Mudhaka rakagadzirirwa-musanganiswa, zvishoma zvishoma zve cellulose ether zvinogona kuvandudza zvakanyanya kushanda kwedhaka rakanyorova. Zvinogona kuonekwa kuti cellulose ether chinhu chikuru chinowedzera chinokanganisa kushanda kwekuvaka kwedhaka. Kusarudza cellulose ethers emhando dzakasiyana, maviscosities akasiyana, akasiyana particle saizi, akasiyana viscosity madhigirii uye akawedzera huwandu anewo maitiro akasiyana pakuvandudza kushanda kwedhaka rakaoma. Parizvino, akawanda masonry uye plastering madhaka ane hurombo hwekuchengeta mvura. Iyo slurry yemvura ichaparadzana mushure mekuisiya yega kwemaminitsi mashoma. Nokudaro, zvakakosha zvikuru kuwedzera cellulose ether kune sement mortar. Ngatitarisei zvakadzama nezve mashandiro e cellulose ether mudhaka sesimende!
1.Cellulose ether-mvura kuchengetedza
Kuchengetwa kwemvura chinhu chakakosha che cellulose ether, uye zvakare inzvimbo iyo vazhinji vanogadzira mudzimba yakaoma-musanganiswa vanogadzira dhaka, kunyanya avo vari mudunhu rekumaodzanyemba nekupisa kwakanyanya, vanoteerera. Mukugadzirwa kwezvinhu zvekuvaka, kunyanya yakaoma-musanganiswa dhaka, cellulose ether inoita basa risingadzokerike, 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 mwero wekuchengetedza mvura yedhaka. Kana iyo dosage inosvika pane imwe nhanho, maitiro ekuwedzera ekuchengetedza mvura anononoka; kuchengetwa kwemvura ye cellulose ether kunowanzo kuderera nekuwedzera kwekushisa kwemukati, asi mamwe akagadziridzwa cellulose ethers anewo kuchengetwa kwemvura kwakanaka pasi pemamiriro ekupisa; cellulose ethers ine yakaderera substitution degree ine nani kuchengetedza mvura kuita.
Mapoka e hydroxyl pa cellulose ether molecules uye maatomu eokisijeni pazvisungo zveether zvichagadzira hydrogen bonds nemamorekuru emvura, kushandura mvura yakasununguka mumvura yakasungwa, nokudaro ichiita basa rakanaka mukuchengetedza mvura; kuwirirana pakati pemamorekuru emvura uye cellulose ether molecular cheni inobvumira mamorekuru emvura kuti apinde mukati me cellulose ether macromolecular chain uye ave pasi pezvipingamupinyi zvakasimba, nokudaro achigadzira mvura yakasununguka uye mvura yakasungirirwa, nokudaro achivandudza kuchengetwa kwemvura ye simenti slurry; cellulose ether inovandudza rheological properties, porous network structure uye osmotic pressure ye fresh simende slurry, kana firimu-kugadzira zvinhu zve cellulose ether zvinotadzisa kupararira kwemvura.
2.Cellulose ether-thickening uye thixotropy
Cellulose ether inopa dhaka rakanyorova rakanakisa viscosity, iyo inogona zvakanyanya kuwedzera kugona kwekubatanidza pakati pedhaka rakanyorova uye base layer, uye kugadzirisa anti-sag kuita kwedhaka. Inoshandiswa zvakanyanya mukupurasita dhaka, tile bonding mortar uye ekunze madziro ekudzivirira masisitimu. Iko kukora mhedzisiro ye cellulose ether inogona zvakare kuwedzera kupararira kuramba uye homogeneity yezvinhu zvitsva, kudzivirira zvinhu delamination, kupatsanurwa uye kubuda ropa, uye inogona kushandiswa mufiber kongiri, pasi pemvura kongiri uye yekuzvigadzirisa kongiri.
Iko kukora kweiyo cellulose ether pane simende-based zvinhu kunobva kune viscosity yemushonga we cellulose ether. Pasi pemamiriro akafanana, iyo yakakwirira viscosity ye cellulose ether, zviri nani kutaridzika kweiyo yakagadziridzwa simende-based material. Nekudaro, kana iyo viscosity yakanyanya kukwirira, inokanganisa kuyerera uye kushanda kwechinhu (sekunamatira kune banga replaster). Madhaka ekuzvimisa-leveling uye self-compacting kongiri inoda yakakwira fluidity inoda yakaderera viscosity ye cellulose ether. Pamusoro pezvo, iko kukora kweselulosi ethers kunowedzera kudiwa kwemvura yesimende-yakavakirwa zvinhu uye inowedzera goho revhu.
