{"id":2832,"date":"2026-04-10T09:29:35","date_gmt":"2026-04-10T09:29:35","guid":{"rendered":"https:\/\/www.seedchemever.com\/?p=2832"},"modified":"2026-04-10T09:29:39","modified_gmt":"2026-04-10T09:29:39","slug":"la-sfida-dei-rivestimenti-a-base-dacqua-su-substrati-di-pp-pe","status":"publish","type":"post","link":"https:\/\/www.seedchemever.com\/it\/the-challenge-of-waterborne-coatings-on-pp-pe-substrates\/","title":{"rendered":"La sfida dei rivestimenti all'acqua su substrati in PP e PE"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Today, let&#8217;s talk about a headache-inducing problem for many engineers: the persistent difficulty of achieving lasting adhesion when applying waterborne coatings to substrates like Polypropylene (PP) and Polyethylene (PE).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Con l'inasprirsi delle normative ambientali, i rivestimenti a base d'acqua vengono ampiamente adottati. Tuttavia, la loro applicazione su PP e PE presenta sfide significative. Come possiamo ottenere sistematicamente questa adesione a lungo termine?<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"800\" height=\"498\" data-src=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-1.jpg\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\" class=\"wp-image-2833 lazyload\"\/><noscript><img decoding=\"async\" width=\"800\" height=\"498\" src=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-1.jpg\" alt=\"\" class=\"wp-image-2833\" srcset=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-1.jpg 800w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-1-300x187.jpg 300w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-1-768x478.jpg 768w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-1-18x12.jpg 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Il conflitto intrinseco<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">First, let&#8217;s examine the surface characteristics of PP and PE and the troubles they cause:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bassa energia superficiale<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L'energia superficiale del PP e del PE \u00e8 molto bassa (solo 20-30 dynes), mentre la tensione superficiale dell'acqua \u00e8 molto pi\u00f9 alta. Questo fa s\u00ec che l'acqua si ammassi come su una foglia di loto, impedendo una corretta bagnatura. Senza una bagnatura di base, l'adesione \u00e8 impossibile.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Molecole non polari<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">These materials lack functional groups for the coating to &#8220;bite&#8221; onto. Their molecular chains are non-polar, and the surface structure is a mix of crystalline and amorphous regions, making it highly uneven.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Agenti distaccanti per stampi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">I coadiuvanti tecnologici, come i distaccanti, spesso migrano sulla superficie, formando una pellicola isolante. In questo modo il rivestimento scivola via facilmente come se fosse su vetro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fondamentalmente, si tratta di uno scontro tra un substrato con bassa energia superficiale e nessuna reattivit\u00e0 e un sistema a base d'acqua con elevata tensione superficiale, sensibile alle condizioni ambientali. Non si tratta solo di un problema di materiali, ma di un problema sistemico che coinvolge il trattamento della superficie, la progettazione della formulazione e l'ambiente di costruzione.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"800\" height=\"519\" data-src=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-2.jpg\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\" class=\"wp-image-2834 lazyload\"\/><noscript><img decoding=\"async\" width=\"800\" height=\"519\" src=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-2.jpg\" alt=\"\" class=\"wp-image-2834\" srcset=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-2.jpg 800w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-2-300x195.jpg 300w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-2-768x498.jpg 768w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-2-18x12.jpg 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Soluzioni sistemiche<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Quindi, come possiamo risolvere questo problema?<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pretrattamento della superficie (pulizia e attivazione)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To improve adhesion, we must increase the substrate&#8217;s surface energy.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Pulizia<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Rimuovere gli agenti distaccanti, l'olio e la polvere. In genere, questa operazione viene eseguita strofinando con alcool isopropilico (IPA) o soluzioni alcaline. Per requisiti pi\u00f9 elevati, \u00e8 necessaria la pulizia al plasma o a ultrasuoni.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Attivazione<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Dopo la pulizia, \u00e8 necessario aggiungere reattivit\u00e0. \u00c8 qui che entrano in gioco i trattamenti a corona, al plasma o alla fiamma. Questi metodi bombardano la superficie con particelle ad alta energia, rompendo i legami carbonio-idrogeno e formando gruppi polari (come gruppi idrossilici o carbossilici).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Priming<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Un metodo migliore consiste nell'applicare uno strato di agente accoppiante silanico o di polipropilene clorurato (primer speciale). In questo modo si crea una superficie reattiva che consente al rivestimento di aderire saldamente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Migliorare la bagnatura<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To reduce the coating&#8217;s surface tension.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Additivi<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Aggiungere agenti bagnanti efficaci (ad esempio, tensioattivi organici a base di silicio, fluorocarburi o dioli) per favorire la diffusione dell'acqua.