Lub luag haujlwm tshwj xeeb ntawm "dej" hauv Cov Txheej Txheem Dej

Waterborne txheej yog ib hom txheej txheej nrog dej raws li lub ntsiab dispersible nruab nrab tsim nyob rau hauv txheej txheej kev lag luam technology kev tshawb fawb thiab kev loj hlob nrog rau kev loj hlob ntawm kev sib raug zoo xav tau kev tiv thaiv ib puag ncig. Piv nrog rau peb lub teb chaws ib txwm hnyav hnyav hom txheej txheej muaj kuab paug teeb meem loj tsis xws luag, lub hauv paus kev ua haujlwm ntawm "dej" ntawm cov dej-raws li txheej tau tsim nws txoj hauj lwm nyob rau hauv kev lag luam ib puag ncig tus phooj ywg txheej.

Hauv cov txheej txheem dej, cov dej ua cov kuab tshuaj thiab cov kuab tshuaj siv rau hauv cov kuab tshuaj organic muaj qhov sib txawv: cov khoom siv dej muaj nplua nuj heev, hais txog cov khoom siv txheej, tuaj yeem hais tias tsis muaj qhov kawg, dej nyab xeeb thiab tsis muaj teeb meem rau tib neeg lub cev, tsis muaj. ua paug rau ib puag ncig. Cov khoom tsis haum ntawm cov dej yog cov dej vapor, uas tsis ua rau cov organic tebchaw tsis zoo, thiab tsis tsim cov pa phem iodide pa phem, thiab tsis tsim cov tshuaj tiv thaiv atmospheric raws li kev ua ntawm lub teeb thiab oxygen, uas ua rau cov pa phem thib ob. Dej tsis yog nplaim taws, tsis zoo li cov xim pleev xim rau cov kuab tshuaj yog cov nplaim taws, yog li txawm tias nws yog thauj cov xim, khaws cia thiab kev tsim kho muaj kev pheej hmoo ntau dua. Cov dej siv hauv cov xim pleev xim tsis yog dej kais dej hauv qhov kev nkag siab zoo tib yam. Qhov no yog tshwj xeeb kho deionized dej. Cov kev cai yooj yim ntawm cov dej deionized yog huv si thiab tsis muaj cov neeg kho tshuab impurities. Ordinary dej muaj calcium thiab magnesium plasma, uas nyob rau hauv cov xim electrophoretic tuaj yeem cuam tshuam qhov ruaj khov ntawm cov xim thiab cov xim tank (tshwj xeeb tshaj yog cov khaub ncaws ua luam dej). Ordinary dej kuj muaj cov kab mob thiab cov kab mob, uas yuav cuam tshuam rau qhov zoo thiab ruaj khov ntawm cov khoom txheej. Txawm li cas los xij, txij li cov dej deionized yuav tsum tau ua haujlwm cov cuab yeej siv, yuav muaj nqi ntau lawm. Tab sis tag nrho, dej deionized tseem pheej yig dua li cov kuab tshuaj organic.

Dej yog cov kuab tshuaj polar. Raws li cov khoom tseem ceeb ntawm latex xim, latex resins thiab fillers yuav tsum tau emulsified thiab dispersed nyob rau hauv dej nrog kev pab los ntawm emulsifiers thiab dispersants. Nyob rau tib lub sijhawm, Texnol, Propylene Glycole Penyl Etth, vim tias lub siab nro ntawm dej, tus neeg evaporation tus nqi qeeb. Yuav kom nce volatilization tus nqi, nws yog feem ntau yuav tsum tau ntxiv ib qho me me ntawm cov organic hnyav kom txo tau qhov nro. Rau cov laj thawj saum toj no, qhov sib ntxiv ntawm cov kuab tshuaj organic yuav ua rau kom muaj toxicity ntawm cov khoom rau tib neeg lub cev thiab ib puag ncig muaj kuab paug, thiab txo qhov kev nyab xeeb ntawm cov khoom. Yog li ntawd, tus nqi ntawm cov organic solvents nyob rau hauv waterborne coatings yuav tsum tau txo kom ntau li ntau tau. Qhov no kuj yog ib qho tseem ceeb kev ntsuas ntsuas los ntsuas cov txheej txheem dej.

Nyob rau hauv xyoo tas los no, kev tshawb fawb thiab kev loj hlob ntawm cov dej-raws li txheej txheej tau ua tiav zoo hauv kev lag luam txheej txheej tshuab hauv tsev thiab txawv teb chaws. Kev tsom xam thiab kev ntsuam xyuas ntawm cov dej-raws li txheej txheej yuav yog qhov zoo tshaj plaws ntawm kev sib raug zoo ib puag ncig tus phooj ywg txheej hauv Suav teb.