{"id":5698,"date":"2022-10-30T05:41:37","date_gmt":"2022-10-30T05:41:37","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5698"},"modified":"2026-04-28T10:42:10","modified_gmt":"2026-04-28T10:42:10","slug":"how-to-inhibit-oxygen-blocking","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/how-to-inhibit-oxygen-blocking\/","title":{"rendered":"Como inibir o bloqueio de oxig\u00eanio?"},"content":{"rendered":"<h1><strong>Como inibir o bloqueio de oxig\u00eanio?<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> For practical formulation work, photoinitiator screening starts with the light source and film build, then checks yellowing, adhesion, and cure completeness under real production conditions.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>O bloqueio de oxig\u00eanio tamb\u00e9m \u00e9 chamado de inibi\u00e7\u00e3o de oxig\u00eanio. Devido \u00e0 alta concentra\u00e7\u00e3o de oxig\u00eanio na camada superficial, a inibi\u00e7\u00e3o de oxig\u00eanio far\u00e1 com que a camada inferior tenha sido curada, mas a superf\u00edcie ainda n\u00e3o esteja curada, pegajosa e n\u00e3o seca. A inibi\u00e7\u00e3o de oxig\u00eanio n\u00e3o apenas prolonga o tempo de cura, mas tamb\u00e9m pode afetar o desempenho da camada superficial curada, como dureza, resist\u00eancia \u00e0 abras\u00e3o, resist\u00eancia a arranh\u00f5es etc. A rea\u00e7\u00e3o de cura de quase todos os materiais fotoiniciadores convencionais \u00e9 afetada pelo oxig\u00eanio.<br \/>\nPara solucionar o problema da agrega\u00e7\u00e3o bloqueada por oxig\u00eanio, \u00e9 necess\u00e1rio, principalmente, que o mecanismo de rea\u00e7\u00e3o, a taxa de rea\u00e7\u00e3o e o processo de cura alterem tr\u00eas aspectos.<br \/>\n1. alterar o mecanismo de rea\u00e7\u00e3o: melhorar o sistema fotoiniciador para suprimir o fen\u00f4meno da agrega\u00e7\u00e3o de bloqueio de oxig\u00eanio na superf\u00edcie, como a viscosidade da formula\u00e7\u00e3o: nas formula\u00e7\u00f5es de menor viscosidade, a taxa de difus\u00e3o de oxig\u00eanio ser\u00e1 mais r\u00e1pida, de modo que a situa\u00e7\u00e3o de bloqueio de oxig\u00eanio das formula\u00e7\u00f5es de maior viscosidade ser\u00e1 reduzida. Como o aumento da temperatura reduz a viscosidade do sistema, a cura em temperaturas mais baixas resultar\u00e1 em menos bloqueio de oxig\u00eanio.<br \/>\n2. Altere a taxa de rea\u00e7\u00e3o: aumente a concentra\u00e7\u00e3o do iniciador ou aumente a intensidade da luz, pois o bloqueio de oxig\u00eanio se deve \u00e0 rea\u00e7\u00e3o entre o oxig\u00eanio e os radicais livres, ent\u00e3o uma alta concentra\u00e7\u00e3o de fotoiniciador pode gerar mais radicais livres, o que evita o consumo de oxig\u00eanio e impede a difus\u00e3o de oxig\u00eanio para o revestimento e, por fim, alcan\u00e7a o efeito de superar o bloqueio de oxig\u00eanio. Obviamente, a taxa de gera\u00e7\u00e3o de radicais livres e o tipo de fotoiniciador tamb\u00e9m t\u00eam uma grande rela\u00e7\u00e3o; \u00e9 poss\u00edvel escolher uma resina de cura modificada e, em seguida, adicionar mon\u00f4meros ou grupos que consomem oxig\u00eanio; a adi\u00e7\u00e3o de um ou mais absorvedores de oxig\u00eanio ao sistema de cura por luz pode aliviar o efeito de bloqueio de oxig\u00eanio<br \/>\n3. sensibilizador de corante: Na presen\u00e7a de determinados sensibilizadores de pigmento (como 1,3-difenilisobenzofurano), podem ser produzidos produtos com fun\u00e7\u00e3o fotoiniciadora (como 1,2-dibenzoilbenzeno), aliviando assim a fun\u00e7\u00e3o de bloqueio de oxig\u00eanio. No entanto, esse m\u00e9todo trar\u00e1 um pouco de cor \u00e0 formula\u00e7\u00e3o, portanto, seu uso \u00e9 limitado.<br \/>\n4. Alterar o processo de cura: m\u00e9todo de prote\u00e7\u00e3o com g\u00e1s inerte; m\u00e9todo de cera flutuante; m\u00e9todo de lamina\u00e7\u00e3o; m\u00e9todo de irradia\u00e7\u00e3o de luz forte; m\u00e9todo de irradia\u00e7\u00e3o passo a passo<br \/>\nMas diferentes m\u00e9todos de enfrentamento t\u00eam seus pr\u00f3s e contras.<\/p>\n<table style=\"border-collapse: collapse; width: 543.77pt;\" border=\"0\" width=\"725\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr style=\"height: 14.25pt;\">\n<td class=\"et2\" style=\"height: 14.25pt; width: 114.75pt;\" width=\"153\" height=\"19\">M\u00e9todo<\/td>\n<td class=\"et3\" style=\"width: 207.00pt;\" width=\"276\">Vantagens<\/td>\n<td class=\"et3\" style=\"width: 222.00pt;\" width=\"296\">Desvantagens<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Prote\u00e7\u00e3o contra g\u00e1s inerte<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Nenhum impacto negativo no desempenho do produto<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Caro; dif\u00edcil de