Cov viscosity index ntawmhydroxypropyl methylcelluloseyog ib qho ntsuas tseem ceeb heev. Qhov viscosity tsis sawv cev rau qhov purity. Qhov viscosity ntawm cellulose HPMC nyob ntawm cov txheej txheem ntau lawm. Cov chaw siv sib txawv yuav tsum xaiv cellulose HPMC nrog cov viscosities sib txawv, tsis yog qhov viscosity ntawm cellulose HPMC siab dua, qhov zoo dua! Qhov yog yog qhov yog √
Kev Tswj Xyuas Qhov Ntsws
1. Cov hydroxypropyl methylcellulose uas muaj viscosity siab heev tsis tuaj yeem tsim cov cellulose uas muaj viscosity siab heev tsuas yog los ntawm kev nqus tsev thiab hloov nrog nitrogen. Feem ntau, kev tsim cov cellulose uas muaj viscosity siab hauv Suav teb tsis tuaj yeem tswj tau. Txawm li cas los xij, yog tias lub cuab yeej ntsuas pa oxygen tuaj yeem ntsia tau rau hauv lub lauj kaub, kev tsim cov viscosity tuaj yeem tswj tau yam tsis muaj kev txawj ntse.
Kev siv cov neeg sawv cev sib koom tes
2. Ntxiv rau, xav txog qhov hloov pauv ntawm nitrogen, thiab tib lub sijhawm, nws yooj yim heev rau kev tsim cov khoom muaj viscosity siab tsis hais lub kaw lus airtight li cas. Tau kawg, qib ntawm polymerization ntawm cov paj rwb refined kuj tseem ceeb heev. Yog tias qhov ntawd tsis ua haujlwm, ua nws los ntawm hydrophobic koom haum. Muaj cov neeg sawv cev koom tes hauv tsev hauv qhov no. Hom neeg sawv cev koom tes twg raug xaiv muaj kev cuam tshuam loj rau kev ua tau zoo ntawm cov khoom kawg.
Cov ntsiab lus ntawm Hydroxypropyl
3. Cov pa oxygen seem hauv lub reactor ua rau kev puas tsuaj ntawm cellulose thiab txo qhov hnyav molecular, tab sis cov pa oxygen seem yog txwv. Nws tsis nyuaj rau ua kom muaj viscosity siab ntev li ntev tau cov molecules tawg rov txuas dua. Txawm li cas los xij, qhov dej saturation tus nqi kuj tseem muaj feem cuam tshuam nrog cov ntsiab lus ntawm hydroxypropyl. Qee lub Hoobkas tsuas yog xav txo tus nqi thiab tus nqi, thiab tsis kam nce cov ntsiab lus ntawm hydroxypropyl, yog li qhov zoo tsis tuaj yeem ncav cuag qib ntawm cov khoom txawv teb chaws zoo sib xws.
lwm yam tseem ceeb
4. Tus nqi khaws dej ntawm cov khoom muaj kev sib raug zoo heev nrog hydroxypropyl, tab sis rau tag nrho cov txheej txheem tshuaj tiv thaiv, nws kuj txiav txim siab nws tus nqi khaws dej, qhov cuam tshuam ntawm alkalization, qhov piv ntawm methyl chloride thiab propylene oxide, thiab qhov concentration ntawm alkali. Thiab qhov piv ntawm dej rau paj rwb zoo txiav txim siab qhov ua tau zoo ntawm cov khoom.
Lub sijhawm tshaj tawm: Lub Kaum Hli-19-2022