Dab tsi yuav tsum tau them sai sai rau thaum dissolving cellulose ether

Raws li cov khoom siv feem ntau siv hauv ntau qhov kev lag luam, cellulose ether hmoov muaj adhesion zoo heev, thickening thiab tuav dej. Siv dav hauv kev tsim kho, tshuaj, tshuaj pleev ib ce, khoom noj khoom haus thiab ntau yam kev lag luam. Txawm li cas los xij, kom tau txais kev ua tau zoo tshaj plaws los ntawm cellulose ether hmoov, yuav tsum tau them nyiaj rau nws cov txheej txheem dissolution. Nov yog qee yam tseem ceeb uas yuav tsum tau xav txog thaum muab cov cellulose ether hmoov:

1. Xaiv cov kuab tshuaj kom raug

Cellulose ether hmoov yog soluble hauv dej heev, tsim cov pob tshab, kua nplaum. Txawm li cas los xij, ntau hom cellulose ethers muaj qhov sib txawv hauv dej, thiab lawv cov solubility yuav cuam tshuam los ntawm cov yam ntxwv xws li kub thiab pH. Yog li ntawd, xaiv cov kuab tshuaj zoo rau kev pom zoo yog qhov tseem ceeb.

Piv txwv li, yog hais tias cov cellulose ether hmoov yuav tsum tau yaj nyob rau hauv ib tug tsawg kub ib puag ncig los yog nyob rau hauv ib tug uas tsis muaj pH system, hydroxypropylmethylcellulose (HPMC) los yog methylcellulose (MC) tej zaum yuav zoo dua ethylcellulose (EC) los yog carboxylate Better Choice Methylcellulose (CMC). Nws yog ib qho tseem ceeb uas yuav tau xaiv cov kuab tshuaj uas tsim nyog los txiav txim siab txog daim ntawv thov thiab cov khoom ntawm cov kuab tshuaj.

2. Tswj kub

Kub yog lwm qhov tseem ceeb cuam tshuam rau kev tawg ntawm cellulose ether hmoov. Lub solubility ntawm cellulose ethers nce nrog kub, tab sis yog li ntawd tus nqi ntawm dissolution, uas yuav ua rau agglomerated los yog agglomerated hmoov. Yog li ntawd, qhov kub thiab txias yuav tsum tau ua tib zoo tswj thaum lub sij hawm dissolution txheej txheem.

Feem ntau hais lus, qhov zoo tshaj plaws kub rau dissolving cellulose ether yog 20-40 ° C. Yog tias qhov kub thiab txias qis dhau, nws yuav tsum tau ncua lub sij hawm tawg lossis siv cov kuab tshuaj tsim nyog. Yog tias qhov kub thiab txias heev, nws yuav ua rau degradation ntawm cellulose ether thiab cuam tshuam rau nws cov kev ua tau zoo.

3. Do thiab do

stirring thiab agitation kuj tseem ceeb heev thaum dissolving cellulose ether hmoov. Kev ntxhov siab kom zoo pab cov hmoov sib tov sib npaug hauv cov kuab tshuaj thiab tiv thaiv clumping. stirring kuj yuav pab tau kom tus nqi ntawm dissolution, tshwj xeeb tshaj yog rau siab viscosity daws.

Txawm li cas los xij, kev ntxhov siab ntau dhau tuaj yeem ua rau huab cua npuas lossis ua npuas ncauj, uas tuaj yeem cuam tshuam rau qhov pom tseeb thiab ruaj khov ntawm cov tshuaj. Yog li ntawd, nws yog ib qho tsim nyog yuav tau kho qhov sib tov ceev thiab siv raws li cov kev cai tshwj xeeb thiab daim ntawv thov ib puag ncig ntawm cellulose ether hmoov.

4. Cov tshuaj ntxiv

Additives tuaj yeem muab ntxiv thaum lub sijhawm so ntawm cellulose ether hmoov los txhim kho nws cov kev ua tau zoo lossis kev ruaj ntseg. Piv txwv li, borax lossis lwm yam tshuaj alkaline tuaj yeem muab ntxiv los kho cov pH ntawm cov tshuaj thiab ua kom cov viscosity. Sodium bicarbonate kuj ua rau kom cov viscosity ntawm cov tshuaj, ua rau kom tus nqi ntawm dissolution.

Lwm yam additives xws li surfactants, ntsev los yog polymers yuav siv tau los txhim kho cov solubility, stability los yog lwm yam khoom ntawm cellulose ether tov. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum tau siv cov tshuaj ntxiv rau hauv kev ua kom zoo thiab xaiv kom zoo, vim tias cov khoom siv ntau dhau lossis tsis tsim nyog yuav ua rau tsis muaj kev phiv.

5. Lub sijhawm tawg

Lub sijhawm tawg yog qhov tseem ceeb hauv kev tsim khoom thiab kev siv cov cellulose ether hmoov. Lub sij hawm dissolution nyob ntawm ntau yam xws li hom cellulose ether, hnyav, kub, stirring ceev thiab concentration.

Feem ntau, cellulose ether hmoov yuav tsum tau ntxiv rau cov kuab tshuaj maj mam thiab maj mam sib tov tas li kom txog thaum tau txais cov tshuaj homogeneous. Lub sij hawm tawg tuaj yeem sib txawv ntawm ob peb feeb mus rau ob peb teev, nyob ntawm seb cov xwm txheej tau hais los saum toj no.

Nws yog ib qho tseem ceeb kom ua tib zoo saib xyuas cov txheej txheem kev sib cais thiab kho qhov tsis zoo raws li qhov xav tau los xyuas kom meej qhov zoo thiab sib xws ntawm cov tshuaj cellulose ether.

Hauv kev xaus, cellulose ether hmoov yog ib yam khoom muaj txiaj ntsig thiab muaj txiaj ntsig hauv ntau yam kev lag luam. Txawm li cas los xij, cov txheej txheem tawg yog qhov tseem ceeb kom ua tiav nws qhov kev ua tau zoo. Los ntawm kev xyuam xim rau yam xws li kev xaiv cov kuab tshuaj, tswj qhov kub thiab txias, nplawm, tshuaj ntxiv, thiab lub sijhawm so, nws muaj peev xwm tau txais cov tshuaj zoo cellulose ether uas ua tau raws li daim ntawv thov.


Post lub sij hawm: Aug-18-2023