HPMC (HydroxyPropyyl methylulose) yog ib txwm siv polymer compound, siv tau dav hauv tshuaj, khoom noj, tshuaj pleev ib ce, tsim kho thiab kev lag luam txheej. Nws cov kev ua tau zoo cuam tshuam los ntawm ntau yam, ntawm qhov twg yog qhov kub muaj qhov cuam tshuam tshwj xeeb ntawm kev tawm tsam HPMC.
1. Cov yam ntxwv ntawm HPMC
HPMC yog cov polymer compound tau los ntawm kev hloov tshuaj lom neeg ntawm ntuj cog cellulose. Nws muaj cov dej ua kom zoo, ua yeeb yaj kiab ua yeeb yam, tuab thiab ruaj khov. Vim tias nws cov qauv tshuaj muaj cov pab pawg hydroxilic xws li cov pab pawg hydroxyl thiab methyl thiab cov pab pawg Hydroyl, HPMC tuaj yeem tsim lub siab viscosity hauv dej. Nws viscosity yog ze ze rau yam xws li cov confentration, hnyav hnyav, kub, thiab pH nqi ntawm kev daws.
2. Cov nyhuv ntawm qhov kub ntawm cov viscosity ntawm HPMC daws
Nce hauv qhov ntsuas kub ua rau kom tsawg hauv viscosity
Lub viscos ntawm HPMC kev daws teeb meem tsawg dua nrog kev nce qib, uas zoo ib yam li cov khoom ntawm feem ntau cov kev daws teeb meem polymer. Thaum qhov kub nce, lub thermal suab ntawm dej molecules nyob rau hauv cov kev daws teeb meem, thiab kev sib txuam ntawm Hydres yuam kev, ua rau muaj kev txo qis ntawm cov kev daws teeb meem. Tshwj xeeb, qhov nce nyob rau hauv kub maj mam rhuav tshem kev sib tw ntawm lub cev thiab hydrogen sib txuas thiab ua kom cov roj molecular, tso cai rau cov roj molecular txav ntau dua, ua rau muaj kev ywj pheej rheology thiab txo viscosity.
Cov nyhuv ntawm kub ntawm molecular suab
Lub viscosity ntawm HPMC kev daws teeb meem tsis yog hais txog cov molecular hnyav thiab kev xav tau, tab sis kuj tseem cuam tshuam nrog kev mus ncig ntawm cov kab molecular. Qhov nce nyob rau hauv qhov kub nce siab tshaj qhov ntsuas hluav taws xob ntawm cov dej lwg me me hauv kev daws teeb meem, thiab kev ua haujlwm ntawm HPMC molecular chains kuj nce. Raws li qhov kub nce ntxiv, qhov yooj ntawm HPMC molecular chains nce, thiab qhov tshwm sim ntawm rheology ntawm txoj kev daws teeb meem, manifested raws li qhov txo qis hauv viscosity.
Theoretical tsom xam ntawm kev cuam tshuam mechanism
Cov kev sib raug zoo ntawm viscosity thiab qhov kub ntawm HPMC kev daws teeb meem feem ntau yuav tau piav qhia los ntawm cov ntawv sib npaug ntawm Arraenius. Txoj kab zauv qhia tau hais tias muaj qee qhov kev sib raug zoo sib xws ntawm cov viscosity ntawm kev daws thiab ntsuas kub. Tshwj xeeb, viscosity (η) ntawm txoj kev daws teeb meem tuaj yeem qhia raws li:
η = η0 exp (RTEA)
Ntawm lawv, η_0 yog ib qho tas mus li, E_a yog lub zog ua kom lub zog, R yog cov roj tas li, thiab t yog qhov kub thiab txias. Thaum kub siab, kev ua kom lub zog ua kom muaj feem ntau dua, ua rau lub viscosity ntawm kev daws teeb meem nrog kub thiab txias.
