Nyob rau hauv cov xim formulations, hydroxyethyl cellulose (HEC) yog ib tug ntau thickener thiab rheology modifier uas yuav txhim khu kev ruaj ntseg cia, leveling thiab siv cov khoom ntawm cov xim. Txhawm rau ntxiv hydroxyethyl cellulose rau cov xim thiab xyuas kom meej tias nws ua haujlwm tau zoo, qee cov kauj ruam thiab kev ceev faj yuav tsum tau ua. Cov txheej txheem tshwj xeeb yog raws li hauv qab no:
1. Cov khoom ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose yog non-ionic dej-soluble polymer nrog zoo heev thickening, film-forming, water-retaining, suspension thiab emulsifying zog. Nws yog feem ntau siv hauv cov xim dej, cov nplaum, ceramics, inks thiab lwm yam khoom. Nws tau los ntawm kev hloov ib feem ntawm hydroxyl pawg ntawm cellulose molecular saw nrog hydroxyethyl pawg, yog li nws muaj dej solubility zoo.
Lub luag haujlwm tseem ceeb ntawm HEC hauv cov xim yog:
Thickening nyhuv: Ua kom cov viscosity ntawm cov xim, tiv thaiv cov xim ntawm sagging, thiab ua kom nws muaj kev tsim kho zoo heev.
Suspension effect: Nws tuaj yeem sib npaug sib cais thiab ruaj khov cov khoom xws li pigments thiab fillers kom tiv thaiv lawv los ntawm kev teeb tsa.
Cov nyhuv tuav dej: Txhim kho cov dej tuav ntawm cov zaj duab xis txheej, txuas lub sijhawm qhib, thiab txhim kho cov nyhuv ntub dej ntawm cov xim.
Rheology tswj: kho qhov fluidity thiab leveling ntawm txheej, thiab txhim kho cov teeb meem txhuam hniav thaum tsim kho.
2. Ntxiv cov kauj ruam ntawm hydroxyethyl cellulose
Cov kauj ruam ua ntej dissolution Hauv kev ua haujlwm tiag tiag, hydroxyethyl cellulose yuav tsum tau sib npaug sib npaug thiab yaj los ntawm cov txheej txheem ua ntej. Txhawm rau kom ntseeg tau tias cellulose tuaj yeem ua tiav nws lub luag haujlwm, nws feem ntau pom zoo kom yaj nws hauv dej ua ntej, tsis yog ntxiv nws ncaj qha rau txheej txheej. Cov kauj ruam tshwj xeeb yog raws li nram no:
Xaiv cov kuab tshuaj uas tsim nyog: feem ntau cov dej deionized yog siv los ua cov kuab tshuaj. Yog hais tias muaj lwm cov organic solvents nyob rau hauv lub txheej txheej txheej, lub dissolution tej yam kev mob yuav tsum tau kho raws li cov khoom ntawm hnyav hnyav.
Maj mam sprinkle hydroxyethyl cellulose: Maj mam thiab sib npaug ntawm cov hmoov hydroxyethyl cellulose thaum nplawm cov dej kom tiv thaiv kev sib tsoo. Lub nplawm ceev yuav tsum tau qeeb kom tsis txhob ua kom qeeb ntawm kev sib cais ntawm cellulose los yog tsim "colloids" vim yog lub zog shear ntau dhau.
Sawv ntsug: Tom qab sprinkling hydroxyethyl cellulose, nws yuav tsum tau muab tso rau sawv ntsug rau ib lub sij hawm (feem ntau 30 feeb mus rau ob peb teev) kom ntseeg tau tias cov cellulose yog kiag li o thiab yaj nyob rau hauv dej. Lub sij hawm dissolution nyob ntawm seb hom cellulose, hnyav kub thiab nplawm tej yam kev mob.
Kho qhov kub dissolution: nce qhov kub thiab txias pab kom ceev cov txheej txheem dissolution ntawm hydroxyethyl cellulose. Nws yog feem ntau pom zoo kom tswj cov tshuaj kub ntawm 20 ℃ -40 ℃. Qhov kub thiab txias heev yuav ua rau cellulose degradation los yog kua deterioration.
Kho tus nqi pH ntawm kev daws Lub solubility ntawm hydroxyethyl cellulose yog ze ze rau pH tus nqi ntawm cov tshuaj. Nws feem ntau dissolves zoo dua nyob rau hauv nruab nrab lossis me ntsis alkaline tej yam kev mob, nrog tus nqi pH ntawm 6-8. Thaum lub sij hawm dissolution txheej txheem, tus nqi pH tuaj yeem hloov kho los ntawm kev ntxiv ammonia lossis lwm yam alkaline raws li xav tau.
