers inoshandiswa muChina.
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Kufurira zvinhu zveHPMC viscosity
3.1 Hukama nedhigirii rekuunganidza
Kana mamwe maparameter akasara asina kuchinjwa, viscosity yehydroxypropyl methylcellulose solution inoenzana nedhigirii repolymerization (DP) kana huremu hwemamorekuru kana kureba kweketani, uye inowedzera nekuwedzera kwechiyero chepolymerization.Mhedzisiro iyi inonyanya kutaurwa mune yakaderera dhigirii yepolymerization pane iyo yakakwira degree repolymerization.
3.2 Hukama pakati peviscosity uye yekuisa pfungwa
Iyo viscosity yehydroxypropyl methylcellulose inowedzera nekuwedzera kwekusangana kwechigadzirwa mumhinduro ine mvura.Kunyange kuchinja kuduku kunokonzera kuchinja kukuru mu viscosity.Nezita rezita re viscosity ye hydroxypropyl methylcellulose Mhedzisiro yekuchinja kwekugadzirisa kugadzirisa pane viscosity yemhinduro inowedzera uye inooneka.
3.3 Hukama pakati pe viscosity uye shear rate
Hydroxypropyl methylcellulose aqueous solution ine midziyo yekuveura kutetepa.Hydroxypropyl methylcellulose yeakasiyana zita viscosity inogadzirirwa kuita 2% aqueous solution, uye viscosity yayo pamhando dzakasiyana dzekugera inoyerwa zvichiteerana.Zvigumisiro ndezvinotevera Sezvakaratidzwa mumufananidzo.Pane yakaderera shear rate, viscosity yehydroxypropyl methylcellulose mhinduro haina kuchinja zvakanyanya.Nekuwedzera kweshear rate, iyo viscosity yehydroxypropyl methylcellulose mhinduro ine yakakwirira nominal viscosity yakaderera zviri pachena, nepo mhinduro ine yakaderera viscosity haina kuderera zviri pachena.
3.4 Hukama pakati pe viscosity uye tembiricha
Iyo viscosity yeiyo hydroxypropyl methylcellulose mhinduro inokanganisa zvakanyanya nekupisa.Sezvo kutonhora kunowedzera, viscosity yemhinduro inoderera.Sezvinoratidzwa mumufananidzo, inogadzirirwa kuva mhinduro ine aqueous ine mutsara we2%, uye kuchinja kweviscosity nekuwedzera kwekushisa kunoyerwa.
3.5 Zvimwe zvinofurira
Iyo viscosity yeaqueous solution yehydroxypropyl methylcellulose inokanganiswawo nezvinowedzerwa mumhinduro, pH kukosha kwemhinduro, uye kuderera kwehutachiona.Kazhinji, kuti uwane zvirinani viscosity performance kana kuderedza mutengo wekushandisa, zvinodikanwa kuwedzera rheology modifiers, senge ivhu, yakagadziridzwa ivhu, polymer poda, starch ether uye aliphatic copolymer, kune aqueous solution yehydroxypropyl methylcellulose., uye electrolytes yakadai sekloridi, bromide, phosphate, nitrate, nezvimwewo zvinogonawo kuwedzerwa kune aqueous solution.Izvi zvinowedzera hazvizongokanganisa viscosity zvivakwa zveaqueous solution, asi zvinokanganisa zvimwe zvekushandisa zvehydroxypropyl methylcellulose sekuchengetedza mvura., sag resistance, etc.
Iyo viscosity yeaqueous solution ye hydroxypropyl methylcellulose inenge isina kukanganiswa neasidhi uye alkali, uye inowanzogadzikana muhuwandu hwe3 kusvika ku 11. Inogona kumira kune imwe nhamba yeasina simba acids, yakadai se formic acid, acetic acid, phosphoric acid. , boric asidhi, citric acid, etc. Zvisinei, concentrated acid ichaderedza viscosity.Asi caustic soda, potassium hydroxide, mvura yeraimu, nezvimwewo hazvina simba pairi.Kuenzaniswa nemamwe ma cellulose ethers, hydroxypropyl methylcellulose aqueous solution ine yakanaka antimicrobial kugadzikana, chikonzero chikuru ndechekuti hydroxypropyl methylcellulose ine hydrophobic mapoka ane huwandu hwakanyanya hwekutsiva uye steric chipingamupinyi chemapoka Zvisinei, sezvo kutsiva kusingawanzo kuve kwakafanana, iyo unsubstituted anhydroglucose unit. inonyungudika zviri nyore netwupukanana, zvichikonzera kushatiswa kwe cellulose ether mamorekuru uye cheni scission.Kuita kwacho ndechokuti kuoneka viscosity yemushonga wemvura inoderera.Kana zvakakosha kuchengetedza aqueous solution ye hydroxypropyl methylcellulose kwenguva yakareba, zvinokurudzirwa kuwedzera huwandu hwehutachiona hwehutachiona kuitira kuti viscosity irege kuchinja zvakanyanya.Paunosarudza anti-fungal agents, preservatives kana fungicides, unofanirwa kuchenjerera kuchengetedza, uye sarudza zvigadzirwa zvisina chepfu kumuviri wemunhu, zvine zvinhu zvakagadzikana uye zvisinganhuhwi, zvakadai seDOW Chem's AMICAL fungicides, CANGUARD64 preservatives, FUELSAVER bacteria agents. nezvimwe zvigadzirwa.inogona kuita basa rinoenderana.
Nguva yekutumira: Oct-20-2022