I-cellulose etheriyinhlanganisela ye-polymer enesakhiwo se-ether esenziwe nge-cellulose. Indandatho ngayinye ye-glucosyl ku-cellulose macromolecule iqukethe amaqembu amathathu e-hydroxyl, iqembu eliyinhloko le-hydroxyl ku-athomu yesithupha yekhabhoni, iqembu le-hydroxyl lesibili kuma-athomu ekhabhoni lesibili nelesithathu, futhi i-hydrogen eqenjini le-hydroxyl ithathelwa indawo yiqembu le-hydrocarbon ukukhiqiza izinto eziphuma ku-cellulose ether. Kungumkhiqizo lapho i-hydrogen yeqembu le-hydroxyl ku-polymer cellulose ithathelwa indawo yiqembu le-hydrocarbon. I-Cellulose iyinhlanganisela ye-polyhydroxy polymer engancibiliki noma incibilike. Ngemuva kwe-etherification, i-cellulose iyancibilika emanzini, ixube isixazululo se-alkali kanye ne-organic solvent, futhi ine-thermoplasticity.
I-Cellulose iyinhlanganisela ye-polyhydroxy polymer engancibiliki noma incibilike. Ngemuva kwe-etherification, i-cellulose iyancibilika emanzini, ixube isixazululo se-alkali kanye ne-organic solvent, futhi ine-thermoplasticity.
1.Imvelo:
Ukunyibilika kwe-cellulose ngemva kwe-etherification kushintsha kakhulu. Ingancibilika emanzini, i-dilute acid, i-alkali ehlanjululwe noma i-organic solvent. I-solubility ikakhulukazi incike ezintweni ezintathu: (1) Izici zamaqembu ezethulwe enqubweni ye-etherification, eyethulwa Iqembu elikhulu, i-solubility ephansi, futhi inamandla kakhulu i-polarity yeqembu elethulwe, kulula kakhulu i-cellulose ether ukuncibilika emanzini; (2) Izinga lokushintshwa kanye nokusatshalaliswa kwamaqembu e-etherified ku-macromolecule. Ama-ether amaningi e-cellulose angancibilika kuphela emanzini ngaphansi kwezinga elithile lokushintsha, futhi izinga lokushintsha liphakathi kuka-0 no-3; (3) Izinga le-polymerization ye-cellulose ether, izinga eliphezulu le-polymerization, ukuncibilika kancane; Ukuncipha kwezinga lokushintsha elingancibilika emanzini, kuba banzi ububanzi. Kunezinhlobo eziningi zama-cellulose ethers asebenza kahle kakhulu, futhi asetshenziswa kakhulu ekwakheni, kusimende, ku-petroleum, ukudla, izindwangu, okokuhlanza, okokupenda, imithi, ukwenza amaphepha kanye nezingxenye ze-electronic nezinye izimboni.
2. Thuthukisa:
I-China ingumkhiqizi omkhulu emhlabeni wonke kanye nomthengi we-cellulose ether, enesilinganiso sokukhula sonyaka esingaphezu kwama-20%. Ngokwezibalo zokuqala, kunamabhizinisi okukhiqiza i-cellulose ether angaba ngu-50 eChina, amandla okukhiqiza aklanyelwe embonini ye-cellulose ether seyedlula amathani angu-400,000, futhi kukhona amabhizinisi angaba ngu-20 anamathani angaphezu kuka-10,000, asakazwa ikakhulukazi eShandong, eHebei, eChongqing naseJiangsu. , Zhejiang, Shanghai nezinye izindawo.
