I-CMC ivame ukuba yi-anionic polymer compound elungiselelwe ngokuphendula i-cellulose yemvelo nge-caustic alkali kanye ne-monochloroacetic acid, enesisindo sama-molecule esingu-6400 (±1 000). Imikhiqizo eyinhloko engaphansi kwayo yi-sodium chloride kanye ne-sodium glycolate. I-CMC ingeye-natural cellulose modification. Ibizwa ngokusemthethweni ngokuthi “modified cellulose” yi-Food and Agriculture Organization ye-United Nations (FAO) kanye ne-World Health Organization (WHO).
ikhwalithi
Izinkomba eziyinhloko zokulinganisa ikhwalithi ye-CMC yizinga lokushintsha (DS) kanye nobumsulwa. Ngokuvamile, izakhiwo ze-CMC ziyahluka uma i-DS ihlukile; uma izinga lokushintsha liphakeme, kulapho ukuncibilika kuba ngcono khona, futhi kulapho ukucaca nokuzinza kwesisombululo kuba ngcono khona. Ngokusho kwemibiko, ukucaca kwe-CMC kungcono uma izinga lokushintsha lingu-0.7-1.2, kanti i-viscosity yesisombululo sayo samanzi inkulu kakhulu uma inani le-pH lingu-6-9. Ukuze kuqinisekiswe ikhwalithi yayo, ngaphezu kokukhetha i-etherifying agent, ezinye izici ezithinta izinga lokushintsha kanye nobumsulwa nazo kumele zicatshangelwe, njengobudlelwano bomthamo phakathi kwe-alkali ne-etherifying agent, isikhathi se-etherification, okuqukethwe kwamanzi ohlelweni, izinga lokushisa, inani le-pH, ukuhlushwa kwesisombululo kanye nosawoti.
Ukuhlaziywa kwezinzuzo kanye nokungalungi kwe-sodium carboxymethyl cellulose
Ukuthuthukiswa kwe-sodium carboxymethyl cellulose akukaze kwenzeke ngaphambili. Ikakhulukazi eminyakeni yamuva nje, ukwanda kwamasimu okusetshenziswa kanye nokunciphisa izindleko zokukhiqiza kwenze ukukhiqizwa kwe-carboxymethyl cellulose kwathandwa kakhulu. Imikhiqizo ethengiswayo ixubile.
Ngemuva kwalokho, indlela yokunquma ikhwalithi ye-sodium carboxymethyl cellulose, sihlaziya ngokwemibono ethile yomzimba neyamakhemikhali:
Okokuqala, ingahlukaniswa nokushisa kwayo kwe-carbonization. Izinga lokushisa elijwayelekile le-carbonization le-sodium carboxymethyl cellulose lingu-280-300 ° C. Uma i-carbonization ingakafinyelelwa kuleli zinga lokushisa, khona-ke lo mkhiqizo uba nezinkinga. (Ngokuvamile i-carbonization isebenzisa i-muffle furnace)
Okwesibili, ihlukaniswa ngokushisa kwayo okuguqukayo kombala. Ngokuvamile, i-sodium carboxymethyl cellulose izoshintsha umbala uma ifinyelela izinga lokushisa elithile. Ububanzi bokushisa bungu-190-200 °C.
Okwesithathu, ingabonakala ngokubukeka kwayo. Ukubonakala kwemikhiqizo eminingi kuyimpuphu emhlophe, kanti ubukhulu bezinhlayiya zayo ngokuvamile buyi-mesh eyi-100, futhi amathuba okudlula kuyo angama-98.5%.
I-Sodium carboxymethyl cellulose iwumkhiqizo we-cellulose osetshenziswa kakhulu futhi inezinhlobo eziningi zezicelo, ngakho-ke kungase kube nokulingisa emakethe. Ngakho-ke indlela yokubona ukuthi umkhiqizo odingwa abasebenzisi ingaphumelela ukuhlolwa okulandelayo kokuhlonza.
Khetha u-0.5g we-sodium carboxymethyl cellulose, ongaqiniseki ukuthi uwumkhiqizo we-sodium carboxymethylcellulose, uwuncibilikise ku-50mL wamanzi bese uvuselela, engeza inani elincane isikhathi ngasinye, uvuselele ku-60 ~ 70 ℃, bese ufudumeza imizuzu engama-20 ukuze wenze isixazululo esifanayo, uphole Ngemva kokutholwa koketshezi, kwenziwa izivivinyo ezilandelayo.
1. Faka amanzi esixazululweni sokuhlola ukuze unciphise izikhathi ezi-5, engeza u-0.5mL wesisombululo sokuhlola i-chromotropic acid econsini elilodwa laso, bese usishisa emanzini okugeza imizuzu eyi-10 ukuze sibonakale sibomvu ngokunsomi.
2. Faka i-10 mL ye-acetone ku-5 mL yesisombululo sokuhlola, shukumisa bese uxuba kahle ukuze ukhiqize i-flocculent precipitate emhlophe.
3. Engeza isixazululo sokuhlola se-ketone sulfate esingu-1mL kusisombululo sokuhlola esingu-5mL, hlanganisa bese ushukumisa ukuze ukhiqize i-flocculent precipitate eluhlaza okwesibhakabhaka.
4. Izinsalela ezitholakala ngokuthulula lo mkhiqizo zibonisa ukusabela okuvamile kosawoti we-sodium, okungukuthi, i-sodium carboxymethyl cellulose.
Ngalezi zinyathelo, ungabona ukuthi umkhiqizo othengiwe uyi-sodium carboxymethyl cellulose kanye nobumsulwa bawo, okunikeza indlela elula nesebenzayo yokuthi abasebenzisi bakhethe imikhiqizo ngendlela efanele.
Isikhathi sokuthunyelwe: Novemba-12-2022