1.Yuav ua li cas qhov kub thiab txias cuam tshuam tus nqi ntawm cov tshuaj aging?
Txoj cai ob npaug ntawm cov tshuaj tiv thaiv kab mob: Raws li Van der Hoff txoj cai empirical, rau txhua txhua 10℃qhov kub thiab txias, tus nqi ntawm cov tshuaj tiv thaiv feem ntau nce li ntawm 2-4 zaug.
Kev cuam tshuam ntawm cov coatings: Txheej aging yog qhov tseem ceeb ntawm cov tshuaj lom neeg tsis sib haum xeeb, xws li oxidation thiab degradation (molecular saw breakage) ntawm resin polymers, thiab fading thiab chalking ntawm pigments.
Nyob rau hauv qhov kub thiab txias (piv txwv li, qhov kub thiab txias ntawm cov xim hlau daim hlau nyob rau hauv lub hnub ncaj qha mus txog 60-80 degree), cov tshuaj tiv thaiv no tau nrawm heev, ua rau cov txheej txheem ntxov ntxov:
Poob gloss thiab fading: Pigments thiab resins poob lawv cov khoom qub vim yog oxidation ceev.
Chalking: Surface resin decomposes, exposing pigment particles.
Embrynerateing thiab cracking: Resin molecular chains tawg, ua rau poob ntawm yooj.
2.Dab tsi yog qhov sib xyaw ua ke ntawm qhov kub thiab txias ntawm ultraviolet hluav taws xob?
Ultraviolet (UV) hluav taws xob yog lub luag haujlwm tseem ceeb rau kev rhuav tshem cov tshuaj lom neeg hauv cov txheej txheem. Cov kub kub ua kom muaj txiaj ntsig zoo ntawm UV hluav taws xob ntawm cov polymers.
Lub hnub ci khaus ntawm lub caij ntuj sov coj qhov muaj zog tshaj UV hluav taws xob thiab qhov kub siab tshaj plaws, ua rau lub caij ntuj sov lub caij ntuj sov rau txheej laus.
3.Dab tsi yog qhov sib xyaw ua ke ntawm qhov kub thiab av noo?
Qhov kub thiab txias ua rau kom nkag mus thiab nthuav tawm ntawm cov dej molecules (xws li dej vapor) hauv txheej txheej.
Thaum cov dej molecules nkag mus rau hauv txheej los yog ncav cuag qhov sib cuam tshuam ntawm cov txheej thiab cov substrate, qhov kub thiab txias ua rau cov tshuaj tiv thaiv hydrolysis, txhawb kev xeb thiab ua rau cov txheej txheem blister thiab tev tawm.
Qhov kev puas tsuaj no tshwj xeeb tshaj yog nyob rau hauv cov huab cua kub thiab av noo.
4.Dab tsi yog qhov synergistic los ntawm qhov kub thiab txias sib txawv cycling?
Qhov no yog kev puas tsuaj rau lub cev thiab lub cev, sib npaug tseem ceeb raws li kev puas tsuaj tshuaj tau hais los saum toj no.
Qhov kub thiab txias ntawm lub caij ntuj sov sib txawv ua rau rov ua kom thermal expansion thiab contraction ntawm cov xim -coated steel ntawv. Qhov sib txawv ntawm thermal expansion coefficients ntawm txheej txheej thiab cov hlau substrate ua rau muaj kev ntxhov siab tsis tu ncua ntawm lub interface.
Nyob rau tib lub sijhawm, qhov kev ntxhov siab cyclic no ua rau maj mam qaug zog ntawm cov txheej, ua rau microcracks thiab ua kom nrawm nrawm ntawm cov dej noo thiab corrosive media.
Qhov sib txawv ntawm qhov kub thiab txias ntau dua (piv txwv li, qhov kub thiab txias diurnal hloov pauv loj hauv thaj chaw suab puam), qhov hnyav dua qhov thermal stress fatigue.
5.Dab tsi yog qhov cuam tshuam ntawm qhov ntsuas kub tseem ceeb?
Cov cuab yeej tseem ceeb ntawm lub cev tsis zoo ntawm txheej txheej yog lawv cov iav hloov pauv kub (Tg).
Thaum lub ambient kub los yog tshaj lub Tg ntawm txheej, cov resin hloov los ntawm ib tug glassy xeev mus rau ib tug heev elastic xeev. Nws hardness, adhesion, thiab stain tsis kam txo qis heev, ua rau nws mos thiab tsis yooj yim, yog li ua kom cov txheej txheem laus sai.