Kukhuthala kwa sodium carboxymethyl cellulose kumagawidwanso m'makalasi ambiri malinga ndi ntchito zosiyanasiyana. Kukhuthala kwa mtundu wotsuka ndi 10 ~ 70 (pansi pa 100), malire apamwamba a mamasukidwe akayendedwe amachokera ku 200 ~ 1200 pazokongoletsa zomanga ndi mafakitale ena, ndipo kukhuthala kwa kalasi yazakudya ndikokwera kwambiri. Onse ali pamwamba pa 1000, ndipo kukhuthala kwa mafakitale osiyanasiyana sikufanana.
Chifukwa cha kuchuluka kwa ntchito zake.
Kukhuthala kwa sodium carboxymethyl cellulose kumakhudzidwa ndi kuchuluka kwake kwa maselo, ndende, kutentha ndi pH mtengo, ndipo amasakanikirana ndi ethyl kapena carboxypropyl cellulose, gelatin, xanthan chingamu, carrageenan, dzombe chingamu, guar chingamu, agar, sodium alginate, pectin, chingamu arabic ndi wowuma ndi zotuluka zake zimagwirizana bwino (ie synergistic zotsatira).
Pamene pH mtengo ndi 7, kukhuthala kwa sodium carboxymethyl cellulose solution ndipamwamba kwambiri, ndipo pamene pH mtengo ndi 4 ~ 11, imakhala yokhazikika. Carboxymethylcellulose mu mawonekedwe a zitsulo zamchere ndi ammonium salt amasungunuka m'madzi. Divalent zitsulo ayoni Ca2+, Mg2+, Fe2+ zingakhudze mamasukidwe ake akayendedwe. Zitsulo zolemera monga siliva, barium, chromium kapena Fe3+ zimatha kupangitsa kuti iwonongeke. Ngati kuchuluka kwa ayoni kumayendetsedwa, monga kuwonjezera kwa chelating agent citric acid, njira yowonjezereka ya viscous imatha kupangidwa, zomwe zimapangitsa kuti pakhale chingamu chofewa kapena cholimba.
Sodium carboxymethyl cellulose ndi mtundu wa cellulose wachilengedwe, womwe nthawi zambiri umapangidwa ndi thonje la thonje kapena zamkati ngati zopangira ndipo umakhudzidwa ndi etherification ndi monochloroacetic acid pansi pamikhalidwe yamchere.
Malinga ndi zomwe zidapangidwa komanso kulowetsa hydroxyl hydrogen mu cellulose D-glucose unit ndi gulu la carboxymethyl, ma polima osungunuka m'madzi okhala ndi magawo osiyanasiyana olowa m'malo ndi magawo osiyanasiyana olemera a maselo amapezeka.
Chifukwa sodium carboxymethyl cellulose ili ndi mikhalidwe yambiri yapadera komanso yabwino kwambiri, imagwiritsidwa ntchito kwambiri m'makampani opanga mankhwala tsiku lililonse, chakudya ndi mankhwala komanso kupanga mafakitale ena.
Chimodzi mwa zizindikiro zofunika kwambiri za sodium carboxymethyl cellulose ndi kukhuthala kwa sodium carboxymethyl cellulose. Mtengo wa viscosity umagwirizana ndi zinthu zosiyanasiyana monga ndende, kutentha ndi kumeta ubweya. Komabe, zinthu monga ndende, kutentha ndi kumeta ubweya ndizo zinthu zakunja zomwe zimakhudza kukhuthala kwa sodium carboxymethyl cellulose.
Kulemera kwake kwa maselo ndi kugawa kwa maselo ndizinthu zamkati zomwe zimakhudza kukhuthala kwa sodium carboxymethyl cellulose solution. Pakuwongolera kupanga ndi kakulidwe kazinthu za sodium carboxymethyl cellulose, kufufuza kulemera kwake kwa maselo ndi kugawa kwake kwa maselo kuli ndi phindu lofunikira kwambiri, pomwe kukhuthala kwake kumangogwira ntchito inayake.
