{"id":5598,"date":"2022-09-24T13:30:45","date_gmt":"2022-09-24T13:30:45","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5598"},"modified":"2026-04-28T10:42:09","modified_gmt":"2026-04-28T10:42:09","slug":"combination-of-different-light-stabilizers","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/nl\/combination-of-different-light-stabilizers\/","title":{"rendered":"Het additionele beschermingseffect van de combinatie van verschillende lichtstabilisatoren"},"content":{"rendered":"<h1><strong>Het additionele beschermingseffect van de combinatie van verschillende lichtstabilisatoren<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> For UV monomer and resin selection, the key commercial question is not \u201cwhich material is best in general\u201d but \u201cwhich package delivers the right balance of flow, cure, adhesion, and durability in the real application.\u201d<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>De belangrijkste productcategorie\u00ebn van lichtstabilisatoren die gebruikt worden voor organische polymeren zijn UV-absorbers, gehinderde amine lichtstabilisatoren, excited state bursting agents, hydroperoxide decomposers, enz. Deze verschillende soorten lichtstabilisatoren hebben een verschillend effect op het verbeteren van de lichtstabilisatie van polymeercoatings. In de feitelijke formulering van de lichtstabilisatie van coatings gebruiken technici vaak een combinatie van twee of meer verschillende mechanismen van lichtstabilisatoren om een effectiever en duurzamer lichtstabilisatie-effect op de coating te verkrijgen, dat een additief effect heeft van 1 + 1 &gt; 2. Een meer klassieke combinatie is het gebruik van twee of meer verschillende lichtstabilisatoren. Een meer klassieke combinatie is het gebruik van een UV-absorber met een gehinderde amine lichtstabilisator (HALS). De eerstgenoemde beschermt de coating tegen foto-oxidatie bij de bron door het schadelijke UV-licht uit zonlicht te filteren, maar het is moeilijk om te voorkomen dat het tijdens zijn eigen cyclische werking wordt omgezet, met onomkeerbare veranderingen zoals vervaging en fotolyse, en de effectieve concentratie neemt geleidelijk af en verliest langzaam zijn fotostabiliserende werking. HALS onderbreekt het foto-oxidatieproces door vrije radicalen en peroxiden uit de coating te verwijderen om de glans van de coating te behouden en vergeling en verbrossing tegen te gaan. De stikstof-zuurstof radicalen die door HALS worden gegenereerd zijn echter in principe gekleurd en kunnen UV-licht absorberen, wat de kans op fotolytische depletie met zich meebrengt. De combinatie van UV Absorber en HALS kan een complementaire rol spelen om elkaar te beschermen, aangezien UV Absorber schadelijke UV-stralen wegfiltert en stikstof-zuurstofradicalen beschermt tegen fotolytische depletie, terwijl HALS vrije radicalen en hydroperoxiden wegvangt om UVA te beschermen tegen fotolytische depletie. UV Absorber wordt beschermd tegen vrije radicalen en peroxiden. Door elkaar aan te vullen kunnen UV Absorber en HALS een voldoende hoge concentratie handhaven tijdens de fotoveroudering van de coating gedurende lange tijd om het fotostabiliserende effect te versterken.<\/p>\n<p>De grafiek links toont de verandering in de concentratie stikstofoxide-radicalen in de film van een acrylaatcopolymeercoating die styreeneenheden bevat tijdens het fotoverouderingsproces. In het systeem dat alleen HALS bevat, vervallen de stikstof-zuurstofradicalen snel naar lagere niveaus nadat ze gedurende korte tijd hogere concentraties hebben ervaren; terwijl in het gecombineerde systeem met benzotriazole UV-absorber de stikstof-zuurstofradicalen binnen de film gedurende langere tijd op hogere concentraties kunnen worden gehandhaafd.<\/p>\n<p>UV Absorber alleen, het effect van fotostabilisatie van de coating is vaak niet ideaal, want het is gebaseerd op de kenmerken van lichtabsorptie om de werkzaamheid van de beslissing te spelen. In combinatie met HALS, dat een hoger lichtstabilisatie-effect heeft, is het gemakkelijker om een aanzienlijke verbetering van het lichtstabilisatie-effect te verkrijgen.<\/p>\n<p>Zoals de bovenstaande figuur laat zien, is het effect van UV-absorber in combinatie met HALS op de lichtstabiliteit van alifatische polyurethaan coatings. In het systeem met alleen benzotriazool UVA (Tinuvin234) was de snelheid van urethaanbindingverlies slechts iets lager dan die van het blanco monster naarmate de verouderingstijd toenam; wanneer alleen HALS werd gebruikt, was het lichtstabilisatie-effect sterk verbeterd; wanneer HALS werd gecombineerd met een gelijke hoeveelheid UV-absorber, werd het lichtstabilisatie-effect verder verbeterd.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical sourcing and formulation view of UV monomers and oligomers<\/h2>\n<p>Most successful UV formulations are built by choosing the backbone first and then tuning the reactive monomer package around the substrate, cure method, and end-use stress. That usually produces a more stable result than choosing materials by viscosity or price alone.<\/p>\n<ul>\n<li><strong>Start from the final property target:<\/strong> hardness, flexibility, adhesion, and shrinkage rarely point to exactly the same raw-material package.<\/li>\n<li><strong>Screen the reactive package as a whole:<\/strong> oligomer, monomer, and photoinitiator choices interact strongly in UV systems.<\/li>\n<li><strong>Use viscosity as a tool, not the only decision rule:<\/strong> the easiest-processing material is not always the one that performs best after cure.<\/li>\n<li><strong>Check the real substrate:<\/strong> plastic, metal, label film, gel systems, and coatings can reward very different polarity and cure-density balances.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/nl\/product\/light-stabilizer-123-tinuvin-123-cas-129757-67-1\/\">CHLUMILS UV-123<\/a>:<\/strong> A strong HALS reference for weatherability-focused screens in coatings and polymers.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/nl\/product\/uv-5151-cas-104810-48-2\/\">CHLUMILS UV-5151<\/a>:<\/strong> A practical stabilizer-package reference when broader light-aging protection is needed.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/nl\/product\/light-stabilizer-770-tinuvin-770-cas-52829-07-9\/\">CHLUMILS UV-770<\/a>:<\/strong> A familiar HALS benchmark when weatherability and appearance retention are under review.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/nl\/product\/lcsorb-bp-1-cas-131-56-6\/\">CHLUMIUV BP-1<\/a>:<\/strong> A useful UV-absorber reference when absorption-based light protection is being screened.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Can one UV monomer or resin solve every formulation problem?<\/strong><br \/>Usually no. Commercially strong formulas depend on how several components work together to balance cure, adhesion, flow, and durability.<\/p>\n<p><strong>Why should monomers be screened together with oligomers?<\/strong><br \/>Because monomers can change viscosity, cure rate, shrinkage, and substrate behavior enough to alter the final ranking of the same backbone resin.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>The main product categories of light stabilizers used for organic polymers are UV absorbers, hindered amine light stabilizers, excited state bursting agents, hydroperoxide decomposers, etc. These different types of light<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-5598","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - 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