Epoxy UV curing resin yog dav siv nyob rau hauv cov teb ntawm hluav taws xob rwb thaiv tsev casting, anti-corrosion txheej, hlau bonding thiab thiaj li nyob rau vim hais tias ntawm nws cov high bonding zog, dav kev sib txuas nto, tsawg shrinkage, zoo stability, zoo heev hluav taws xob rwb thaiv tsev, siab mechanical zog thiab zoo processability.Nyob rau hauv xyoo tas los no, epoxy UV curing resin raws li kev lag luam tau vam meej.
Txawm li cas los xij, tam sim no, huab cua tsis kam ntawm cov khoom siv epoxy feem ntau yog qhov tsis muaj zog, tshwj xeeb tshaj yog nyob rau hauv kev tsim cov epoxy nplaum, coj potting nplaum, epoxy UV curing resin hniav nyiaj hniav kub nplaum, thiab lwm yam. Cov kev cai rau kev tiv thaiv yellowing kev ua tau zoo ntawm epoxy system.
Muaj ntau yam uas ua rau yellowing ntawm epoxy khoom: 1. Lub bisphenol ib tug qauv ntawm aromatic epoxy UV curing resin yog ib qho yooj yim rau oxidize los tsim carbonyl los ua yellowing pawg;2. Cov dawb amine tivthaiv nyob rau hauv amine curing tus neeg saib xyuas yog ncaj qha polymerized nrog epoxy UV curing resin, ua rau lub zos kub nce thiab ceev yellowing;3. Tertiary amine accelerators thiab nonylphenol accelerators yooj yim hloov xim nyob rau hauv cov pa kub thiab UV irradiation;4. Yog hais tias qhov kub thiab txias heev thaum lub sij hawm cov tshuaj tiv thaiv, cov residual impurities thiab hlau catalysts nyob rau hauv lub system yuav induce yellowing.
Txoj kev daws teeb meem zoo yog ntxiv cov tshuaj tua kab mob antioxidant thiab ultraviolet absorber, uas tuaj yeem tiv thaiv kom tsis txhob muaj xim daj.Txawm li cas los xij, muaj ntau hom tshuaj antioxidants, thiab xaiv cov khoom tsim nyog yuav tsum tau muaj qee yam kev txhawb nqa thiab kev ua tiav.
Kev faib tawm ntawm cov tshuaj antioxidants: ib qho tseem ceeb antioxidant: ntes peroxide dawb radicals, feem ntau cuam tshuam phenol antioxidants;Ib qho yog auxiliary antioxidant: decompose hydroperoxides, feem ntau yog phosphite esters thiab thioesters.Feem ntau, cov tshuaj antioxidants sib txawv tau pom zoo raws li cov txheej txheem tsim khoom, cov khoom siv raw, cov kuab tshuaj, cov khoom siv ntxiv thiab cov muab tub lim ntawm ntau lub tuam txhab, uas theem ntawm yellowing thiab degree ntawm yellowing.
Ultraviolet lub teeb kuj yog ib qho tseem ceeb culprit ua rau oxidation yellowing ntawm epoxy system, feem ntau yog los ntawm tshav ntuj.Yog li ntawd, tshwj xeeb tshaj yog rau cov neeg siv khoom uas cov khoom yuav tsum tau siv sab nraum zoov, peb yuav pom zoo kom ntxiv qee qhov ntawm UV absorber rau cov khoom, uas tuaj yeem nqus tau UV zoo thiab qeeb daj.Ntxiv mus, kev siv ultraviolet thiab antioxidant tuaj yeem ua rau muaj kev sib koom ua ke, nrog rau cov nyhuv 1 ntxiv rau 1 yog ntau dua 2.
Tau kawg, kev siv cov tshuaj tua kab mob antioxidant thiab ultraviolet absorbers tsis tuaj yeem daws qhov teeb meem ntawm yellowing, tab sis nyob rau hauv ib tug tej yam ntau yam thiab lub sij hawm, nws muaj peev xwm tiv thaiv oxidation yellowing ntawm cov khoom, ua kom cov xim ntawm cov khoom pob tshab thiab txhim kho qib ntawm cov khoom. .
Post lub sij hawm: May-09-2022