Hauv cov xim tsim qauv, hydroxyethyl cellulose (HEC) yog ib qho kev siv thickener uas muaj peev xwm txhim kho cov khoom ruaj khov, qib theem thiab kev tsim cov thaj chaw ntawm cov xim tha xim. Txhawm rau ntxiv hydroxyethyl cellulose rau cov xim pleev xim rau cov xim pleev xim thiab ua kom nws ua haujlwm tau zoo, qee cov kauj ruam thiab ceev faj yuav tsum tau ua raws. Cov txheej txheem tshwj xeeb yog raws li hauv qab no:
1. Cov yam ntxwv ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose yog cov dej tsis-ionic-soluble polymer nrog zoo heev thickening, zaj duab xis-khaws cia, raug tshem tawm thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying thiab emulsifying khoom. Nws yog feem ntau siv nyob rau hauv cov xim tha xim dej, cov nplaum, ceramics, inks thiab lwm yam khoom. Nws tau los ntawm hloov ib feem ntawm cov pab pawg hydroxyl ntawm lub cellulose molecular chart nrog hydroxyethyl pawg, yog li nws muaj cov dej solubility.
Cov haujlwm tseem ceeb ntawm HEC hauv cov xim tha xim yog:
Thickening cov nyhuv: nce lub viscosity ntawm cov xim, tiv thaiv cov xim los ntawm sagging, thiab ua kom nws muaj cov khoom tsim tsim zoo heev.
Kev Ncua Ntawv Cov nyhuv: nws muaj peev xwm kuj tau tawg thiab ruaj khov cov khoom siv xws li pigments thiab fillers los tiv thaiv lawv ntawm kev daws teeb meem.
Dej retention nyhuv: txhim kho cov dej khaws cia ntawm txheej ua yeeb yaj kiab, txuas lub sijhawm qhib, thiab txhim kho cov ntub dej ntawm cov xim.
Rheology tswj: Kho cov fluidity thiab leveling ntawm txheej, thiab txhim kho txhuam cov teeb meem thaum tsim kev tsim kho.
2. Ntxiv cov kauj ruam ntawm hydroxyethyl cellulose
Ua ntej-xaus ntawm cov kauj ruam hauv kev ua haujlwm tiag tiag, hydroxyethyl cellulose xav tau tusyees dispersed thiab yaj los ntawm kev ua ntej cov txheej txheem ua ntej. Txhawm rau kom ntseeg tau tias cellulose tuaj yeem ua tiav nws lub luag haujlwm, feem ntau yog pom zoo kom yaj nws hauv dej ua ntej, ntau dua li ntxiv nws qhia ncaj qha rau txheej. Cov kauj ruam tshwj xeeb yog raws li hauv qab no:
Xaiv cov kuab tshuaj uas tsim nyog: feem ntau cov dej deionized yog siv los ua cov kuab tshuaj. Yog tias muaj lwm yam kev daws teeb meem hauv cov txheej txheem txheej, cov kev ua tiav yuav tsum tau hloov kho raws li cov khoom siv ntawm cov kuab tshuaj ntawm cov kuab tshuaj.
Maj mam nphoo hydroxyethyl cellulose: maj mam thiab tusyees sprinkle hydulose hmoov thaum txhib dej kom tiv thaiv agglomeration. Lub nrawm dua yuav tsum tau qeeb kom tsis txhob qeeb qeeb qeeb ntawm cellulose los yog tsim "colloids" vim ntau dhau shear zog.
Sawv ntsug xaus: tom qab txia hydroxyethyl cellulose, nws yuav tsum tau sab laug kom ntseeg tau tias lub cellulose tag nrho thiab yaj hauv dej. Lub sijhawm sib cais yog nyob ntawm hom cellulose, kuab kub thiab dauvring tej yam mob.
Kho cov kab ke sib cais: nce qhov kub yuav pab ua kom nrawm txheej txheem ntawm hydroxyethyl cellulose. Nws feem ntau pom zoo los tswj qhov kev daws qhov kub ntawm 20 ℃ -40 ℃. Kev ntsuas ntau dhau yuav ua rau muaj kev ua tsis taus lossis daws teeb meem.
Kho tus lej pH tus nqi ntawm kev daws teeb meem ntawm solubility ntawm hydroxyethyl cellulose yog ze rau ntawm tus nqi ntawm kev daws teeb meem. Nws feem ntau yaj tau zoo dua nyob rau hauv nruab nrab lossis me ntsis alkaline tej yam kev mob, nrog tus nqi PH ntawm 6-8. Thaum lub sijhawm cov txheej txheem sib cais, tus nqi py tuaj yeem hloov kho los ntawm kev ntxiv ammonia lossis lwm yam tshuaj alkaline raws li xav tau.
