Ikhemikhali ye-UV ye-Waterborne (WB) ibonise ukukhula okuphawulekayo ezimakethe zezinkuni zezimboni zangaphakathi ngoba ubuchwepheshe buhlinzeka ngokusebenza okuhle kakhulu, ukukhishwa kwe-solvent ephansi kanye nokusebenza kahle kokukhiqiza okukhulayo. Amasistimu wokumboza ama-UV anikeza umsebenzisi wokugcina izinzuzo zokungavikeleki kwamakhemikhali nokuklwejwa okuvelele, ukumelana okuhle kakhulu kwebhulokhi, ama-VOC aphansi kakhulu kanye nendawo encane yemishini enendawo yokugcina encane edingekayo. Lezi zinhlelo zinezakhiwo eziqhathaniswa kahle nezinhlelo ze-urethane ezinezingxenye ezimbili ngaphandle kwezinkinga zama-crosslinker ayingozi kanye nokukhathazeka ngempilo yebhodwe. Uhlelo lonke lubiza ngempumelelo ngenxa yokwenyuka kwesivinini sokukhiqiza kanye nezindleko eziphansi zamandla. Lezi zinzuzo ezifanayo zingaba nenzuzo ezinhlelweni zokusebenza zangaphandle ezifakwe efekthri ezihlanganisa amafreyimu ewindi nezicabha, i-siding nokunye ukugaya. Lezi zingxenye zemakethe ngokuvamile zisebenzisa ama-emulsions e-acrylic nama-polyurethane dispersions ngoba anokukhanya okuhle kakhulu nokugcinwa kombala, futhi akhombisa ukuqina okuphakeme. Kulolu cwaningo, ama-polyurethane-acrylic resins anokusebenza kwe-UV ahlolwe ngokuya ngemininingwane yemboni kokubili kwezicelo zokhuni zezimboni zangaphakathi nangaphandle.
Izinhlobo ezintathu zezingubo ezisekelwe ku-solvent zivame ukusetshenziselwa izicelo zokhuni zezimboni. I-nitrocellulose lacquer ivamise ukuhlanganisa okuqinile okuphansi kwe-nitrocellulose namafutha noma ama-alkyd asuselwa kuwoyela. Lezi zingubo zoma ngokushesha futhi zinamandla aphezulu okucwebezela. Ngokuvamile zisetshenziselwa izicelo zefenisha yokuhlala. Ziba nenkinga yokuba phuzi ngokuhamba kwesikhathi futhi zingaba brittle. Futhi abanakho ukumelana namakhemikhali. Ama-lacquers e-nitrocellulose anama-VOC aphezulu kakhulu, ngokuvamile angu-500 g/L noma ngaphezulu. Ama-lacquers ase-pre-catalyzed ayinhlanganisela ye-nitrocellulose, amafutha noma ama-alkyds asekelwe kumafutha, ama-plasticizers kanye ne-urea-formaldehyde. Basebenzisa i-acid catalyst ebuthakathaka njenge-butyl acid phosphate. Lezi ezinengilazi zineshelufu lokuphila cishe izinyanga ezine. Zisetshenziswa efenisha yasehhovisi, yesikhungo kanye nendawo yokuhlala. Ama-lacquers ase-pre-catalyzed ane-chemical resistances engcono kune-nitrocellulose lacquers. Futhi banama-VOC aphezulu kakhulu. Ama-varnish okuguqula ayinhlanganisela ye-alkyd esekelwe kuwoyela, i-urea formaldehyde ne-melamine. Basebenzisa i-acid catalyst enamandla njenge-p-toluene sulfonic acid. Baphila ebhodweni amahora angama-24 kuye kwangama-48. Zisetshenziswa ekhabetheni lasekhishini, ifenisha yehhovisi kanye nezicelo zefenisha yokuhlala. Ama-varnish okuguqula anezici ezinhle kakhulu zezinhlobo ezintathu ze-solvent-based coatings ngokuvamile esetshenziselwa ukhuni lwezimboni. Anama-VOC aphezulu kakhulu kanye nokukhishwa kwe-formaldehyde.
