Qhov viscosity index ntawm hydroxypropyl methylcellulose yog ib qho 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 lawm!
1. Kev tswj qhov viscosity
Cov hydroxypropyl methylcellulose uas muaj viscosity siab tsis tuaj yeem tsim cov cellulose siab heev tsuas yog los ntawm kev nqus tsev thiab hloov nitrogen hauv kev tsim khoom. 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 ntsuas pa oxygen tuaj yeem ntsia tau rau hauv lub lauj kaub, kev tsim nws cov viscosity tuaj yeem tswj tau.
2. Siv tus neeg sawv cev koom tes
Tsis tas li ntawd xwb, xav txog qhov hloov pauv ntawm nitrogen, nws yooj yim los tsim cov khoom muaj viscosity siab tsis hais lub kaw lus airtight li cas los xij. Tau kawg, qib polymerization ntawm paj rwb refined kuj tseem ceeb heev. Yog tias qhov ntawd tsis ua haujlwm, ces ua nws nrog hydrophobic association. Muaj cov neeg sawv cev koom tes hauv thaj chaw no hauv Suav teb. Hom neeg sawv cev koom tes xaiv muaj feem cuam tshuam loj heev rau kev ua tau zoo ntawm cov khoom kawg.
3. Cov ntsiab lus Hydroxypropyl
Cov pa oxygen seem hauv lub reactor ua rau cellulose puas tsuaj thiab txo qhov hnyav molecular, tab sis cov pa oxygen seem tsawg, tsuav yog cov molecule tawg rov txuas dua, nws tsis nyuaj rau ua kom muaj viscosity siab. Txawm li cas los xij, qhov saturation rate muaj ntau yam ua nrog cov ntsiab lus ntawm hydroxypropyl. Qee lub Hoobkas tsuas xav txo tus nqi thiab tus nqi, tab sis 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.
4. Lwm yam tseem ceeb
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, alkalization nyhuv, piv ntawm methyl chloride thiab propylene oxide, alkali concentration thiab dej khaws cia. Qhov piv rau paj rwb zoo txiav txim siab qhov ua tau zoo ntawm cov khoom.
Lub sijhawm tshaj tawm: Plaub Hlis-04-2023