Cov xim looj xim looj (tseem hu ua cov xim muaj dej) yog ib hom xim nrog dej raws li cov kuab tshuaj raws li cov kuab tshuaj thiab kev tiv thaiv ntawm cov phab ntsa, ceilings thiab lwm qhov chaw. Cov qauv ntawm cov xim yas feem ntau muaj polymer emulsion, xim, muab tub lim, ntxiv, ntxiv thiab lwm yam khoom xyaw. Ntawm lawv,hydroxyethyl cellulose (HEC)yog cov tuab tuab thiab yog siv dav hauv cov xim looj. Hec tsis tuaj yeem txhim kho viscosity thiab rhelology ntawm cov xim, tab sis kuj tseem txhim kho kev ua haujlwm ntawm cov xim pleev xim.
1. Cov xeeb ntxwv yooj yim ntawm HEC
HEC yog dej-soluble polymer compound hloov los ntawm cellulose nrog cov thickening zoo, ncua thiab ua yeeb yam-ua yeeb yam khoom. Nws cov molecular chain muaj cov pab pawg hydroxyethyl, uas ua kom nws yaj hauv dej thiab ua qhov kev daws teeb meem siab. HEC muaj muaj zog hydrophilicity, uas ua rau nws ua lub luag haujlwm hauv kev ncua kev ncua kev ncua, kho cov rheology thiab txhim kho zaj duab xis nyob rau hauv looj xim.
2. Kev cuam tshuam ntawm HEC thiab Polymer Emulsion
Cov ntsiab lus tseem ceeb ntawm cov xim yas yog polymer emulsion (ethylene-vinyl acetate copolymer emulsion), uas ua lub pob txha loj ntawm cov xim pleev xim. Kev sib cuam tshuam ntawm kev txhawj xeeb ®ec thiab polymer emulsion feem ntau yog ua kom pom tseeb hauv qab no:
Txhim kho cov ruaj khov: HEC, raws li lub thickener, tuaj yeem nce viscosity ntawm cov xim huv thiab pab tswj cov emulsion. Tshwj xeeb tshaj yog nyob rau hauv qis-concentration polymer emulsions, ntxiv ntawm HEC tuaj yeem txo cov sedimentation ntawm emulsion hais thiab txhim kho cov khoom seem ntawm cov xim.
Rheological/8: HEC tuaj yeem hloov kho cov thaj chaw rheological ntawm latx xim, yog li ntawd nws tau muaj cov txheej txheem zoo dua thaum lub sijhawm kev tsim kho. Piv txwv li, thaum cov txheej txheem pleev xim, HEC tuaj yeem txhim kho cov khoom zawv zawg ntawm cov xim pleev xim thiab zam dhau los sis sagging ntawm txheej. Ib qho ntxiv, HEC tseem tuaj yeem tswj hwm qhov rov qab ntawm cov xim pleev xim thiab txhim kho kev sib txuam ntawm cov xim pleev xim.
Kev ua kom zoo ntawm txheej txheej txheem ua tau zoo: qhov sib ntxiv ntawm HEC tuaj yeem txhim kho qhov hloov tau yooj yim, glossiness thiab kos kom tsis kam ntawm cov txheej. Cov qauv molecular ntawm HEC tuaj yeem sib cuam tshuam nrog cov polscer emulsion los txhim kho cov qauv xim tag nrho, ua rau nws denser thiab yog li txhim kho nws txoj kev ua siab ntev.
3. Kev cuam tshuam ntawm HEC thiab Pigments
Pigments nyob rau hauv looj cov xim tsev feem ntau suav nrog inorganic pigments (xws li titanium dioxide, Mica hmoov, thiab lwm yam) thiab cov organic pigments. Kev sib cuam tshuam ntawm HEC thiab cov pigments yog mas cuam tshuam hauv cov hauv qab no:
Xim Dispersion: cov nyhuv thickening ntawm cov xim viscosity ntawm cov xim huv si, uas tuaj yeem hloov cov xim zoo thiab zam kom tsis txhob muaj xim lossis nag lossis daus. Tshwj xeeb tshaj yog rau qee cov qauv zoo ntawm HEC tuaj yeem qhwv ntawm cov xim aggomeration, yog li kev txhim kho qhov kev rho tawm ntawm cov xim thiab cov khaub ncaws sib txawv ntawm cov xim.