3. Isidingo:
Ngo-2011, amandla okukhiqiza e-CMC yaseChina ayengamathani angaba ngu-300,000. Ngokukhula kwesidingo sama-cellulose ether ekhwalithi ephezulu ezimbonini ezifana nemithi, ukudla, namakhemikhali ansuku zonke, isidingo sasekhaya seminye imikhiqizo ye-cellulose ether ngaphandle kwe-CMC siyakhula. , amandla okukhiqiza e-MC/HPMC angaba amathani angu-120,000, kanti awe-HEC angaba amathani angu-20,000. I-PAC isesigabeni sokuphromotha kanye nesicelo e-China. Ngokuthuthukiswa kwamasimu amakhulu kawoyela aphesheya kwezilwandle kanye nokuthuthukiswa kwezinto zokwakha, ukudla, amakhemikhali nezinye izimboni, inani kanye nensimu yePAC kuyanda futhi kwanda unyaka nonyaka, namandla okukhiqiza angaphezu kwamathani ayi-10,000.
4. Ukuhlelwa:
Ngokuya ngesigaba sesakhiwo samakhemikhali sezinto ezihlukile, zingahlukaniswa zibe ama-anionic, cationic kanye nama-nonionic ether. Ngokuya nge-ejenti ye-etherification esetshenzisiwe, kukhona i-methyl cellulose, i-hydroxyethyl methyl cellulose, i-carboxymethyl cellulose, i-ethyl cellulose, i-benzyl cellulose, i-hydroxyethyl cellulose, i-hydroxypropyl methyl cellulose cellulose, i-cyanoethyl cellulose, i-benzyl cyanoethyl carulose cellulose i-cellulose, njll. I-Methyl cellulose ne-ethyl cellulose zisebenza kakhulu.
I-Methylcellulose:
Ngemuva kokuthi ukotini ocolisisiwe ulashwe nge-alkali, i-cellulose ether ikhiqizwa ngochungechunge lokusabela nge-methane chloride njenge-etherification agent. Ngokuvamile, izinga lokushintsha lingu-1.6~2.0, futhi ukunyibilika nakho kuhlukile ngamazinga ahlukene okushintsha. Kungokwe-non-ionic cellulose ether.
(1) I-methylcellulose iyancibilika emanzini abandayo, futhi kuyoba nzima ukuyincibilika emanzini ashisayo. Isixazululo saso esinamanzi sizinzile kakhulu ebangeni le-pH=3~12. Inokuhambisana okuhle nesitashi, i-guar gum, njll. kanye nama-surfactants amaningi. Lapho izinga lokushisa lifinyelela izinga lokushisa le-gelation, i-gelation iyenzeka.
(2) Ukugcinwa kwamanzi kwe-methyl cellulose kuncike enanini layo elingeziwe, i-viscosity, usayizi wezinhlayiyana nezinga lokuqedwa. Ngokuvamile, uma inani elingeziwe likhulu, ukucoleka kuncane, futhi i-viscosity inkulu, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwazo, inani lokwengeza linomthelela omkhulu kakhulu ekugcinweni kwamanzi, futhi izinga le-viscosity alilingani ngokuqondile nezinga lokugcinwa kwamanzi. Izinga lokuhlakazeka lincike kakhulu ezingeni lokuguqulwa kwendawo yezinhlayiya ze-cellulose kanye nokucoleka kwezinhlayiyana. Phakathi kwama-cellulose ether angenhla, i-methyl cellulose ne-hydroxypropyl methyl cellulose anamazinga aphezulu okugcina amanzi.
(3) Ukushintsha kwezinga lokushisa kungathinta kakhulu ukugcinwa kwamanzi kwe-methyl cellulose. Ngokuvamile, lapho izinga lokushisa liphezulu, kuba kubi nakakhulu ukugcinwa kwamanzi. Uma izinga lokushisa lodaka lidlula i-40 ° C, ukugcinwa kwamanzi kwe-methyl cellulose kuzoncishiswa kakhulu, okuthinta kakhulu ukwakhiwa kodaka.
