{"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\/pt\/combination-of-different-light-stabilizers\/","title":{"rendered":"O efeito de prote\u00e7\u00e3o adicional da combina\u00e7\u00e3o de diferentes estabilizadores de luz"},"content":{"rendered":"<h1><strong>O efeito de prote\u00e7\u00e3o adicional da combina\u00e7\u00e3o de diferentes estabilizadores de luz<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Resposta r\u00e1pida:<\/strong> Para a sele\u00e7\u00e3o de mon\u00f4meros e resinas UV, a quest\u00e3o comercial chave n\u00e3o \u00e9 \"qual material \u00e9 o melhor em geral\", mas sim \"qual pacote oferece o equil\u00edbrio certo entre fluidez, cura, ades\u00e3o e durabilidade na aplica\u00e7\u00e3o real\".<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>As principais categorias de produtos de estabilizadores de luz usados para pol\u00edmeros org\u00e2nicos s\u00e3o absorvedores de UV, estabilizadores de luz de amina impedida, agentes de ruptura de estado excitado, decompositores de hidroper\u00f3xidos etc. Esses diferentes tipos de estabilizadores de luz t\u00eam diferentes graus de efeito na melhoria da estabiliza\u00e7\u00e3o de luz dos revestimentos de pol\u00edmeros. Na formula\u00e7\u00e3o real da estabiliza\u00e7\u00e3o de luz do revestimento, os t\u00e9cnicos geralmente usam uma combina\u00e7\u00e3o de dois ou mais mecanismos diferentes de estabilizadores de luz para obter um efeito de estabiliza\u00e7\u00e3o de luz mais eficaz e dur\u00e1vel no revestimento, que tem um efeito aditivo de 1 + 1 &gt; 2. Uma combina\u00e7\u00e3o mais cl\u00e1ssica \u00e9 o uso de absorvedor de UV com estabilizador de luz de amina impedida (HALS). O primeiro protege o revestimento contra a foto-oxida\u00e7\u00e3o na fonte, filtrando a luz UV nociva da luz solar, mas \u00e9 dif\u00edcil evitar a transforma\u00e7\u00e3o do consumo durante sua pr\u00f3pria a\u00e7\u00e3o c\u00edclica, com altera\u00e7\u00f5es irrevers\u00edveis, como desbotamento e fot\u00f3lise, e a concentra\u00e7\u00e3o efetiva diminui gradualmente e perde lentamente seu efeito fotoestabilizador. O HALS interrompe o processo de foto-oxida\u00e7\u00e3o removendo os radicais livres e os per\u00f3xidos do revestimento para manter o brilho do revestimento e inibir o amarelamento e a fragiliza\u00e7\u00e3o. No entanto, os radicais de nitrog\u00eanio-oxig\u00eanio gerados pelo HALS s\u00e3o basicamente coloridos e podem absorver a luz UV, o que tem a possibilidade de deple\u00e7\u00e3o fotol\u00edtica. A combina\u00e7\u00e3o do UV Absorber e do HALS pode desempenhar uma fun\u00e7\u00e3o complementar para proteger um ao outro, pois o UV Absorber filtra os raios UV prejudiciais e protege os radicais de nitrog\u00eanio-oxig\u00eanio da deple\u00e7\u00e3o fotol\u00edtica, enquanto o HALS elimina os radicais livres e os hidroper\u00f3xidos para proteger o UVA da deple\u00e7\u00e3o fotol\u00edtica. O UV Absorber \u00e9 protegido contra radicais livres e per\u00f3xidos. Complementando um ao outro, o UV Absorber e o HALS podem manter uma concentra\u00e7\u00e3o suficientemente alta durante o fotoenvelhecimento do revestimento por um longo per\u00edodo para aumentar o efeito de fotoestabiliza\u00e7\u00e3o.<\/p>\n<p>O gr\u00e1fico \u00e0 esquerda mostra a altera\u00e7\u00e3o na concentra\u00e7\u00e3o de radicais de \u00f3xido de nitrog\u00eanio no filme de um revestimento de copol\u00edmero de acrilato contendo unidades de estireno durante o processo de fotoenvelhecimento. No sistema que cont\u00e9m apenas HALS, os radicais de nitrog\u00eanio-oxig\u00eanio decaem rapidamente para n\u00edveis mais baixos depois de experimentarem concentra\u00e7\u00f5es mais altas por um curto per\u00edodo de tempo; enquanto no sistema combinado com o absorvedor de UV de benzotriazol, os radicais de nitrog\u00eanio-oxig\u00eanio dentro do filme podem ser mantidos em concentra\u00e7\u00f5es mais altas por um per\u00edodo de tempo mais longo.