CMC nthawi zambiri imakhala ya anionic polima pawiri yokonzedwa ndikuchitapo kanthu pa cellulose yachilengedwe yokhala ndi caustic alkali ndi asidi monochloroacetic, yokhala ndi kulemera kwa 6400 (± 1 000).Zopangira zazikulu ndi sodium chloride ndi sodium glycolate.CMC ndi yachilengedwe kusinthidwa kwa cellulose.Zakhala zikutchedwa "modified cellulose" ndi Food and Agriculture Organization ya United Nations (FAO) ndi World Health Organization (WHO).
khalidwe
Zizindikiro zazikulu zoyezera mtundu wa CMC ndi digiri ya m'malo (DS) ndi chiyero.Kawirikawiri, katundu wa CMC ndi wosiyana pamene DS ndi yosiyana;kumtunda kwa mlingo woloweza m'malo, kusungunuka kwabwino, komanso kuwonekera bwino ndi kukhazikika kwa yankho.Malinga ndi malipoti, kuwonekera kwa CMC ndikwabwinoko pomwe kuchuluka kwa m'malo ndi 0.7-1.2, ndipo kukhuthala kwake kwamadzimadzi ndikokulirapo pomwe pH mtengo ndi 6-9.Pofuna kuonetsetsa ubwino wake, kuwonjezera pa kusankha etherifying wothandizila, zinthu zina zimakhudza mlingo wa m'malo ndi chiyero ayeneranso kuganizira, monga mlingo ubale pakati alkali ndi etherifying wothandizira, nthawi etherification, dongosolo madzi zili, kutentha. , pH mtengo, ndende ya yankho ndi mchere.
Kuwunika kwa ubwino ndi kuipa kwa sodium carboxymethyl cellulose
Kukula kwa sodium carboxymethyl cellulose sikunachitikepo.Makamaka m'zaka zaposachedwa, kukula kwa malo ogwiritsira ntchito komanso kuchepetsa ndalama zopangira zinthu kwapangitsa kuti kupanga carboxymethyl cellulose kuchuluke kwambiri.Zogulitsa zomwe zimagulitsidwa zimasakanizidwa.
Kenako, momwe tingadziwire mtundu wa sodium carboxymethyl cellulose, timasanthula kuchokera kuzinthu zina zakuthupi ndi zamankhwala:
Choyamba, chikhoza kusiyanitsa ndi kutentha kwake kwa carbonization.Kutentha kwakukulu kwa carbonization ya sodium carboxymethyl cellulose ndi 280-300 ° C. Pamene mpweya wa carbonized usanafike kutentha uku, ndiye kuti mankhwalawa amakhala ndi mavuto.(Nthawi zambiri carbonization imagwiritsa ntchito ng'anjo yamoto)
Kachiwiri, imasiyanitsidwa ndi kutentha kwake kosinthika.Nthawi zambiri, sodium carboxymethyl cellulose imasintha mtundu ikafika kutentha kwina.Kutentha kwapakati ndi 190-200 ° C.
Chachitatu, chikhoza kudziwika kuchokera ku maonekedwe ake.Maonekedwe azinthu zambiri ndi ufa woyera, ndipo kukula kwake kwa tinthu kumakhala 100 mauna, ndipo mwayi wodutsa ndi 98.5%.
Sodium carboxymethyl cellulose ndi chinthu chomwe chimagwiritsidwa ntchito kwambiri pa cellulose ndipo chimakhala ndi ntchito zosiyanasiyana, kotero pangakhale zotengera pamsika.Ndiye momwe mungadziwire ngati ndi chinthu chomwe chimafunidwa ndi ogwiritsa ntchito amatha kupitilira mayeso otsatirawa.
Sankhani 0.5g ya sodium carboxymethyl cellulose, yomwe siyikutsimikiza ngati idapangidwa ndi sodium carboxymethylcellulose, isungunuleni mu 50mL yamadzi ndikugwedeza, onjezerani pang'ono nthawi iliyonse, yambitsani 60 ~ 70 ℃, ndi kutentha kwa mphindi 20 pangani njira yothetsera yunifolomu, ozizira Pambuyo pozindikira madzi, mayesero otsatirawa anachitidwa.
1. Onjezani madzi mu njira yoyesera kuti asungunuke kasanu, onjezerani 0.5mL ya chromotropic acid test solution padontho limodzi lake, ndikutenthetsa mu osamba m'madzi kwa mphindi 10 kuti ziwoneke zofiirira.
2. Onjezani 10 mL ya acetone ku 5 mL ya njira yoyesera, gwedezani ndi kusakaniza bwino kuti mutulutse chiwombankhanga choyera.
3. Onjezani 1mL ya ketone sulfate test solution ku 5mL ya test solution, sakanizani ndi kugwedeza kuti mutulutse kuwala kwa blue flocculent precipitate.
4. Zotsalira zomwe zimapezedwa ndi phulusa la mankhwalawa zimasonyeza momwe mchere wa sodium umathandizira, ndiko kuti, sodium carboxymethyl cellulose.
Kudzera munjira izi, mutha kudziwa ngati chinthu chogulidwa ndi sodium carboxymethyl cellulose ndi chiyero chake, chomwe chimapereka njira yosavuta komanso yothandiza kwa ogwiritsa ntchito kusankha zinthu moyenera.
Nthawi yotumiza: Nov-12-2022