Malamulo a Newton mu rheology, chonde werengani zofunikira za "rheology" mu chemistry yakuthupi, ndizovuta kufotokoza mu chiganizo chimodzi kapena ziwiri. Ngati mukuyenera kunena izi: njira yochepetsera ya cmc pafupi ndi madzi a Newtonian, kupsinjika kwa kukameta ubweya kumagwirizana ndi kuchuluka kwa m'mphepete mwake, ndipo gawo lolingana pakati pawo limatchedwa viscosity coefficient kapena kinematic viscosity.
Viscosity imachokera ku mphamvu pakati pa ma cellulose ma cellulose, kuphatikiza mphamvu zobalalika ndi ma hydrogen bond. Makamaka, polymerization ya cellulose zotumphukira si liniya dongosolo koma Mipikisano nthambi dongosolo. Mu yankho, ma cellulose ambiri okhala ndi nthambi zambiri amalumikizidwa kuti apange mawonekedwe a network. Kapangidwe kameneka kamakhala kokulirapo, kumapangitsanso mphamvu zambiri pakati pa maunyolo a molekyulu muzotsatira zake.
Kupanga otaya mu kuchepetsa njira ya zotumphukira mapadi, mphamvu pakati pa maselo unyolo ayenera kugonjetsedwa, kotero yankho ndi mkulu mlingo wa polymerization amafuna mphamvu yaikulu kupanga otaya. Pakuyezetsa mamasukidwe akayendedwe, mphamvu pa yankho la CMC ndi mphamvu yokoka. Pansi pa mphamvu yokoka yosalekeza, dongosolo la unyolo la njira ya CMC yokhala ndi polymerization yayikulu imakhala ndi mphamvu yayikulu, ndipo kutuluka kwake kumachedwa. Kuyenda pang'onopang'ono kumasonyeza mamasukidwe akayendedwe.
Kukhuthala kwa sodium carboxymethyl cellulose makamaka kumakhudzana ndi kulemera kwa maselo, ndipo sikukhudzana kwenikweni ndi kuchuluka kwa m'malo. Kuchuluka kwa kulowetsedwa m'malo, ndiko kulemera kwa maselo, chifukwa kulemera kwa maselo a gulu lolowetsedwa la carboxymethyl ndilokulirapo kuposa gulu lakale la hydroxyl.
Mchere wa sodium wa cellulose carboxymethyl ether, annionic cellulose ether, ndi woyera kapena wamkaka woyera fibrous ufa kapena granule, ndi kachulukidwe 0.5-0.7 g/cm3, pafupifupi wosanunkhiza, wosakoma, ndi hygroscopic. N'zosavuta kumwazikana m'madzi kupanga mandala colloidal njira, ndipo insoluble mu organic solvents monga Mowa. PH ya 1% yothetsera madzi ndi 6.5 mpaka 8.5. Pamene pH> 10 kapena <5, kukhuthala kwa sodium carboxymethylcellulose kumachepetsedwa kwambiri, ndipo ntchitoyo ndi yabwino kwambiri pamene pH = 7.
Ndiwokhazikika potentha. Kukhuthala kumakwera mofulumira pansi pa 20 ℃, ndikusintha pang'onopang'ono pa 45 ℃. Kutentha kwanthawi yayitali pamwamba pa 80 ℃ kumatha kutengera colloid ndikuchepetsa kukhuthala ndi magwiridwe antchito kwambiri. Imasungunuka mosavuta m'madzi, ndipo yankho limakhala loonekera; imakhala yokhazikika mumchere wa alkaline, ndipo ndiyosavuta kutulutsa hydrolyze pamaso pa asidi. Pamene pH ili 2-3, imathamanga.
Nthawi yotumiza: Nov-07-2022