{"id":8639,"date":"2025-05-16T06:54:57","date_gmt":"2025-05-16T06:54:57","guid":{"rendered":"https:\/\/changhongchemical.com\/?p=8639"},"modified":"2026-04-27T11:18:16","modified_gmt":"2026-04-27T11:18:16","slug":"antioxidants-used-in-polymers","status":"publish","type":"post","link":"https:\/\/changhongchemical.com\/pt\/antioxidants-used-in-polymers\/","title":{"rendered":"Antioxidantes usados em pol\u00edmeros"},"content":{"rendered":"

(1) Antioxidantes fen\u00f3licos
\nPhenolic antioxidants are the most widely used and most abundant antioxidants in polymer materials. The phenolic hydroxyl group in phenolic antioxidants can release active hydrogen to capture the \u2018key offender\u2019 free radicals in polymer degradation. Natural products such as VE, tea polyphenols, and low molecular compounds such as 2,6-di-tert-butylphenol (BHT) are phenolic antioxidants. Hindered phenolic antioxidants are a class of compounds with substituents on one or both sides of the hydroxyl group (-OH) on the benzene ring. Because the hydroxyl group is spatially hindered, the H atom is easily dislodged from the molecule with peroxyl radicals (ROO .) , alkoxyl radicals (RO.), hydroxyl radicals (.OH), etc. to combine to make them inactive, thus terminating the chain reaction of thermo-oxidative aging. Hindered phenolic antioxidants are non-polluting products and are suitable for colourless or light-coloured products. Moreover, hindered phenolic antioxidants have large molecular weight, good compatibility with polymer materials and low toxicity, so the consumption ratio of high molecular weight hindered phenolic varieties represented by 1010<\/a> and 1076 increases year by year, while 1010 becomes the most excellent product among polymer antioxidants with high molecular weight, good compatibility with polymer materials, excellent antioxidant effect, good safety, and the largest consumption.
\n(2) Antioxidantes de fosfito
\nA principal fun\u00e7\u00e3o do antioxidante de fosfito \u00e9 remover os hidroper\u00f3xidos, e n\u00e3o apenas a degrada\u00e7\u00e3o do pol\u00edmero produzir\u00e1 hidroper\u00f3xidos, e o antioxidante principal para inibir a adi\u00e7\u00e3o de hidroper\u00f3xidos ao mesmo tempo tamb\u00e9m produzir\u00e1 hidroper\u00f3xidos. Portanto, como um antioxidante auxiliar, os antioxidantes de fosfito n\u00e3o s\u00e3o muito eficazes quando usados sozinhos, mas t\u00eam um efeito significativo quando usados junto com o antioxidante principal. O produto representativo do antioxidante fosfito 168 \u00e9 a produ\u00e7\u00e3o nacional e o consumo de variedades de antioxidantes que perde apenas para o 1010. Os produtos 626 e 618 s\u00e3o usados principalmente para o processamento em alta temperatura de materiais ou produtos polim\u00e9ricos em torno de 300 \u2103, o papel dos materiais polim\u00e9ricos para melhorar efetivamente a resist\u00eancia \u00e0 oxida\u00e7\u00e3o t\u00e9rmica em alta temperatura, mantendo a boa apar\u00eancia dos produtos polim\u00e9ricos.
\n(3) Antioxidantes de enxofre
\nOs antioxidantes de enxofre e os antioxidantes de f\u00f3sforo s\u00e3o semelhantes \u00e0 fun\u00e7\u00e3o principal de remover os hidroper\u00f3xidos, mas tamb\u00e9m s\u00e3o antioxidantes auxiliares. A produ\u00e7\u00e3o nacional de antioxidantes contendo enxofre, de acordo com a estrutura molecular, pode ser dividida em tr\u00eas variedades de antioxidantes de \u00e9ster de enxofre, antioxidantes de bisfenol de enxofre e antioxidantes fen\u00f3licos de \u00e9ter de enxofre. A mol\u00e9cula do antioxidante de tiobisfenol cont\u00e9m uma estrutura de fenol impedido e, nos materiais polim\u00e9ricos, apresenta alta resist\u00eancia ao oxig\u00eanio e ao calor. Normalmente, o antioxidante de tiobisfenol \u00e9 dividido no tipo principal de antioxidante de fenol impedido.
\n(4) Passivador de \u00edons met\u00e1licos
\nOs passivadores de \u00edons met\u00e1licos cont\u00eam hidrazida, oxima e condensado de alde\u00eddo-amina e outros grupos de coordena\u00e7\u00e3o, complexa\u00e7\u00e3o de \u00edons met\u00e1licos. O produto mais representativo \u00e9 o 1024, que \u00e9 um composto do tipo dihidrazida e tamb\u00e9m cont\u00e9m um grupo funcional de fenol impedido combinado, o que confere ao produto resist\u00eancia ao cobre e resist\u00eancia ao envelhecimento por calor e oxig\u00eanio.
\n(5) Antioxidantes de aminas arom\u00e1ticas
\nOs antioxidantes de amina arom\u00e1tica s\u00e3o gerados pela condensa\u00e7\u00e3o de aminofenol ou hidroquinona com anilina. Esse tipo de produto tem cor mais escura, \u00e9 um antioxidante poluente, e a maioria dos produtos tem um certo grau de toxicidade, um grande n\u00famero de produtos de borracha e outros materiais polim\u00e9ricos s\u00e3o menos utilizados, e esse tipo de antioxidante tamb\u00e9m \u00e9 conhecido como antioxidante.<\/p>\n

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(1) Phenolic antioxidants Phenolic antioxidants are the most widely used and most abundant antioxidants in polymer materials. The phenolic hydroxyl group in phenolic antioxidants can release active hydrogen to capture the \u2018key offender\u2019 free…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[152],"tags":[],"class_list":["post-8639","post","type-post","status-publish","format-standard","hentry","category-antioxidant"],"yoast_head":"\nAntioxidants used in polymers - Changhong Chemical<\/title>\n<meta name=\"description\" content=\"(1) Phenolic antioxidants Phenolic antioxidants are the most widely used and most abundant antioxidants in polymer materials. 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