Taw qhia:
HydroxyPropyyl methylulose (HPMC) Cov nplaum tau siv dav hauv ntau yam lag luam, suav nrog kev tsim kho, chaw muag tshuaj, thiab khoom noj. Ib qho ntawm cov khoom tseem ceeb ntawm HPMC cov nplaum yog lawv lub peev xwm los nce viscosity, uas yog qhov tseem ceeb rau lawv cov hauj lwm zoo hauv cov ntawv thov sib txawv.
Nkag siab HPMC:
Ua ntej delving rau hauv yuav ua li cas hpmc nplaum nce viscosity, nws yog qhov tseem ceeb kom nkag siab txog HPMC yog thiab nws cov khoom tseem ceeb. HPMC yog lub cellulose derivative synthesized los ntawm cellulose, lub ntuj polymer pom hauv cov nroj tsuag. Nws yog dav siv los ua cov tuab dua, stabilizer, thiab emulsifier vim nws cov yeeb yaj kiab zoo heev-ua yeeb yaj kiab. HPMC feem ntau muaj nyob hauv daim foos hmoov thiab tuaj yeem ua tau yooj yim hauv dej los ua cov tshuaj uas tsis muaj kuab.
Cov tswv yim ntawm viscosity ua kom tiav:
HPMC Adhesives nce viscosity los ntawm ntau cov tshuab, suav nrog cov dej, ua haujlwm, thiab hydrogen khi.
Hydration:
Thaum HPMC hmoov tau dispersed nyob rau hauv dej, nws undergoes hydrohoes hydrophilic hydrophils nkag mus rau Hydrophilic Hydroxypropyl thiab methyl pawg tam sim no hauv HUNMC saw. Cov txheej txheem las voos no ua rau HPMC lwg me ntsis rau swell, ua rau muaj kev nce ntxiv hauv ntim thiab viscosity ntawm kev daws. Cov degree ntawm cov dej nyob ntawm yam xws li cov molecular hnyav thiab concentration ntawm cov hpmc, nrog rau kev mob ib puag ncig zoo li kub thiab Ph.
Entanglement:
HPMC molecules yog cov saw ntev nrog qib siab ntawm kev hloov tau. Thaum dispersed nyob rau hauv dej, cov saw no ua rau ib leeg, sib sau ua tus qauv network uas cuam tshuam qhov ntws ntawm kev daws. Raws li cov concentration ntawm HPMC nce, tus naj npawb ntawm entangles kuj nce, ua rau muaj txiaj ntsig ntau dua. Cov nyhuv tau tshaj plaws yog cov lus tshaj tawm nyob rau ntawm cov hnyav dua molecular ntawm HPMC.
Hydrogen Bonding:
HPMC lwg me me muaj ntau pab pawg hydroxyl (-h) raws lawv cov saw, uas tuaj yeem tsim cov lwg hydrogen nrog cov lwg dej thiab sib. Cov nyiaj pab kasldogen pab txhawb rau cov cohesion thiab ruaj khov ntawm HPMC network, txuas ntxiv txhim kho viscosity. Tsis tas li ntawd, hydrogen sib khi ntawm HPMC lwg me me thiab lwm yam hauv cov qauv nplaum, xws li cov fillers lossis cov quav ntxiv, tuaj yeem cuam tshuam nrog viscosity.
Yam cuam tshuam rau viscosity:
Ntau yam cuam tshuam cov viscosity ntawm HPMC cov nplaum, suav nrog:
Molecular hnyav:
Qhov hnyav molecular ntawm HPMC cuam tshuam loj heev cuam tshuam nws viscosity-txhim kho cov khoom. Lub cev hnyav dua HPMC cov polymers zoo li tsim kom muaj zog thiab ntau cov tes hauj lwm zoo, ua rau muaj txiaj ntsig zoo nkauj.
