{"id":6172,"date":"2023-07-10T14:31:14","date_gmt":"2023-07-10T14:31:14","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=6172"},"modified":"2026-04-28T10:42:18","modified_gmt":"2026-04-28T10:42:18","slug":"what-is-the-light-aging-protection-of-uv-absorbers-for-coatings","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/what-is-the-light-aging-protection-of-uv-absorbers-for-coatings\/","title":{"rendered":"Qual \u00e9 a prote\u00e7\u00e3o contra o envelhecimento por luz dos absorvedores de UV para revestimentos?"},"content":{"rendered":"<p><!-- lc-qa-start --><\/p>\n<p><strong>Resposta r\u00e1pida:<\/strong> For antioxidant, UV absorber, and HALS topics, formulators usually compare long-term protection, process stability, and color control together because those priorities do not always point to the same additive.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>Qual \u00e9 a prote\u00e7\u00e3o contra o envelhecimento por luz dos absorvedores de UV para revestimentos?<\/p>\n<p>&nbsp;<\/p>\n<p>UV absorbers such as <a href=\"https:\/\/longchangchemical.com\/pt\/product\/uv-384-2\/\">Absorvedor de UV 384-2<\/a> used together with <a href=\"https:\/\/longchangchemical.com\/pt\/product\/light-stabilizer-292\/\">Estabilizador de luz 292<\/a> are effective in slowing down the light aging behavior of cured coatings. The addition of various suitable UV absorbers and light stabilizers to coating formulations is a well-established method of operation for organic coatings for outdoor use where high quality and longevity are required. UV absorbers such as EVERSORB 80, EVERSORB 93, etc. are classic anti-aging products.<\/p>\n<p>H\u00e1 muitas maneiras de caracterizar o desempenho do envelhecimento por luz dos revestimentos. No caso de pol\u00edmeros sem estrutura de carbonila, seu comportamento de envelhecimento \u00e0 luz pode ser caracterizado pela mudan\u00e7a do sinal de carbonila no espectro de absor\u00e7\u00e3o de infravermelho. No entanto, alguns revestimentos cont\u00eam carbonila de \u00e9ster, liga\u00e7\u00e3o de \u00e9ster de am\u00f4nia, etc., incluindo revestimentos UV de cura por luz, que n\u00e3o s\u00e3o adequados para usar o valor de carbonila para caracterizar o comportamento de envelhecimento \u00e0 luz. Nesse caso, podemos usar o \u00edndice de amarelamento (YI) para caracteriz\u00e1-los. O m\u00e9todo padr\u00e3o internacional segue a norma ASTM D1925, na qual o filme curado \u00e9 exposto \u00e0 luz UV e, ap\u00f3s cada per\u00edodo de exposi\u00e7\u00e3o, a transmit\u00e2ncia do filme curado em v\u00e1rios comprimentos de onda espec\u00edficos \u00e9 medida pelo espectrofot\u00f4metro UV-vis\u00edvel, e a fonte de irradia\u00e7\u00e3o pode ser uma l\u00e2mpada de merc\u00fario de press\u00e3o m\u00e9dia com vidro Pyrex filtrando a luz UV de onda curta abaixo de 320 nm.<\/p>\n<p>O \u00edndice de amarelecimento \u00e9 definido como.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>O teste de envelhecimento com o uso de fonte de luz artificial \u00e9 chamado de envelhecimento acelerado. O envelhecimento acelerado geralmente \u00e9 combinado com dispositivos adicionais, como umidade, temperatura, n\u00e9voa salina etc., para avaliar de forma mais objetiva e abrangente o desempenho antienvelhecimento do revestimento. Al\u00e9m da fonte de luz ultravioleta, a pot\u00eancia de algumas centenas de watts da l\u00e2mpada de xen\u00f4nio, sua sa\u00edda espectral de 250 nm de espectro cont\u00ednuo e a distribui\u00e7\u00e3o da banda espectral do sol s\u00e3o semelhantes \u00e0s comumente usadas na fonte de luz da m\u00e1quina de envelhecimento artificial. Outras fontes de luz de envelhecimento artificial incluem QUVA e QUVB. O QUVA \u00e9 uma sa\u00edda ultravioleta de onda longa, e o comprimento de onda de sa\u00edda do QUVB \u00e9 de 280 a 360 nm, com o centro localizado a 310 mm. mais primitivo, mas totalmente consistente com o envelhecimento natural do teste de envelhecimento da luz \u00e9 realizado sob luz solar direta, como nos Estados Unidos, o uso do teste de exposi\u00e7\u00e3o ao \u00e2ngulo de 45 graus da Fl\u00f3rida.