Hauv cov qauv pleev xim, hydroxyethyl cellulose (HEC) yog ib qho thickener thiab rheology modifier uas tuaj yeem txhim kho qhov ruaj khov ntawm kev khaws cia, kev sib npaug thiab kev tsim kho ntawm cov xim. Yuav kom ntxiv hydroxyethyl cellulose rau cov xim thiab xyuas kom meej tias nws ua haujlwm tau zoo, yuav tsum ua raws li qee cov kauj ruam thiab kev ceev faj. Cov txheej txheem tshwj xeeb yog raws li nram no:
1. Cov khoom ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose yog ib qho polymer uas tsis yog ionic soluble hauv dej nrog cov khoom zoo heev rau thickening, film-forming, water-retaining, suspension thiab emulsifying. Nws feem ntau siv rau hauv cov xim pleev xim dej, cov nplaum, cov khoom siv ceramics, inks thiab lwm yam khoom. Nws tau los ntawm kev hloov ib feem ntawm cov hydroxyl pawg ntawm cov saw molecular cellulose nrog cov hydroxyethyl pawg, yog li nws muaj cov dej solubility zoo.
Cov haujlwm tseem ceeb ntawm HEC hauv cov xim yog:
Cov nyhuv ua kom tuab: Ua kom cov xim pleev kom tuab, tiv thaiv cov xim kom tsis txhob sag, thiab ua rau nws muaj cov khoom siv zoo heev.
Cov nyhuv ncua: Nws tuaj yeem sib npaug thiab ruaj khov cov khoom khov kho xws li cov xim thiab cov khoom sau kom tiv thaiv lawv los ntawm kev sib sau ua ke.
Cov nyhuv khaws dej: Txhim kho qhov khaws dej ntawm cov zaj duab xis txheej, ntev lub sijhawm qhib, thiab txhim kho cov nyhuv ntub ntawm cov xim.
Kev tswj hwm rheology: kho qhov fluidity thiab leveling ntawm lub txheej, thiab txhim kho qhov teeb meem txhuam cim thaum lub sijhawm tsim kho.
2. Cov kauj ruam ntxiv ntawm hydroxyethyl cellulose
Cov Kauj Ruam Ua Ntej Yaj Hauv kev ua haujlwm tiag tiag, hydroxyethyl cellulose yuav tsum tau sib xyaw thiab yaj kom sib npaug los ntawm cov txheej txheem ua ntej yaj. Yuav kom ntseeg tau tias cellulose tuaj yeem ua nws lub luag haujlwm tag nrho, feem ntau nws raug pom zoo kom yaj nws hauv dej ua ntej, es tsis txhob ntxiv nws ncaj qha rau hauv txheej. Cov kauj ruam tshwj xeeb yog raws li nram no:
Xaiv cov tshuaj uas tsim nyog: feem ntau siv dej deionized ua cov tshuaj. Yog tias muaj lwm cov tshuaj organic hauv lub txheej txheej, cov xwm txheej ntawm kev yaj yuav tsum tau kho raws li cov yam ntxwv ntawm cov tshuaj.
Maj mam muab hydroxyethyl cellulose rau: Maj mam muab hydroxyethyl cellulose hmoov rau thiab sib npaug thaum do cov dej kom tiv thaiv kev sib sau ua ke. Qhov ceev ntawm kev do yuav tsum qeeb kom tsis txhob ua rau qeeb ntawm qhov nrawm ntawm cellulose yaj lossis tsim "colloids" vim muaj zog ntau dhau.
Kev yaj tas li: Tom qab muab hydroxyethyl cellulose rau hauv, nws yuav tsum tau tso rau ib lub sijhawm (feem ntau yog 30 feeb txog ob peb teev) kom paub tseeb tias cellulose o tag thiab yaj hauv dej. Lub sijhawm yaj nyob ntawm hom cellulose, qhov kub ntawm cov kuab tshuaj thiab cov xwm txheej sib xyaw.
Kho qhov kub ntawm kev yaj: Kev nce qhov kub pab ua kom cov txheej txheem yaj ntawm hydroxyethyl cellulose sai dua. Feem ntau pom zoo kom tswj qhov kub ntawm cov tshuaj ntawm 20 ℃ -40 ℃. Qhov kub siab dhau yuav ua rau cellulose puas tsuaj lossis cov tshuaj puas tsuaj.
Kho qhov pH ntawm cov tshuaj Qhov solubility ntawm hydroxyethyl cellulose muaj feem cuam tshuam nrog qhov pH ntawm cov tshuaj. Feem ntau nws yaj zoo dua nyob rau hauv qhov tsis muaj zog lossis me ntsis alkaline, nrog rau pH ntawm 6-8. Thaum lub sijhawm yaj, qhov pH tuaj yeem hloov kho los ntawm kev ntxiv ammonia lossis lwm yam alkaline raws li qhov xav tau.