(4)I-Methyl cellulosekunomthelela omkhulu ekusebenzeni nasekuhlanganeni kodaka. “Ukunamathela” lapha kubhekisela kumandla okubopha azwakala phakathi kwethuluzi lesisebenzi lesifakeli kanye nengxenye yodonga, okungukuthi, ukumelana nokugunda kodaka. I-adhesiveness iphakeme, ukumelana kwe-shear kodaka kukhulu, futhi amandla adingwa ngabasebenzi ngesikhathi sokusebenzisa nawo makhulu, futhi ukusebenza kokwakhiwa kodaka kumpofu. Ukuhlangana kwe-methyl cellulose kusezingeni eliphakathi emikhiqizweni ye-cellulose ether.
I-Hydroxypropylmethylcellulose:
I-Hydroxypropyl methylcellulose iwuhlobo lwe-cellulose okukhipha kanye nokusetshenziswa kwalo kukhuphuka ngokushesha. I-ether engeyona i-ionic cellulose exutshwe ukotini ocolisisiwe ngemva kokwenziwa kwe-alkalization, kusetshenziswa i-propylene oxide ne-methyl chloride njenge-etherification agent, ngochungechunge lokusabela. Izinga lokushintsha ngokuvamile liyi-1.2 ~ 2.0. Izakhiwo zayo ziyahlukahluka kuye ngesilinganiso sokuqukethwe kwe-methoxyl kokuqukethwe kwe-hydroxypropyl.
(1) IHydroxypropyl methylcellulose incibilika kalula emanzini abandayo, futhi izohlangabezana nobunzima ekuncibilikeni emanzini ashisayo. Kodwa izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo le-methyl cellulose. I-solubility emanzini abandayo nayo ithuthuke kakhulu uma iqhathaniswa ne-methyl cellulose.
(2) I-viscosity ye-hydroxypropyl methylcellulose ihlobene nesisindo sayo samangqamuzana, futhi uma sikhulu isisindo samangqamuzana, i-viscosity iphakama. Ukushisa nakho kuthinta i-viscosity yayo, njengoba izinga lokushisa likhuphuka, i-viscosity iyancipha. Kodwa-ke, ithonya le-viscosity yayo ephezulu kanye nezinga lokushisa liphansi kunalelo le-methyl cellulose. Isixazululo saso sizinzile uma sigcinwe ekamelweni lokushisa.
(3) Ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose kuncike enanini layo elingeziwe, i-viscosity, njll., futhi izinga layo lokugcinwa kwamanzi ngaphansi kwenani elifanayo lokwengezwa lingaphezulu kwele-methyl cellulose.
(4)I-Hydroxypropyl methylcelluloseizinzile ku-asidi ne-alkali, futhi isixazululo sayo esinamanzi sizinzile kakhulu ebangeni le-pH=2~12. I-Caustic soda namanzi e-lime anethonya elincane ekusebenzeni kwawo, kodwa i-alkali ingasheshisa ukuchithwa kwayo futhi ikhulise kancane i-viscosity yayo. IHydroxypropyl methylcellulose izinzile kusawoti ovamile, kodwa lapho ukuhlangana kwesixazululo sikasawoti kuphezulu, i-viscosity ye-hydroxypropyl methylcellulose solution ivame ukwanda.
(5) I-Hydroxypropyl methylcellulose ingaxutshwa nezinhlanganisela ze-polymer ezincibilika emanzini ukuze zenze isixazululo se-uniform kanye ne-viscosity ephakeme. Okufana ne-polyvinyl alcohol, isitashi ether, ushingamu wemifino, njll.
(6) I-Hydroxypropyl methylcellulose inokumelana ne-enzyme okungcono kune-methylcellulose, futhi isisombululo sayo mancane amathuba okuthi sonakaliswe ama-enzyme kune-methylcellulose.
(7) Ukunamathela kwe-hydroxypropyl methylcellulose ekwakhiweni kodaka kungaphezulu kwalokho kwe-methylcellulose.
