HPMC (HydroxyPropyyl methylulose) yog qhov muaj txiaj ntsig zoo ntxiv thiab siv dav hauv kev tsim cov txheej txheem thiab xim pleev xim. Ib qho ntawm nws txoj haujlwm tseem ceeb yog txhawm rau txhim kho viscance viscosity tswj, uas tsis tsuas yog ua kom cov rheology ntawm cov kev tsim kho thiab cov duab ua khoom zoo thiab cov yeeb yaj kiab kawg.
1. Cov khoom yooj yim ntawm HPMC
HPMC yog cov tsis-ionic cellulose ither nrog cov dej ua kom zoo thiab cov organic daws solubility. Nws tuaj yeem yaj thiab tsim cov tshuaj khov kho nyob rau ntawm ntau qhov kub thiab pH qhov tseem ceeb. Lub ntsiab me me ntawm kev ua ntawm HPMC yog tsim lub network qauv los ntawm cov khoom siv hluav taws xob hydrogen thiab cuam tshuam rau cov khoom ntawm cov txheej txheem lossis xim pleev xim rau. Nws viscosity hloov nrog kev hloov pauv hauv siab, kub, shear tus nqi thiab lwm yam, uas ua rau nws cov xim pleev xim muaj qhov chaw muaj teeb meem loj.
2. Muaj nuj nqi ntawm HPMC nyob rau hauv cov txheej txheem thiab xim av
Viscosity Haum hloov: Lub luag haujlwm tseem ceeb ntawm HPMC yog los kho lub viscosity ntawm lub system. Hauv cov xim pleev xim thiab cov xim tha xim, viscosity yog ib qho tseem ceeb uas cuam tshuam rau kev tsim kho, qib, thiab cov yeeb yaj kiab kawg ntawm cov khoom. HPMC tuaj yeem tswj hwm lub viscisly ntawm txheej los ntawm kev hloov cov qauv molecular lossis concentring qhov ruaj khov thiab ua haujlwm ntawm txheej thaum lub sijhawm cia, tsheb thauj mus los thiab tsim kho.
Rheological tswj: HPMC muab cov txheej txheej lossis pleev xim ua kom muaj viscosity heev thaum zoo li cov viscosity hos Qhov no thixotropy yog qhov tseem ceeb rau kev tsim kho cov txheej txheem thiab cov xim pleev xim, tshwj xeeb yog thaum muaj tshuaj tsuag, txhuam hniav, uas yuav pab ua kom tiav cov khaub ncaws hnav thiab du.
Los tiv thaiv kev ua tau zoo: Thaum cov tsho tiv no los yog xim pleev xim rau ntawm qhov chaw ntsug, sagging feem ntau tshwm sim hauv qab qhov nqus dej, ua rau muaj kev sib tsoo ntawm zaj nkauj, ua rau cov cim tsis sib xws thiab txawm tias muaj cov cim txaus. HPMC ua tau zoo rau kev ua raws li cov khoom sib txawv ntawm cov kab mob viscancos thiab ua kom muaj kev ruaj ntseg ntawm cov khoom siv ntsug.
Los tiv thaiv cov nyhuv: hauv cov xim pleev xim nrog cov xim ntau dua lossis sau cov pigments lossis cov pigments lossis cov pigent yog nquag mus rau cov txheej txheem kev sib tw, cuam tshuam rau cov khaub ncaws sib txawv ntawm cov txheej. HPMC qeeb qeeb cia cov sedimentation tus nqi ntawm cov khoom muaj los ntawm kev loj hlob ntawm cov kab mob viscosity ntawm lub system. Nyob rau tib lub sijhawm, nws tau tuav nws lub xeev ncua kev kawm nyob rau hauv cov xim los ntawm kev sib cuam tshuam nrog cov xim muaj zog thiab ua raws li lub sijhawm ua haujlwm.
Txhim kho cov chaw cia khoom ruaj khov: thaum lub sijhawm khaws cia, cov xim pleev xim rau qhov sib zog ua kom stratification, sib xyaws lossis kev ua kom txaj muag. Qhov kev sib txuas ntawm HPMC tuaj yeem txhim kho qhov chaw khaws khoom ruaj ntawm cov xim, yog li kev sib txawv ntawm lub neej thiab tsis muaj cov khoom lag luam zoo tshwm sim los ntawm kev tsis txaus siab.
3. Cov yam cuam tshuam rau viscosity tswj los ntawm HPMC
Cov siab: Cov concentration ntawm HPMC yog qhov ncaj qha cuam tshuam rau cov xim pleev xim rau lossis pleev xim. Raws li cov concentration ntawm HPMC nce, lub viscosity ntawm lub system yuav nce ntxiv. Rau cov txheej txheej uas yuav tsum tau viscosity, tsim nyog nce tus nqi HPMC tuaj yeem ua tiav cov qib viscosity zoo tshaj plaws. Txawm li cas los xij, siab dhau ib qho kev xav tau kuj tseem yuav ua rau lub kaw lus kom ua tau zoo thiab cuam tshuam kev ua haujlwm. Yog li ntawd, nws yog qhov tsim nyog los tswj tus nqi ntawm HPMC ntxiv raws li daim ntawv thov kev ua yeeb yam thiab kev tsim kho.
