{"id":8845,"date":"2025-09-08T10:04:24","date_gmt":"2025-09-08T10:04:24","guid":{"rendered":"https:\/\/changhongchemical.com\/?p=8845"},"modified":"2026-04-27T11:16:01","modified_gmt":"2026-04-27T11:16:01","slug":"guidelines-for-selecting-photoinitiators-in-uv-coating-formulations","status":"publish","type":"post","link":"https:\/\/changhongchemical.com\/pt\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\/","title":{"rendered":"Diretrizes para a sele\u00e7\u00e3o de fotoiniciadores em formula\u00e7\u00f5es de revestimento UV"},"content":{"rendered":"<h1><strong>Diretrizes para a sele\u00e7\u00e3o de fotoiniciadores em formula\u00e7\u00f5es de revestimento UV<\/strong><\/h1>\n<p><strong><b>Vis\u00e3o geral dos fotoiniciadores<\/b><\/strong><\/p>\n<p>- Nos produtos de cura por luz, os fotoiniciadores s\u00e3o um componente essencial. Eles s\u00e3o subst\u00e2ncias capazes de absorver energia radiante e passar por rea\u00e7\u00f5es qu\u00edmicas para gerar intermedi\u00e1rios reativos (radicais livres ou c\u00e1tions) com capacidade de iniciar a polimeriza\u00e7\u00e3o.<\/p>\n<p>- Na produ\u00e7\u00e3o pr\u00e1tica, os fotoiniciadores radicais que geram radicais livres s\u00e3o usados predominantemente, enquanto os fotoiniciadores cati\u00f4nicos que produzem c\u00e1tions s\u00e3o extremamente raros. Este artigo se concentra nos fotoiniciadores radicais.<\/p>\n<p><strong><b>Classifica\u00e7\u00e3o dos fotoiniciadores<\/b><\/strong><\/p>\n<ul>\n<li>Os fotoiniciadores radicais s\u00e3o categorizados principalmente em dois tipos, com base em seu mecanismo de gera\u00e7\u00e3o de radicais ativos: fotoiniciadores radicais do tipo clivagem (tamb\u00e9m conhecidos como fotoiniciadores do Tipo I) e fotoiniciadores radicais de remo\u00e7\u00e3o de hidrog\u00eanio (tamb\u00e9m conhecidos como fotoiniciadores do Tipo II).<\/li>\n<li>Common cleaving-type photoinitiators are structurally predominantly arylalkyl ketone compounds. Commonly available grades include: 184, 2959, 651, 907, 369, <a href=\"https:\/\/changhongchemical.com\/product\/irgacure-1173-cas-7473-98-5\/\">1173<\/a>, 819, TPO, MBF, 754, etc.<\/li>\n<li>Os fotoiniciadores comuns de redu\u00e7\u00e3o de hidrog\u00eanio s\u00e3o estruturalmente derivados de benzofenonas ou cetonas heteroc\u00edclicas. Os tipos comumente dispon\u00edveis incluem: BP, ITX, 2-EA. Al\u00e9m disso, os fotoiniciadores que eliminam o hidrog\u00eanio requerem co-iniciadores para ativa\u00e7\u00e3o. Atualmente, os principais co-iniciadores usados s\u00e3o aminas reativas e \u00e9steres benz\u00f3icos do tipo amina terci\u00e1ria.<\/li>\n<\/ul>\n<p><strong><b>Sele\u00e7\u00e3o de fotoiniciadores<\/b><\/strong><\/p>\n<p>A efic\u00e1cia dos fotoiniciadores no desencadeamento de rea\u00e7\u00f5es de polimeriza\u00e7\u00e3o em produtos cur\u00e1veis \u00e0 luz - e, por fim, na obten\u00e7\u00e3o do desempenho desejado - depende da intera\u00e7\u00e3o harmoniosa entre o sistema de fotoinicia\u00e7\u00e3o, as condi\u00e7\u00f5es de irradia\u00e7\u00e3o e os componentes do produto. Portanto, a sele\u00e7\u00e3o de fotoiniciadores apropriados com base em processos de produ\u00e7\u00e3o e formula\u00e7\u00f5es de produtos espec\u00edficos \u00e9 particularmente crucial.<\/p>\n<p>As se\u00e7\u00f5es a seguir detalhar\u00e3o os m\u00e9todos de triagem de fotoiniciadores, examinando suas propriedades e ilustrando-os por meio de estudos de caso espec\u00edficos.<\/p>\n<p><strong><b>O espectro de absor\u00e7\u00e3o do fotoiniciador deve corresponder ao espectro de emiss\u00e3o da fonte de luz.<\/b><\/strong><\/p>\n<p>As fontes de luz comuns no mercado incluem l\u00e2mpadas de merc\u00fario, l\u00e2mpadas de LED, l\u00e2mpadas de indu\u00e7\u00e3o e l\u00e2mpadas de haleto met\u00e1lico. Entre elas, as l\u00e2mpadas de merc\u00fario s\u00e3o as mais usadas, emitindo um espectro entre 200-450nm e servindo como op\u00e7\u00e3o de uso geral. As l\u00e2mpadas de LED s\u00e3o amplamente utilizadas em aplica\u00e7\u00f5es de cura de baixa energia, com comprimentos de onda de emiss\u00e3o concentrados em torno de 365\/375\/385\/395\/405 nm.<\/p>\n<p>Ao selecionar um fotoiniciador, escolha um que apresente caracter\u00edsticas de absor\u00e7\u00e3o significativas na faixa de comprimento de onda correspondente do espectro de emiss\u00e3o da fonte de luz.