Tshawb nrhiav zaj duab xis-Kev tsim thiab siv cov ntsiab lus ntawm dej-Raws li xim xim: nthuav tawm cov txheej txheem sab hauv ntawm Green Txheej

Yog vim li cas dej -raws li cov xim ua kom muaj kev sib npaug ntawm kev tiv thaiv ib puag ncig thiab kev ua tau zoo nyob hauv lawv cov yeeb yaj kiab tshwj xeeb- tsim thiab siv cov hauv paus ntsiab lus.Siv dej raws li qhov nruab nrab dispersion, los ntawm kev tsim qauv tsim qauv thiab kev tswj cov txheej txheem, cov khoom tsim muaj qhov ruaj khov dispersion ntawm qib microscopic, thiab tom qab ntawv thov, cov xim pleev xim tas li yog tsim los ntawm kev hloov pauv ntawm lub cev thiab tshuaj. Kev nkag siab txog lub hauv paus ntsiab lus no yuav pab kom nkag siab qhov laj thawj tom qab nws qhov kev ua tau zoo thiab muab lub hauv paus theoretical rau optimizing formulations thiab daim ntawv thov.

Cov qauv ntawm cov dej-raws li xim muaj dej-raws li resin emulsions, pigments, fillers, thiab additives dispersed nyob rau hauv dej. Ntawm lawv, cov dej-raws li resin emulsion yog lub cev tseem ceeb ntawm kev tsim cov yeeb yaj kiab, tsim los ntawm cov khoom siv polymer ruaj khov rau hauv dej los ntawm ib qho emulsifier. Cov khoom no muaj kev ywj pheej thiab tsis tu ncua nyob rau hauv ib txwm muaj, tab sis thaum lub sij hawm thov thiab dej tshem tawm, lawv deform thiab fuse vim qhov txo qis ntawm qhov sib txawv ntawm qhov sib txawv, thaum kawg tsim ib lub network txuas ntxiv polymer, piv txwv li, cov xim pleev xim. Cov txheej txheem no yog hu ua zaj duab xis - txheej txheem ntawm cov dej dispersion, thiab nws cov ntsiab lus tseem ceeb yog cov evaporation ntawm dej thiab kev sib nrig sib nkag mus thiab fusion ntawm hais.

Zaj duab xis- txheej txheem tsim tuaj yeem muab faib ua peb theem: Ua ntej, dej evaporation tshwm sim. Tom qab cov xim yog siv rau ntawm qhov chaw substrate, nyob rau hauv qhov tsim nyog kub thiab av noo, dej maj mam evaporates, thiab emulsion hais txav los ze zog ua ke. Qhov thib ob, particle deformation thiab convergence tshwm sim. Raws li cov dej txo qis, van der Waals rog thiab capillary kev sib cuam tshuam ntawm cov khoom muaj zog, ua rau cov khoom hloov pauv los ntawm cov duab kheej kheej mus rau cov duab tsis sib xws thiab ntim nruj ua ke. Thaum kawg, particle fusion thiab interpenetration tshwm sim. Molecular diffusion thiab cross-kev sib txuas tshwm sim ntawm qhov sib cuag ntawm qhov chaw, tsim ib homogeneous thiab txuas ntxiv polymer theem, yog li ua tiav qhov yuav tsum tau muaj zog thiab ua haujlwm rau cov xov xwm. Zaj duab xis zoo nyob ntawm qhov tsawg kawg nkaus zaj duab xis- ua qhov kub thiab txias (MFFT) ntawm emulsion, particle loj thiab tis, hom additives, thiab kub thiab av noo ntawm daim ntawv thov ib puag ncig.

Cov khoom siv ntxiv ua lub luag haujlwm tseem ceeb hauv kev tswj dej hauv dej -raws li cov xim xim. Zaj duab xis-kev pab txo qis qhov tsawg kawg nkaus zaj duab xis- ua qhov kub thiab txias ntawm emulsion, tso cai rau cov xim pleev xim rau ua kom tiav cov qauv zoo ntawm chav tsev kub. Surfactants thiab thickeners kho cov viscosity thiab nto nro ntawm lub system, txhim kho wetting thiab leveling zog thiab txo daim ntawv thov tsis xws luag. Defoamers inhibits npuas tsim thiab khaws cia, ua kom cov xim zoo nkauj. Preservatives thiab mildew inhibitors inhibit microbial kev loj hlob nyob rau hauv aqueous ib puag ncig, ncua kev cia thiab kev pab cuam lub neej. Cov additives no, los ntawm kev sib koom ua ke nrog cov resins thiab pigments, ua kom dej-raws li cov xim los ua ke yooj yim ntawm daim ntawv thov nrog kev ua haujlwm ruaj khov.

Kev ua phooj ywg ib puag ncig ntawm dej- cov xim pleev xim yog los ntawm lawv cov yam ntxwv tsis tshua muaj volatile organic compound (VOC). Vim tias qhov nruab nrab dispersion yog dej, thiab kev siv cov kuab tshuaj organic xws li benzene, toluene, thiab xylene tuaj yeem txo qis lossis tshem tawm thaum lub sij hawm resin emulsion synthesis, cov pa phem tso tawm thaum siv yog qis dua li cov kuab tshuaj -raws li cov txheej txheem, yog li txo cov pa phem thiab ua haujlwm rau kev noj qab haus huv.

Hauv cov ntsiab lus, lub hauv paus ntsiab lus ntawm dej- cov xim pleev xim yog tsim kom muaj kev sib cais ruaj khov siv dej ua qhov nruab nrab, ua tiav cov yeeb yaj kiab tsim los ntawm kev tswj cov dej evaporation thiab cov txheej txheem fusion, optimize daim ntawv thov thiab kev pabcuam kev ua haujlwm nrog kev pab ntawm cov khoom siv ntxiv, thiab ua tiav ib puag ncig zoo los ntawm cov yam ntxwv VOC qis. Qhov no lub hauv paus txheej txheem txiav txim siab nws txoj kev siv dav dav thiab muab kev txhawb nqa kev tshawb fawb rau kev txhim kho kom ruaj khov ntawm cov txheej txheem ntsuab.