Thickeners kwa lalabala utoto ayenera kukhala bwino ngakhale ndi lalabala polima mankhwala, apo ayi padzakhala pang'ono kapangidwe mu ❖ kuyanika filimu, ndi zosasinthika tinthu aggregation zidzachitika, chifukwa mu kuchepa mamasukidwe akayendedwe ndi coarser tinthu kukula.Thickeners adzasintha mlandu wa emulsion.Mwachitsanzo, cationic thickeners adzakhala ndi zotsatira zosasinthika pa emulsifiers anionic ndi kuyambitsa demulsification.Chowonjezera chopaka utoto cha latex chiyenera kukhala ndi izi:
1. Mlingo wotsika komanso kukhuthala kwabwino
2. Kukhazikika kosungirako bwino, sikungachepetse kukhuthala chifukwa cha zochita za michere, ndipo sikungachepetse mamasukidwe akayendedwe chifukwa cha kusintha kwa kutentha ndi pH mtengo.
3. Kusungirako bwino kwa madzi, palibe mpweya wowoneka bwino
4. Palibe zotsatira zoyipa za filimu ya utoto monga kukana scrub, gloss, kubisala mphamvu ndi kukana madzi.
5. Palibe flocculation ya inki
Ukadaulo wokulirapo wa utoto wa latex ndi gawo lofunikira pakuwongolera mtundu wa latex ndikuchepetsa mtengo.Ma cellulose a Hydroxyethyl ndiwokhuthala bwino, omwe amakhala ndi zotsatira zambiri pakukula, kukhazikika komanso kusintha kwabwino kwa utoto wa latex.
Popanga utoto wa latex, hydroxyethyl cellulose (HEC) imagwiritsidwa ntchito ngati dispersant, thickener ndi pigment suspending agent kuti akhazikitse kukhuthala kwa chinthucho, kuchepetsa ma agglomeration, kupanga filimu ya utoto kukhala yosalala komanso yosalala, ndikupanga utoto wa latex kukhala wokhazikika. .Rheology yabwino, imatha kupirira mphamvu zometa ubweya wambiri, ndipo imatha kuwongolera bwino, kukana kukanda komanso kufanana kwa pigment.Panthawi imodzimodziyo, HEC imakhala ndi ntchito yabwino kwambiri, ndipo utoto wa latex wokhuthala ndi HEC uli ndi pseudoplasticity, kotero kupukuta, kupukuta, kudzaza, kupopera ndi njira zina zomangira zimakhala ndi ubwino wopulumutsa ntchito, osati zosavuta kuyeretsa, kugwedezeka, ndi kupopera pang'ono.HEC ili ndi chitukuko chabwino cha mtundu.Ili ndi kusokonezeka kwakukulu kwa mitundu yambiri yamitundu ndi zomangira, zomwe zimapangitsa utoto wa latex kukhala ndi mtundu wabwino kwambiri komanso wosasunthika.Kusinthasintha kwa kugwiritsidwa ntchito muzopanga, ndi ether yopanda ionic.Chifukwa chake, itha kugwiritsidwa ntchito mumitundu yambiri ya pH (2 ~ 12), ndipo imatha kusakanizidwa ndi zinthu zambiri za latex utoto monga ma pigment, zowonjezera, mchere wosungunuka kapena ma electrolyte.
Palibe chokhwima pa ❖ kuyanika filimu, chifukwa HEC amadzimadzi njira ali zoonekeratu madzi pamwamba mikangano makhalidwe, si kophweka thovu pa kupanga ndi kumanga, ndi chizolowezi mabowo chiphala ndi pinholes ndi zochepa.
Kukhazikika bwino kosungirako.Pakusungidwa kwa nthawi yayitali, kufalikira ndi kuyimitsidwa kwa pigment kumatha kusungidwa, ndipo palibe vuto la mtundu woyandama ndi kuphuka.Pamwamba pa utoto pamakhala wosanjikiza pang'ono wamadzi, ndipo kutentha kosungirako kumasintha kwambiri.Kukhuthala kwake kudakali kokhazikika.
HEC imatha kukulitsa mtengo wa PVC (pigment volume concentration) mpaka 50-60%.Kuphatikiza apo, utoto wopaka utoto wamadzi utha kugwiritsanso ntchito HEC.
Pakali pano, thickeners ntchito m'nyumba sing'anga ndi mkulu kalasi latex utoto ndi kunja HEC ndi akiliriki polima (kuphatikizapo polyacrylate, homopolymer kapena copolymer emulsion thickeners wa acrylic acid ndi methacrylic acid) thickeners.
Hydroxyethyl cellulose angagwiritsidwe ntchito
1. Monga dispersant kapena zoteteza guluu
Nthawi zambiri, HEC yokhala ndi viscosity ya 10-30mPaS imagwiritsidwa ntchito.HEC yomwe ingagwiritsidwe ntchito mpaka 300mPa · S idzakhala ndi zotsatira zabwino zobalalika ngati zitagwiritsidwa ntchito pamodzi ndi anionic kapena cationic surfactants.Mlingo wotchulidwa nthawi zambiri ndi 0.05% ya misa ya monomer.
2. Monga chokhuthala
Gwiritsani ntchito 15000mPa.Mlingo wotchulidwa wa high-viscosity HEC pamwamba pa s ndi 0.5-1% ya chiwerengero chonse cha utoto wa latex, ndipo mtengo wa PVC ukhoza kufika pafupifupi 60%.Gwiritsani ntchito HEC pafupifupi 20Pa,s mu utoto wa latex, ndipo mawonekedwe a utoto wa latex ndiye abwino kwambiri.Mtengo wongogwiritsa ntchito HEC pamwamba pa 30O00Pa.s ndi wotsika.Komabe, mawonekedwe a utoto wa latex si abwino.Kuchokera pakuwona zofunikira zamtundu ndi kuchepetsa mtengo, ndi bwino kugwiritsa ntchito masitayilo apakatikati ndi apamwamba HEC pamodzi.
3. Njira yosakaniza mu utoto wa latex
HEC yopangidwa ndi pamwamba imatha kuwonjezeredwa mu ufa wowuma kapena phala.Ufa wouma umawonjezeredwa mwachindunji ku pigment akupera.PH pamalo odyetserako chakudya iyenera kukhala 7 kapena kutsika.Zigawo zamchere monga Yanbian dispersant zitha kuwonjezeredwa HEC itanyowa ndikumwazika kwathunthu.Slurries opangidwa ndi HEC ayenera kuphatikizidwa mu slurry pamaso pa HEC kukhala ndi nthawi yokwanira yothira madzi ndi kulola kuti iwonongeke ku chikhalidwe chosagwiritsidwa ntchito.Ndikothekanso kukonzekera zamkati za HEC ndi ethylene glycol coalescing agents.
4. Anti-nkhungu ya utoto wa latex
HEC yosungunuka m'madzi idzawonongeka ikakumana ndi nkhungu zomwe zimakhala ndi zotsatira zapadera pa cellulose ndi zotumphukira zake.Sikokwanira kuwonjezera zotetezera ku utoto wokha, zigawo zonse ziyenera kukhala zopanda ma enzyme.Galimoto yopangira utoto wa latex iyenera kukhala yaukhondo, ndipo zida zonse ziyenera kutsukidwa pafupipafupi ndi nthunzi 0.5% formalin kapena O.1% mercury solution.
Nthawi yotumiza: Dec-26-2022