Lub viscosity Performance index ntawm hydroxypropyl methylcellulose yog qhov ntsuas tseem ceeb heev. 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! Qhov twg yog qhov yog!
1. viscosity tswj
High-viscosity hydroxypropyl methylcellulose tsis tuaj yeem tsim cov cellulose siab heev tsuas yog los ntawm kev nqus thiab hloov nitrogen hauv ntau lawm. Feem ntau, kev tsim cov viscosity cellulose hauv Suav teb tsis tuaj yeem tswj tau. Txawm li cas los xij, yog tias lub ntsuas pa oxygen tuaj yeem ntsia tau rau hauv lub hwj, qhov tsim ntawm nws cov viscosity tuaj yeem tswj tau.
2. Siv tus neeg sawv cev koom nrog
Tsis tas li ntawd, xav txog kev hloov ceev ntawm nitrogen, nws yog ib qho yooj yim los tsim cov khoom muaj viscosity txawm tias lub kaw lus airtight zoo li cas. Tau kawg, cov degree ntawm polymerization ntawm refined paj rwb kuj tseem ceeb heev. Yog tias qhov ntawd tsis ua haujlwm, ces ua nrog hydrophobic koom haum. Muaj cov koom haum ua haujlwm hauv cheeb tsam no hauv Suav teb. Dab tsi ntawm koom haum tus neeg sawv cev xaiv muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom kawg.
3. Hydroxypropyl cov ntsiab lus
Lub residual oxygen nyob rau hauv lub reactor ua rau degradation ntawm cellulose thiab txo qhov hnyav ntawm molecular, tab sis cov residual oxygen yog txwv, tsuav yog cov tawg molecules yog reconnected, nws tsis yog nyuaj rau siab viscosity. Txawm li cas los xij, tus nqi saturation muaj ntau ua nrog cov ntsiab lus ntawm hydroxypropyl. Qee lub chaw tsim khoom tsuas yog xav txo tus nqi thiab tus nqi, tab sis 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.
4. Lwm yam
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, alkalization nyhuv, piv ntawm methyl chloride thiab propylene oxide, alkali concentration thiab dej tuav. Qhov piv rau cov paj rwb refined txiav txim siab qhov ua tau zoo ntawm cov khoom.
Post lub sij hawm: Apr-04-2023