Silica rau Matting Agent
Dispersion yog tus txheej txheem ntawm deagglomerating, wetting, evenly distributing thiab stabilizing xim hais. Aswith tag nrho cov pigments thiab fillers, silica matting ceev feem ntau yuav agglomerate thaum lub caij cia thiab khoom xa tuaj. Vim muaj zog attraction thiab compaction forces, tus individualparticles yuav tsim qhov tsawg tshaj plaws surfacecausing agglomeration.Cov txaus shear rau dispersion yuav tau tiav los ntawm kev siv cov siab ceev stirring khoom xws li ib tug dissolver, thiab tej khoom siv no yuav tsum tau pom zoo rau txhua tus neeg. Kev saib xyuas yuav tsum tau noj kom tsis txhob kub tshaj 50 ° C thaum siv cov khoom siv tshuaj tua kab kom zoo .Tau tau txais cov tshuaj zoo sib xws, nws yuav tsum tau ua kom cov kua hloov hauv lub thawv nrog lub laminar flow. Txoj cai hom kev nquag yog tiav thaum lub zeb-pib ua ib lub vortex thiab lub hauv paus ntawm cov hniav feem ntau pom. Qhov no yog hu ua cov nyom khov dau.Thaum cov mob no thiab siv lub hau ntim ntawm cov hniav (= peripheral speed) ntawm 5 - 6 m / sec., Matting cov neeg ua haujlwm nrog peb cov silica yuav de-agglomerated thiab tag dispersed tsis pub dhau 10-15 feeb .Cov khoom phom siab siab yog tsim tau thaum lub sij hawm kev faib tawm raws li cov kev sib hloov ntawm qhov sib tw thiab cov geometry / qhov loj ntawm cov pob dissolver. Qhov sib npaug ntawm qhov sib txheeb ntawm cov hniav dissolver, lub thawv thiab qhov kom puv qhov siab, nrog rau qhov zoo tshaj plaws viscosity ntawm mill-
lub hauv paus yog qhov tseem ceeb ntawm qhov zoo tshaj plaws dispersion.The ceev peripheral ntawm cov hniav yog nyob ntawm qhov kev sib hloov ceev thiab qhov loj me ntawm cov hniav thiab yuav muab xam siv cov nram qab no equation:
π • d • u = kev ceev nrawm (m / sec)
6000
π = 3.14
d = txoj kab nruab nrab ntawm cov hniav hauv cm
u = kev sib hloov ceev ib feeb (rpm)
Qhov kev nyab xeeb ntawm kev rhuav tshem cov neeg ua hauj lwm matting hais txog ntau tsho rog thaum lub sij hawm faib, hu ua "overgrind", feem ntau tsis yog qhov teeb meem rau cov kev ruaj khov
micronized silica gels. Kev kho mob yuav tsum tau muab thaum siv milling siv los koom nrog tus neeg sawv cev ntawm tus neeg matting. Nyob rau hauv ntau shear mob overgrind yuav tshwm sim uas ua rau ib tug poob matting efficiency thiab nce ntawm viscosity.
Piv txwv: Kev sib hloov ceev = 3000 rpm, Hniav kab = 4 cm
3.14 • 4 • 3000 = 6.28 m / sec peripheral ceev
6000
Lub xeev ntawm dispersion (= fineness ntawm grind) raws li EN 21524 tuaj yeem ntsuas tau los ntawm kev siv lub zom zawg, ega Hegman gauge. Rau txhua txhua JK silica khoom muaj ib qhov raug Hegman tus nqi nyob ntawm seb qhov kev faib loj me me.
Peb matting cov neeg ua haujlwm tau yooj yim dispersible thiab tau muab tso ncaj qha mus rau hauv cov coatings tas
system ntawm txhua theem ntawm cov txheej txheem tsim. Qhov no ua rau lub postcorrection ntawm gloss nyob rau hauv lub xim npaj ua xim.
JS-280C
Txoj Kev Xeem | Cov khoom | Chav nyob | Target Values (Spec Limits) | Cov Tseem Ceeb |
HG / T3065-2008 | Poob rau qhov ziab (2Hrs, 105 ℃ ) 加热 减量 | % | Max.4.0 | 3.75 |
HG / T3066-2008 | Ignition poob lawm 1000 ℃ 灼烧 减量 | % | Max.7.0 | 4.01 |
HG / T3072-2008 | DBP nqus tus nqi DBP leb luam tawm | cm 3 / g | 3.2-3.6 | 3.30 |
HG / T3067-2008 | Tus nqi pH (10% aqueous suspension) pH Qaws | - | 6.0-8.0 | 6.58 |
HG / T3062-2008 | Sio 2 (Qhuav Basis) 二氧化硅 ( 干 基) | % | Min.96 | 98.5 |
HG / T3073-1999 | BET tshwj xeeb thaj chaw BET hais txog | m 2 / g | 240-280 | 264 |
Soluble ntsev (Na 2 SO 4 ) 可溶性 盐 | % | Max.0.5 | 0.21 | |
Particle me me ntawv | μ m | 10-15 | ||
Nruab nrab particle loj 平均 粒径 | μ m | 12 | ||
HG / T3064-2008 | 45μm sab cib seem | % | Max.0.5 | 0.1 |
xaus rau kev sib tw | Qhov no pawg ntawm cov khoom tsim nyog | |||
Cim npe nrov: silica rau matting tus neeg sawv cev Tuam Tshoj, lub Hoobkas, cov khoom lag luam, tuam ntxhab, yuav, ua nyob rau hauv Tuam Tshoj, ShaXian Sanming
