Nyob rau hauv feem ntau cov ntaub ntawv polymer, degradation yog ib tug undesirable txheej txheem. Nws feem ntau ua rau muaj kev hloov pauv hauv cov qauv tshuaj thiab lub cev ntawm cov polymer, ua rau poob ntawm ntau yam khoom muaj txiaj ntsig. UV degradation ntawm polymers tuaj yeem cuam tshuam qhov hnyav molecular, cuam tshuam tsis kam, elongation ntawm tawg, gloss thiab xim. Xws li kev puas tsuaj tuaj yeem ua rau qeeb qeeb los ntawm kev ntxiv cov huab cua stabilizers. Sib tham hauv kev nthuav dav cov hauv paus ntawm lub teeb stabilizers / UV absorbers thiab cov txheej txheem ntawm degradation hauv cov polymers sib txawv. Ntxiv rau, tau txais cov lus qhia rau xaiv qhov tsim nyog tshaj plaws lub teeb stabilizer / UV absorber rau koj daim ntawv thov polymer thiab cov qauv qauv.
Lub teeb stabilizers thiab UV absorbers yog xav tau nyob rau hauv polymers
Lub neej muaj txiaj ntsig ntawm polymers yog txwv los ntawm lawv cov degradation. Kev puas tsuaj tuaj yeem tshwm sim los ntawm ntau yam ib puag ncig xws li kub, av noo, impurities, mechanical loads, hluav taws xob, kab mob, tshuaj thiab huab cua.
Lub teeb stabilizers thiab UV absorbers tiv thaiv kev degradation ntawm polymers raws li kev cuam tshuam ntawm:
Hnub ci
ultraviolet rays
kub
react nrog oxygen
Piv txwv li, ob peb engineering thermoplastics xws li polyamides, uas feem ntau yog siv rau sab nraum zoov daim ntaub ntawv, yuav tsum tau ntev UV stability. Polybutylene terephthalate (PBT) tuaj yeem siv rau hauv cov xim pleev xim rau tsheb sab nrauv. Polyurethane-raws li cov khoom siv kawg xws li tsheb qhov rooj trims, dashboards, kauj log, qhov rais sealants, headrests thiab armrests, thiab khau khau khiab thaum raug tshav kub thiab lub teeb. Qhov no degradation ua rau discoloration thiab tsim cov kab nrib pleb.
Qhov sib ntxiv ntawm lub teeb stabilizers thiab UV absorbers rau polymer blends tuaj yeem txhim kho cov tsos / kev zoo nkauj thiab tag nrho lub neej ntev ntawm cov khoom. Kev xaiv ntawm lub teeb stabilizer / UV absorber feem ntau nyob ntawm lub substrate yuav tsum tau tiv thaiv, nws xav tau kev ua hauj lwm lub neej thiab nws susceptibility rau photodegradation.
Feem ntau siv lub teeb stabilizers hauv cov yas yog hindered amine teeb stabilizers (HALS).
Feem ntau UV absorbers yog benzotriazoles, benzophenones, thiab organonickel compounds.
UV Degradation cuam tshuam hauv Polymers
Cov nyhuv ntawm UV degradation ntawm polymers tuaj yeem raug soj ntsuam los ntawm cov xwm txheej hauv qab no.
