Cov tsheb npav sab hauv ua haujlwm nyob rau hauv cov xwm txheej hnyav heev: ntev - raug tshav ntuj, siab hauv - chav tsev kub, thiab hluav taws xob ultraviolet tsis tu ncua. Lub sijhawm ntev UV nkag los ntawm lub qhov rais iav yog qhov ua rau sab hauv degradation, ua rau muaj teeb meem xws li fading, yellowing, nto tawg, thiab cov khoom embrittlement. Cov teeb meem kev laus no rhuav tshem kev zoo nkauj sab hauv, ua rau lub neej ua haujlwm luv luv, thiab coj cov nqi kho mob siab thiab hloov pauv rau cov neeg tsav nkoj. Piv nrog rau cov khoom siv yas zoo li ABS, ASA (Acrylonitrile Styrene Acrylate) sawv tawm nrog qhov zoo tshaj UV tiv thaiv, dhau los ua - cov khoom siv rau cov tsheb npav niaj hnub hauv kev tsim khoom thiab kho dua tshiab.
Qhov zoo ntawm UV ruaj khov ntawm ASA yog los ntawm nws cov qauv molecular optimized, uas yog qhov tseem ceeb ntawm cov yas zoo tib yam. Ib txwm ABS resin muaj unsaturated butadiene ob daim ntawv cog lus hauv nws cov saw hlau molecular. Cov qauv tsis yooj yim no tau yooj yim puas los ntawm UV rays, ua rau molecular saw breakage, oxidation thiab irreversible khoom aging nyob rau hauv ntev - hnub ci hluav taws xob. Nyob rau hauv sib piv, ASA hloov cov rhiab heev butadiene tivthaiv nrog saturated acrylate elastomer, tshem tawm tag nrho UV degradation tsis muaj zog. Nws tuaj yeem nqus tau zoo thiab thaiv cov hluav taws xob ultraviolet los ntawm qhov chaw, xa ntau tshaj kaum npaug ntawm UV tsis kam ntawm cov khoom siv ABS. Nws ruaj khov saturated molecular qauv kuj tiv thaiv oxidation thiab cross-txuas tsis ua hauj lwm nyob rau hauv tas li UV raug.
Hauv cov xwm txheej ua haujlwm hauv tsheb npav tiag tiag, ASA tus hwm UV thiab huab cua tiv thaiv qhia pom qhov zoo dua. Txawm hais tias nyob rau hauv kev tsav tsheb lossis chaw nres tsheb, tsheb npav sab hauv tau raug tshav ntuj ncaj qha txhua xyoo puag ncig. Nyob rau lub caij ntuj sov, qhov kub ntawm lub tsev kaw tau tshaj 60 degree, thiab kev sib xyaw ua ke ntawm cov cua sov thiab UV rays zoo heev ua rau kev laus ntawm cov khoom siv sab hauv zoo tib yam. Tom qab kev ua haujlwm ntev - lub sij hawm UV aging tests, ASA cov ntaub ntawv qhia tsis pom tseeb xim txawv thiab gloss. Nws tas li tswj cov xim tsis sib xws thiab tag nrho saum npoo luster, kom tsis txhob yellowing, mottling thiab fading. Lub caij no, nws cov kev tiv thaiv UV zoo heev khaws cia cov khoom siv ntawm cov khoom siv sab hauv, tiv thaiv cov panels, handrails, hniav strips thiab lwm yam khoom los ntawm kev tawg thiab tawg tsis ua hauj lwm.
Tshaj li qhov tseem ceeb ntawm UV tsis kam, ASA ntsuas qhov ua tau zoo thiab tus nqi - ua haujlwm tau zoo rau tag nrho - daim ntawv thov tsheb npav sab hauv. Nws tau txais lub siab rigidity, muaj zog tiv thaiv thiab kev ua tau zoo ntawm engineering plastics, txhawb kev txhaj tshuaj molding ntawm ntau yam zoo li tus sab hauv kom tau raws li tus kheej tsim kev xav tau ntawm cov qauv tsheb npav sib txawv. Nws ntev -ntev los tiv thaiv- kev laus ua haujlwm tau txo qis hauv kev saib xyuas sab hauv thiab cov nqi khiav lag luam. Tsis tas li ntawd, qhov ruaj khov thiab huv si sab hauv ib puag ncig zoo heev txhim kho cov neeg caij tsheb kev mus ncig.
Raws li qhov siab - huab cua ua tau zoo- cov khoom siv tiv taus, ASA kom daws tau qhov mob ntawm UV aging ntawm lub tsheb npav sab hauv. Nrog txhim khu kev qha UV tsis kam, kev ruaj ntseg thiab tus nqi zoo, nws tau dhau los ua cov khoom siv txhim kho tseem ceeb rau lub ntiaj teb tsheb npav thiab kev cob qhia kev lag luam, dav siv hauv cov neeg caij tsheb npav, tsheb npav ncig xyuas thiab kev lag luam tsheb sab hauv kev txhawb nqa.