{"id":5596,"date":"2022-09-23T08:37:38","date_gmt":"2022-09-23T08:37:38","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5596"},"modified":"2022-09-23T08:37:38","modified_gmt":"2022-09-23T08:37:38","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":"

Oligom\u00e8res UV utilis\u00e9s dans les vernis photopolym\u00e9risables<\/strong><\/h1>\n

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

Les formulations de rev\u00eatements photopolym\u00e9risables sont complexes et pr\u00e9sentent les performances suivantes.<\/p>\n

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

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

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

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

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

4. Oligom\u00e8res UV \u00e0 base d'eau, type \u00e9mulsion courante, type dispersion dans l'eau, type soluble dans l'eau.<\/p>\n

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

Troisi\u00e8mement, la conception de la formule du rev\u00eatement photopolym\u00e9risable (UV) lors du choix de la r\u00e9sine.<\/p>\n

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

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

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

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

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

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

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

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>","protected":false},"excerpt":{"rendered":"

Oligom\u00e8res UV utilis\u00e9s dans les rev\u00eatements photopolym\u00e9risables L'oligom\u00e8re utilis\u00e9 dans 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 y a des radicaux libres [...]<\/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":"\nUV oligomers used in light-curing coatings - Longchang Chemical<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/fr\/uv-oligomers-used-in-light-curing-coatings\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UV oligomers used in light-curing coatings - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"UV oligomers used in light-curing coatings 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. 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