{"id":14452,"date":"2026-04-28T05:59:14","date_gmt":"2026-04-28T05:59:14","guid":{"rendered":"https:\/\/tenessy.com\/?p=14452"},"modified":"2026-04-28T05:59:15","modified_gmt":"2026-04-28T05:59:15","slug":"impact-of-hec-degree-of-substitution-ds-ms-on-paint-water-retention-and-open-time","status":"publish","type":"post","link":"https:\/\/tenessy.com\/fr\/impact-du-degre-de-substitution-hec-ds-ms-sur-la-retention-de-leau-et-le-temps-douverture-de-la-peinture\/","title":{"rendered":"Impact du degr\u00e9 de substitution des CHE (DS\/MS) sur la r\u00e9tention d'eau et le temps ouvert de la peinture"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"14452\" class=\"elementor elementor-14452\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fdbc6e4 e-flex e-con-boxed e-con e-parent\" data-id=\"fdbc6e4\" data-element_type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-20af60d elementor-widget elementor-widget-image\" data-id=\"20af60d\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/tenessy.com\/wp-content\/uploads\/2024\/09\/can-of-white-paint-with-paint-brush-over-grey-background-shallow-depth-of-field-effect-1024x682.jpg\" class=\"attachment-large size-large wp-image-5992\" alt=\"peinture\" srcset=\"https:\/\/tenessy.com\/wp-content\/uploads\/2024\/09\/can-of-white-paint-with-paint-brush-over-grey-background-shallow-depth-of-field-effect-1024x682.jpg 1024w, https:\/\/tenessy.com\/wp-content\/uploads\/2024\/09\/can-of-white-paint-with-paint-brush-over-grey-background-shallow-depth-of-field-effect-300x200.jpg 300w, https:\/\/tenessy.com\/wp-content\/uploads\/2024\/09\/can-of-white-paint-with-paint-brush-over-grey-background-shallow-depth-of-field-effect-768x512.jpg 768w, https:\/\/tenessy.com\/wp-content\/uploads\/2024\/09\/can-of-white-paint-with-paint-brush-over-grey-background-shallow-depth-of-field-effect-1536x1024.jpg 1536w, https:\/\/tenessy.com\/wp-content\/uploads\/2024\/09\/can-of-white-paint-with-paint-brush-over-grey-background-shallow-depth-of-field-effect.jpg 2000w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5ae54ec elementor-widget elementor-widget-text-editor\" data-id=\"5ae54ec\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">Dans la conception de la formulation des peintures, <a href=\"https:\/\/tenessy.com\/products\/hec-hydroxyethyl-cellulose\/\">Hydroxy\u00e9thylcellulose (HEC)<\/a> est l'un des modificateurs de rh\u00e9ologie et des agents de r\u00e9tention d'eau les plus couramment utilis\u00e9s. Cependant, de nombreux formulateurs se concentrent souvent uniquement sur la viscosit\u00e9 et la marque, n\u00e9gligeant ainsi deux param\u00e8tres techniques critiques - la viscosit\u00e9 et la marque - et la r\u00e9tention d'eau.\u00a0<strong>Degr\u00e9 de substitution (DS)<\/strong>\u00a0et\u00a0<strong>Substitution molaire (MS)<\/strong>. En effet, ces param\u00e8tres ont une incidence directe sur la qualit\u00e9 de la peinture.\u00a0<strong>r\u00e9tention d'eau, temps d'ouverture, maniabilit\u00e9 et qualit\u00e9 de la formation du film<\/strong>.<\/p><p class=\"ds-markdown-paragraph\">Cet article part de la structure mol\u00e9culaire et combine des sc\u00e9narios d'application pratique pour analyser l'influence de la DS et de la MS sur la performance des CHE. <a href=\"https:\/\/tenessy.com\/applications\/painting-coatings-solutions\/hec-for-paints-coatings\/\">dans les syst\u00e8mes de peinture<\/a>qui propose des conseils de s\u00e9lection fond\u00e9s sur des donn\u00e9es scientifiques.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bbece77 elementor-widget elementor-widget-heading\" data-id=\"bbece77\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">I.  