Cov Yam Cuam Tshuam Rau Qhov Viscosity Tsim Khoom Ntawm HPMC

1. Kev Tswj Xyuas Qhov Ntsws

Muaj viscosity siabhydroxypropyl methylcellulosetsis tuaj yeem tsim cov cellulose siab heev tsuas yog los ntawm kev nqus tsev thiab hloov nrog nitrogen. Txawm li cas los xij, yog tias lub cuab yeej ntsuas pa oxygen me me tuaj yeem ntsia tau rau hauv lub lauj kaub, kev tsim cov viscosity tuaj yeem tswj tau los ntawm kev dag.

2. Siv cov neeg sawv cev sib koom tes

Tsis tas li ntawd xwb, xav txog qhov hloov pauv ntawm nitrogen, thiab tib lub sijhawm, qhov cua nruj ntawm lub kaw lus zoo heev, thiab nws yooj yim heev rau kev tsim cov khoom muaj viscosity siab. Tau kawg qib ntawm polymerization ntawm cov paj rwb zoo kuj tseem ceeb heev. Yog tias nws tseem tsis ua haujlwm, txoj kev sib koom ua ke hydrophobic siv, thiab hom neeg sawv cev sib koom ua ke twg xaiv tau muaj kev cuam tshuam loj rau kev ua tau zoo ntawm cov khoom kawg.

3. Cov ntsiab lus Hydroxypropyl

Cov pa oxygen seem hauv lub lauj kaub ua rau cov cellulose puas tsuaj thiab qhov hnyav molecular txo qis, 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 dej saturation kuj muaj feem cuam tshuam nrog cov ntsiab lus ntawm hydroxypropyl, Qee lub Hoobkas tsuas 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 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, qhov cuam tshuam ntawm alkalization, qhov piv ntawm methyl chloride thiab propylene oxide, qhov concentration ntawm alkali thiab dej. Qhov piv nrog paj rwb zoo txiav txim siab qhov kev ua tau zoo ntawm cov khoom.