Kupanga Hydroxypropyl Methylcellulose (HPMC) kumaphatikizapo njira zingapo zovutirapo zomwe zimasintha mapadi kukhala polima wosunthika omwe amagwiritsidwa ntchito mosiyanasiyana m'mafakitale osiyanasiyana.Izi zimayamba ndikuchotsa cellulose kuchokera ku zomera, kutsatiridwa ndi kusintha kwa mankhwala kuti ayambitse magulu a hydroxypropyl ndi methyl pamsana wa cellulose.The chifukwa HPMC polima amapereka katundu wapadera monga thickening, kumanga, filimu kupanga, ndi kusunga madzi.Tiyeni tifufuze mwatsatanetsatane ndondomeko ya kupanga HPMC.
1. Kupeza Zopangira:
Zopangira zopangira HPMC ndi cellulose, zomwe zimachokera ku zomera monga zamkati zamatabwa, ma linters a thonje, kapena zomera zina za fibrous.Magwerowa amasankhidwa kutengera zinthu monga chiyero, zinthu za cellulose, komanso kukhazikika.
2. Kutulutsa Ma cellulose:
Ma cellulose amachotsedwa muzomera zomwe zasankhidwa kudzera munjira zingapo zamakina ndi mankhwala.Poyamba, zopangirazo zimakonzedwa kale, zomwe zingaphatikizepo kuchapa, kupera, ndi kuumitsa kuchotsa zonyansa ndi chinyezi.Kenako, cellulose nthawi zambiri amathandizidwa ndi mankhwala monga alkalis kapena ma acid kuti aphwanye lignin ndi hemicellulose, kusiya ulusi woyeretsedwa wa cellulose.
3. Etherification:
Etherification ndiye njira yayikulu yamakina pakupanga kwa HPMC, komwe magulu a hydroxypropyl ndi methyl amalowetsedwa pamsana wa cellulose.Gawo ili ndilofunika kwambiri pakusintha mawonekedwe a cellulose kuti akwaniritse zofunikira za HPMC.Etherification imachitika chifukwa cha zomwe cellulose ndi propylene oxide (yamagulu a hydroxypropyl) ndi methyl chloride (yamagulu a methyl) pamaso pa zoyambitsa zamchere pansi pa kutentha ndi kukakamizidwa.
4. Kusalowerera ndale ndi Kuchapa:
Pambuyo etherification, zimene osakaniza ndi neutralized kuchotsa otsala alkali catalysts ndi kusintha pH mlingo.Izi zimachitika powonjezera asidi kapena maziko malinga ndi momwe zimachitikira.Kusalowerera ndale kumatsatiridwa ndi kutsuka bwino kuti muchotse zinthu, mankhwala osakhudzidwa, ndi zonyansa kuchokera kuzinthu za HPMC.
5. Sefa ndi Kuyanika:
The neutralized ndi kutsukidwa HPMC yankho akukumana kusefera kulekanitsa particles olimba ndi kupeza yankho lomveka bwino.Kusefera kungaphatikizepo njira zosiyanasiyana monga kusefera kwa vacuum kapena centrifugation.Njirayi ikamveka bwino, imawuma kuchotsa madzi ndikupeza HPMC mu mawonekedwe a ufa.Njira zoyanika zingaphatikizepo kuyanika mopopera mankhwala, kuyanika pabedi, kapena kuyanika ng'oma, malingana ndi kukula kwa tinthu tating'ono ndi katundu wa chinthu chomaliza.
6. Kupera ndi Kusefa (Ngati mukufuna):
Nthawi zina, zouma HPMC ufa akhoza kuchitidwanso processing zina monga akupera ndi sieving kukwaniritsa makulidwe enieni tinthu ndi kusintha flowability.Gawo ili limathandizira kupeza HPMC yokhala ndi mawonekedwe ofananirako oyenera kugwiritsa ntchito zosiyanasiyana.
7. Kuwongolera Ubwino:
Panthawi yonse yopangira, njira zowongolera bwino zimayendetsedwa kuti zitsimikizire kuyera, kusasinthika, komanso magwiridwe antchito azinthu za HPMC.Magawo owongolera khalidwe angaphatikizepo kukhuthala, kugawa kukula kwa tinthu, chinyezi, kuchuluka kwa m'malo (DS), ndi zina zofunika.Njira zowunikira monga miyeso ya viscosity, spectroscopy, chromatography, ndi ma microscopy amagwiritsidwa ntchito poyesa kuwunika.
8. Kuyika ndi Kusunga:
Chogulitsa cha HPMC chikadutsa mayeso owongolera, chimayikidwa muzotengera zoyenera monga matumba kapena ng'oma ndikuzilemba molingana ndi zomwe mukufuna.Kuyika bwino kumathandiza kuteteza HPMC ku chinyezi, kuipitsidwa, ndi kuwonongeka kwa thupi panthawi yosungira ndi kuyendetsa.HPMC yopakidwa imasungidwa m'malo olamulidwa kuti ikhalebe yokhazikika komanso yanthawi yayitali mpaka itakonzeka kugawidwa ndi kugwiritsidwa ntchito.
Ntchito za HPMC:
Hydroxypropyl Methylcellulose amapeza kugwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana kuphatikiza mankhwala, zomangamanga, chakudya, zodzoladzola, ndi zinthu zosamalira anthu.M'zamankhwala, amagwiritsidwa ntchito ngati chomangira, chosokoneza, choyambitsa filimu, komanso chotulutsa nthawi zonse pamapangidwe a piritsi.Pomanga, HPMC imagwiritsidwa ntchito ngati chokhuthala, chosungira madzi, komanso chosinthira rheology mumatope opangidwa ndi simenti, pulasitala, ndi zomatira matailosi.Muzakudya, zimakhala ngati zonenepa, zokhazikika, komanso zokometsera zinthu monga sosi, soups, ndi zokometsera.Kuphatikiza apo, HPMC imagwiritsidwa ntchito muzodzoladzola ndi zinthu zosamalira anthu pakupanga mafilimu, kunyowa, komanso kusintha mawonekedwe.
Zolinga Zachilengedwe:
Kupanga kwa HPMC, monga njira zambiri zamafakitale, kumakhudza chilengedwe.Khama likuchitika pofuna kupititsa patsogolo kukhazikika kwa kupanga kwa HPMC kudzera m'zinthu monga kugwiritsa ntchito mphamvu zongowonjezedwanso, kukhathamiritsa kagwiritsidwe ntchito kazinthu zopangira, kuchepetsa kuwononga zinyalala, ndikugwiritsa ntchito matekinoloje opangira zachilengedwe.Kuphatikiza apo, kupanga HPMC yochokera ku bio-based HPMC yochokera kuzinthu zokhazikika monga ndere kapena kuwira kwa tizilombo tating'onoting'ono kukuwonetsa lonjezano pakuchepetsa chilengedwe cha kupanga HPMC.
kupanga Hydroxypropyl Methylcellulose kumaphatikizapo masitepe angapo kuyambira kutulutsa mapadi kupita ku kusintha kwa mankhwala, kuyeretsa, ndi kuwongolera khalidwe.Zotsatira za polima za HPMC zimapereka magwiridwe antchito osiyanasiyana ndipo zimapeza ntchito m'mafakitale osiyanasiyana.Kuyesetsa kukhazikika komanso udindo wa chilengedwe kukuyendetsa zatsopano pakupanga kwa HPMC, ndicholinga chochepetsa kuwononga chilengedwe ndikukwaniritsa kufunikira kwa polima wosunthika uyu.
Nthawi yotumiza: Mar-05-2024