{"id":1303,"date":"2026-08-03T14:22:37","date_gmt":"2026-08-03T06:22:37","guid":{"rendered":"https:\/\/bastone-petrochem.com\/?p=1303"},"modified":"2026-10-05T18:18:48","modified_gmt":"2026-10-05T10:18:48","slug":"2-eha-engine-coolant","status":"publish","type":"post","link":"https:\/\/bastone-petrochem.com\/es\/2-eha-engine-coolant\/","title":{"rendered":"Por qu\u00e9 los refrigerantes de motor usan 2-EHA y por qu\u00e9 algunos optan por no usar 2-EHA"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Dos concentrados de OAT se encuentran sobre el mismo escritorio del formulador: uno lista 2-etilhexanoato de potasio, el otro se anuncia como libre de 2-EHA. Esa diferencia podr\u00eda reflejar qu\u00edmica de corrosi\u00f3n, riesgo de elast\u00f3meros o ley de etiquetado, y cada respuesta apunta a una decisi\u00f3n de reformulaci\u00f3n diferente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Las tres respuestas tienen diferentes pesos de evidencia. La qu\u00edmica de corrosi\u00f3n es un mecanismo documentado, la historia del elast\u00f3mero es parte registro y parte folclore, y el factor de etiquetado es aritm\u00e9tica simple entre una tasa de tratamiento y un l\u00edmite de concentraci\u00f3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Leo las divulgaciones de inhibidores como leo las hojas de especificaciones de pol\u00edmeros: mecanismo primero, marketing al final. Ordenado as\u00ed, el 2-EHA se divide en tres decisiones separadas en lugar de una reputaci\u00f3n enredada.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u00e9 hace el 2-EHA en el refrigerante del motor<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El \u00e1cido 2-etilhexanoico act\u00faa en los refrigerantes de tecnolog\u00eda de aditivos org\u00e1nicos (OAT) como un inhibidor de corrosi\u00f3n formador de pel\u00edcula. Su ani\u00f3n carboxilato deposita una capa molecular solo en los sitios an\u00f3dicos donde existe potencial de corrosi\u00f3n, en lugar de establecer una capa protectora sacrificial como lo hacen los inhibidores de silicato y fosfato.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1376\" height=\"768\" src=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-1.jpg\" alt=\"Inhibici\u00f3n de corrosi\u00f3n por formaci\u00f3n de pel\u00edcula de carboxilato de 2-EHA en refrigerante de motor frente a la capa de silicato de sacrificio\" class=\"wp-image-1301\" srcset=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-1.jpg 1376w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-1-300x167.jpg 300w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-1-1024x572.jpg 1024w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-1-768x429.jpg 768w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-1-18x10.jpg 18w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-1-600x335.jpg 600w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Debido a que la pel\u00edcula no se consume por completo, el agotamiento se mantiene bajo. Arteco, que construy\u00f3 su tecnolog\u00eda de refrigerantes sobre carboxilatos, reporta tasas de agotamiento lo suficientemente bajas como para respaldar toda la vida \u00fatil del sistema de enfriamiento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La implementaci\u00f3n m\u00e1s conocida es el paquete familiar Dex-Cool descrito en la documentaci\u00f3n t\u00e9cnica de Penray:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00c1cido seb\u00e1cico, un carboxilato dib\u00e1sico que comparte la funci\u00f3n de formaci\u00f3n de pel\u00edcula<\/li>\n<li>2-EHA, el carboxilato monob\u00e1sico de trabajo pesado<\/li>\n<li>Toliltriazol, que protege cobre y lat\u00f3n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Esa combinaci\u00f3n protege el aluminio sin ning\u00fan silicato y tiene una vida \u00fatil nominal de 5 a\u00f1os o 150,000 millas en autom\u00f3viles de pasajeros.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En una etiqueta de concentrado, el \u00e1cido rara vez aparece como \u00e1cido libre. La literatura de patentes (EP1119593B1 de Prestone) prefiere sales de sodio o potasio, con el refrigerante terminado ajustado a un pH de 6.5 a 9.0. La base es 90 a 99.89% de alcohol l\u00edquido, t\u00edpicamente <a href=\"https:\/\/bastone-petrochem.com\/es\/product\/107-21-1\/\">Etilenglicol<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En un certificado de an\u00e1lisis, el 2-etilhexanoato de potasio se lee como CAS 3164-85-0, mientras que el \u00e1cido libre se lee como CAS 149-57-5. Una pantalla de ingredientes que busca solo uno de ellos pierde el otro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La historia de la ventaja tiene un contrapeso documentado: las propias preguntas frecuentes de Penray citan un estudio de Ford Motor Company que concluy\u00f3 que los refrigerantes de \u00e1cido org\u00e1nico no ofrecen al consumidor una ventaja significativa sobre las f\u00f3rmulas convencionales de Am\u00e9rica del Norte. La hoja de especificaciones te da la ventana; la aplicaci\u00f3n te dice qu\u00e9 esquina de la ventana realmente necesitas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfDa\u00f1a el 2-EHA las juntas y los sellos de silicona?