Mudhaka rakagadzirira-musanganiswa, chete cellulose ether shoma inogona kuvandudza zvakanyanya kushanda kwedhaka rakanyorova. Zvinogona kuonekwa kuti cellulose ether ndiyo inonyanya kuwedzera iyo inokanganisa kushanda kwekushanda kwedhaka.
Kusarudza marudzi akasiyana-siyana e-cellulose ethers ane viscosities yakasiyana, mashizha akasiyana-siyana, madhigirii akasiyana-siyana eviscosity uye akawedzera huwandu huchavawo nemigumisiro yakasiyana pakuvandudzwa kwekuita kwe drymix mortar. Parizvino, akawanda masonry uye plastering madhaka ane kushomeka kwekuchengetedza mvura kuita. Mvura uye slurry zvichaparadzaniswa mushure memaminitsi mashomanana ekumira. Saka zvakakosha zvikuru kuwedzera cellulose ether kudhaka resimende.
Ngatitarisei zvakanyanya basa re cellulose ether mudhaka sesimende!
1. Cellulose ether--Kuchengeta mvura
Kuchengetedzwa kwemvura kuita kwakakosha kwemethyl cellulose ether, uye zvakare kuita kunoitwa nevazhinji vekumba yakaoma-musanganiswa vanogadzira dhaka, kunyanya avo vari kumatunhu ekumaodzanyemba ane tembiricha yepamusoro inoteerera. 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 yakakwirira yedosi, zviri nani kuchengetedza mvura. Kazhinji, diki dosage ye cellulose ether inogona kuvandudza zvakanyanya kuchengetwa kwemvura kwedhaka. Apo dhigirii inosvika kune imwe, apo chiyero chekuchengetedza mvura chinowedzera, maitiro ekuchengetedza mvura anononoka; Kana tembiricha ye ambient yakwira, kuchengetwa kwemvura kwe cellulose ether kunowanzo kuderera. Asi mamwe akagadziridzwa cellulose ethers anewo kuchengetedzwa kwemvura kuri nani pasi pemamiriro ekushisa kwakanyanya; Cellulose ether ine madhigirii akaderera ekutsiva ane kuita kurinani kwekuchengetedza mvura.
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;Themolecule yemvura uye cellulose ether molecular chain Interdiffusion inobvumira mamorekuru emvura kupinda mukati me cellulose ether macromolecular chain uye ari pasi pemasimba akasimba ekusunga, nekudaro achigadzira mvura yemahara, mvura yakakanyiwa, uye kuvandudza kuchengetwa kwemvura ye simenti slurry; Cellulose ether inovandudza simende slurry's rheological properties itsva, porous network structure uye osmotic pressure kana firimu-kugadzira zvinhu zve cellulose ether zvinotadzisa kupararira kwemvura.
2. Cellulose ethers - Thickening uye Thixotropy
Cellulose ether inopa dhaka rakanyorova rine viscosity yakanakisa, iyo inogona kuwedzera zvakanyanya kugona kwekubatanidza pakati pedhaka rakanyorova uye base layer, uye kugadzirisa iyo anti-sag 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 yezvinhu zvitsva zvakasanganiswa, kudzivirira zvinhu delamination uye kupatsanura. Inogona kushandiswa mufiber kongiri, pasi pemvura kongiri uye self-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 ichawedzera 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. Naizvozvo, cellulose ethers yegiredhi rimwechete viscosity, ingave iri HPMC kana HEMC, inogara ichiratidzira zvakafanana rheological properties chero bedzi kusungirirwa uye tembiricha zvichichengetwa 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 inokwira yakaenzana molecular uremu hwe cellulose ether, uye kuderera kunoenderana mukunyungudika kwayo, uko kune kukanganisa kwakashata. pamusoro pekugadzirisa kwedhaka uye kushanda kwekuvaka.
3. Cellulose ether - Air-entraining effect
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 mhedzisiro ye cellulose ether inoburitsa "bhora" mhedzisiro, iyo inogona kuvandudza kushanda kwezvichangobva kusanganiswa zvinhu, 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.
4. Cellulose Ether - Kunonoka
Cellulose ether icharebesa nguva yekuisa simende paste kana dhaka, uye kunonoka hydration kinetics ye simenti, iyo inobatsira kuvandudza nguva yekushanda kwezvinhu zvitsva zvakasanganiswa, kuvandudza kuwirirana kwedhaka uye kurasikirwa kwekongiri inodonha nekufamba kwenguva, asi inogona. kunokonzerawo kunonotsa kufambira mberi kwekuvaka.
Nguva yekutumira: Jun-02-2023