{"id":130760,"date":"2021-07-15T12:10:19","date_gmt":"2021-07-15T10:10:19","guid":{"rendered":"https:\/\/concentrol.com\/evolution-of-silicone-surfactants-for-high-resilience-hr-flexible-polyurethane-foam\/"},"modified":"2023-11-08T19:31:58","modified_gmt":"2023-11-08T17:31:58","slug":"evolucio-dels-surfactants-de-silicona-per-a-espuma-de-poliureta-flexible-dalta-resiliencia-hr","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/ca\/evolucio-dels-surfactants-de-silicona-per-a-espuma-de-poliureta-flexible-dalta-resiliencia-hr\/","title":{"rendered":"Evoluci\u00f3 dels surfactants de silicona per a espuma de poliuret\u00e0 flexible d&#8217;alta resili\u00e8ncia (HR)"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text]<span style=\"font-weight: 400;\">Els surfactants de silicona s\u00f3n copol\u00edmers formats per una base de silicona (part apolar) i poli\u00e8ters (part polar), generalment cadenes d\u2019\u00f2xid de polietil\u00e8 (OE) i cadenes d\u2019\u00f2xid de polipropil\u00e8 (OP). Els continguts d\u2019OE, OP i el contingut de silicona afecten significativament en la funci\u00f3 dels surfactants. Tamb\u00e9 el substituent en la posici\u00f3 terminal del poli\u00e8ter (R) pot influir en les propietats del surfactant.\u00a0 D\u2019aquesta manera, tamb\u00e9 es pot influir en les propietats finals de l&#8217;espuma de PU jugant \u00fanicament amb el surfactant, satisfaent aix\u00ed les diferents necessitats per les diferents aplicacions que podem trobar en el mercat, com espumes flexibles, espumes HR, espumes r\u00edgides, entre d\u2019altres.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Objectiu d\u2019aquests additius<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Els surfactants actuen com depressors de la tensi\u00f3 superficial reduint les difer\u00e8ncies de pressi\u00f3 entre les bombolles de diferents mides formades i, per tant, s&#8217;obt\u00e9 una millor estabilitat de les bombolles i una mida de cel\u00b7la mitjana petita. D&#8217;aquesta manera, els surfactants condicionen la formaci\u00f3 de c\u00e8l\u00b7lules fines, c\u00e8l\u00b7lules gruixudes, c\u00e8l\u00b7lules tancades i c\u00e8l\u00b7lules obertes, i aquestes estructures cel\u00b7lulars influeixen en les propietats finals de l&#8217;escuma de PU.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Tipus de surfactants<\/b><\/p>\n<p><span style=\"font-weight: 400;\">D&#8217;aquesta manera, es poden distingir dos grups principals de surfactants, els estabilitzadors d&#8217;escuma i els reguladors de cel\u00b7la.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Els estabilitzadors d&#8217;escuma s\u00f3n surfactants emprats en formulacions de PU cr\u00edtiques, \u00e9s a dir, formulacions que a causa del tipus de naturalesa qu\u00edmica dels components dels poliols i\/o isocianats o a causa de les quantitats de catalitzadors o d\u2019aigua, tenen molt poca estabilitat. En aquests casos es requereix un surfactant amb capacitat estabilitzant, el qual ajudi en el proc\u00e9s d&#8217;espumaci\u00f3 en l&#8217;expansi\u00f3 dels gasos. Trobem aquest tipus de surfactants en formulacions on s&#8217;utilitza \u00fanicament TDI o barreges de TDI \/ MDI, per\u00f2 amb alt percentatge de TDI.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">D&#8217;altra banda, trobem els reguladors de cel\u00b7la. Aquests surfactants estan dissenyats principalment per regular i unificar la mida i la distribuci\u00f3 de les cel\u00b7les. Aquests tensioactius estan dirigits per a formulacions de PU que per elles mateixes ja tenen una estabilitat elevada, capa\u00e7os de cr\u00e9ixer amb una estructura s\u00f2lida i consistent sense col\u00b7lapsar, sense la necessitat de l&#8217;ajuda d&#8217;un surfactant. Trobem aquest tipus de surfactants en formulacions on s&#8217;utilitza \u00fanicament MDI o barreges de TDI \/ MDI, per\u00f2 amb alt percentatge de MDI. Moltes vegades en el mercat se sol\u00b7licita els obridors de cel\u00b7la, que s\u00f3n surfactants reguladors de cel\u00b7la que augmenten la mida de la cel\u00b7la per evitar problemes de \u00abshrinkage\u00bb.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Espuma HR PU flexible<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Els surfactants de Concentrol de la gamma STB PU-12XX estan dirigits per l\u2019espuma de PU d\u2019alta resili\u00e8ncia, HR. Les formulacions HR tenen diferents necessitats d\u2019estabilitzaci\u00f3 i efici\u00e8ncia reguladora de cel\u00b7les, ja que trobem sistemes TDI, MDI o barreges d\u2019aquests. D\u2019aquesta manera\u00a0 cal oferir una \u00e0mplia gamma d\u2019additius per complir tots els requisits possibles. No obstant aix\u00f2, aquests sistemes solen ser bastant estables i se sol buscar una obertura d\u2019escuma ben equilibrada.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Un dels requisits que se sol demanar \u00e9s una for\u00e7a de compressi\u00f3 baixa. Es pot aconseguir el nivell \u00f2ptim de compressi\u00f3\u00a0 amb la selecci\u00f3 adequada de tensioactiu.