Ntxiv hydroxyethyl cellulose cellulose tshuaj tov rau txheej txheej txheej tom qab kev sib cais, ntxiv cov tshuaj daws rau txheej. Thaum lub sijhawm ntxiv cov txheej txheem, nws yuav tsum tau ntxiv maj mam ua kom muaj kev sib xyaw kom txaus nrog cov txheej txheej av. Thaum lub sij hawm sib xyaw ua ke, nws yog ib qho tsim nyog los xaiv qhov haum stirring ceev raws li cov tshuab sib txawv los tiv thaiv cov txheej txheem los ntawm kev ua npuas ncauj vim tias muaj ntau yam shear zog.
Kho viscosity tom qab ntxiv hydroxyethyl cellulose, lub viscosity ntawm txheej tuaj yeem tswj hwm tus nqi ntxiv. Feem ntau, tus nqi ntawm hydroxyethyl cellulose siv yog ntawm 0.3% -1.0% Siab dhau qhov ntau ntawm ntxiv yuav ua rau cov txheej txheej kom muaj cov viscosity siab dhau thiab ua kom muaj kev ua tau zoo; Thaum tsis txaus ntxiv yuav tsis muaj peev xwm ua si lub luag haujlwm ntawm thickening thiab raug ncua.
Kev ntsuas kev ua haujlwm theem ntxiv tom qab kev siv txheej txheem hydroxyethyl yuav tsum tau kuaj, thiab lwm yam khoom siv txheej txheem txheej txheem, cov txheej txheej kev ntsuas ruaj khov yog tseem yuav tsum tau Saib cov txheej txheem sedimentation ntawm cov txheej tom qab sawv rau ib lub sijhawm, qhov viscosity hloov, thiab lwm yam, los ntsuas qhov ruaj ntseg ntawm hydroxyethyl cellulose.
3. Kev ceev faj
Tiv thaiv agglomeration: lub sijhawm ua tiav cov txheej txheem, hydroxyethyl cellulose yog yooj yim heev rau kev nqus dej thiab ua kom pom tau zoo los tiv thaiv kom tiv thaiv cov lumps. Qhov no yog qhov txuas tseem ceeb hauv kev ua haujlwm, txwv tsis pub nws yuav cuam tshuam rau kev sib cais thiab kev sib dhos.
Zam kev quab yuam siab: Thaum ntxiv cellulose, lub celluling ceev yuav tsum tsis txhob siab dhau los ua kom muaj kev sib tw ntawm cov pob zeb ua kom tsis txhob ua rau nws cov kev txo qis. Ib qho ntxiv, nyob rau hauv tom qab txheej txheej ntau lawm, siv cov khoom siv shear siab yuav tsum tau zam ntau li ntau tau.
Tswj cov kev sib lwv: thaum dissolving hydroxyethyl cellulose, cov dej kub yuav tsum tsis txhob siab dhau. Feem ntau nws pom zoo kom tswj nws ntawm 20 ℃ -40 ℃. Raws li cov kev mob siab, cellulose yuav txwv, uas ua rau nws cov nyhuv tuab thiab viscosity.
Cov tshuaj Cia: Hydroxyethyl cellulose cellulose colids feem ntau yuav tsum npaj kom txhij thiab siv tam sim ntawd. Lub sij hawm ntev cia yuav cuam tshuam nws viscosity thiab ruaj khov. Nws feem ntau pom zoo los npaj cov tshuaj uas yuav tsum muaj rau hnub xim pleev xim los tswj nws cov kev ua tau zoo.
Qhov sib ntxiv ntawm hydroxyethyl cellulose rau cov xim tsis yog tsuas yog cov txheej txheem sib xyaw ua ke ntawm lub cev, tab sis kuj yuav tsum tau ua ke kom ntseeg tau tias nws cov khoom siv tuab, ncua kev tshem tawm tau tag nrho. Nyob rau hauv qhov kev ntxiv, ua tib zoo saib rau kauj ruam ua ntej xaus, kev tswj hwm ntawm kev sib lwv thiab cov nqi pawj tom qab ntxiv. Cov ntsiab lus no yuav cuam tshuam ncaj qha cuam tshuam rau qhov zoo thiab ua tau zoo ntawm cov xim.
Lub Sijhawm Post: Sep-19-2024