Ama-emulsions e-acrylic asekelwe emanzini asekelwe emanzini kanye ne-polyurethane dispersions ingaba ezinye izindlela ezinhle kakhulu zemikhiqizo esekelwe ku-solvent yezicelo zokhuni zezimboni. Ama-emulsions e-Acrylic anikeza amakhemikhali amahle kakhulu kanye nokumelana nokuvinjwa, amanani aphezulu okuqina, ukuqina okuvelele kanye nesimo sezulu, nokunamathela okuthuthukisiwe ezindaweni ezingenazo izimbotshana. Zinezikhathi ezomile ezisheshayo, ezivumela ikhabhinethi, ifenisha noma umkhiqizi wemikhiqizo yokwakha ukuthi aphathe izingxenye ngokushesha ngemva kokufaka isicelo. Ama-PUD anikeza ukumelana okuhle kakhulu kwe-abrasion, ukuguquguquka, nokumelana nokuklwebheka kanye ne-mar. Bangabalingani abahle bokuhlanganisa nama-emulsions e-acrylic ukuthuthukisa izakhiwo zemishini. Kokubili ama-emulsion e-acrylic nama-PUD angasabela ngamakhemistri axhumanisayo njenge-polyisocyanates, i-polyaziridine noma i-carbodiimides ukuze kwakhe ukumbozwa kwe-2K okunezici ezithuthukisiwe.
Izembatho ezilapheka nge-UV ezitholakala emanzini seziphenduke izinketho ezithandwayo ezisetshenziswayo zokhuni zezimboni. Ikhabethe lekhishi kanye nabakhiqizi befenisha bakhetha lezi zembatho ngoba banokuphikiswa okuhle kakhulu kanye nezakhiwo zemishini, izakhiwo ezinhle kakhulu zokufaka isicelo kanye nokukhishwa kwe-solvent ephansi kakhulu. Izembatho ze-WB UV zinokumelana okuhle kakhulu kwebhulokhi ngokushesha ngemva kokwelashwa, okuvumela izingxenye ezimboziwe ukuthi zipakishwe, zipakishwe futhi zithunyelwe zisuka emugqeni wokukhiqiza ngaphandle kwesikhathi sokuhlala sokuthuthukiswa kokuqina. Ukuthuthukiswa kokuqina kwe-WB UV enamathela kuyamangaza futhi kwenzeka ngemizuzwana. Ukumelana kwamakhemikhali namabala kwezingubo ze-WB UV ziphakeme kunalezo zamavanishi okuguqula asuselwa ku-solvent.
Izingubo ze-WB UV zinezinzuzo eziningi zemvelo. Nakuba ama-oligomers e-UV aqinile angu-100% ngokuvamile ene-viscosity ephezulu futhi kufanele ahlanjululwe ngezincibilikizi ezisebenzayo, ama-WB UV PUDs ano-viscosity ephansi, futhi i-viscosity ingalungiswa ngeziguquli zendabuko ze-WB rheology. Ama-WB UV PUDs anesisindo samangqamuzana aphezulu ekuqaleni futhi awasakhi isisindo samangqamuzana njengoba elapha ngendlela emangazayo njengo-100% wezingubo eziqinile ze-UV. Ngenxa yokuthi anokuncipha okuncane noma awakho nhlobo njengoba elapha, ama-WB UV PUD anamathela kahle kakhulu kuma-substrates amaningi. I-gloss yalezi zembatho ilawulwa kalula ngama-agent ajwayelekile. Lawa ma-polymers angaba nzima kakhulu kodwa futhi aguquguquke ngokwedlulele, awenze amakhandidethi afanelekile wezingubo zokhuni zangaphandle.
Isikhathi sokuthumela: Mar-07-2024
