Hydroxypropyl methylcellulose yuav luag insoluble nyob rau hauv kiag li ethanol thiab acetone. Cov tshuaj aqueous yog ruaj khov heev ntawm chav tsev kub thiab tuaj yeem gel ntawm qhov kub thiab txias. Feem ntau ntawm hydroxypropyl methylcellulose nyob rau hauv kev ua lag luam tam sim no belongs rau cov dej txias (chav dej kub, kais dej) instant hom. Cov dej txias tam sim HPMC yuav yooj yim dua thiab siv tau zoo dua. HPMC yuav tsum tau ncaj qha ntxiv rau cov dej txias tom qab kaum mus rau cuaj caum feeb kom maj mam thicken. Yog tias nws yog ib qho qauv tshwj xeeb, nws yuav tsum tau nplawm nrog dej kub kom tawg, thiab muab tso rau hauv dej txias kom yaj tom qab txias.
Thaum HPMC cov khoom raug muab tso ncaj qha rau hauv dej, lawv yuav coagulate thiab tom qab ntawd yaj, tab sis qhov kev sib cais no qeeb heev thiab nyuaj. Peb txoj kev sib cais hauv qab no raug pom zoo, thiab cov neeg siv tuaj yeem xaiv txoj kev yooj yim tshaj plaws raws li qhov xwm txheej siv (tsuas yog rau cov dej txias tam sim HPMC).
Dissolving txoj kev thiab ceev faj ntawm HPMC
1. Txoj kev dej txias: Thaum nws yuav tsum tau ncaj qha ntxiv rau qhov kub thiab txias aqueous tov, nws yog qhov zoo tshaj plaws los siv hom dej txias dispersion. Tom qab ntxiv cov viscosity, qhov sib xws yuav maj mam nce mus rau qhov ntsuas qhov xav tau.
2. Powder mixing method: HPMC hmoov thiab tib tus nqi lossis ntau dua ntawm lwm cov hmoov sib xyaw ua ke tag nrho los ntawm kev sib xyaw qhuav, thiab tom qab ntxiv dej kom yaj, HPMC tuaj yeem yaj nyob rau lub sijhawm no thiab yuav tsis muaj agglomerate ntxiv lawm. Qhov tseeb, tsis muaj teeb meem dab tsi ntawm hydroxypropyl methylcellulose. Nws tuaj yeem qhuav sib xyaw ncaj qha rau hauv lwm cov ntaub ntawv.
3. Organic solvent wetting method: HPMC yog pre-dispersed los yog wetted nrog organic solvents, xws li ethanol, ethylene glycol los yog roj, thiab ces yaj nyob rau hauv dej, thiab HPMC kuj yuav yaj smoothly.
Thaum lub sij hawm dissolution txheej txheem, yog hais tias muaj agglomeration, nws yuav muab qhwv. Qhov no yog qhov tshwm sim ntawm kev sib tw tsis sib xws, yog li nws yog ib qho tsim nyog yuav tsum ua kom nrawm nrawm nrawm. Yog hais tias muaj npuas nyob rau hauv lub dissolution, nws yog vim huab cua tshwm sim los ntawm uneven stirring, thiab cov tshuaj raug tso cai sawv ntsug rau 2-12 teev (lub sij hawm tshwj xeeb nyob ntawm qhov sib xws ntawm cov tshuaj) los yog nqus, pressurization thiab lwm txoj kev. tshem tawm, ntxiv tus nqi tsim nyog ntawm defoamer tuaj yeem tshem tawm qhov xwm txheej no. Ntxiv qhov tsim nyog ntawm defoamer tuaj yeem tshem tawm qhov xwm txheej no.
Txij li thaum hydroxypropyl methylcellulose yog siv nyob rau hauv ntau yam kev lag luam, nws yog ib qho tseem ceeb heev rau tus tswv txoj kev dissolution ntawm hydroxypropyl methylcellulose rau nws siv kom raug. Tsis tas li ntawd, cov neeg siv tau ceeb toom kom ua tib zoo saib xyuas lub hnub tiv thaiv, tiv thaiv los nag thiab tiv thaiv ya raws thaum siv, zam lub teeb ncaj qha, thiab khaws cia rau hauv qhov chaw kaw thiab qhuav. Tsis txhob sib cuag nrog cov khoom siv hluav taws xob thiab zam kev tsim cov hmoov av ntau hauv qhov chaw kaw kom tsis txhob muaj kev phom sij tawg.
Post lub sij hawm: Jun-20-2023