{"id":1736,"date":"2024-05-13T03:23:25","date_gmt":"2024-05-13T03:23:25","guid":{"rendered":"https:\/\/chicchem.com\/?p=1736"},"modified":"2024-05-30T14:26:47","modified_gmt":"2024-05-30T14:26:47","slug":"application-and-dosage-of-antioxidants-in-plastics","status":"publish","type":"post","link":"https:\/\/chicchem.com\/fr\/application-and-dosage-of-antioxidants-in-plastics\/","title":{"rendered":"Application et dosage des antioxydants dans les plastiques"},"content":{"rendered":"<p><strong>Description sommaire:<\/strong> Les antioxydants sont une classe de produits chimiques qui, lorsqu&#039;ils sont pr\u00e9sents en petite quantit\u00e9 seulement dans un syst\u00e8me polym\u00e8re, peuvent retarder ou inhiber le processus d&#039;oxydation du polym\u00e8re, emp\u00eachant ainsi son vieillissement et prolongeant sa dur\u00e9e de vie. Connu comme \u00ab agent anti-\u00e2ge \u00bb.<\/p>\n<p>Les antioxydants sont une classe de produits chimiques qui, lorsqu&#039;ils sont pr\u00e9sents en petite quantit\u00e9 seulement dans un syst\u00e8me polym\u00e8re, peuvent retarder ou inhiber le processus d&#039;oxydation du polym\u00e8re, emp\u00eachant ainsi son vieillissement et prolongeant sa dur\u00e9e de vie. Ils sont \u00e9galement appel\u00e9s \u00ab Agent anti-\u00e2ge \u00bb. Les antioxydants peuvent \u00eatre divis\u00e9s en antioxydants principaux, antioxydants auxiliaires et antioxydants m\u00e9talliques. Les antioxydants auxiliaires peuvent \u00eatre divis\u00e9s en antioxydants de phosphore, antioxydants de thio\u00e9ther et purificateurs de m\u00e9taux.<br \/>\n<strong>1. Application en polypropyl\u00e8ne :<\/strong><br \/>\nDans des circonstances normales, la temp\u00e9rature de traitement du polypropyl\u00e8ne est de 220 \u00e0 280\u00b0C. Si des antioxydants ne sont pas ajout\u00e9s, une d\u00e9gradation thermique se produira \u00e0 la temp\u00e9rature de traitement, entra\u00eenant une augmentation de l&#039;indice de fluidit\u00e9. Les syst\u00e8mes antioxydants couramment utilis\u00e9s dans l&#039;industrie sont principalement des ph\u00e9nols de poids mol\u00e9culaire relatif plus \u00e9lev\u00e9, tels que 330, 1010, 1076, etc. Le dosage est de 0,05 \u00e0 0,25%, souvent utilis\u00e9 avec le st\u00e9arate de calcium.<br \/>\n<strong>2. Application en poly\u00e9thyl\u00e8ne :<\/strong><br \/>\nPh\u00e9nols encombr\u00e9s de poids mol\u00e9culaire \u00e9lev\u00e9, tels que les antioxydants CA, 330, 1010, 1076, etc. L&#039;antioxydant 1076 est g\u00e9n\u00e9ralement utilis\u00e9 dans le poly\u00e9thyl\u00e8ne haute densit\u00e9. Si la temp\u00e9rature de traitement est tr\u00e8s \u00e9lev\u00e9e, il est recommand\u00e9 de choisir des antioxydants 1010 et de l&#039;acide phosphorique. Pour le poly\u00e9thyl\u00e8ne chimiquement r\u00e9ticul\u00e9, des thiobisph\u00e9nols et des d\u00e9riv\u00e9s de dioxyde de quinol\u00e9ine polym\u00e9ris\u00e9s peuvent \u00eatre utilis\u00e9s. Dosage 0,1 ~ 0,25.<br \/>\n<strong>3. Application aux plastiques styr\u00e9niques :<\/strong><br \/>\nLe polystyr\u00e8ne est sensible \u00e0 la photooxydation. Apr\u00e8s oxydation, le produit appara\u00eetra jaunissant et cassant. L&#039;utilisation de l&#039;acide 3-(3,5-di-tert-butyl-4-hydroxybenzopropionique) octad\u00e9cyle a non seulement des effets antioxydants, mais poss\u00e8de \u00e9galement des propri\u00e9t\u00e9s anti-photooxydation. effet. Si une quantit\u00e9 appropri\u00e9e d&#039;absorbeur UV est ajout\u00e9e, l&#039;effet synergique sera meilleur. Dosage 0,1 ~ 0,2%.<br \/>\n<strong>4. Application en r\u00e9sine ABS :<\/strong><br \/>\nLes phosphites peuvent \u00eatre utilis\u00e9s avec les antioxydants ph\u00e9noliques 1076, 1010, 2246, 246. Ou du DLTP (thiodipropionate de dilauryle), du TNP (phosphite de trinonylph\u00e9nyle), etc. peuvent \u00eatre ajout\u00e9s.<\/p>","protected":false},"excerpt":{"rendered":"<p>Description sommaire\u00a0: Les antioxydants sont une classe de produits chimiques qui, lorsqu&#039;ils sont pr\u00e9sents en petite quantit\u00e9 seulement dans un syst\u00e8me polym\u00e8re, peuvent retarder ou inhiber le processus d&#039;oxydation du polym\u00e8re, emp\u00eachant ainsi son vieillissement et prolongeant sa dur\u00e9e de vie. Connu comme \u00ab agent anti-\u00e2ge \u00bb. Les antioxydants sont une classe de produits chimiques qui, lorsqu&#039;ils sont pr\u00e9sents [\u2026]<\/p>","protected":false},"author":1,"featured_media":1743,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/posts\/1736","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/comments?post=1736"}],"version-history":[{"count":0,"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/posts\/1736\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/media\/1743"}],"wp:attachment":[{"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/media?parent=1736"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/categories?post=1736"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chicchem.com\/fr\/wp-json\/wp\/v2\/tags?post=1736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}