Ntxiv cov tshuaj hydroxyethyl cellulose rau lub txheej txheej tom qab dissolution, ntxiv cov tshuaj tov rau txheej. Thaum lub sij hawm ntxiv txheej txheem, nws yuav tsum tau ntxiv maj mam thiab stirred tsis tu ncua kom paub meej txaus sib tov nrog cov txheej matrix. Thaum lub sij hawm sib tov, nws yog ib qho tsim nyog los xaiv qhov tsim nyog stirring ceev raws li cov txheej txheem sib txawv los tiv thaiv lub cev los ntawm foaming los yog cellulose degradation vim lub zog shear ntau dhau.
Kho viscosity Tom qab ntxiv hydroxyethyl cellulose, viscosity ntawm txheej tuaj yeem tswj tau los ntawm kev kho cov nyiaj ntxiv. Feem ntau, tus nqi ntawm hydroxyethyl cellulose siv yog nyob nruab nrab ntawm 0.3% -1.0% (kwv yees rau tag nrho qhov hnyav ntawm txheej), thiab cov nyiaj tshwj xeeb ntxiv yuav tsum tau hloov kho sim raws li kev tsim cov txheej txheem ntawm txheej txheej. Kev sib ntxiv ntau dhau yuav ua rau cov txheej txheem muaj viscosity siab dhau thiab tsis muaj dej txaus, cuam tshuam rau kev tsim kho; thaum tsis txaus ntxiv yuav tsis tuaj yeem ua lub luag haujlwm ntawm thickening thiab ncua kev kawm.
Kev ntsuas qib thiab kev cia ruaj khov tom qab ntxiv hydroxyethyl cellulose thiab kho cov txheej txheem txheej txheej, cov txheej txheem kev tsim kho yuav tsum tau sim, suav nrog qib, sag, txhuam cov cim, thiab lwm yam. Tib lub sijhawm, cov txheej txheem cia ruaj khov kuj tseem yuav tsum tau kuaj. soj ntsuam cov sedimentation ntawm txheej tom qab sawv rau ib lub sij hawm ntawm lub sij hawm, qhov viscosity hloov, thiab lwm yam, los soj ntsuam qhov stability ntawm hydroxyethyl cellulose.
3. Ceev faj
Tiv thaiv agglomeration: Thaum lub sij hawm dissolution txheej txheem, hydroxyethyl cellulose yog heev yooj yim mus nqus dej thiab o, yog li nws yuav tsum tau muab nchuav rau hauv dej maj mam thiab xyuas kom txaus stirring los tiv thaiv kev tsim ntawm lumps. Qhov no yog qhov txuas tseem ceeb hauv kev ua haujlwm, txwv tsis pub nws yuav cuam tshuam rau qhov kev sib cais thiab qhov sib xws.
Tsis txhob siab shear quab yuam: Thaum ntxiv cellulose, lub stirring ceev yuav tsum tsis txhob siab dhau heev lawm kom tsis txhob ua puas lub cellulose molecular saw vim yog shear quab yuam ntau dhau, ua rau ib tug txo nyob rau hauv nws thickening kev kawm. Tsis tas li ntawd, nyob rau hauv cov txheej txheem tom ntej no, kev siv cov cuab yeej shear siab yuav tsum raug zam kom ntau li ntau tau.
Tswj qhov kub dissolution: Thaum dissolving hydroxyethyl cellulose, dej kub yuav tsum tsis txhob siab dhau. Nws feem ntau pom zoo kom tswj nws ntawm 20 ℃ -40 ℃. Nyob rau hauv qhov kub thiab txias, cellulose tuaj yeem degrade, ua rau txo qis hauv nws cov nyhuv thickening thiab viscosity.
Tshuaj cia: Hydroxyethyl cellulose daws feem ntau yuav tsum tau npaj thiab siv tam sim ntawd. Kev cia ntev ntev yuav cuam tshuam rau nws cov viscosity thiab stability. Nws yog feem ntau pom zoo kom npaj cov kev daws teeb meem uas yuav tsum tau ua nyob rau hnub ntawm cov xim pleev xim kom tswj nws qhov kev ua tau zoo.
Qhov sib ntxiv ntawm hydroxyethyl cellulose rau cov xim tsis yog tsuas yog ib qho yooj yim lub cev sib xyaw txheej txheem, tab sis kuj yuav tsum tau ua ke nrog cov txheej txheem tiag tiag thiab kev ua haujlwm tshwj xeeb los xyuas kom meej tias nws cov thickening, ncua kev kawm ntawv thiab dej tuav cov khoom siv tag nrho. Thaum lub sij hawm ntxiv cov txheej txheem, xyuam xim rau cov kauj ruam ua ntej dissolution, kev tswj ntawm dissolution kub thiab pH nqi, thiab tag nrho kev sib tov tom qab ntxiv. Cov ntsiab lus no yuav cuam tshuam ncaj qha rau qhov zoo thiab kev ua haujlwm ruaj khov ntawm cov xim.
Post lub sij hawm: Sep-19-2024