Hydroxypropyl methylcellulose (HPMC)yog cov dej-soluble polymer cov khoom siv dav siv hauv tshuaj, kev tsim kho, khoom noj khoom haus, tshuaj pleev ib ce thiab lwm yam. Nws cov cuab yeej viscosity yog qhov tseem ceeb rau ntsuas nws tus cwj pwm rheological nyob rau hauv ib puag ncig sib txawv. Kev nkag siab txog cov cuab yeej viscosity ntawm HPMC aqueous tov pab peb nkag siab zoo dua nws tus cwj pwm thiab kev ua haujlwm hauv ntau daim ntawv thov.
1. Cov qauv tshuaj thiab cov khoom ntawm HPMC
HPMC yog tau los ntawm kev hloov kho tshuaj ntawm natural cellulose, feem ntau yog tsim los ntawm hydroxypropylation thiab methylation ntawm cellulose molecules. Hauv cov qauv tshuaj ntawm HPMC, kev qhia txog methyl (-OCH₃) thiab hydroxypropyl (-OCH₂CHOHCH₃) pawg ua rau nws cov dej-soluble thiab muaj peev xwm hloov kho viscosity zoo. Lub viscosity kev ua tau zoo ntawm nws cov tshuaj aqueous ntawm ntau qhov sib txawv thiab qhov kub thiab txias yog cuam tshuam los ntawm ntau yam xws li qhov hnyav molecular, qib kev hloov pauv, kev daws teeb meem, thiab lwm yam.
2. Kev sib raug zoo ntawm viscosity thiab concentration
Lub viscosity ntawm AnxinCel®HPMC aqueous tov feem ntau nce nrog nce concentration. Qhov no yog vim hais tias ntawm cov concentrations ntau dua, kev sib cuam tshuam ntawm cov molecules yog txhim kho, ua rau muaj zog txaus. Txawm li cas los xij, cov yam ntxwv solubility thiab viscosity ntawm HPMC hauv dej kuj cuam tshuam los ntawm qhov hnyav molecular. HPMC nrog qhov hnyav molecular feem ntau pom muaj viscosity siab dua, thaum qhov hnyav molecular tsawg kuj tsawg.
Ntawm qhov tsis tshua muaj siab: HPMC cov tshuaj pom cov viscosity qis dua ntawm qhov qis dua (xws li qis dua 0.5%). Lub sijhawm no, kev sib cuam tshuam ntawm cov molecules tsis muaj zog thiab fluidity yog qhov zoo. Nws feem ntau yog siv rau hauv daim ntawv thov xws li txheej thiab tshuaj tiv thaiv kev tso tawm.
Nyob rau hauv siab concentrations: ntawm ntau dua concentrations (xws li 2% los yog siab dua), lub viscosity ntawm HPMC aqueous kua nce ho, uas qhia cov khoom zoo ib yam li cov tshuaj colloidal. Nyob rau lub sijhawm no, lub fluidity ntawm cov tshuaj yog raug rau ntau dua kuj.
3. Kev sib raug zoo ntawm viscosity thiab kub
Lub viscosity ntawm HPMC aqueous tov yog rhiab heev rau qhov kub thiab txias. Raws li qhov kub thiab txias, qhov txav ntawm cov dej molecules nce, thiab kev sib cuam tshuam ntawm HPMC molecules yuav qaug zog, ua rau txo qis hauv viscosity. Cov yam ntxwv no ua rau daim ntawv thov ntawm HPMC ntawm qhov sib txawv ntawm qhov kub thiab txias qhia tias muaj zog adjustability. Piv txwv li, nyob rau hauv qhov kub thiab txias, qhov viscosity ntawm HPMC feem ntau txo qis, uas yog ib qho tseem ceeb nyob rau hauv cov txheej txheem tshuaj, tshwj xeeb tshaj yog nyob rau hauv cov tshuaj tiv thaiv kev tso tawm cov ntaub ntawv, qhov kub hloov yuav cuam tshuam rau stability thiab cov nyhuv ntawm cov tshuaj.
