{"id":3014,"date":"2020-08-24T07:41:55","date_gmt":"2020-08-24T07:41:55","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=3014"},"modified":"2020-09-30T02:38:40","modified_gmt":"2020-09-30T02:38:40","slug":"why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/","title":{"rendered":"Pourquoi l'agent blanchissant fluorescent para\u00eet-il jaune et quelle est la solution ?"},"content":{"rendered":"

Afin d'am\u00e9liorer la blancheur de la production, nous voulons augmenter la quantit\u00e9 d'agent de blanchiment pour atteindre l'objectif, mais le r\u00e9sultat n'est pas blanc mais jaunit le tissu, en v\u00e9rifiant les donn\u00e9es et en analysant les raisons, apr\u00e8s de nombreuses exp\u00e9riences, nous avons trouv\u00e9 le point de jaunissement et la solution.<\/h4>\n\n\n\n

1\u3001 Principe de l'agent blanchissant fluorescent<\/strong><\/h2>\n\n\n\n

Il existe une grande vari\u00e9t\u00e9 d'agents de blanchiment fluorescents, le blanchiment de diff\u00e9rentes fibres n\u00e9cessite diff\u00e9rentes marques d'agents de blanchiment, bien que la structure chimique et les propri\u00e9t\u00e9s des diff\u00e9rents agents de blanchiment soient diff\u00e9rentes, le principe de blanchiment de la fibre ou du tissu est le m\u00eame. Le principe du blanchiment est principalement d\u00fb aux mol\u00e9cules de l'agent de blanchiment qui contiennent un syst\u00e8me de double liaison conjugu\u00e9e, une bonne plan\u00e9it\u00e9, la structure mol\u00e9culaire sp\u00e9ciale sous la lumi\u00e8re du soleil peut absorber la lumi\u00e8re du soleil, la lumi\u00e8re ultraviolette (longueur d'onde de 300 ~ 400nm) et la lumi\u00e8re violette (longueur d'onde de 420 ~ 500nm), ou la lumi\u00e8re violette et la fibre m\u00e9lang\u00e9e \u00e0 la lumi\u00e8re jaune sur le tissu dans une lumi\u00e8re blanche, ainsi la fibre ou le tissu devient visiblement blanc.<\/h4>\n\n\n\n

2 \u3001 La raison pour laquelle la blancheur diminue<\/strong><\/h2>\n\n\n\n

(1) L'intensit\u00e9 de la lumi\u00e8re jaune sur le tissu \u00e9tant limit\u00e9e, la lumi\u00e8re de couleur compl\u00e9mentaire - bleue et violette - \u00e9mise par l'agent de blanchiment fluorescent absorbant la lumi\u00e8re ultraviolette est \u00e9galement limit\u00e9e pour compenser la lumi\u00e8re jaune (la longueur d'onde principale est d'environ 570 nm).<\/h4>\n\n\n\n

(2) L'effet blanchissant de l'azurant fluorescent n'est qu'un \u00e9claircissement optique et un compl\u00e9ment, et ne peut pas remplacer le blanchiment chimique. Par cons\u00e9quent, l'effet blanchissant de l'azurant fluorescent n'est pas id\u00e9al pour les tissus non blanchis.<\/h4>\n\n\n\n

(3) Selon le principe de l'agent blanchissant fluorescent, l'effet blanchissant de l'agent blanchissant d\u00e9pend principalement de la teneur en UV de la lumi\u00e8re du soleil et de la concentration de l'agent blanchissant fluorescent sur la fibre ou le tissu. Lorsque la teneur en UV est suffisante, la concentration de l'agent blanchissant fluorescent sur le tissu change dans une certaine plage, et l'effet blanchissant augmente avec l'augmentation de la concentration de l'agent blanchissant sur le tissu, et l'intensit\u00e9 de la lumi\u00e8re bleue violette augmente \u00e9galement, de mani\u00e8re \u00e0 compenser une partie de la lumi\u00e8re jaune sur le tissu, et le tissu devient de plus en plus blanc.Lorsque la concentration de l'agent blanchissant augmente jusqu'\u00e0 une certaine concentration appropri\u00e9e, l'intensit\u00e9 de la lumi\u00e8re bleue violette qu'il \u00e9met est exactement la m\u00eame que l'intensit\u00e9 de la lumi\u00e8re jaune sur le tissu, qui s'annule exactement, et l'effet de blanchiment est le meilleur, et la valeur de la blancheur est la plus \u00e9lev\u00e9e.Mais si l'on augmente le dosage de l'agent blanc au-del\u00e0 de la concentration optimale, le tissu absorbe l'intensit\u00e9 de la lumi\u00e8re violette et compense l'intensit\u00e9 de la lumi\u00e8re jaune, l'agent de blanchiment bleu-violet r\u00e9fl\u00e9chi par le tissu est \u00e9vident, en m\u00eame temps, en raison de l'augmentation de toutes sortes de groupes d'agents blancs, les diff\u00e9rentes nuances du rendu (comme le vert, le violet, le rouge, le bleu, etc.) sont clairement visibles, le r\u00e9sultat de l'action combin\u00e9e des facteurs ci-dessus, l'augmentation du tissu gris, sa blancheur diminue par la suite.<\/h4>\n\n\n\n

