{"id":4976,"date":"2022-01-13T06:41:14","date_gmt":"2022-01-13T06:41:14","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=4976"},"modified":"2024-12-11T15:28:50","modified_gmt":"2024-12-11T15:28:50","slug":"why-use-a-composite-photoinitiator-in-light-curing-formulating","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/why-use-a-composite-photoinitiator-in-light-curing-formulating\/","title":{"rendered":"Pourquoi utiliser un photo-initiateur composite dans les formulations photopolym\u00e9risables ?"},"content":{"rendered":"

Pourquoi utiliser un photo-initiateur composite dans les formulations photopolym\u00e9risables ?<\/strong><\/h1>\r\n

Les photo-initiateurs sont un composant tr\u00e8s important des formulations photodurcissables et sont une source de radicaux libres. Toutefois, l'utilisation excessive de photo-initiateurs entra\u00eene de nombreux probl\u00e8mes, tels que l'augmentation des substances migratoires, la r\u00e9duction de la r\u00e9sistance aux intemp\u00e9ries, l'\u00e9paisseur insuffisante du film de rev\u00eatement durci et l'augmentation des co\u00fbts.<\/p>\r\n\r\n\r\n\r\n

Des exp\u00e9riences ont montr\u00e9 que l'utilisation de photo-initiateurs composites dans les formulations de photopolym\u00e9risation permet de surmonter efficacement les probl\u00e8mes susmentionn\u00e9s, ce qui pr\u00e9sente de nombreux avantages. Il est particuli\u00e8rement important d'obtenir de meilleurs r\u00e9sultats de durcissement.<\/p>\r\n\r\n\r\n\r\n

Quatre photo-initiateurs courants ont \u00e9t\u00e9 utilis\u00e9s dans les exp\u00e9riences : 184, 1173, TPO et 819. D'un point de vue chimique, ils appartiennent \u00e0 deux classes de compos\u00e9s : les \u03b1-hydroxyc\u00e9tones et les oxydes d'acylphosphine.<\/p>\r\n\r\n\r\n\r\n

\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Nom anglais<\/td>\r\nNom du produit<\/td>\r\nNum\u00e9ro CAS<\/td>\r\n<\/tr>\r\n
HCPK<\/td>\r\nphoto-initiateur 184<\/td>\r\n947-19-3<\/td>\r\n<\/tr>\r\n
HMPP<\/td>\r\nphoto-initiateur 1173<\/span><\/strong><\/td>\r\n7473-98-5<\/td>\r\n<\/tr>\r\n
TPO<\/td>\r\nphoto-initiateur TPO<\/strong><\/span><\/td>\r\n75980-60-8<\/td>\r\n<\/tr>\r\n
BAPO<\/td>\r\nphoto-initiateur 819<\/span><\/strong><\/td>\r\n162881-26-7<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n
\"\"\r\n
Image 1<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

L'\u00e9quipement de durcissement utilis\u00e9 dans l'exp\u00e9rience est une lampe \u00e0 mercure Oriel de 100 watts (le spectre d'\u00e9mission est montr\u00e9 dans l'image 2), et l'\u00e9paisseur du film est contr\u00f4l\u00e9e \u00e0 50 \u03bcm.<\/p>\r\n\r\n\r\n\r\n

\"\"\r\n
Image 2 Spectre d'\u00e9mission de la lampe \u00e0 mercure Oriel 100W<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

Le degr\u00e9 de durcissement a \u00e9t\u00e9 d\u00e9tect\u00e9 par spectroscopie infrarouge \u00e0 transform\u00e9e de Fourier (FTIR) pour contr\u00f4ler le changement du pic d'absorption caract\u00e9ristique de la double liaison insatur\u00e9e de l'acrylate \u00e0 810 cm-1. La bande 750-780 cm-1 a \u00e9galement \u00e9t\u00e9 utilis\u00e9e comme pic de r\u00e9f\u00e9rence car elle ne change pas pendant tout le processus de photopolym\u00e9risation.<\/p>\r\n\r\n\r\n\r\n

 <\/p>\r\n\r\n\r\n\r\n

La formule de calcul du taux de conversion de la double liaison (Reacted Acrylate Unsaturation, RAU) est la suivante :<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