Qu'est-ce que la DS et la MS dans le CHE ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1d6e955 elementor-widget elementor-widget-image\" data-id=\"1d6e955\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"534\" src=\"https:\/\/tenessy.com\/wp-content\/uploads\/2025\/08\/HEC-Product-1024x683.jpg\" class=\"attachment-large size-large wp-image-12799\" alt=\"Produit HEC\" srcset=\"https:\/\/tenessy.com\/wp-content\/uploads\/2025\/08\/HEC-Product-1024x683.jpg 1024w, https:\/\/tenessy.com\/wp-content\/uploads\/2025\/08\/HEC-Product-300x200.jpg 300w, https:\/\/tenessy.com\/wp-content\/uploads\/2025\/08\/HEC-Product-768x512.jpg 768w, https:\/\/tenessy.com\/wp-content\/uploads\/2025\/08\/HEC-Product-1536x1024.jpg 1536w, https:\/\/tenessy.com\/wp-content\/uploads\/2025\/08\/HEC-Product-2048x1365.jpg 2048w, https:\/\/tenessy.com\/wp-content\/uploads\/2025\/08\/HEC-Product-18x12.jpg 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-68887be elementor-widget elementor-widget-heading\" data-id=\"68887be\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1.1 Degr\u00e9 de substitution (DS)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d7524a3 elementor-widget elementor-widget-text-editor\" data-id=\"d7524a3\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><strong>DS<\/strong>\u00a0d\u00e9signe le nombre moyen de groupes hydroxyles substitu\u00e9s par unit\u00e9 de glucose sur la cha\u00eene de cellulose. Chaque unit\u00e9 de glucose poss\u00e8de trois groupes hydroxyles r\u00e9actifs, de sorte que le DS maximal th\u00e9orique est de 3.<\/p><ul><li><p class=\"ds-markdown-paragraph\"><strong>DS sup\u00e9rieur<\/strong>\u00a0\u2192 caract\u00e8re non ionique plus marqu\u00e9 du HEC, moins sensible aux sels et aux changements de pH.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>Gamme DS typique pour les HEC de qualit\u00e9 peinture<\/strong>: 1,0-2,5, la plupart des qualit\u00e9s de peinture se situant entre 1,5-2,2.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8d3dbef elementor-widget elementor-widget-heading\" data-id=\"8d3dbef\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1.2 Substitution molaire (MS)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a1ef794 elementor-widget elementor-widget-text-editor\" data-id=\"a1ef794\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><strong>MS<\/strong>\u00a0est le nombre moyen de moles de groupes hydroxy\u00e9thyles substitu\u00e9s par unit\u00e9 de glucose. \u00c9tant donn\u00e9 que les groupes hydroxy\u00e9thyles peuvent subir une\u00a0<strong>nouvelle \u00e9th\u00e9rification<\/strong>\u00a0(formant des cha\u00eenes lat\u00e9rales en forme de cha\u00eene), la MS peut d\u00e9passer 3.<\/p><ul><li><p class=\"ds-markdown-paragraph\"><strong>EM sup\u00e9rieur<\/strong>\u00a0\u2192 hydrophilie et r\u00e9tention d'eau plus fortes, mais la structure de la solution est plus affect\u00e9e.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>Gamme MS typique pour les HEC de qualit\u00e9 peinture<\/strong>: 1.8-3.5.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9f709a6 elementor-widget elementor-widget-heading\" data-id=\"9f709a6\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Compr\u00e9hension simplifi\u00e9e :<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f90c21c elementor-widget elementor-widget-text-editor\" data-id=\"f90c21c\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><p class=\"ds-markdown-paragraph\">DS d\u00e9termine la \"densit\u00e9 de substitution\" des CHE.<\/p><\/li><li><p class=\"ds-markdown-paragraph\">La SM d\u00e9termine la \"longueur de la cha\u00eene lat\u00e9rale et le degr\u00e9 d'hydrophilie\".<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0c8fd91 elementor-widget elementor-widget-heading\" data-id=\"0c8fd91\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">II.  