Hydroxypropyl methylcellulose (HPMC) yog cov dej-soluble non-ionic cellulose ether dav siv hauv cov khoom siv hauv tsev, tshuaj, khoom noj khoom haus, khoom tu tus kheej thiab txheej. Hauv kev lag luam txheej thiab xim, HPMC tau dhau los ua ib qho tseem ceeb ntxiv vim nws lub cev thiab tshuaj lom neeg tshwj xeeb. Nws lub luag haujlwm tseem ceeb yog ua cov thickener, stabilizer, zaj duab xis-tsim tus neeg saib xyuas thiab rheology tswj tus neeg saib xyuas txhawm rau txhim kho kev ua haujlwm, khaws cia ruaj khov thiab txheej txheej zoo ntawm cov coatings thiab xim.
1. Cov yam ntxwv tseem ceeb ntawm HPMC
HPMC yog cov khoom sib xyaw uas tau txais los ntawm kev hloov kho ntuj tsim cellulose. Nws muaj cov yam ntxwv ntawm lub cev thiab tshuaj lom neeg hauv qab no, ua rau nws siv dav hauv kev lag luam txheej thiab xim:
Dej solubility: HPMC muaj cov dej zoo solubility hauv dej txias, tsim cov kua nplaum pob tshab uas pab txhim kho cov viscosity ntawm cov xim.
Thermal gelability: Ntawm qhov kub thiab txias, HPMC yuav tsim cov gel thiab rov qab mus rau lub xeev cov tshuaj tom qab txias. Cov yam ntxwv no tso cai rau nws muab cov txheej txheem zoo dua hauv kev tsim kho tshwj xeeb.
Zoo zaj duab xis-forming zog: HPMC tuaj yeem tsim cov yeeb yaj kiab txuas ntxiv thaum cov xim dries, txhim kho qhov adhesion thiab durability ntawm txheej.
Stability: Nws muaj kev tiv thaiv siab rau cov kua qaub, hauv paus thiab electrolytes, ua kom ruaj khov ntawm cov txheej hauv qab sib txawv cia thiab siv cov xwm txheej.
2. Lub luag haujlwm tseem ceeb ntawm HPMC hauv kev lag luam txheej thiab xim
2.1 Thickener
Hauv cov txheej txheem kev lag luam, cov nyhuv thickening ntawm HPMC yog qhov tseem ceeb tshwj xeeb. Nws cov tshuaj muaj viscosity siab thiab zoo shear thinning zog, uas yog, thaum lub sij hawm stirring los yog painting txheej txheem, lub viscosity yuav txo tau ib ntus, yog li yooj yim rau kev tsim kho ntawm cov xim, thiab viscosity yuav sai sai rov qab tom qab kev tsim kho yog nres los tiv thaiv cov xim. los ntawm sagging. Cov cuab yeej no xyuas kom meej txawm tias daim ntawv thov txheej thiab txo sagging.
2.2 Rheology tswj
HPMC muaj qhov cuam tshuam loj heev rau rheology ntawm txheej txheej. Nws tuav cov viscosity kom zoo ntawm cov txheej thaum khaws cia thiab tiv thaiv cov coatings los ntawm delaminating lossis daws. Thaum lub sij hawm thov, HPMC muab cov cuab yeej tsim nyog los pab cov xim xaum sib npaug ntawm daim ntawv thov nto thiab tsim cov txheej txheem du. Tsis tas li ntawd, nws cov cuab yeej shear thinning tuaj yeem txo cov txhuam txhuam los yog yob cov cim uas tsim thaum lub sij hawm daim ntawv thov txheej txheem thiab txhim kho cov tsos zoo ntawm cov zaj duab xis zaum kawg.
2.3 Film-forming agent
Cov khoom ua yeeb yaj kiab ntawm HPMC pab txhim kho cov adhesion thiab zaj duab xis lub zog ntawm cov txheej. Thaum lub sij hawm ziab, zaj duab xis tsim los ntawm HPMC muaj qhov zoo toughness thiab elasticity, uas tuaj yeem txhim kho qhov tawg tsis kam thiab hnav tsis kam ntawm cov txheej, tshwj xeeb tshaj yog nyob rau hauv qee qhov kev thov siv txheej txheej, xws li nkoj, tsheb, thiab lwm yam., HPMC zaj duab xis-forming zog tuaj yeem txhim kho qhov ua tau zoo ntawm cov txheej txheem.
