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 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 ntawm nws cov viscosity tuaj yeem tswj tau. 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.
Lub teeb kis ntawm hydroxypropyl methylcellulose feem ntau cuam tshuam los ntawm cov ntsiab lus hauv qab no:
1. Qhov zoo ntawm cov khoom siv raw.
2. Cov nyhuv ntawm alkalization.
3. Txheej txheem piv.
4. Qhov piv ntawm cov kuab tshuaj.
5. Cov nyhuv neutralizing.
Cov pa oxygen residual uas muaj nyob rau hauv boiler yuav ua rau degradation ntawm cellulose thiab txo qhov hnyav molecular, tab sis cov residual oxygen yog txwv, yog hais tias tsuas yog mus cuag puas molecules, ua kom siab viscosity yooj yim. Txawm li cas los xij, qib ntawm cov dej saturated kuj muaj kev sib raug zoo nrog qib ntawm hydroxyproline. Qee lub chaw tsim khoom tsuas yog xav txo tus nqi thiab tus nqi, thiab tsis xav kom cov ntsiab lus ntawm hydroxyproline nce ntxiv kom qhov zoo tsis tshaj qib ntawm cov khoom tsim tawm txawv teb chaws. Kev tiv thaiv qib ntawm cov khoom muaj feem xyuam nrog dej phenol, tab sis feem ntau, cov txheej txheem tshuaj tiv thaiv kuj txiav txim siab nws cov qib kev txuag, qhov piv ntawm alkali, methyl chloride thiab propylene oxide, qhov concentration ntawm alkali thiab qhov piv ntawm dej thiab paj rwb txiav txim siab nws cov kev ua tau zoo. .
Post lub sij hawm: Apr-23-2023