{"id":142971,"date":"2022-12-16T12:30:20","date_gmt":"2022-12-16T10:30:20","guid":{"rendered":"https:\/\/concentrol.com\/mould-release-agents-for-cold-curing-polyurethane-foam\/"},"modified":"2022-12-16T12:35:46","modified_gmt":"2022-12-16T10:35:46","slug":"desmoldeantes-para-espuma-de-poliuretano-de-curado-en-frio","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/es\/desmoldeantes-para-espuma-de-poliuretano-de-curado-en-frio\/","title":{"rendered":"Desmoldeantes para espuma de poliuretano de curado en fr\u00edo"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb438321&#8243;]<span style=\"font-weight: 400;\">El poliuretano es un material <\/span><b>pl\u00e1stico <\/b><span style=\"font-weight: 400;\">que se caracteriza por estar formado por cadenas polim\u00e9ricas m\u00e1s o menos entrecruzadas, dando materiales desde muy blandos hasta completamente r\u00edgidos.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Est\u00e1 compuesto por una familia de pol\u00edmeros muy vers\u00e1til, ya que tienen m\u00faltiples aplicaciones muy distintas entre s\u00ed, por ejemplo, en pinturas, fibras, adhesivos reactivos en base agua, solvente o <\/span><i><span style=\"font-weight: 400;\">solvent-less<\/span><\/i><span style=\"font-weight: 400;\">, espumas moldeadas o en continuo, textil, dispersiones acuosas para m\u00faltiples aplicaciones, etc.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Estos pol\u00edmeros se forman a partir de reacciones exot\u00e9rmicas de polimerizaci\u00f3n de los dos componentes principales: el Isocianato y el Poliol.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Por regla general, los materiales reactivos (poliol e isocianato) se introducen en el molde a trav\u00e9s de una colada o inyecci\u00f3n premezclada a alta o baja presi\u00f3n, formando en pocos minutos la pieza que, tras ser desmoldada, deja el molde libre para repetir de nuevo todo el proceso. La pieza resultante reproduce todos los detalles del molde, ya que la espuma de poliuretano<\/span><b> se expande y \u201crellena\u201d todo el espacio vac\u00edo del molde<\/b><span style=\"font-weight: 400;\">, obteniendo as\u00ed la forma deseada de la pieza.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><b>Espuma flexible de poliuretano de curado en fr\u00edo<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Con este proceso productivo se producen espumas para asientos, respaldos, y reposacabezas para autom\u00f3viles y otros medios de transporte como aviones, autobuses o trenes. Tambi\u00e9n se pueden hacer piezas para mobiliario y para el sector del descanso.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Este tipo de producci\u00f3n cada vez es el m\u00e1s escogido por los fabricantes, porque <\/span><b>no requiere tanto consumo energ\u00e9tico <\/b><span style=\"font-weight: 400;\">como el curado en caliente.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Los moldes de este tipo de espuma flexible pueden ser desde aluminio hasta madera pasando por acero inoxidable o resina epoxi. En instalaciones de moldeado de espuma para sectores importantes, como automoci\u00f3n o mobiliario, suelen tener los moldes de acero o aluminio, mientras que en pa\u00edses o sectores con escasa tecnolog\u00eda o con niveles de aceptaci\u00f3n y calidad m\u00e1s relajados, pueden usarse materiales como la resina epoxi o la madera.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">El molde es un factor determinante puesto cada uno tiene un <\/span><b>desmoldeante <\/b><span style=\"font-weight: 400;\">adecuado; en la producci\u00f3n de espuma flexible desmoldada con producto base agua o hibrido, si entra en contacto con superficies f\u00e9rricas aparecer\u00e1n signos de oxidaci\u00f3n a corto o medio plazo.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">El tipo de instalaciones de la espuma flexible de curado en fr\u00edo puede ser muy variada, como carruseles en movimiento o moldes fijos, con mezcla de componentes a alta o baja presi\u00f3n. El tipo de inyecci\u00f3n implica, en el caso de la alta presi\u00f3n, una entrada de los componentes mezclados m\u00e1s r\u00e1pidamente y muy poco pre reaccionados, y m\u00e1s lentamente y m\u00e1s pre reaccionados en baja presi\u00f3n. La colada a alta presi\u00f3n interact\u00faa con el <\/span><b>desmoldeante <\/b><span style=\"font-weight: 400;\">mucho m\u00e1s que la mezclada a baja presi\u00f3n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Cabe destacar que <\/span><b>la baja presi\u00f3n<\/b><span style=\"font-weight: 400;\"> est\u00e1 desapareciendo, pues genera residuo de disolvente de limpieza al proceder a la eliminaci\u00f3n de restos de poliuretano despu\u00e9s de cada colada. En alta presi\u00f3n, la operaci\u00f3n es <\/span><i><span style=\"font-weight: 400;\">auto limpiante<\/span><\/i><span style=\"font-weight: 400;\"> sin necesidad de disolvente.