HPMC (HydroxyPropal Metylcellulose) yog ib txwm siv polymer cov khoom siv dav siv dav siv hauv kev tsim kho, tshuaj, tshuaj noj, khoom noj txhua hnub thiab lwm thaj teb. Raws li nws solubility hauv dej, nws tuaj yeem faib ua dej txias tam sim thiab kub qhuav hom. Muaj ntau qhov sib txawv hauv cov txheej txheem ntau lawm ntawm ob hom HPMC.
(1), kev ua haujlwm ua haujlwm
1. Cov dej txias tam sim no
Hauv cov txheej txheem ntau lawm ntawm dej txias tam sim HPMC, cov ntaub ntawv raw ua ntej yuav tsum tau ua ntej. Cov khoom siv raw feem ntau suav nrog cellulose, propylene oxide yuav tsum tau ua kom huv si thiab lwm yam thaum lub sijhawm ua haujlwm tsis zoo thiab muaj kev sib xyaw ua cov tshuaj tiv thaiv. Tshwj xeeb, kev kho mob ntawm cellulose yuav tsum tau ua kom qhuav thiab ua kom tiav qhov tsim nyog particle loj.
2. KUB qhuavt hom
Kub-yaj HPMC zoo sib xws rau cov dej txias Vim tias kub-yaj HPMC yuav tsum tau ua kom hnov mob kub thiab kub thiab particle thiab cellulose loj dua rau cov txheej txheem kev tshuaj tiv thaiv. Nws yog feem ntau tsim nyog siv high-purity cellulose, thiab qhov loj me me yuav tsum tau nruj me ntsis tswj tau thaum lub sij hawm crushing.
(2), synthesis cov tshuaj tiv thaiv
1. Cov dej txias tam sim no
Cov tshuaj tiv thaiv synthesis ntawm cov dej txias tam sim no HPMC feem ntau nqa tawm ntawm qhov kub tsawg, feem ntau tswj ntawm 20-50 degrees Celsius. Thaum lub sij hawm cov txheej txheem kev tshuaj tiv thaiv, cellulose yog thawj zaug ua ntej nyob rau hauv alkaline cov kev mob rau ib nrab ntawm cov xov tooj ntawm cov xov tooj thiab tsim cov pab pawg hydroxyl dawb. Tom qab ntawd, reactants xws li Methanol, propylene oxide thiab methyl chloride tau ntxiv rau hauv cov kev cuam tshuam rau kev ua kom muaj kev tiv thaiv kab mob herherification. Tag nrho cov tshuaj tiv thaiv yuav tsum tau tswj qhov kub thiab yog PH kom ntseeg tau tias qhov kev sib txuam thiab kev ruaj khov ntawm cov khoom.
2. KUB qhuavt hom
Cov tshuaj tiv thaiv synthesis ntawm kub-yaj HPMC yog nqa tawm ntawm qhov kub, feem ntau 50-80 degrees Celsius lossis tseem siab dua. Cov txheej txheem kev tshuaj tiv thaiv zoo ib yam li cov dej txias tam sim ntawd, tab sis vim qhov ntsuas kub sai, ntsuas kub ntau dua qhov ntsuas tau. Thaum muaj kub kub, cov hydrolysis thiab etherification ntawm cellulose tau ua tiav ntau dua, thiab cov roj ntsha molecular cia cov khoom lag luam yog ntau yam kev hnav khaub ncaws.
(3) Cov txheej txheem tom qab ua
1. Cov dej txias tam sim no
Tom qab synthesis cov tshuaj tiv thaiv ntawm dej txias tam sim HPMC tiav lawm, yog cov txheej txheem tom qab ua tiav. Qhov thib ib yog qhov kev cuam tshuam nruab nrab rau nruab nrab cov tshuaj yeeb yaj kiab hauv cov tshuaj sib xyaw. Kev lim dej thiab ntxuav yog tom qab ntawd ua kom tshem tawm cov khoom siv raw thiab cov khoom lag luam. Kauj ruam kawg yog ziab thiab pulverizing. Cov khoom tau qhuav los tswj cov ntsiab lus noo noo, thiab tom qab ntawd pullied rau ib qho loj particle loj kom tau cov khoom tiav HPMC.
2. KUB qhuavt hom
Cov txheej txheem kev kho mob tom qab ntawm kub-yaj HPMC yog ib qho zoo sib xws rau ntawm cov dej txias-dej tam sim no HPMC. Txawm li cas los xij, vim qhov ntsuas kub siab tau siv hauv cov txheej txheem tshuaj tiv thaiv, cov ntsiab lus ya raws ntawm cov khoom yog tsawg thiab cov txheej txheem kom qhuav yog yooj yim. Tsis tas li ntawd, kub-yaj HPMC yuav tsum tau them ntau dua rau tswj hwm qhov tsoo kub thaum lub sijhawm ua haujlwm los tiv thaiv kev ua haujlwm vim qhov kub thiab txias.
(4), ua tau zoo thiab thov
Dej txias Instant HPMC tau siv dav hauv cov teb uas yuav tsum tau ua yeeb yaj kiab nrawm nrawm, xws li ua yeeb yaj kiab archings, emulsions, thiab lwm yam kev sib cais hauv dej txias. Nws cov txheej txheem ntau lawm yuav tsum muaj siab ntau, tshwj xeeb yog kev tswj hwm ntawm cov tshuaj tiv thaiv kev kub ntxhov.
Hot-yaj HPMC yog qhov tsim nyog rau cov kev siv nyob rau hauv cov kev mob siab, xws li cov hmoov av ntau, ua rau nws cov hmoov av kub. Nws cov txheej txheem ntau lawm yog qhov yooj yim, tab sis nws muaj qhov muaj txiaj ntsig zoo ntawm kev huv huv ntawm cov khoom siv raw thiab cov tshuaj tiv thaiv kub.
Qhov sib txawv tseem ceeb hauv cov txheej txheem ntau lawm ntawm cov dej txias heev ntawm qhov sib txawv ntawm cov khoom siv kub, uas cuam tshuam nrog cov txheej txheem sib txawv, cov txheej txheem tom qab kev kho mob. Cov dej txias tam sim no yuav tsum tau ua kom muaj qhov kub thiab txias thiab muaj qhov kub thiab txias thiab them ntau dua Ob kuj tseem sib txawv hauv cov ntawv thov cov ntawv thov, thiab txhua lub luag haujlwm tseem ceeb.
Lub Sijhawm Post: Feb-17-2025