Thermal Kev Ruaj Ntseg Ntawm HPMC
Txawm hais tias lub viscos ntawm HPMC txo qis nrog kev nce kub, HPMC kev daws teeb meem muaj qhov zoo thermal ruaj khov nyob rau hauv ib qho ntsuas kub. Ntawm ultra-siab kub, cov molecular chains ntawm HPMC tuaj yeem txwv, uas muaj kev txo qis hauv nws cov kev ua kom zoo nkauj, uas nyeg poob rau hauv viscosity. Yog li ntawd, hauv kev siv cov kev siv, HPMC yuav tsum raug zam los ntawm kev raug cov neeg nyob ib puag ncig kub uas tshaj lawv cov hluav taws xob pib.
3. Cov ntaub ntawv thov siv tau ntawm qhov kub ntawm HPMC cov kev daws teeb meem
Kws Tshuaj Kho Mob
Hauv kev lag luam kws tshuaj, HPMC feem ntau siv los ua tus neeg saib xyuas kom tso tawm rau cov tshuaj, cov khoom siv rau lwm yam kev npaj ruaj khov. Cov nyhuv ntawm nws viscosity yog ncaj qha cuam tshuam nrog cov txheej txheem zoo thiab ntau lawm ntawm kev npaj. Kev ntsuas kub dhau qhov kub yuav ua rau muaj kev tawm tsam tsawg dhau, cuam tshuam cov tshuaj tso tawm, yog li nws yog qhov tsim nyog los ua haujlwm nyob rau hauv ntau qhov ntsuas kub.
Kev Lag Luam Khoom Noj
Hauv kev lag luam khoom noj khoom haus, HPMC tau dav siv los ua tuab thiab emulsifier. Thaum lub sij hawm ua zaub mov noj, kub hloov pauv yuav cuam tshuam rau HPMC kev daws teeb meem, yog li cuam tshuam cov saj thiab kev ntxhib los mos ntawm cov khoom. Yog li ntawd, mastering lub viscosity cov yam ntxwv ntawm HPMC kev daws teeb meem ntawm ntau qhov kub yuav pab tswj cov txheej txheem ua zaub mov noj thiab kom lub ruaj khov thiab saj ntawm cov khoom kawg.
Kev Tsim Kho thiab Txheej Kev Lag Luam
Hauv cov ntaub ntawv hauv tsev thiab cov tsho tiv no, lub luag haujlwm tseem ceeb ntawm HPMC yog qhov tuab thiab dej rov qab. Raws li qhov ntsuas kub hloov pauv, lub viscosity hloov ntawm HPMC yuav cuam tshuam rau cov xim dej, cov nplaum thiab ua cov khoom siv ua vaj tse. Yog li ntawd, hauv cov ntawv thov siv, nws yog qhov tsim nyog los kho tus nqi HPMC raws li qhov kub thiab txias kom ntseeg tau tias kev tsim kho.
Kev Lag Luam Kev Lag Luam
Hauv cov tshuaj pleev ib ce, HPMC feem ntau siv nyob rau hauv kev tsim cov khoom lag luam xws li gels thiab emulsions. Cov nyhuv ntawm qhov kub ntawm HPMC tuaj yeem cuam tshuam kev sib kis, ruaj khov thiab pom cov khoom ntawm cov khoom. Ntawm ntau qhov kub thiab txias, qhov viscosity hloov ntawm cov tshuaj pleev ib ce tuaj yeem cuam tshuam cov neeg siv khoom txoj kev paub, yog li cov kev tswj hwm qhov kub ua kom zoo thaum lub sijhawm tsim khoom.
Cov nyhuv ntawm lub viscosity ntawm HPMC kev daws teeb meem yog ib qho txheej txheem ntawm lub cev thiab cov txheej txheem kev hloov pauv ntawm cov roj molecular thiab hloov pauv hauv kev sib txuam sib xyaw. Feem ntau hais lus, qhov nce nce yuav ua rau muaj kev daws teeb meem hauv HPMC, tab sis hauv qhov ntsuas kub, thiab qhov hnyav molecc. Los ntawm kev tshawb fawb tob txog kev sib raug zoo ntawm lub viscosity thiab qhov kub thiab txias, peb tuaj yeem ua kom zoo dua cov txheej txheem ntau lawm, thiab txhim kho cov khoom lag luam zoo.
Lub sijhawm Post: Feb-15-2025