{"id":5596,"date":"2022-09-23T08:37:38","date_gmt":"2022-09-23T08:37:38","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5596"},"modified":"2026-04-28T10:42:08","modified_gmt":"2026-04-28T10:42:08","slug":"uv-oligomers-used-in-light-curing-coatings","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/uv-oligomers-used-in-light-curing-coatings\/","title":{"rendered":"Oligom\u00e8res UV utilis\u00e9s dans les vernis photopolym\u00e9risables"},"content":{"rendered":"<h1><strong>Oligom\u00e8res UV utilis\u00e9s dans les vernis photopolym\u00e9risables<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>R\u00e9ponse rapide :<\/strong> UV monomers and oligomers are usually chosen by viscosity, adhesion, flexibility, shrinkage, and cure speed as a package. The most reliable formulas come from balancing those properties rather than maximizing only one.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>L'oligom\u00e8re utilis\u00e9 pour les rev\u00eatements photopolym\u00e9risables est \u00e9galement connu sous le nom de pr\u00e9polym\u00e8re, qui a un faible poids mol\u00e9culaire, poss\u00e8de les caract\u00e9ristiques des groupes de polym\u00e9risation, de la viscosit\u00e9, et constitue le corps principal du film des rev\u00eatements photopolym\u00e9risables. La photopolym\u00e9risation est la r\u00e9action de polym\u00e9risation entre des mol\u00e9cules insatur\u00e9es, selon le m\u00e9canisme d'initiation de l'initiateur, il existe une polym\u00e9risation radicalaire et une polym\u00e9risation cationique, la plus courante \u00e9tant la polym\u00e9risation radicalaire, cette r\u00e9action de r\u00e9ticulation par polym\u00e9risation C-C est une r\u00e9ticulation rigide. La r\u00e9action de polym\u00e9risation radicalaire est rapide, le retrait est important ; le changement de degr\u00e9 de polym\u00e9risation est faible, l'influence de la polym\u00e9risation de blocage est importante (0,01-0,1% de l'agent de blocage pour emp\u00eacher la r\u00e9action). L'\u00e9tude a r\u00e9v\u00e9l\u00e9 que la double liaison n'est pas polym\u00e9ris\u00e9e lorsque son espacement est long, une fois polym\u00e9ris\u00e9e, la g\u00e9n\u00e9ration de liaisons covalentes, l'espacement se raccourcit, ce qui entra\u00eene une r\u00e9duction du volume, toutes les polym\u00e9risations insatur\u00e9es de la double liaison subissent un r\u00e9tr\u00e9cissement allant jusqu'\u00e0 11%.<\/p>\n<p>Les formulations de rev\u00eatements photopolym\u00e9risables sont complexes et pr\u00e9sentent les performances suivantes.<\/p>\n<p>Tout d'abord, il existe de nombreux types de monom\u00e8res et de nombreux types d'oligom\u00e8res de base (r\u00e9sines). \u00c0 l'heure actuelle, selon la synth\u00e8se des groupes fonctionnels, on distingue les classes de polyester insatur\u00e9 PE, \u00e9poxy EA, polyur\u00e9thane PUA, polyester PEA, amin\u00e9, poly\u00e9ther, organosilici\u00e9, ester de phosphate, mixte, etc.<\/p>\n<p>Deuxi\u00e8mement, selon la fonction des rev\u00eatements photopolym\u00e9risables couramment utilis\u00e9s dans la r\u00e9sine, on distingue les cat\u00e9gories suivantes.<\/p>\n<p>1\u3001R\u00e9sine dure - Tg \u00e9lev\u00e9, duret\u00e9 \u00e9lev\u00e9e, bonnes propri\u00e9t\u00e9s chimiques, vitesse de durcissement la plus \u00e9lev\u00e9e. Tels que le bisph\u00e9nol A EA standard, le PUA \u00e0 groupe fonctionnel \u00e9lev\u00e9 et le 2fPUA \u00e0 faible poids mol\u00e9culaire, l'acrylate amin\u00e9 \u00e0 groupe fonctionnel \u00e9lev\u00e9, les oligom\u00e8res de m\u00e9thacrylate, etc.<\/p>\n<p>2, r\u00e9sine molle - Tg faible, bonne flexibilit\u00e9, vitesse de durcissement lente, faible densit\u00e9 de r\u00e9ticulation. Tels que l'\u00e9poxy modifi\u00e9 - l'acrylate d'huile de soja \u00e9poxy, etc. ; l'acrylate de polyester \u00e0 longue cha\u00eene ; la structure \u00e0 cha\u00eene droite avec un poids mol\u00e9culaire moyen de plus de 1200 PUA ; certains oligom\u00e8res d'acrylate pur, etc.