{"id":160719,"date":"2024-10-31T16:43:16","date_gmt":"2024-10-31T14:43:16","guid":{"rendered":"https:\/\/concentrol.com\/?p=160719"},"modified":"2024-10-31T17:06:27","modified_gmt":"2024-10-31T15:06:27","slug":"amelioration-de-lhydrophobicite-des-revetements-a-base-deau-avec-des-additifs-demulsion-de-cire","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/fr\/amelioration-de-lhydrophobicite-des-revetements-a-base-deau-avec-des-additifs-demulsion-de-cire\/","title":{"rendered":"Am\u00e9lioration de l’hydrophobicit\u00e9 des rev\u00eatements \u00e0 base d’eau avec des additifs d’\u00e9mulsion de cire"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00a0\u00bb703790″]<\/p>\n

Une \u00e9mulsion est un syst\u00e8me biphas\u00e9 de liquides non miscibles. En fonction de la composition de la phase continue et de la phase dispers\u00e9e, on peut obtenir des \u00e9mulsions huile-dans-eau ou eau-dans-huile. L\u2019ajout d\u2019un tensioactif est essentiel pour stabiliser toutes les \u00e9mulsions, car il r\u00e9duit la tension interfaciale entre les deux liquides. D’autres additifs peuvent \u00e9galement \u00eatre utilis\u00e9s pour accro\u00eetre cette stabilit\u00e9.<\/p>\n

Les \u00e9mulsions de cire offrent un moyen efficace d\u2019incorporer de la cire dans un produit, puisqu’elles s\u2019int\u00e8grent facilement dans les formulations de rev\u00eatements et de peintures \u00e0 base d\u2019eau par simple m\u00e9lange, gr\u00e2ce \u00e0 leur forme liquide. Les cires sont des additifs courants qui influencent consid\u00e9rablement les propri\u00e9t\u00e9s de surface de tout rev\u00eatement, en am\u00e9liorant et en prot\u00e9geant son apparence.<\/p>\n

En raison de leur structure chimique, les cires conf\u00e8rent une am\u00e9lioration notable de la r\u00e9sistance \u00e0 l’eau. Comme son nom l\u2019indique, cette propri\u00e9t\u00e9 prot\u00e8ge une surface contre la p\u00e9n\u00e9tration de l’eau, qui peut provoquer des probl\u00e8mes de moisissure (insalubres et peu esth\u00e9tiques) et m\u00eame des dommages structurels irr\u00e9versibles.<\/p>\n

Les cires de paraffine offrent souvent une performance excellente, particuli\u00e8rement sur les surfaces poreuses, car elles sont principalement compos\u00e9es de cha\u00eenes d’alcane lin\u00e9aires et pr\u00e9sentent une bonne structure cristalline, fournissant ainsi d’excellents effets de barri\u00e8re contre l’eau.<\/p>\n

La gamme d\u2019\u00e9mulsions de cire EMULTROL comprend une vari\u00e9t\u00e9 de cires telles que paraffine, poly\u00e9thyl\u00e8ne, lignite, carnauba, entre autres. Combin\u00e9es avec diff\u00e9rents \u00e9mulsifiants, ces cires couvrent la majorit\u00e9 des besoins de nos clients. Parmi elles, les produits EMULTROL CM-2469 SPL et CM-2655 E se distinguent comme les candidats les plus efficaces pour am\u00e9liorer la r\u00e9sistance \u00e0 l\u2019eau des peintures \u00e0 base d’eau. Toutes deux sont des \u00e9mulsions de cire de paraffine, de couleur blanche, avec une taille de particule faible (< 1 \u00b5m), une faible viscosit\u00e9 et un pH alcalin (voir Figure 1 et Tableau 1).<\/p>\n

Figure 1<\/b> – Apparence de l\u2019EMULTROL CM-2469 SPL et CM-2655 E et leur distribution de taille de particules.<\/p>\n

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Tableau 1<\/b> – Propri\u00e9t\u00e9s de l\u2019EMULTROL CM-2469 SPL et CM-2655 E.<\/p>\n

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\u00c9tude<\/b><\/p>\n

L’analyse de l’interaction d’un liquide avec une surface peut fournir des indications pr\u00e9cieuses sur les caract\u00e9ristiques de cette surface et sur son comportement dans d’autres environnements connexes. L\u2019angle de contact d’une goutte d’eau est un indicateur cl\u00e9 de la modification de surface, r\u00e9v\u00e9lant si celle-ci a \u00e9t\u00e9 con\u00e7ue pour remplir des fonctions sp\u00e9cifiques via l’ajout de rev\u00eatements.<\/p>\n

Une goutte qui reste ronde, avec un angle de contact \u00e9lev\u00e9 (voir Figure 2, gauche), indique une surface hydrophobe ou r\u00e9pulsive \u00e0 l’eau. En revanche, une goutte qui s’\u00e9tale sur la surface (voir Figure 2, droite), r\u00e9v\u00e9lant un faible angle de contact, indique une surface hydrophile.<\/p>\n

Figure 2<\/b> – Surfaces rev\u00eatues (gauche) et non rev\u00eatues (droite) pour am\u00e9liorer l\u2019hydrophobicit\u00e9.<\/p>\n

\"\"<\/h5>\n

Pour \u00e9valuer le comportement hydrophobe de chaque produit, une couche de 30 \u00b5m (en \u00e9tat humide) de chaque \u00e9mulsion a \u00e9t\u00e9 appliqu\u00e9e sur du papier et laiss\u00e9e \u00e0 s\u00e9cher compl\u00e8tement (au moins 12 h \u00e0 temp\u00e9rature ambiante). Ensuite, une goutte d’eau a \u00e9t\u00e9 d\u00e9pos\u00e9e d\u00e9licatement sur cette couche pour observer sa forme.<\/p>\n