O\u00f9 RL<\/sub><\/em> est le rapport entre le pic d'absorption de la double liaison acrylate et le pic de r\u00e9f\u00e9rence \u00e0 l'\u00e9tat liquide ; et RC<\/sub><\/em> est le rapport entre le pic d'absorption de la double liaison acrylate et le pic de r\u00e9f\u00e9rence apr\u00e8s le durcissement aux UV.<\/p>\r\n\r\n\r\n\r\n

\"\"\r\n
Image 3 Spectre d'absorption du HCPK (photo-initiateur 184)<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n
\"\"\r\n
Figure 4 Spectre d'absorption du HMPP (photo-initiateur 1173)<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n
\"\"\r\n
Image 5 Spectre d'absorption du TPO<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n
\"\"\r\n
Image 6 Spectre d'absorption du BAPO (photo-initiateur 819)<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

L'absorption principale du HCPK (photo-initiateur 184) se situe dans la gamme de longueurs d'onde de 240-250 nm, et le pic d'absorption se situe dans la gamme de 320-335 nm. Un autre photo-initiateur hydroxyc\u00e9tone, le HMPP (Darocur 1173), pr\u00e9sente une absorption similaire dans la plage 320-335 nm avec un pic \u00e0 265-280 nm. En combinant ces deux photo-initiateurs, il est d\u00e9j\u00e0 possible de commencer \u00e0 mieux utiliser la puissance de la lampe UV (figure 2).<\/p>\r\n\r\n\r\n\r\n

Les spectres du TPO et du BAPO (photo-initiateur 819) sont sensiblement diff\u00e9rents des deux pr\u00e9c\u00e9dents, le photo-initiateur TPO a une forte absorption dans la plage de 360-395 nm, et le BAPO a une plus forte absorption dans la plage de 360-410 nm. L'ajout de ces deux derniers photo-initiateurs permet de mieux utiliser les deux autres bandes de longueur d'onde principales de la lampe \u00e0 mercure, \u00e0 savoir 370 et 408 nm.<\/p>\r\n\r\n\r\n\r\n

Dans la premi\u00e8re exp\u00e9rience, la m\u00eame quantit\u00e9 (rapport de poids) de 184 et de photo-initiateur composite a \u00e9t\u00e9 utilis\u00e9e \u00e0 des fins de comparaison. Sous irradiation de lumi\u00e8re UV avec la m\u00eame \u00e9nergie de 4,5mJ\/cm2, le taux de conversion de la double liaison de la formule utilisant 184 est de 24,8%, tandis que celui de la formule du photo-initiateur composite atteint 79,6%.<\/p>\r\n\r\n\r\n\r\n

\"\"\r\n
Comparaison de 4% HCPK (photo-initiateur 184) et du photo-initiateur composite<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

La deuxi\u00e8me exp\u00e9rience consiste \u00e0 utiliser 6% de 184 et un photo-initiateur composite sous une \u00e9nergie d'irradiation de 4,5mJ\/cm2, le taux de conversion de la double liaison du premier est de 18,9%, et celui du second atteint 67,2%. La diff\u00e9rence est tr\u00e8s importante.<\/p>\r\n\r\n\r\n\r\n

\"\"\r\n
Comparaison de 6% HCPK (photo-initiateur184) et du photo-initiateur composite<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

La troisi\u00e8me exp\u00e9rience a utilis\u00e9 4% 184 et 3% photo-initiateur composite, respectivement, ce qui signifie que la derni\u00e8re formulation utilisant un photo-initiateur composite a utilis\u00e9 une quantit\u00e9 plus faible de photo-initiateur. Sous la m\u00eame \u00e9nergie d'irradiation (4,5mJ\/cm2), le taux de conversion de la double liaison de la premi\u00e8re formule est de 50,9%, tandis que celui de la seconde est de 66,8%, ce qui est plus \u00e9lev\u00e9.<\/p>\r\n\r\n\r\n\r\n

\"\"\r\n
Comparaison entre 4% HCPK (photo-initiateur 184) et 3% photo-initiateur composite<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