Concentration:
Cov concentration ntawm HPMC hauv cov txheej txheem nplaum hauv cov nplaum ncaj qha cuam tshuam rau cov viscosity ntawm kev daws. Feem ntau, ntau dua hepmc ua rau muaj ntau zog viscosity vim nce polymer-polymer sib txuas lus thiab entanglements.
Kub:
Qhov kub thiab txias tuaj yeem cuam tshuam cov hydration thiab kev mus ncig ntawm HPMC lwg me me hauv kev daws teeb meem. Feem ntau, qis dua qhov kub thiab txias qeeb qeeb ntawm cov txheej txheem hydration thiab txo txoj kev mus ncig Molecular, uas ua rau visccosity ntau dua. Txawm li cas los xij, huab cua sov hnyav tuaj yeem cuam tshuam rau solubility ntawm HPMC thiab hloov nws tus cwj pwm viscosity.
Ph:
Lub ph ntawm cov kev daws teeb meem tuaj yeem cuam tshuam rau kev ionization xeev ntawm cov pab pawg ua haujlwm ntawm HPMC Molecule, yog li cuam tshuam nws kev sib cuam tshuam nrog dej lwg me thiab lwm yam hauv cov nplaum. Cov kev hloov PH tuaj yeem cuam tshuam kev kawm ntawm kev ua haujlwm ntawm cov dej thiab cov hydrogen khi, kom hloov kho viscosity.
Cov ntawv thov ntawm HPMC nplaum:
HPMC cov nplaum pom pom thoob ntiaj teb thoob plaws ntau yam kev lag luam vim lawv viscosity-txhim kho cov khoom. Qee cov ntawv thov feem muaj xws li:
Kev Tsim Kho:
Hauv kev kho cov khoom siv, HPMC cov nplaum yog siv los ua cov quav ntxiv hauv cov cement-raws li cement-accesives los txhim kho kev ua haujlwm, kom muaj zog, muaj zog. Cov viscosity ntau ntxiv pab tiv thaiv sagging thiab dripping ntawm cov nplaum thaum ntawv thov, kom tau txais kev pab them nyiaj zoo thiab zoo dua adhesion mus rau substrates.
Kws Tshuaj:
Hauv cov tshuaj nplaum ntawm cov tshuaj, HPMC cov nplaum yog siv nyob rau hauv cov ntsiav tshuaj ntsiav tshuaj, kev ncua, thiab tswj-tso cov ntaub ntawv. Lub viscos ntawm HPMC cov kev daws teeb meem yog lub luag haujlwm tseem ceeb hauv kev tswj hwm cov nqi tshuaj tso tawm, tiv thaiv cov tshuaj muab tshuaj, thiab txhim kho qhov tsis muaj peev xwm.
Kev Lag Luam Khoom Noj:
Hauv kev lag luam khoom noj khoom haus, HPMC cov nplaum yog siv ua cov thickeners, stabilizers, thiab emulsifiers hauv ntau cov khoom xws li cov kua qaub, hnav khaub ncaws, thiab khoom qab zib. Cov kev daws teeb meem ntawm HPMC pab txhim kho cov qauv siv, qhov ncauj, thiab tsim cov khoom noj muaj zog ntawm cov zaub mov, ua kom zoo sib xws thiab hnov cov cwj pwm.
HydroxyPropyyl methylulose (HPMC) yog cov khoom nplaum muaj ntau yam paub rau lawv lub peev xwm los ua kom muaj kev tawm tsam hauv aqueous. Los ntawm kev nkag siab ntawm lub tshuab ua raws li cov viscosity ua kom tau raws li daim ntawv thov kev tsim qauv ntawm kev tsim kho, cov ntaub ntawv, khoom noj, thiab lwm yam khoom lag luam. Raws li kev thov rau cov adhesives siab ntxiv mus, HPMC tseem yog tus muaj txiaj ntsig ntxiv rau nws cov qauv viscosity thiab multifaceted.
Lub Sijhawm Post: Feb-18-2025