implementar<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">M\u00e9todo da cera flutuante<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Barato<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Afeta o desempenho do produto; leva tempo para concluir a migra\u00e7\u00e3o<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">M\u00e9todo de revestimento<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Uma boa solu\u00e7\u00e3o quando a membrana faz parte do produto<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Custo do material e remo\u00e7\u00e3o da membrana<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Aumentar a concentra\u00e7\u00e3o do iniciador<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">F\u00e1cil de implementar<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">O aumento de res\u00edduos ou subprodutos pode reduzir o desempenho do produto<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">M\u00e9todo de irradia\u00e7\u00e3o de luz intensa<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Nenhum impacto negativo sobre o produto<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Aumenta os custos dos equipamentos<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Tiol<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Melhora a resist\u00eancia ao calor; reduz a absor\u00e7\u00e3o de \u00e1gua; melhora a ades\u00e3o<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Odor desagrad\u00e1vel<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Aminas<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Barato; pode melhorar a ades\u00e3o<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Problemas de amarelamento ap\u00f3s a cura; sens\u00edvel \u00e0 umidade<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">\u00c9ter<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Pode ser usado em grandes quantidades<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Resist\u00eancia reduzida \u00e0 temperatura; pode reduzir a resist\u00eancia \u00e0 \u00e1gua<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical selection route for photoinitiator-related projects<\/h2>\n<p>When technical buyers or formulators screen photoinitiators, the most useful decision frame is usually cure quality plus application fit: which package cures reliably, keeps appearance acceptable, and still works under the lamp, film thickness, and substrate conditions of the actual process.<\/p>\n<ul>\n<li><strong>Match the package to the lamp first:<\/strong> mercury lamps, UV LEDs, and visible-light systems can rank the same photoinitiators very differently.<\/li>\n<li><strong>Check depth cure and surface cure separately:<\/strong> a film that feels dry on top can still be weak underneath.<\/li>\n<li><strong>Balance yellowing with reactivity:<\/strong> the strongest deep-cure route is not always the best commercial choice if color or migration risk becomes unacceptable.<\/li>\n<li><strong>Use the final formula as the benchmark:<\/strong> pigment load, monomer package, and film thickness can all change the apparent ranking of the same initiator.<\/li>\n<\/ul>\n<h3>Recommended product references<\/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> A strong low-yellowing reference for LED-oriented UV systems.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">CHLUMINIT 819<\/a>:<\/strong> Useful when a formulation needs stronger absorption and deeper cure support.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-184-cas-947-19-3\/\">CHLUMINIT 184<\/a>:<\/strong> A classic free-radical benchmark for fast surface cure in many UV systems.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why are blended photoinitiator packages so common?<\/strong><br \/>Because one product may control yellowing or lamp fit well while another improves cure depth or line-speed performance, so the full package is often stronger than any single grade.<\/p>\n<p><strong>Should incomplete cure always be solved by adding more initiator?<\/strong><br \/>Not automatically. The real limitation may be the lamp, film thickness, pigment shading, or the rest of the reactive system rather than simple under-dosage.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>Oxygen blocking is also called oxygen inhibition. Due to the high concentration of oxygen in the surface layer, the oxygen inhibition will lead to the lower layer has been cured,<\/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-5698","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>How to inhibit oxygen blocking? - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"Oxygen blocking is also called oxygen inhibition. 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