{"id":5021,"date":"2022-01-26T14:39:05","date_gmt":"2022-01-26T14:39:05","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5021"},"modified":"2026-04-28T10:41:55","modified_gmt":"2026-04-28T10:41:55","slug":"process-and-advantages-of-uv-curing-powders","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/process-and-advantages-of-uv-curing-powders\/","title":{"rendered":"Processo e vantagens dos p\u00f3s de cura UV"},"content":{"rendered":"<h1><strong>Processo e vantagens dos p\u00f3s de cura UV<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Resposta r\u00e1pida:<\/strong> A escolha do fotoiniciador geralmente \u00e9 determinada pela compatibilidade com a l\u00e2mpada, profundidade de cura, amarelamento e se o filme final ainda apresenta bom desempenho no substrato real. A melhor op\u00e7\u00e3o raramente \u00e9 a mais barata de um \u00fanico componente.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>O MDF \u00e9 f\u00e1cil de processar e tem uma superf\u00edcie homog\u00eanea e homog\u00eanea. A madeira natural tamb\u00e9m pode ser revestida com p\u00f3, mas o acabamento pode ser irregular. Podem ocorrer problemas de desgaseifica\u00e7\u00e3o e furos devido a altera\u00e7\u00f5es na resina e no teor de umidade da madeira natural<\/p>\n<p>A densidade, a fibra, a resina e o teor de umidade da madeira natural variam de acordo com o tipo de madeira, al\u00e9m do efeito do local onde ela \u00e9 cultivada e, mesmo que a esp\u00e9cie da \u00e1rvore seja a mesma, cada \u00e1rvore \u00e9 diferente.<\/p>\n<p>Como o processo de revestimento em p\u00f3 utiliza calor para derreter o p\u00f3, mesmo em temperaturas mais baixas e por curtos per\u00edodos de exposi\u00e7\u00e3o, o calor pode causar rea\u00e7\u00f5es incontrol\u00e1veis na madeira natural. Isso torna a obten\u00e7\u00e3o de uma superf\u00edcie uniforme particularmente problem\u00e1tica quando os revestimentos em p\u00f3 s\u00e3o aplicados \u00e0 madeira natural. O revestimento em p\u00f3 de MDF curado por UV produz uma superf\u00edcie mais consistente e visualmente mais agrad\u00e1vel.<\/p>\n<p>UV-curable powder coatings are produced by combining resins, pigments, high performance additives and photoinitiators. Photoinitiators such as <a href=\"https:\/\/longchangchemical.com\/pt\/product\/cas-270586-78-2\/\">Fotoiniciador TMO<\/a> e <a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">Fotoiniciador TPO-L<\/a> are key components because they absorb high-intensity UV light and generate and activate free radicals to crosslink the coating. Curing is the cross-linking of the entire coating at the molecular level and is an instantaneous curing stage. &#8220;As soon as the photoinitiator is exposed to UV light, crosslinking occurs and the coating cures immediately,&#8221; said Lonchak.<\/p>\n<p>Os aditivos aprimoram a superf\u00edcie do revestimento, melhorando ou ajustando propriedades espec\u00edficas - resist\u00eancia a arranh\u00f5es ou marcas, brilho e textura. Os pigmentos criam cor e opacidade.<\/p>\n<p>Os revestimentos em p\u00f3 curados por UV s\u00e3o produzidos da mesma forma que os revestimentos em p\u00f3 termofixos, usando o mesmo tipo de equipamento - os processos incluem mistura, extrus\u00e3o, resfriamento, corte, moagem, classifica\u00e7\u00e3o, peneira\u00e7\u00e3o e embalagem.<\/p>\n<p>Para obter um bom efeito de cura, \u00e9 necess\u00e1rio combinar o tipo e a quantidade de fotoiniciador com a fonte de luz UV, incluindo a combina\u00e7\u00e3o adequada de dose de energia UV, intensidade e comprimento de onda.