Mukugadzirwa kwezvinhu zvekuvaka, kunyanya dry powder mortar,ether ye celluloseine basa rakakosha, kunyanya mukugadzirwa kwesimbi yakakosha (modified mortar), chinhu chakakosha. Basa rakakosha reether inonyungudika mumvura musimbi inonyanya kukosha kwekuchengetedza mvura. Mhedzisiro yekuchengetedza mvura yeether yecellulose inoenderana nekunyudzwa kwemvura kwechigadziko, kuumbwa kwesimbi, ukobvu hwesimbi, kudiwa kwemvura kwesimbi, uye nguva yekuiswa kwezvinhu zvesimbi.
Matombo mazhinji ekugadzira nekuisa plaster haabati mvura zvakanaka, uye mvura netsvina zvinozoparadzana mushure memaminitsi mashoma ekugara. Kuchengetwa kwemvura ibasa rakakosha remethyl cellulose ether, uye ibasa iro vagadziri vematongo emumba, kunyanya avo vari kumaodzanyemba kwenzvimbo dzine tembiricha yakakwira, vanoteerera. Zvinhu zvinokanganisa mhedzisiro yekuchengetedza mvura yematope eupfu hwakaoma zvinosanganisira huwandu hwekuwedzera, viscosity, kupfava kwezvikamu, uye tembiricha yenzvimbo inoshandiswa.
Kuchengetwa kwemvura kweether ye celluloseIyo pachayo inobva mukunyungudika uye kupera simba kwe cellulose ether pachayo. Sezvatinoziva tese, kunyangwe cellulose molecular chain ine huwandu hwakawanda hwe OH groups dzinonyungudika zvakanyanya, hainyungudike mumvura, nekuti chimiro che cellulose chine mwero wepamusoro we crystallinity. Kugona kwe hydration kwe hydroxyl groups chete hakuna kukwana kufukidza hydrogen bonds dzakasimba uye van der Waals forces pakati pema molecules. Nokudaro, inongozvimba chete asi hainyungudike mumvura. Kana substituent ikapinzwa mu molecular chain, haisi substituent chete inoparadza hydrogen chain, asiwo interchain hydrogen bond inoparadzwa nekuda kwe wedging ye substituent pakati pema chains ari pedyo. Substituent yakakura, daro riri pakati pema molecules rakakura. Daro riripo. Kana mhedzisiro yekuparadza hydrogen bonds yakakura, cellulose ether inonyungudika mumvura mushure mekunge cellulose lattice yawedzera uye mhinduro ichipinda, ichigadzira high-viscosity solution. Kana tembiricha yakwira, hydration ye polymer inoderera, uye mvura iri pakati pema chains inodzingwa. Kana mvura yapera yakakwana, mamorekuru anotanga kuungana, oita gel yechimiro che network ine mativi matatu uye opetwa.
Kazhinji, kana viscosity yakakwira, zvinoita kuti mvura irambe ichichengetwa. Zvisinei, kana viscosity yakakwira uye huremu hwemamorekuru hwakakwira, kudzikira kwekunyungudika kwayo kuchaita kuti simba remuto rive rakashata uye mashandiro ekuvaka. Kana viscosity yakakwira, zvinoita kuti ganda rive rakasimba, asi harina kuenzana zvakananga. Kana viscosity yakakwira, ndipo pachava neviscosity yakawanda, ndiko kuti, panguva yekuvaka, inoonekwa seinonamatira pa scraper uye ine glue yakakwira ku substrate. Asi hazvibatsiri kuwedzera simba rekuvaka remuto wet. Panguva yekuvaka, kushanda kwe anti-sag hakusi pachena. Kusiyana neizvi, mamwe viscosity yepakati nepasi asi methyl yakagadziriswa.ethers dze cellulosevane basa rakanaka kwazvo mukuvandudza kusimba kwechimiro chedhaka rakanyorova.
Nguva yekutumira: Kubvumbi-25-2024