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.
Zvinhu zve cellulose ethers zvinoenderana nerudzi, nhamba uye kugovera kwezvinotsiva.Kurongeka kwe cellulose ethers zvakare kwakavakirwa pamhando yezvinotsiva, dhigirii reetherification, solubility uye zvine chekuita nekushandisa zvivakwa.Zvinoenderana nerudzi rwezvinotsiva pane molecular cheni, inogona kukamurwa kuita monoether uye yakasanganiswa ether.Isu tinowanzo shandisa mc se monoether, uye HPmc seyakasanganiswa ether.Methyl cellulose ether mc ndicho chigadzirwa mushure meboka rehydroxyl riri paglucose unit ye natural cellulose inotsiviwa neboka remethoxy.Icho chigadzirwa chinowanikwa nekutsiva chikamu cheboka rehydroxyl payuniti neboka remethoxy uye chimwe chikamu neboka rehydroxypropyl.Chimiro chechimiro ndeichi [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethyl methyl cellulose ether HEmc, aya ndiwo marudzi makuru anoshandiswa zvakanyanya uye anotengeswa pamusika.
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 detergents, 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.
Kuchengetwa kwemvura ye cellulose ether
Mukugadzirwa kwezvinhu zvekuvaka, kunyanya yakaoma-yakasanganiswa dhaka, cellulose ether inoita basa risingadzokerike, kunyanya mukugadzirwa kwedhaka rakakosha (modified mortar), 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.Zvinhu zvinokanganisa kuchengetwa kwemvura yedhaka zvinosanganisira viscosity ye cellulose ether, huwandu hwakawedzerwa, kunaka kwezvimedu uye tembiricha yekushandisa.
Iyo yakakwirira viscosity ye cellulose ether, zviri nani kuchengetedza mvura kuita, uye yakakwirira viscosity yemushonga wepolymer.Zvichienderana nehuremu hwemamorekuru (polymerization dhigirii) yepolymer, inotemerwawo nehurefu hwemaketani echimiro chemamorekuru uye chimiro checheni, uye kugoverwa kwemhando uye huwandu hwezvinotsiva zvinokanganisawo zvakananga chiyero chayo che viscosity.[η]=Kmα
[η] Intrinsic viscosity yepolymer solution
m polymer molecular uremu
α polymer maitiro anogara aripo
K viscosity solution coefficient
Iyo viscosity yemushonga wepolymer zvinoenderana nehuremu hwema molecular epolymer.Iyo viscosity uye kusangana kwe cellulose ether mhinduro ine hukama nekushandiswa munzvimbo dzakasiyana siyana.Nokudaro, imwe neimwe cellulose ether ine zvakawanda zvakasiyana-siyana zveviscosity tsanangudzo, uye kugadzirisa kwe viscosity kunonyanya kuonekwa nekuora kwe alkali cellulose, kureva, kuputika kwe cellulose molecular cheni.
Iyo yakawanda yakawanda ye cellulose ether yakawedzerwa kune dhaka, zviri nani kuchengetedza kwemvura kushanda, uye yakakwirira viscosity, zviri nani kuchengetedza mvura kushanda.
Pakukura kwechidimbu, iyo yakatsetseka chidimbu, zviri nani kuchengetedza mvura (ona Mufananidzo 3).Mushure mekunge zvimedu zvakakura zve cellulose ether zvasangana nemvura, nzvimbo yacho inonyungudika pakarepo uye inoita gel yekuputira zvinhu kudzivirira mamorekuru emvura kuti arambe achipinda.Dzimwe nguva haigone kuparadzirwa zvakafanana uye kunyungudutswa kunyangwe mushure menguva refu yekubvongodza, ichigadzira cloudy flocculent solution kana agglomeration.Inobata zvakanyanya kuchengetwa kwemvura ye cellulose ether, uye solubility chimwe chezvinhu zvekusarudza cellulose ether.