<\/p>\n<p><strong><b>Estudo de caso: <\/b><\/strong><\/p>\n<p>Nas formula\u00e7\u00f5es de esmalte em gel, a sele\u00e7\u00e3o do fotoiniciador \u00e9 fortemente limitada pela fonte de luz. As l\u00e2mpadas comuns para unhas usam dois tipos de tubos: fluorescente e LED. Os tubos fluorescentes emitem entre 370 e 420 nm, enquanto os tubos de LED emitem em torno de 365 nm\/395 nm. Ambos emitem na regi\u00e3o de ondas longas, exigindo iniciadores que absorvam comprimentos de onda mais longos.<\/p>\n<p>A Tabela 1 lista os picos de absor\u00e7\u00e3o de v\u00e1rios fotoiniciadores comuns. Para obter a inicia\u00e7\u00e3o ideal, devem ser selecionados fotoiniciadores com picos de absor\u00e7\u00e3o acima de 365 nm, como o TPO e o 819. Embora o 784 tenha um comprimento de onda de pico de absor\u00e7\u00e3o mais longo, seu alto custo limita sua ado\u00e7\u00e3o no mercado.<\/p>\n<p>Em testes pr\u00e1ticos, o TPO e o 819 demonstraram o melhor desempenho entre todos os fotoiniciadores, de acordo com os resultados previstos.<\/p>\n<p><strong><b><img decoding=\"async\" class=\"alignnone size-full wp-image-8847\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1.webp\" alt=\"\" width=\"1920\" height=\"1325\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1.webp 1920w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1-768x530.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1-1536x1060.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1-18x12.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1-1043x720.webp 1043w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1-600x414.webp 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>Sele\u00e7\u00e3o de fotoiniciadores para cura profunda em sistemas coloridos<\/b><\/strong><\/p>\n<ul>\n<li>Em sistemas coloridos, especialmente os de cor escura, os pr\u00f3prios pigmentos absorvem uma parte da energia UV, impedindo que a luz UV penetre no filme de tinta. Isso impede que os fotoiniciadores de camada profunda absorvam energia suficiente para iniciar a polimeriza\u00e7\u00e3o, resultando em uma cura profunda inadequada. Casos leves podem apresentar ades\u00e3o reduzida, enquanto casos graves podem causar enrugamento da superf\u00edcie, comprometendo a apar\u00eancia do filme de tinta e suas propriedades f\u00edsicas e qu\u00edmicas.<\/li>\n<li>No espectro de UV, os comprimentos de onda mais longos apresentam capacidades de penetra\u00e7\u00e3o superiores, permitindo que alcancem camadas mais profundas do filme de revestimento com mais efic\u00e1cia. Por outro lado, os comprimentos de onda mais curtos t\u00eam dificuldade para penetrar nessas profundidades. Consequentemente, sem fotoiniciadores de onda longa para absorver a energia desses comprimentos de onda mais longos nas camadas mais profundas, o in\u00edcio da polimeriza\u00e7\u00e3o se torna um desafio. Portanto, os fotoiniciadores de penetra\u00e7\u00e3o profunda s\u00e3o indispens\u00e1veis em sistemas pigmentados. Com rela\u00e7\u00e3o \u00e0 Tabela 1, a combina\u00e7\u00e3o de fotoiniciadores de onda longa, como o TPO\/819\/651, com fotoiniciadores de onda curta, como o 184\/1173, produz resultados favor\u00e1veis.<\/li>\n<\/ul>\n<p><strong><b>Estudo de caso:<\/b><\/strong><\/p>\n<p>Em sistemas de cores UV de camada \u00fanica, as formula\u00e7\u00f5es pretas geralmente apresentam ader\u00eancia ruim e falha na ader\u00eancia de manchas cruzadas. A adi\u00e7\u00e3o de 1,5% 819 \u00e0 formula\u00e7\u00e3o melhorou significativamente a ades\u00e3o do filme, demonstrando o papel do 819 na promo\u00e7\u00e3o da cura profunda.<\/p>\n<p>Al\u00e9m disso, em sistemas preto e branco, as combina\u00e7\u00f5es 907\/ITX + 184 e 369\/ITX + 184 apresentaram resultados excelentes.<\/p>\n<p><strong><b>Sele\u00e7\u00e3o de fotoiniciadores para sistemas com requisitos de amarelamento<\/b><\/strong><\/p>\n<p>Em determinados vernizes e sistemas brancos, a resist\u00eancia ao amarelamento \u00e9 um indicador essencial para avaliar o desempenho do filme de revestimento. Al\u00e9m de selecionar resinas e mon\u00f4meros com excelente resist\u00eancia ao amarelamento, a tend\u00eancia de amarelamento dos fotoiniciadores tamb\u00e9m deve ser minimizada. Os iniciadores de fotopolimeriza\u00e7\u00e3o que cont\u00eam substituintes como N-dimetilamino em suas estruturas conjugadas geralmente apresentam tend\u00eancias mais altas de amarelamento induzido por irradia\u00e7\u00e3o. Da mesma forma, a presen\u00e7a de tais substituintes em estruturas de amina reativa tamb\u00e9m exacerba o amarelamento.<\/p>\n<p>A Tabela 2 apresenta os \u00edndices de amarelamento de v\u00e1rios iniciadores de fotopolimeriza\u00e7\u00e3o, usando triacrilato de pentaeritritol com \u00f3xido de propila como material de base e sem nenhum iniciador como refer\u00eancia em branco.