I-Waterborne (WB) Ikhemistri ye-UV ibonise ukukhula okubonakalayo kwiimarike zangaphakathi zokhuni zoshishino ngenxa yokuba iteknoloji ibonelela ngokusebenza okugqwesileyo, ukukhutshwa kwe-solvent ephantsi kunye nokwandisa ukusebenza kakuhle kwemveliso. Iinkqubo zokugquma kwe-UV zibonelela ngomsebenzisi wokugqibela izibonelelo zemichiza ebalaseleyo kunye nokumelana nokukrweleka, ukuchasana kwebhloko okugqwesileyo, ii-VOC eziphantsi kakhulu kunye nesixhobo esincinci esinendawo yokugcina efunekayo. Ezi nkqubo zineepropati ezithelekisa ngokufanelekileyo kunye neenkqubo ezimbini ze-urethane ngaphandle kweengxaki ze-crosslinkers ezinobungozi kunye neenkxalabo zobomi bembiza. Inkqubo iyonke inexabiso elifanelekileyo ngenxa yokunyuka kwezantya zemveliso kunye neendleko eziphantsi zamandla. Ezi zibonelelo zifanayo zinokuba luncedo kwizicelo zangaphandle ezifakwe kwifektri ezibandakanya iifestile kunye neefreyimu zecango, i-siding kunye nezinye i-millwork. La macandelo emarike ngokuqhelekileyo asebenzisa i-emulsions ye-acrylic kunye ne-polyurethane dispersions kuba inegloss egqwesileyo kunye nokugcina umbala, kwaye ibonisa ukuqina okuphezulu. Kolu phononongo, i-polyurethane-acrylic resins ezinomsebenzi we-UV ziye zavavanywa ngokweenkcukacha zeshishini kuzo zombini izicelo zomthi zangaphakathi nangaphandle.
Iintlobo ezintathu zeengubo ezisekelwe kwi-solvent zisetyenziswa ngokuqhelekileyo kwizicelo zokhuni zoshishino. I-nitrocellulose lacquer ngokuqhelekileyo i-low-solids blend ye-nitrocellulose kunye namafutha okanye i-alkyds esekelwe kwioli. Ezi ngubo zoma ngokukhawuleza kwaye zinamandla aphezulu eglosi. Ngokuqhelekileyo zisetyenziswa kwizicelo zefenitshala yokuhlala. Zine-advanteji yokuba tyheli ngokuhamba kwexesha kwaye zinokuba brittle. Kananjalo banengxaki yokunganyangeki ngamachiza. I-Nitrocellulose lacquers ine-VOC ephezulu kakhulu, ngokuqhelekileyo kwi-500 g / L okanye ngaphezulu. I-lacquers yangaphambili ye-catalyzed idibanisa i-nitrocellulose, i-oyile okanye i-alkyds esekelwe kwioli, i-plasticizers kunye ne-urea-formaldehyde. Basebenzisa i-acid catalyst ebuthathaka njenge-butyl acid phosphate. Ezi zogquma zinobomi beshelufu obumalunga neenyanga ezine. Zisetyenziswa kwifenitshala yeofisi, yeziko neyokuhlala. I-lacquers e-pre-catalyzed i-pre-catalyzed resistances engcono kune-nitrocellulose lacquers. Bakwanazo neeVOC eziphezulu kakhulu. Iivanishi zokuguqula ziyingxube ye-alkyds esekelwe kwioli, i-urea formaldehyde kunye ne-melamine. Basebenzisa i-acid catalyst eyomeleleyo efana ne-p-toluene sulfonic acid. Baphila ngembiza yeeyure ezingama-24 ukuya kwezingama-48. Zisetyenziselwa kwikhabhinethi yekhitshi, ifenitshala yeofisi kunye nezicelo zefenitshala yokuhlala. Iivanishi zokuguqula zineempawu ezingcono kakhulu zeentlobo ezintathu zeengubo ezisekelwe kwi-solvent ngokuqhelekileyo ezisetyenziselwa iinkuni zoshishino. Banee-VOC eziphezulu kakhulu kunye nokukhutshwa kwe-formaldehyde.
