01. Abubuwan da ke cikin sodium carboxymethylcellulose
Sodium carboxymethyl cellulose ne anionic polymer electrolyte. Matsayin maye gurbin CMC na kasuwanci ya bambanta daga 0.4 zuwa 1.2. Dangane da tsabta, bayyanar fari ne ko fari-fari.
1. Dankowar maganin
Dankowar CMC mai ruwa mai ruwa yana ƙaruwa da sauri tare da haɓakar haɓakawa, kuma maganin yana da halaye masu gudana na pseudoplastic. Magani tare da ƙananan digiri na maye gurbin (DS=0.4-0.7) sau da yawa suna da thixotropy, kuma danko na fili zai canza lokacin da aka yi amfani da shear ko cirewa zuwa bayani. Dankowar maganin ruwa na CMC yana raguwa tare da ƙara yawan zafin jiki, kuma wannan tasirin yana canzawa lokacin da zafin jiki bai wuce 50 ° C ba. A mafi yawan zafin jiki na dogon lokaci, CMC zai ragu. Wannan shine dalilin da ya sa glaze na jini yana da sauƙi don juya fari da lalacewa lokacin buga layin layi na bakin ciki bleed glaze.
CMC da aka yi amfani da shi don glaze yakamata ya zaɓi samfur tare da babban matsayi na canji, musamman glaze na jini.
2. Sakamakon ƙimar pH akan CMC
Danko na CMC mai ruwa bayani ya kasance na al'ada a cikin kewayon pH mai fadi, kuma ya fi barga tsakanin pH 7 da 9. Tare da pH
Ƙimar ta ragu, kuma CMC ya juya daga nau'in gishiri zuwa nau'in acid, wanda ba shi da narkewa a cikin ruwa kuma yana hazo. Lokacin da ƙimar pH ta ƙasa da 4, yawancin nau'in gishiri ya juya zuwa siffar acid kuma yana haɓaka. Lokacin da pH ke ƙasa da 3, matakin maye gurbin bai wuce 0.5 ba, kuma yana iya canzawa gaba ɗaya daga nau'in gishiri zuwa nau'in acid. Ƙimar pH na cikakken canji na CMC tare da babban matsayi na maye gurbin (sama da 0.9) yana ƙasa da 1. Saboda haka, yi ƙoƙarin yin amfani da CMC tare da babban matsayi na maye gurbin glaze na seepage.
3. Dangantaka tsakanin CMC da ions karfe
Monovalent karfe ions iya samar da ruwa-soluble salts tare da CMC, wanda ba zai shafi danko, nuna gaskiya da sauran kaddarorin na ruwa bayani, amma Ag + ne banda, wanda zai sa da bayani to hazo. Divalent karfe ions, irin su Ba2+, Fe2+, Pb2+, Sn2+, da dai sauransu sa maganin hazo; Ca2+, Mg2+, Mn2+, da dai sauransu ba su da wani tasiri akan maganin. Ƙarfe na trivalent suna samar da gishiri maras narkewa tare da CMC, ko hazo ko gel, don haka ferric chloride ba za a iya kauri da CMC ba.
Akwai rashin tabbas a cikin tasirin haƙurin gishiri na CMC:
(1) Yana da alaƙa da nau'in gishiri na ƙarfe, ƙimar pH na maganin da matakin maye gurbin CMC;
(2) Yana da alaƙa da tsarin hadawa da hanyar CMC da gishiri.
CMC tare da babban matsayi na maye gurbin yana da mafi dacewa tare da gishiri, kuma sakamakon ƙara gishiri zuwa CMC bayani ya fi na ruwan gishiri.
CMC yayi kyau. Sabili da haka, lokacin shirya osmotic glaze, gabaɗaya narkar da CMC a cikin ruwa da farko, sannan ƙara maganin gishiri osmotic.
02. Yadda ake gane CMC a kasuwa
Rarrabe ta da tsarki
High-tsarki sa - abun ciki yana sama da 99.5%;
Matsayi mai tsabta na masana'antu - abun ciki yana sama da 96%;
Danyen samfurin - abun ciki yana sama da 65%.
Rarraba ta danko
Babban danko nau'in - 1% bayani danko yana sama da 5 Pa s;
Nau'in danko na matsakaici - danko na 2% bayani yana sama da 5 Pa s;
Nau'in ƙaramin ɗanƙoƙi - 2% dankowar bayani sama da 0.05 Pa·s.
03. Bayanin samfuran gama gari
Kowane masana'anta yana da nasa samfurin, an ce akwai nau'ikan sama da 500. Mafi yawan samfurin ya ƙunshi sassa uku: X—Y—Z.
Harafin farko yana wakiltar amfanin masana'antu:
F - darajar abinci;
I——jin masana'antu;
C - darajar yumbu;
O - darajar man fetur.
Harafi na biyu yana wakiltar matakin danko:
H - babban danko
M—— matsakaita danko
L - low danko.
Harafi na uku yana wakiltar matakin musanya, kuma adadinsa da aka raba da 10 shine ainihin matakin maye gurbin CMC.
Misali:
Samfurin CMC shine FH9, wanda ke nufin CMC tare da matakin abinci, babban danko da matakin maye gurbin 0.9.
Samfurin CMC shine CM6, wanda ke nufin CMC na yumbu, matsakaicin danko da matakin maye gurbin 0.6.
Hakazalika, akwai kuma maki da ake amfani da su a fannin likitanci, masaku da sauran masana'antu, waɗanda ba kasafai ake samun su ba wajen yin amfani da masana'antar yumbu.
04. Matsayin Zaɓin Masana'antar yumbura
1. Danko kwanciyar hankali
Wannan shine yanayin farko don zaɓar CMC don glaze
(1) Danko ba ya canzawa sosai a kowane lokaci
(2) Danko ba ya canzawa sosai tare da zafin jiki.
2. Ƙananan thixotropy
A cikin samar da fale-falen fale-falen glazed, slurry glaze ba zai iya zama thixotropic ba, in ba haka ba zai shafi ingancin glazed, don haka yana da kyau a zaɓi CMC-sa abinci. Don rage farashi, wasu masana'antun suna amfani da CMC na masana'antu, kuma ingancin glaze yana da sauƙin tasiri.
3. Kula da hanyar gwajin danko
(1) Mahimmancin CMC yana da alaƙa mai ma'ana tare da danko, don haka ya kamata a biya hankali ga daidaiton auna;
(2) Kula da daidaituwa na maganin CMC. Hanyar gwaji mai tsanani ita ce ta motsa maganin na tsawon sa'o'i 2 kafin auna danko;
(3) Zazzabi yana da tasiri mai girma akan danko, don haka ya kamata a kula da yanayin zafi a lokacin gwaji;
(4) Kula da adanar maganin CMC don hana lalacewarsa.
(5) Kula da bambanci tsakanin danko da daidaito.
Lokacin aikawa: Janairu-05-2023