<\/p>\n<p>H\u00e1 v\u00e1rios tipos de l\u00e2mpadas UV de vapor de merc\u00fario de m\u00e9dia press\u00e3o dispon\u00edveis para a cura UV de revestimentos em p\u00f3. As l\u00e2mpadas de merc\u00fario (l\u00e2mpadas \"H\") fornecem energia UV de comprimento de onda curto (220-320nm) e s\u00e3o adequadas para aplica\u00e7\u00f5es de verniz e revestimento transparente. As l\u00e2mpadas de merc\u00fario dopadas com ferro (l\u00e2mpadas \"D\") fornecem energia em alguns comprimentos de onda mais longos (320-400 nm) para auxiliar na cura de sistemas com baixo teor de pigmento. As l\u00e2mpadas de merc\u00fario dopadas com g\u00e1lio (l\u00e2mpadas \"V\") t\u00eam uma forte sa\u00edda de energia em comprimentos de onda longos (405-440 nm) e s\u00e3o dispositivos de cura de grande porte para sistemas com alto teor de pigmento. A energia de comprimento de onda longo penetra em revestimentos mais espessos, bem como em revestimentos em p\u00f3 curados por UV de sistemas pigmentados.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-5022\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-650x433.jpg\" alt=\"\" width=\"650\" height=\"433\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-650x433.jpg 650w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-325x217.jpg 325w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-300x200.jpg 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-500x333.jpg 500w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-750x500.jpg 750w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-1000x667.jpg 1000w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-1500x1000.jpg 1500w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><\/p>\n<p>As pe\u00e7as iniciais de MDF s\u00e3o curadas por UV durante a pintura a p\u00f3<\/p>\n<p>O fluxo de processo dos revestimentos em p\u00f3 cur\u00e1veis por UV \u00e9 r\u00e1pido. \"\u00c9 um processo de etapa \u00fanica de 20 minutos que transforma uma pe\u00e7a inicial de MDF em uma pe\u00e7a acabada, que est\u00e1 pronta para ser embalada e enviada\", explica Loncic.<\/p>\n<p>Primeiro, a pe\u00e7a de trabalho \u00e9 pendurada na linha de produ\u00e7\u00e3o, e as part\u00edculas de poeira remanescentes no processo s\u00e3o removidas por meio de pulveriza\u00e7\u00e3o de ar comprimido. Normalmente, o lixamento da superf\u00edcie n\u00e3o \u00e9 mais necess\u00e1rio antes do revestimento em p\u00f3. Em seguida, a pe\u00e7a de MDF entra em um forno pr\u00e9-aquecido de baixa temperatura por um minuto. \"Isso ventila a chapa antes da pintura e leva a umidade do MDF para a superf\u00edcie, tornando a chapa condutora para manter o revestimento em p\u00f3\", acrescenta Loncic.<\/p>\n<p>Em seguida, o revestimento em p\u00f3 cur\u00e1vel por UV \u00e9 aplicado eletrostaticamente usando um sistema autom\u00e1tico de pistola de pulveriza\u00e7\u00e3o. O p\u00f3 \u00e9 ent\u00e3o derretido ou gelificado em um forno de baixa temperatura por mais um minuto. Depois de derretida, a pe\u00e7a de trabalho se solidifica imediatamente sob a luz UV. Em menos de 20 minutos, a pe\u00e7a est\u00e1 completamente usinada e pronta para ser embalada e enviada ao cliente.<\/p>\n<p>Os revestimentos em p\u00f3 cur\u00e1veis por UV foram desenvolvidos h\u00e1 mais de 20 anos como uma alternativa aos revestimentos em p\u00f3 cur\u00e1veis por calor. A cura t\u00e9rmica requer altas temperaturas (cerca de 400\u00b0F\/204\u00b0C) e leva de 10 a 30 minutos ou mais para ser conclu\u00edda. O tempo de processamento \u00e9 maior e \u00e9 necess\u00e1rio um tempo de resfriamento adicional antes do processamento na pr\u00f3xima etapa.