<\/p>\n<p>3. R\u00e9sine polaire : oligom\u00e8re contenant de l'hydrog\u00e8ne actif ou facile \u00e0 former des liaisons hydrog\u00e8ne, pouvant modifier la polarit\u00e9 ou la tension superficielle. Tels que l'acrylate de phosphate, les oligom\u00e8res de silicone, les oligom\u00e8res d'acrylate de carboxyle, etc.<\/p>\n<p>4. Oligom\u00e8res UV \u00e0 base d'eau, type \u00e9mulsion courante, type dispersion dans l'eau, type soluble dans l'eau.<\/p>\n<p>5. Les r\u00e9sines non r\u00e9ticulantes utilis\u00e9es dans la formulation des rev\u00eatements photopolym\u00e9risables jouent un r\u00f4le de remplissage, am\u00e9liorent la densit\u00e9 de r\u00e9ticulation, augmentent l'adh\u00e9rence, modifient la flexibilit\u00e9, am\u00e9liorent la mouillabilit\u00e9 et jouent d'autres r\u00f4les. Ces r\u00e9sines sont g\u00e9n\u00e9ralement des r\u00e9sines alkydes \u00e0 huile longue, des r\u00e9sines acryliques thermoplastiques, des r\u00e9sines ald\u00e9hydes et c\u00e9toniques, des r\u00e9sines de p\u00e9trole, etc.<\/p>\n<p>Troisi\u00e8mement, la conception de la formule du rev\u00eatement photopolym\u00e9risable (UV) lors du choix de la r\u00e9sine.<\/p>\n<p>Avant de concevoir la formule de rev\u00eatement, il convient de pr\u00e9ciser le type de rev\u00eatement, c'est-\u00e0-dire l'appr\u00eat, la couche de finition ou la peinture color\u00e9e, et de comprendre les propri\u00e9t\u00e9s de base du mat\u00e9riau rev\u00eatu, telles que la taille de la polarit\u00e9 (tension superficielle), la pr\u00e9sence ou non de cristallisation, l'appartenance \u00e0 la cat\u00e9gorie des thermoplastiques ou des thermodurcissables, etc. La description sp\u00e9cifique est la suivante.<\/p>\n<p>1, le choix de la r\u00e9sine d'appr\u00eat. Tout d'abord, il y a l'exigence d'adh\u00e9rence, qui est la g\u00e9n\u00e9ralit\u00e9 de la r\u00e9sine d'appr\u00eat ; la mouillabilit\u00e9, qui se r\u00e9f\u00e8re au mouillage de la couleur et de la charge et au mouillage du substrat, qui sont deux exigences diff\u00e9rentes, parce que la tension de surface du substrat et de la charge de couleur ne sera pas exactement la m\u00eame ; la flexibilit\u00e9, qui implique principalement le pon\u00e7age et l'adh\u00e9rence entre les couches.<\/p>\n<p>2\u3001S\u00e9lection de la r\u00e9sine pour la couche de finition. Les performances de la couche de finition et le choix de la r\u00e9sine sont d\u00e9crits ci-dessous.<\/p>\n<p>Pl\u00e9nitude et plan\u00e9it\u00e9 du film. Pour r\u00e9pondre \u00e0 cette exigence, il est n\u00e9cessaire de choisir des r\u00e9sines et des monom\u00e8res compatibles, d'am\u00e9liorer le mouillage et le nivellement avec l'appr\u00eat, d'augmenter le degr\u00e9 de r\u00e9ticulation de mani\u00e8re appropri\u00e9e et de choisir une r\u00e9sine \u00e0 indice de r\u00e9fraction plus \u00e9lev\u00e9.<\/p>\n<p>La t\u00e9nacit\u00e9 implique principalement la duret\u00e9 et la r\u00e9sistance \u00e0 l'abrasion. Ces deux propri\u00e9t\u00e9s sont li\u00e9es, mais pas n\u00e9cessairement identiques, et doivent \u00eatre trait\u00e9es diff\u00e9remment.<\/p>\n<p>Adh\u00e9sion entre les couches. La solution de l'adh\u00e9rence entre les couches doit r\u00e9pondre aux exigences de mouillage, de nivellement et de polarit\u00e9 de la r\u00e9sine.<\/p>\n<p>EA, PUA (polyester) a une bonne r\u00e9sistance chimique, PE, poly\u00e9ther est moins bon ; g\u00e9n\u00e9ralement, PUA aliphatique, acrylate de poly\u00e9ther pur, C pur, classe amino ont une bonne r\u00e9sistance au jaunissement, la formulation de l'ajout de l'agent anti-jaunissement appropri\u00e9 peut \u00e9galement am\u00e9liorer efficacement la r\u00e9sistance au jaunissement de la couche de finition.