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Mencionar tambi\u00e9n la \u201c<\/span><b>espuma viscoel\u00e1stica<\/b><span style=\"font-weight: 400;\">\u201d, muy conocida en la industria del descanso, si bien tiene aplicaciones en piezas para autom\u00f3vil. Se trata de espuma flexible de curado en fr\u00edo cuya principal caracter\u00edstica es su adaptaci\u00f3n al cuerpo, facilitando el descanso en los colchones fabricados con este material.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Se denomina tambi\u00e9n \u201cmemory foam\u201c pues siempre recupera, de manera pausada, su forma original. Los desmoldeantes para este tipo de espuma deben compensar el efecto tipo \u201cventosa\u201d que se origina al ser una espuma de poro cerrado y de pegajosidad superficial. Se suele trabajar en un amplio margen de temperatura, dependiendo del cliente y su formulaci\u00f3n, entre ambiente y 65\u00baC.<\/span><\/p>\n<p><b>\u00a0<\/b><\/p>\n<p><b>Tratamientos posteriores al desmoldeo y propiedades superficiales necesarias seg\u00fan destino de la pieza<\/b><\/p>\n<p><span style=\"font-weight: 400;\">En muchas de las piezas se requiere tacto anti\u2013ruido, para evitar el sonido que se produce entre la espuma y el armaz\u00f3n met\u00e1lico al sentarnos o movernos sobre el asiento.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Habitualmente se soluciona aplicando a posteriori, despu\u00e9s del desmoldeo, un producto de acabado graso y color azul, para ver si donde se ha pintado, en la superficie donde reside el problema de ruido (hay soluciones de productos que se detectan por UV y no precisan del color azul).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dentro de estos productos anti-ruido hay formulaciones de diferentes caracter\u00edsticas para cubrir todas las necesidades de mercado y normativas existentes. Lo que debe hacer el desmoldeante, es facilitar el enfundado de las piezas aportando, dentro de lo posible, un tacto suave y deslizante. En la actualidad se consigue a base de poro peque\u00f1o y uniforme, y con la ayuda de alg\u00fan deslizante superficial incorporado al mismo producto, si bien no se puede dar un tacto muy suave debido a que los productos para este fin, suelen dar problemas de irregularidades o ataques superficiales.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Los asientos de los coches actuales suelen llevar sensores de detecci\u00f3n de presencia, para avisar de abrocharse el cintur\u00f3n. Tambi\u00e9n en gamas m\u00e1s altas llevan de serie napas calefactoras para calentar el asiento en \u00e9pocas fr\u00edas. Esto implica que la pieza desmoldada debe permitir que en su superficie se peguen perfectamente los tratamientos autoadhesivos que llevan las piezas mencionadas. El caso del sensor de presencia es particularmente importante, pues se considera un elemento de seguridad y debe quedar perfectamente adherido.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Los desmoldeantes son productos que intervienen en sobremanera en el proceso productivo de las piezas de espuma de poliuretano. Por este motivo, <\/span><b>Concentrol <\/b><span style=\"font-weight: 400;\">investiga constantemente nuevas propiedades y formulaciones que se adapten a las nuevas necesidades de la industria. La reducci\u00f3n del VOC, la eliminaci\u00f3n del <\/span><i><span style=\"font-weight: 400;\">descostre <\/span><\/i><span style=\"font-weight: 400;\">o el desarrollo de productos en base agua para todo tipo de aplicaciones son un reto constante para el equipo t\u00e9cnico de nuestra empresa qu\u00edmica.<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=\u00bb1\/1&#8243;][vc_button border_width=\u00bb0&#8243; link=\u00bburl:https%3A%2F%2Fconcentrol.com%2Fwp-content%2Fuploads%2F2022%2F12%2FES_espuma-pu-curat-fred_compressed.pdf|target:_blank\u00bb uncode_shortcode_id=\u00bb107042&#8243;]Descargar infograf\u00eda[\/vc_button][vc_column_text uncode_shortcode_id=\u00bb155516&#8243;]<div class=\"wp-block-pdfemb-pdf-embedder-viewer\"><a href=\"https:\/\/concentrol.com\/wp-content\/uploads\/2022\/12\/ES_espuma-pu-curat-fred_compressed.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-toolbar=\"bottom\" data-toolbar-fixed=\"off\">ES_espuma-pu-curat-fred_compressed<\/a><\/div>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb438321&#8243;]El poliuretano es un material pl\u00e1stico que se caracteriza por estar formado por cadenas polim\u00e9ricas m\u00e1s o menos entrecruzadas, [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":142931,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[196],"tags":[930,931],"class_list":["post-142971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-performance-materials-es-2","tag-cardboard-es","tag-paper-es"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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