<\/p>\n<p>Como aponta Lonchak, as principais vantagens da cura por UV em rela\u00e7\u00e3o \u00e0 cura t\u00e9rmica s\u00e3o em termos de tempo e temperatura. O processo de revestimento eletrost\u00e1tico em p\u00f3 para revestimentos em p\u00f3 curados por UV e revestimentos em p\u00f3 curados termicamente \u00e9 exatamente o mesmo; no entanto, os processos de fus\u00e3o\/fluxo e cura s\u00e3o caracter\u00edsticas diferentes importantes que diferenciam funcionalmente os dois.<\/p>\n<p>O processo de cura por UV \u00e9 instant\u00e2neo. \u00c9 necess\u00e1rio apenas um breve aquecimento de um minuto a 104-116\u00b0C (220-240\u00b0F) para derreter\/nivelar o revestimento em p\u00f3 antes da cura por UV. Isso tem a vantagem de reduzir significativamente o tempo do processo e diminuir a temperatura geral, tornando o processo de revestimento em p\u00f3 cur\u00e1vel por UV muito importante na fabrica\u00e7\u00e3o de MDF. \"O calor e o tempo de exposi\u00e7\u00e3o excessivos podem causar rachaduras e outros defeitos na chapa\", observou Lonczak.<\/p>\n<p>Os revestimentos em p\u00f3 apresentam alguns desafios, mas a DVUV dominou as medidas e os meios para super\u00e1-los. As varia\u00e7\u00f5es de umidade e temperatura podem afetar o sucesso de um processo, mas isso \u00e9 facilmente resolvido pelo controle operacional do processo em uma f\u00e1brica com temperatura regulada. Um umidificador garante que a placa de MDF mantenha o n\u00edvel correto de umidade antes da aplica\u00e7\u00e3o do revestimento em p\u00f3.<\/p>\n<p>A configura\u00e7\u00e3o e o teste de par\u00e2metros da DVUV na primeira execu\u00e7\u00e3o tamb\u00e9m garantem a produ\u00e7\u00e3o de produtos est\u00e1veis e consistentes. A opera\u00e7\u00e3o de cada link da DVUV \u00e9 personalizada de acordo com os requisitos de par\u00e2metros do cliente para a pe\u00e7a de trabalho. \"A velocidade da linha, a dist\u00e2ncia da pistola e a temperatura do processo s\u00e3o diferentes e corrigidas para cada projeto que executamos\", conclui Loncic.<\/p>\n<p>Al\u00e9m da verifica\u00e7\u00e3o durante a execu\u00e7\u00e3o para garantir a qualidade, a equipe de produ\u00e7\u00e3o tamb\u00e9m definiu as etapas de comissionamento ao mesmo tempo. Controle de qualidade das pe\u00e7as acabadas, incluindo uma s\u00e9rie de testes destrutivos e n\u00e3o destrutivos:<\/p>\n<p>Inspe\u00e7\u00e3o visual das superf\u00edcies da pe\u00e7a de trabalho em compara\u00e7\u00e3o com as pe\u00e7as padr\u00e3o<\/p>\n<p>Teste de medidor de espessura de torque (medir a espessura do revestimento)<\/p>\n<p>leitura brilhante<\/p>\n<p>Teste de resist\u00eancia ao solvente MEK<\/p>\n<p>\"Nossas equipes de produ\u00e7\u00e3o tamb\u00e9m t\u00eam manuten\u00e7\u00e3o preventiva, an\u00e1lise de rastreabilidade e planos de a\u00e7\u00e3o corretiva quando surgem problemas de qualidade ou de m\u00e3o de obra.\"<\/p>\n<p>O futuro \u00e9 promissor para o MDF com revestimento em p\u00f3 da DVUV. Os governos e os \u00f3rg\u00e3os reguladores est\u00e3o restringindo ou eliminando o uso de tintas l\u00edquidas \u00e0 base de solventes.<\/p>\n<p>Os revestimentos l\u00edquidos \u00e0 base de \u00e1gua s\u00e3o dif\u00edceis de usar no MDF, o que torna os revestimentos em p\u00f3 cur\u00e1veis por UV uma solu\u00e7\u00e3o de processamento ideal para o MDF.<\/p>\n<p>Os revestimentos em p\u00f3 com cura por UV s\u00e3o isentos de solventes, n\u00e3o t\u00f3xicos e n\u00e3o cont\u00eam compostos org\u00e2nicos vol\u00e1teis (VOCs) nem poluentes atmosf\u00e9ricos nocivos. As opera\u00e7\u00f5es de produ\u00e7\u00e3o n\u00e3o requerem permiss\u00e3o especial.