Mumatope akagadzirira-akavhenganiswa, kureba zvishomacellulose etherinogona kuvandudza zvakanyanya kushanda kwedhaka rakanyorova, zvinogona kuonekwa kuti cellulose ether inonyanya kuwedzera iyo inokanganisa kushanda kwekuvaka kwedhaka.
Kusarudzwa kwemarudzi akasiyana-siyana, maviscosities akasiyana, mashizha akasiyana-siyana, madhigirii akasiyana-siyana eviscosity uye kuwedzerwa kwe cellulose ethers kunewo maitiro akasiyana-siyana pakuvandudzwa kwekushanda kwevhu rakaoma dhaka. Parizvino, akawanda masonry uye plastering madhaka ane hurombo hwekuchengeta mvura kuita, uye slurry yemvura ichaparadzana mushure memaminitsi mashoma ekumira. Saka zvakakosha zvikuru kuwedzera cellulose ether mudhaka resimende.
kuchengetedza mvura
Kuchengetwa kwemvura ibasa rakakosha remethyl cellulose ether, uye zvakare kuita kunoita kuti vazhinji vedzimba vanogadzira dhaka vanogadzira dhaka, kunyanya avo vari kumatunhu ekumaodzanyemba ane tembiricha yakanyanya, vanoteerera.
Mukugadzirwa kwezvinhu zvekuvaka, kunyanya yakaoma poda dhaka, cellulose ether inoita basa risingadzoreki, kunyanya mukugadzirwa kwedhaka rakakosha (yakagadziridzwa dhaka), chinhu chakakosha uye chakakosha chikamu.
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, nekudaro achigadzira mvura yemahara, mvura yakakanyiwa, nekuvandudza kuchengetwa kwemvura ye simenti slurry; cellulose ether inovandudza simende itsva slurry Iyo rheological properties, porous network structure uye osmotic pressure kana firimu-kugadzira zvinhu zve cellulose ether zvinotadzisa kupararira kwemvura.
kukora uye thixotropy
Cellulose etherinoisa dhaka rakanyorova rine yakanakisa viscosity, iyo inogona kuwedzera zvakanyanya kugona kwekubatanidza pakati pedhaka rakanyorova uye base layer, uye kugadzirisa iyo anti-sagging kuita kwedhaka. 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, kukwira kwe viscosity ye cellulose ether, zviri nani kutaridzika kweiyo yakagadziridzwa 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.
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. 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 kukwirisa viscosity ye cellulose ether, zviri nani kuchengetwa kwemvura, asi iyo yakakwira viscosity, iyo yakakwira yakaenzana molecular uremu hwe cellulose ether, uye kuderera kunoenderana mukunyungudika kwayo, izvo zvine kukanganisa kwakashata pakusangana kwedhaka uye kuita kwekuvaka.
Air-entraining
Cellulose ether ine mhepo-inopinza mhedzisiro pane nyowani simende-yakavakirwa zvinhu. Cellulose ether ine ese ane hydrophilic mapoka (hydroxyl groups, ether groups) uye hydrophobic mapoka (methyl groups, glucose mhete), uye inoshambira ine basa repamusoro, nokudaro iine mweya-entraining maitiro. Mhepo-entraining effect ye cellulose ether ichabudisa "bhora" mhedzisiro, iyo inogona kuvandudza kushanda kwezvinhu zvitsva zvakasanganiswa, zvakadai sekuwedzera mapurasitiki uye kutsetseka kwedhaka panguva yekushanda, iyo inobatsira pakupararira kwedhaka; iyo ichawedzerawo kubuda kwedhaka, kuderedza mutengo wekugadzira dhaka; asi ichawedzera porosity yezvinhu zvakaomeswa uye kuderedza ma mechanical ayo akadai sesimba uye elastic modulus.
Sezvinoita surfactant, cellulose ether inewo kunyorova kana mafuta ekuzora pazvimedu zvesimende, izvo zvinowedzera kuyerera kwesimende-based zvinhu pamwe chete nemhepo-entraining mhedzisiro, asi kukobvu kwayo kunoderedza fluidity. Mhedzisiro ye fluidity musanganiswa weplasticizing uye thickening mhedzisiro. Kazhinji kutaura, kana zvinyorwa zve cellulose ether zvakanyanya kuderera, basa guru ndiro plasticization kana kuderedza mvura; kana zviri mukati zvakakwirira, iyo thickening mhedzisiro ye cellulose ether inowedzera nekukurumidza, uye iyo mhepo-entraining mhedzisiro inoita kunge yakazara. Saka inoratidza seyakakora mhedzisiro kana kuwedzera kwekudiwa kwemvura.
kunonoka
Cellulose ethericharebesa nguva yekugadzika simende paste kana dhaka, uye kunonoka hydration kinetics ye simenti, iyo inobatsira kuvandudza nguva yekushanda kwezvinhu zvitsva zvakasanganiswa, kuvandudza kuwirirana kwedhaka uye kurasikirwa kwekongiri kudonha nekufamba kwenguva, asi zvinogona kukonzera Kunonoka kuvaka.
Nguva yekutumira: Kubvumbi-25-2024