Hydroxypropyl methylcellulose (HPMC)i-ether yakasanganiswa ye cellulose isina ionic, inonyungudika mumvura. Chitarisiko chayo chakachena kusvika kune yero zvishoma kana zvinhu zvakapwanyika, haina kunaka, haina hwema, haina chepfu, inogara kwenguva refu, uye inonyungudika mumvura kuti igadzire mhinduro yakatsetseka, yakajeka uye ine viscous. Chimwe chezvinhu zvakakosha zvehydroxypropyl methylcellulose painoshandiswa ndechekuti inowedzera viscosity yemvura. Kukora kwayo kunoenderana nehuwandu hwepolymerization (DP) yechigadzirwa, huwandu hwe cellulose ether mumushonga wemvura, shear rate, uye tembiricha yemhinduro. Uye zvimwe zvinhu.
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Rudzi rwemvura rweHPMC remvura
Kazhinji, kushushikana kwemvura iri mukuyerera kwemvura kunogona kuratidzwa sekushanda kwehuwandu hwemvura inochekwa ƒ(γ), chero bedzi isingatsamiri panguva. Zvichienderana nechimiro che ƒ(γ), mvura inogona kukamurwa kuita mhando dzakasiyana, dzinoti: mvura yeNewtonian, mvura inochekwa, mvura yepseudoplastic uye mvura yeBingham plastic.
MaCellulose ethers akakamurwa kuita mapoka maviri: rimwe harisi ionic cellulose ether uye rimwe harisi ionic cellulose ether. Nezve rheology yemhando mbiri idzi dze cellulose ethers. SC Naik nevamwe vake vakaita ongororo yakakwana uye yakarongeka yekuenzanisa pamusoro pe hydroxyethyl cellulose uye sodium carboxymethyl cellulose solutions. Zvakabuda zvakaratidza kuti mhinduro dzese dziri non-ionic cellulose ether solutions uye mhinduro dze ionic cellulose ether dzaive pseudoplastic. Kuyerera, kureva kuti kuyerera kusiri kweNewtonian, kunosvika kuNewtonian liquids chete pahuwandu hwakaderera. Pseudoplasticity ye hydroxypropyl methylcellulose solution inoita basa rakakosha mukushandiswa. Semuenzaniso, kana ikashandiswa mu coatings, nekuda kwe shear thinning hunhu hwe aqueous solutions, viscosity ye solution inoderera nekuwedzera kwe shear rate, izvo zvinoita kuti pigment particles ipararire zvakaenzana, uye zvinowedzerawo fluidity ye coatings. Mhedzisiro yacho yakakura kwazvo; nepo yakazorora, viscosity ye solution yakakura, izvo zvinodzivirira kuiswa kwe pigment particles mu coatings.
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Nzira yekuedza HPMC Viscosity
Chiratidzo chakakosha chekuyera kukora kwehydroxypropyl methylcellulose ndiko kusimba kwemvura. Nzira dzekuyera kusimba kwemvura dzinowanzo sanganisira nzira ye capillary viscosity, nzira ye rotational viscosity uye nzira ye falling ball viscosity.
apo: ndiyo viscosity inoonekwa, mPa s; K ndiyo viscometer constant; d ndiyo density ye solution sample pa 20/20°C; t ndiyo nguva yekuti solution ipfuure nepachikamu chepamusoro che viscometer kusvika pasi, s; Nguva iyo standard oil inoyerera nepa viscometer inoyerwa.
Zvisinei, nzira yekuyera ne capillary viscometer inonyanya kunetsa. Kupenya kwevakawandaethers dze celluloseZvakaoma kuongorora uchishandisa capillary viscometer nekuti mhinduro idzi dzine zvisaririra zvezvinhu zvisinganyunguduke zvinongoonekwa chete kana capillary viscometer yavharwa. Nokudaro, vagadziri vazhinji vanoshandisa rotational viscometers kudzora mhando yehydroxypropyl methylcellulose. Brookfield viscometers dzinowanzoshandiswa munyika dzekunze, uye NDJ viscometers dzinoshandiswa muChina.
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Zvinhu zvinopesvedzera HPMC viscosity
3.1 Hukama nehukuru hwekuunganidzwa
Kana mamwe ma parameter akaramba asina kuchinja, viscosity ye hydroxypropyl methylcellulose solution inoenderana ne degree ye polymerization (DP) kana molecular weight kana molecular chain length, uye inowedzera nekuwedzera kwe degree ye polymerization. Mhedzisiro iyi inonyanya kuoneka kana paine low degree ye polymerization pane kana paine high degree ye polymerization.
3.2 Hukama huripo pakati pekusimba uye kusimba
Kuwanda kwehydroxypropyl methylcellulose kunowedzera nekuwedzera kwehuwandu hwechigadzirwa mumushonga wemvura. Kunyangwe kuchinja kudiki kwehuwandu kunokonzera shanduko huru muhunhu. Nekuwanda kwehuwandu hwehydroxypropyl methylcellulose Mhedzisiro yekuchinja kwehuwandu hwemushonga pahunhu hwemushonga iri pachena.
