Thaum cov coatings raug rau sab nraum zoov, yam xws li ya raws, tshav kub thiab UV hluav taws xob tuaj yeem ua rau lawv degrade.Feem ntau hais lus, cov khoom raug cuam tshuam tshaj plaws hauv cov txheej txheem yog zaj duab xis tsim cov resins thiab hmoov.Cov hluav taws xob ultraviolet thiab dej ua rau cov ntaub ntawv no mus rau cov tshuaj degradation, thiab cov kev cuam tshuam degradation no yuav nrawm dua thaum kub nce.Lub degradation ntawm cov coatings tshwm sim los ntawm ultraviolet hluav taws xob feem ntau hu ua photooxidation.Cov tshuaj tiv thaiv yog tshwm sim los ntawm ultraviolet hluav taws xob.Oxygen nyob rau hauv cov huab cua yog koom nrog cov tshuaj degradation.Cov tshuaj photon-absorbing no yog hu ua chromophores thiab tuaj yeem yog cov pab pawg kawg ntawm cov xim pigment, nraub qaum lossis polymer binders, impurities, residual solvents, lossis additives.Thaum cov photons absorbed, lub chromophore emits zog.Cov txheej txheem no feem ntau ua tiav los ntawm kev rhuav tshem covalent daim ntawv cog lus los tsim ob lub dawb radicals.Cov radicals no feem ntau ua rau cov pa oxygen thiab ua ke nrog cov pa oxygen los tsim cov pa dawb radicals.Ib zaug tsim, cov radicals no tuaj yeem rhuav tshem lwm cov tshuaj organic los ntawm ntau cov kauj ruam tshuaj, tsim kom muaj cov tshuaj tiv thaiv kab mob uas ua rau cov polymer degradation.Nyob ntawm cov polymer, qhov nce lossis txo qhov sib txuas ntawm qhov sib txuas, lossis ntau dua lossis tsawg dua ntawm cov molecules, tuaj yeem pom.Cov qub tuaj yeem ua rau txheej txheej tawg;Cov tom kawg tuaj yeem ua rau txheej viscidity, hnyav tsis kam lossis khawb tsis kam.Thiab cov xim gloss yuav ploj, thiab xim yuav hloov.
Ntxiv nrog rau photooxidation, zaj duab xis tsim cov resin nyob rau hauv lub txheej yuav degraded los ntawm hydrolysis, tshwj xeeb tshaj yog thaum lub kub ntawm txheej yog nce nyob rau hauv lub hnub ci siab.Nyob rau hauv cov xwm txheej no, absorbed dej molecules nyob rau hauv lub txheej tuaj yeem tawm tsam covalent bonds hauv cov resin thiab txiav cov polymer chains, uas ua rau qhov hnyav molecular.Polyester thiab alkyd resins muaj qhov cuam tshuam rau cov nyhuv no ntau dua li polyurethanes thiab epoxies.
| KHOOM | CAS NO | EQUIVALENT | Kev piav qhia |
| UV 1 | 57834-33-0 | UV1 yog ib qho zoo heev los tiv thaiv uv additive, dav siv hauv polyurethane, nplaum, ua npuas ncauj thiab lwm yam ntaub ntawv. | |
| UV3303 | 586400-06-8 | UV3 tau pom zoo hauv PU (TPU, RIM) thiab cov yas engineering (PET, PC, PC, ABS, PA, PBT) | |
| UV3331 | 147783-69-5 | SANDUVOR PR 31 | UV 3331 yog qhov cuam tshuam amine teeb stabilizer (HALS) nrog rau UV absorber functionality.Nws yog characterized los ntawm nws zoo heev efficiency thiab nws muaj peev xwm yuav tsau rau hauv lub binder los yog polymer matrix thaum raug UV. UV3331 tuaj yeem siv rau hauv polyolefine, polystyrene yas, PVC, PBT thiab lwm yam ntaub ntawv. |
| UV3325 | 7443-25-6
| SANDUVOR PR 25 | UV 3325 yog UV-B absorber rau PVC, polyesters, PC, polyamides, styrene plastics, EVA copolymer, thiab cellulosics.
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| SIB 123 | 129757-67-1 | TIAB SA 123 | LS123 yog siv rau hauv cov txheej txheem tsheb, cov txheej txheem kev lag luam, cov txheej txheem zoo nkauj, cov txheej txheem ntoo, tshwj xeeb tshaj yog rau cov khib nyiab siab, acid curing automotive thiab cov xim muaj xim. |
| SIB 292 | 41556-26-7 82919-37-7 ib | TIAB SA 292 | LS292 tuaj yeem tiv thaiv kev tawg, poob ntawm lub teeb thiab lwm yam kab mob lacquer, tuaj yeem txhim kho lub neej kev pab cuam ntawm txheej txheej, thiab cov khoom ntawm chav tsev kub yuav tsis crystallize. |
| SIB 765 | 41556-26-7 82919-37-7 ib | TIAB SA 765 | LS765 yog siv rau hauv cov txheej txheem, tshwj xeeb tshaj yog cov tshuaj pleev xim rau tsheb kom tiv thaiv kev laus. LS765 yog ib qho zoo heev ua kua stabilizer rau ntau yam polymers thiab daim ntaub ntawv, xws li polyurethanes, sealants, adhesives, elastomers, unsaturated polyesters, acrylics, vinyl polymers (PVB, PVC), styrene homopolymers thiab copolymer, polyene ntsug, kua xim concentrates thiab Lwm cov organic substrate. |