I-Cellulose idlala ikakhulukazi izindima ezintathu zokuqina, ukugcinwa kwamanzi kanye nokwakhiwa kodaka nopende.
Ukuqina: I-Cellulose ingajiywa ukuze imise futhi igcine umfaniswano wekhambi phezulu naphansi, futhi imelane nokuwohloka.
Ukugcina amanzi: yenza udaka nopende lome kancane, futhi usize izinto ezinjengomlotha ne-calcium ukuthi zisabele ngaphansi kokusebenza kwamanzi.
Ukwakhiwa: I-Cellulose inomphumela wokugcoba, ongenza ama-mortars nama-coatings abe nezakhiwo ezinhle zokwakha.
1. I-Methyl cellulose (MC)
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, ukucoleka kwezinhlayiyana 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 kuzothinta kakhulu izinga lokugcinwa kwamanzi e-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 cellulose inomthelela omkhulu ekusebenzeni nasekubambeleleni kodaka. Igama elithi “adhesion” lapha libhekisela emandleni okunamathela azwakala phakathi kwethuluzi lokufaka isicelo lesisebenzi kanye ne-substrate yodonga, okungukuthi, ukumelana ne-shear kodaka. I-adhesiveness iphakeme, ukumelana kwe-shear kodaka kukhulu, futhi amandla adingwa ngabasebenzi ngesikhathi sokusebenzisa nawo makhulu, futhi ukusebenza kokwakhiwa kodaka kumpofu. I-Methyl cellulose adhesion isezingeni elilinganiselwe emikhiqizweni ye-cellulose ether.
2. I-Hydroxypropylmethylcellulose (HPMC)
IHydroxypropyl methylcellulose iwuhlobo lwe-cellulose okukhishwa kwayo nokusetshenziswa kwayo kukhule ngokushesha eminyakeni yamuva. 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 zihlukile ngenxa yezilinganiso ezihlukene zokuqukethwe kwe-methoxyl nokuqukethwe 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, i-viscosity yayo ephezulu inomphumela ophansi wokushisa kune-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 methylcellulose izinzile ku-asidi ne-alkali, futhi isisombululo 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 ukubukeka kwayo. 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 engcono kune-methylcellulose, futhi kungenzeka ukuwohloka kwe-enzymatic yesisombululo sayo kungaphansi kwe-methylcellulose. Ukunamathela kwe-hydroxypropyl methylcellulose ekwakhiweni kodaka kungaphezulu kwalokho kwe-methylcellulose.
3. I-Hydroxyethyl cellulose (HEC)
Yenziwe ngokotini ocolisisiwe ophathwe nge-alkali, futhi isabela nge-ethylene oxide njenge-etherification ejenti lapho kukhona i-acetone. Izinga 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. 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 kuphansi kakhulu kunaleyo ye-methyl cellulose ngenxa yamanzi amaningi kanye nomlotha omningi.
4. I-Carboxymethyl cellulose (CMC)
Ionic cellulose ether yenziwe ngemicu yemvelo (ukotini, njll.) ngemva kokwelashwa nge-alkali futhi isetshenziswe njenge-etherification agent ngochungechunge 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, ilahlekelwa yi-viscosity.
(4) Ukugcinwa kwayo kwamanzi kuphansi kakhulu kunaleyo ye-methyl cellulose. Inomphumela wokuhlehlisa odakeni olususelwa ku-gypsum futhi inciphisa amandla ayo. Nokho, intengo ye-carboxymethyl cellulose iphansi kakhulu kunaleyo ye-methyl cellulose
Indima ye-hydroxypropyl methylcellulose embonini yokumboza: Ngenxa yokuthi i-HPMC inezinto ezifanayo kwamanye ama-ether ancibilikayo emanzini, ingasetshenziswa njenge-ejenti eyenza ifilimu, i-thickener, emulsifier kanye ne-stabilizer kumapende we-emulsion kanye nezingxenye zopende ezincibilika emanzini. i-ejenti, njll., ukuze ukugqoka kube nokumelana okuhle kokugqoka. Ukulinganisa nokunamathela, kanye nokungezwani okuthuthukisiwe kwendawo, ukuzinza ku-asidi ne-alkali, nokuhambisana nombala wensimbi. Ngenxa yokuthi iphoyinti lejeli le-HPMC liphakeme kunele-MC, ukumelana kwayo nokuguguleka kwebhaktheriya nakho kunamandla kunamanye ama-cellulose ethers, ngakho-ke ingasetshenziswa njengesishuqululi sikapende we-emulsion yamanzi. I-HPMC inokuqina okuhle kwesitoreji se-viscosity, futhi inokuhlakazeka okuhle kakhulu, ngakho-ke ifaneleka ikakhulukazi njengesihlakazeki kuma-emulsified coatings.
Isikhathi sokuthumela: Mar-04-2023