I-HPMC (i-hydroxypropyl methylcellulose) i-multifunctional polymer additive esetyenziswa ngokubanzi kwizinto zokwakha, ngakumbi kwizinto ezisekelwe kwi-samente. Ukuqaliswa kwe-HPMC kunokuphucula kakhulu ukusebenza kwezinto ezisekelwe kwi-samente, kubandakanywa nokuphucula ukuchasana nokuqhekeka, ukuphucula ukusebenza kunye nokulawula inkqubo ye-hydration, ngokunciphisa ngokufanelekileyo ukuvela kokuqhekeka.
Iipropati zeMichiza kunye nezomzimba ze-HPMC
I-HPMC yi-semi-synthetic polymer eguqulwe ngokwekhemikhali ukusuka kwiselulosi. Isakhiwo sayo se-molecular ibandakanya i-methyl kunye ne-hydroxypropyl substituents, inika ukunyibilika okukodwa, ukuqina, ukugcinwa kwamanzi kunye neepropati zokwenza ifilimu. Iimpawu zayo eziphambili ziquka:
Ukugcinwa kwamanzi aphezulu: I-HPMC inomthamo ogqwesileyo wogcino lwamanzi kwaye inokwenza ifilimu yokugcina amanzi ngaphakathi kwemathiriyeli ukucothisa ukuphuphuma kwamanzi.
Isiphumo esityebileyo: I-HPMC inokunyusa kakhulu i-viscosity ye-slurry, ngaloo ndlela iphucula ukusebenza kwayo.
Iimpawu zokwenza ifilimu: Ikhono layo elihle lokwenza ifilimu linokwenza ifilimu eguquguqukayo phezu kwezinto eziphathekayo, inika ukhuseleko olongezelelweyo lomzimba.
Inkqubo yempembelelo ye-HPMC ekuqhekekeni kwezinto ezisekwe kwisamente
1. Ukugcinwa kwamanzi kunye nokunciphisa ukuqhekeka kwe-shrinkage eyomileyo
Izixhobo zesamente zifumana ukucutha okubalulekileyo kwevolumetric ngexesha lokuqina, ngokuyintloko ngenxa yokulahleka kwamanzi kunye nokuncipha komisa ngenxa yokusabela kwe-hydration. Ukomisa ukuqhekeka kwe-shrinkage ngokuqhelekileyo kubangelwa ukuphuphuma kwamanzi ngokukhawuleza kwi-slurry ye-samente ngexesha lenkqubo yokuqina, okubangelwa ukuncipha komthamo ongalinganiyo, ngaloo ndlela kubangele ukuqhekeka. Iipropati zokugcina amanzi ze-HPMC zidlala indima ebalulekileyo koku:
Icothisa ukuphuphuma kwamanzi: I-HPMC igcina ukufuma kudaka lwesamente, ngaloo ndlela ithoba isantya sokuphuma kwamanzi ngumphunga. Esi siphumo sokugcinwa kwamanzi asincedi nje kuphela ukwandisa ixesha lokuphendula kwe-hydration, kodwa kunciphisa ukucutha ukomisa okubangelwa kukuphuma kwamanzi.
Ukusabela okulinganayo kwe-hydration: Ekubeni i-HPMC ibonelela ngokusingqongileyo okuzinzile kwamanzi, amaqhekeza e-samente angakwazi ukufumana i-uniform kunye ne-hydration reaction eyaneleyo, ukunciphisa ukuhlukana koxinzelelo lwangaphakathi kunye nokunciphisa umngcipheko wokuqhekeka okubangelwa yi-shrinkage eyomileyo.
2. Ukuphucula i-viscosity kunye nokusabalalisa ukufana kwezinto
I-HPMC inesiphumo sokuqina, esidlala indima ebalulekileyo ekuphuculeni ukusebenza kunye nokufana kwezinto ezisekelwe kwisamente:
Ukwandiswa kwe-Viscosity: I-HPMC yandisa i-viscosity ye-slurry, iphucula ukusebenza ngexesha lesicelo, ivumela i-slurry ukuba iqhube kakuhle kwaye igcwalise i-molds okanye i-cracks, ukunciphisa i-voids kunye neendawo ezingalinganiyo.
Ukusabalalisa okufanayo: Ngokunyusa i-viscosity ye-slurry, i-HPMC yenza ukuhanjiswa kweefayili kunye neefayibha kwi-slurry ngakumbi, kubangele isakhiwo sangaphakathi esifanayo ngexesha lenkqubo yokuqina kunye nokunciphisa ukuqhekeka ngenxa yoxinzelelo olugxininisiweyo lwendawo.
3. Ukuphucula iipropati zokwenza ifilimu kunye nokukhusela umphezulu
Iipropati zokwenza ifilimu ye-HPMC inceda ukwenza umaleko okhuselayo kumphezulu wezinto eziphathekayo, onempembelelo entle ekunciphiseni iintanda zomhlaba:
Ukukhuselwa komphezulu: Uluhlu lwefilimu oluguquguqukayo olwenziwe yi-HPMC kumphezulu wezinto eziphathekayo lunokukhusela umphezulu ukusuka ekukhukulisekeni kwendawo yangaphandle kunye nokulahleka komswakama okukhawulezayo, ngaloo ndlela kuncitshiswe ukwenzeka kokuqhekeka komhlaba.
