Cellulose ether ni polymer yubukorikori ikozwe muri selile naturel binyuze muburyo bwo guhindura imiti. Cellulose ether ni inkomoko ya selile naturel. Umusaruro wa selulose ether uratandukanye na polymrike ya synthique. Ibikoresho byibanze byingenzi ni selile, ibinyabuzima bisanzwe bya polymer. Bitewe numwihariko wimiterere ya selile isanzwe, selile ubwayo ntabwo ifite ubushobozi bwo kubyitwaramo na etherification. Ariko, nyuma yo kuvura imiti yabyimbye, imiyoboro ikomeye ya hydrogène iri hagati yiminyururu ya molekile n'iminyururu irasenyuka, kandi kurekura gukomeye kwitsinda hydroxyl bihinduka selile ya alkali selile. Kubona selile ether.
Mubiteguye kuvanga minisiteri, ubwinshi bwa selile ya ether ya selile iri hasi cyane, ariko irashobora kunoza cyane imikorere ya minisiteri itose, kandi ninyongera nyamukuru igira ingaruka kumyubakire ya minisiteri. Guhitamo gushyira mu gaciro ethers ya selile yubwoko butandukanye, viscosities zitandukanye, ingano zingana zingana, dogere zitandukanye za viscosity hamwe n’amafaranga yongeweho bizagira ingaruka nziza kumikorere yimikorere ya poro yumye. Kugeza ubu, amabuye menshi yo kubumba no guhomeka afite imikorere idahwitse yo gufata amazi, kandi amazi yatandukanijwe nyuma yiminota mike ihagaze.
Kugumana amazi nigikorwa cyingenzi cya methyl selulose ether, kandi nigikorwa kandi benshi mubakora uruganda rwumye-ruvanze na minisiteri, cyane cyane abo mukarere ka majyepfo bafite ubushyuhe bwinshi, bitondera. Ibintu bigira ingaruka ku gufata amazi ya minisiteri yumye yumye harimo ingano ya MC yongeweho, ubwiza bwa MC, ubwiza bwibice hamwe nubushyuhe bwibidukikije.
Ibiranga selile ya selile biterwa n'ubwoko, umubare no gukwirakwiza insimburangingo. Itondekanya rya selile ya selile nayo ishingiye ku bwoko bwinsimburangingo, urwego rwa etherification, solubile hamwe nibisabwa bijyanye. Ukurikije ubwoko bwinsimburangingo kumurongo wa molekile, irashobora kugabanywamo monoether hamwe na ether ivanze. MC dusanzwe dukoresha ni imwe, kandi HPMC ivanze ether. Methyl selulose ether MC nigicuruzwa nyuma yitsinda rya hydroxyl kumurongo wa glucose ya selile ya selile isanzwe isimburwa na mikorerexy. Imiterere yuburyo ni [COH7O2 (OH) 3-h (OCH3) h] x. Igice cyitsinda rya hydroxyl kurigice gisimburwa nitsinda ryimikorere, naho ikindi gice gisimburwa nitsinda rya hydroxypropyl, formulaire yimiterere ni [C6H7O2 (OH) 3-mn (OCH3) m [OCH2CH (OH) CH3] n] x Ethyl methyl selulose ether HEMC, ubu ni ubwoko bwingenzi bukoreshwa kandi bugurishwa mumasoko yingenzi akoreshwa kandi agurishwa.
Kubijyanye no kwikemurira ibibazo, birashobora kugabanywamo ionic na non-ionic. Amazi ashonga adafite ionic selulose ethers agizwe ahanini nuruhererekane rwibintu bibiri bya alkyl ethers na hydroxyalkyl ethers. Ionic CMC ikoreshwa cyane cyane munganda zogukoresha, gucapa imyenda no gusiga irangi, ibiryo nubushakashatsi bwamavuta. MC idafite ionic MC, HPMC, HEMC, nibindi bikoreshwa cyane mubikoresho byubwubatsi, gutwikira latx, imiti, imiti ya buri munsi, nibindi bikoreshwa nkibibyimbye, bigumana amazi, stabilisateur, ikwirakwiza na firime ikora firime.
Kugumana amazi ya selile ether: Mu gukora ibikoresho byubaka, cyane cyane ifu yumye yumye, selulose ether igira uruhare rudasubirwaho, cyane cyane mugukora minisiteri idasanzwe (minisiteri yahinduwe), nikintu cyingenzi kandi cyingenzi. Uruhare rwingenzi rwamazi ya elegitoronike ya selireose muri minisiteri ifite ibintu bitatu:
1. Ubushobozi bwiza bwo gufata amazi
2. Ingaruka kumurongo wa minisiteri na thixotropy
3. Imikoranire na sima.
Ingaruka yo gufata amazi ya selile ya selile biterwa no kwinjiza amazi kurwego rwibanze, imiterere ya minisiteri, ubunini bwikigero cya minisiteri, amazi akenerwa na minisiteri, nigihe cyo kugenera ibikoresho. Kugumana amazi ya selile ether ubwayo bituruka kumashanyarazi no kubura umwuma wa selile ubwayo. Nkuko twese tubizi, nubwo urunigi rwa selile ya selile irimo umubare munini wamatsinda ya OH afite ingufu nyinshi, ntabwo ashonga mumazi, kuko imiterere ya selile ifite urwego rwo hejuru rwa kristu. Ubushobozi bwo kuyobora amatsinda ya hydroxyl yonyine ntibihagije kugirango uhuze imigozi ikomeye ya hydrogène nimbaraga za van der Waals hagati ya molekile. Kubwibyo, irabyimba gusa ariko ntishonga mumazi. Iyo insimburangingo yinjijwe mumurongo wa molekile, ntabwo insimburangingo yangiza urunigi rwa hydrogène gusa, ariko kandi isano ya hydrogène ihuza imiyoboro irasenywa bitewe no guhuza insimburangingo hagati yiminyururu yegeranye. Ninini isimbuye, niko intera iri hagati ya molekile. Intera nini. Ingaruka nini zo gusenya imigozi ya hydrogène, ether ya selulose ihinduka amazi-nyuma ya latulice ya selile yagutse kandi igisubizo kikinjira, kigakora igisubizo cyinshi cyane. Iyo ubushyuhe buzamutse, hydrated ya polymer igabanuka, kandi amazi ari hagati yiminyururu yirukanwa. Iyo ingaruka zo kubura umwuma zihagije, molekile zitangira kwegeranya, zikora imiterere-yimiterere-yimiterere-itatu igizwe na gel hanyuma ikazunguruka.
Igihe cyo kohereza: Ukuboza-06-2022