Kukora mhedzisiro yehydroxypropyl methylcellulose

Hydroxypropyl methylcelluloseHPMCinoisa dhaka rakanyorova rine yakanakisa viscosity, iyo inogona kuwedzera zvakanyanya kunamatira pakati pevhu rakanyorova uye base layer, uye kugadzirisa iyo anti-sagging kuita kwedhaka.mudhaka.Iko kukora mhedzisiro ye cellulose ether inogona zvakare kuwedzera homogeneity uye anti-kupararira kugona kwezvinhu zvitsva-samende, kudzivirira delamination, kupatsanurwa uye kubuda ropa kwedhaka nekongiri, uye inogona kushandiswa mufiber-inosimbisa kongiri, pasi pemvura kongiri uye kuzvigadzirisa. kongiri .

Hydroxypropyl methylcellulose inowedzera viscosity yesimende-yakavakirwa zvinhu kubva kune viscosity ye cellulose ether mhinduro.Iyo viscosity ye cellulose ether mhinduro inowanzoongororwa neiyo index "viscosity".The viscosity ye cellulose ether kazhinji inoreva imwe concentration (yakadai se2%) ye cellulose ether solution pane imwe tembiricha (yakadai se20°C) uye kugera Ukoshi hweviscosity hunoyerwa nechidziyo chekuyeresa chakatsanangurwa (sekutenderera viscometer) pasi pemamiriro ekumhanya (kana chiyero chekutenderera, senge 20 rpm).

Viscosity inokosha parameter yekuongorora kushanda kwe cellulose ether.Iyo yakakwirira viscosity yehydroxypropyl methylcellulose mhinduro, zviri nani kutaridzika kwesimende-based material, zviri nani kunamira kune substrate, zviri nani anti-sagging uye anti-kuparadzira kugona.Yakasimba, asi kana viscosity yayo yakakurisa, inokanganisa kuyerera uye kushanda kwesimende-yakavakirwa zvinhu (sekunamatira mapanga ekupurasita panguva yekupurasa dhaka rekuvaka).Nokudaro, viscosity ye cellulose ether inoshandiswa mudhaka yakaoma-yakasanganiswa inowanzoita 15,000 ~ 60,000 mPa.S-1, dhaka rinozvimisikidza uye kongiri inozvigadzira inoda kunyungudika kunoda yakaderera viscosity ye cellulose ether.

Pamusoro pezvo, iko kukora mhedzisiro yehydroxypropyl methylcellulose inowedzera kudiwa kwemvura yesimende-yakavakirwa zvinhu, nekudaro ichiwedzera goho redhaka.

Iyo viscosity yehydroxypropyl methylcellulose mhinduro inoenderana nezvinhu zvinotevera:

Cellulose ether molecular huremu (kana dhigirii repolymerization) uye kufungisisa, tembiricha yemhinduro, shear rate, uye nzira dzekuyedza.

1. Iyo yakakwirira dhigirii yepolymerization ye cellulose ether, yakakura iyo molecular uremu, uye yakakwirira viscosity yemushonga wayo une aqueous;

2. Iyo yakakwira dosage (kana kusungirirwa) ye cellulose ether, iyo inokwirisa viscosity yeaqueous solution yayo, asi kutarisisa kunofanirwa kubhadharwa pakusarudza muyero wakakodzera paunenge uchiishandisa, kuitira kuti udzivise dosi yakawandisa uye kukanganisa kushanda kwedhaka. uye kongiri;

3. Kufanana nezvinwiwa zvakawanda, viscosity ye cellulose ether solution inodzikira nekuwedzera kwetembiricha, uye iyo yakanyanya kuwanda kwe cellulose ether, iyo yakanyanya mhedzisiro yekushisa;

4. Cellulose ether solutions inowanzova pseudoplastics ine shear thinning properties.Iyo yakakwirira iyo shear rate panguva yekuedzwa, iyo yakaderera iyo viscosity.

Nokudaro, kubatana kwedhaka kuchaderedzwa nekuda kwekuita kwesimba rekunze, iro rinobatsira pakutsvaira kuvakwa kwedhaka, kuitira kuti dhaka rive nekushanda kwakanaka uye kubatana panguva imwe chete.Zvisinei, kana kusanganiswa kwe cellulose ether solution kwakaderera zvikuru uye viscosity iduku zvikuru, icharatidza maitiro eNewtonian fluid.Kana iyo yekuisa pfungwa ichiwedzera, mhinduro inozoratidza zvishoma nezvishoma maitiro epseudoplastic fluid, uye iyo yakakwira yekumisikidza, iyo inonyanya kujeka iyo pseudoplasticity.