The thickening effect yecellulose etherzvinoenderana ne: dhigirii repolymerization ye cellulose ether, kugadziriswa kwemhinduro, shear rate, tembiricha uye mamwe mamiriro. Iyo gelling midziyo yemushonga yakasarudzika kune alkyl cellulose uye yakagadziridzwa maderivatives. Iyo gelation zvivakwa zvine hukama neiyo dhigirii yekutsiva, kugadzirisa kugadzirisa uye zvinowedzera. Kune hydroxyalkyl yakagadziridzwa derivatives, iyo gel zvivakwa zvine hukamawo nedhigirii rekuchinja rehydroxyalkyl. Kune yakaderera viscosity MC uye HPMC, 10% -15% mhinduro inogona kugadzirirwa, yepakati viscosity MC uye HPMC inogona kugadzirirwa 5% -10% mhinduro, uye yakakwirira viscosity MC uye HPMC inogona chete kugadzirira 2% -3% mhinduro, uye kazhinji. iyo viscosity classification ye cellulose ether inoiswawo grade 1% -2% mhinduro.
High-molecular-weight cellulose ether ine high thickening kunyatsoita, uye mapolymer ane akasiyana mamolecular weights ane maviscosities akasiyana mune imwechete yeconcentration solution. Iyo inonangwa viscosity inogona kuwanikwa chete nekuwedzera yakawanda yakaderera molecular uremu cellulose ether. Viscosity yayo haina kutsamira pane shear rate, uye iyo yakakwira viscosity inosvika painotariswa viscosity, inoda kushoma kuwedzera, uye viscosity zvinoenderana nekukora kwekuita. Naizvozvo, kuti uwane kumwe kuenderana, imwe chiyero che cellulose ether (concentration yemhinduro) uye mhinduro viscosity inofanira kuvimbiswa. Iyo tembiricha yegel yemushonga zvakare inodzikira mutsetse nekuwedzera kwekusangana kwemhinduro, uye gels pane tembiricha yekamuri mushure mekusvika kumwe kusungwa. Iyo gelling concentration yeHPMC yakakwira zvakanyanya pakamuri tembiricha.
Consistency inogonawo kugadziriswa nekusarudza particle size uye kusarudza cellulose ethers ane madhigirii akasiyana ekugadzirisa. Iyo inonzi shanduko ndeye kuunza imwe dhigirii yekutsiva yemapoka ehydroxyalkyl pane skeleton chimiro cheMC. Nekushandura hukama hwekutsinhanisa hunhu hwezviviri zvinotsiva, kureva, iyo DS neMS inotsinhanisa tsika dzemapoka emethoxy nehydroxyalkyl atinowanzo kutaura. Zvido zvakasiyana-siyana zvekushanda zve cellulose ether zvinogona kuwanikwa kuburikidza nekushandura hukama hunotsiviwa hwezviviri zvinotsiva.
High-viscosity cellulose ether aqueous solution ine high thixotropy, iyo iriwo hunhu hukuru hwe cellulose ether. Aqueous solutions yeMC polymers kazhinji ane pseudoplastic uye isiri-thixotropic fluidity pazasi petembiricha yavo yegel, asi Newtonian inoyerera zvivakwa pazasi shear mitengo. Pseudoplasticity inowedzera nehuremu hwemamorekuru kana kuungana kweselulosi ether, zvisinei nerudzi rwechinotsiva uye dhigirii rekutsiva. Nokudaro, cellulose ethers yegiredhi rimwechete viscosity, zvisinei MC, HPMC, HEMC, inogara ichiratidza zvakafanana rheological properties chero bedzi kusungirirwa uye kutonhora kuchichengetwa nguva dzose. Magero ekugadzira anoumbwa kana tembiricha yakasimudzwa, uye yakanyanya thixotropic inoyerera inoitika. High concentration uye low viscosity cellulose ethers inoratidza thixotropy kunyange pasi pekushisa kwegel. Ichi chivakwa chinobatsira zvikuru kugadziridzwa kwemazinga uye kusagika mukuvaka dhaka rekuvaka.
Zvinoda kutsanangurwa pano kuti iyo yakakwirira viscosity yecellulose ether, zviri nani kuchengetwa kwemvura, asi kukwirisa viscosity, kunowedzera kuenzana kwema molecular huremu hwe cellulose ether, uye kuderera kunowirirana mukunyungudika kwayo, izvo zvine kukanganisa kwakashata pakusangana kwedhaka uye kuita kwekuvaka. Iyo yakakwirira viscosity, iyo inonyanya kuoneka iyo thickening maitiro padhaka, asi haina kuenzana zvachose. Imwe yepakati uye yakaderera viscosity, asi iyo yakagadziridzwa cellulose ether ine zvirinani kuita mukuvandudza simba rechimiro chedhaka rakanyorova. Nekuwedzera kwe viscosity, kuchengetwa kwemvura kwe cellulose ether kunovandudza.
Nguva yekutumira: Kubvumbi-28-2024