Methylcellulose (MC) ndi chinthu chodziwika bwino cha polima chopangidwa ndi mankhwala, ether yosinthidwa ya cellulose yomwe imapezeka pogwiritsa ntchito cellulose yachilengedwe ya methylating. Chifukwa cha mawonekedwe ake apadera komanso a mankhwala, imagwiritsidwa ntchito kwambiri popanga zinthu, chakudya, mankhwala, zodzoladzola, mapepala ndi zokutira.
1. Kugawa m'magulu malinga ndi mlingo wa kusintha
Mlingo wa kusintha (DS) umatanthauza kuchuluka kwapakati kwa magulu a hydroxyl omwe amasinthidwa ndi magulu a methyl pa unit iliyonse ya shuga mu methylcellulose. Pali magulu atatu a hydroxyl pa mphete iliyonse ya shuga ya molekyulu ya cellulose omwe angasinthidwe ndi magulu a methyl. Chifukwa chake, mlingo wa kusintha kwa methylcellulose ukhoza kusiyana kuyambira 0 mpaka 3. Malinga ndi mlingo wa kusintha, methylcellulose ikhoza kugawidwa m'magulu awiri: mlingo wapamwamba wa kusintha ndi mlingo wotsika wa kusintha.
Mlingo wapamwamba wa methylcellulose wosinthira (DS > 1.5): Mtundu uwu wa chinthu uli ndi mlingo wapamwamba wa methyl wosinthira, kotero sichimawopa madzi, sichimasungunuka kwambiri komanso sichimalimbana ndi madzi. Nthawi zambiri chimagwiritsidwa ntchito popanga zinthu zomangira, zokutira ndi zina zomwe zimafuna kuchuluka kwa hydrophobicity.
Mlingo wochepa wa methylcellulose yosinthira (DS < 1.5): Chifukwa cha kuchepa kwa methyl, mtundu uwu wa mankhwala umakhala wokonda madzi, umasungunuka bwino ndipo ukhoza kusungunuka m'madzi ozizira. Methylcellulose yosinthira pang'ono imagwiritsidwa ntchito kwambiri m'mafakitale azakudya ndi mankhwala monga chokhuthala, chosakaniza ndi chokhazikika.
2. Kugawa m'magulu pogwiritsa ntchito
Malinga ndi momwe methylcellulose imagwiritsidwira ntchito m'magawo osiyanasiyana, imatha kugawidwa m'magulu awiri: methylcellulose ya mafakitale ndi methylcellulose yazakudya ndi zamankhwala.
Methylcellulose ya mafakitale: Amagwiritsidwa ntchito makamaka pakupanga, zophimba, kupanga mapepala, zoumba ndi mafakitale ena monga chokhuthala, chomatira, chopangira filimu, chosungira madzi, ndi zina zotero. Mumakampani omanga, methylcellulose imagwiritsidwa ntchito mu simenti ndi zinthu za gypsum kuti iwonjezere magwiridwe antchito ndi kulimba kwa zomangamanga; mumakampani ophimba, methylcellulose imatha kuwonjezera kukhazikika ndi kufalikira kwa zophimba.
Methylcellulose ya zakudya ndi mankhwala: Chifukwa cha mphamvu zake zopanda poizoni komanso zopanda vuto, methylcellulose imagwiritsidwa ntchito ngati chowonjezera mu chakudya ndi mankhwala. Mu chakudya, methylcellulose ndi chinthu chofala kwambiri chomwe chingathe kukhazikika kapangidwe ka chakudya ndikuletsa kugawikana kapena kupatukana; m'munda wa mankhwala, methylcellulose ingagwiritsidwe ntchito ngati chipolopolo cha kapisozi, chonyamulira mankhwala, komanso imagwira ntchito ngati mankhwala otulutsidwa nthawi zonse. Kudya kwake komanso chitetezo chake zimapangitsa methylcellulose kukhala yotchuka kwambiri m'magawo awiriwa.
3. Kugawa m'magulu malinga ndi kusungunuka
Methylcellulose imagawidwa m'magulu awiri makamaka pankhani ya kusungunuka: mtundu wosungunuka m'madzi ozizira ndi mtundu wosungunuka wa organic solvent.
Methylcellulose yosungunuka m'madzi ozizira: Mtundu uwu wa methylcellulose ukhoza kusungunuka m'madzi ozizira kuti upange yankho lowonekera komanso lokhuthala pambuyo posungunuka. Nthawi zambiri umagwiritsidwa ntchito m'mafakitale azakudya ndi mankhwala ngati chokhuthala kapena chopangira filimu. Kusungunuka kwa mtundu uwu wa methylcellulose kumachepa kutentha kukakwera, kotero mawonekedwe awa angagwiritsidwe ntchito poyang'anira zomangamanga akagwiritsidwa ntchito m'makampani omanga.
Methylcellulose yosungunuka yachilengedwe: Mtundu uwu wa methylcellulose ukhoza kusungunuka mu zosungunulira zachilengedwe ndipo nthawi zambiri umagwiritsidwa ntchito mu utoto, zokutira ndi madera ena amafakitale omwe amafunikira zinthu zachilengedwe. Chifukwa cha mphamvu zake zopangira filimu komanso kukana mankhwala, ndi woyenera kugwiritsidwa ntchito m'mikhalidwe yovuta yamafakitale.