Thickening uye Thixotropy yeCellulose Ether
Basa rechipiri re cellulose ether - thickening inobva pane: dhigirii yepolymerization ye cellulose ether, kugadziriswa kwekugadzirisa, 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 mc uye HPmc ine yakaderera viscosity, 10% -15% yekugadzirisa mhinduro inogona kugadzirirwa, 5% -10% mhinduro inogona kugadzirirwa yepakati viscosity mc uye HPmc, uye 2% -3% mhinduro inogona kugadzirirwa yakakwirira viscosity mc uye HPmc, uye kazhinji The 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 gelation concentration yeHPmc yakakwira pane tembiricha yekamuri.
Consistency inogonawo kugadziriswa nekusarudza particle size uye kusarudza cellulose ethers ane madhigirii akasiyana ekugadzirisa.Iyo inonzi shanduko ndeye kuunza imwe dhigirii yekutsiva ye hydroxyalkyl mapoka pane skeleton chimiro chemc.Nekushandura hukama hwekutsinhanisa hunhu hwevaviri vanotsiva, kureva, iyo DS uye ms hama inotsiviwa tsika dzemethoxy uye hydroxyalkyl mapoka atinowanzo kutaura.Zvido zvakasiyana-siyana zvekushanda zve cellulose ether zvinogona kuwanikwa kuburikidza nekushandura hukama hunotsiviwa hwezviviri zvinotsiva.
Cellulose ethers inoshandiswa muupfu zvivakwa zvekuvaka inofanirwa kunyungudika nekukurumidza mumvura inotonhora uye inopa kuenderana kwakakodzera kwehurongwa.Kana yakapihwa imwe shear rate, inoramba ichivhurika uye colloidal block, iri pasi pemhando kana yakashata mhando chigadzirwa.
Kune zvakare hukama hwakanaka hwemutsara pakati pekuenderana kwesamende paste uye dosi ye cellulose ether.Cellulose ether inogona kuwedzera zvakanyanya viscosity yedhaka.Iyo yakakura dosage, iyo inonyanya kujeka mhedzisiro, ona Mufananidzo 6
High-viscosity cellulose ether aqueous solution ine high thixotropy, iyo iriwo hunhu hukuru hwe cellulose ether.Aqueous mhinduro dzeMc-mhando mapolymers anowanzo ane pseudoplastic uye asiri-thixotropic fluidity pazasi petembiricha yavo yegel, asi Newtonian inoyerera zvivakwa pazasi shear mitengo.Pseudoplasticity inowedzera nehuremu hwemamorekuru kana kuungana kweselulosi ether, zvisinei nerudzi rwechinotsiva uye dhigirii rekutsiva.Naizvozvo, cellulose ethers yegiredhi rimwechete viscosity, hazvina mhosva mc, HPmc, HEmc, inogara ichiratidzira zvakafanana rheological properties chero bedzi kusungirirwa uye tembiricha zvichichengetwa.Magero ekugadzira anoumbwa kana tembiricha yakasimudzwa, uye yakanyanya thixotropic inoyerera inoitika.High concentration uye low viscosity cellulose ethers inoratidza thixotropy kunyange pasi pekushisa kwegel.Ichi chivakwa chinobatsira zvikuru kugadziridzwa kwemazinga uye kusagika mukuvaka dhaka rekuvaka.Zvinoda kutsanangurwa pano kuti kukwirisa viscosity ye cellulose ether, zviri nani kuchengetwa kwemvura, asi iyo yakakwira viscosity, iyo inokwira yakaenzana molecular uremu hwe cellulose ether, uye kuderera kunoenderana mukunyungudika kwayo, uko kune kukanganisa kwakashata. pamusoro pekugadzirisa kwedhaka uye kushanda kwekuvaka.Iyo yakakwirira viscosity, iyo inonyanya kuoneka iyo thickening maitiro padhaka, asi haina kuenzana zvachose.Imwe yepakati uye yakaderera viscosity, asi iyo yakagadziridzwa cellulose ether ine zvirinani kuita mukuvandudza simba rechimiro chedhaka rakanyorova.Nekuwedzera kwe viscosity, kuchengetwa kwemvura kwe cellulose ether kunovandudza.
Nguva yekutumira: Nov-22-2022