{"id":5369,"date":"2022-07-12T13:32:13","date_gmt":"2022-07-12T13:32:13","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5369"},"modified":"2024-12-11T15:43:47","modified_gmt":"2024-12-11T15:43:47","slug":"brief-description-of-hydrogen-capturing-photoinitiators","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/brief-description-of-hydrogen-capturing-photoinitiators\/","title":{"rendered":"Br\u00e8ve description des photo-initiateurs capturant l'hydrog\u00e8ne et de leurs deux cat\u00e9gories principales"},"content":{"rendered":"

Br\u00e8ve description des photo-initiateurs capturant l'hydrog\u00e8ne et de leurs deux cat\u00e9gories principales<\/strong><\/h1>\n

Les photo-initiateurs capturant l'hydrog\u00e8ne, \u00e9galement connus sous le nom de photo-initiateurs de type II, sont g\u00e9n\u00e9ralement domin\u00e9s par des structures c\u00e9toniques aromatiques et comprennent \u00e9galement certains hydrocarbures aromatiques \u00e0 anneau \u00e9pais. Ils poss\u00e8dent certaines propri\u00e9t\u00e9s d'absorption de la lumi\u00e8re, et le co-initiateur correspondant, c'est-\u00e0-dire le donneur d'hydrog\u00e8ne, n'a pas d'absorption dans la gamme des UV de grande longueur d'onde. Les photo-initiateurs capturant l'hydrog\u00e8ne absorbent l'\u00e9nergie UV et interagissent de mani\u00e8re bimol\u00e9culaire avec le co-initiateur \u00e0 l'\u00e9tat excit\u00e9 pour produire des radicaux r\u00e9actifs. Les amines tertiaires sont couramment utilis\u00e9es comme co-initiateurs pour l'appariement avec les photo-initiateurs pi\u00e9geant l'hydrog\u00e8ne. Le diagramme suivant prend le photo-initiateur benzoph\u00e9none comme exemple pour d\u00e9crire son processus d'action.<\/p>\n

 <\/p>\n

Premi\u00e8rement, syst\u00e8me photoinitiateur benzoph\u00e9none + amine tertiaire<\/p>\n

Le photo-initiateur benzoph\u00e9none (BP) se pr\u00e9sente g\u00e9n\u00e9ralement sous la forme de cristaux incolores ou l\u00e9g\u00e8rement jaunes, sa solubilit\u00e9 dans les solvants courants est relativement bonne, sa longueur d'onde d'absorption maximale est d'environ 340 nm et la longueur d'onde d'\u00e9mission de la lampe \u00e0 mercure \u00e0 moyenne pression correspond \u00e0 celle du photo-initiateur. Il convient ici de pr\u00eater attention \u00e0 la diff\u00e9rence entre le photo-initiateur benzoph\u00e9none et l'absorbeur UV benzoph\u00e9none, leur structure est relativement similaire, la longueur d'onde d'absorption maximale de l'absorbeur UV benzoph\u00e9none est g\u00e9n\u00e9ralement d'environ 330 nm. La synth\u00e8se du BP est simple, c'est un photo-initiateur peu co\u00fbteux, mais l'activit\u00e9 photo-initiatrice n'est g\u00e9n\u00e9ralement pas aussi bonne que celle du HMPP, du HCPK et d'autres photo-initiateurs de craquage couramment utilis\u00e9s. La vitesse de durcissement des photo-initiateurs de type BP est relativement lente, et il est facile de provoquer un jaunissement du rev\u00eatement durci, et le jaunissement sera aggrav\u00e9 par l'utilisation de grandes quantit\u00e9s de co-initiateurs d'amines tertiaires.<\/p>\n

 <\/p>\n

En tant que photo-initiateur pour la capture de l'hydrog\u00e8ne, le BP pr\u00e9sente \u00e9galement des avantages. Tout d'abord, son faible co\u00fbt et son bas prix peuvent \u00eatre utilis\u00e9s dans certaines formulations \u00e0 faible valeur ajout\u00e9e et \u00e0 faibles exigences de qualit\u00e9. Il s'agit par exemple de rev\u00eatements d\u00e9coratifs et de vernis color\u00e9s pour substrats. Afin d'\u00e9quilibrer le co\u00fbt, le jaunissement, la vitesse de durcissement et d'autres facteurs, le BP est souvent utilis\u00e9 en combinaison avec d'autres photo-initiateurs de craquage, l'application combin\u00e9e du BP et de l'amine active, l'amine active a la fonction de polym\u00e9risation antioxydante, de sorte que la surface du syst\u00e8me BP + amine active a un meilleur effet de polym\u00e9risation antioxydante. Toutefois, il convient de noter que lorsque la quantit\u00e9 de BP est importante, il est facile d'obtenir une couche inf\u00e9rieure de protection contre la lumi\u00e8re.<\/p>\n

 <\/p>\n

Le BP poss\u00e8de de nombreux d\u00e9riv\u00e9s substitu\u00e9s qui sont des photo-initiateurs efficaces, le d\u00e9riv\u00e9 le plus important \u00e9tant la c\u00e9tone de Michler (MK), qui est un substituant 4,4-bis (dialkylamino) du BP, dont la structure commune est illustr\u00e9e dans la figure de gauche.<\/p>\n