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-8848\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1.webp\" alt=\"\" width=\"1920\" height=\"1729\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1.webp 1920w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1-768x692.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1-1536x1383.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1-13x12.webp 13w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1-800x720.webp 800w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1-600x540.webp 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><br \/>\nConforme mostrado na tabela acima, 184, 1173, 754 e MBF s\u00e3o todos fotoiniciadores com amarelamento m\u00ednimo, o que os torna a escolha ideal para formula\u00e7\u00f5es de verniz e sistemas brancos.<\/p>\n<p><strong><b>Boa solubilidade em diluentes ativos e olig\u00f4meros<\/b><\/strong><\/p>\n<p>A excelente solubilidade \u00e9 um pr\u00e9-requisito essencial para a incorpora\u00e7\u00e3o de fotoiniciadores em sistemas; a compatibilidade superior garante maior estabilidade da formula\u00e7\u00e3o.<\/p>\n<p>A tabela a seguir mostra a solubilidade de fotoiniciadores selecionados em solventes e mon\u00f4meros comuns.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-8846\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/3.webp\" alt=\"\" width=\"1920\" height=\"1018\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/3.webp 1920w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/3-768x407.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/3-1536x814.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/3-18x10.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/3-1280x679.webp 1280w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/3-600x318.webp 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><br \/>\nNos \u00faltimos anos, os revestimentos \u00e0 base de \u00e1gua t\u00eam se tornado cada vez mais predominantes, com os revestimentos UV \u00e0 base de \u00e1gua tamb\u00e9m ganhando aten\u00e7\u00e3o significativa. Atualmente, s\u00e3o poucos os produtos com alta solubilidade em \u00e1gua no mercado. As op\u00e7\u00f5es dispon\u00edveis comercialmente incluem: KIPEM, 819DW, BTC, BPQ, QTX, etc. O 2959 atinge uma solubilidade em \u00e1gua de 1,7% e tamb\u00e9m pode ser usado em produtos UV \u00e0 base de \u00e1gua.<\/p>\n<p><strong><b>Outras propriedades<\/b><\/strong><\/p>\n<p>Ao selecionar os fotoiniciadores, priorize aqueles com baixo odor, baixa toxicidade, boa estabilidade t\u00e9rmica e volatilidade ou migra\u00e7\u00e3o m\u00ednimas. Certifique-se de que os componentes do fotoiniciador selecionados estejam em conformidade com as leis e os regulamentos locais.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Conclus\u00e3o<\/strong><\/p>\n<p><strong><b>Em resumo, a sele\u00e7\u00e3o de fotoiniciadores n\u00e3o \u00e9 uma tarefa isolada, mas deve ser coordenada com todo o sistema e at\u00e9 mesmo com o processo de aplica\u00e7\u00e3o. \u00c9 necess\u00e1rio considerar de forma abrangente a fonte de luz, outros componentes do sistema e os requisitos de desempenho do produto fotopolimerizado para escolher um fotoiniciador que seja econ\u00f4mico e altamente eficaz.<\/b><\/strong><\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Overview of Photoinitiators &#8211; In light-curing products, photoinitiators serve as a critical component. They are substances capable of absorbing radiant energy and undergoing chemical reactions to generate reactive intermediates (free radicals or cations) with&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8845","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Guidelines for Selecting Photoinitiators in UV Coating Formulations<\/title>\n<meta name=\"description\" content=\"The effectiveness of photoinitiators in triggering polymerization reactions within light-curable products, ultimately achieving the desired performance, depends on the harmonious coordination between the photoinitiation system, irradiation conditions, and product components. Therefore, selecting appropriate photoinitiators based on specific production processes and product formulations is particularly crucial.The following sections will detail photoinitiator screening methods by combining their properties with specific case studies.Matching the absorption spectrum of photoinitiators with the emission spectrum of light sourcesCommon light sources on the market include mercury lamps, LED lamps, induction lamps, and metal halide lamps. Among these, mercury lamps are the most widely used, emitting a spectrum ranging from 200-450nm and serving as a universal type. LED lamps find extensive application in low-energy curing projects, with emission wavelengths concentrated at 365\/375\/385\/395\/405nm.When selecting a photoinitiator, choose one with significant absorption in the light source&#039;s emission spectrum.