<\/p>\n<p>Devido \u00e0 absor\u00e7\u00e3o do oz\u00f4nio atmosf\u00e9rico da Terra, a luz solar atrav\u00e9s da atmosfera at\u00e9 o solo, 295 nm abaixo da luz ultravioleta de ondas curtas de alta energia \u00e9 basicamente filtrada. Portanto, a luz solar do solo sobre o envelhecimento da luz do revestimento de pol\u00edmero tem um forte efeito sobre a faixa de comprimento de onda, concentrada principalmente entre 295 e 400 nm; quanto menor o comprimento de onda, maior a energia, o efeito do envelhecimento da luz do revestimento de pol\u00edmero ser\u00e1 mais intenso. Influenciada pela esta\u00e7\u00e3o do ano, hora, altitude, latitude, clima, polui\u00e7\u00e3o do ar e muitos outros fatores, a intensidade de UV da luz solar do solo pode mudar. A camada de oz\u00f4nio absorve a luz ultravioleta abaixo de 320 nm, mas com a polui\u00e7\u00e3o atmosf\u00e9rica e a destrui\u00e7\u00e3o da camada de oz\u00f4nio, a intensidade da luz ultravioleta de ondas curtas que chega ao solo aumenta a cada ano. O uso de diferentes fontes de luz para obter os resultados do envelhecimento da luz pode n\u00e3o ser consistente, principalmente devido \u00e0 variedade de distribui\u00e7\u00e3o de comprimento de onda da fonte de luz, intensidade, umidade ambiental, temperatura e outras condi\u00e7\u00f5es que n\u00e3o s\u00e3o completamente consistentes.<\/p>\n<p>Al\u00e9m do \u00edndice de amarelamento, o desempenho antienvelhecimento do filme curado tamb\u00e9m pode ser caracterizado pelo exame do espectro de absor\u00e7\u00e3o, brilho, emba\u00e7amento, ades\u00e3o, propriedades mec\u00e2nicas, comportamento mec\u00e2nico termodin\u00e2mico e outros indicadores de mudan\u00e7a. Devido \u00e0 predomin\u00e2ncia da foto-oxida\u00e7\u00e3o no processo de envelhecimento por luz, a altera\u00e7\u00e3o do \u00edndice de hidroxila ou do \u00edndice de per\u00f3xido no revestimento \u00e9 frequentemente usada como par\u00e2metro para refletir o envelhecimento por luz. Diferentes estruturas de pol\u00edmeros tamb\u00e9m podem ser caracterizadas de acordo com as altera\u00e7\u00f5es na concentra\u00e7\u00e3o de grupos sens\u00edveis.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical selection route for antioxidant, UV absorber, and HALS packages<\/h2>\n<p>Most stabilizer decisions work best when they are treated as package decisions rather than single-product decisions. Technical buyers usually get the strongest answer by reviewing long-term heat aging, process stability, weather exposure, and color sensitivity together.<\/p>\n<ul>\n<li><strong>Separate processing protection from long-term stability:<\/strong> the best additive for melt history is not always the same one that gives the best service-life retention.<\/li>\n<li><strong>Use synergy deliberately:<\/strong> many polymer and coating systems perform best when primary and secondary stabilizers are paired intentionally.<\/li>\n<li><strong>Review color and clarity requirements:<\/strong> clear, pale, food-contact, or white systems often need a tighter package than dark industrial products.<\/li>\n<li><strong>Check the real aging condition:<\/strong> heat, UV, humidity, and outdoor exposure can each change which stabilizer route is commercially strongest.<\/li>\n<\/ul>\n<h3>Refer\u00eancias de produtos recomendadas<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/cas-270586-78-2\/\">CHLUMINIT TMO<\/a>:<\/strong> A valuable comparison point when lower yellowing or TPO-replacement discussions matter.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/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\/pt\/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\/pt\/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<\/ul>\n<h3>FAQ para compradores e formuladores<\/h3>\n<p><strong>Why are stabilizer packages often stronger than a single additive?<\/strong><br \/>Because different products can protect different parts of the degradation pathway, so the package often covers more risk than one grade alone.<\/p>\n<p><strong>Does adding more antioxidant or UV stabilizer always improve performance?<\/strong><br \/>Not necessarily. Over-dosing can increase cost and sometimes create side effects, so most systems perform best inside a tested dosage window.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>UV absorbers and light stabilizers are effective in slowing down the light aging behavior of cured coatings. The addition of various suitable UV absorbers and light stabilizers to coating formulations<\/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-6172","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 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is the light aging protection of UV absorbers for coatings? - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"UV absorbers and light stabilizers are effective in slowing down the light aging behavior of cured coatings. 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