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Formulazione<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Regolare il rapporto resina\/monomero e selezionare monomeri a basso ritiro per migliorare il livellamento e ridurre le sollecitazioni interne.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Controllo ambientale<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La temperatura e l'umidit\u00e0 della costruzione influiscono notevolmente sul risultato.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Umidit\u00e0<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Controllare l'umidit\u00e0 tra 50%-70%.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Temperatura<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Mantenere la temperatura tra 20-30\u00b0C. Il preriscaldamento del substrato a 40-60\u00b0C pu\u00f2 aiutare l'acqua a evaporare in modo pi\u00f9 uniforme, migliorando significativamente l'adesione e l'uniformit\u00e0.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"800\" height=\"507\" data-src=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-3.jpg\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\" class=\"wp-image-2835 lazyload\"\/><noscript><img decoding=\"async\" width=\"800\" height=\"507\" src=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-3.jpg\" alt=\"\" class=\"wp-image-2835\" srcset=\"https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-3.jpg 800w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-3-300x190.jpg 300w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-3-768x487.jpg 768w, https:\/\/www.seedchemever.com\/wp-content\/uploads\/2026\/04\/waterborne-coatings-solutions-3-18x12.jpg 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Il ruolo degli agenti di accoppiamento<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Si pensi all'agente di accoppiamento come a un ponte. Un'estremit\u00e0 reagisce con i gruppi idrossilici sulla superficie del substrato, mentre l'altra estremit\u00e0 reagisce con i gruppi della resina. Si mescola bene con la resina, unendo saldamente la superficie inorganica e il rivestimento organico.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Selezione<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La scelta dell'agente di accoppiamento sbagliato influisce notevolmente sulle prestazioni.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Per i sistemi poliolefinici, utilizzare il vinilsilano.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Per i sistemi epossidici, utilizzare il silano epossidico.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dosaggio<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In genere 0,5%-2% della formulazione. Prestare attenzione alla stabilit\u00e0 del pH e alla dispersione nei sistemi a base d'acqua.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Controllo dei parametri di processo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Per PP e PE (rivestimento), i parametri di pretrattamento devono essere rigorosamente controllati.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pulizia<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Utilizzare metodi diversi per i diversi inquinanti (solventi per il distacco delle muffe, alcali per l'olio, ultrasuoni per le strutture complesse). Fare attenzione a non gonfiare o danneggiare il substrato.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Irruvidimento<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Utilizzare carta vetrata o incisione chimica per ottenere l'uniformit\u00e0.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Attivazione<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Il trattamento al plasma ha una durata di conservazione breve. Il rivestimento deve essere applicato entro 24 ore.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Applicazione e polimerizzazione<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Spruzzatura<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Regolare l'apertura dell'ugello, la pressione dell'aria e la velocit\u00e0 della pistola. Controllare lo spessore del film in pi\u00f9 strati per ottenere l'uniformit\u00e0. Assicurarsi che l'aria compressa sia priva di olio e acqua. Gestire il tempo di appassimento e livellamento per evitare bolle o cedimenti.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Polimerizzazione<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Strictly follow the manufacturer&#8217;s temperature and time recommendations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Osservare la deformazione delle materie plastiche sensibili al calore.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Per la polimerizzazione UV, considerare la capacit\u00e0 di penetrazione.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Per i sistemi 2K, il rapporto di polimerizzazione \u00e8 fondamentale: una quantit\u00e0 eccessiva rende il film fragile; una quantit\u00e0 insufficiente provoca una reticolazione incompleta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Potresti essere interessato a: SEED <a href=\"https:\/\/www.seedchemever.com\/it\/rivestimenti-a-base-acquosa-rivestimenti-a-base-oleosa\/\" type=\"link\" id=\"https:\/\/www.seedchemever.com\/water-based-coatings-oil-based-coatings\/\">applicazione di rivestimenti all'acqua<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Garanzia di qualit\u00e0<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Misurare lo spessore del film e l'adesione per ogni lotto. In caso di problemi, risalire immediatamente al processo precedente. Solo coordinando tutti i collegamenti \u00e8 possibile eliminare questo collo di bottiglia e garantire la qualit\u00e0.<\/p>","protected":false},"excerpt":{"rendered":"<p>Today, let&#8217;s talk about a headache-inducing problem for many engineers: the persistent difficulty of achieving lasting adhesion when applying waterborne [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2833,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","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":""}},"_themeisle_gutenberg_block_has_review":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[1],"tags":[],"class_list":["post-2832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Challenge of Waterborne Coatings on PP &amp; 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