Cellulose ether inogona kuvandudza zvakanyanya kushanda kwedhaka rakanyorova, uye ndiyo inonyanya kuwedzera iyo inokanganisa kushanda kwekuvaka kwedhaka. Kusarudzwa kunonzwisisika kwema cellulose ethers emhando dzakasiyana-siyana, viscosities dzakasiyana, zvakasiyana-siyana zvidimbu, madhigirii akasiyana-siyana eviscosity uye yakawedzerwa mari ichava nemigumisiro yakanaka pakuvandudzwa kwekushanda kwevhu rakaoma dhaka. Parizvino, akawanda masonry uye plastering madhaka ane hurombo hwekuchengeta mvura kuita, uye slurry yemvura ichaparadzana mushure memaminitsi mashoma ekumira. 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. Zvinhu zvinokanganisa kuchengetedza kwemvura kweiyo yakaoma poda dhaka zvinosanganisira huwandu hwekuwedzera, viscosity, kutsetseka kwezvikamu, uye tembiricha yenzvimbo yekushandisa.
Kuchengetwa kwemvura ye cellulose ether
Mukugadzirwa kwezvinhu zvekuvaka, kunyanya yakaoma poda dhaka, cellulose ether inoita basa risingadzoreki, kunyanya mukugadzirwa kwedhaka rakakosha (yakagadziridzwa dhaka), chinhu chakakosha uye chakakosha chikamu. Basa rakakosha remvura-soluble cellulose ether mudhaka rinonyanya kuve nemativi matatu, imwe yakanakisa kuchengetedza mvura, imwe isimba pakuenderana uye thixotropy wedhaka, uye chechitatu ndiko kudyidzana nesamende. Kuchengetedzwa kwemvura kweselulosi ether kunoenderana nekutorwa kwemvura kwegadziko layer, kuumbwa kwedhaka, ukobvu hwedhaka redhaka, kudiwa kwemvura kwedhaka, uye nguva yekumisikidzwa kwechinhu chekugadzika. Kuchengetwa kwemvura kwe cellulose ether pachayo kunobva mukunyungudika uye kupera simba kweselulosi ether pachayo. Sezvo isu tose tinoziva, kunyange zvazvo cellulose molecular chain ine nhamba yakawanda yeakanyanya hydratable OH mapoka, haisi kunyunguduka mumvura, nokuti chimiro che cellulose chine hukuru hwekristallinity. Kugona kwe hydration kwemapoka ehydroxyl chete hakuna kukwana kuvhara mabhondi akasimba ehydrogen uye van der Waals masimba pakati pemamorekuru. Naizvozvo, inongozvimba asi hainyungudika mumvura. Kana chinotsiva chinopinzwa mucheni yemamorekuru, kwete chete chinotsiva chinoparadza cheni yehydrogen, asiwo iyo interchain hydrogen bond inoparadzwa nekuda kwekuroora kweiyo inotsiva pakati pemaketani ari padyo. Iyo yakakura inotsiva, yakakura chinhambwe pakati pemamorekuru. Iyo yakakura chinhambwe. Iyo yakakura mhedzisiro yekuparadza hydrogen zvisungo, iyo cellulose ether inonyungudika mumvura mushure mekunge cellulose lattice ichiwedzera uye mhinduro inopinda, ichigadzira yakakwirira-viscosity mhinduro. Kana kutonhora kuchikwira, hydration yepolymer inopera, uye mvura pakati pemaketani inodzingwa kunze. Kana iyo dehydration effect yakakwana, mamorekuru anotanga kuungana, achigadzira matatu-dimensional network dhizaini gel uye akapetwa kunze.
Kazhinji kutaura, iyo yakakwirira viscosity, zviri nani kuchengetedza mvura. Zvisinei, iyo yakakwirira ye viscosity uye yakakwirira yehuremu hwema molecular, kuderera kunowirirana mukunyungudika kwayo kuchava nemigumisiro yakaipa pakusimba uye kushanda kwekuvaka kwedhaka. Iyo yakakwirira viscosity, iyo inonyanya kuoneka iyo thickening maitiro padhaka, asi haina kuenzana zvakananga. Iyo yakakwirira iyo viscosity, iyo yakanyanya viscous dhaka rakanyorova richava, ndiko kuti, panguva yekuvaka, inoratidzirwa sekunamatira kune scraper uye yakakwirira kunamatira kune substrate. Asi hazvibatsiri kuwedzera simba rekuumbwa kwevhu rakanyorova pacharo. Panguva yekuvaka, iyo anti-sag performance haisi pachena. Pane zvinopesana, imwe yepakati uye yakaderera viscosity asi yakagadziridzwa methyl cellulose ethers ine yakanakisa mashandiro mukuvandudza kusimba kwechimiro chedhaka rakanyorova.
