Methylcellulose (MC) ndi carboxymethylcellulose (CMC) ndi zotumphukira ziwiri zodziwika bwino za cellulose, zomwe zimagwiritsidwa ntchito kwambiri muzakudya, zamankhwala, zomangamanga, makampani opanga mankhwala ndi magawo ena. Ngakhale kuti zonse zimasinthidwa ndi mankhwala kuchokera ku cellulose yachilengedwe, pali kusiyana kwakukulu pamapangidwe amankhwala, thupi ndi mankhwala, ndi ntchito.
1. Mapangidwe a mankhwala ndi ndondomeko yokonzekera
Methylcellulose amapangidwa pochita mapadi ndi methyl chloride (kapena methanol) pansi pamikhalidwe yamchere. Panthawiyi, gawo lamagulu a hydroxyl (-OH) m'maselo a cellulose amasinthidwa ndi magulu a methoxy (-OCH₃) kuti apange methylcellulose. Madigiri olowa m'malo (DS, kuchuluka kwa zolowa m'malo mwa glucose unit) wa methylcellulose amatsimikizira momwe thupi lake limakhalira komanso mankhwala, monga kusungunuka ndi kukhuthala.
Carboxymethylcellulose amapangidwa ndikuchitapo kanthu pa cellulose ndi chloroacetic acid pansi pamikhalidwe yamchere, ndipo gulu la hydroxyl limasinthidwa ndi carboxymethyl (-CH₂COOH). Mlingo wolowa m'malo ndi digiri ya polymerization (DP) ya CMC imakhudza kusungunuka kwake ndi kukhuthala kwake m'madzi. CMC nthawi zambiri imakhala mu mawonekedwe a mchere wa sodium, wotchedwa sodium carboxymethylcellulose (NaCMC).
2. Thupi ndi mankhwala katundu
Kusungunuka: Methylcellulose amasungunuka m'madzi ozizira, koma amataya kusungunuka ndikupanga gel osakaniza m'madzi otentha. Kusinthika kwamafuta uku kumathandizira kugwiritsidwa ntchito kwake ngati chowonjezera komanso chopangira ma gelling pokonza chakudya. CMC imasungunuka m'madzi ozizira komanso otentha, koma kukhuthala kwa yankho lake kumachepa pamene kutentha kumawonjezeka.
Viscosity: The mamasukidwe akayendedwe a onse amakhudzidwa ndi mlingo wa m'malo ndi yankho ndende. The mamasukidwe akayendedwe a MC choyamba kumawonjezeka ndiyeno amachepetsa pamene kutentha ukuwonjezeka, pamene mamasukidwe akayendedwe a CMC amachepetsa pamene kutentha ukuwonjezeka. Izi zimawapatsa mwayi wawo pazochita zosiyanasiyana zamafakitale.
pH kukhazikika: CMC imakhalabe yokhazikika pamitundu yambiri ya pH, makamaka pansi pamikhalidwe yamchere, yomwe imapangitsa kuti ikhale yotchuka kwambiri ngati chokhazikika komanso chokhuthala muzakudya ndi mankhwala. MC imakhala yokhazikika pansi pazandale komanso zamchere pang'ono, koma zimawonongeka mu ma acid amphamvu kapena alkalis.
3. Malo ogwiritsira ntchito
Makampani azakudya: Methylcellulose amagwiritsidwa ntchito kwambiri muzakudya ngati thickener, emulsifier ndi stabilizer. Mwachitsanzo, imatha kutengera kukoma ndi kapangidwe ka mafuta popanga zakudya zopanda mafuta ambiri. Carboxymethylcellulose amagwiritsidwa ntchito kwambiri muzakumwa, zophika ndi mkaka ngati thickener ndi stabilizer kuteteza madzi kulekana ndi kusintha kukoma.
Makampani opanga mankhwala: Methylcellulose amagwiritsidwa ntchito popanga mapiritsi opangira mankhwala ngati chomangira komanso chosungunula, komanso ngati mafuta opangira mafuta komanso oteteza, monga madontho amaso a maso monga cholowa m'malo mwa misozi. CMC imagwiritsidwa ntchito kwambiri muzamankhwala chifukwa cha biocompatibility yake yabwino, monga kukonzekera kwamankhwala osasunthika komanso zomatira pamadontho amaso.
Makampani omanga ndi mankhwala: MC imagwiritsidwa ntchito kwambiri muzomangamanga ngati thickener, chosungira madzi ndi zomatira pa simenti ndi gypsum. Ikhoza kupititsa patsogolo ntchito yomanga komanso khalidwe lapamwamba la zipangizo. CMC imagwiritsidwa ntchito pochiza matope mumigodi yamafuta, slurry pakusindikiza nsalu ndi utoto, zokutira pamapepala, ndi zina zambiri.
4. Chitetezo ndi kuteteza chilengedwe
Onsewa amawonedwa kuti ndi otetezeka kuti agwiritsidwe ntchito pazakudya ndi zamankhwala, koma magwero awo ndi njira zopangira zitha kukhala ndi zotsatira zosiyana pa chilengedwe. Zopangira za MC ndi CMC zimachokera ku cellulose yachilengedwe ndipo zimatha kuwonongeka, motero zimagwira ntchito bwino potengera chilengedwe. Komabe, kupanga kwawo kungaphatikizepo zosungunulira zamankhwala ndi ma reagents, zomwe zitha kukhudza chilengedwe.
5. Mtengo ndi kufunikira kwa msika
Chifukwa cha njira zosiyanasiyana zopangira, mtengo wopangira methylcellulose nthawi zambiri umakhala wokwera, motero mtengo wake wamsika umakhalanso wokwera kuposa carboxymethylcellulose. CMC nthawi zambiri imakhala ndi kufunikira kwakukulu pamsika chifukwa chakugwiritsa ntchito kwambiri komanso kutsika kwamitengo yopangira.
Ngakhale methylcellulose ndi carboxymethylcellulose onse ndi ochokera ku cellulose, ali ndi kusiyana kwakukulu pamapangidwe, katundu, kagwiritsidwe ntchito komanso kufunikira kwa msika. Methylcellulose amagwiritsidwa ntchito makamaka m'minda yazakudya, mankhwala ndi zida zomangira chifukwa cha kusinthika kwake kwapadera kwamafuta komanso kuwongolera kwakanthawi kochepa. Carboxymethyl cellulose yakhala ikugwiritsidwa ntchito kwambiri muzakudya, zamankhwala, petrochemical, nsalu ndi mafakitale ena chifukwa cha kusungunuka kwake kwabwino, kusintha kwa mamasukidwe akayendedwe komanso kusinthasintha kwa pH. Kusankha kochokera ku cellulose kumatengera momwe amagwiritsira ntchito komanso zosowa zake.
Nthawi yotumiza: Aug-20-2024