{"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\/fr\/how-to-inhibit-oxygen-blocking\/","title":{"rendered":"Comment inhiber le blocage de l'oxyg\u00e8ne ?"},"content":{"rendered":"<h1><strong>Comment inhiber le blocage de l'oxyg\u00e8ne ?<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>R\u00e9ponse rapide :<\/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>Le blocage de l'oxyg\u00e8ne est \u00e9galement appel\u00e9 inhibition de l'oxyg\u00e8ne. En raison de la forte concentration d'oxyg\u00e8ne dans la couche de surface, l'inhibition de l'oxyg\u00e8ne entra\u00eene le durcissement de la couche inf\u00e9rieure, mais la surface n'est toujours pas durcie, reste collante et n'est pas s\u00e8che. L'inhibition de l'oxyg\u00e8ne prolonge non seulement le temps de durcissement, mais peut \u00e9galement affecter les performances de la couche de surface durcie, telles que la duret\u00e9, la r\u00e9sistance \u00e0 l'abrasion, la r\u00e9sistance aux rayures, etc. La r\u00e9action de durcissement de presque tous les photo-initiateurs conventionnels est affect\u00e9e par l'oxyg\u00e8ne.<br \/>\nPour r\u00e9soudre le probl\u00e8me de l'agr\u00e9gation bloqu\u00e9e par l'oxyg\u00e8ne, il faut principalement tenir compte du m\u00e9canisme de r\u00e9action, de la vitesse de r\u00e9action et du processus de durcissement pour modifier trois aspects.<br \/>\n1. modifier le m\u00e9canisme de r\u00e9action : am\u00e9liorer le syst\u00e8me photo-initiateur pour supprimer le ph\u00e9nom\u00e8ne d'agr\u00e9gation du blocage de l'oxyg\u00e8ne en surface, comme la viscosit\u00e9 de la formulation : dans les formulations \u00e0 faible viscosit\u00e9, la vitesse de diffusion de l'oxyg\u00e8ne sera plus rapide, de sorte que la situation de blocage de l'oxyg\u00e8ne dans les formulations \u00e0 viscosit\u00e9 plus \u00e9lev\u00e9e sera r\u00e9duite. \u00c9tant donn\u00e9 qu'une augmentation de la temp\u00e9rature r\u00e9duit la viscosit\u00e9 du syst\u00e8me, le durcissement \u00e0 des temp\u00e9ratures plus basses entra\u00eenera moins de blocage de l'oxyg\u00e8ne.<br \/>\n2. Modifier la vitesse de r\u00e9action : augmenter la concentration de l'initiateur ou augmenter l'intensit\u00e9 de la lumi\u00e8re, car le blocage de l'oxyg\u00e8ne est d\u00fb \u00e0 la r\u00e9action entre l'oxyg\u00e8ne et les radicaux libres ; une concentration \u00e9lev\u00e9e de photo-initiateur peut donc g\u00e9n\u00e9rer davantage de radicaux libres, ce qui emp\u00eache la consommation d'oxyg\u00e8ne et la diffusion de l'oxyg\u00e8ne dans le rev\u00eatement, et permet finalement d'obtenir l'effet de surmonter le blocage de l'oxyg\u00e8ne. Bien entendu, le taux de g\u00e9n\u00e9ration de radicaux libres et le type de photo-initiateur ont \u00e9galement un rapport important ; vous pouvez choisir une r\u00e9sine de durcissement modifi\u00e9e, puis ajouter des monom\u00e8res ou des groupes consommateurs d'oxyg\u00e8ne ; l'ajout d'un ou de plusieurs pi\u00e9geurs d'oxyg\u00e8ne au syst\u00e8me de durcissement \u00e0 la lumi\u00e8re peut att\u00e9nuer l'effet de blocage de l'oxyg\u00e8ne.<br \/>\n3. sensibilisateur de colorant : En pr\u00e9sence de certains sensibilisateurs de pigments (tels que le 1,3-diph\u00e9nylisobenzofurane), des produits \u00e0 fonction photo-initiatrice (tels que le 1,2-dibenzoylbenz\u00e8ne) peuvent \u00eatre produits, att\u00e9nuant ainsi le r\u00f4le du blocage de l'oxyg\u00e8ne. Toutefois, cette m\u00e9thode apporte une certaine coloration \u00e0 la formulation, de sorte que son utilisation est limit\u00e9e.<br \/>\n4. Modifier le processus de durcissement : m\u00e9thode de protection par gaz inerte ; m\u00e9thode de la cire flottante ; m\u00e9thode de stratification ; m\u00e9thode d'irradiation par lumi\u00e8re forte ; m\u00e9thode d'irradiation pas \u00e0 pas.<br \/>\nMais les diff\u00e9rentes m\u00e9thodes d'adaptation ont leurs avantages et leurs inconv\u00e9nients.<\/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\u00e9thode<\/td>\n<td class=\"et3\" style=\"width: 207.00pt;\" width=\"276\">Avantages<\/td>\n<td class=\"et3\" style=\"width: 222.00pt;\" width=\"296\">Inconv\u00e9nients<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Protection contre les gaz inertes<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Pas d'impact n\u00e9gatif sur la performance du produit<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Co\u00fbteux ; difficile \u00e0 mettre en \u0153uvre<\/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\u00e9thode de la cire flottante<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Peu co\u00fbteux<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Affecte les performances du produit ; prend du temps pour achever la migration<\/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\u00e9thode d'enduction<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Une bonne solution lorsque la membrane fait partie du produit<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Co\u00fbt des mat\u00e9riaux et \u00e9limination des membranes<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Augmenter la concentration de l'initiateur<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Facile \u00e0 mettre en \u0153uvre<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">L'augmentation des r\u00e9sidus ou des sous-produits peut r\u00e9duire les performances du produit.