Hydroxypropyl methylcellulose (HPMC) ndi chinthu chogwiritsidwa ntchito m'mafakitale osiyanasiyana chifukwa cha kapangidwe kake ka mankhwala ndi zinthu zake zapadera.
1. Kapangidwe ka mankhwala:
a. Msana wa cellulose:
HPMC ndi chinthu chochokera ku cellulose, zomwe zikutanthauza kuti chimachokera ku cellulose, polysaccharide yachilengedwe yomwe imapezeka m'makoma a maselo a zomera. Cellulose imakhala ndi mayunitsi obwerezabwereza a β-D-glucose olumikizidwa ndi ma β(1→4) glycosidic bonds.
b. Kusintha:
Mu HPMC, gawo la hydroxyl (-OH) la msana wa cellulose limasinthidwa ndi magulu a methyl ndi hydroxypropyl. Kusintha kumeneku kumachitika kudzera mu etherification reaction. Degree of substitution (DS) imatanthauza kuchuluka kwa magulu a hydroxyl omwe amasinthidwa pa unit iliyonse ya shuga mu unyolo wa cellulose. DS ya magulu a methyl ndi hydroxypropyl ndi yosiyana, zomwe zimakhudza magwiridwe antchito a HPMC.
2. Kupanga:
a. Kusinthika kwa Ether:
HPMC imapangidwa kudzera mu etherification reaction ya cellulose ndi propylene oxide ndi methyl chloride. Njirayi imaphatikizapo reaction cellulose ndi propylene oxide kuti ipange magulu a hydroxypropyl kenako ndi methyl chloride kuti ipange magulu a methyl.
b. Mlingo wa njira zina zowongolera:
DS ya HPMC ikhoza kulamulidwa mwa kusintha momwe zinthu zimachitikira monga kutentha, nthawi yochitira, komanso kuchuluka kwa zinthu zomwe zimayambitsa vutoli.
3. Magwiridwe antchito:
a. Kusungunuka:
HPMC imasungunuka m'madzi ndi zinthu zina zachilengedwe monga methanol ndi ethanol. Komabe, kusungunuka kwake kumachepa ndi kulemera kwa mamolekyulu ndi kuchuluka kwa kusintha.
b. Kupanga filimu:
HPMC imapanga filimu yowonekera bwino komanso yosinthasintha ikasungunuka m'madzi. Mafilimuwa ali ndi mphamvu zabwino zamakaniko komanso zotchinga.
C. Kukhuthala:
Mayankho a HPMC amasonyeza khalidwe la pseudoplastic, zomwe zikutanthauza kuti kukhuthala kwawo kumachepa ndi kuchuluka kwa kudulidwa kwa shear. Kukhuthala kwa mayankho a HPMC kumadalira zinthu monga kuchuluka, kulemera kwa mamolekyulu, ndi kuchuluka kwa kusintha.
d. Kusunga madzi:
Chimodzi mwa zinthu zofunika kwambiri za HPMC ndi kuthekera kwake kusunga madzi. Izi ndizofunikira kwambiri pa ntchito zosiyanasiyana monga zipangizo zomangira, komwe HPMC imagwiritsidwa ntchito ngati chokhuthala komanso chosungira madzi.
e. Kumatira:
HPMC nthawi zambiri imagwiritsidwa ntchito ngati guluu m'mafakitale osiyanasiyana chifukwa cha kuthekera kwake kupanga maubwenzi amphamvu ndi zinthu zosiyanasiyana.
4. Kugwiritsa ntchito:
a. Makampani opanga mankhwala:
Mu mankhwala, HPMC imagwiritsidwa ntchito ngati chomangira, chophikira filimu, chotulutsa cholamulidwa, komanso chosinthira kukhuthala kwa ma viscosity mu mapiritsi.
b. Makampani omanga:
HPMC imawonjezeredwa ku mortars zopangidwa ndi simenti, plaster zopangidwa ndi gypsum ndi zomatira za matailosi kuti zigwire bwino ntchito, kusunga madzi ndi kumatira.
C. makampani azakudya:
Mu makampani azakudya, HPMC imagwiritsidwa ntchito ngati chokhuthala, chokhazikika komanso chosakaniza zinthu monga sosi, zodzoladzola ndi ayisikilimu.
d. Zinthu zosamalira thupi:
HPMC imagwiritsidwa ntchito ngati chokhuthala, chosakaniza ndi chopangira filimu mu zinthu zosamalira thupi monga ma shampu, mafuta odzola ndi mafuta odzola.
e. Utoto ndi Zophimba:
Mu utoto ndi zokutira, HPMC imagwiritsidwa ntchito kukonza kufalikira kwa utoto, kuwongolera kukhuthala kwa utoto komanso kusunga madzi.
Hydroxypropylmethylcellulose (HPMC) ndi mankhwala ogwiritsidwa ntchito m'njira zosiyanasiyana omwe amagwiritsidwa ntchito m'mafakitale osiyanasiyana. Kuphatikizika kwake kwapadera kwa mankhwala, kapangidwe kake, ndi makhalidwe ake kumapangitsa kuti ikhale chinthu chofunikira kwambiri mu mankhwala, zipangizo zomangira, chakudya, zinthu zosamalira thupi komanso utoto/zophimba. Kumvetsetsa makhalidwe a HPMC kumalola kugwiritsa ntchito mwamakonda m'magawo osiyanasiyana, zomwe zimathandiza kuti igwiritsidwe ntchito kwambiri komanso kufunika kwake m'njira zamakono zopangira zinthu.
Nthawi yotumizira: Feb-22-2024