Ntxiv cov tshuaj hydroxyethyl cellulose rau hauv lub txheej txheem txheej Tom qab yaj, ntxiv cov tshuaj rau hauv lub txheej. Thaum lub sijhawm ntxiv, nws yuav tsum tau ntxiv qeeb qeeb thiab do tas li kom ntseeg tau tias muaj kev sib xyaw txaus nrog cov txheej txheej. Thaum lub sijhawm sib tov, nws yog qhov tsim nyog los xaiv qhov ceev sib tov raws li cov txheej txheem sib txawv kom tiv thaiv lub kaw lus los ntawm kev ua npuas ncauj lossis kev puas tsuaj ntawm cellulose vim muaj zog ntau dhau.
Kho qhov viscosity Tom qab ntxiv hydroxyethyl cellulose, qhov viscosity ntawm lub txheej tuaj yeem tswj tau los ntawm kev kho qhov ntau ntxiv. Feem ntau, qhov ntau ntawm hydroxyethyl cellulose siv yog ntawm 0.3% -1.0% (piv rau tag nrho qhov hnyav ntawm lub txheej), thiab qhov ntau ntxiv tshwj xeeb yuav tsum tau kho qhov kev sim raws li qhov yuav tsum tau ua ntawm lub txheej. Kev ntxiv ntau dhau yuav ua rau lub txheej muaj viscosity siab dhau thiab tsis zoo, cuam tshuam rau kev ua haujlwm ntawm kev tsim kho; thaum tsis txaus ntxiv yuav tsis tuaj yeem ua lub luag haujlwm ntawm thickening thiab suspension.
Ua qhov kev ntsuam xyuas kev sib npaug thiab kev khaws cia ruaj khov Tom qab ntxiv hydroxyethyl cellulose thiab kho cov mis txheej, kev ua haujlwm ntawm kev tsim kho txheej yuav tsum tau kuaj xyuas, suav nrog kev sib npaug, sag, kev tswj cov cim txhuam, thiab lwm yam. Tib lub sijhawm, kev ntsuam xyuas kev ruaj khov ntawm kev khaws cia txheej kuj tseem yuav tsum tau saib xyuas qhov kev sib xyaw ntawm cov txheej tom qab sawv ntsug rau ib lub sijhawm, qhov kev hloov pauv viscosity, thiab lwm yam, los ntsuas qhov ruaj khov ntawm hydroxyethyl cellulose.
3. Kev ceev faj
Tiv thaiv kev sib sau ua ke: Thaum lub sijhawm yaj, hydroxyethyl cellulose yooj yim heev rau kev nqus dej thiab o, yog li nws yuav tsum tau nchuav rau hauv dej qeeb qeeb thiab xyuas kom meej tias muaj kev sib xyaw txaus kom tiv thaiv kev tsim cov pob. Qhov no yog qhov txuas tseem ceeb hauv kev ua haujlwm, txwv tsis pub nws yuav cuam tshuam rau qhov nrawm thiab kev sib xws.
Tsis txhob siv lub zog siab heev: Thaum ntxiv cellulose, qhov ceev ntawm kev sib tov yuav tsum tsis txhob siab dhau kom tsis txhob ua rau cov saw hlau cellulose puas tsuaj vim muaj zog ntau dhau, ua rau nws cov kev ua kom tuab zuj zus. Tsis tas li ntawd xwb, thaum tsim cov txheej tom ntej, yuav tsum tsis txhob siv cov khoom siv siab heev.
Tswj qhov kub ntawm kev yaj: Thaum yaj hydroxyethyl cellulose, qhov kub ntawm dej yuav tsum tsis txhob siab dhau. Feem ntau pom zoo kom tswj nws ntawm 20 ℃ -40 ℃. Nyob rau hauv qhov kub siab, cellulose tuaj yeem lwj, ua rau nws cov nyhuv tuab thiab viscosity txo qis.
Kev khaws cov tshuaj: Feem ntau cov tshuaj Hydroxyethyl cellulose yuav tsum tau npaj thiab siv tam sim ntawd. Kev khaws cia ntev yuav cuam tshuam rau nws qhov viscosity thiab kev ruaj khov. Feem ntau nws raug pom zoo kom npaj cov tshuaj uas xav tau rau hnub tsim xim kom nws ua haujlwm tau zoo tshaj plaws.
Kev ntxiv hydroxyethyl cellulose rau hauv cov xim tsis yog tsuas yog ib qho txheej txheem sib tov yooj yim xwb, tab sis kuj yuav tsum tau ua ke nrog cov txheej txheem xav tau tiag tiag thiab cov lus qhia ua haujlwm kom ntseeg tau tias nws cov khoom tuab, ncua thiab khaws dej tau siv tag nrho. Thaum lub sijhawm ntxiv, them sai sai rau cov kauj ruam ua ntej yaj, kev tswj hwm qhov kub yaj thiab pH tus nqi, thiab kev sib tov tag nrho tom qab ntxiv. Cov ntsiab lus no yuav cuam tshuam ncaj qha rau qhov zoo thiab kev ua haujlwm ruaj khov ntawm cov xim.
Lub sijhawm tshaj tawm: Cuaj hlis-19-2024