<\/p>\n<p>&nbsp;<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>Uma rota de sele\u00e7\u00e3o pr\u00e1tica para projetos relacionados a fotoiniciadores<\/h2>\n<p>Ao avaliar fotoiniciadores, os compradores t\u00e9cnicos ou formuladores geralmente consideram a qualidade da cura e a adequa\u00e7\u00e3o \u00e0 aplica\u00e7\u00e3o: qual embalagem cura de forma confi\u00e1vel, mant\u00e9m uma apar\u00eancia aceit\u00e1vel e ainda funciona sob as condi\u00e7\u00f5es da l\u00e2mpada, espessura do filme e substrato do processo real.<\/p>\n<ul>\n<li><strong>Primeiro, compare a embalagem com a l\u00e2mpada:<\/strong> L\u00e2mpadas de merc\u00fario, LEDs UV e sistemas de luz vis\u00edvel podem classificar os mesmos fotoiniciadores de maneiras muito diferentes.<\/li>\n<li><strong>Verifique a cura em profundidade e a cura superficial separadamente:<\/strong> Uma pel\u00edcula que parece seca na superf\u00edcie ainda pode estar fr\u00e1gil por baixo.<\/li>\n<li><strong>Equilibre o amarelamento com a reatividade:<\/strong> O m\u00e9todo de cura profunda mais eficaz nem sempre \u00e9 a melhor op\u00e7\u00e3o comercial se o risco de migra\u00e7\u00e3o ou altera\u00e7\u00e3o da cor se tornar inaceit\u00e1vel.<\/li>\n<li><strong>Utilize a f\u00f3rmula final como refer\u00eancia:<\/strong> A quantidade de pigmento, o pacote de mon\u00f4meros e a espessura do filme podem alterar a classifica\u00e7\u00e3o aparente do mesmo iniciador.<\/li>\n<\/ul>\n<h3>Refer\u00eancias de produtos recomendadas<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">CHLUMINIT TPO-L<\/a>:<\/strong> Uma excelente refer\u00eancia de baixo amarelamento para sistemas UV orientados a LEDs.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">CHLUMINIT 819<\/a>:<\/strong> \u00datil quando uma f\u00f3rmula necessita de maior absor\u00e7\u00e3o e suporte \u00e0 cura mais profunda.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-184-cas-947-19-3\/\">CHLUMINIT 184<\/a>:<\/strong> Um padr\u00e3o cl\u00e1ssico de radicais livres para cura r\u00e1pida de superf\u00edcies em muitos sistemas UV.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/cas-270586-78-2\/\">CHLUMINIT TMO<\/a>:<\/strong> Um ponto de compara\u00e7\u00e3o valioso quando se trata de menor amarelamento ou discuss\u00f5es sobre a substitui\u00e7\u00e3o do TPO.<\/li>\n<\/ul>\n<h3>FAQ para compradores e formuladores<\/h3>\n<p><strong>Por que os pacotes de fotoiniciadores misturados s\u00e3o t\u00e3o comuns?<\/strong><br \/>Como um produto pode controlar o amarelamento ou o encaixe da l\u00e2mpada, enquanto outro melhora a profundidade de cura ou o desempenho da velocidade da linha, o pacote completo costuma ser mais eficaz do que qualquer produto individual.<\/p>\n<p><strong>A cura incompleta deve sempre ser resolvida adicionando mais iniciador?<\/strong><br \/>N\u00e3o automaticamente. A verdadeira limita\u00e7\u00e3o pode estar na l\u00e2mpada, na espessura do filme, na tonalidade do pigmento ou no restante do sistema reativo, e n\u00e3o simplesmente em uma subdosagem.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>MDF is easy to process and has a homogeneous and homogeneous surface. Natural wood can also be powder coated, but the finish may be uneven. Problems with outgassing and pinholes<\/p>","protected":false},"author":1,"featured_media":5022,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-5021","post","type-post","status-publish","format-standard","has-post-thumbnail","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>Process and Advantages of UV Curing Powders - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"MDF is easy to process and has a homogeneous and homogeneous surface. Natural wood can also be powder coated, but the finish may be uneven. 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