(4) Lorsqu'il y a de l'acide ou du chlore gazeux dans les lieux de stockage du tissu blanchi, la teneur en humidit\u00e9 est \u00e9lev\u00e9e, il est facile d'absorber l'eau, car l'eau est liquide, sous l'attraction mol\u00e9culaire des groupes hydrophiles, elle a tendance \u00e0 \u00e9quilibrer la reprise d'humidit\u00e9 de la couverture du tissu, c'est la raison pour laquelle le tissu jaunit et s'\u00e9tend en morceaux, le tissu se tache par points et saigne dans les couches sup\u00e9rieures et inf\u00e9rieures des tissus.<\/h4>\n\n\n\n

(5) Une qualit\u00e9 d'eau impure, une duret\u00e9 \u00e9lev\u00e9e de l'eau ou des m\u00e9taux lourds peuvent affecter l'effet de blanchiment.<\/h4>\n\n\n\n

3\u3001 Les taches jaunes de l'agent blanchissant<\/strong><\/h2>\n\n\n\n

La concentration optimale de l'agent de blanchiment est appel\u00e9e le point de jaunissement de l'agent de blanchiment.Les points de jaunissement de divers agents de blanchiment fluorescents sont diff\u00e9rents.Par exemple, le point de jaunissement de l'agent de blanchiment fluorescent DT (utilis\u00e9 pour le polyester) est de 0,8%, c'est-\u00e0-dire que lorsque la quantit\u00e9 de l'agent de blanchiment DT d\u00e9passe 0,8%, sa valeur de blancheur diminue avec l'augmentation de la quantit\u00e9.Le point de jaunissement de l'agent de blanchiment fluorescent VBL (utilis\u00e9 pour les tissus en coton pur) est de 0,5 %.Le point de jaunissement de l'agent de blanchiment fluorescent DCB (utilis\u00e9 pour blanchir les fibres acryliques) est de 0,8%.Le point de jaunissement de l'agent de blanchiment fluorescent CH (utilis\u00e9 pour les fils acryliques gonfl\u00e9s) est de 3,3 %. BlankophorBBU (liquide, produits Bayer, pour les tissus en coton pur) avait un point de jaunissement de 1,26% ; Uvite ERN - P (un produit de la soci\u00e9t\u00e9 CGY utilis\u00e9 dans les tissus en polyester) a un point de jaunissement de 0,8% ; Uvite EBF 250 %C pulpe MCGY produits, utilis\u00e9s dans les tissus en polyester) point de jaunissement de 3 %.<\/h4>\n\n\n\n

4\u3001 Solutions<\/strong><\/h2>\n\n\n\n

(1) Une s\u00e9rie de mesures correspondantes doivent \u00eatre prises dans le processus de production, telles que dans le processus d'\u00e9bullition et de blanchiment, le lavage apr\u00e8s le d\u00e9capage doit \u00eatre suffisant ; le savonnage pour minimiser les r\u00e9sidus de savon ; l'eau douce doit \u00eatre utilis\u00e9e pour le blanchiment et la valeur pH doit \u00eatre alcaline (pH8~9).L'agent de blanchiment fluorescent doit choisir des produits ayant une bonne r\u00e9sistance aux acides, tels que Uvitex RT, CF, BT (ciba -jiagi company) ; Tinopal2B, SP (ciba -jiaggi), Leucophor B (sandex) ; BlankophorBBU (Bayer, inc.), et ainsi de suite.<\/h4>\n\n\n\n

(2) Le processus traditionnel est le suivant : r\u00e9curage et blanchiment - lavage \u00e0 l'eau chaude - acide - d\u00e9soxydation - lavage \u00e0 l'eau.l'acide ac\u00e9tique glacial a \u00e9t\u00e9 lav\u00e9 apr\u00e8s l'eau chaude.l'acide ac\u00e9tique glacial est un acide volatil, peu perm\u00e9able, qui ne peut neutraliser la soude caustique qu'\u00e0 la surface de la fibre, mais qui a du mal \u00e0 p\u00e9n\u00e9trer \u00e0 l'int\u00e9rieur de la fibre.Par cons\u00e9quent, l'acide neutralisant peut non seulement neutraliser la soude caustique \u00e0 la surface de la fibre, mais aussi neutraliser la soude caustique \u00e0 l'int\u00e9rieur de la fibre, de sorte que l'effet de neutralisation compl\u00e8te peut \u00eatre atteint. Entre-temps, la dur\u00e9e et la temp\u00e9rature de la suracidit\u00e9 doivent \u00eatre strictement contr\u00f4l\u00e9es afin d'obtenir une neutralisation compl\u00e8te. Ceci est particuli\u00e8rement important pour le blanchiment des tissus lourds d'une masse de 190 g\/m2 ou plus.<\/h4>\n\n\n\n