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/changhongchemical.com\/pt\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Guidelines for Selecting Photoinitiators in UV Coating Formulations\" \/>\n<meta property=\"og:description\" content=\"The effectiveness of photoinitiators in triggering polymerization reactions within light-curable products, ultimately achieving the desired performance, depends on the harmonious coordination between the photoinitiation system, irradiation conditions, and product components. Therefore, selecting appropriate photoinitiators based on specific production processes and product formulations is particularly crucial.The following sections will detail photoinitiator screening methods by combining their properties with specific case studies.Matching the absorption spectrum of photoinitiators with the emission spectrum of light sourcesCommon light sources on the market include mercury lamps, LED lamps, induction lamps, and metal halide lamps. Among these, mercury lamps are the most widely used, emitting a spectrum ranging from 200-450nm and serving as a universal type. LED lamps find extensive application in low-energy curing projects, with emission wavelengths concentrated at 365\/375\/385\/395\/405nm.When selecting a photoinitiator, choose one with significant absorption in the light source&#039;s emission spectrum.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/changhongchemical.com\/pt\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\/\" \/>\n<meta property=\"og:site_name\" content=\"Changhong Chemical\" \/>\n<meta property=\"article:published_time\" content=\"2025-09-08T10:04:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-27T11:16:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1325\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Changhong Chemical\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Changhong Chemical\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/\"},\"author\":{\"name\":\"Changhong Chemical\",\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/#\\\/schema\\\/person\\\/2a9593ff69d6db8f8ca0567ca3ed6b5d\"},\"headline\":\"Guidelines for Selecting Photoinitiators in UV Coating Formulations\",\"datePublished\":\"2025-09-08T10:04:24+00:00\",\"dateModified\":\"2026-04-27T11:16:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/\"},\"wordCount\":937,\"publisher\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/changhongchemical.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/1-1.webp\",\"articleSection\":[\"Uncategorized\"],\"inLanguage\":\"pt-BR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/\",\"url\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/\",\"name\":\"Guidelines for Selecting Photoinitiators in UV Coating Formulations\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/guidelines-for-selecting-photoinitiators-in-uv-coating-formulations\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/changhongchemical.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/1-1.webp\",\"datePublished\":\"2025-09-08T10:04:24+00:00\",\"dateModified\":\"2026-04-27T11:16:01+00:00\",\"description\":\"The effectiveness of photoinitiators in triggering polymerization reactions within light-curable products, ultimately achieving the desired performance, depends on the harmonious coordination between the photoinitiation system, irradiation conditions, and product components. Therefore, selecting appropriate photoinitiators based on specific production processes and product formulations is particularly crucial.The following sections will detail photoinitiator screening methods by combining their properties with specific case studies.Matching the absorption spectrum of photoinitiators with the emission spectrum of light sourcesCommon light sources on the market include mercury lamps, LED lamps, induction lamps, and metal halide lamps. Among these, mercury lamps are the most widely used, emitting a spectrum ranging from 200-450nm and serving as a universal type. 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