HEC (Hydroxyethylcellulose) yog cov dej-soluble polymer uas nquag siv nrog ntau yam kev siv hauv kev lag luam thiab cov khoom siv, tshwj xeeb tshaj yog nyob rau hauv cov coatings, tshuaj pleev ib ce, tshuaj thiab zaub mov industries. Cov txheej txheem hydration ntawm HEC yog hais txog cov txheej txheem uas HEC hmoov absorbs dej thiab yaj hauv dej los tsim ib qho kev daws teeb meem.
Cov yam ntxwv cuam tshuam rau lub sijhawm hydration ntawm HEC
Lub sijhawm hydration ntawm HEC tsis kho, tab sis cuam tshuam los ntawm ntau yam. Feem ntau, lub sij hawm hydration ntawm HEC hauv dej yuav txawv ntawm ob peb feeb mus rau ob peb teev. Cov hauv qab no yog cov ntsiab lus tseem ceeb uas cuam tshuam rau lub sijhawm HEC hydration:
Molecular hnyav thiab degree ntawm kev hloov ntawm HEC: Qhov hnyav molecular thiab degree ntawm kev hloov ntawm HEC (qhov kev hloov pauv yog hais txog qib uas hydroxyethyl pawg hloov hydroxyl pawg hauv cellulose molecule) yuav cuam tshuam rau nws cov hydration npaum li cas. HEC nrog lub cev hnyav dua molecular yuav siv sij hawm ntev dua rau hydrate, thaum HEC nrog kev hloov pauv ntau dua yuav muaj dej solubility zoo dua thiab cov dej nrawm yuav nrawm dua.
Dej kub: Dej kub yog ib qho tseem ceeb cuam tshuam rau HEC hydration lub sij hawm. Feem ntau hais lus, dej kub siab tuaj yeem ua kom cov txheej txheem hydration ntawm HEC. Piv txwv li, hauv dej sov, HEC hydrates sai dua hauv dej txias. Txawm li cas los xij, dej kub uas siab dhau yuav ua rau HEC yaj tsis sib luag thiab tsim cov pob zeb, yog li nws feem ntau pom zoo kom tswj cov dej kub ntawm 20 ° C thiab 40 ° C.
stirring ceev thiab txoj kev: stirring yog ib qho tseem ceeb txhais tau tias los txhawb HEC hydration. Qhov nrawm nrawm dua, lub sijhawm luv ntawm HEC yog feem ntau. Txawm li cas los xij, overstirring yuav qhia ntau npuas, cuam tshuam qhov zoo ntawm cov tshuaj. Nws yog feem ntau pom zoo kom ntxiv HEC hmoov maj mam nrog qis ceev nplawm kom tsis txhob tsim cov agglomerates thiab kom muaj kev sib tw nruab nrab thoob plaws hauv cov txheej txheem hydration.
pH tus nqi ntawm kev daws: HEC yog qhov tseem ceeb rau pH tus nqi thiab ua tau zoo tshaj plaws hauv qhov chaw nruab nrab lossis me ntsis acidic. Nyob rau hauv huab cua pH (xws li cov kua qaub muaj zog lossis cov hauv paus), cov solubility ntawm HEC yuav raug cuam tshuam, yog li ncua sij hawm hydration. Yog li, nws feem ntau pom zoo kom ua hydration ntawm HEC nyob rau hauv ib qho chaw ze- nruab nrab pH.
Pretreatment txoj kev ntawm HEC: Pretreatment txoj kev xws li ziab, sib tsoo, thiab lwm yam yuav cuam tshuam rau hydration kev ua tau zoo ntawm HEC. Ua tiav HEC hmoov yaj thiab hydrates sai dua. Piv txwv li, pre-dispersing HEC hmoov nyob rau hauv ethanol los yog glycerin ua ntej ntxiv rau dej yuav txo tau lub sij hawm hydration.
Cov lus nug nquag nug thaum lub sij hawm HEC Hydration txheej txheem
Thaum lub sij hawm hydration txheej txheem ntawm HEC, koj yuav ntsib ib co teeb meem tshwm sim, uas feem ntau muaj feem xyuam rau txoj kev ua hauj lwm los yog ib puag ncig tej yam kev mob:
Agglomeration: Hauv kev ua haujlwm tsis raug, HEC hmoov tuaj yeem tsim cov agglomeration hauv dej. Qhov no feem ntau yog vim lub fact tias thaum HEC hmoov los rau hauv kev sib cuag nrog dej, txheej txheej tam sim ntawd absorbs dej thiab swells, tiv thaiv lub puab txheej los ntawm kev sib cuag dej, yog li tsim clumps. Qhov teeb meem no cuam tshuam lub sijhawm hydration thiab ua rau kev daws teeb meem tsis sib xws. Txhawm rau zam qhov no, nws yog feem ntau pom zoo kom maj mam sprinkle hauv HEC hmoov thaum nplawm.
Npuas teeb meem: Nyob rau hauv siab shear quab yuam los yog nplawm ceev, HEC cov kev daws teeb meem yog nquag ua kom paub ntau tus npuas. Cov npuas huab cua no tuaj yeem cuam tshuam qhov zoo ntawm cov tshuaj kawg, tshwj xeeb tshaj yog thaum siv cov xim los yog tshuaj pleev ib ce. Yog li ntawd, lub zog stirring yuav tsum tau zam thaum lub sij hawm hydration txheej txheem, thiab tsim npuas yuav txo tau los ntawm kev ntxiv defoamers.
Kev hloov viscosity hloov: Lub viscosity ntawm HEC cov tshuaj maj mam nce ntxiv thaum cov txheej txheem hydration pib. Hauv qee qhov kev siv, xws li kev tsim cov txheej txheej lossis cov nplaum, kev tswj cov viscosity yog qhov tseem ceeb. Yog hais tias lub sij hawm hydration ntev dhau lawm, viscosity yuav siab dhau, cuam tshuam rau kev ua haujlwm. Yog li, kev tswj xyuas meej ntawm lub sijhawm hydration yog ib qho tseem ceeb kom tau txais cov tshuaj viscosity uas xav tau.
HEC Hydration nyob rau hauv kev siv tswv yim
Hauv kev siv tswv yim, cov txheej txheem hydration ntawm HEC feem ntau yuav tsum tau ua kom zoo ua ke nrog cov txheej txheem tsim khoom tshwj xeeb thiab cov khoom yuav tsum tau ua. Piv txwv li, nyob rau hauv cov tshuaj pleev ib ce formulations, thiaj li yuav tau txais qhov xav tau kev ntxhib los mos thiab stability, HEC yog feem ntau pre-dissolved nyob rau hauv dej sov thiab ces lwm yam khoom xyaw maj mam ntxiv. Nyob rau hauv architectural coatings, tej zaum yuav tsim nyog los kho cov stirring ceev thiab dej kub kom ceev cov txheej txheem hydration ntawm HEC, yog li txhim kho ntau lawm efficiency.
Lub sijhawm hydration ntawm HEC yog cov txheej txheem dynamic thiab muaj kev cuam tshuam los ntawm ntau yam. Hauv cov xwm txheej sib txawv, nws yuav tsum tau kho thiab kho kom zoo raws li cov xwm txheej tshwj xeeb los xyuas kom meej tias HEC tuaj yeem ua kom dej sai thiab sib npaug thiab tsim cov tshuaj ruaj khov. Qhov no tsis tsuas yog pab txhim kho kev tsim khoom tab sis kuj ua kom zoo thiab ua haujlwm ntawm cov khoom kawg.
Post lub sij hawm: Aug-23-2024