Comment le degr\u00e9 de substitution affecte-t-il la r\u00e9tention d'eau des peintures ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a0d139 elementor-widget elementor-widget-heading\" data-id=\"4a0d139\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2.1 L'essence de la r\u00e9tention d'eau<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c7729ed elementor-widget elementor-widget-text-editor\" data-id=\"c7729ed\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">La r\u00e9tention d'eau fait r\u00e9f\u00e9rence \u00e0 la capacit\u00e9 des HEC \u00e0 bloquer les mol\u00e9cules d'eau par des liaisons hydrog\u00e8ne apr\u00e8s application sur des substrats poreux (par exemple, plaques de pl\u00e2tre, b\u00e9ton, bois), ralentissant ainsi la p\u00e9n\u00e9tration de l'eau dans le substrat ou l'\u00e9vaporation. Une mauvaise r\u00e9tention d'eau entra\u00eene :<\/p><ul><li><p class=\"ds-markdown-paragraph\">S\u00e9chage rapide des bords et des coins<\/p><\/li><li><p class=\"ds-markdown-paragraph\">Marques de chevauchement visibles<\/p><\/li><li><p class=\"ds-markdown-paragraph\">Formation d'un film discontinu<\/p><\/li><li><p class=\"ds-markdown-paragraph\">Mauvaise fixation des pigments<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0506129 elementor-widget elementor-widget-heading\" data-id=\"0506129\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2.2 Effet de la DS sur la r\u00e9tention d'eau<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a4bdde9 elementor-widget elementor-widget-text-editor\" data-id=\"a4bdde9\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within _1210dd7 c03cafe9\"><table><thead><tr><th>Niveau DS<\/th><th>Effet sur la r\u00e9tention d'eau<\/th><\/tr><\/thead><tbody><tr><td>DS faible (&lt;1,5)<\/td><td>Solubilit\u00e9 r\u00e9duite dans l'eau, faible r\u00e9tention d'eau, tendance \u00e0 la floculation ou \u00e0 la pr\u00e9cipitation<\/td><\/tr><tr><td>DS moyen (1,5-2,2)<\/td><td>Meilleure r\u00e9tention d'eau, \u00e9quilibrant la solubilit\u00e9 et la force de liaison hydrog\u00e8ne<\/td><\/tr><tr><td>DS \u00e9lev\u00e9 (&gt;2,5)<\/td><td>Hydrophilie \u00e9lev\u00e9e mais rigidit\u00e9 structurelle plus faible, efficacit\u00e9 de r\u00e9tention d'eau l\u00e9g\u00e8rement r\u00e9duite<\/td><\/tr><\/tbody><\/table><\/div><p class=\"ds-markdown-paragraph\"><strong>Point cl\u00e9<\/strong>: Un indice de viscosit\u00e9 plus \u00e9lev\u00e9 n'est pas toujours meilleur. Le DS optimal pour la plupart des peintures se situe entre 1,8 et 2,0, ce qui permet de former une couche d'hydratation stable.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-00775b3 elementor-widget elementor-widget-heading\" data-id=\"00775b3\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2.3 Effet de la SM sur la r\u00e9tention d'eau<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-77e4b92 elementor-widget elementor-widget-text-editor\" data-id=\"77e4b92\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">La MS affecte principalement la \"capacit\u00e9 d'hydratation\" des cha\u00eenes lat\u00e9rales. Une MS \u00e9lev\u00e9e signifie que les cha\u00eenes lat\u00e9rales sont plus longues et qu'il y a plus de sites de liaison hydrog\u00e8ne, ce qui am\u00e9liore la capacit\u00e9 d'hydratation.\u00a0<strong>r\u00e9tention d'eau instantan\u00e9e<\/strong>.<\/p><ul><li><p class=\"ds-markdown-paragraph\"><strong>MS \u00e9lev\u00e9 (&gt;3,0)<\/strong>: Forte r\u00e9tention d'eau, notamment en cas de temp\u00e9rature \u00e9lev\u00e9e et de faible humidit\u00e9 - id\u00e9al pour\u00a0<strong>construction d'\u00e9t\u00e9<\/strong>\u00a0ou\u00a0<strong>climats secs<\/strong>.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>Faible SEP (&lt;2,0)<\/strong>: R\u00e9tention d'eau mod\u00e9r\u00e9e, tendance au s\u00e9chage rapide des bords.<\/p><\/li><\/ul><p class=\"ds-markdown-paragraph\">Exemple de cas : Pour une viscosit\u00e9 et un dosage identiques, l'augmentation du MS de 2,0 \u00e0 3,2 prolonge le temps ouvert d'environ 15-25%.