Cellulose ether ine yakanakisa kuchengetedza mvura, iyo inogona kudzivirira mwando mudhaka rakanyorova kubva pakunyungudika nguva isati yakwana kana kunyudzwa ne base layer, uye ive nechokwadi chekuti simende yakazara hydrated, nokudaro pakupedzisira kuve nechokwadi chemichina yedhaka, iyo inonyanya kubatsira. kune yakaonda-layer dhaka uye mvura-inotora base layers Kana dhaka rakavakwa pasi pekushisa kwepamusoro uye mamiriro akaoma. Iko kuchengetwa kwemvura kwe cellulose ether kunogona kushandura maitiro ekuvaka echinyakare uye kugadzirisa kufambira mberi kwekuvaka. Semuenzaniso, kuvaka plastering kunogona kuitwa pamvura-inonwisa substrates pasina pre-wetting.
Iyo viscosity, dosage, ambient tembiricha uye chimiro chemolecular ye cellulose ether ine simba guru pakuita kwayo kuchengetedza mvura. Pasi pemamiriro akafanana, iyo yakakura viscosity ye cellulose ether, zviri nani kuchengetedza mvura; iyo yakakwira dosage, zviri nani kuchengetedza mvura. Kazhinji, shoma shoma ye cellulose ether inogona kuvandudza zvakanyanya kuchengetwa kwemvura kwedhaka. Kana iyo dosi inosvika pane imwe Kana chiyero chekuchengetedza mvura chinowedzera, maitiro ekuchengetedza mvura anononoka; kana tembiricha yakadzikama ichikwira, kuchengetwa kwemvura ye cellulose ether kunowanzo kuderera, asi mamwe akagadziridzwa cellulose ethers anewo kuchengetwa kwemvura kuri nani pasi pemamiriro ekupisa kwepamusoro; mafiber ane akaderera madhigirii ekutsiva Vegan ether ine nani kuchengetedza mvura kuita.
Iro hydroxyl boka pa cellulose ether molecule uye atomu yeokisijeni pane ether bond ichabatana nemvura molecule kuumba hydrogen bond, kushandura mvura yakasununguka mumvura yakasungwa, nokudaro ichiita basa rakanaka mukuchengetedza mvura; iyo molecule yemvura uye cellulose ether molecular chain Interdiffusion inobvumira mamorekuru emvura kuti apinde mukati me cellulose ether macromolecular chain uye ari pasi pemasimba akasimba ekusunga, nokudaro achigadzira mvura yakasungwa uye mvura yakasungirirwa, iyo inovandudza kuchengetwa kwemvura ye simenti slurry; cellulose ether inovandudza iyo nyowani simende slurry. Rheological properties, porous network structure uye osmotic pressure kana firimu-forming properties ye cellulose ether inotadzisa kupararira kwemvura.
Cellulose ether inopa dhaka rakanyorova neakanakisa viscosity, iyo inogona kuwedzera zvakanyanya kugona kwekubatanidza pakati pedhaka rakanyorova uye base layer, uye kuvandudza mashandiro e-anti-sagging edhaka. Inoshandiswa zvakanyanya mukupura dhaka, zvidhinha kubatanidza dhaka uye yekunze madziro ekudzivirira system. Iko kukora mhedzisiro ye cellulose ether inogona zvakare kuwedzera anti-kupararira kugona uye homogeneity yezvichangobva kusanganiswa zvinhu, kudzivirira zvinhu delamination, kupatsanura uye kubuda ropa, uye inogona kushandiswa mufiber kongiri, pasi pemvura kongiri uye yega-compacting kongiri.
Iko kukora kweiyo cellulose ether pane simende-based zvinhu kunobva kune viscosity ye cellulose ether solution. Pasi pemamiriro akafanana, kukwirisa viscosity ye cellulose ether, zviri nani kupenya kweyakagadziridzwa simende-based material, asi kana viscosity yakanyanya kuwanda, inokanganisa kuyerera uye kushanda kwechinhu (sekunamira banga rekupurasita. ) Kuzvimisa-leveling dhaka uye self-compacting kongiri, iyo inoda yakakwira fluidity, inoda yakaderera viscosity ye cellulose ether. Uye zvakare, iyo thickening mhedzisiro ye cellulose ether inowedzera kudiwa kwemvura yesimende-yakavakirwa zvinhu uye kuwedzera goho redhaka.
Iyo viscosity ye cellulose ether mhinduro inoenderana nezvinhu zvinotevera: molecular uremu hwe cellulose ether, concentration, tembiricha, shear rate uye nzira yekuyedza. Pasi pemamiriro akafanana, iyo yakakura iyo molecular weight ye cellulose ether, iyo yakakwirira viscosity yemhinduro; iyo yakakwirira yekuisa pfungwa, iyo yakakwirira viscosity yemhinduro. Paunenge uchiishandisa, kutarisirwa kunofanira kutorwa kuti udzivise dosage yakawandisa uye kukanganisa kushanda kwedhaka uye kongiri; cellulose ether Iyo viscosity ye ether solution ichaderera nekuwedzera kwekushisa, uye iyo yakakwirira yekuisa, inowedzera simba rekushisa; cellulose ether solution inowanzova pseudoplastic fluid ine pfuma yekuveura kutetepa, iyo yakakura yeshear rate panguva yekuedzwa, iyo diki viscosity, saka, kubatana kwedhaka kunoderera pasi pekuita kwesimba rekunze, iro rinobatsira kune kuchera kuvaka kwedhaka, kuitira kuti dhaka rive nekushanda kwakanaka uye kubatana panguva imwe chete; nekuti iyo cellulose ether mhinduro haisi yeNewtonian Pazvinwiwa, kana nzira dzekuyedza, zviridzwa uye midziyo kana nzvimbo dzekuyedza dzinoshandiswa kuyedza viscosity dzakasiyana, mhinduro dzebvunzo dzeimwe cellulose ether mhinduro ichave yakasiyana.
Cellulose ether mamorekuru anogona kugadzirisa mamwe mamorekuru emvura echinhu chitsva pamucheto wecheni yemamorekuru, nokudaro achiwedzera viscosity yemhinduro. Iwo mashetani emaketani e cellulose ether akabatanidzwa kuti aite matatu-dimensional network dhizaini, iyo ichaitawo kuti mhinduro yayo ine aqueous ive yakanaka viscosity.
High-viscosity cellulose ether aqueous solution ine high thixotropy, iyo iriwo hunhu hukuru hwe cellulose ether. Aqueous solutions yemethyl cellulose kazhinji ine pseudoplastic uye isiri-thixotropic fluidity pazasi petembiricha yegel, asi ratidza Newtonian inoyerera zvivakwa pazasi shear mitengo. Pseudoplasticity inowedzera nehuremu hwemamorekuru kana kuungana kweselulosi ether, zvisinei nerudzi rwechinotsiva uye dhigirii rekutsiva. Naizvozvo, cellulose ethers yegiredhi rimwechete viscosity, hazvina mhosva mc, HPmc, HEmc, inogara ichiratidzira zvakafanana rheological properties chero bedzi kusungirirwa uye tembiricha zvichichengetwa. 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 kukwirisa viscosity ye cellulose ether, zviri nani kuchengetwa kwemvura, asi iyo yakakwira viscosity, iyo inokwira yakaenzana molecular uremu hwe cellulose ether, uye kuderera kunoenderana mukunyungudika kwayo, uko kune kukanganisa kwakashata. pamusoro pekugadzirisa kwedhaka uye kushanda 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: Feb-28-2023