Chokhuthala cha utoto wa latex chiyenera kukhala chogwirizana bwino ndi emulsion polymer compound, apo ayi filimu yophimbayo idzakhala ndi reticulate yochepa, ndipo ipanga tinthu tosasinthika tomwe timachepetsa kukhuthala ndikukulitsa kukula kwa tinthu. Chokhuthalacho chidzasintha mphamvu ya emulsion. Mwachitsanzo, chokhuthala cha cationic chidzakhala ndi zotsatira zosasinthika pa anionic emulsifier kuti chiswe emulsion. Chokhuthala choyenera cha utoto wa latex chiyenera kukhala ndi zinthu izi:
1. Mlingo wochepa komanso kukhuthala kwabwino
2. Kukhazikika bwino kwa malo osungira, palibe kuchepetsa kukhuthala chifukwa cha zochita za ma enzyme, komanso palibe kuchepetsa kukhuthala chifukwa cha kusintha kwa kutentha ndi PH
3, kusunga madzi bwino, palibe chodabwitsa chodziwikiratu cha thovu
4. Palibe zotsatirapo zoyipa pa zinthu monga kukana kutsuka, kunyezimira, mphamvu yobisala komanso kukana madzi
5. Palibe kusuntha kwa utoto
Ukadaulo wokulitsa utoto wa latex ndi njira yofunika kwambiri yowonjezerera ubwino wa latex ndikuchepetsa mtengo. Hydroxyethyl cellulose ndi chinthu chabwino kwambiri chokulitsa utoto, chomwe chimagwira ntchito zambiri pakukulitsa, kukhazikika komanso kusintha kwa rheological kwa utoto wa latex.
Pakupanga utoto wa latex,hydroxyethyl cellulose (HEC)imagwiritsidwa ntchito ngati chosungunula, chokhuthala komanso chopachika utoto kuti chikhazikitse kukhuthala kwa chinthucho, kuchepetsa kusakanikirana kwa utoto, kupangitsa utoto kukhala wosalala komanso wosalala, komanso kupangitsa utoto wa latex kukhala wolimba. Rheology yabwino, imatha kupirira mphamvu zambiri zodula, ndipo imatha kupereka kulinganiza bwino, kukana kukanda komanso kufanana kwa utoto. Nthawi yomweyo, HEC imakhala yogwira ntchito bwino, ndipo utoto wa latex wokhuthala ndi HEC uli ndi pseudoplasticity, kotero njira zomangira monga kutsuka, kuzunguliza, kudzaza, ndi kupopera zili ndi ubwino wopulumutsa ntchito, sizosavuta kuyeretsa ndi kugwa, komanso kupopera pang'ono. HEC ili ndi chitukuko chabwino kwambiri cha mitundu. Ili ndi kusakanikirana bwino kwambiri ndi mitundu yambiri ndi zomangira, zomwe zimapangitsa kuti utoto wa latex ukhale wofanana bwino komanso wokhazikika. Chifukwa cha kusinthasintha komwe kumagwiritsidwa ntchito popanga, ndi ether yosakhala ya ionic. Chifukwa chake, ingagwiritsidwe ntchito pa pH yochuluka (2 ~ 12), ndipo imatha kusakanikirana ndi zigawo za utoto wamba wa latex monga ma pigment osinthika, zowonjezera, mchere wosungunuka kapena ma electrolyte.
Palibe vuto lililonse pa filimu yophimba. Popeza yankho lamadzi la HEC lili ndi mphamvu yoonekeratu ya pamwamba pa madzi, silivuta kutulutsa thovu panthawi yopanga ndi kumanga, ndipo chizolowezi cha mabowo a mapiri ndi mabowo ang'onoang'ono ndi chochepa.
Kusunga bwino. Pakasungidwa kwa nthawi yayitali, utoto umatha kusungunuka ndi kuyimitsidwa, ndipo palibe vuto la mtundu woyandama ndi kuphuka. Pakakhala madzi ochepa pamwamba pa utoto ndipo kutentha kwa malo osungira kumasintha kwambiri. Kukhuthala kwake kumakhala kokhazikikabe.
HEC ikhoza kuwonjezera mtengo wa PVC (kuchuluka kwa pigment) mpaka 50-60%. Kuphatikiza apo, chokhuthala cha topcoat cha utoto wochokera m'madzi chingagwiritsenso ntchito HEC.
Pakadali pano, zothina zomwe zimagwiritsidwa ntchito mu utoto wapamwamba wa latex wapakhomo ndi ma HEC ndi ma acrylic polymers ochokera kunja (kuphatikiza ma polyacrylates, homopolymer kapena copolymer emulsion thickeners a acrylic acid ndi methacrylic acid).
Hydroxyethyl cellulose ingagwiritsidwe ntchito pochiza matenda a shuga.
1. Monga guluu wothira madzi kapena woteteza
Kawirikawiri, HEC yokhala ndi kukhuthala kwa 10 mpaka 30 mPaS imagwiritsidwa ntchito. HEC ya mpaka 300mPa·S ingagwiritsidwe ntchito pamodzi ndi ma surfactants a anionic kapena cationic, ndipo zotsatira zake zimakhala bwino. Kuchuluka kwa ma reference nthawi zambiri kumakhala 0.05% ya kulemera kwa monomer.
2, monga chowonjezera mphamvu
Gwiritsani ntchito 15000mPa. Mlingo wofunikira wa HEC yokhuthala kwambiri pamwamba pa s ndi 0.5 mpaka 1% ya kulemera konse kwa latex, ndipo mtengo wa PVC ukhoza kufika pafupifupi 60%. Mu utoto wa latex, HEC ya pafupifupi 20Pa,s imagwiritsidwa ntchito, ndipo mawonekedwe osiyanasiyana a utoto wa latex ndi abwino kwambiri. Mtengo wongogwiritsa ntchito HEC pamwamba pa 30O00Pa.s ndi wotsika. Komabe, kuleza ndi mawonekedwe ena a utoto wa latex siabwino. Poganizira zofunikira paubwino ndi kuchepetsa ndalama, ndibwino kugwiritsa ntchito HEC yapakatikati ndi yapamwamba kwambiri pamodzi.
3. Njira yophatikizira utoto wa latex
HEC yokonzedwa pamwamba ikhoza kuwonjezeredwa mu ufa wouma kapena mawonekedwe a slurry. Ufa wouma umawonjezeredwa mwachindunji ku utoto wopukutira. pH ya malo owonjezera iyenera kukhala 7 kapena kuchepera. Zigawo za alkaline monga zotulutsira zitha kuwonjezeredwa pambuyo paHECyanyowetsedwa ndipo yamwazikana kwathunthu. Dothi lopangidwa ndi HEC liyenera kusakanizidwa mu dothi lonyowa HEC isanathe nthawi yokwanira kuti inyowetse ndikukhuthala mpaka itagwiritsidwa ntchito. Dothi lonyowa la HEC likhozanso kukonzedwa ndi zinthu zosakaniza zochokera ku glycol.
4. Utoto woletsa chimfine wa latex
HEC yosungunuka m'madzi imawonongeka ikakumana ndi nkhungu zomwe zimagwirizana ndi cellulose ndi zinthu zina zochokera mkati mwake. Kuwonjezera zotetezera pa utoto wokha sikokwanira, zigawo zonse ziyenera kukhala zopanda ma enzyme. Magalimoto opangira utoto wa latex ayenera kukhala aukhondo komanso aukhondo, ndipo zida zonse ziyenera kutsukidwa nthawi zonse ndi 0.5% formalin kapena 0.1% mercury solution.
Nthawi yotumizira: Epulo-25-2024