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Al mateix temps, a causa dels requisits de legislaci\u00f3 cada cop m\u00e9s estrictes de la ind\u00fastria de l&#8217;autom\u00f2bil i el matal\u00e0s es busca la m\u00ednima contribuci\u00f3 a les emissions de components vol\u00e0tils.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Les emissions es classifiquen en VOC (compostos org\u00e0nics vol\u00e0tils) i FOG (compostos org\u00e0nics de \u201cfogging\u201d). Els VOC, que inclou VVOC (compostos org\u00e0nics molt vol\u00e0tils) i VOC, es desprenen f\u00e0cilment de l\u2019espuma de PU en un cotxe tancat a l\u2019estiu, quan es poden assolir temperatures internes entre 25 \u00b0C i 90 \u00b0C. Els FOG s\u00f3n la suma de VOC i SVOC (compostos org\u00e0nics semi-vol\u00e0tils) que s\u2019evaporen a temperatura superior a 90 \u00b0C.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Evoluci\u00f3 gamma Concentrol<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Donades aquestes casu\u00edstiques del sector, a Concentrol les l\u00ednies de surfactants han evolucionat en la direcci\u00f3 seg\u00fcent:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">STB PU-12XX PF: Segona l\u00ednia dissenyada lliure de ftalats per\u00f2 alt contingut d\u2019aldehids, dirigida m\u00e9s pel mercat europeu.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Per la determinaci\u00f3 dels VOC i FOG en materials d&#8217;interiors d&#8217;autom\u00f2bils, la metodologia m\u00e9s utilitzada a Europa \u00e9s la VDA278. El VDA (Verband der Automobilindustrie en alemany) \u00e9s el sistema alemany de gesti\u00f3 de la qualitat (QMS) de la ind\u00fastria de l\u2019autom\u00f2bil. Dins d\u2019aquests resultats, s\u2019han de buscar aquells components vol\u00e0tils que venen produ\u00efts pel surfactant.<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">STB PU-12XX PFJ: Tercera l\u00ednia dissenyada, lliure de ftalats amb baix contingut d\u2019aldehids i arom\u00e0tics, dirigida m\u00e9s pel mercat asi\u00e0tic, Xina i Jap\u00f3 sobretot.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Cal esmentar que en altres mercats com l\u2019asi\u00e0tic s\u2019utilitzen altres metodologies pel an\u00e0lisis dels VOC. A m\u00e9s, en aquest mateix mercat tamb\u00e9 es busca la m\u00ednima contribuci\u00f3 de compostos aldehids i arom\u00e0tics. D\u2019aquesta manera, en els \u00faltims anys s\u2019ha investigat la manera de reduir els VOC dels surfactants de silicona amb una nova generaci\u00f3 de productes que permeten l\u2019obtenci\u00f3 de espumes de PU amb valors d\u2019emissions relacionats amb l\u2019estabilitzant inferiors a 20ppm (per una dosis de 1pphp).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Per tots aquests motius, actualment existeixen 3 tipus de productes dintre de la l\u00ednia STB PU-12XX tot i que entre elles no hi ha difer\u00e8ncies de performance en l\u2019espuma de PU.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignleft wp-image-130724 size-thumbnail\" src=\"https:\/\/concentrol.com\/wp-content\/uploads\/2021\/07\/concentrol_autor_adria-1-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/07\/concentrol_autor_adria-1-150x150.jpg 150w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/07\/concentrol_autor_adria-1-300x300.jpg 300w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/07\/concentrol_autor_adria-1-768x768.jpg 768w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/07\/concentrol_autor_adria-1.jpg 800w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\"><strong>Autors: Adri\u00e0 L\u00f3pez &amp; Josep Nadal<br \/>\n<em>Responsable t\u00e8cnic &amp; Director t\u00e8cnic<\/em><\/strong><\/p>\n<p>[\/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%2F2021%2F07%2FCA_EVOLUCIO%CC%81-DELS-SURFACTANTS-PU.pdf|title:INFOGR%C3%80FIC|target:_blank\u00bb]Descarregar infogr\u00e0fic[\/vc_button][vc_column_text]<div class=\"wp-block-pdfemb-pdf-embedder-viewer\"><a href=\"https:\/\/concentrol.com\/wp-content\/uploads\/2021\/07\/CA_EVOLUCIO\u0301-DELS-SURFACTANTS-PU.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-toolbar=\"bottom\" data-toolbar-fixed=\"off\">CA_EVOLUCIO\u0301-DELS-SURFACTANTS-PU<\/a><\/div>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text]Els surfactants de silicona s\u00f3n copol\u00edmers formats per una base de silicona (part apolar) i poli\u00e8ters (part polar), generalment cadenes [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":130751,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[1020],"tags":[808],"class_list":["post-130760","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pu-additives-ca","tag-concentrol-ca"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Evoluci\u00f3 dels surfactants de silicona per a espuma de poliuret\u00e0 flexible d&#039;alta resili\u00e8ncia (HR)<\/title>\n<meta name=\"description\" content=\"Concentrol - Chemical Solutions\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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