I-Hydroxyethyl cellulose:
Yenziwe kusukela kukotini ocolile ophathwe nge-alkali, futhi isabela nge-ethylene oxide njenge-etherification agent phambi kwe-isopropanol. Izinga layo lokushintsha ngokuvamile liyi-1.5 ~ 2.0. Ine-hydrophilicity eqinile futhi kulula ukumunca umswakama.
(1) I-Hydroxyethyl cellulose iyancibilika emanzini abandayo, kodwa kunzima ukuyincibilika emanzini ashisayo. Isixazululo saso sizinzile ekushiseni okuphezulu ngaphandle kwe-gelling. Ingasetshenziswa isikhathi eside ngaphansi kokushisa okuphezulu odakeni, kodwa ukugcinwa kwayo kwamanzi kuphansi kunaleyo ye-methyl cellulose.
(2) I-Hydroxyethyl cellulose izinzile ku-asidi evamile kanye ne-alkali, futhi i-alkali ingasheshisa ukuqedwa kwayo futhi ikhulise kancane i-viscosity yayo. Ukuhlakazeka kwayo emanzini kubi kakhulu kunaleyo ye-methyl cellulose ne-hydroxypropyl methyl cellulose.
(3) I-Hydroxyethyl cellulose inokusebenza okuhle kwe-anti-sag kudaka, kodwa inesikhathi eside sokuhlehlisa usimende.
(4) Ukusebenza kwe-hydroxyethyl cellulose ekhiqizwa amanye amabhizinisi asekhaya ngokusobala kuphansi kunaleyo ye-methyl cellulose ngenxa yokuqukethwe kwayo okuphezulu kwamanzi kanye nomlotha omningi.
(5) Isikhutha sesisombululo esinamanzi se-hydroxyethyl cellulose sibucayi kakhulu. Emazingeni okushisa angaba ngu-40 ° C, isikhutha singenzeka phakathi kwezinsuku ezi-3 kuya kwezingu-5, okuzothinta ukusebenza kwayo.
I-Carboxymethyl cellulose:
I-Lonic cellulose ether yenziwa ngemicu yemvelo (ukotini, njll.) ngemva kokwelashwa kwe-alkali, kusetshenziswa i-sodium monochloroacetate njenge-etherification agent, futhi yenze uchungechunge lwemithi yokwelapha. Izinga lokushintsha ngokuvamile lingu-0.4~1.4, futhi ukusebenza kwakho kuthintwa kakhulu izinga lokushintsha.
(1) I-Carboxymethyl cellulose ine-hygroscopic, futhi izoqukatha amanzi amaningi uma igcinwe ngaphansi kwezimo ezijwayelekile.
(2) Isixazululo samanzi se-Carboxymethyl cellulose asikhiqizi ijeli, futhi i-viscosity iyancipha ngokunyuka kwezinga lokushisa. Lapho izinga lokushisa lidlula ku-50°C, i-viscosity ayinakubuyela emuva.
(3) Ukuzinza kwayo kuthinteka kakhulu i-pH. Ngokuvamile, ingasetshenziswa odakeni olusekelwe ku-gypsum, kodwa hhayi odakeni olusekelwe kusimende. Uma kune-alkaline kakhulu, izolahlekelwa yi-viscosity.
(4) Ukugcinwa kwawo kwamanzi kuphansi kakhulu kune-methyl cellulose. Inomphumela wokuhlehlisa odakeni olususelwa ku-gypsum futhi inciphisa amandla ayo. Nokho, intengo ye-carboxymethyl cellulose iphansi kakhulu kunaleyo ye-methyl cellulose.
