ABS cov ntaub ntawv muaj cov tawv tawv zoo heev, siab tawv, yooj yim ntawm kev ua, thiab tus nqi -kev ua tau zoo, ua rau lawv siv dav hauv kev tshaj tawm sab nraum zoov, cov khoom siv tsheb, cov chaw hauv nroog, thiab cov khoom vaj tse. Txawm li cas los xij, cov ntawv ABS txheem muaj qhov tsis zoo UV tsis kam; Ntev ntev sab nraum zoov ua rau muaj teeb meem kev laus xws li yellowing, embrittlement, cracking, thiab chalking. Cov teeb meem no ua rau muaj kev poob qis hauv kev siv tshuab thiab ua rau lub neej ua haujlwm luv luv, yog li txwv kev siv sab nraum zoov. Txhawm rau hais txog qhov tsis muaj zog no, UV tiv thaiv ntawm ABS cov ntawv tuaj yeem txhim kho tau zoo los ntawm kev nkag siab txog kev laus ntawm cov txheej txheem xws li kev hloov kho cov khoom siv raw, kev tiv thaiv saum npoo, kev kho kom zoo dua qub, thiab kev saib xyuas kev tshawb fawb.
ABS yog copolymer ntawm acrylonitrile, butadiene, thiab styrene, nrog rau butadiene roj hmab theem ua hauj lwm raws li qhov tsis muaj zog taw tes rau UV tsis kam. Siab-lub zog UV lub teeb nthwv dej cuam tshuam qhov tsis txaus ntseeg ob daim ntawv cog lus hauv cov molecules, ua rau cov saw hlau molecular scission thiab oxidative cross- txuas. Ua ke nrog cov duab-induced thermo-oxidative aging, qhov no thaum kawg ua rau kev puas tsuaj ntawm daim ntawv cov qauv thiab poob ntawm kev ua tau zoo- yog vim li cas rau cov khoom tsis zoo weatherability. Kev lag luam muaj ntau yam kev hloov kho uas paub tab uas sib npaug tiv thaiv kev ua tau zoo, cov nqi tsim khoom, thiab cov khoom siv hauv lub cev.
Kev sib xyaw cov khoom ntxiv rau hauv cov khoom siv raw yog ib txoj hauv kev los txhim kho UV tiv thaiv ntawm qhov chaw thiab tsim nyog rau loj- nplai ntau lawm. Thaum lub sij hawm tsim cov ntawv, kev sib xyaw ntawm UV absorbers thiab hindered amine teeb stabilizers (HALS) tuaj yeem ntxiv. UV absorbers hloov UV lub teeb rau hauv lub zog thermal tsis zoo, tiv thaiv lub teeb los ntawm kev puas tsuaj rau lub substrate, thaum HALS scavenge aging -inducing dawb radicals thiab inhibit oxidation. Cov qib ntxiv yuav tsum tau ua tib zoo tswj ntawm 0.1% thiab 0.5%; Cov nyiaj ntau dhau cuam tshuam qhov toughness, thaum cov nyiaj tsis txaus txwv kev tiv thaiv. Kev koom ua ke cov tshuaj tiv thaiv antioxidants lossis cov khoom ua kom zoo-xws li carbon dub lossis titanium dioxide- tuaj yeem cuam tshuam UV teeb ntxiv thiab tiv thaiv kev laus, yog li txhim kho huab cua.
Cov txheej txheej saum npoo yog tus nqi - tau txais txiaj ntsig zoo - kev hloov kho tsim nyog rau ntau daim ntawv tsim. Kev siv tshwj xeeb UV- cov coatings resistant-xws li acrylic, polyurethane, los yog silicone- tsim cov yeeb yaj kiab tiv thaiv ntom ntom ntawm daim ntawv saum npoo, tiv thaiv UV hluav taws xob, los nag, thiab plua plav. Cov coatings no muaj zog adhesion, khaws cov ntawv qub zoo nkauj thiab cov khoom, thiab tso cai rau kev siv yooj yim thiab kho. Cov ntawv qub tuaj yeem rov qab los rau lawv lub xeev tiv thaiv los ntawm kev xuab zeb, kho dua tshiab, thiab rov ua dua tshiab, ua rau lawv tsim nyog rau kev tiv thaiv sab nraum zoov hauv me me - mus rau - cov khoom nruab nrab thiab cov khoom siv kho mob.
