Mapoka ehydroxyl ari paether ye cellulosemamorekuru nemaatomu eokisijeni ari pazvisungo zve ether zvinoumba zvisungo zvehydrogen nemamorekuru emvura, zvichishandura mvura yakasununguka kuita mvura yakasungwa, nokudaro zvichiita basa rakanaka mukuchengetedza mvura; kupararira kwemvura pakati pemamorekuru emvura nemaketani e cellulose ether zvinobvumira mamorekuru emvura kupinda mukati meketani yemacromolecular ether ye cellulose uye kuzviisa pasi pezvirambidzo zvakasimba, nokudaro zvichigadzira mvura yakasununguka nemvura yakasungwa, izvo zvinovandudza kuchengetedza mvura kwe slurry yesimende; cellulose ether inovandudza rheological properties, porous network structure uye osmotic pressure ye fresh cement slurry kana firimu-forming properties ye cellulose ether inodzivisa kupararira kwemvura.
Kuchengetwa kwemvura kwe cellulose ether pachayo kunobva mukunyungudika uye kupera simba kwe cellulose ether pachayo. Kugona kwe hydration kwe hydroxyl groups chete hakukwani kubhadhara simba re hydrogen bonds uye van der Waals forces pakati pema molecules, saka inongozvimba chete asi hainyungudike mumvura. Kana ma substituents akapinzwa mu molecular chain, ma substituents haasi kungoparadza chete ma hydrogen chains, asiwo ma interchain hydrogen bonds anoparadzwa nekuda kwekubatana kwema substituents pakati pema chains ari pedyo. Kana ma substituents akakura, daro riri pakati pema molecules rakakura, uye mhedzisiro yekuparadza ma hydrogen bonds yakakura. Mushure mekunge cellulose lattice yazvimba, mhinduro inopinda, uye cellulose ether inonyungudika mumvura, ichigadzira high-viscosity solution, iyo inobva yaita basa mukuchengetedza mvura.
Zvinhu zvinokanganisa mashandiro ekuchengetedza mvura:
Kusviba: Kusviba kwe cellulose ether kwakakura, ndiko kuri nani kuchengetedza mvura, asi kusviba kwakakwira, ndiko kuwedzera kwehuremu hwe cellulose ether, uye kunyungudika kwayo kunoderera zvinoenderana, izvo zvine mhedzisiro yakaipa pakuwanda uye kushanda kwekuvaka kwemortar. Kazhinji, pachigadzirwa chimwe chete, mhedzisiro yeviscosity inoyerwa nenzira dzakasiyana dzakasiyana, saka kana uchienzanisa viscosity, inofanira kuitwa pakati penzira dzakafanana dzekuyedza (kusanganisira tembiricha, rotor, nezvimwewo).
Huwandu hwekuwedzera: Kana huwandu hwe cellulose ether hukawedzerwa mumota, zvinoita kuti kuchengetedza mvura kurambe kuri nani. Kazhinji, huwandu hushoma hwe cellulose ether hunogona kuvandudza zvakanyanya huwandu hwekuchengetedza mvura mumota. Kana huwandu hwacho hwasvika padanho rakati, maitiro ekuwedzera kwekuchengetedza mvura anoderera.
Kupfava kwezvikamu: Kana zvikamu zvidiki zvikanyanya, kuchengetedza mvura kunowedzera kunaka. Kana zvikamu zvikuru zve cellulose ether zvikasangana nemvura, pamusoro payo panobva panyungudika uye panobva paita gel yekuputira zvinhu kuti mamorekuru emvura asarambe achipinda. Dzimwe nguva, kunyangwe kusanganisa kwenguva refu hakugone kuita kuti pave nekupararira kwakafanana uye kunyungudika, zvichigadzira mhinduro ye flocculent kana agglomeration, izvo zvinokanganisa zvakanyanya kuchengetedza mvura ye cellulose ether. Kunyungudika ndechimwe chezvinhu zvinosarudza cellulose ether. Kupfava zvakare chiratidzo chakakosha chekushanda kwe methyl cellulose ether. Kupfava kunokanganisa kunyungudika kwe methyl cellulose ether. Coarser MC inowanzo kuve granular uye inogona kunyungudika nyore nyore mumvura isina agglomeration, asi mwero wekunyungudika unononoka zvikuru uye hauna kukodzera kushandiswa mumortar yakaoma.
Tembiricha: Sezvo tembiricha yemhepo ichikwira, kuchengetedza mvura kwe cellulose ethers kunowanzo derera, asi mamwe ma modified cellulose ethers anewo kuchengetedza mvura kwakanaka pasi pemamiriro ekupisa kwakanyanya; kana tembiricha yakwira, hydration yemapolymers inoderera, uye mvura iri pakati pemaketani inobuda. Kana mvura yakwana, mamorekuru anotanga kuungana kuti aumbe network structure gel ine mativi matatu.
Maumbirwo emamorekuru: Cellulose ethers ine nzvimbo shoma inochengetedza mvura zviri nani.