4. Cov nyhuv pH ntawm viscosity
Lub viscosity ntawm HPMC aqueous tov kuj yuav cuam tshuam los ntawm pH tus nqi ntawm cov tshuaj. Txawm hais tias HPMC yog ib yam khoom uas tsis yog-ionic, nws cov dej hydrophilicity thiab viscosity feem ntau cuam tshuam los ntawm cov qauv molecular thiab kev daws teeb meem ib puag ncig. Txawm li cas los xij, nyob rau hauv cov kua qaub los yog alkaline heev, cov solubility thiab molecular qauv ntawm HPMC yuav hloov, yog li cuam tshuam rau viscosity. Piv txwv li, nyob rau hauv acidic tej yam kev mob, lub solubility ntawm HPMC tej zaum yuav tsis muaj zog me ntsis, ua rau muaj zog viscosity; Thaum nyob rau hauv alkaline tej yam kev mob, lub hydrolysis ntawm ib co HPMC tej zaum yuav ua rau nws molecular hnyav txo, yog li txo nws viscosity.
5. Molecular Luj thiab viscosity
Molecular hnyav yog ib qho tseem ceeb cuam tshuam rau viscosity ntawm HPMC aqueous tov. Qhov hnyav dua molecular nce qhov kev sib txuas thiab kev sib txuas ntawm cov molecules, ua rau muaj viscosity. Tsawg molecular phaus AnxinCel®HPMC muaj cov dej solubility zoo dua hauv dej thiab qis dua viscosity. Cov ntawv thov sib txawv feem ntau xav tau kev xaiv ntawm HPMC nrog qhov sib txawv molecular hnyav. Piv txwv li, nyob rau hauv coatings thiab adhesives, siab molecular hnyav HPMC feem ntau yog xaiv kom zoo adhesion thiab fluidity; thaum nyob rau hauv kev npaj tshuaj, tsis tshua muaj molecular hnyav HPMC yuav raug siv los tswj tus nqi tso tawm ntawm cov tshuaj.
6. Kev sib raug zoo ntawm tus nqi shear thiab viscosity
Lub viscosity ntawm HPMC aqueous tov feem ntau hloov nrog tus nqi shear, uas qhia tus cwj pwm pseudoplastic rheological. Pseudoplastic kua yog cov kua dej uas nws viscosity maj mam txo nrog qhov nce ntawm shear npaum li cas. Cov yam ntxwv no ua rau HPMC kev daws teeb meem kom muaj viscosity siab ntawm qhov qis shear thaum siv, thiab txhim kho fluidity ntawm ntau dua shear tus nqi. Piv txwv li, hauv kev lag luam txheej, HPMC cov tshuaj feem ntau yuav tsum tau ua kom pom cov viscosity siab dua ntawm qhov qis qis thaum siv los xyuas kom meej qhov adhesion thiab leveling ntawm txheej, thaum lub sij hawm tsim kho, nws yog ib qho tsim nyog yuav tsum tau nce tus nqi shear kom nws muaj dej ntau.
7. Daim ntawv thov thiab viscosity yam ntxwv ntawm HPMC
Cov yam ntxwv viscosity ntawmHPMCua kom nws siv dav hauv ntau qhov chaw. Piv txwv li, hauv kev lag luam tshuaj, HPMC feem ntau yog siv los ua cov tshuaj tiv thaiv-tso tawm, thiab nws cov kev cai viscosity yog siv los tswj tus nqi tso tawm ntawm cov tshuaj; nyob rau hauv kev tsim kho kev lag luam, HPMC yog siv los ua cov thickener los txhim kho kev ua hauj lwm thiab fluidity ntawm mortar thiab adhesives; Hauv kev lag luam khoom noj khoom haus, HPMC tuaj yeem siv los ua cov thickener, emulsifier thiab stabilizer los txhim kho cov saj thiab cov tsos ntawm cov zaub mov.
Cov yam ntxwv viscosity ntawm AnxinCel®HPMC aqueous tov yog tus yuam sij rau nws daim ntawv thov hauv ntau qhov chaw. Nkag siab txog nws txoj kev sib raug zoo nrog rau yam xws li concentration, kub, pH, molecular yuag thiab shear tus nqi yog qhov tseem ceeb heev rau optimizing cov khoom ua tau zoo thiab txhim kho daim ntawv thov cuam tshuam.
Post lub sij hawm: Jan-27-2025