{"id":5406,"date":"2022-07-24T05:44:35","date_gmt":"2022-07-24T05:44:35","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5406"},"modified":"2022-07-24T06:00:32","modified_gmt":"2022-07-24T06:00:32","slug":"brief-description-of-the-role-of-antioxidants-in-plastics-and-their-selection-principles","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/brief-description-of-the-role-of-antioxidants-in-plastics-and-their-selection-principles\/","title":{"rendered":"Br\u00e8ve description du r\u00f4le des antioxydants dans les mati\u00e8res plastiques et de leurs principes de s\u00e9lection"},"content":{"rendered":"

Br\u00e8ve description du r\u00f4le des antioxydants dans les mati\u00e8res plastiques et de leurs principes de s\u00e9lection<\/strong><\/h1>\n

L'ajout d'antioxydants appropri\u00e9s lors de la transformation des mati\u00e8res plastiques peut arr\u00eater ou retarder le processus de vieillissement, prolongeant ainsi la dur\u00e9e de vie des produits en plastique. Le choix des antioxydants doit se faire en fonction du type de plastique, de l'\u00e9quipement de transformation, des conditions de traitement, de la vari\u00e9t\u00e9 des autres additifs et de la quantit\u00e9 ajout\u00e9e, de l'environnement dans lequel le produit est utilis\u00e9 et de la dur\u00e9e de vie du produit. Le choix des antioxydants pour les mati\u00e8res plastiques doit se fonder sur les principes suivants.<\/p>\n

I. Compatibilit\u00e9. La compatibilit\u00e9 entre les polym\u00e8res plastiques et les antioxydants est souvent m\u00e9diocre ; en g\u00e9n\u00e9ral, \u00e0 haute temp\u00e9rature, l'antioxydant et le polym\u00e8re fondent ensemble ; le durcissement du polym\u00e8re est compatible avec les mol\u00e9cules d'antioxydant qui se trouvent au milieu des mol\u00e9cules de polym\u00e8re. Dans la plage de dosage de la formulation, l'antioxydant doit \u00eatre fondu \u00e0 la temp\u00e9rature de traitement. Lors de la conception des formulations, le choix des antioxydants solides, des stabilisateurs de lumi\u00e8re, du point de fusion ou de la plage de fusion de la limite sup\u00e9rieure, ne doit pas \u00eatre sup\u00e9rieur \u00e0 la temp\u00e9rature de transformation des polym\u00e8res plastiques.<\/p>\n

Deuxi\u00e8mement, la migration. Les produits en plastique, en particulier la surface et le rapport de volume (ou le rapport de masse) de la plus petite valeur du produit, l'oxydation se produit principalement sur la surface du produit, ce qui n\u00e9cessite une migration continue des antioxydants des produits en plastique vers la surface du produit et joue un r\u00f4le. Toutefois, si la vitesse de migration vers la surface du produit est trop rapide, la quantit\u00e9 de migration est trop importante, l'antioxydant doit \u00eatre volatile \u00e0 la surface du produit dans l'environnement, ou l'agent de diffusion et le contact de la surface du produit avec d'autres milieux et la perte, cette perte est en fait in\u00e9vitable, les formulations de conception \u00e0 prendre en compte. Lorsqu'il y a un choix de vari\u00e9t\u00e9s d'antioxydants, il faut choisir un poids mol\u00e9culaire relativement \u00e9lev\u00e9, un point de fusion appropri\u00e9 \u00e0 des esp\u00e8ces \u00e9lev\u00e9es, et \u00e0 l'utilisation la plus s\u00e9v\u00e8re de l'environnement pour d\u00e9terminer la quantit\u00e9 d'antioxydant \u00e0 utiliser.<\/p>\n

Troisi\u00e8mement, la stabilit\u00e9. L'antioxydant dans les mati\u00e8res plastiques doit rester stable, dans l'utilisation de l'environnement et le traitement \u00e0 haute temp\u00e9rature perte volatile, pas de d\u00e9coloration ou de couleur, pas de d\u00e9composition (en plus du r\u00f4le des antioxydants pour la stabilisation de la chaleur de traitement), pas avec d'autres additifs r\u00e9actions chimiques d\u00e9favorables, pas corrosif machines et \u00e9quipements, pas facilement extrait par d'autres substances sur la surface du produit.<\/p>\n

Quatri\u00e8mement, la facilit\u00e9 de traitement. Lors de la transformation des produits en plastique, l'ajout d'antioxydants peut modifier la viscosit\u00e9 de la r\u00e9sine et le couple de serrage de la vis. Si la diff\u00e9rence entre l'antioxydant et la plage de fusion de la r\u00e9sine est importante, le flux de l'antioxydant sera biais\u00e9 ou le ph\u00e9nom\u00e8ne d'inhibition de la vis se produira. Le point de fusion de l'antioxydant \u00e9tant inf\u00e9rieur \u00e0 la temp\u00e9rature de traitement de 100 \u2103 ou plus, l'antioxydant doit d'abord \u00eatre transform\u00e9 en un certain lot principal, puis m\u00e9lang\u00e9 aux produits de traitement de la r\u00e9sine, afin d'\u00e9viter une distribution in\u00e9gale de l'antioxydant dans le produit en raison d'un flux de biais et d'une baisse du rendement du traitement.<\/p>\n

Cinqui\u00e8mement, l'environnement et la sant\u00e9. L'antioxydant doit \u00eatre non toxique ou faiblement toxique, non poussi\u00e9reux ou faiblement poussi\u00e9reux, ne pas avoir d'effets nocifs sur le corps humain lors de la transformation et de l'utilisation des produits en plastique, ne pas nuire aux animaux et aux plantes, ne pas polluer l'air, le sol et l'eau.<\/p>\n

 <\/p>\n

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

Br\u00e8ve description du r\u00f4le des antioxydants dans les plastiques et de leurs principes de s\u00e9lection L'ajout d'antioxydants appropri\u00e9s dans la transformation des plastiques peut arr\u00eater ou retarder le processus de vieillissement, prolongeant ainsi la dur\u00e9e de vie des produits en plastique. Le choix des antioxydants doit se faire en fonction du type de plastique, de l'\u00e9quipement de transformation, des conditions de transformation, de la vari\u00e9t\u00e9 des [...]<\/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-5406","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"\nBrief description of the role of antioxidants in plastics and their selection principles - 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-the-role-of-antioxidants-in-plastics-and-their-selection-principles\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Brief description of the role of antioxidants in plastics and their selection principles - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"Brief description of the role of antioxidants in plastics and their selection principles The addition of suitable antioxidants in plastic processing can stop or delay the ageing process, thus extending the service life of plastic products. 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