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El 2-EHA puede degradar elast\u00f3meros espec\u00edficos, pero el registro documentado es m\u00e1s limitado que la abreviatura de que se come la silicona. Kost USA, un fabricante de refrigerantes que vende l\u00edneas libres de 2-EH, describe el modo de falla como el \u00e1cido encogiendo y secando el elast\u00f3mero hasta que la pieza distorsionada tiene fugas, siendo los sellos y juntas de silicona la clase m\u00e1s vulnerable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cada afirmaci\u00f3n en esta controversia se encuentra en un nivel de evidencia diferente:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Afirmaci\u00f3n<\/th><th>Respaldo<\/th><th>Grado de evidencia<\/th><\/tr><\/thead><tbody><tr><td>El 2-EH encoge y seca los elast\u00f3meros; la silicona es la m\u00e1s vulnerable<\/td><td>Bolet\u00edn de Kost USA (proveedor de l\u00edneas libres de 2-EH)<\/td><td>Descripci\u00f3n de mecanismo publicada<\/td><\/tr><tr><td>Dex-Cool degrad\u00f3 juntas de admisi\u00f3n y form\u00f3 lodo<\/td><td>Demanda colectiva de GM, resuelta en 2008<\/td><td>Alegato resuelto<\/td><\/tr><tr><td>Ablanda pl\u00e1sticos, particularmente silicona<\/td><td>Cita atribuida a SAE; documento original no localizado<\/td><td>Atribuci\u00f3n no verificada<\/td><\/tr><tr><td>Compatible con nailon reforzado con vidrio<\/td><td>Informes de la comunidad de mec\u00e1nicos<\/td><td>An\u00e9cdota<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Las cifras del acuerdo explican por qu\u00e9 la historia nunca muri\u00f3. GM pag\u00f3 $40-60 millones bajo el acuerdo de octubre de 2008, con reembolsos de $50 a $800 por miembro de la clase. La quiebra de 2009 luego redujo los pagos restantes a aproximadamente el 30% del valor de la reclamaci\u00f3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ning\u00fan tribunal adjudic\u00f3 el mecanismo. La alegaci\u00f3n de lodo es mec\u00e1nicamente distinta de la alegaci\u00f3n de juntas; las comunidades de propietarios culpan a la ingesti\u00f3n de aire en sistemas de llenado bajo por el lodo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La descripci\u00f3n de encoger y secar me parece qu\u00edmicamente plausible. El 2-EHA es el hermano \u00e1cido del 2-etilhexanol, el alcohol detr\u00e1s de los plastificantes de clase DEHP.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La misma estructura C8 ramificada que hace que el carboxilato sea soluble en glicol tambi\u00e9n le da afinidad por ciertas matrices de pol\u00edmeros. Absorbido en un elast\u00f3mero susceptible, act\u00faa como plastificante; extra\u00eddo nuevamente, el compuesto se encoge y se endurece.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1376\" height=\"768\" src=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-2.jpg\" alt=\"Encogimiento y endurecimiento del sello de silicona por 2-EHA en refrigerante de motor comparado con un sello intacto\" class=\"wp-image-1302\" srcset=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-2.jpg 1376w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-2-300x167.jpg 300w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-2-1024x572.jpg 1024w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-2-768x429.jpg 768w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-2-18x10.jpg 18w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/07\/2-eha-in-engine-coolant-2-600x335.jpg 600w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Ese razonamiento aboga por la calificaci\u00f3n compuesto por compuesto, no por la evitaci\u00f3n general. Los informes de nailon reforzado con vidrio que se mantiene en servicio encajan en la misma imagen: el riesgo se concentra en compuestos espec\u00edficos de silicona y juntas antiguas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Por qu\u00e9 existen los refrigerantes libres de 2-EHA<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Las l\u00edneas de productos libres de 2-EHA se remontan a un cambio de clasificaci\u00f3n europeo, no a un veredicto de rendimiento de corrosi\u00f3n. Bajo el reglamento CLP de la UE, el 2-EHA y sus <a href=\"https:\/\/bastone-petrochem.com\/es\/metal-octoates\/\">sales de 2-etilhexanoato<\/a> Llevan una clasificaci\u00f3n de Toxicidad para la reproducci\u00f3n Categor\u00eda 1B, y el l\u00edmite de concentraci\u00f3n que activa el etiquetado baj\u00f3 de 4.5% a 0.3%, vinculante desde el 1 de diciembre de 2023.