Optimal Performance ntawm UV Powder Coatings

Hmoov txheej kho los ntawm ultraviolet lub teeb (UV hmoov txheej) yog ib qho kev siv tshuab uas ua ke nrog qhov zoo ntawm thermosetting hmoov txheej nrog cov kua ultraviolet-kho txheej tshuab. Qhov sib txawv ntawm cov txheej txheem hmoov txheej yog tias melting thiab curing yog muab cais ua ob txoj kev sib txawv: thaum raug tshav kub, UV-kho cov hmoov txheej hmoov yaj thiab ntws mus rau hauv ib homogeneous zaj duab xis uas yog crosslinked tsuas yog thaum nws raug UV teeb. Qhov nrov tshaj plaws crosslinking mechanism siv rau cov thev naus laus zis no yog cov txheej txheem dawb radical: ua kom cov photoinitiators hauv cov yeeb yaj kiab molten los ntawm UV teeb ua rau tsim cov dawb radicals uas pib ua cov tshuaj tiv thaiv polymerization uas muaj cov resin ob daim ntawv cog lus.

Qhov kawg txheej nam thiab kev ua tau zoo nyob ntawm kev xaiv cov txheej txheem resin, photoinitiators, pigments, fillers, additives, hmoov txheej txheej txheem txheej txheem thiab curing tsis. Kev sib txuas ntawm kev ua tau zoo ntawm cov qauv tshwj xeeb thiab kev kho mob tuaj yeem raug soj ntsuam los ntawm kev siv qhov sib txawv photocalorimetry.

Kev ua kom zoo tshaj plaws ntawm UV hmoov txheej tsis ntev los no tau ua rau cov dej ntws tawm zoo heev, ua kom cov khoom ua tiav tiav ntawm qhov kub thiab txias li 100 ° C.Technological thiab economic txiaj ntsig piav qhia txog kev loj hlob ntawm UV hmoov tshuab.

Kev sib xyaw ua ke ntawm polyester thiab epoxy chemistry tsim rau UV hmoov tso cai rau cov txheej txheem nyuaj ntawm kev lag luam ntu xws li ntoo, ntoo sib xyaw, yas thiab hlau kom tau raws li qhov xav tau. Txawm hais tias "hybrid hmoov" combining polyester thiab epoxy resins tau paub ntau tshaj 20 xyoo nyob rau hauv thermosetting hmoov, qhov degree ntawm kev kho tau tiav ntawm qhov kub thiab txias (piv txwv li, 120 ° C) yuav "zoo txaus" tsuas yog tom qab lub sij hawm ntev kho. Hauv qhov sib piv, UV-kho cov hmoov txheej cov yeeb yaj kiab ua tiav cov lus qhia nruj tshaj plaws tom qab "ob peb feeb" hauv qab cua sov thiab UV teeb.