La quatri\u00e8me exp\u00e9rience a utilis\u00e9 respectivement 6% 184 et 4,5% photo-initiateur composite. Lorsque l'\u00e9nergie de rayonnement reste la m\u00eame (4,5mJ\/cm2), le taux de conversion de la double liaison est de 58,3% dans le premier cas et de 67,9% dans le second. Les troisi\u00e8me et quatri\u00e8me exp\u00e9riences montrent que le taux de conversion de la double liaison peut \u00eatre plus \u00e9lev\u00e9 pour la formulation du photo-initiateur composite, m\u00eame avec une plus petite quantit\u00e9.<\/p>\r\n\r\n\r\n\r\n

\"\"\r\n
Comparaison de 6% HCPK (photo-initiateur 184) et de 4,5% photo-initiateur composite<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

Les r\u00e9sultats exp\u00e9rimentaux montrent que l'utilisation de photo-initiateurs composites peut consid\u00e9rablement am\u00e9liorer l'efficacit\u00e9 d'amor\u00e7age des photo-initiateurs. Bien que les exp\u00e9riences ci-dessus n'aient compar\u00e9 qu'un photo-initiateur (le photo-initiateur 184) comme objet de r\u00e9f\u00e9rence et que l'\u00e9quipement d'irradiation n'ait \u00e9t\u00e9 utilis\u00e9 qu'avec une lampe \u00e0 mercure, les r\u00e9sultats peuvent \u00e9galement illustrer de mani\u00e8re suffisante les avantages des photo-initiateurs composites.<\/p>\r\n\r\n\r\n\r\n

Nous savons que l'utilisation de photo-initiateurs dans la formule n'est pas la meilleure, car une trop grande quantit\u00e9 de photo-initiateurs absorbe la lumi\u00e8re ultraviolette, ce qui affecte grandement l'efficacit\u00e9 de la p\u00e9n\u00e9tration de la lumi\u00e8re ultraviolette pendant le durcissement en profondeur, affectant ainsi la profondeur du durcissement.<\/p>\r\n\r\n\r\n\r\n

L'utilisation de ce photo-initiateur composite permet non seulement de r\u00e9duire le co\u00fbt des formulations, mais aussi d'obtenir un meilleur durcissement en profondeur, de r\u00e9duire les r\u00e9sidus de photo-initiateur et de diminuer les co\u00fbts.<\/p>\r\n