High-viscosity cellulose ether aqueous solution ine high thixotropy, iyo iriwo hunhu hukuru hwe cellulose ether. Aqueous mhinduro dzemethylcellulose kazhinji dzine pseudoplastic, isiri-thixotropic inoyerera zvivakwa pazasi petembiricha yavo yegel, asi inoratidza Newtonian inoyerera zvivakwa pazasi shear mitengo. Pseudoplasticity inowedzera nekuwedzera kwehuremu hwema molecular kana kuungana kwe cellulose ether, zvisinei nerudzi uye dhigirii rekutsiviwa kweanotsiva. Naizvozvo, cellulose ethers yegiredhi rimwechete viscosity, ingave MC, HPMC, kana HEMC, inogara ichiratidzira zvakafanana rheological properties chero bedzi kusungirirwa uye tembiricha zvichichengetwa. Kana kutonhora kuchiwedzerwa, gel yemaitiro inoumbwa uye yakakwirira thixotropic inoyerera inoitika.
High concentrations uye low viscosity cellulose ethers inoratidza thixotropy kunyange pasi pekushisa kwegel. Ichi chivakwa chinobatsira zvikuru mukugadzirisa kuenzana uye sagging zvivakwa zvekuvaka dhaka panguva yekuvaka. Zvinofanira kucherechedzwa pano kuti iyo yakakwira viscosity ye cellulose ether, zviri nani kuchengetedza mvura, asi iyo yakakwira viscosity, iyo inokwira yakaenzana molecular uremu hwe cellulose ether, uye kunyungudika kwayo kunoderera zvinoenderana, izvo zvinokanganisa iyo dhaka concentration uye kuita kwekuvaka.
3.Cellulose ether-air entraining effect
Cellulose ether ine yakakosha mhepo intraining mhedzisiro pane nyowani simende-yakavakirwa zvinhu. Cellulose ether ine ese ari maviri hydrophilic mapoka (hydroxyl mapoka, ether mapoka) uye hydrophobic mapoka (methyl groups, glucose mhete). Iyo i surfactant ine basa repamusoro uye nekudaro ine mhepo inopinza maitiro. Mhepo inopinda mumhepo ye cellulose ether ichagadzira "bhora" mhedzisiro, iyo inogona kuvandudza kushanda kwezvichangobva kusanganiswa zvinhu, sekuwedzera mapurasitiki uye kutsvedzereka kwedhaka panguva yekushanda, iyo inobatsira pakugadzira dhaka; ichawedzerawo kubuda kwedhaka uye kuderedza mutengo wekugadzira dhaka; asi ichawedzera porosity yezvinhu zvakaomeswa uye kuderedza mashandiro avo emagetsi senge simba uye elastic modulus.
Sezvinoita surfactant, cellulose ether inewo yekunyorova kana yekuzora pazvimedu zvesimende, izvo pamwe chete nemhepo yayo inopinza mhedzisiro inowedzera fluidity yesimende-yakavakirwa zvinhu, asi kukora kwayo kunoderedza fluidity. Mhedzisiro ye cellulose ether pane fluidity ye simende-yakavakirwa zvinhu musanganiswa weplasticization uye thickening mhedzisiro. Kazhinji kutaura, kana iyo cellulose ether dosage yakadzikira, inonyanya kuratidza sepurasitiki kana kuderedza mvura; kana iyo dosi yakakwira, iyo thickening mhedzisiro ye cellulose ether inowedzera nekukurumidza, uye iyo mhepo inopinza mhedzisiro inoita kuzara, saka inotaridza sekukora mhedzisiro kana kuwedzera kudiwa kwemvura.
4.Cellulose ether-retarding effect
Cellulose ether icharebesa nguva yekuisa simende paste kana dhaka uye kunonoka simende hydration dynamics, iyo inobatsira kuwedzera nguva yekushanda yechinhu chitsva chekusanganiswa uye kuvandudza kurasikirwa kunoenderana nenguva yekusagadzikana kwedhaka uye kudonha kwekongiri, asi zvinogona zvakare. kunonotsa kufambira mberi kwekuvaka.
Nguva yekutumira: Sep-24-2024