Amanzi-based self-crosslinking emulsions ye-acrylic kunye ne-polyurethane dispersions ingaba yindlela ebalaseleyo kwiimveliso ezisekelwe kwi-solvent kwizicelo zemithi yoshishino. I-emulsions ye-Acrylic inika ikhemikhali elungileyo kakhulu kunye nokumelana nebhloko, amaxabiso aphezulu okuqina, ukuqina okugqwesileyo kunye nokuqina kwemozulu, kunye nokuphucula ukunamathela kwiindawo ezingezizo. Banamaxesha omileyo okukhawulezayo, okwenza ukuba ikhabhinethi, ifenitshala okanye umvelisi wemveliso yokwakha aphathe iinxalenye ngokukhawuleza emva kokufakwa kwesicelo. IiPUDs zibonelela ngokugqwesa ukuxhathisa kwe-abrasion, ukuguquguquka, kunye nokukrwela kunye nokumelana ne-mar. Amaqabane adibanisa kakuhle kunye ne-emulsions ye-acrylic ukuphucula iimpawu zomatshini. Zomibini i-emulsions ye-acrylic kunye ne-PUD inokusabela nge-crosslinking chemistries efana ne-polyisocyanates, i-polyaziridine okanye i-carbodiimides ukwenza iingubo ze-2K ezineempawu eziphuculweyo.
Iingubo ezinyangekayo ze-UV eziphuma emanzini ziye zaba lukhetho oludumileyo kwizicelo zomthi weshishini. Ikhabhinethi yekhitshi kunye nabavelisi befenitshala bakhetha ezi zogquma ngenxa yokuba banokuxhathisa okugqwesileyo kunye neempawu zomatshini, iipropati zesicelo ezigqwesileyo kunye nokukhutshwa kwe-solvent ephantsi kakhulu. Iingubo ze-WB ze-UV zinokumelana okugqwesileyo kwebhloko ngoko nangoko emva konyango, evumela iindawo ezigqunyiweyo ukuba zipakishwe, zipakishwe kwaye zithunyelwe kanye ngaphandle komgca wemveliso ngaphandle kwexesha lokuhlala lophuhliso lobunzima. Ukukhula kobunzima kwi-WB UV yokugquma kuyamangalisa kwaye kwenzeka ngemizuzwana. Ukunganyangeki kweekhemikhali kunye nebala le-WB UV yokugquma iphezulu kune-solvent-based conversion varnishes.
Iingubo ze-WB UV zineenzuzo ezininzi zendalo. Ngelixa i-100% -i-oligomers eqinile ye-UV iphezulu kwi-viscosity kwaye kufuneka ihlanjululwe nge-diluents esebenzayo, ii-WB UV PUDs ziphantsi kwi-viscosity, kwaye i-viscosity inokulungiswa kunye nezimodifitha ze-rheology ze-WB. Ii-UV ze-WB ze-UV zinobunzima bokuqala bemolekyuli kwaye abukhi ubunzima bemolekyuli njengoko zinyanga ngokumangalisayo njenge-100% yeengubo eziqinileyo ze-UV. Ngenxa yokuba incinci okanye ayinayo i-shrinkage njengoko iphilisa, ii-WB UV PUDs zinokunamathela okugqwesileyo kwii-substrates ezininzi. Iglosi yale ngubo ilawulwa ngokulula kunye nee-agent zokuthambisa zendabuko. Ezi polymers zinokuba nzima kakhulu kodwa zibhetyebhetye kakhulu, zibenze babe ngabagqatswa abafanelekileyo bokwaleka komthi wangaphandle.
Ixesha lokuposa: Mar-07-2024