I-Cellulose Alkyl Ether:
Abamele i-methyl cellulose ne-ethyl cellulose. Emkhiqizweni wezimboni, i-methyl chloride noma i-ethyl chloride ivame ukusetshenziswa njenge-etherification agent, futhi ukusabela kungokulandelayo:
Kufomula, u-R umele i-CH3 noma i-C2H5. Ukugxila kwe-alkali akuthinti kuphela izinga le-etherification, kodwa futhi kuthinta ukusetshenziswa kwe-alkyl halides. Ukuncipha kokuhlushwa kwe-alkali, kuqina i-hydrolysis ye-alkyl halide. Ukuze kuncishiswe ukusetshenziswa kwe-etherifying ejenti, ukuhlushwa kwe-alkali kufanele kwandiswe. Kodwa-ke, uma ukugxiliswa kwe-alkali kuphezulu kakhulu, umphumela wokuvuvukala we-cellulose uyancishiswa, ongahambisani nokusabela kwe-etherification, futhi izinga le-etherification liyancishiswa. Ngale njongo, i-lye egxilile noma i-lye eqinile ingangezwa ngesikhathi sokuphendula. I-reactor kufanele ibe nesisetshenziswa esihle sokunyakazisa nokuklebhula ukuze i-alkali isabalaliswe ngokulinganayo. I-Methyl cellulose isetshenziswa kabanzi njenge-thickener, i-adhesive kanye ne-colloid evikelayo njll. Ingasetshenziswa futhi njenge-disperant ye-emulsion polymerization, i-bonding dispersant yembewu, i-textile slurry, isithasiselo sokudla nezimonyo, i-adhesive yezokwelapha, into yokumboza izidakamizwa, futhi isetshenziswe ekupendeni kwe-latex kupende, ukunyathelisa nokwandisa isikhathi sokukhiqiza, ukunyathelisa nokwandisa isikhathi sokukhiqiza. amandla okuqala, njll. Imikhiqizo ye-Ethyl cellulose inamandla amakhulu emishini, ukuguquguquka, ukumelana nokushisa nokumelana nokubanda. I-ethyl cellulose efakwe endaweni ephansi iyancibilika emanzini futhi ixube izixazululo ze-alkaline, futhi imikhiqizo efakwe endaweni ephezulu iyancibilika kuzincibilikisi eziningi eziphilayo. Inokuhambisana okuhle nama-resin ahlukahlukene kanye nama-plasticizers. Ingasetshenziselwa ukwenza amapulasitiki, amafilimu, ama-varnishes, ama-adhesives, i-latex nezinto zokumboza zezidakamizwa, njll. Ukwethulwa kwamaqembu e-hydroxyalkyl ku-cellulose alkyl ethers kungathuthukisa ukuncibilika kwayo, kunciphise ukuzwela kwayo ekukhipheni usawoti, kukhuphule izinga lokushisa kwe-gelation futhi kuthuthukise izakhiwo ezincibilikayo ezishisayo, njll. amaqembu e-hydroxyalkyl.
I-Cellulose Hydroxyalkyl Ether:
Abamele i-hydroxyethyl cellulose ne-hydroxypropyl cellulose. Ama-etherifying agents angama-epoxides afana ne-ethylene oxide ne-propylene oxide. Sebenzisa i-asidi noma isisekelo njenge-catalyst. Ukukhiqizwa kwemboni ukusabela i-alkali cellulose ne-etherification agent:i-hydroxyethyl celluloseenenani eliphakeme esikhundleni liyancibilika kokubili emanzini abandayo nasemanzini ashisayo. I-Hydroxypropyl cellulose enenani eliphezulu lokushintsha incibilika kuphela emanzini abandayo kodwa hhayi emanzini ashisayo. I-Hydroxyethyl cellulose ingasetshenziswa njenge-thickener yokugqoka i-latex, ukuphrinta kwendwangu nokunamathisela okudayayo, izinto zokulinganisa iphepha, izinto zokunamathisela kanye nama-colloid okuzivikela. Ukusetshenziswa kwe-hydroxypropyl cellulose kufana nokusetshenziswa kwe-hydroxyethyl cellulose. I-Hydroxypropyl cellulose enenani eliphansi lokushintsha ingasetshenziswa njengesamukeli semithi, esingaba nakho kokubili okubophayo nokuhlakazekayo.