4. Kugawa ndi kulemera kwa maselo (kukhuthala)
Kulemera kwa molekyulu ya methylcellulose kumakhudza kwambiri makhalidwe ake enieni, makamaka magwiridwe antchito a kukhuthala mu yankho. Malinga ndi kulemera kwa molekyulu, methylcellulose ikhoza kugawidwa m'magulu awiri: mtundu wokhuthala wochepa ndi mtundu wokhuthala wokwera.
Methylcellulose yotsika kwambiri: Kulemera kwa mamolekyulu ndi kochepa ndipo kukhuthala kwa yankho ndi kochepa. Nthawi zambiri imagwiritsidwa ntchito muzakudya, mankhwala ndi zodzoladzola, makamaka popangira emulsification, suspension ndi thickening. Methylcellulose yotsika kwambiri imatha kusunga kusinthasintha kwabwino komanso kufanana, ndipo ndi yoyenera kugwiritsidwa ntchito komwe kumafunikira njira zochepetsera kukhuthala.
Methylcellulose yokhala ndi kukhuthala kwakukulu: Ili ndi kulemera kwakukulu kwa mamolekyulu ndipo imapanga yankho lokhuthala kwambiri ikasungunuka. Nthawi zambiri imagwiritsidwa ntchito popanga zipangizo zomangira, zokutira ndi zomatira zamafakitale. Methylcellulose yokhala ndi kukhuthala kwakukulu imatha kuwonjezera mphamvu yamakina, kukana kuvala ndi kumatira kwa yankho, kotero imagwiritsidwa ntchito kwambiri pazinthu zomwe zimafuna mphamvu zambiri komanso kukana kuvala kwambiri.
5. Kugawa magulu malinga ndi kuchuluka kwa kusintha kwa mankhwala
Methylcellulose ndi chinthu chopangidwa ndi cellulose chosinthidwa ndi mankhwala. Malinga ndi njira yosinthira ndi digiri yake, chingagawidwe m'magulu awiri: single methyl cellulose ndi composite modified cellulose.
Single methyl cellulose: imatanthauza ma ether a cellulose omwe amangosinthidwa kukhala methyl. Mtundu uwu wa chinthu uli ndi mphamvu zokhazikika zakuthupi ndi zamakemikolo, ndipo mphamvu zake zosungunukira, kukhuthala ndi kupanga filimu ndi zabwino.
Cellulose yosinthidwa ndi Composite: Kuwonjezera pa methylation, imachiritsidwanso ndi mankhwala, monga hydroxypropylation, ethylation, ndi zina zotero, kuti ipange chinthu chosinthidwa ndi Composite. Mwachitsanzo, hydroxypropyl methylcellulose (HPMC) ndi carboxymethyl cellulose (CMC). Cellulose yosinthidwa ndi Composite iyi nthawi zambiri imakhala ndi madzi osungunuka bwino, kukana kutentha komanso kukhazikika, ndipo imatha kusintha malinga ndi zosowa zosiyanasiyana zamafakitale.
6. Kugawa m'magulu malinga ndi makampani ogwiritsira ntchito
Kugwiritsa ntchito kwambiri methylcellulose kumalola kuti iikidwe m'magulu malinga ndi momwe imagwiritsidwira ntchito m'mafakitale osiyanasiyana.
Methylcellulose ya makampani omanga: Imagwiritsidwa ntchito makamaka mu zinthu zopangidwa ndi simenti ndi gypsum ngati chosungira madzi ndi chokhuthala. Imatha kukonza magwiridwe antchito a zipangizo zomangira, kupewa kutaya madzi msanga, komanso kuwonjezera mphamvu ya makina a zinthu zomalizidwa.
Methylcellulose yopangidwa ndi makampani azakudya: Monga emulsifier, thickener ndi stabilizer pokonza chakudya. Imatha kupewa kutayika kwa madzi, kukonza kukoma ndi kapangidwe ka chakudya, ndikuwonjezera nthawi yosungira chakudya.
Methylcellulose yopangidwa ndi makampani opanga mankhwala: Monga chomangira mapiritsi kapena chinthu chotulutsira mankhwala nthawi zonse. Methylcellulose ingagwiritsidwenso ntchito popanga mankhwala am'mimba ngati chonyamulira mankhwala chotetezeka komanso chogwira ntchito bwino.
Methylcellulose yopangidwa ndi makampani okongoletsa: Mu zinthu zosamalira khungu ndi zodzoladzola, methylcellulose imagwiritsidwa ntchito ngati chokhuthala, chosakaniza ndi chonyowetsa khungu kuti chithandize zinthuzo kupanga kapangidwe kofewa komanso kosalala pamene zikuwonjezera mphamvu ya chinyezi.
Mwachidule, pali njira zambiri zogawira methylcellulose m'magulu, zomwe zingagawidwe m'magulu malinga ndi kapangidwe kake ka mankhwala, kapena malinga ndi magawo ake ogwiritsira ntchito komanso momwe amasungunukira. Njira zosiyanasiyanazi zimatithandiza kumvetsetsa bwino makhalidwe ndi ntchito za methylcellulose, komanso kupereka maziko a chiphunzitso cha momwe imagwiritsidwira ntchito m'magawo osiyanasiyana.
Nthawi yotumizira: Okutobala-23-2024