Txhawm rau ua kom tau raws li qhov xav tau rau siab -kawg daim ntawv thov sab nraum zoov uas xav tau kev tiv thaiv huab cua zoo dua, lub tswv yim hloov pauv polymer tuaj yeem ua haujlwm. Los ntawm kev sib xyaw ABS nrog ASA (uas tsis muaj qhov tsis txaus ntseeg ob daim ntawv cog lus thiab muaj kev tiv thaiv UV zoo heev) thiab PC resin, cov khoom siv ua ke ua haujlwm yooj yim thiab siab tawv ntawm ABS nrog cov huab cua ntawm ASA, hauv paus daws teeb meem UV- ntxias cov laus ntawm qib substrate. Cov ntawv hloov kho no yuav tsum tsis muaj txheej txheej ntxiv; lawv muab cov huab cua tsis sib xws thoob plaws, zoo heev tiv thaiv kom daj thiab tawg, thiab tsim nyog rau qhov chaw hnyav uas cuam tshuam nrog lub hnub raug lub hnub ntev thiab qhov kub thiab txias hloov pauv loj- ua rau lawv qhov kev xaiv tseem ceeb rau siab - kawg cov khoom sab nraum zoov.
Kev txhim kho thiab tu kom zoo tuaj yeem pab ncua kev laus ntawm daim ntawv. Kev ntsuas kev teeb tsa xws li ntxiv cov duab ntxoov ntxoo lossis cov dej tsis sib haum tuaj yeem txo qhov ncaj qha UV raug thiab dej nag yaig, thaum kev tu tsis tu ncua tiv thaiv cov av nkos uas tuaj yeem mloog zoo rau lub teeb thiab ua kom cov laus hauv zos. Tsis tas li ntawd, cov kev daws teeb meem tuaj yeem ua raws li cov kev xav tau tshwj xeeb: kev hloov kho yooj yim ntxiv rau kev siv sab hauv tsev, "additive plus coating" dual kev tiv thaiv rau sab nraum zoov siv, thiab sib tov - hloov cov nplooj ntawv rau siab - kawg daim ntawv thov, yog li ua tiav cov nqi tsim nyog thiab kev tiv thaiv zoo.
Hauv cov ntsiab lus, qhov teeb meem ntawm UV-induced aging hauv ABS cov ntawv tuaj yeem hais tau zoo los ntawm kev tiv thaiv kev tiv thaiv thiab cov phiaj xwm phiaj xwm. Ib txoj hauv kev zoo-xws li los ntawm kev hloov pauv substrate ntawm qhov chaw thiab kev tiv thaiv saum npoo mus rau siab- kev txhim kho kev sib xyaw ua ke thiab kev saib xyuas tsis tu ncua- tau txais txiaj ntsig zoo rau cov khoom siv los ntawm cov kev txwv ntawm huab cua tsis kam. Los ntawm kev tshawb fawb xaiv cov kev daws teeb meem, cov tuam txhab lag luam tuaj yeem khaws cov kev ua tau zoo thiab kev ua tau zoo ntawm cov ntawv ABS thaum muaj kev tiv thaiv UV degradation, tiv thaiv cov teeb meem xws li daj, tawg, thiab chalking, thiab nthuav dav rau sab nraum zoov daim ntawv thov kev ua tau zoo thaum txhim kho cov khoom lifespan thiab tag nrho cov nqi-effectiveness.