2.4 Stabilizer
Raws li ib tug stabilizer, HPMC tuaj yeem tiv thaiv nag lossis daus ntawm pigments, fillers thiab lwm yam khoom hauv cov txheej txheem txheej txheej, yog li txhim kho qhov ruaj khov ntawm cov txheej txheem. Qhov no yog tshwj xeeb tshaj yog tseem ceeb rau cov txheej txheem dej. HPMC tuaj yeem cuam tshuam kev delamination lossis agglomeration ntawm txheej thaum khaws cia thiab ua kom cov khoom zoo sib xws nyob rau lub sijhawm ntev cia.
3. Kev thov ntawm HPMC hauv cov txheej txheem sib txawv
3.1 Cov txheej txheem dej
Cov dej-raws li cov txheej txheem tau txais kev saib xyuas ntau nyob rau xyoo tas los no vim lawv qhov kev nyab xeeb ntawm ib puag ncig thiab tsis tshua muaj hluav taws xob organic compound (VOC) emissions. HPMC yog siv dav hauv cov txheej txheem dej. Raws li cov thickener thiab stabilizer, HPMC tuaj yeem txhim kho qhov ruaj khov thiab ua haujlwm tau zoo ntawm cov txheej txheem dej. Nws muab kev tswj xyuas zoo heev hauv qhov chaw qis lossis kub siab, ua rau cov xim zoo dua thaum txau, txhuam los yog dov.
3.2 Latex xim
Latex xim yog ib qho ntawm feem ntau siv architectural txheej niaj hnub no. HPMC yog siv los ua rheology tswj tus neeg saib xyuas thiab cov thickener hauv cov xim latex, uas tuaj yeem kho cov viscosity ntawm cov xim latex, txhim kho nws cov kis tau, thiab tiv thaiv cov xim zaj duab xis los ntawm sagging. Tsis tas li ntawd, HPMC muaj kev tswj xyuas zoo dua rau kev tawg ntawm cov xim latex thiab tiv thaiv cov xim ntawm cov khoom los ntawm kev sib haum xeeb lossis kev sib cais thaum lub sijhawm khaws cia.
3.3 Roj-raws li xim
Txawm hais tias daim ntawv thov ntawm cov roj-raws li cov txheej txheem tau txo qis niaj hnub no nrog cov kev cai tiv thaiv ib puag ncig, lawv tseem siv dav hauv qee qhov kev lag luam tshwj xeeb, xws li hlau tiv thaiv txheej. HPMC ua raws li tus neeg sawv cev ncua thiab rheology tswj tus neeg sawv cev hauv cov roj-raws li txheej los tiv thaiv cov xim xim thiab pab cov txheej txheem kom zoo dua qib thiab adhesion thaum siv.
4. Yuav siv thiab npaum li cas ntawm HPMC
Tus nqi ntawm HPMC siv rau hauv cov txheej txheem feem ntau yog txiav txim siab los ntawm hom txheej txheej thiab cov ntawv thov tshwj xeeb. Feem ntau hais lus, qhov sib ntxiv ntawm HPMC feem ntau yog tswj hwm ntawm 0.1% thiab 0.5% ntawm tag nrho cov txheej txheej. Txoj kev ntxiv yog feem ntau ncaj qha qhuav hmoov ntxiv los yog npaj ua ntej thiab tom qab ntawd ntxiv. Lub solubility thiab viscosity hloov cov nyhuv ntawm HPMC yog cuam tshuam los ntawm kub, dej zoo thiab nplawm tej yam kev mob. Yog li ntawd, txoj kev siv yuav tsum tau kho raws li cov txheej txheem tiag tiag.
Hydroxypropyl methylcellulose (HPMC) yog siv los ua cov thickener, rheology tswj tus neeg saib xyuas, tus neeg sawv cev ua yeeb yaj kiab thiab stabilizer hauv cov txheej txheem thiab cov xim, txhim kho kev tsim kho kev ua tau zoo, kev ruaj khov thiab cov txheej txheem kawg ntawm cov txheej txheem. zoo. Nrog rau kev txhawb nqa cov txheej txheem ib puag ncig thiab kev xav tau ntawm kev ua lag luam ntau ntxiv rau cov txheej txheem ua haujlwm siab, HPMC yuav txuas ntxiv ua lub luag haujlwm tseem ceeb hauv cov txheej txheem kev lag luam yav tom ntej. Los ntawm kev siv HPMC qhov tsim nyog, cov khoom siv lub cev thiab tshuaj lom neeg ntawm cov txheej txheem tuaj yeem txhim kho tau zoo, thiab kev ua haujlwm ntev thiab zoo nkauj ntawm cov txheej tuaj yeem txhim kho.
Post lub sij hawm: Sep-13-2024