{"id":134423,"date":"2021-12-15T10:37:25","date_gmt":"2021-12-15T08:37:25","guid":{"rendered":"https:\/\/concentrol.com\/silicone-surfactants-for-polyurethane-systems-in-footwear-part-1\/"},"modified":"2021-12-15T10:47:11","modified_gmt":"2021-12-15T08:47:11","slug":"els-surfactants-de-silicona-per-a-sistemes-de-poliureta-en-calcat-part-1","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/ca\/els-surfactants-de-silicona-per-a-sistemes-de-poliureta-en-calcat-part-1\/","title":{"rendered":"Els surfactants de silicona per a sistemes de poliuret\u00e0 en cal\u00e7at &#8211; PART 1"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb140097&#8243;]<span style=\"font-weight: 400;\">Concentrol \u00e9s una empresa referent el sector de solucions qu\u00edmiques que treballa estructurant les seves refer\u00e8ncies en quatre divisions: Performance Materials, Food Processing Aids, Additives i Adhesives. El cal\u00e7at \u00e9s un dels sectors que compta amb m\u00e9s refer\u00e8ncies de Concentrol per al proc\u00e9s de confecci\u00f3 de soles monodensitat i soles i sabates bidensitat. A m\u00e9s, disposen de productes pels diferents processos de fabricaci\u00f3: injecci\u00f3 directa o muntatge posterior.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Els surfactants de silicona s\u00f3n copol\u00edmers formats per una base de silicona i poli\u00e8ters i cadenes d\u2019\u00f2xid de polietil\u00e8 i de polipropil\u00e8. Els diferents tipus de composicions que es puguin fer entre tots aquests elements donar\u00e0 lloc a difer\u00e8ncies en la funci\u00f3 del surfactant final.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Les <\/span><b>espumes de poliuret\u00e0<\/b><span style=\"font-weight: 400;\"> pensades exclusivament per cal\u00e7at o per espuma de poliuret\u00e0 integral tenen una composici\u00f3 molt similar, i per aix\u00f2 hi ha surfactants que poden treballar amb ambd\u00f3s sistemes indistintament. No obstant aix\u00f2, tamb\u00e9 cal tenir en compte que existeixen diferents tipus de surfactants: aquells que estan dissenyats per a sistemes de PU a base de poli\u00e8ter (en PU integral i cal\u00e7at) i els que s\u00f3n per a sistemes de base de poli\u00e8ster (\u00fanicament en PU per a cal\u00e7at). Per altra banda, hi ha estabilitzants de silicona que es poden utilitzar tamb\u00e9 en combinaci\u00f3 amb altres surfactants, de manera que actuen com a co-surfactants, oferint millores a l\u2019aspecte superficial i l\u2019estructura cel\u00b7lular de l\u2019espuma.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Aquesta tipologia d\u2019espuma de PU, molt semblant a les caracter\u00edstiques que t\u00e9 el cautx\u00fa, sol tenir propietats el\u00e0stiques i resist\u00e8ncia a l\u2019abrasi\u00f3. En el cas de <\/span><b>les soles de sabata<\/b><span style=\"font-weight: 400;\">, l\u2019\u00fas d\u2019aquesta espuma \u00e9s molt adequada, ja que permet aportar un punt de resist\u00e8ncia al desgast propi del dia a dia.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A l\u2019hora d\u2019avaluar l\u2019espuma de poliuret\u00e0, una vegada formulat el sistema amb els surfactants adequats, cal tenir en compte quatre factors que s\u00f3n claus per poder determinar la seva qualitat:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Les seves <\/span><b>propietats Ross-Flex<\/b><span style=\"font-weight: 400;\">, \u00e9s a dir, la resist\u00e8ncia a la flexibilitat. Amb una m\u00e0quina es calcula la capacitat que t\u00e9 el material a resistir-se a l\u2019esquerdament a causa d\u2019una flexi\u00f3 cont\u00ednua i r\u00e0pida. En les proves d\u2019aquest par\u00e0metre s\u2019usa un aparell que fa unes 100 vegades un mateix moviment de manera repetida.\u00a0<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"size-medium wp-image-134392 aligncenter\" src=\"https:\/\/concentrol.com\/wp-content\/uploads\/2021\/12\/1_rb-288x300.png\" alt=\"\" width=\"288\" height=\"300\" srcset=\"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/1_rb-288x300.png 288w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/1_rb.png 534w\" sizes=\"(max-width: 288px) 100vw, 288px\" \/><\/p>\n<p style=\"text-align: center;\"><em><span style=\"font-weight: 400;\">En aquesta imatge es pot veure l\u2019aparell t\u00e8cnic que s\u2019usa per analitzar les propietats Ross-Flex a l\u2019inici de la prova i en la fase de flexi\u00f3 del material d\u2019estudi.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">El seu grau de <\/span><b>duresa<\/b><span style=\"font-weight: 400;\">. La duresa natural dels materials se sol calcular amb uns aparells anomenats dur\u00f2metres, en els quals es fan servir una s\u00e8rie de pl\u00e0stics i gomes. Tanmateix, val a dir que no \u00e9s possible establir una relaci\u00f3 simple entre la duresa del material i la propietat fonamental d\u2019aquest.