Niaj hnub no peb yuav tsom mus rau yuav ua li cas ntxiv ib hom ntawm thickeners.
Cov hom kev siv cov thickeners feem ntau yog inorganic, cellulose, acrylic, thiab polyurethane.
Inorganic
Cov ntaub ntawv inorganic feem ntau yog bentonite, fumed silicon, thiab lwm yam, uas feem ntau yog ntxiv rau slurry rau kev sib tsoo, vim nws nyuaj rau disperse lawv tag nrho vim cov pa xim sib tov lub zog.
Kuj tseem muaj ib feem me me uas yuav tau muab tso ua ntej thiab npaj rau hauv gel rau kev siv.
Lawv tuaj yeem muab ntxiv rau cov xim los ntawm kev sib tsoo kom ua tau qee yam ntawm pre-gel. Kuj tseem muaj qee qhov yooj yim tawg thiab tuaj yeem ua rau hauv gel los ntawm kev kub ceev stirring. Thaum lub sijhawm npaj, kev siv dej sov tuaj yeem txhawb txoj haujlwm no.
Cellulose
Cov khoom siv feem ntau siv cellulosic yogHydroxyethyl Cellulose (HEC). Tsis zoo txaus thiab theem, dej tsis txaus, tiv thaiv pwm thiab lwm yam khoom, nws yog tsis tshua muaj siv nyob rau hauv industrial xim.
Thaum thov, nws tuaj yeem ntxiv ncaj qha lossis yaj hauv dej ua ntej.
Ua ntej ntxiv, kev saib xyuas yuav tsum tau them rau kev kho cov pH ntawm lub cev rau alkaline tej yam kev mob, uas yog tsim nyog rau nws txoj kev loj hlob sai.
Acrylic
Acrylic thickeners muaj qee yam kev siv hauv cov xim muaj xim. Nws yog tsuas yog siv nyob rau hauv cov pa coatings xws li ib tug tivthaiv thiab siab pigment-rau-piv piv, xws li steel lug thiab tiv thaiv primers.
Nyob rau hauv topcoat (tshwj xeeb tshaj yog to topcoat), ob-tivthaiv, ci kua roj vanish, high-gloss xim thiab lwm yam systems, nws muaj ib co tsis xws luag thiab tsis muaj peev xwm tag nrho.
Lub hauv paus ntsiab lus thickening ntawm acrylic thickener yog: pawg carboxyl ntawm lub polymer saw yog hloov mus rau hauv ib tug ionized carboxylate nyob rau hauv alkaline tej yam kev mob, thiab cov thickening nyhuv yog tiav los ntawm electrostatic repulsion.
Yog li, pH ntawm lub kaw lus yuav tsum tau hloov kho rau alkaline ua ntej siv, thiab pH yuav tsum tau khaws cia ntawm> 7 thaum lub sijhawm khaws cia tom ntej.
Nws tuaj yeem muab ntxiv ncaj qha lossis diluted nrog dej.
Nws tuaj yeem ua tiav ua ntej rau kev siv hauv qee lub tshuab uas yuav tsum tau muaj kev ruaj ntseg viscosity siab. Namely: ua ntej dilute lub acrylic thickener nrog dej, thiab ces ntxiv pH adjuster thaum stirring. Nyob rau lub sijhawm no, cov tshuaj thickens pom tseeb, los ntawm milky dawb mus rau pob tshab muab tshuaj txhuam, thiab nws tuaj yeem sab laug rau kev siv tom qab.
Siv txoj kev no txis lub thickening efficiency, tab sis nws muaj peev xwm nthuav dav lub thickener nyob rau hauv thaum ntxov theem, uas yog conducive mus rau lub stability ntawm lub viscosity tom qab cov xim yog ua.
Hauv kev tsim thiab tsim cov txheej txheem ntawm H1260 dej-raws li ib qho nyiaj hmoov xim, cov thickener yog siv rau hauv txoj kev no.
Polyurethane
Polyurethane thickeners yog dav siv nyob rau hauv kev lag luam txheej nrog kev ua tau zoo heev thiab tsim nyog siv rau hauv ntau lub tshuab.
Hauv daim ntawv thov, tsis muaj qhov yuav tsum tau ua ntawm pH ntawm lub cev, nws tuaj yeem muab ntxiv ncaj qha lossis tom qab dilution, nrog dej lossis hnyav. Qee cov thickeners muaj dej tsis zoo thiab tsis tuaj yeem diluted nrog dej, tab sis tsuas yog diluted nrog cov kuab tshuaj.
emulsion qhov system
Cov tshuab emulsion (xws li acrylic emulsions thiab hydroxypropyl emulsions) tsis muaj cov kuab tshuaj thiab kuj yooj yim rau thicken. Nws yog qhov zoo tshaj rau ntxiv lawv tom qab dilution. Thaum diluting, raws li lub thickening efficiency ntawm lub thickener, dilute ib qho piv txwv.
Yog hais tias lub thickening efficiency yog tsawg, lub dilution ratio yuav tsum qis dua los yog tsis diluted; Yog hais tias lub thickening efficiency siab, qhov dilution ratio yuav tsum siab dua.
Piv txwv li, SV-1540 dej-raws li polyurethane associative thickener muaj ib tug siab thickening efficiency. Thaum siv nyob rau hauv emulsion system, nws yog feem ntau diluted 10 zaug los yog 20 zaug (10% los yog 5%) rau kev siv.
Hydroxypropyl Dispersion
Hydroxypropyl dispersion resin nws tus kheej muaj qee cov kuab tshuaj, thiab nws tsis yooj yim rau thicken thaum lub sij hawm ua cov txheej txheem. Yog li ntawd, polyurethane feem ntau ntxiv nyob rau hauv ib tug qis dilution piv los yog ntxiv yam tsis dilution nyob rau hauv no hom ntawm system.
Nws yog ib qho tsim nyog sau cia tias vim muaj cov kuab tshuaj ntau ntau, cov nyhuv thickening ntawm ntau polyurethane thickeners nyob rau hauv hom no tsis pom tseeb, thiab cov thickener tsim nyog yuav tsum tau xaiv raws li lub hom phiaj. Ntawm no, kuv xav kom SV-1140 dej-raws li polyurethane associative thickener, uas muaj ib tug heev thickening efficiency thiab muaj kev ua tau zoo nyob rau hauv high-solvent systems.
Lub sij hawm xa tuaj: Plaub Hlis-25-2024