Hydroxypropylmethylcellulose (HPMC) yog cov khoom siv sib xyaw ua ke uas tau siv dav hauv kev tsim kho kev lag luam. Nws yog dav siv nyob rau hauv daim ntawv thov putty vim nws txhim kho tag nrho cov kev ua tau zoo thiab zoo ntawm putty. Hauv tsab xov xwm no, peb yuav tshawb nrhiav cov ntawv thov ntawm HPMC hauv putty, txheeb xyuas cov teeb meem uas yuav tshwm sim thaum nws siv, thiab qhia qee cov lus qhia txog yuav ua li cas zam cov teeb meem no.
Ua ntej, cia peb saib ze dua ntawm cov yam ntxwv ntawm HPMC. Nws yog ib qho nonionic cellulose ether, soluble hauv dej thiab qee cov organic solvents. Nws cov qauv molecular tshwj xeeb muab nws zoo heev viscosity, dej tuav thiab cov khoom nplaum. Yog li ntawd, nws yog ib qho zoo tagnrho additive rau putty daim ntaub ntawv.
HPMC tuaj yeem siv ua cov thickener, binder thiab emulsifier hauv putty formulations. Nws muaj cov dej tuav zoo heev uas pab tiv thaiv putty los ntawm ziab sai heev. Nws kuj tseem txhim khu lub putty adhesion rau lub substrate, ua kom nws ruaj khov. Cov khoom no ua rau HPMC ib qho tseem ceeb muaj nyob rau hauv high-zoo putties.
Txawm li cas los xij, qee qhov teeb meem yuav tshwm sim thaum HPMC siv rau hauv putty. Thawj qhov teeb meem yog tias HPMC yog rhiab rau pH thiab kub hloov. Yog tias pH ntawm putty formulation yog acidic heev, nws yuav ua rau HPMC poob viscosity. Tib lub sijhawm, yog tias qhov kub thiab txias dhau, nws yuav ua rau HPMC degrade, uas yuav cuam tshuam rau kev ua haujlwm ntawm putty.
Lwm qhov teeb meem uas tuaj yeem tshwm sim yog clumping. Yog tias HPMC tsis sib xyaw zoo nrog rau lwm cov khoom xyaw hauv cov mis putty, nws tuaj yeem tsim cov clumps lossis clumps. Cov lumps no cuam tshuam qhov zoo ntawm putty, ua rau nws tsis du thiab nyuaj rau thov.
Txhawm rau zam cov teeb meem no, qee cov kev cai yooj yim yuav tsum tau ua thaum siv HPMC hauv Putty daim ntawv thov. Ua ntej, nws yog ib qho tsim nyog los xaiv hom HPMC tsim nyog rau kev tsim cov putty. Ntau hom HPMC tuaj yeem muaj cov yam ntxwv sib txawv, yog li hom raug yuav tsum raug xaiv rau ib daim ntawv thov tshwj xeeb.
Qhov thib ob, nws yog ib qho tseem ceeb kom sib xyaw HPMC nrog rau lwm cov khoom xyaw hauv cov txheej txheem putty. Qhov no yuav pab tiv thaiv cov pob los yog pob. Nws tseem yog ib qho tseem ceeb uas yuav tau siv cov txheej txheem sib xyaw kom raug los xyuas kom meej tias cov putty zoo sib xyaw.
Thib peb, xyuam xim rau pH thiab kub ntawm cov mis putty. Nws yog ib qho tseem ceeb kom ntseeg tau tias pH nyob rau hauv qhov kev pom zoo rau hom HPMC tshwj xeeb siv. Nws tseem yog ib qho tseem ceeb los saib xyuas cov qauv ntsuas kub thiab khaws cia rau hauv qhov kev pom zoo los tiv thaiv HPMC degradation.
Hauv cov ntsiab lus, HPMC yog ib qho tseem ceeb muaj nyob rau hauv high-quality putty formulations. Nws muab cov dej tuav zoo heev, adhesion thiab viscosity yam ntxwv uas tuaj yeem txhim kho tag nrho kev ua tau zoo thiab zoo ntawm putties. Txawm li cas los xij, qee qhov teeb meem yuav tshwm sim thaum nws siv, xws li rhiab heev rau pH thiab qhov kub thiab txias hloov, caking, thiab lwm yam. Los ntawm kev ua raws li qee qhov kev cai yooj yim thaum siv HPMC, cov teeb meem no tuaj yeem zam tau thiab cov khoom siv zoo tuaj yeem tau txais.
Post lub sij hawm: Lub Xya hli ntuj-27-2023