La c\u00e9tone de Michler, par rapport \u00e0 la BP, absorbe la longueur d'onde de la lumi\u00e8re d\u00e9cal\u00e9e vers le rouge de dizaines de nanom\u00e8tres, a une forte absorption de la lumi\u00e8re ultraviolette de 365 nm. Parce qu'elle contient une structure d'amine tertiaire, la michanone peut \u00e9galement \u00eatre utilis\u00e9e seule comme photo-initiateur, mais son efficacit\u00e9 n'est pas totalement d\u00e9velopp\u00e9e. Comme MK et BP utilis\u00e9s conjointement avec la photopolym\u00e9risation des acrylates, on a constat\u00e9 que l'activit\u00e9 d'initiation est beaucoup plus \u00e9lev\u00e9e que MK \/ syst\u00e8me d'amine tertiaire et BP \/ syst\u00e8me d'amine tertiaire, la vitesse de polym\u00e9risation est environ 10 fois sup\u00e9rieure \u00e0 celle des deux derniers.<\/p>\n

Deuxi\u00e8mement, syst\u00e8me de photoinitiation thioxanthrone + amine tertiaire<\/p>\n

La thioxanthone est \u00e9galement utilis\u00e9e comme photo-initiateur de capture d'hydrog\u00e8ne, et sa longueur d'onde d'absorption maximale peut atteindre 380~420nm, et le coefficient d'extinction est \u00e9galement plus \u00e9lev\u00e9, environ 102 ordres de grandeur, ce qui permet d'utiliser pleinement l'\u00e9nergie des ondes lumineuses de 365nm et 405nm de la source lumineuse, ce qui est beaucoup plus efficace que le photo-initiateur \u00e0 base de benzoph\u00e9none. En termes de m\u00e9canisme d'initiation, le syst\u00e8me photo-initiateur de la thioxanthrone est similaire \u00e0 celui de la benzoph\u00e9none. Les formules structurelles de la thioxanthone (TX) et de ses diff\u00e9rents d\u00e9riv\u00e9s sont pr\u00e9sent\u00e9es ci-dessous.<\/p>\n

 <\/p>\n

La thioxanthone est une poudre jaune clair tr\u00e8s peu soluble dans la plupart des solvants, ce qui la rend difficile \u00e0 disperser dans les syst\u00e8mes de r\u00e9sine. La plupart d'entre eux ont de bonnes propri\u00e9t\u00e9s de solubilit\u00e9 et de dispersion, et l'absorbance et l'activit\u00e9 photochimique peuvent \u00eatre am\u00e9lior\u00e9es. Les TX substitu\u00e9s courants comprennent la 2-chlorothianthrone (CTX), la CPTX, l'isopropylthioanthrone (ITX) et la 2,4-di\u00e9thylthioanthrone (DETX), etc. La CTX n'est toujours pas satisfaisante en termes de solubilit\u00e9 et a \u00e9t\u00e9 progressivement remplac\u00e9e par les deux derni\u00e8res.<\/p>\n

Les substituants de la thianthrone doivent \u00eatre associ\u00e9s \u00e0 des amines actives appropri\u00e9es pour obtenir une activit\u00e9 photo-initiatrice efficace. Il a \u00e9t\u00e9 constat\u00e9 que le 4-dim\u00e9thylaminobenzoate d'\u00e9thyle (EDAB) est le co-initiateur amin\u00e9 r\u00e9actif le plus appropri\u00e9 pour une utilisation avec la thianthrone, qui est non seulement tr\u00e8s active mais pr\u00e9sente \u00e9galement un jaunissement moins s\u00e9v\u00e8re. L'ITX a \u00e9t\u00e9 largement accept\u00e9 par le march\u00e9 en raison de son co\u00fbt relativement avantageux.<\/p>\n