I-Carboxymethyl cellulose, isifinyezo sesiNgisi esithi CMC, ngokuvamile sitholakala ngesimo sikasawoti we-sodium. I-ejenti etherifying yi-monochloroacetic acid, futhi ukusabela imi kanje:
I-Carboxymethyl cellulose isetshenziswa kakhulu kunazo zonke i-cellulose ether encibilika emanzini. Esikhathini esidlule, yayisetshenziswa ngokuyinhloko njengodaka lokumba, kodwa manje iye yanwetshwa ukuze isetshenziswe njengesengezo se-detergent, i-slurry yezingubo, upende we-latex, ukugcoba amakhadibhodi kanye nephepha, njll. I-carboxymethyl cellulose ehlanzekile ingasetshenziswa ekudleni, emithini, izimonyo, futhi njenge-adhesive ye-ceramics kanye nesikhunta.
I-Polyanionic cellulose (PAC) i-ionic cellulose ether futhi iwumkhiqizo othatha indawo ephezulu we-carboxymethyl cellulose (CMC). Kuyimpushana emhlophe, emhlophe noma ephuzi kancane noma i-granule, engenabuthi, ayinambitheki, kulula ukuyincibilika emanzini ukuze kwakheke isixazululo esisobala esine-viscosity ethile, inokuqina okungcono kokumelana nokushisa nokumelana nosawoti, kanye nezakhiwo eziqinile zokulwa namagciwane. Asikho isikhutha nokuwohloka. Inezici zokuhlanzeka okuphezulu, izinga eliphezulu lokushintshwa, kanye nokusatshalaliswa okufanayo kwama-substitute. Ingasetshenziswa njenge-binder, thickener, rheology modifier, i-fluid loss reducer, i-suspension stabilizer, njll. I-Polyanionic cellulose (PAC) isetshenziswa kabanzi kuzo zonke izimboni lapho i-CMC ingasetshenziswa khona, enganciphisa kakhulu umthamo, isebenzise kalula, inikeze ukuzinza okungcono futhi ihlangabezane nezidingo zenqubo ephakeme.
I-Cyanoethyl cellulose ingumkhiqizo wokusabela we-cellulose ne-acrylonitrile ngaphansi kwe-catalysis ye-alkali.
I-Cyanoethyl cellulose ine-dielectric ephezulu engaguquki kanye ne-coefficient yokulahlekelwa okuphansi futhi ingasetshenziswa njenge-resin matrix yamalambu e-phosphor kanye ne-electroluminescent. I-cyanoethyl cellulose efakwe endaweni ephansi ingasetshenziswa njengephepha lokuvikela ama-transformer.
Ama-ether e-alcohol anamafutha aphezulu, ama-alkenyl ether, nama-ether e-alcohol anuka kamnandi e-cellulose alungisiwe, kodwa awakaze asetshenziswe.
Izindlela zokulungiselela ze-cellulose ether zingahlukaniswa ngendlela ephakathi kwamanzi, indlela yokuncibilikisa, indlela yokuxova, indlela ye-slurry, indlela ye-gas-solid, indlela yesigaba se-liquid kanye nenhlanganisela yalezi zindlela ezingenhla.
5. Umgomo wokulungiselela:
I-pulp ephezulu ye-α-cellulose icwiliswe ngesisombululo se-alkaline ukuze ivuvuke ukuze ibhubhise amabhondi e-hydrogen engeziwe, yenze kube lula ukusakazeka kwama-reagents futhi ikhiqize i-alkali cellulose, bese isabela nge-etherification agent ukuze kutholwe i-cellulose ether. Ama-etherifying agents ahlanganisa i-hydrocarbon halides (noma ama-sulfate), ama-epoxides, kanye nenhlanganisela engu-α kanye ne-β unsaturated enama-electron amukela.