<\/p>\n<p>Quando combinado com o absorvedor de UV, o efeito de fotoestabiliza\u00e7\u00e3o do revestimento geralmente n\u00e3o \u00e9 ideal, pois se baseia nas caracter\u00edsticas de absor\u00e7\u00e3o de luz para desempenhar a efic\u00e1cia da decis\u00e3o. Quando combinado com o HALS, que tem um efeito de estabiliza\u00e7\u00e3o de luz maior, \u00e9 mais f\u00e1cil obter uma melhoria significativa no efeito de estabiliza\u00e7\u00e3o de luz.<\/p>\n<p>Conforme mostrado na figura acima, o efeito do absorvedor de UV em combina\u00e7\u00e3o com o HALS na estabilidade \u00e0 luz dos revestimentos de poliuretano alif\u00e1tico. No sistema com apenas benzotriazol UVA (Tinuvin234), a taxa de perda de liga\u00e7\u00e3o de uretano foi apenas um pouco menor do que a da amostra em branco \u00e0 medida que o tempo de fotoenvelhecimento aumentou; quando o HALS foi usado sozinho, o efeito de estabiliza\u00e7\u00e3o da luz melhorou bastante; quando o HALS foi combinado com uma quantidade igual de absorvedor de UV, o efeito de estabiliza\u00e7\u00e3o da luz melhorou ainda mais.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>Uma vis\u00e3o pr\u00e1tica de fornecimento e formula\u00e7\u00e3o de mon\u00f4meros e olig\u00f4meros UV<\/h2>\n<p>As formula\u00e7\u00f5es de UV de maior sucesso s\u00e3o constru\u00eddas escolhendo primeiro a base e, em seguida, ajustando o pacote de mon\u00f4meros reativos em torno do substrato, m\u00e9todo de cura e estresse de uso final. Isso geralmente produz um resultado mais est\u00e1vel do que escolher materiais apenas pela viscosidade ou pre\u00e7o.<\/p>\n<ul>\n<li><strong>Comece da propriedade final alvo:<\/strong> dureza, flexibilidade, ades\u00e3o e retra\u00e7\u00e3o raramente apontam para o mesmo pacote de mat\u00e9ria-prima.<\/li>\n<li><strong>Tela do pacote reativo como um todo:<\/strong> as escolhas de olig\u00f4mero, mon\u00f4mero e fotoiniciador interagem fortemente em sistemas UV.<\/li>\n<li><strong>Use a viscosidade como ferramenta, n\u00e3o como a \u00fanica regra de decis\u00e3o:<\/strong> o material mais f\u00e1cil de processar nem sempre \u00e9 o que tem melhor desempenho ap\u00f3s a cura.<\/li>\n<li><strong>Verifique o substrato real:<\/strong> pl\u00e1stico, metal, filme de etiqueta, sistemas de gel e revestimentos podem recompensar equil\u00edbrios de polaridade e densidade de cura muito diferentes.<\/li>\n<\/ul>\n<h3>Refer\u00eancias de produtos recomendadas<\/h3>\n<ul>\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<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/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 para compradores e formuladores<\/h3>\n<p><strong>Um mon\u00f4mero ou resina UV pode resolver todos os problemas de formula\u00e7\u00e3o?<\/strong><br \/>Geralmente n\u00e3o. F\u00f3rmulas comercialmente fortes dependem de como v\u00e1rios componentes trabalham juntos para equilibrar cura, ades\u00e3o, fluidez e durabilidade.<\/p>\n<p><strong>Por que os mon\u00f4meros devem ser rastreados juntamente com os olig\u00f4meros?<\/strong><br \/>Porque mon\u00f4meros podem alterar viscosidade, taxa de cura, retra\u00e7\u00e3o e comportamento do substrato o suficiente para modificar a classifica\u00e7\u00e3o final da mesma resina base.<\/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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