Hydroxypropyl methylcellulose inoisa dhaka rakanyorova rine yakanakisa viscosity, iyo inogona kuwedzera zvakanyanya kugona kwekubatana pakati pevhu rakanyorova uye base layer, uye kugadzirisa iyo anti-sag kuita kwedhaka. Inoshandiswa zvakanyanya mukupura dhaka, kunze kwemadziro ekudzivirira system uye zvidhinha kusungirirwa mudhaka. Iko kukora mhedzisiro ye cellulose ether inogona zvakare kuwedzera homogeneity uye anti-kupararira kugona kwezvichangobva kusanganiswa simende-based zvinhu, kudzivirira delamination, kupatsanura uye kubuda ropa kwedhaka nekongiri, uye inogona kushandiswa mufiber kongiri, pasi pemvura kongiri uye yekuzvigadzirisa kongiri. .
Hydroxypropyl methylcelluloseHPMCinowedzera viscosity yesimende-yakavakirwa zvinhu kubva kune viscosity ye cellulose ether mhinduro. Indekisi ye "viscosity" inowanzoshandiswa kuongorora viscosity ye cellulose ether solution. Iyo viscosity ye cellulose ether kazhinji inoreva iyo cellulose ether mhinduro ine imwe concentration (senge 2%). Kumhanya (kana chiyero chekutenderera, senge 20 rpm), iyo viscosity kukosha yakayerwa neyakatarwa yekuyeresa chiridzwa (senge inotenderera viscometer).
Viscosity inokosha parameter yekuongorora kushanda kwe cellulose ether. Iyo yakakwira viscosity yehydroxypropyl methylcellulose mhinduro, zviri nani kutaridzika kwesimende-based zvinhu, zviri nani kunamira kune substrate, uye zvirinani anti-sagging uye anti-kupararira masimba. Yakasimba, asi kana viscosity yayo yakakurisa, inokanganisa kuyerera uye kushanda kwesimende-yakavakirwa zvinhu (sekunamatira banga rekupurasita panguva yekupura dhaka rekuvaka). Nokudaro, viscosity ye cellulose ether inoshandiswa mudhaka yakaoma-yakasanganiswa inowanzoita 15,000 ~ 60,000 mPa. S-1, dhaka rinozvimisa-leveling uye self-compacting kongiri, izvo zvinoda kunyungudika kwemvura, zvinoda yakaderera viscosity ye cellulose ether.
Uye zvakare, iyo thickening mhedzisiro yehydroxypropyl methylcellulose inowedzera kudiwa kwemvura yesimende-yakavakirwa zvinhu, nekudaro ichiwedzera goho redhaka.
Iyo viscosity yehydroxypropyl methylcellulose mhinduro zvinoenderana nezvinotevera zvinhu:
Molecular huremu (kana dhigirii repolymerization) uye kusangana kweselulosi ether, tembiricha yemhinduro, shear rate uye nzira yekuyedza.
1. Iyo yakakwirira dhigirii yepolymerization ye cellulose ether uye yakakura iyo molecular uremu, iyo yakakwirira viscosity yemushonga wayo une aqueous;
2. Iyo yakakwirira yepimo (kana kusungirirwa) ye cellulose ether, iyo yakakwirira viscosity yeaqueous solution yayo, asi kutarisirwa kunofanira kutorwa kusarudza muyero wakakodzera paunenge uchiishandisa, kuitira kuti usakanganisa kushanda kwedhaka nekongiri kana dosage yakawandisa;
3. Sezvinoita zvinwiwa zvakawanda, viscosity ye cellulose ether solution inodzikira nekuwedzera kwetembiricha, uye iyo yakanyanya kuwanda kwe cellulose ether, kunowedzera simba rekushisa;
4. Cellulose ether solution inowanzova pseudoplastic, iyo ine pfuma yeshear thinning. Iyo yakakura iyo shear rate panguva yekuedzwa, iyo yakaderera iyo viscosity.
Nokudaro, kubatanidzwa kwedhaka kuchaderedzwa nekuda kwesimba rekunze, iro rinobatsira pakuchera kuvaka kwedhaka, kuitira kuti dhaka rive nekushanda kwakanaka uye kubatana panguva imwe chete. Nekudaro, iyo cellulose ether mhinduro icharatidza Newtonian fluid maitiro apo iyo yekumisikidza yakadzikira uye viscosity idiki. Kana iyo yekuisa pfungwa ichiwedzera, mhinduro yacho inozoratidza zvishoma nezvishoma pseudoplastic fluid maitiro, uye iyo yakakwira iyo yekumisikidza, iyo inonyanya kuoneka iyo pseudoplasticity.
Nguva yekutumira: Zvita-20-2022