Lub teeb transmittance ntawm hydroxypropyl methylcellulose feem ntau cuam tshuam los ntawm cov ntsiab lus hauv qab no:
1. Qhov zoo ntawm cov khoom siv raw.
Qhov thib ob, qhov cuam tshuam ntawm alkalization.
3. Cov txheej txheem piv
4. Feem pua ntawm cov kuab tshuaj
5. Qhov cuam tshuam ntawm kev tsis ua haujlwm
Qee cov khoom muaj cov xim zoo li mis nyuj tom qab yaj, qee cov dawb mis nyuj, qee cov daj, thiab qee cov meej thiab pob tshab ... Txhawm rau daws qhov teeb meem, kho los ntawm cov ntsiab lus hauv qab no. Qee zaum acetic acid tuaj yeem cuam tshuam loj heev rau lub teeb transmittance. Nws yog qhov zoo tshaj plaws los siv acetic acid tom qab dilution. Qhov cuam tshuam loj tshaj plaws yog seb qhov tshuaj tiv thaiv puas sib npaug thiab seb qhov piv ntawm lub kaw lus puas ruaj khov (qee cov ntaub ntawv muaj dej noo thiab cov ntsiab lus tsis ruaj khov, xws li cov kuab tshuaj siv rau kev rov ua dua tshiab). Qhov tseeb, muaj ntau yam cuam tshuam. Yog tias cov khoom siv ruaj khov thiab cov neeg ua haujlwm tau kawm zoo, kev tsim khoom yuav tsum ruaj khov heev. Lub teeb transmittance yuav tsis tshaj qhov ntau ntawm ± 2%, thiab qhov sib xws ntawm cov pab pawg hloov pauv yuav tsum tau tswj hwm zoo. Hloov chaw ntawm kev sib xws, lub teeb transmittance yuav zoo heev.
Cov Yam Cuam Tshuam Rau Qhov Viscosity Ntawm Hydroxypropyl Methyl Cellulose
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 cuab yeej ntsuas pa oxygen tuaj yeem ntsia tau rau hauv lub lauj kaub, kev tsim nws cov viscosity tuaj yeem tswj tau yam tsis muaj kev txawj ntse.
ua. Ntxiv rau, 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. Tau kawg, qib ntawm polymerization ntawm paj rwb refined kuj tseem ceeb heev. Yog tias qhov ntawd tsis ua haujlwm, ces ua nws nrog hydrophobic koom tes. Muaj cov neeg sawv cev koom tes hauv thaj chaw no hauv Suav teb. Hom neeg sawv cev koom tes xaiv dab tsi muaj kev cuam tshuam loj rau kev ua tau zoo ntawm cov khoom kawg. Cov pa oxygen seem hauv lub reactor ua rau kev puas tsuaj ntawm cellulose thiab txo qis ntawm qhov hnyav molecular, tab sis cov pa oxygen seem yog txwv, tsuav yog cov molecules tawg rov txuas dua, nws tsis nyuaj rau ua kom viscosity siab. Txawm li cas los xij, qhov nqi saturation muaj ntau yam ua nrog cov ntsiab lus ntawm hydroxypropyl. Qee lub Hoobkas tsuas yog 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. Tus nqi khaws cia dej 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 tus nqi khaws cia dej, alkalization nyhuv, piv ntawm methyl chloride thiab propylene oxide, alkali concentration thiab khaws cia dej. Qhov piv rau paj rwb zoo txiav txim siab qhov ua tau zoo ntawm cov khoom.
Lub sijhawm tshaj tawm: Tsib Hlis-23-2023