Hydroxypropyl methylcellulose (HPMC) ndi mankhwala osiyanasiyana omwe amagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana chifukwa cha mawonekedwe ake apadera komanso katundu.
1. Chemical:
a. Ma cellulose msana:
HPMC ndi chochokera ku cellulose, kutanthauza kuti imachokera ku cellulose, polysaccharide yachilengedwe yomwe imapezeka m'makoma a cellulose. Selulosi imakhala ndi mayunitsi obwerezabwereza a β-D-glucose olumikizidwa ndi β(1→4) glycosidic bond.
b. Kusintha:
Mu HPMC, gawo la hydroxyl (-OH) la msana wa cellulose limalowetsedwa ndi magulu a methyl ndi hydroxypropyl. Kusintha uku kumachitika ndi etherification reaction. Degree of substitution (DS) imatanthawuza kuchuluka kwa magulu a hydroxyl omwe amalowetsedwa m'malo mwa gawo limodzi la shuga mu tcheni cha cellulose. Ma DS a magulu a methyl ndi hydroxypropyl ndi osiyana, omwe amakhudza magwiridwe antchito a HPMC.
2. Kaphatikizidwe:
a. Etherification:
HPMC imapangidwa ndi etherification ya cellulose ndi propylene oxide ndi methyl chloride. Njirayi imaphatikizapo kuchitapo kanthu pa cellulose ndi propylene oxide kuyambitsa magulu a hydroxypropyl kenako ndi methyl chloride kuyambitsa magulu a methyl.
b. Mlingo wa njira zina zowongolera:
The DS wa HPMC akhoza kulamulidwa ndi kusintha zinthu anachita monga kutentha, nthawi anachita, ndi ndende reactant.
3. Kachitidwe:
a. Kusungunuka:
HPMC ndi sungunuka m'madzi ndi zina zosungunulira organic, monga methanol ndi Mowa. Komabe, kusungunuka kwake kumachepa ndi kuchuluka kwa kulemera kwa maselo ndi kuchuluka kwa m'malo.
b. Kapangidwe kakanema:
HPMC imapanga filimu yowonekera, yosinthika ikasungunuka m'madzi. Mafilimuwa ali ndi mphamvu zamakina abwino komanso zotchinga.
C. Viscosity:
Mayankho a HPMC amawonetsa machitidwe a pseudoplastic, kutanthauza kuti mamasukidwe awo amachepa ndi kuchuluka kwa kukameta ubweya. Kukhuthala kwa mayankho a HPMC kumadalira zinthu monga ndende, kulemera kwa maselo, ndi kuchuluka kwa m'malo.
d. Kusunga madzi:
Chimodzi mwazofunikira za HPMC ndikutha kusunga madzi. Katunduyu ndi wofunikira pamagwiritsidwe osiyanasiyana monga zida zomangira, pomwe HPMC imagwiritsidwa ntchito ngati chowonjezera komanso chosungira madzi.
e. Kumamatira:
HPMC nthawi zambiri amagwiritsidwa ntchito ngati zomatira m'mafakitale osiyanasiyana chifukwa cha kuthekera kwake kupanga zomangira zolimba ku magawo osiyanasiyana.
4. Kugwiritsa ntchito:
a. Makampani opanga mankhwala:
Pazamankhwala, HPMC imagwiritsidwa ntchito ngati chomangira, chotchingira filimu, chowongolera chotulutsa, komanso mawonekedwe a viscosity pamapangidwe a piritsi.
b. Makampani omanga:
HPMC imawonjezedwa ku matope opangidwa ndi simenti, zomata za gypsum ndi zomatira kuti zitheke kugwira ntchito, kusunga madzi komanso kumamatira.
C. makampani azakudya:
M'makampani azakudya, HPMC imagwiritsidwa ntchito ngati thickener, stabilizer ndi emulsifier muzinthu monga sauces, dressings ndi ayisikilimu.
d. Zosamalira munthu:
HPMC imagwiritsidwa ntchito ngati thickener, emulsifier and film-forming agent muzinthu zosamalira anthu monga ma shampoos, mafuta odzola ndi mafuta opaka.
e. Paints ndi Zopaka:
Mu utoto ndi zokutira, HPMC imagwiritsidwa ntchito kukonza kufalikira kwa pigment, kuwongolera kukhuthala komanso kusunga madzi.
Hydroxypropylmethylcellulose (HPMC) ndi gulu losunthika lomwe limagwiritsidwa ntchito mosiyanasiyana m'mafakitale osiyanasiyana. Kapangidwe kake kapadera ka mankhwala, kaphatikizidwe ndi katundu wake zimapangitsa kuti ikhale yofunika kwambiri pazamankhwala, zida zomangira, chakudya, zinthu zosamalira anthu ndi utoto / zokutira. Kumvetsetsa za HPMC kumalola kugwiritsa ntchito makonda m'magawo osiyanasiyana, zomwe zimathandizira kufalikira kwake komanso kufunikira kwake munjira zamakono zopangira.
Nthawi yotumiza: Feb-22-2024