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9b2cd0b e-flex e-con-boxed e-con e-parent\" data-id=\"9b2cd0b\" data-element_type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-47b4288 elementor-widget elementor-widget-heading\" data-id=\"47b4288\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">III. La dur\u00e9e d'ouverture : un facteur d\u00e9terminant de la fen\u00eatre d'ouvrabilit\u00e9<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9fdf935 elementor-widget elementor-widget-heading\" data-id=\"9fdf935\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3.1 Qu'est-ce que l'Open Time ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bdbd11f elementor-widget elementor-widget-text-editor\" data-id=\"bdbd11f\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">Le temps ouvert est la p\u00e9riode qui suit l'application de la peinture et au cours de laquelle il est encore possible d'effectuer des corrections, un rodage ou un texturage. L'allongement du temps ouvert est particuli\u00e8rement important pour les peintures au latex de qualit\u00e9 sup\u00e9rieure et les rev\u00eatements textur\u00e9s.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba9f0a0 elementor-widget elementor-widget-heading\" data-id=\"ba9f0a0\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3.2 Comment le CEH r\u00e9gule le temps ouvert via DS\/MS<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-01f881f elementor-widget elementor-widget-text-editor\" data-id=\"01f881f\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">Le temps ouvert est \u00e9troitement li\u00e9 \u00e0 la r\u00e9tention d'eau, mais il n'est pas identique. Il s'agit \u00e9galement de la capacit\u00e9 \u00e0\u00a0<strong>retarder le d\u00e9pouillement de la surface<\/strong>.<\/p><ul><li><p class=\"ds-markdown-paragraph\"><strong>Faible DS + Faible MS<\/strong>: Lib\u00e9ration rapide de l'eau, temps d'ouverture court (&lt;5 min), convient uniquement aux syst\u00e8mes \u00e0 s\u00e9chage rapide.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>DS moyen + EM moyen-\u00e9lev\u00e9<\/strong>: Combinaison id\u00e9ale, temps ouvert de 10-20 min, convient \u00e0 la plupart des peintures int\u00e9rieures et ext\u00e9rieures.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>DS \u00e9lev\u00e9 + MS \u00e9lev\u00e9<\/strong>: Temps d'ouverture tr\u00e8s long (&gt;25 min) mais peut entra\u00eener un collage du rouleau, un s\u00e9chage lent et des probl\u00e8mes de r\u00e9sistance au blocage - n\u00e9cessite des coadjuvants.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8693a8e elementor-widget elementor-widget-heading\" data-id=\"8693a8e\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3.3 Observations exp\u00e9rimentales de la scl\u00e9rose en plaques en fonction du temps d'ouverture<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1752857 elementor-widget elementor-widget-text-editor\" data-id=\"1752857\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">R\u00e9sultats d'essais typiques (25\u00b0C, 50% RH) :<\/p><ul><li><p class=\"ds-markdown-paragraph\">HEC A (MS=2.2) : temps d'ouverture \u2248 12 min<\/p><\/li><li><p class=\"ds-markdown-paragraph\">HEC B (MS=3.1) : temps ouvert \u2248 17 min<\/p><\/li><li><p class=\"ds-markdown-paragraph\">HEC C (MS=3.8) : temps ouvert \u2248 24 min (mais baisse notable de la thixotropie)<\/p><\/li><\/ul><p class=\"ds-markdown-paragraph\">Conclusion : Chaque augmentation de 0,5 de la scl\u00e9rose en plaques allonge la dur\u00e9e d'ouverture d'environ 20-30%, mais le rapport co\u00fbt-efficacit\u00e9 diminue de mani\u00e8re significative au-del\u00e0 de 3,5.