(3) L'assouplissant cationique, l'assouplissant cationique faible et l'huile de silicone ordinaire peuvent provoquer diff\u00e9rents degr\u00e9s de jaunissement des tissus blancs.<\/h4>\n\n\n\n

(4) Le tissu doit \u00e9viter tout contact avec des acides ou des gaz tels que le chlore.<\/h4>\n\n\n\n

(5) Il convient d'utiliser de l'eau douce, car une duret\u00e9 \u00e9lev\u00e9e de l'eau diminue l'effet de blanchiment. L'acide, le chlore libre et les ions de m\u00e9taux lourds tels que le cuivre et le fer pr\u00e9sents dans l'eau peuvent affecter de mani\u00e8re significative l'effet de blanchiment.<\/h4>\n\n\n\n

(6) Contr\u00f4ler le dosage de l'agent de blanchiment fluorescent.<\/h4>\n\n\n\n

<\/p>\n\n\n\n

Cet article a \u00e9t\u00e9 r\u00e9dig\u00e9 par Longchang Chemical R&D Department. Si vous souhaitez le copier et le r\u00e9imprimer, veuillez indiquer la source.<\/h4>\n\n\n\n

Voici les produits de la s\u00e9rie des azurants fluorescents vendus par notre soci\u00e9t\u00e9.<\/h4>\n\n\n\n
\u00c9claircisseur optique OB-1<\/a><\/td>1533-45-5<\/td><\/tr>
\u00c9claircisseur fluorescent OB<\/a><\/td>7128-64-5<\/td><\/tr>
\u00c9claircisseur fluorescent ER-II<\/a><\/td>13001-38-2<\/td><\/tr>
\u00c9claircisseur optique CBS-X<\/a><\/td>27344-41-8<\/td><\/tr>
\u00c9claircisseur optique FP-127<\/a><\/td>40470-68-6<\/td><\/tr>
Stabilisateur de lumi\u00e8re-944<\/a><\/td>70624-18-9<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

Afin d'am\u00e9liorer la blancheur de la production, nous voulons augmenter la quantit\u00e9 d'agent de blanchiment pour atteindre le but, mais le r\u00e9sultat n'est pas blanc mais le tissu jaunit, \u00e0 travers la v\u00e9rification des donn\u00e9es et l'analyse des raisons, apr\u00e8s de nombreuses exp\u00e9riences, nous avons trouv\u00e9 le point de jaunissement et la solution. 1\u3001 Principe de l'agent de blanchiment fluorescent [...]<\/p>","protected":false},"author":1,"featured_media":3016,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3014","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nWhy the fluorescent whitening agent looks yellow and the solution - 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-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why the fluorescent whitening agent looks yellow and the solution - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"In order to improve the whiteness of the production, we want to increase the amount of whitening agent to achieve the goal, but the result is not white but yellowing fabric, through checking the data and analyzing the reasons, after many experiments, we found the yellowing point and solution. 1\u3001 Principle of fluorescent whitening agent […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/longchangchemical.com\/fr\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/\" \/>\n<meta property=\"og:site_name\" content=\"Longchang Chemical\" \/>\n<meta property=\"article:published_time\" content=\"2020-08-24T07:41:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-09-30T02:38:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/08\/19.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"750\" \/>\n\t<meta property=\"og:image:height\" content=\"750\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Longchang Chemical\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/longchangchemical.com\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/longchangchemical.com\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/\"},\"author\":{\"name\":\"Longchang Chemical\",\"@id\":\"https:\/\/longchangchemical.com\/#\/schema\/person\/ecb1ad846136c6f1ca534b62978c6a8e\"},\"headline\":\"Why the fluorescent whitening agent looks yellow and the solution\",\"datePublished\":\"2020-08-24T07:41:55+00:00\",\"dateModified\":\"2020-09-30T02:38:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/longchangchemical.com\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/\"},\"wordCount\":1106,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/longchangchemical.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/longchangchemical.com\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/08\/19.jpg\",\"articleSection\":[\"Uncategorized\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/longchangchemical.com\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/longchangchemical.com\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/\",\"url\":\"https:\/\/longchangchemical.com\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/\",\"name\":\"Why the fluorescent whitening agent looks yellow and the solution - 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