Lub viscosity index ntawmHydroxypropyl methylcellulose yog tsim los ntawm cov tshuajyog ib qho tseem ceeb heev index. Lub viscosity tsis sawv cev rau purity. Lub viscosity ntawm cellulose HPMC nyob ntawm cov txheej txheem ntau lawm. Kev siv sib txawv yuav tsum xaiv cellulose HPMC nrog cov viscosities sib txawv, tsis yog qhov siab dua ntawm cellulose HPMC, qhov zoo dua! Dab tsi yog qhov yog √
viscosity tswj
1. High-viscosity hydroxypropyl methylcellulose tsis tuaj yeem tsim cov cellulose siab heev tsuas yog los ntawm kev nqus thiab hloov nrog nitrogen. Feem ntau, kev tsim cov high-viscosity cellulose hauv Suav teb tsis tuaj yeem tswj tau. Txawm li cas los xij, yog tias cov cuab yeej ntsuas pa oxygen tuaj yeem ntsia tau rau hauv lub lauj kaub, qhov tsim cov viscosity tuaj yeem tswj tau.
Kev siv cov neeg sawv cev sib koom ua ke
2. Tsis tas li ntawd, xav txog kev hloov pauv ceev ntawm nitrogen, thiab tib lub sijhawm, nws yog qhov yooj yim heev los tsim cov khoom lag luam siab viscosity txawm tias lub kaw lus airtight zoo li cas. Tau kawg, qib ntawm polymerization ntawm cov paj rwb refined kuj tseem ceeb heev. Yog tias qhov ntawd tsis ua haujlwm, ua los ntawm hydrophobic koom haum. Muaj cov neeg ua haujlwm hauv tsev nyob hauv qhov no. Dab tsi ntawm tus neeg sawv cev koom nrog raug xaiv muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom kawg.
Cov ntsiab lus ntawm Hydroxypropyl
3. Cov pa oxygen seem hauv lub reactor ua rau cov cellulose degradation thiab txo qhov hnyav ntawm molecular, tab sis cov pa oxygen seem yog txwv. Nws tsis yog qhov nyuaj rau kev ua kom siab viscosity ntev npaum li cov molecules tawg tau txuas dua. Txawm li cas los xij, tus nqi dej saturation kuj tseem cuam tshuam nrog cov ntsiab lus ntawm hydroxypropyl. Qee lub tuam txhab tsuas yog xav txo tus nqi thiab tus nqi, thiab tsis kam ua kom 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
4. Cov dej tuav tus nqi ntawm cov khoom muaj kev sib raug zoo nrog hydroxypropyl, tab sis rau tag nrho cov txheej txheem tshuaj tiv thaiv, nws kuj txiav txim siab nws cov dej tuav tus nqi, cov nyhuv ntawm alkalization, qhov piv ntawm methyl chloride thiab propylene oxide, thiab cov concentration ntawm alkali. Thiab qhov piv ntawm cov dej rau cov paj rwb refined txiav txim siab qhov ua tau zoo ntawm cov khoom.
Post lub sij hawm: Oct-19-2022