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-83ea234 elementor-widget elementor-widget-heading\" data-id=\"83ea234\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">IV. Effets secondaires de la DS\/MS sur d'autres propri\u00e9t\u00e9s essentielles<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3712386 elementor-widget elementor-widget-text-editor\" data-id=\"3712386\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within _1210dd7 c03cafe9\"><table><thead><tr><th>Propri\u00e9t\u00e9<\/th><th>Faible DS<\/th><th>Medium DS (recommand\u00e9)<\/th><th>Haut MS<\/th><\/tr><\/thead><tbody><tr><td>Tol\u00e9rance au sel<\/td><td>Pauvre<\/td><td>Bon<\/td><td>Mod\u00e9r\u00e9<\/td><\/tr><tr><td>Stabilit\u00e9 du pH<\/td><td>Pauvre<\/td><td>Stable<\/td><td>Stable<\/td><\/tr><tr><td>Vitesse de dissolution<\/td><td>Lenteur<\/td><td>Rapide<\/td><td>Rapide (mais susceptible de s'agglom\u00e9rer)<\/td><\/tr><tr><td>Biostabilit\u00e9<\/td><td>Mod\u00e9r\u00e9<\/td><td>Bon<\/td><td>M\u00e9diocre (cha\u00eenes lat\u00e9rales sensibles aux enzymes)<\/td><\/tr><tr><td>R\u00e9sistance \u00e0 l'affaissement<\/td><td>Mod\u00e9r\u00e9<\/td><td>Bon<\/td><td>L\u00e9g\u00e8rement r\u00e9duit<\/td><\/tr><\/tbody><\/table><\/div><p class=\"ds-markdown-paragraph\">Note : Le HEC \u00e0 haute teneur en MS est plus sensible \u00e0 la d\u00e9gradation par la cellulase. Des conservateurs sont n\u00e9cessaires pour le stockage \u00e0 long terme ou lors de la formulation avec certains biopolym\u00e8res.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a3f4944 elementor-widget elementor-widget-heading\" data-id=\"a3f4944\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">V. Comment choisir le bon DS\/MS pour votre syst\u00e8me de peinture ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8fce879 elementor-widget elementor-widget-text-editor\" data-id=\"8fce879\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3>Tableau de s\u00e9lection recommand\u00e9 (TENESSY)<\/h3><div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within _1210dd7 c03cafe9\"><table><thead><tr><th>Type de peinture<\/th><th>DS recommand\u00e9<\/th><th>Recommand\u00e9 MS<\/th><th>Raison<\/th><\/tr><\/thead><tbody><tr><td>Peinture int\u00e9rieure mate au latex<\/td><td>1.8-2.0<\/td><td>2.2-2.8<\/td><td>Temps d'ouverture et r\u00e9sistance aux \u00e9claboussures \u00e9quilibr\u00e9s<\/td><\/tr><tr><td>Peinture \u00e9lastom\u00e8re ext\u00e9rieure<\/td><td>2.0-2.2<\/td><td>2.8-3.2<\/td><td>Haute r\u00e9tention d'eau, r\u00e9siste aux conditions chaudes et s\u00e8ches<\/td><\/tr><tr><td>Peinture de texture \/ rev\u00eatement de pierre<\/td><td>1.6-1.9<\/td><td>2.0-2.5<\/td><td>Contr\u00f4le l'affaissement, s\u00e9chage mod\u00e9r\u00e9<\/td><\/tr><tr><td>Peinture industrielle \u00e0 l'eau<\/td><td>&gt;2.0<\/td><td>2.2-2.8<\/td><td>R\u00e9sistance au sel et \u00e0 l'\u00e9lectrolyte<\/td><\/tr><tr><td>Peinture \u00e0 sec<\/td><td>1.8-2.0<\/td><td>2.5-3.0<\/td><td>Hydratation rapide, viscosit\u00e9 de m\u00e9lange stable<\/td><\/tr><\/tbody><\/table><\/div><p class=\"ds-markdown-paragraph\">Remarque : il s'agit de fourchettes typiques. Ajuster en coordination avec le syst\u00e8me rh\u00e9ologique global (par exemple, HEUR, HASE) si n\u00e9cessaire.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9cf3064 elementor-widget elementor-widget-heading\" data-id=\"9cf3064\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\u2165. Id\u00e9es re\u00e7ues et conseils de formulation<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1640c9f elementor-widget elementor-widget-heading\" data-id=\"1640c9f\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">\u274c Id\u00e9e re\u00e7ue 1 : Une SEP plus \u00e9lev\u00e9e est toujours meilleure<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d55bd9a elementor-widget elementor-widget-text-editor\" data-id=\"d55bd9a\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">R\u00e9alit\u00e9 : Une scl\u00e9rose en plaques trop \u00e9lev\u00e9e peut \u00eatre \u00e0 l'origine de :<\/p><ul><li class=\"ds-markdown-paragraph\">Surface collante<\/li><li class=\"ds-markdown-paragraph\">R\u00e9duction de la r\u00e9sistance