Khi kev quab yuam ntawm cov xim thiab txheej yeeb yaj kiab:Tus paMolecules tuaj yeem tsim cov kev ua yeeb yam lub cev lossis cov xim ntawm cov xim xim thiab cov duab sib dhos, thiab ua kom muaj qhov tshwm sim ntawm cov xim av lossis ploj mus rau saum npoo ntawm txheej ua yeeb yaj kiab. Tshwj xeeb tshaj yog nyob rau hauv high-kev ua tau zoo looj cov xim, HEC tuaj yeem txhim kho huab cua tsis kam thiab UV tsis kam ntawm cov xim thiab txuas ntxiv txoj haujlwm lub neej ntawm txheej.
4. Kev cuam tshuam ntawm HEC thiab Fillers
Qee cov fillers (xws li calcium carbonate, talcum hmoov, ua kom muaj cov xim sib txawv ntawm cov xim yas thiab nce tus nqi-ua tau zoo ntawm cov xim. Qhov kev sib cuam tshuam ntawm HEC thiab Faib yog xav txog hauv cov hauv qab no:
Kev ncua ntawm Fillers: HEC tuaj yeem khaws cov fillers ntxiv rau cov xim looj kev sib cais los ntawm nws cov nyhuv ua kom tsis txhob muaj kev sib tiv thaiv. Rau cov fatters nrog loj dua loj dua, cov nyhuv tuab ntawm HEC yog tshwj xeeb yog qhov tseem ceeb, uas tuaj yeem ua kom muaj kev ruaj ntseg ntawm cov xim.
Gloss thiab kov ntawm cov txheej: qhov sib ntxiv ntawm cov foob ua feem ntau cuam tshuam rau cov kab thiab kov ntawm txheej. Kev ntxhov siab ®C tuaj yeem txhim kho cov tsos ua tau zoo ntawm txheej los ntawm kev kho coverping thiab kev npaj ntawm fillers. Piv txwv li, cov kev sib cais ntawm cov chaw ua haujlwm pab txo kom muaj kev sib tw ntawm cov txheej txheej thiab txhim kho lub tiaj yam thiab zoo ntawm cov xim pleev xim.
5. Kev sib cuam tshuam ntawm HEC thiab lwm yam ntxiv
Cov tshuaj txhuam hniav looj cov xim yas kuj suav nrog lwm cov kev ntxiv, thiab lwm yam yuav cuam tshuam nrog HEC thaum txhim kho kev ua yeeb yam ntawm cov xim tha xim:
Kev sib cuam tshuam ntawm defoamers thiab HEC: Txoj haujlwm ntawm Defoamers yog txhawm rau txo cov xim tawv nqaij lossis ua npuas dej nyob hauv cov xim, thiab cov neeg voscosity siab yuav cuam tshuam rau cov nyhuv ntawm defoamers. Ntau hec tej zaum yuav nyuaj rau lub defoober kom tiav tshem tawm cov npaus, yog li cuam tshuam rau cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim zoo ntawm cov xim muaj xim. Yog li ntawd, qhov nyiaj ntawm HEC ntxiv yuav tsum tau koom tes nrog tus nqi ntawm defosamer kom ua tiav qhov zoo tshaj plaws.
Kev sib cuam tshuam ntawm cov khoom txuag thiab HEC: Lub luag haujlwm ntawm cov tshuaj tiv thaiv kab mob yog los tiv thaiv kev loj hlob ntawm cov kab mob hauv cov xim thiab txuas lub sijhawm khaws cia ntawm cov xim. Raws li lub ntuj polymer, HEC's cov qauv molecular yuav cuam tshuam nrog qee yam kev txuag txuag, cuam tshuam nws cov nyhuv tiv thaiv corrosion. Yog li ntawd, nws yog qhov tseem ceeb heev los xaiv cov tshuaj tiv thaiv uas tau sib xws nrog HEC.
Lub luag haujlwm ntawmTus paNyob rau hauv looj zas xim tsis yog tsuas yog thickening, tab sis nws kev sib cuam tshuam nrog polymer emulsions, fillers thiab lwm yam kev sib ntxiv nrog cov xim ntawm cov xim huv. Kev ntxhov siab ®C tuaj yeem txhim kho cov xim zoo ntawm cov xim yas, txhim kho qhov tsis sib xws ntawm cov pigments thiab fillers, thiab txhim kho cov neeg kho tshuab thiab txhim kho cov txheej. Tsis tas li ntawd, cov nyhuv synergistic ntawm HEC thiab lwm yam kev ntxiv kuj muaj qhov cuam tshuam tseem ceeb rau cov xim muaj zog, kev tsim kho ntawm cov xim pleev xim. Yog li ntawd, hauv cov qauv tsim ntawm cov xim looj xim looj, cov kev xaiv tsim nyog ntawm nws cov khoom xyaw yog tus yuam sij los txhim kho cov xim zoo tagnrho ntawm cov xim huv.
Lub Sijhawm Post: Dec-28-2024