 <\/p>\r\n

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

 <\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Photoinitiateur TPO<\/span><\/a><\/td>\r\nCAS 75980-60-8<\/td>\r\n<\/tr>\r\n
Photoinitiateur TMO<\/span><\/a><\/td>\r\nCAS 270586-78-2<\/td>\r\n<\/tr>\r\n
Photoinitiateur PD-01<\/span><\/a><\/td>\r\nCAS 579-07-7<\/td>\r\n<\/tr>\r\n
Photoinitiateur PBZ<\/span><\/a><\/td>\r\nCAS 2128-93-0<\/td>\r\n<\/tr>\r\n
Photoinitiateur OXE-02<\/span><\/a><\/td>\r\nCAS 478556-66-0<\/td>\r\n<\/tr>\r\n
Photoinitiateur OMBB<\/span><\/a><\/td>\r\nCAS 606-28-0<\/td>\r\n<\/tr>\r\n
Photoinitiateur MPBZ (6012)<\/span><\/a><\/td>\r\nCAS 86428-83-3<\/td>\r\n<\/tr>\r\n
Photoinitiateur MBP<\/span><\/a><\/td>\r\nCAS 134-84-9<\/td>\r\n<\/tr>\r\n
Photoinitiateur MBF<\/span><\/a><\/td>\r\nCAS 15206-55-0<\/td>\r\n<\/tr>\r\n
Photoinitiateur LAP<\/span><\/a><\/td>\r\nCAS 85073-19-4<\/td>\r\n<\/tr>\r\n
Photoinitiateur ITX<\/span><\/a><\/td>\r\nCAS 5495-84-1<\/td>\r\n<\/tr>\r\n
Photoinitiateur EMK<\/span><\/a><\/td>\r\nCAS 90-93-7<\/td>\r\n<\/tr>\r\n
Photoinitiateur EHA<\/span><\/a><\/td>\r\nCAS 21245-02-3<\/td>\r\n<\/tr>\r\n
Photo-initiateur EDB<\/span><\/a><\/td>\r\nCAS 10287-53-3<\/td>\r\n<\/tr>\r\n
Photoinitiateur DETX<\/span><\/a><\/td>\r\nCAS 82799-44-8<\/td>\r\n<\/tr>\r\n
Photoinitiateur CQ \/ Camphorquinone<\/span><\/a><\/td>\r\nCAS 10373-78-1<\/td>\r\n<\/tr>\r\n
Photoinitiateur CBP<\/span><\/a><\/td>\r\nCAS 134-85-0<\/td>\r\n<\/tr>\r\n
Photo-initiateur BP \/ Benzoph\u00e9none<\/span><\/a><\/td>\r\nCAS 119-61-9<\/td>\r\n<\/tr>\r\n
Photoinitiateur BMS<\/span><\/a><\/td>\r\nCAS 83846-85-9<\/td>\r\n<\/tr>\r\n
Photoinitiateur 938<\/span><\/a><\/td>\r\nCAS 61358-25-6<\/td>\r\n<\/tr>\r\n
Photoinitiateur 937<\/span><\/a><\/td>\r\nCAS 71786-70-4<\/td>\r\n<\/tr>\r\n
Photo-initiateur 819 DW<\/span><\/a><\/td>\r\nCAS 162881-26-7<\/td>\r\n<\/tr>\r\n
Photoinitiateur 819<\/span><\/a><\/td>\r\nCAS 162881-26-7<\/td>\r\n<\/tr>\r\n
Photoinitiateur 784<\/span><\/a><\/td>\r\nCAS 125051-32-3<\/td>\r\n<\/tr>\r\n
Photoinitiateur 754<\/span><\/a><\/td>\r\nCAS 211510-16-6 442536-99-4<\/td>\r\n<\/tr>\r\n
Photoinitiateur 6993<\/span><\/a><\/td>\r\nCAS 71449-78-0<\/td>\r\n<\/tr>\r\n
Photoinitiateur 6976<\/span><\/a><\/td>\r\nCAS 71449-78-0 89452-37-9 108-32-7<\/td>\r\n<\/tr>\r\n
Photoinitiateur 379<\/span><\/a><\/td>\r\nCAS 119344-86-4<\/td>\r\n<\/tr>\r\n
Photoinitiateur 369<\/span><\/a><\/td>\r\nCAS 119313-12-1<\/td>\r\n<\/tr>\r\n
Photoinitiateur 160<\/a><\/span><\/td>\r\nCAS 71868-15-0<\/td>\r\n<\/tr>\r\n
Photoinitiateur 1206<\/span><\/a><\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
Photoinitiateur 1173<\/span><\/a><\/td>\r\nCAS 7473-98-5<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

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

Pourquoi utiliser un photo-initiateur composite dans les formulations photopolym\u00e9risables ? Les photo-initiateurs sont un composant tr\u00e8s important des formulations photor\u00e9ticulables et sont une source de radicaux libres. Toutefois, l'utilisation excessive de photo-initiateurs entra\u00eene de nombreux probl\u00e8mes, tels que l'augmentation des substances migratoires, la r\u00e9duction de la r\u00e9sistance aux intemp\u00e9ries, l'\u00e9paisseur insuffisante du film de rev\u00eatement durci et l'augmentation des co\u00fbts. Des exp\u00e9riences ont montr\u00e9 [...]<\/p>","protected":false},"author":1,"featured_media":4977,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[185],"tags":[],"class_list":["post-4976","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-photoinitiator"],"yoast_head":"\nWhy use a composite photoinitiator in light curing formulating? - 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\/why-use-a-composite-photoinitiator-in-light-curing-formulating\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why use a composite photoinitiator in light curing formulating? - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"Why use a composite photoinitiator in light curing formulating? Photoinitiators are a very important component of photocurable formulations and are a source of free radicals. However, excessive use of photoinitiators will bring many problems, such as more migratory substances, reduced weather resistance, insufficient cured thickness of the coating film, and increased cost. 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