Molecular qhov hnyav: qhov hnyav molecular ntawm HPMC kuj tseem yog qhov tseem ceeb cuam tshuam rau viscosity. HPMC nrog lub siab molecular hnyav ua ib qho Denser Network qauv hauv kev daws teeb meem, uas tuaj yeem ua kom cov viscosity ntawm txheej; Thaum HPMC nrog cov khoom hnyav me me ntawm cov khoom pov thawj qis dua. Los ntawm xaiv HPMC nrog qhov hnyav molecular, lub viscosity ntawm txheej los yog xim tuaj yeem hloov kho kom tau raws li kev tsim kho cov kev tsim kho.
Qhov kub thiab txias: Lub viscosity ntawm HPMC txo qis nrog kev nce kub. Yog li ntawd, thaum tsim nyob rau hauv ib puag ncig kub ib puag ncig, nws yog ib qho tsim nyog los xaiv nws cov kev siv kub ua kom ntseeg tau tias qhov kev tsim kho thiab zaj duab xis nyob rau hauv qhov kub nyob rau hauv cov kev mob siab.
PE Tus nqi: HPMC yog ruaj khov nyob rau hauv ntau cov lus dav, tab sis cov xwm txheej acid thiab alkali yuav cuam tshuam nws viscosity kev ruaj ntseg. Nyob rau hauv ib tug muaj zog acid los yog alkali ib puag ncig, HPMC yuav thuam lossis swb, ua rau muaj kev txo qis hauv viscosity. Yog li ntawd, thaum tsim tus qauv, xyuas kom cov lej ntawm cov kab ke yog ib nrab los tswj lub viscosity tswj kev ua haujlwm ntawm HPMC.
Shear Tus Nqi: HPMC yog shear-thinning thickener, uas yog, nws viscosity yuav txo qis ntawm cov siab shear siab. Cov cuab yeej no tseem ceeb heev nyob rau hauv cov txheej txheem txheej txheem, vim hais tias thaum txhuam hniav, muab cov txheej txheem sib xyaw, thiab HPMC tuaj yeem txhim kho kev tsim kho kev ua haujlwm los ntawm kev txo cov viscosity. Tom qab kev tsim kho tiav, lub zog shear ploj, thiab HPMC tuaj yeem kho lub viscosity ntawm txheej los xyuas kom cov kev sib xws thiab tuab ntawm txheej yeeb yaj kiab.
4. Daim ntawv thov ntawm HPMC nyob rau hauv cov tshuab sib txawv
Cov dej pleev dej ua haujlwm: HPMC tau dav siv hauv cov dej pleev dej. Nws tsis tuaj yeem siv los ua tuab, tab sis kuj yog ua zaj duab xis-ua kev pab thiab stabilizer. Hauv cov tshuab dej-raws li, HPMC tuaj yeem ua rau muaj kuab paug ntawm txheej, txhim kho nws cov rheology thiab kev tiv thaiv kev ua yeeb yam thiab tsis txaus siab. Nyob rau tib lub sijhawm, nws kuj tseem tuaj yeem txhim kho cov dej tsis kam thiab txhuam kom tiv thaiv ntawm txheej zaj duab xis thiab nthuav tawm lub neej ntawm txheej.
Cov kuab tshuaj pleev xim: txawm hais tias HPMC tsis tshua tau siv nyob rau hauv cov kuab tshuaj pleev xim, nws tseem tuaj yeem siv los ua cov kev pab tuab thiab ntsuas kev pab. Tshwj xeeb tshaj yog nyob rau hauv cov khoom siv tsis tshua muaj zog (VOC) Txheej txheem, HPMC tuaj yeem muab qhov tsim nyog viscosity thiab rheology kho tau, yog li txo kev tiv thaiv kev tiv thaiv.
Cov hmoov txhuas hmoov: Hauv cov hmoov txheej ci, HPMC tuaj yeem siv los ua cov binder thiab thickener txhawm rau txhim kho cov khoom siv viscosity los ntawm cov hmoov. HPMC tuaj yeem ua kom paub tseeb tias cov hmoov hmoov tsis yooj yim ya thaum cov txheej txheem kev tsim kho, thaum txhim kho cov kev sib txuam thiab ntom ntawm txheej yeeb yaj kiab.
HPMC ua tiav zoo nkauj tua hauv lub tsho thiab cov xim pleev xim rau nws cov tshuaj thiab cov tshuaj lom neeg. Nws tsis tuaj yeem hloov kho qhov tseeb ntawm cov kab mob viscosity, tab sis kuj tseem txhim kho kev ntseeg ntawm txheej, txhim kho cov khoom los tiv thaiv thiab tiv thaiv kev ruaj khov. Raws li cov tshuab sib txawv thiab kev tsim kho cov kev tsim kho, ntawm kev hloov kho ntawm HPMC, yog li kev txhim kho cov kev tsim kho ntawm cov txheej txheem thiab cov txheej txheem kawg.
Lub Sijhawm Post: Sep-13-2024