Cellulose ether i polymer yakagadzirwa kubva kune yakasikwa cellulose kuburikidza nekugadzirisa kemikari.Cellulose ether inobva kune yakasikwa cellulose.Kugadzirwa kwe cellulose ether kwakasiyana nemapolymer ekugadzira.Yayo inonyanya kukosha ndeye cellulose, yakasikwa polymer musanganiswa.Nekuda kwekusarudzika kwechisikigo cellulose chimiro, iyo cellulose pachayo haina kugona kuita ne etherification agents.Zvisinei, mushure mekurapwa kwechirwere chekuzvimba, zvisungo zvakasimba zvehydrogen pakati pemaketani emaketani nemaketani zvinoparadzwa, uye kusunungurwa kunoshingaira kweboka rehydroxyl kunova reactive alkali cellulose.Wana cellulose ether.
Mune yakagadzirira musanganiswa dhaka, iyo yekuwedzera yakawanda ye cellulose ether yakaderera zvakanyanya, asi inogona zvakanyanya kuvandudza mashandiro edhaka rakanyorova, uye ndicho chinhu chikuru chinowedzera chinokanganisa kuita 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 hwekuchengetedza 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 musanganiswa dhaka zvinosanganisira huwandu hweMC yakawedzerwa, viscosity yeMC, kunaka kwezvikamu uye tembiricha yenzvimbo yekushandisa.
Zvinhu zve cellulose ethers zvinoenderana nerudzi, nhamba uye kugovera kwezvinotsiva.Kurongeka kwema cellulose ethers zvakare kwakavakirwa pamhando yezvinotsiva, dhigirii reetherification, solubility uye zvine chekuita nekushandisa zvivakwa.Zvinoenderana nemhando yezvinotsiva pane molecular cheni, inogona kukamurwa kuita monoether uye yakasanganiswa ether.Iyo MC yatinowanzo shandisa ndeye monoether, uye iyo HPMC yakasanganiswa ether.Methyl cellulose ether MC ndicho chigadzirwa mushure meboka re hydroxyl pane glucose unit ye natural cellulose inotsiviwa ne methoxy.Chimiro chechimiro ndechekuti [COH7O2(OH)3-h(OCH3)h ]x.Chimwe chikamu cheboka re hydroxyl pachikwata chinotsiviwa neboka re methoxy, uye chimwe chikamu chinotsiviwa neboka re hydroxypropyl, chimiro chechimiro chinonzi [C6H7O2 (OH) 3-mn (OCH3) m[OCH2CH (OH) CH3] n] x Ethyl methyl cellulose ether HEMC, aya ndiwo marudzi makuru anoshandiswa zvakanyanya uye anotengeswa mumusika.
Panyaya yekunyungudika, inogona kukamurwa kuita ionic uye isiri-ionic.Mvura inonyungudika isiri-ionic cellulose ethers inonyanya kuumbwa maviri akatevedzana ealkyl ethers uye hydroxyalkyl ethers.Ionic CMC inonyanya kushandiswa mukugadzira dhizaini, machira kudhinda uye dhayi, chikafu uye kuongorora mafuta.Non-ionic MC, HPMC, HEMC, nezvimwewo zvinonyanya kushandiswa mukuvaka zvinhu, latex coatings, mishonga, makemikari ezuva nezuva, etc. Inoshandiswa seyakasviba, mvura inochengetedza agent, stabilizer, dispersant uye film forming agent.
Kuchengetedzwa 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 kuita zvinhu zvitatu:
1. Yakanakisa kuchengetedza mvura
2. Mhedzisiro yedhaka kuwirirana uye thixotropy
3. Kudyidzana nesamende.
Kuchengetwa kwemvura kweselulosi ether kunoenderana nekutorwa kwemvura kwehwaro hwepasi, 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.
Nguva yekutumira: Zvita-06-2022