3.3 Hukama huripo pakati pekutsvuka uye mwero wekuchekwa kwebvudzi
Mhinduro yemvura yeHydroxypropyl methylcellulose ine hunhu hwekutetepa kwesimbi. Hydroxypropyl methylcellulose yemhando dzakasiyana dze viscosity inogadzirwa kuita 2% yemvura, uye viscosity yayo pamhando dzakasiyana dze shear inoyerwa zvakateerana. Mhedzisiro yacho ndeiyi inotevera Sezvakaratidzwa mumufananidzo. Pakuchekwa kwesimbi kwakaderera, viscosity ye hydroxypropyl methylcellulose solution haina kuchinja zvakanyanya. Nekuwedzera kwe shear rate, viscosity ye hydroxypropyl methylcellulose solution ine viscosity yakakwira yemhando yepamusoro yakaderera zviri pachena, nepo mhinduro ine viscosity yakaderera isina kudzikira zviri pachena.
3.4 Hukama huripo pakati pekusimba uye tembiricha
Kuwanda kwemvura mu hydroxypropyl methylcellulose solution kunokanganiswa zvikuru nekupisa. Sezvo tembiricha ichiwedzera, kuwanda kwemvura mu solution kunoderera. Sezvakaratidzwa mumufananidzo, inogadzirwa mumvura ine huwandu hwe2%, uye kuchinja kwekuwanda kwemvura nekuwedzera kwekupisa kunoyerwa.
3.5 Zvimwe zvinhu zvinopesvedzera
Kuwanda kwemvura inobuda mu hydroxypropyl methylcellulose kunokanganiswawo nezvinowedzera mu solution, pH kukosha kwe solution, uye kuora kwe microbial. Kazhinji, kuti uwane kushanda kuri nani kwe viscosity kana kuderedza mutengo wekushandisa, zvinodikanwa kuwedzera rheology modifiers, senge ivhu, modified clay, polymer powder, starch ether uye aliphatic copolymer, kune aqueous solution ye hydroxypropyl methylcellulose. , uye ma electrolytes akadai se chloride, bromide, phosphate, nitrate, nezvimwewo zvinogonawo kuwedzerwa kune aqueous solution. Izvi zvinowedzera hazvingokanganisi chete viscosity properties ye aqueous solution, asiwo zvinokanganisa zvimwe zvinoshandiswa zve hydroxypropyl methylcellulose zvakaita sekuchengetedza mvura. , sag resistance, nezvimwewo.
Kusviba kwemvura yehydroxypropyl methylcellulose hakukanganisike neacid nealkali, uye kazhinji kunogara kwakagadzikana pakati pe3 kusvika 11. Inogona kutsungirira huwandu hwakati hwemaacid asina simba, akadai seformic acid, acetic acid, phosphoric acid, boric acid, citric acid, nezvimwewo. Zvisinei, concentrated acid inoderedza kusviba. Asi caustic soda, potassium hydroxide, lime water, nezvimwewo hazvina zvazvinobatsira pairi. Zvichienzaniswa nedzimwe cellulose ethers,hydroxypropyl methylcelluloseMhinduro yemvura ine kugadzikana kwakanaka kwemishonga inorwisa mabhakitiriya, chikonzero chikuru ndechekuti hydroxypropyl methylcellulose ine mapoka anorwisa hydrophobic ane mwero wepamusoro wekutsiva uye steric constriction yemapoka. Zvisinei, sezvo mhinduro yekutsiva kazhinji isingawanzo kufanana, anhydroglucose unit isina kutsiva inoparadzwa nyore nyore netupukanana, zvichikonzera kuora kwemamorekuru e-cellulose ether uye chain scission. Kushanda ndekwekuti viscosity inooneka yemhinduro yemvura inoderera. Kana zvichidikanwa kuchengetedza mhinduro yemvura yehydroxypropyl methylcellulose kwenguva yakareba, zvinokurudzirwa kuwedzera huwandu hweantifungal agent kuitira kuti viscosity isachinje zvakanyanya. Pakusarudza mishonga inorwisa fungal, mishonga inochengetedza kana fungicides, unofanirwa kutarisisa kuchengetedzeka, uye kusarudza zvigadzirwa zvisina chepfu kumuviri wemunhu, zvine hunhu hwakagadzikana uye zvisina hwema, senge DOW Chem's AMICAL fungicides, mishonga inochengetedza CANGUARD64, mishonga inorwisa mabhakitiriya yeFUELSAVER nezvimwe zvigadzirwa. zvinogona kuita basa rinoenderana.
Nguva yekutumira: Kubvumbi-28-2024