au frottement<\/li><li class=\"ds-markdown-paragraph\">Faible biostabilit\u00e9<\/li><li>Co\u00fbt inutilement \u00e9lev\u00e9<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-50daeaa elementor-widget elementor-widget-heading\" data-id=\"50daeaa\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">\u274c Id\u00e9e re\u00e7ue 2 : le DS n'a pas d'impact significatif sur le syst\u00e8me<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-43231fd elementor-widget elementor-widget-text-editor\" data-id=\"43231fd\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><p class=\"ds-markdown-paragraph\">R\u00e9alit\u00e9 : La DS affecte directement le comportement de dissolution et la tol\u00e9rance aux sels des CHE dans l'eau, en particulier dans les syst\u00e8mes \u00e0 forte teneur en PVC ou contenant des \u00e9lectrolytes.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d6b046c elementor-widget elementor-widget-heading\" data-id=\"d6b046c\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Recommandations :<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bacec33 elementor-widget elementor-widget-text-editor\" data-id=\"bacec33\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ol start=\"1\"><li><p class=\"ds-markdown-paragraph\"><strong>D\u00e9terminer la teneur en sel et la plage de pH de votre syst\u00e8me de peinture<\/strong>\u00a0\u2192 Choisir le DS minimum.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>En fonction de l'environnement de l'application (temp\u00e9rature\/humidit\u00e9) et des exigences en mati\u00e8re de temps d'ouverture<\/strong>\u00a0\u2192 S\u00e9lection de la plage MS.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>Test \u00e0 petite \u00e9chelle<\/strong>: Observer la vitesse de dissolution du HEC et la pr\u00e9sence de particules de gel pendant le m\u00e9lange.<\/p><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a784bf elementor-widget elementor-widget-heading\" data-id=\"9a784bf\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bcd3898 elementor-widget elementor-widget-text-editor\" data-id=\"bcd3898\" data-element_type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\">Le DS et le MS de HEC ne sont pas \"plus haut, c'est mieux\" ou \"plus bas, c'est mieux\" - ils sont\u00a0<strong>une question d'ad\u00e9quation entre les besoins de formulation<\/strong>.<\/p><ul><li><p class=\"ds-markdown-paragraph\"><strong>DS<\/strong>\u00a0d\u00e9termine la stabilit\u00e9 de l'\u00e9pine dorsale et la robustesse du syst\u00e8me.<\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong>MS<\/strong>\u00a0d\u00e9termine l'hydrophilie et le temps d'ouverture.<\/p><\/li><\/ul><p class=\"ds-markdown-paragraph\">Les exigences en mati\u00e8re de performance des peintures \u00e9tant de plus en plus strictes, la compr\u00e9hension et la s\u00e9lection correcte des param\u00e8tres DS\/MS constituent une \u00e9tape importante pour am\u00e9liorer la comp\u00e9titivit\u00e9 des produits et r\u00e9duire les co\u00fbts de formulation.<\/p><p class=\"ds-markdown-paragraph\">Pour obtenir des \u00e9chantillons ou une assistance technique, veuillez consulter la page\u00a0<a href=\"https:\/\/tenessy.com\/\"><strong>Site officiel de TENESSY<\/strong><\/a>\u00a0et <a href=\"https:\/\/tenessy.com\/contact\/\">contactez notre \u00e9quipe de technologie d'application de la peinture<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Dans la formulation des peintures, l'hydroxy\u00e9thylcellulose (HEC) est l'un des modificateurs rh\u00e9ologiques et des agents de r\u00e9tention d'eau les plus couramment utilis\u00e9s.<\/p>","protected":false},"author":1,"featured_media":5992,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[35],"tags":[],"class_list":["post-14452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - 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