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Resist\u00e8ncia a la tracci\u00f3<\/b><span style=\"font-weight: 400;\">, \u00e9s a dir, la resist\u00e8ncia natural d\u2019un material pl\u00e0stic al trencament per una for\u00e7a d\u2019elongaci\u00f3. Aquest par\u00e0metre se sol mesurar amb un dinam\u00f2metre, i l\u2019exercici consisteix en tallar una pe\u00e7a del material amb forma de lla\u00e7 i calcular quina for\u00e7a necessita aquest per trencar-se.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"size-medium wp-image-134398 aligncenter\" src=\"https:\/\/concentrol.com\/wp-content\/uploads\/2021\/12\/2_rb-229x300.png\" alt=\"\" width=\"229\" height=\"300\" srcset=\"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/2_rb-229x300.png 229w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/2_rb.png 313w\" sizes=\"(max-width: 229px) 100vw, 229px\" \/><\/p>\n<p style=\"text-align: center;\"><em><span style=\"font-weight: 400;\">L\u2019aparell amb qu\u00e8 es mesura la resist\u00e8ncia de tracci\u00f3 d\u2019un material, en ple assaig.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">La <\/span><b>regulaci\u00f3 cel\u00b7lular<\/b><span style=\"font-weight: 400;\">. \u00c9s important analitzar al detall els components del material per intentar buscar una estructura cel\u00b7lular com m\u00e9s petita i uniforme millor, minimitzant tamb\u00e9 defectes superficials com els \u201c<\/span><i><span style=\"font-weight: 400;\">pinholes<\/span><\/i><span style=\"font-weight: 400;\">\u201d, \u00e9s a dir, aquells petits cr\u00e0ters que poden apar\u00e8ixer a la superf\u00edcie dels productes i que comprometen la seva resist\u00e8ncia i estanquitat. Finalment, cal apuntar tamb\u00e9 que \u00e9s preferible buscar una obertura cel\u00b7lular que sigui completa o parcialment oberta, ja que una estructura cel\u00b7lular tancada condueix a defectes de \u201c<\/span><i><span style=\"font-weight: 400;\">shrinkage<\/span><\/i><span style=\"font-weight: 400;\">\u201d, \u00e9s a dir, contraccions o encongiments.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"size-medium wp-image-134404 aligncenter\" src=\"https:\/\/concentrol.com\/wp-content\/uploads\/2021\/12\/3_rb-300x152.png\" alt=\"\" width=\"300\" height=\"152\" srcset=\"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/3_rb-300x152.png 300w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/3_rb-1024x519.png 1024w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/3_rb-768x390.png 768w, https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/wp-content\/uploads\/2021\/12\/3_rb.png 1506w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p style=\"text-align: center;\"><em><span style=\"font-weight: 400;\">En la primera imatge es pot veure la composici\u00f3 al detall d\u2019una cel\u00b7la oberta. La segona mostra una cel\u00b7la tancada.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Aquests aspectes de l\u2019espuma es poden regular amb l\u2019<\/span><b>\u00fas dels surfactants<\/b><span style=\"font-weight: 400;\">, ja que es tracta d\u2019uns additius que permeten condicionar la formulaci\u00f3 de c\u00e8l\u00b7lules fines, gruixudes, tancades i obertes, i aquestes estructures cel\u00b7lulars <\/span><b>influeixen en les propietats finals de l\u2019espuma de PU<\/b><span style=\"font-weight: 400;\"> integral i per a cal\u00e7at.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Concentrol \u00e9s una empresa diversificada que treballa per fer arribar les seves solucions qu\u00edmiques a tots els sectors, i investiga per fer que aquestes siguin el m\u00e0xim de sostenibles. Els clients finals s\u00f3n una de les parts m\u00e9s importants per a Concentrol, i per aix\u00f2 sempre procura buscar el millor servei possible i la personalitzaci\u00f3 dels productes.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Autor: <em>Josep Nadal &#8211; Technical Manager<\/em><\/strong>[\/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%2F12%2FCA_ELS-SURFACTANS-DE-SILICONA-PER-A-SISTEMES-DE-POLIURETA-A-EN-CALCAT-PART-1.pdf|target:_blank\u00bb uncode_shortcode_id=\u00bb673806&#8243;]Descarregar infografia[\/vc_button][vc_column_text uncode_shortcode_id=\u00bb705387&#8243;]<div class=\"wp-block-pdfemb-pdf-embedder-viewer\"><a href=\"https:\/\/concentrol.com\/wp-content\/uploads\/2021\/12\/CA_ELS-SURFACTANS-DE-SILICONA-PER-A-SISTEMES-DE-POLIURETA-A-EN-CALCAT-PART-1.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-toolbar=\"bottom\" data-toolbar-fixed=\"off\">CA_ELS-SURFACTANS-DE-SILICONA-PER-A-SISTEMES-DE-POLIURETA-A-EN-CALCAT-PART-1<\/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=\u00bb140097&#8243;]Concentrol \u00e9s una empresa referent el sector de solucions qu\u00edmiques que treballa estructurant les seves refer\u00e8ncies en quatre divisions: [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":134412,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[127],"tags":[808],"class_list":["post-134423","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-desemmotllantsrb","tag-concentrol-ca"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - 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