I-Flexible coverage: Lo mboniso wefilimu unomlinganiselo othile wokuguquguquka kwaye unokuthatha inxalenye yoxinzelelo ngexesha lokuguqulwa okuncinci, ngaloo ndlela kuthintela okanye ukunciphisa ukwanda kweentanda.
4. Ukulawula inkqubo yokufakwa kwamanzi
I-HPMC inokulawula inkqubo ye-hydration yesamente, edlala indima ebalulekileyo ekunciphiseni uxinzelelo olubangelwa kukungabikho kokungalingani:
I-Slow-release-release hydration: I-HPMC inokunciphisa ukusabela ngokukhawuleza kwe-hydration, ivumela amanzi kwi-slurry ye-samente ukuba akhululwe ngokuthe ngcembe, ngaloo ndlela enikezela indawo efanayo kunye ne-hydration eqhubekayo. Esi siphumo sokukhululwa kancinci sinciphisa uxinzelelo olubangelwa kukusabela okungalinganiyo kwe-hydration, ngaloo ndlela kunciphisa umngcipheko wokuqhekeka.
Imizekelo yokusetyenziswa kwe-HPMC kwizinto ezahlukeneyo ezisekwe kwisamente
I-HPMC isetyenziswa ngokubanzi kwizinto ezisekelwe kwisamente, kubandakanywa kodwa kungaphelelanga kwimigangatho yokuzimela, iingubo zangaphandle zodonga, udaka kunye nezixhobo zokulungisa ikhonkrithi. Le ilandelayo yimizekelo ethile yesicelo:
1. Izinto zomgangatho ozimeleyo
Izixhobo zomgangatho ozimele zifuna i-fluidity efanelekileyo kunye neempawu ezibophezelayo ngelixa ziphepha ukuqhekeka komhlaba. I-HPMC iphucula ukuhamba kunye nokugqiba komphezulu wemathiriyeli ngokujiya kwayo kunye neziphumo zokugcinwa kwamanzi ngelixa inciphisa ukwenzeka kokuqhekeka komphezulu.
2. Ipeyinti yodonga lwangaphandle
Ipeyinti yangaphandle ifuna ukubambelela kakuhle kunye nokumelana nokuqhekeka. Iipropati zokwenza ifilimu kunye nokugcinwa kwamanzi kwe-HPMC iphucula ukunamathela kunye nokuguquguquka kwengubo, ngaloo ndlela iphucula ukuxhathisa kokuqhekeka kwengubo kunye nokuqina kwemozulu.
3. Ukulungisa imathiriyeli
Izinto zokulungiswa kwekhonkrithi zifuna amandla aphezulu kunye nokuqina ngokukhawuleza ngelixa ugcina i-shrinkage ephantsi yokomisa. I-HPMC inikezela ngokugqwesileyo kokugcinwa kwamanzi kunye nokulawulwa kwe-hydration, ukuvumela izinto zokulungisa ukuba zigcine i-shrinkage ephantsi eyomileyo ngexesha lenkqubo yokuqina kunye nokunciphisa umngcipheko wokuqhekeka emva kokulungiswa.
Imiqathango yokusebenzisa i-HPMC
Nangona i-HPMC inefuthe elibonakalayo ekunciphiseni ukuqhekeka kwezinto ezisekwe kwisamente, ezi ngongoma zilandelayo kusafuneka ziqatshelwe ngexesha lokusetyenziswa:
Ulawulo lomthamo: Umthamo we-HPMC kufuneka ungqinelane ngokungqongqo neemfuno zefomula. Okuninzi okanye kuncinci kuya kuchaphazela ukusebenza kwezinto eziphathekayo. Ngokuqhelekileyo, umthamo uphakathi kwe-0.1% - 0.5%.
Ukuxuba Uniformity: I-HPMC kufuneka ixutywe ngokucokisekileyo kunye nezinye izinto ukuqinisekisa ukuba isebenza kulo lonke udaka.
Iimeko zokwakha: Indawo yokwakha (efana nobushushu, ukufuma) nayo inefuthe kwisiphumo se-HPMC, kwaye kufuneka ilungelelaniswe ngokufanelekileyo ngokwemiqathango ethile.
Njengesongezo esisebenzayo esisekwe kwisamente, i-HPMC idlala indima ebalulekileyo ekunciphiseni ukuqhekeka kwezinto ezisekelwe kwi-samente ngokusebenzisa ukugcinwa kwamanzi okukodwa, ukuqina, ukwenza ifilimu kunye neempawu zokulawula ukuhanjiswa kwamanzi. Ilibazisa ukuvela kwamanzi, iphucula ukufana kwezinto, ikhusela iindawo eziphathekayo, kwaye ilawula inkqubo ye-hydration, ngaloo ndlela inciphisa kakhulu umngcipheko wokuqhekeka. Ngoko ke, ekusetyenzisweni kwezinto ezisekelwe kwi-samente, ukusetyenziswa okunengqiqo kwe-HPMC akukwazi nje ukuphucula ukusebenza kwezinto eziphathekayo, kodwa nokwandisa ubomi benkonzo kunye nokunciphisa iindleko zokugcina.
Ixesha lokuposa: Jun-26-2024