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compare ese l\u00edmite con las tasas de tratamiento que revela la literatura de patentes: cargas preferidas de carboxilato de 2 a 4% en peso, aproximadamente 7 a 13 veces el nuevo umbral. Un refrigerante terminado no puede mantener el \u00e1cido a concentraci\u00f3n de trabajo y permanecer bajo la l\u00ednea de etiquetado. Eliminar la qu\u00edmica es la \u00fanica forma de salir de la etiqueta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La respuesta del mercado sigui\u00f3 la aritm\u00e9tica. Q8Oils retir\u00f3 peque\u00f1os paquetes de su anticongelante de larga duraci\u00f3n con 2-EHA del segmento de consumo en el cuarto trimestre de 2023 e introdujo una l\u00ednea de reemplazo libre de 2-EHA y sus sales, mientras que el suministro a granel e industrial continu\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un umbral de clasificaci\u00f3n no es una prohibici\u00f3n: lea el l\u00edmite de concentraci\u00f3n antes de leer el titular. La clasificaci\u00f3n cambia lo que una etiqueta orientada al consumidor debe decir; no dice nada sobre c\u00f3mo funciona el inhibidor contra los criterios de prueba de corrosi\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u00e9 usan en su lugar las formulaciones libres de 2-EHA<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un paquete OAT libre de 2-EHA suele ser un carboxilato hermano, no una tecnolog\u00eda de inhibici\u00f3n diferente. La misma patente que divulga las tasas de tratamiento tipo Dex-Cool nombra las alternativas: \u00e1cido seb\u00e1cico, neooctanoico, neodecanoico, benzoico, t-butilbenzoico y dodecanedioico, todos dosificados de la misma manera como sales de sodio o potasio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sustituir un \u00e1cido por otro reabre la matriz de calificaci\u00f3n de corrosi\u00f3n que los refrigerantes de servicio ligero ejecutan bajo ASTM D3306:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosi\u00f3n en cristaler\u00eda ASTM D1384: p\u00e9rdida de peso de aluminio de 30.0 mg como m\u00e1ximo para aprobar<\/li>\n<li>Erosi\u00f3n por cavitaci\u00f3n ASTM D2809: una calificaci\u00f3n m\u00ednima de 8<\/li>\n<li>Superficies de aluminio con rechazo de calor ASTM D4340: 1.0 mg\/cm\u00b2 por semana como m\u00e1ximo<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">La cuesti\u00f3n del elast\u00f3mero tampoco desaparece. Un carboxilato de reemplazo necesita su propia evaluaci\u00f3n de compatibilidad contra los compuestos de sellos y juntas en la flota objetivo. No sustituyas una qu\u00edmica de inhibidor por otra sin recalificar contra el modo de fallo real.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La calificaci\u00f3n debe ocurrir de antemano porque no puede ocurrir en servicio; Penray se\u00f1ala que los niveles de carboxilato inhibidor no se pueden verificar en el campo a un costo razonable. El abastecimiento es la mitad m\u00e1s simple de la decisi\u00f3n: los paquetes que mantienen el \u00e1cido pueden suministrarse con grado industrial <a href=\"https:\/\/bastone-petrochem.com\/es\/product\/2-ethylhexanoic-acid\/\">2-EHA<\/a> (CAS 149-57-5) a trav\u00e9s de los mismos canales a granel que transportan el fluido base de glicol.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Lo que la mayor\u00eda de los formuladores entienden mal<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El error recurrente es tratar la cuesti\u00f3n de la junta y la cuesti\u00f3n de clasificaci\u00f3n como un solo problema. Se basan en evidencia diferente: litigios resueltos m\u00e1s descripciones de mecanismo por un lado, un l\u00edmite de concentraci\u00f3n publicado por el otro, y apuntan a acciones diferentes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Calif\u00edcalos por separado. Si la evaluaci\u00f3n de elast\u00f3mero pasa contra los compuestos de sellos reales de tu flota, el 2-EHA sigue siendo un formador de pel\u00edcula an\u00f3dica de agotamiento lento, y eliminarlo se convierte en una decisi\u00f3n de etiquetado y acceso al mercado en lugar de una qu\u00edmica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reformula para la etiqueta sin volver a ejecutar la evaluaci\u00f3n de elast\u00f3mero, y heredas la misma cuesti\u00f3n de compatibilidad bajo un nuevo nombre de \u00e1cido.<\/p>","protected":false},"excerpt":{"rendered":"<p>Two OAT concentrate disclosures sit on the same formulator&#8217;s desk: one lists potassium 2-ethylhexanoate, the other advertises itself as 2-EHA-free. That difference could reflect corrosion chemistry, elastomer risk, or labeling law, and each answer points at a different reformulation decision. The three answers carry different weights of evidence. The corrosion chemistry is documented mechanism, the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":1301,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1303","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Engine Coolants Use 2-EHA and Why Some Go 2-EHA-Free - BASTONE<\/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:\/\/bastone-petrochem.com\/es\/2-eha-engine-coolant\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Engine Coolants Use 2-EHA and Why Some Go 2-EHA-Free - BASTONE\" \/>\n<meta property=\"og:description\" content=\"Two OAT concentrate disclosures sit on the same formulator&#8217;s desk: one lists potassium 2-ethylhexanoate, the other advertises itself as 2-EHA-free. That difference could reflect corrosion chemistry, elastomer risk, or labeling law, and each answer points at a different reformulation decision. The three answers carry different weights of evidence. 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