<\/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\u00e9thode d'irradiation par lumi\u00e8re intense<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Pas d'impact n\u00e9gatif sur le produit<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Augmentation des co\u00fbts d'\u00e9quipement<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Thiol<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Am\u00e9liore la r\u00e9sistance \u00e0 la chaleur ; r\u00e9duit l'absorption d'eau ; am\u00e9liore l'adh\u00e9rence<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Odeur d\u00e9sagr\u00e9able<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Amines<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Peu co\u00fbteux ; peut am\u00e9liorer l'adh\u00e9rence<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">Probl\u00e8mes de jaunissement apr\u00e8s durcissement ; sensible \u00e0 l'humidit\u00e9<\/td>\n<\/tr>\n<tr style=\"height: 26.25pt;\">\n<td class=\"et4\" style=\"height: 26.25pt; width: 114.75pt;\" width=\"153\" height=\"35\">Ether<\/td>\n<td class=\"et5\" style=\"width: 207.00pt;\" width=\"276\">Peut \u00eatre utilis\u00e9 en grandes quantit\u00e9s<\/td>\n<td class=\"et5\" style=\"width: 222.00pt;\" width=\"296\">R\u00e9sistance r\u00e9duite \u00e0 la temp\u00e9rature ; peut r\u00e9duire la r\u00e9sistance \u00e0 l'eau<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- lc-commercial-start --><\/p>\n<h2>Un itin\u00e9raire de s\u00e9lection pratique pour les projets li\u00e9s aux photoinitiateurs<\/h2>\n<p>Lorsque les acheteurs techniques ou les formulateurs \u00e9valuent des photoinitiateurs, le cadre de d\u00e9cision le plus utile concerne g\u00e9n\u00e9ralement la qualit\u00e9 de la polym\u00e9risation associ\u00e9e \u00e0 l'ad\u00e9quation \u00e0 l'application : quel paquet polym\u00e9rise de mani\u00e8re fiable, maintient une apparence acceptable et fonctionne toujours sous la lampe, l'\u00e9paisseur du film et les conditions du substrat du processus r\u00e9el.<\/p>\n<ul>\n<li><strong>Associez d'abord le paquet \u00e0 la lampe :<\/strong> Les lampes \u00e0 mercure, les LED UV et les syst\u00e8mes de lumi\u00e8re visible peuvent classer de la m\u00eame mani\u00e8re des photoinitiateurs tr\u00e8s diff\u00e9rents.<\/li>\n<li><strong>V\u00e9rifier la polym\u00e9risation en profondeur et la polym\u00e9risation de surface s\u00e9par\u00e9ment :<\/strong> un film sec en apparence peut \u00eatre faible en dessous.<\/li>\n<li><strong>\u00c9quilibrer le jaunissement avec la r\u00e9activit\u00e9 :<\/strong> La voie de polym\u00e9risation profonde la plus forte n'est pas toujours le meilleur choix commercial si la couleur ou le risque de migration deviennent inacceptables.<\/li>\n<li><strong>Utilisez la formule finale comme r\u00e9f\u00e9rence\u00a0:<\/strong> La charge de pigment, le paquet de monom\u00e8re et l'\u00e9paisseur du film peuvent tous modifier le classement apparent du m\u00eame initiateur.<\/li>\n<\/ul>\n<h3>R\u00e9f\u00e9rences de produits recommand\u00e9es<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">CHLUMINIT TPO-L<\/a>:<\/strong> Une r\u00e9f\u00e9rence solide \u00e0 faible jaunissement pour les syst\u00e8mes UV orient\u00e9s LED.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">CHLUMINIT 819<\/a>:<\/strong> Utile lorsqu'une formulation n\u00e9cessite une absorption plus forte et un soutien \u00e0 une cure plus profonde.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/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 pour les acheteurs et les formulateurs<\/h3>\n<p><strong>Pourquoi les m\u00e9langes de photoinitiateurs sont-ils si courants ?<\/strong><br \/>Parce qu'un produit peut contr\u00f4ler le jaunissement ou bien s'adapter \u00e0 la lampe, tandis qu'un autre am\u00e9liore la profondeur de durcissement ou les performances en vitesse de ligne, l'ensemble complet est souvent plus performant que n'importe quel grade individuel.<\/p>\n<p><strong>Une polym\u00e9risation incompl\u00e8te doit-elle toujours \u00eatre r\u00e9solue en ajoutant plus d'initiateur ?<\/strong><br \/>Pas automatiquement. La limitation r\u00e9elle peut \u00eatre la lampe, l'\u00e9paisseur du film, la teinte du pigment, ou le reste du syst\u00e8me r\u00e9actif plut\u00f4t qu'un simple sous-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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