 <\/p>\n

<\/h2>\n

Contactez-nous d\u00e8s maintenant !<\/b><\/strong><\/h2>\n

Si vous avez besoin de Price, veuillez indiquer vos coordonn\u00e9es dans le formulaire ci-dessous. Nous vous contacterons g\u00e9n\u00e9ralement dans les 24 heures. Vous pouvez \u00e9galement m'envoyer un courriel info@longchangchemical.com<\/a><\/span>\u00a0pendant les heures de travail ( 8:30 am to 6:00 pm UTC+8 Mon.~Sat. ) ou utilisez le chat en direct du site web pour obtenir une r\u00e9ponse rapide.<\/b><\/strong><\/h4>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Photoinitiateur TPO<\/span><\/a><\/td>\nCAS 75980-60-8<\/td>\n<\/tr>\n
Photoinitiateur TMO<\/span><\/a><\/td>\nCAS 270586-78-2<\/td>\n<\/tr>\n
Photoinitiateur PD-01<\/span><\/a><\/td>\nCAS 579-07-7<\/td>\n<\/tr>\n
Photoinitiateur PBZ<\/span><\/a><\/td>\nCAS 2128-93-0<\/td>\n<\/tr>\n
Photoinitiateur OXE-02<\/span><\/a><\/td>\nCAS 478556-66-0<\/td>\n<\/tr>\n
Photoinitiateur OMBB<\/span><\/a><\/td>\nCAS 606-28-0<\/td>\n<\/tr>\n
Photoinitiateur MPBZ (6012)<\/span><\/a><\/td>\nCAS 86428-83-3<\/td>\n<\/tr>\n
Photoinitiateur MBP<\/span><\/a><\/td>\nCAS 134-84-9<\/td>\n<\/tr>\n
Photoinitiateur MBF<\/span><\/a><\/td>\nCAS 15206-55-0<\/td>\n<\/tr>\n
Photoinitiateur LAP<\/span><\/a><\/td>\nCAS 85073-19-4<\/td>\n<\/tr>\n
Photoinitiateur ITX<\/span><\/a><\/td>\nCAS 5495-84-1<\/td>\n<\/tr>\n
Photoinitiateur EMK<\/span><\/a><\/td>\nCAS 90-93-7<\/td>\n<\/tr>\n
Photoinitiateur EHA<\/span><\/a><\/td>\nCAS 21245-02-3<\/td>\n<\/tr>\n
Photo-initiateur EDB<\/span><\/a><\/td>\nCAS 10287-53-3<\/td>\n<\/tr>\n
Photoinitiateur DETX<\/span><\/a><\/td>\nCAS 82799-44-8<\/td>\n<\/tr>\n
Photoinitiateur CQ \/ Camphorquinone<\/span><\/a><\/td>\nCAS 10373-78-1<\/td>\n<\/tr>\n
Photoinitiateur CBP<\/span><\/a><\/td>\nCAS 134-85-0<\/td>\n<\/tr>\n
Photo-initiateur BP \/ Benzoph\u00e9none<\/span><\/a><\/td>\nCAS 119-61-9<\/td>\n<\/tr>\n
Photoinitiateur BMS<\/span><\/a><\/td>\nCAS 83846-85-9<\/td>\n<\/tr>\n
Photoinitiateur 938<\/span><\/a><\/td>\nCAS 61358-25-6<\/td>\n<\/tr>\n
Photoinitiateur 937<\/span><\/a><\/td>\nCAS 71786-70-4<\/td>\n<\/tr>\n
Photo-initiateur 819 DW<\/span><\/a><\/td>\nCAS 162881-26-7<\/td>\n<\/tr>\n
Photoinitiateur 819<\/span><\/a><\/td>\nCAS 162881-26-7<\/td>\n<\/tr>\n
Photoinitiateur 784<\/span><\/a><\/td>\nCAS 125051-32-3<\/td>\n<\/tr>\n
Photoinitiateur 754<\/span><\/a><\/td>\nCAS 211510-16-6 442536-99-4<\/td>\n<\/tr>\n
Photoinitiateur 6993<\/span><\/a><\/td>\nCAS 71449-78-0<\/td>\n<\/tr>\n
Photoinitiateur 6976<\/span><\/a><\/td>\nCAS 71449-78-0 89452-37-9 108-32-7<\/td>\n<\/tr>\n
Photoinitiateur 379<\/span><\/a><\/td>\nCAS 119344-86-4<\/td>\n<\/tr>\n
Photoinitiateur 369<\/span><\/a><\/td>\nCAS 119313-12-1<\/td>\n<\/tr>\n
Photoinitiateur 160<\/a><\/span><\/td>\nCAS 71868-15-0<\/td>\n<\/tr>\n
Photoinitiateur 1206<\/span><\/a><\/td>\n<\/td>\n<\/tr>\n
Photoinitiateur 1173<\/span><\/a><\/td>\nCAS 7473-98-5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

Br\u00e8ve description des photo-initiateurs capturant l'hydrog\u00e8ne et de leurs deux cat\u00e9gories principales Les photo-initiateurs capturant l'hydrog\u00e8ne, \u00e9galement connus sous le nom de photo-initiateurs de type II, sont g\u00e9n\u00e9ralement domin\u00e9s par les structures c\u00e9toniques aromatiques et comprennent \u00e9galement certains hydrocarbures aromatiques \u00e0 anneau \u00e9pais. Ils poss\u00e8dent certaines propri\u00e9t\u00e9s d'absorption de la lumi\u00e8re, et le co-initiateur correspondant, c'est-\u00e0-dire le donneur d'hydrog\u00e8ne, n'a pas d'absorption dans la gamme des UV de grande longueur d'onde. Les photo-initiateurs captant l'hydrog\u00e8ne [...]<\/p>","protected":false},"author":1,"featured_media":5188,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-5369","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"\nBrief description of hydrogen-capturing photoinitiators and their two main categories - 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\/brief-description-of-hydrogen-capturing-photoinitiators\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Brief description of hydrogen-capturing photoinitiators and their two main categories - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"Brief description of hydrogen-capturing photoinitiators and their two main categories Hydrogen-capturing photoinitiators, also known as type II photoinitiators, are generally dominated by aromatic ketone structures and also include certain thick-ringed aromatic hydrocarbons. 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