xov xwm

Raws li cov viscosity ntawm cov dej-raws li resin yog tsawg heev, nws tsis tuaj yeem ua tau raws li qhov xav tau ntawm kev khaws cia thiab kev tsim kho ntawm cov txheej txheem, yog li nws yuav tsum tau siv cov thickener tsim nyog los kho cov viscosity ntawm cov txheej txheem dej kom raug.

Muaj ntau ntau yam ntawm thickeners.Thaum xaiv cov thickeners, ntxiv rau lawv cov thickening efficiency thiab kev tswj ntawm txheej rheology, qee qhov lwm yam yuav tsum tau txiav txim siab ua kom cov txheej txheej muaj qhov kev tsim kho zoo tshaj plaws, qhov zoo tshaj plaws txheej zaj duab xis zoo li thiab lub neej ua haujlwm ntev tshaj plaws.

Kev xaiv ntawm hom thickener feem ntau yog nyob ntawm qhov xav tau thiab qhov xwm txheej tiag tiag ntawm kev tsim.

Thaum xaiv thiab siv cov thickeners, cov no yog qhov tseem ceeb.

1. Lub cev hnyav molecular HEC muaj ntau dua ntawm kev sib txuam piv rau qhov hnyav molecular thiab nthuav tawm ntau dua thickening efficiency thaum khaws cia.Thiab thaum tus nqi shear nce, lub xeev winding raug rhuav tshem, qhov ntau dua qhov shear npaum li cas, qhov me me ntawm qhov hnyav molecular ntawm viscosity.Cov txheej txheem thickening no tsis muaj dab tsi ua nrog cov khoom siv hauv paus, cov xim thiab cov khoom siv ntxiv, tsuas yog yuav tsum xaiv qhov hnyav molecular ntawm cellulose thiab kho cov concentration ntawm thickener tuaj yeem tau txais qhov zoo viscosity, thiab yog li siv dav.

2.HEUR thickener yog viscous aqueous tov nrog diol lossis diol ether ua co-solvent, nrog cov ntsiab lus ntawm 20% ~ 40%.Lub luag hauj lwm ntawm lub co-solvent yog inhibit qhov adhesion, txwv tsis pub xws li thickeners nyob rau hauv lub gel lub xeev ntawm tib concentration.Nyob rau tib lub sijhawm, muaj cov kuab tshuaj tuaj yeem zam cov khoom los ntawm kev khov, tab sis nws yuav tsum tau sov so rau lub caij ntuj no ua ntej siv.

3. Cov khoom uas tsis tshua muaj viscosity yog ib qho yooj yim rau kev pov tseg thiab tuaj yeem thauj thiab khaws cia rau hauv ntau.Yog li ntawd, qee qhov HEUR thickeners muaj cov ntsiab lus sib txawv ntawm cov khoom siv tib yam.Cov ntsiab lus co-solvent ntawm tsawg viscosity thickeners yog siab dua, thiab nruab nrab-shear viscosity ntawm cov xim yuav qis me ntsis thaum siv, uas tuaj yeem cuam tshuam los ntawm kev txo cov co-solvent ntxiv rau lwm qhov hauv kev tsim.

4. Raws li kev sib xyaw kom haum, cov viscosity tsawg HEUR tuaj yeem raug ntxiv ncaj qha rau cov xim latex.Thaum siv cov khoom muaj viscosity siab, cov thickener yuav tsum tau diluted nrog cov dej sib xyaw ua ke ua ntej nws tuaj yeem muab ntxiv.Yog hais tias koj ntxiv dej rau dilute lub thickener ncaj qha, nws yuav txo qhov concentration ntawm thawj co-solvent nyob rau hauv cov khoom, uas yuav ua rau kom cov adhesion thiab ua rau lub viscosity nce.

5. Ntxiv cov thickener rau lub tank sib tov yuav tsum tsis tu ncua thiab qeeb, thiab yuav tsum tau muab tso rau ntawm phab ntsa tank.Qhov ceev ntawm kev ntxiv yuav tsum tsis txhob ceev heev uas lub thickener nyob rau saum npoo ntawm cov kua, tab sis yuav tsum tau dragged rau hauv cov kua thiab swirled cia nyob ib ncig ntawm lub stirring ncej, txwv tsis pub lub thickener yuav tsis tov zoo los yog lub thickener yuav thickened overly thickened. los yog flocculated vim qhov siab hauv zos concentration.

6. HEUR thickener yog ntxiv rau cov xim sib xyaw tank tom qab lwm cov khoom ua kua thiab ua ntej emulsion, thiaj li ua kom lub siab gloss.

7. HASE thickeners yog ntxiv ncaj qha rau cov xim nyob rau hauv daim ntawv ntawm ib tug emulsion nyob rau hauv lub tsim ntawm emulsion xim tsis ua ntej dilution los yog pre-neutralization.Nws tuaj yeem raug ntxiv raws li cov khoom siv kawg hauv kev sib xyaw ua ke, nyob rau hauv cov xim dispersion theem, los yog ua thawj feem hauv kev sib tov.

8. Txij li HASE yog cov kua qaub emulsion siab, tom qab ntxiv, yog tias muaj alkali hauv cov xim emulsion, nws yuav sib tw rau cov alkali no.Yog li, nws yuav tsum tau ntxiv HASE thickener emulsion maj mam thiab tsis tu ncua, thiab do zoo, txwv tsis pub, nws yuav ua rau cov pigment dispersion system los yog emulsion binder hauv zos instability, thiab tom kawg yog stabilized los ntawm pawg neutralized nto.

9. Alkali tuaj yeem muab ntxiv ua ntej lossis tom qab tus neeg sawv cev thickening ntxiv.Qhov kom zoo dua ntawm kev ntxiv ua ntej yog xyuas kom tsis muaj kev ruaj ntseg hauv zos ntawm cov xim dispersion los yog emulsion binder yuav tshwm sim los ntawm cov thickener grabbing alkali los ntawm cov xim los yog binder.Qhov kom zoo dua ntawm kev ntxiv cov alkali tom qab yog tias cov thickener hais tau zoo dispersed ua ntej lawv yuav o los yog yaj los ntawm alkali, tiv thaiv lub zos thickening los yog agglomeration, nyob ntawm seb lub formulation, khoom thiab manufacturing txheej txheem.Txoj kev nyab xeeb tshaj plaws yog dilute HASE thickener nrog dej ua ntej thiab tom qab ntawd neutralize nrog alkali ua ntej.

10. HASE thickener pib o ntawm pH ntawm li 6, thiab cov thickening efficiency los mus rau hauv tag nrho ua si ntawm pH ntawm 7 mus rau 8. Kho cov pH ntawm latex xim rau saum toj no 8 tuaj yeem ua kom pH ntawm cov xim latex los ntawm qis dua 8. , yog li ua kom ruaj khov ntawm viscosity.