<\/p>\n<p>Exigence de matit\u00e9. Certaines r\u00e9sines ayant un poids mol\u00e9culaire l\u00e9g\u00e8rement inf\u00e9rieur ou tr\u00e8s \u00e9lev\u00e9 auront un certain effet mat ; l'effet mat de certaines r\u00e9sines polyur\u00e9thanes est \u00e9galement bon.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>Comment les acheteurs \u00e9valuent-ils g\u00e9n\u00e9ralement les monom\u00e8res UV et les syst\u00e8mes de r\u00e9sine<\/h2>\n<p>La plupart des formulations UV les plus performantes sont construites en choisissant d'abord la r\u00e9sine de base, puis en ajustant le package de monom\u00e8res r\u00e9actifs en fonction du substrat, de la m\u00e9thode de durcissement et des contraintes d'utilisation finale. Cela produit g\u00e9n\u00e9ralement un r\u00e9sultat plus stable que de choisir les mat\u00e9riaux uniquement en fonction de la viscosit\u00e9 ou du prix.<\/p>\n<ul>\n<li><strong>Commencer \u00e0 partir de la propri\u00e9t\u00e9 cible finale :<\/strong> la duret\u00e9, la flexibilit\u00e9, l'adh\u00e9rence et le retrait indiquent rarement le m\u00eame ensemble de mati\u00e8res premi\u00e8res.<\/li>\n<li><strong>Filtrer l'ensemble du package r\u00e9actif :<\/strong> les choix d'oligom\u00e8res, de monom\u00e8res et de photoinitiateurs interagissent fortement dans les syst\u00e8mes UV.<\/li>\n<li><strong>Utilisez la viscosit\u00e9 comme un outil, pas comme la seule r\u00e8gle de d\u00e9cision :<\/strong> le mat\u00e9riau le plus facile \u00e0 travailler n'est pas toujours celui qui donne les meilleurs r\u00e9sultats apr\u00e8s durcissement.<\/li>\n<li><strong>V\u00e9rifier le substrat r\u00e9el :<\/strong> Le plastique, le m\u00e9tal, les films d&#x27;\u00e9tiquetage, les syst\u00e8mes \u00e0 base de gel et les rev\u00eatements peuvent pr\u00e9senter des \u00e9quilibres tr\u00e8s diff\u00e9rents entre polarit\u00e9 et densit\u00e9 de polym\u00e9risation.<\/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\/agesin-uv-d7700d-tego-rad-2700\/\">CHLUMICRYL UV-D7700D<\/a>:<\/strong> Helpful when a different UV oligomer route is worth benchmarking in the resin package.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiwe-3280\/\">CHLUMIWE 3280<\/a>:<\/strong> Un agent mouillant de r\u00e9f\u00e9rence puissant pour les encres, les rev\u00eatements et le mouillage des substrats difficiles.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiwe-3071-organic-silicone-surfactant-organosilicone-wetting-agent\/\">CHLUMIWE 3071<\/a>:<\/strong> Utile lorsqu'un support mouillant organosilicon\u00e9 est requis dans un \u00e9cran d'application large.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiag-3000\/\">CHLUMIAG 3000<\/a>:<\/strong> A practical leveling and anti-sticking reference in UV coating and ink-related systems.<\/li>\n<\/ul>\n<h3>FAQ pour les acheteurs et les formulateurs<\/h3>\n<p><strong>Un seul monom\u00e8re ou r\u00e9sine UV peut-il r\u00e9soudre tous les probl\u00e8mes de formulation ?<\/strong><br \/>En g\u00e9n\u00e9ral, non. Les formules performantes sur le march\u00e9 reposent sur la synergie de plusieurs composants qui permettent d&#x27;\u00e9quilibrer le durcissement, l&#x27;adh\u00e9rence, la fluidit\u00e9 et la durabilit\u00e9.<\/p>\n<p><strong>Pourquoi faut-il analyser les monom\u00e8res en m\u00eame temps que les oligom\u00e8res ?<\/strong><br \/>Parce que les monom\u00e8res peuvent modifier la viscosit\u00e9, la vitesse de durcissement, le retrait et le comportement du substrat suffisamment pour alt\u00e9rer le classement final de la m\u00eame r\u00e9sine squelettique.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>Light-curing coatings used oligomer is also known as prepolymer, which has a small molecular weight, has the characteristics of polymerization groups, viscosity, is the main body of light-curing coatings film.<\/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-5596","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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