Pour d\u00e9montrer les avantages de l’utilisation des \u00e9mulsions de cire comme additifs dans les peintures, un ajout de 2 % et de 3 % de chaque \u00e9mulsion a \u00e9t\u00e9 fait \u00e0 deux r\u00e9sines commerciales diff\u00e9rentes, l’une styr\u00e8ne-acrylique et l’autre acrylique, toutes deux utilis\u00e9es dans les peintures et les rev\u00eatements. Les caract\u00e9ristiques de ces r\u00e9sines sont pr\u00e9sent\u00e9es dans le Tableau 2. Le m\u00eame proc\u00e9d\u00e9 d\u00e9crit pr\u00e9c\u00e9demment a \u00e9t\u00e9 appliqu\u00e9 en utilisant les r\u00e9sines modifi\u00e9es comme rev\u00eatement.<\/p>\n

Tableau 2<\/b> – Propri\u00e9t\u00e9s des r\u00e9sines.<\/p>\n

\"\"<\/p>\n

R\u00e9sultats<\/b><\/p>\n

Il est bien connu qu’un papier non rev\u00eatu s’imbibe imm\u00e9diatement lorsqu’il est expos\u00e9 \u00e0 l’eau. Cependant, en utilisant le rev\u00eatement appropri\u00e9, une surface hydrophobe peut \u00eatre obtenue. Dans la Figure 3, nous observons le comportement des gouttes d’eau sur le papier rev\u00eatu. Comme mentionn\u00e9 pr\u00e9c\u00e9demment, le caract\u00e8re hydrophobe est plus prononc\u00e9 avec les \u00e9mulsions de cire (a), en comparaison avec les r\u00e9sines purement acryliques (b), car une forme plus sph\u00e9rique est obtenue, ce qui implique un angle de contact plus \u00e9lev\u00e9.<\/p>\n

Figure 3<\/b> – Gouttes d’eau sur papier rev\u00eatu avec a) \u00e9mulsions de cire EMULTROL CM-2469 SPL et CM-2655 E et b) r\u00e9sine 1 et r\u00e9sine 2.<\/p>\n

\"\"<\/p>\n

De plus, dans la Figure 4, on observe une am\u00e9lioration de l\u2019hydrophobicit\u00e9 du rev\u00eatement lors de l\u2019utilisation d\u2019\u00e9mulsions de cire comme additifs dans les r\u00e9sines acryliques. Cet effet est plus accentu\u00e9 avec la r\u00e9sine 2 (b), o\u00f9 l\u2019on remarque une forme plus arrondie de la goutte d\u2019eau. Comme pr\u00e9vu, lorsque la concentration augmente de 2 % \u00e0 3 %, l\u2019hydrophobicit\u00e9 de la surface s\u2019am\u00e9liore (Figure 5).<\/p>\n

En conclusion, EMULTROL CM-2469 SPL et EMULTROL CM-2655 E sont d\u2019excellents candidats comme additifs d\u2019\u00e9mulsion de cire pour les peintures \u00e0 base d\u2019eau, en particulier celles formul\u00e9es avec des dispersions polym\u00e9riques.<\/p>\n

Figure 4<\/b> – Gouttes d’eau sur papier rev\u00eatu avec a) r\u00e9sine pure et additiv\u00e9e 1 et b) r\u00e9sine pure et additiv\u00e9e 2 \u00e0 2 % d’\u00e9mulsions de cire.<\/p>\n

\"\"<\/p>\n

Figure 5<\/b> – Gouttes d’eau sur papier rev\u00eatu avec a) r\u00e9sine 1 et b) r\u00e9sine 2 avec 2 % et 3 % d’\u00e9mulsions de cire respectivement.<\/p>\n

\"\"<\/p>\n

Conclusions<\/b><\/p>\n

EMULTROL CM-2469 SPL et EMULTROL CM-2655 E sont des \u00e9mulsions de cire de paraffine sp\u00e9cialement d\u00e9velopp\u00e9es pour les rev\u00eatements \u00e0 base d’eau. Elles sont formul\u00e9es avec des syst\u00e8mes \u00e9mulsifiants diff\u00e9rents qui augmentent la compatibilit\u00e9 avec les r\u00e9sines aqueuses communes. Le principal avantage de ces \u00e9mulsions de cire dans les rev\u00eatements \u00e0 base d’eau est l\u2019augmentation de l\u2019hydrophobicit\u00e9 du film. L\u2019efficacit\u00e9 de ces \u00e9mulsions est d\u00e9montr\u00e9e dans cette \u00e9tude.<\/p>\n

Il est important de noter que chaque formulation est unique et peut n\u00e9cessiter des tests de compatibilit\u00e9 pour assurer des r\u00e9sultats optimaux.<\/p>\n

AUTEUR: Carlota Claras\u00f3<\/h5>\n

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[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00a0\u00bb703790″] Une \u00e9mulsion est un syst\u00e8me biphas\u00e9 de liquides non miscibles. En fonction de la composition de la phase […]<\/p>\n","protected":false},"author":36,"featured_media":160714,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[105],"tags":[812,1148],"class_list":["post-160719","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-concentrol-fr","tag-wax-emulsion-fr"],"acf":[],"yoast_head":"\nAm\u00e9lioration de l'hydrophobicit\u00e9 des rev\u00eatements \u00e0 base d'eau avec des additifs d'\u00e9mulsion de cire - Concentrol<\/title>\n<meta name=\"description\" content=\"Silicone Stabilizers for HR Molded Foams. 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