6. Ukusebenza okuyisisekelo:
Ama-Admixtures adlala indima ebalulekile ekuthuthukiseni ukusebenza kokwakhiwa kodaka oluxutshwe okomile, futhi akhokhela ngaphezu kuka-40% wezindleko zempahla kudaka oluxutshwe okomile. Ingxenye enkulu yengxube emakethe yasekhaya ihlinzekwa ngabakhiqizi bangaphandle, futhi umthamo owunkomba womkhiqizo unikezwa umphakeli. Ngenxa yalokho, izindleko zemikhiqizo yodaka oluxutshwe okomile zihlala ziphezulu, futhi kunzima ukwazisa ama-masonry avamile kanye nama-plastering mortars ngenani elikhulu kanye nobubanzi obubanzi. Imikhiqizo yezimakethe ezisezingeni eliphezulu ilawulwa izinkampani zakwamanye amazwe, futhi abakhiqizi bakadaka oluxutshwe okomile banenzuzo ephansi kanye nokungabizi kahle kwentengo; ukusetshenziswa kwezingxube akunalo ucwaningo oluhlelekile noluqondisiwe, futhi lulandela ngokungaboni amafomula angaphandle.
I-ejenti egcina amanzi iyinhlanganisela eyinhloko yokuthuthukisa ukusebenza kokugcinwa kwamanzi kodaka oluxutshwe okomile, futhi ingenye yezixube ezibalulekile ukuze kutholwe izindleko zodaka oluxutshwe okomile. Umsebenzi oyinhloko we-cellulose ether ukugcina amanzi.
I-Cellulose ether yitemu elivamile lochungechunge lwemikhiqizo ekhiqizwa ukusabela kwe-alkali cellulose kanye ne-etherifying agent ngaphansi kwezimo ezithile. I-alkali cellulose ithathelwa indawo ama-etherifying ahlukene ukuze kutholwe ama-cellulose ether ahlukene. Ngokuya ngezici ze-ionization zama-substituents, ama-cellulose ether angahlukaniswa abe izigaba ezimbili: i-ionic (njenge-carboxymethyl cellulose) kanye ne-nonionic (njenge-methyl cellulose). Ngokohlobo lwe-substituent, i-cellulose ether ingahlukaniswa ibe i-monoether (efana ne-methyl cellulose) ne-ether exutshiwe (njenge-hydroxypropyl methyl cellulose). Ngokuvumelana ne-solubility ehlukene, ingahlukaniswa ibe ukunyibilika kwamanzi (okufana ne-hydroxyethyl cellulose) kanye ne-organic solvent solubility (njenge-ethyl cellulose). Udaka oluxutshwe okomile ngokuyinhloko luyi-cellulose encibilika emanzini, futhi i-cellulose encibilika emanzini ihlukaniswe yaba uhlobo olusheshayo kanye nohlobo lokulibaziseka lokuncibilika olulashwe phezulu.
Indlela yokusebenza ye-cellulose ether odakeni imi kanje:
(1) Ngemuva kwe-i-cellulose etherodakeni luncibilika emanzini, ukusatshalaliswa okusebenzayo nokufana okufanayo kwezinto zikasimende ohlelweni kuqinisekiswa ngenxa yomsebenzi ongaphezulu, futhi i-cellulose ether, njenge-colloid evikelayo, "igoqa" izinhlayiya eziqinile kanye nongqimba lwefilimu yokugcoba kwakheka endaweni yalo yangaphandle, okwenza uhlelo lodaka luzinze kakhudlwana, futhi futhi luthuthukisa inqubo yokwakhiwa kwe-fluidity ngesikhathi sokwakhiwa okubushelelezi.
(2) Ngenxa yesakhiwo sawo samangqamuzana, isixazululo se-cellulose ether senza umswakama osesimendeni ungabi lula ukulahlekelwa, futhi kancane kancane uyawukhulula phakathi nesikhathi eside, unikeze udaka ngokugcinwa kahle kwamanzi nokusebenza.
Isikhathi sokuthumela: Apr-28-2024