Thickening uye Thixotropy yeCellulose Ether
Kune zvakare hukama hwakanaka hwemutsara pakati pekuenderana kwesamende paste uye dosi ye cellulose ether. Cellulose ether inogona kuwedzera zvakanyanya viscosity yedhaka. Iyo yakakura dosage, zvinonyanya kuoneka mugumisiro. High-viscosity cellulose ether aqueous solution ine high thixotropy, iyo iriwo hunhu hukuru hwe cellulose ether.
Kukora kunoenderana nehuwandu hwepolymerization ye cellulose ether, solution concentration, shear rate, tembiricha uye mamwe mamiriro. Iyo gelling midziyo yemushonga yakasarudzika kune alkyl cellulose uye yakagadziridzwa maderivatives. Iyo gelation zvivakwa zvine hukama neiyo dhigirii yekutsiva, kugadzirisa kugadzirisa uye zvinowedzera. Kune hydroxyalkyl yakagadziridzwa derivatives, iyo gel zvivakwa zvine hukamawo nedhigirii rekuchinja rehydroxyalkyl. Kune yakaderera viscosity MC uye HPMC, 10% -15% mhinduro inogona kugadzirirwa, yepakati viscosity MC uye HPMC inogona kugadzirirwa 5% -10% mhinduro, nepo yakakwirira viscosity MC uye HPMC inogona chete kugadzirira 2% -3% mhinduro, uye Kazhinji. iyo viscosity classification ye cellulose ether inoiswawo grade 1% -2% mhinduro. High molecular weight cellulose ether ine high thickening kunyatsoita. Mune imwecheteyo yekugadzirisa mhinduro, mapolymer ane akasiyana ma molecular uremu ane akasiyana viscosities. High degree. Iyo inonangwa viscosity inogona kuwanikwa chete nekuwedzera yakawanda yakaderera molecular uremu cellulose ether. Viscosity yaro haina kutsamira pachiyero chekuveura, uye iyo yakakwira viscosity inosvika painotariswa viscosity, uye iyo inodiwa yekuwedzera mari idiki, uye viscosity zvinoenderana nekukora kwekuita. Naizvozvo, kuti uwane kumwe kuenderana, imwe chiyero che cellulose ether (concentration yemhinduro) uye mhinduro viscosity inofanira kuvimbiswa. Iyo tembiricha yegel yemushonga zvakare inodzikira mutsetse nekuwedzera kwekusangana kwemhinduro, uye gels pane tembiricha yekamuri mushure mekusvika kumwe kusungwa. Iyo gelling concentration yeHPMC yakakwira zvakanyanya pakamuri tembiricha.
Kunonoka kweCellulose Ether
Basa rechitatu re cellulose ether nderokunonotsa hydration process ye simenti. Cellulose ether inoisa dhaka nezvinhu zvakasiyana-siyana zvinobatsira, uye zvakare inoderedza kupisa kwekutanga kwe hydration ye simenti uye kunonotsa hydration dynamic process ye simenti. Izvi hazvina kunaka pakushandiswa kwedhaka munzvimbo dzinotonhora. Uku kudzoreredza mhedzisiro kunokonzerwa nekushambadza kwe cellulose ether mamorekuru pane hydration zvigadzirwa seCSH uye ca(OH)2. Nekuda kwekuwedzera kweiyo viscosity yemushonga wepore, iyo cellulose ether inoderedza kufamba kweiyoni mumhinduro, nekudaro kunonoka hydration process. Iyo yakanyanya kukwirisa iyo cellulose ether mumineral gel zvinhu, zvakanyanya kutaurwa mhedzisiro yekunonoka kwe hydration. Cellulose ether haingononotse kumisa, asiwo inononoka kuomeswa kwesimende mortar system. Iko kudzoreredza mhedzisiro ye cellulose ether kunoenderana kwete chete nekuisa kwayo mumineral gel system, asiwo pane chimiro chemakemikari. Iyo yakakwirira dhigirii yemethylation yeHEMC, zviri nani kudzoreredza mhedzisiro ye cellulose ether. Chiyero che hydrophilic substitution kune mvura-inowedzera kutsiva Iyo yekudzosa mhedzisiro yakasimba. Nekudaro, iyo viscosity ye cellulose ether haina mhedzisiro pasimende hydration kinetics.
Mudhaka, cellulose ether inoita basa rekuchengetedza mvura, kukora, kunonoka simende hydration simba, uye kunatsiridza mashandiro ekuvaka. Yakanaka kuchengetedza mvura inoita kuti simende hydration iwedzere kuzara, inogona kuvandudza yakanyorova viscosity yedhaka rakanyorova, kuwedzera simba rekubatanidza redhaka, uye kugadzirisa nguva. Kuwedzera cellulose ether kune mechanic yekupfapfaidza dhaka kunogona kuvandudza kupfapfaidza kana kupomba kuita uye kusimba kwechimiro chedhaka. Naizvozvo, cellulose ether iri kushandiswa zvakanyanya sechinhu chakakosha chekuwedzera mune yakagadzirira-yakasanganiswa dhaka
Nguva yekutumira: Zvita-26-2022