Niaj hnub no peb yuav tsom mus rau yuav ua li cas ntxiv cov hom thickeners tshwj xeeb.
Cov hom thickeners uas siv ntau tshaj plaws yog inorganic, cellulose, acrylic, thiab polyurethane.
Cov khoom tsis muaj organic
Cov ntaub ntawv inorganic feem ntau yog bentonite, fumed silicon, thiab lwm yam, uas feem ntau ntxiv rau hauv cov slurry rau kev sib tsoo, vim tias nws nyuaj rau disperse lawv tag nrho vim yog lub zog sib tov xim ib txwm muaj.
Kuj tseem muaj ib feem me me uas yuav raug faib ua ntej thiab npaj ua gel rau kev siv.
Lawv tuaj yeem ntxiv rau hauv cov xim los ntawm kev sib tsoo kom ua tau ib qho pre-gel. Kuj tseem muaj qee qhov uas yooj yim rau disperse thiab tuaj yeem ua rau gel los ntawm kev do ceev ceev. Thaum lub sijhawm npaj, kev siv dej sov tuaj yeem txhawb cov txheej txheem no.
Cellulose
Cov khoom siv cellulosic feem ntau yogHydroxyethyl Cellulose (HEC). Kev ntws tsis zoo thiab qib, tsis muaj dej tsis txaus, tiv thaiv pwm thiab lwm yam khoom, nws tsis tshua siv rau hauv cov xim pleev xim.
Thaum thov, nws tuaj yeem ntxiv ncaj qha lossis yaj rau hauv dej ua ntej.
Ua ntej ntxiv, yuav tsum tau them sai sai rau kev kho qhov pH ntawm lub kaw lus rau cov xwm txheej alkaline, uas yog qhov zoo rau nws txoj kev loj hlob sai.
Acrylic
Cov tshuaj ua kom tuab acrylic muaj qee yam kev siv hauv cov xim pleev xim rau kev lag luam. Nws feem ntau yog siv rau hauv cov txheej txheem ib txwm muaj xws li ib qho khoom thiab cov xim sib piv siab, xws li cov qauv hlau thiab cov tshuaj tiv thaiv primers.
Hauv cov xim pleev sab saud (tshwj xeeb tshaj yog cov xim pleev sab saud meej), ob-component, ci varnish, xim ci ntsa iab thiab lwm yam tshuab, nws muaj qee qhov tsis zoo thiab tsis tuaj yeem ua tau zoo tag nrho.
Lub hauv paus ntsiab lus ntawm cov acrylic thickener yog: pawg carboxyl ntawm cov saw polymer hloov pauv mus rau hauv cov carboxylate ionized nyob rau hauv alkaline mob, thiab cov nyhuv thickening yog ua tiav los ntawm electrostatic repulsion.
Yog li ntawd, qhov pH ntawm lub kaw lus yuav tsum tau kho kom alkaline ua ntej siv, thiab qhov pH kuj yuav tsum tau tswj hwm ntawm > 7 thaum lub sijhawm khaws cia tom qab.
Nws tuaj yeem ntxiv ncaj qha los yog diluted nrog dej.
Nws tuaj yeem yaj ua ntej rau kev siv hauv qee lub tshuab uas xav tau kev ruaj khov viscosity siab. Uas yog: ua ntej, dilute cov acrylic thickener nrog dej, thiab tom qab ntawd ntxiv cov pH adjuster thaum do. Lub sijhawm no, cov tshuaj yuav tuab, los ntawm cov mis dawb mus rau cov pob tshab, thiab nws tuaj yeem tso rau tom qab siv.
Siv txoj kev no ua rau qhov ua kom tuab zuj zus, tab sis nws tuaj yeem nthuav dav cov khoom ua kom tuab zuj zus thaum ntxov, uas yog qhov zoo rau kev ruaj khov ntawm cov viscosity tom qab ua xim.
Hauv cov txheej txheem tsim thiab tsim cov txheej txheem ntawm H1260 dej-raws li ib qho khoom siv nyiaj hmoov xim, cov thickener siv rau hauv txoj kev no.
Polyurethane
Cov tshuaj polyurethane thickeners siv dav hauv kev lag luam coatings nrog kev ua tau zoo heev thiab tsim nyog rau kev siv hauv ntau lub tshuab.
Thaum siv, tsis tas yuav tsum muaj pH ntawm lub cev, koj tuaj yeem ntxiv nws ncaj qha lossis tom qab diluted, nrog dej lossis cov kuab tshuaj. Qee cov thickeners muaj hydrophilicity tsis zoo thiab tsis tuaj yeem diluted nrog dej, tab sis tsuas yog diluted nrog cov kuab tshuaj.
lub cev emulsion
Cov txheej txheem emulsion (xws li acrylic emulsions thiab hydroxypropyl emulsions) tsis muaj cov kuab tshuaj thiab yooj yim rau thicken. Nws yog qhov zoo tshaj plaws los ntxiv lawv tom qab dilution. Thaum diluting, raws li qhov ua tau zoo ntawm thickener, dilute ib qho piv txwv.
Yog tias qhov ua kom tuab tsawg, qhov piv ntawm kev dilution yuav tsum qis dua lossis tsis diluted; yog tias qhov ua kom tuab siab, qhov piv ntawm kev dilution yuav tsum siab dua.
Piv txwv li, SV-1540 cov tshuaj polyurethane associative thickener uas siv dej muaj qhov ua kom tuab zoo. Thaum siv rau hauv lub tshuab emulsion, feem ntau nws yuav tsum tau diluted 10 zaug lossis 20 zaug (10% lossis 5%) rau kev siv.
Hydroxypropyl Dispersion
Cov tshuaj hydroxypropyl dispersion resin nws tus kheej muaj qee cov kuab tshuaj, thiab nws tsis yooj yim rau tuab thaum lub sijhawm ua xim. Yog li ntawd, polyurethane feem ntau ntxiv rau hauv qhov sib piv dilution qis dua lossis ntxiv yam tsis muaj dilution hauv hom kab ke no.
Nws yog ib qho tsim nyog sau tseg tias vim muaj kev cuam tshuam ntawm ntau cov kuab tshuaj, qhov cuam tshuam ntawm ntau cov polyurethane thickeners hauv hom kab ke no tsis pom tseeb, thiab yuav tsum xaiv cov thickener tsim nyog rau hauv txoj kev tsom mus rau. Ntawm no, kuv xav kom pom zoo SV-1140 dej-raws li polyurethane associative thickener, uas muaj kev ua haujlwm thickening siab heev thiab muaj kev ua tau zoo heev hauv cov kab ke siab-solvent.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024