Kukora uye thixotropy
Kukora:
Mhedzisiro pakukwanisa kubatana uye kudzivirira kudonha: Cellulose ethers inopa dhaka rakanyorova kunaka, izvo zvinogona kuwedzera zvakanyanya kugona kubatana kwedhaka rakanyorova nehwaro hwepasi uye kuvandudza mashandiro edhaka rekunyorova. Rinoshandiswa zvakanyanya mudhaka rekupurasita, dhaka rekunamatira mataira uye system yekudzikamisa madziro ekunze 3.
Mhedzisiro pakuenzana kwezvinhu: Kukora kwe ether dze cellulose kunogonawo kuwedzera kugona kwekudzivirira kupararira uye kuenzana kwezvinhu zvitsva zvakasanganiswa, kudzivirira kupatsanurwa kwezvinhu, kupatsanurwa uye kubuda kwemvura, uye kunogona kushandiswa mu faibha concrete, pasi pemvura concrete uye concrete inozvibatanidza.
Kunobva uye simba rekukora: Kukora kwe cellulose ether pazvinhu zvakagadzirwa nesimende kunobva mukukora kwe cellulose ether solution. Mumamiriro ezvinhu akafanana, kukora kwe cellulose ether, kukora kwezvishandiso zvakagadzirwa nesimende zvakagadziriswa kunowedzera kunaka, asi kana kukora kwakanyanya, zvinokanganisa kukora uye kushanda kwezvinhu (sekunamatira pabanga rekupurasita). Kugadzira simbi yesimbi yega yega uye concrete inozvibatanidza pachayo ine zvinodiwa zvekukora zvakanyanya zvinoda kukora kwakaderera kwe cellulose ether. Pamusoro pezvo, kukora kwe cellulose ether kuchawedzerawo kudiwa kwemvura kwezvinhu zvakagadzirwa nesimende uye kuwedzera kubuda kwesimbi.
Thixotropy:
Mhinduro yemvura ine viscosity yakanyanya ye cellulose ether ine thixotropy yakakwira, inovawo hunhu hukuru hwe cellulose ether. Mhinduro yemvura yemethyl cellulose inowanzova nepseudoplasticity uye non-thixotropic fluidity pasi petembiricha yayo yegel, asi inoratidza hunhu hweNewtonian flow pamazinga akaderera ekucheka. Pseudoplasticity inowedzera nekuwedzera kwe cellulose ether molecular weight kana concentration, uye haina chekuita nerudzi rwe substituent uye degree yekutsiva. Naizvozvo, cellulose ethers ye viscosity grade imwechete, ingave MC, HPMC, kana HEMC, inogara ichiratidza hunhu hwakafanana hwe rheological chero bedzi concentration netembiricha zvichiramba zvakadaro. Kana tembiricha yakwira, structural gel inoumbwa, uye kuyerera kwe thixotropic kwakakwira kunoitika. Cellulose ethers ine concentration yakakwira uye low viscosity inoratidza thixotropy kunyangwe pasi petembiricha yegel. Hunhu uhwu hunobatsira zvikuru pakugadzirisa leveling uye sagging yebuilding mortar panguva yekuvaka.
Kupinda mumhepo
Nheyo uye mhedzisiro pakushanda: Cellulose ether ine mhedzisiro yakakura yekupinda kwemhepo pazvinhu zvitsva zvakagadzirwa nesimende. Cellulose ether ine mapoka emvura anofema (mapoka ehydroxyl, mapoka eether) uye mapoka emvura anofema (mapoka emethyl, glucose rings). Isurfactant ine basa repamusoro, nokudaro iine mhedzisiro yekupinda kwemhepo. Mhedzisiro yekupinda kwemhepo ichaita kuti pave nemhedzisiro yebhora, iyo inogona kuvandudza mashandiro ekushanda kwezvinhu zvitsva zvakasanganiswa, zvakaita sekuwedzera plasticity uye kutsetseka kwedhaka panguva yekushanda, izvo zvinobatsira pakupararira kwedhaka; zvichawedzerawo kubuda kwedhaka uye kuderedza mutengo wekugadzira dhaka.
Mhedzisiro pahunhu hwemakanika: Mhedzisiro yekupinda kwemhepo inowedzera kupinza kwechinhu chakaomarara uye inoderedza hunhu hwacho hwemakanika hwakadai sekusimba uye elastic modulus.
Mhedzisiro pakuyerera kwemvura: Sechinhu chinogadzira mvura, cellulose ether inewo simba rekunyorovesa kana kukwiza mafuta pazvikamu zvesimende, izvo pamwe chete nekushanda kwayo kwemhepo kunowedzera kuyerera kwezvinhu zvakagadzirwa nesimende, asi kukora kwayo kunoderedza kuyerera kwemvura. Mhedzisiro ye cellulose ether pakuyerera kwezvinhu zvakagadzirwa nesimende musanganiswa wekuita purasitiki nekukora. Kazhinji, kana chiyero che cellulose ether chakaderera, chinonyanya kuoneka sekuita plasticizing kana kuderedza mvura; kana chiyero chakakwira, kukora kwe cellulose ether kunowedzera nekukurumidza, uye kushanda kwayo kwemhepo kunowanzo kuzara, saka kunoratidzwa sekukora kana kuwedzera kwekuda kwemvura.
Nguva yekutumira: Zvita-23-2024