1. Txheej txheem cej luam ntawm HPMC
Hydroxypropyl methylcellulose (HPMC luv luv) yog cov khoom siv ntuj tsim, siv dav hauv kev tsim kho, txheej, tshuaj, khoom noj thiab lwm yam. HPMC yog tau los ntawm kev hloov kho tshuaj ntawm natural cellulose, muaj dej solubility thiab biocompatibility, thiab yog insoluble nyob rau hauv organic solvents. Vim nws cov dej solubility zoo heev, adhesion, thickening, ncua kev kawm ntawv thiab lwm yam khoom, HPMC tau dav siv nyob rau hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov ntawm putty hmoov.
2. Lub luag hauj lwm ntawm HPMC nyob rau hauv putty hmoov
Putty hmoov yog cov khoom siv hauv tsev siv rau kev kho cov phab ntsa, thiab nws cov khoom tseem ceeb yog cov fillers thiab binders. HPMC, raws li ib tug ntau thickener thiab dej-retaining agent, tuaj yeem txhim kho kev ua tau zoo ntawm cov hmoov putty, tshwj xeeb nrog rau cov hauv qab no:
Cov nyhuv Thickening: HPMC tsim cov tshuaj colloidal tom qab yaj hauv dej, uas muaj cov nyhuv thickening, tuaj yeem txhim kho cov khoom siv rheological ntawm putty hmoov, ua kom nws muaj viscosity tsim nyog, zam dhau nyias thaum thov, thiab txhim kho kev nplij siab ntawm kev ua haujlwm.
Txhim kho kev tsim kho: HPMC cov nyhuv thickening tuaj yeem tsis tsuas yog ua rau cov hmoov putty tsis tshua muaj sag los yog drip thaum lub sij hawm daim ntawv thov, tab sis kuj txhim khu lub adhesion ntawm putty hmoov, ua rau nws yooj yim mus thov rau phab ntsa, yog li txhim kho kev tsim kho efficiency.
Txhim kho cov dej tuav: HPMC tuaj yeem khaws cov dej hauv cov hmoov hmoov thiab ua kom cov dej ntws qeeb. Qhov no tuaj yeem tiv thaiv qhov chaw ntawm putty hmoov los ntawm kev ziab sai heev, xyuas kom nws ua haujlwm tau zoo thaum siv, thiab tsis txhob tawg thiab tawg.
Txhim kho qhov kov thiab qhov smoothness: HPMC tsis tuaj yeem txhim kho cov ductility ntawm cov hmoov putty, tab sis kuj txhim kho nws qhov chaw tiaj tus, ua rau cov txheej txheej putty smoother, uas yog qhov tsim nyog rau kev ua haujlwm tom qab tha xim. Thaum lub sij hawm tsim kho, HPMC tuaj yeem muab kev ua kom zoo dua qub thiab txo qhov tsim ntawm qhov tsis xws luag thiab npuas.
Txhim kho kev txhim kho kev ruaj ntseg: Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho cov nag lossis daus ntawm cov hmoov putty, tiv thaiv cov khoom zoo hauv nws, thiab xyuas kom meej tias qhov zoo thiab kev ua tau zoo ntawm cov hmoov putty yuav tsis hloov pauv thaum lub sij hawm ntev cia.
Txhim kho kev sib tsoo: Los ntawm cov dej tuav thiab cov nyhuv thickening ntawm HPMC, qhov tawg tsis kam ntawm cov hmoov putty tuaj yeem txhim kho, cov kab nrib pleb ntawm phab ntsa tuaj yeem zam tau, thiab kev pabcuam lub neej tuaj yeem txuas ntxiv.
3. Haum viscosity ntawm HPMC
Cov nyhuv ntawm HPMC hauv putty hmoov yog ze ze rau nws cov viscosity. Kev xaiv ntawm viscosity yuav tsum tau txiav txim siab raws li cov kev cai tshwj xeeb ntawm putty hmoov thiab ib puag ncig kev tsim kho. Feem ntau hais lus, qhov viscosity ntawm HPMC muaj nyob ntawm ntau pua mus rau kaum tawm txhiab millipoise (mPa·s), ntawm cov viscosities sib txawv yog haum rau ntau hom putty hmoov thiab kev tsim kho.
Tsawg viscosity HPMC (txog 1000-3000 mPa·s): haum rau lub teeb yuag putty hmoov los yog lub hauv paus putty, feem ntau yog siv nyob rau hauv cov xwm txheej uas yuav tsum tau fluidity ntau dua. Tsawg viscosity HPMC tuaj yeem muab cov txheej txheem zoo dua, ua cov hmoov putty yooj yim rau kev khiav lag luam, tab sis cov dej tuav thiab tawg kuj tsis muaj zog.
Nruab nrab viscosity HPMC (kwv yees li 3000-8000 mPa·s): haum rau feem ntau cov qauv putty hmoov, uas tuaj yeem muab cov dej tuav tau zoo thiab tiv thaiv nag lossis daus thaum tuav cov kua dej zoo. HPMC ntawm qhov viscosity no tuaj yeem ua tsis tau tsuas yog ua tau raws li cov txheej txheem txheej txheem thaum tsim kho, tab sis kuj tseem tiv thaiv cov teeb meem xws li tawg thiab poob.
High viscosity HPMC (kwv yees li 8000-20000 mPa·s): haum rau cov txheej tuab ntawm cov hmoov putty lossis qee zaus yuav tsum muaj cov nyhuv thickening. High viscosity HPMC tuaj yeem muab cov txheej txheej zoo dua qub thiab ruaj khov, thiab tsim nyog rau cov ntawv thov txheej uas yuav tsum tau muaj zog kov thiab smoothness, tab sis nws yuav tsum tau muab sau tseg tias viscosity siab dhau lawm yuav ua rau cov hmoov putty muaj kuab heev thiab cuam tshuam rau kev tsim kho.
Hauv kev siv cov tswv yim, qhov tsim nyog HPMC viscosity yuav tsum raug xaiv raws li kev siv scenario thiab kev tsim kho ntawm cov hmoov putty. Piv txwv li, thaum lub phab ntsa saum npoo yog qhov ntxhib los yog ntau qhov kev tsim kho, yuav tsum muaj viscosity ntau dua HPMC tuaj yeem xaiv los txhim kho qhov adhesion thiab tawg tsis kam ntawm txheej; thaum nyob rau hauv lub sijhawm uas xav tau ntau dua fluidity thiab kev tsim kho sai dua, qis rau nruab nrab viscosity HPMC tuaj yeem xaiv.
Hydroxypropyl methylcellulose yog sivyog ib qho tseem ceeb hauv tsev ntxiv uas tuaj yeem txhim kho kev tsim kho kev ua tau zoo, tuav dej, adhesion thiab tawg tsis kam ntawm putty hmoov. Xaiv txoj cai HPMC viscosity yog qhov tseem ceeb rau kev siv cov hmoov putty. Cov viscosities sib txawv tuaj yeem hloov kho raws li hom putty hmoov, ib puag ncig kev tsim kho, thiab kev ua tau zoo. Hauv kev tsim khoom thiab kev tsim kho tiag tiag, tswj cov viscosity ntawm HPMC tuaj yeem ua tiav cov txiaj ntsig kev tsim kho thiab kev ua haujlwm ntev. Yog li, raws li kev tsim kho sib txawv, xaiv thiab kho cov viscosity ntawm HPMC yog ib kauj ruam tseem ceeb los xyuas kom meej qhov ua tau zoo thiab zoo ntawm cov hmoov putty.
Lub sij hawm xa tuaj: Mar-25-2025