Niaj hnub no peb yuav tsom rau yuav ua li cas ntxiv cov hom tuab ntawm cov thickeners.
Cov hom ntawm feem ntau siv thickeners feem ntau yog inorganic, cellulose, acrylic, thiab polyurethane.
Inorganic
Cov ntaub ntawv inorganic yog tsuas yog bentonite, fumed silicon, thiab lwm yam ntxiv ntxiv rau kev sib tsoo, vim tias nws yog qhov tsis yooj yim rau lawv vim muaj cov xim pleev xim rau lub zog.
Kuj tseem muaj ib feem me uas yuav ua ntej tawg thiab npaj rau hauv gel rau siv.
Lawv tuaj yeem raug ntxiv rau cov xim los ntawm kev sib tsoo kom ua ib qho nyiaj ntawm kev ua ntej-gel. Kuj tseem muaj qee qhov yooj yim rau disperse thiab tuaj yeem ua rau gel los ntawm high-spe-speedirring. Thaum lub sijhawm npaj npaj, kev siv dej sov tuaj yeem txhawb nqa tus txheej txheem no.
Cellulose
Cov khoom lag luam feem ntau yog sivhydroxyethyl cellulose (HEC)Cov. Cov dej ntws tsis zoo thiab cov dej tsis txaus, tiv thaiv pwm thiab lwm yam khoom, nws tsis tshua siv cov xim muaj xim.
Thaum thov, nws tuaj yeem txuas ntxiv ncaj qha lossis yaj hauv dej ua ntej.
Ua ntej ntxiv, saib xyuas yuav tsum tau them rau kev kho cov pheeb suab ph ntawm lub system mus rau alkaline cov xwm txheej, uas yog conducive rau nws txoj kev loj hlob sai.
Tus kws ntxawv
Acrylic thickeners muaj qee cov ntawv thov hauv cov xim pleev xim. Nws yog tsuas yog siv nyob rau hauv cov txheej txheem sib xyaw xws li ib qho kev tivthaiv thiab cov xim muaj txiaj ntsig zoo, xws li cov qauv hlau thiab cov primactive primers.
Nyob rau sab topcoat (tshwj xeeb tshaj yog ntshiab sab toxat), ob-sib txawv, ci varsnish, siab zoo xim thiab lwm yam kev tsis xws luag thiab tsis tuaj yeem muaj peev xwm.
Lub ntsiab lus tuab ntawm acrylic thickener yog li pawg polymer tau hloov mus rau hauv Ionized carboxylate nyob rau hauv ib tug ionized cov xwm txheej ua tiav los ntawm electrostatic repulsion.
Yog li ntawd, cov kab ntawv yuav tsum tau hloov kho rau Alkaline ua ntej siv, thiab cov pH yuav tsum tau tswj hwm ntawm> 7 thaum lub sijhawm cia khoom tom ntej.
Nws tuaj yeem txuas ntxiv ncaj qha los yog diluted nrog dej.
Nws tuaj yeem ua ntej yaj siv rau kev siv hauv qee cov systems uas yuav tsum tau kub viscosity stability. Uas yog: Ua ntej Dilute Cov Acrylicickener nrog dej, thiab tom qab ntawd ntxiv cov pX adjuster thaum stirring. Nyob rau lub sijhawm no, cov kuab thickens pom tseeb tiag, los ntawm Milky dawb rau pob tshab paste, thiab nws tuaj yeem yog sab laug rau kev siv tom qab.
Kev siv hom kev txi no tua cov tuab, tab sis nws tuaj yeem nthuav cov tuab nyob rau hauv thaum ntxov ntawm lub viscosity tom qab cov xim yog ua.
Nyob rau hauv cov qauv tsim thiab cov txheej txheem tsim khoom ntawm H1260 ib-tiv thaiv nyiaj nyiaj hmoov xim, cov tuab tuab tau siv txoj hauv kev no.
Polyurethane
Polyurethane thickeners tau siv dav hauv cov txheej txheej nrog kev ua tau zoo thiab haum rau siv ntau lub tshuab.
Hauv daim ntawv thov, tsis tas yuav tsum muaj nyob rau ntawm PH ntawm lub system, nws tuaj yeem txuas ntxiv ncaj qha lossis tom qab kev zom zaws lossis cov kuab tshuaj. Qee cov thickeners muaj cov tsis zoo hydrophilicity thiab tsis tuaj yeem raug dej nrog dej, tab sis tsuas yog ua kom huv nrog cov kuab tshuaj.
Emulsion System
Emulsion tshuab (suav nrog acrylic emulsions thiab hydroxypropyl emulsions) tsis muaj cov kuab tshuaj thiab yog qhov yooj yim kom tuab. Nws yog qhov zoo tshaj plaws ntxiv rau lawv tom qab dilution. Thaum diluting, raws li cov tuab tuab ntawm cov tuab tuab, dilute ib tug piv.
Yog hais tias cov tuab tuab yog qhov tsawg, cov dilution piv yuav tsum qis dua lossis tsis diluted; Yog hais tias cov thicking efficiency yog siab, cov dilution piv yuav tsum siab dua.
Piv txwv li, SV-1540 cov dej-raws polyurethane txuam nrog thickener muaj lub siab thicking ua hauj lwm zoo. Thaum siv hauv cov txheej txheem emulsion, nws feem ntau diluted 10 zaug lossis 20 zaug (10% lossis 5%) rau kev siv.
HydroxyPropyl Dispersion
HydroxyPropyl Dispin nws tus kheej muaj qee qhov kev daws teeb meem, thiab nws tsis yooj yim los ua tuab thaum lub sijhawm ua. Yog li ntawd, Polyurethane feem ntau ntxiv rau hauv qis dilution piv lossis ntxiv yam tsis muaj kev ua haujlwm nyob rau hauv hom kab ke no.
Nws yog tsim nyog sau tseg tias vim muaj kev cuam tshuam ntawm ntau ntawm cov kuab tshuaj thickeners hauv hom system no tsis pom tseeb, thiab cov tuab tuab uas tau xaiv nyob rau hauv hom phiaj. Ntawm no, Kuv xav pom zoo kom muaj SV-1140 cov dej polyurethane sib txuam ua ke thickener, uas muaj ib qho kev ua tau zoo heev thiab muaj kev ua tau zoo heev hauv cov kuab tshuaj ntau heev.
Lub Sijhawm Post: Apr-25-2024