{"id":159655,"date":"2024-10-08T14:35:47","date_gmt":"2024-10-08T12:35:47","guid":{"rendered":"https:\/\/concentrol.com\/?p=159655"},"modified":"2024-10-09T10:22:55","modified_gmt":"2024-10-09T08:22:55","slug":"additius-superficies-silicona-aplicacions-beneficis","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/ca\/additius-superficies-silicona-aplicacions-beneficis\/","title":{"rendered":"Additius de superficie de silicona. Aplicacions i beneficis"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb703790″]<\/p>\n

Introducci\u00f3<\/h3>\n

Els additius de superficie de silicona s\u00f3n essencials en moltes aplicacions industrials, com la formulaci\u00f3 de pintures, tintes i recobriments. El seu principal avantatge \u00e9s la capacitat de reduir la tensi\u00f3 superficial, millorant la humectaci\u00f3 sobre diferents substrats. A m\u00e9s, ofereixen funcionalitats espec\u00edfiques que milloren el rendiment del producte.<\/p>\n

Amb m\u00e9s de 75 anys d’experi\u00e8ncia, Concentrol \u00e9s un expert l\u00edder en el desenvolupament i fabricaci\u00f3 d’especialitats qu\u00edmiques. Al llarg de la seva traject\u00f2ria, l’empresa ha prioritzat la recerca i la innovaci\u00f3, proporcionant cont\u00ednuament solucions qu\u00edmiques d’avantguarda adaptades a les necessitats dels seus clients.<\/p>\n

A Concentrol produ\u00efm copol\u00edmers de polidimetilsilox\u00e0-poli\u00e8ter, que formen la base dels nostres additius de superf\u00edcie de silicona. Aquesta experi\u00e8ncia ens permet dissenyar estructures \u00faniques personalitzades per a cada aplicaci\u00f3, assegurant un rendiment \u00f2ptim. Els nostres copol\u00edmers no hidrolitzables de polisilox\u00e0 i poli\u00e8ter s\u00f3n especialment resistents a condicions extremes, oferint estabilitat duradora fins i tot en entorns hostils.<\/p>\n

Qu\u00e8 s\u00f3n els tensioactius de silicona?<\/h3>\n

Els additius de superficie de silicona pertanyen a un grup especial de tensioactius, on una columna vertebral hidrof\u00f2bica (polidimetilsilox\u00e0, PDMS) est\u00e0 connectada a un o diversos grups polars. Els grups polars m\u00e9s comuns s\u00f3n les unitats i\u00f2niques d’\u00f2xid d’etil\u00e8 (OE) i \u00f2xid de polipropil\u00e8 (OP), tot i que n’hi ha d’altres. La longitud de la cadena de PDMS (determinada per les unitats x<\/strong> i w<\/strong>) controla el pes molecular, mentre que l’equilibri entre aquestes unitats defineix el grau de ramificaci\u00f3. Els grups de PDMS i poli\u00e8ter estan units per un enlla\u00e7 de propil (-CH2CH2CHE2-) estable i no hidrolitzable, proporcionant durabilitat en diverses aplicacions.<\/p>\n

La relaci\u00f3 entre les unitats d’OE (n) i d’OP (m) influeix en la polaritat del segment de poli\u00e8ter, la qual cosa afecta la seva interacci\u00f3 amb diferents superf\u00edcies. El nombre total d’aquestes unitats determina el pes molecular de l’additiu. Un altre factor crucial \u00e9s el grup terminal de la cadena de poli\u00e8ter, que pot ser un grup hidroxil (-OH) o estar substitu\u00eft per altres grups funcionals no reactius. Aix\u00f2 \u00e9s especialment important en formulacions que contenen components qu\u00edmics reactius, com els isocianats, on es prefereixen els agents humectants amb grups terminals no reactius.<\/p>\n

Quan s\u2019aplica a una superf\u00edcie, el segment no polar de PDMS s\u2019orienta cap a l\u2019aire, mentre que la part polar interacciona amb la fase l\u00edquida, donant a aquests copol\u00edmers les seves propietats tensioactives. Reduint la tensi\u00f3 superficial dels l\u00edquids, disminueixen l’angle de contacte entre el recobriment i el substrat, millorant la humectaci\u00f3 de la superf\u00edcie.<\/p>\n

\"\"<\/a><\/h3>\n
Imatge 1. Estructura general d’un copol\u00edmer de polidimetilsilox\u00e0 i poli\u00e8ter<\/h5>\n

Aplicacions i beneficis<\/h3>\n

Els agents humectants de silicona s\u00f3n essencials en formulacions dissenyades per a tractaments superficials, com pintures, recobriments, vernissos i tintes d\u2019impressi\u00f3. Aquests additius s\u00f3n no t\u00f2xics, altament efectius en baixes concentracions i compatibles amb una \u00e0mplia gamma de sistemes aquosos i a base de dissolvents.<\/p>\n

Els additius de silicona de baix pes molecular s\u00f3n especialment efectius per prevenir defectes superficials comuns, com cr\u00e0ters i ulls de peix. Tamb\u00e9 milloren el nivellat i redueixen significativament la tensi\u00f3 superficial, fent-los ideals per a formulacions aquoses o superf\u00edcies dif\u00edcils d\u2019humectar. Aquests additius s\u00f3n habitualment utilitzats en sistemes que requereixen l’aplicaci\u00f3 de m\u00faltiples capes de recobriments.<\/p>\n

Els additius de pes molecular mitj\u00e0 i alt tamb\u00e9 s\u00f3n importants en la prevenci\u00f3 de defectes superficials, tot i que el seu impacte en la tensi\u00f3 superficial \u00e9s moderat. Aquests additius milloren el flux i el nivellat de la formulaci\u00f3 en general. A m\u00e9s, modifiquen les propietats superficials, augmentant la brillantor, millorant el deslli\u00e7ament i incrementant la resist\u00e8ncia a l’abrasi\u00f3. Els defectes superficials en els recobriments sovint tenen el seu origen en les difer\u00e8ncies de tensi\u00f3 superficial entre materials. Per a una humectaci\u00f3 efectiva, la tensi\u00f3 superficial del l\u00edquid ha de ser inferior a l\u2019energia superficial del substrat. Aix\u00f2 garanteix una bona adhesi\u00f3 i una cobertura sense defectes. Altres problemes superficials, com l’efecte de pell de taronja, s\u00f3n causats per l’evaporaci\u00f3 del dissolvent o el proc\u00e9s de curat del recobriment, que crea desequilibris de tensi\u00f3 superficial.<\/p>\n

TENSI\u00d3 SUPERFICIAL<\/p>\n

La tensi\u00f3 superficial \u00e9s l’energia necess\u00e0ria per augmentar la superf\u00edcie d’un l\u00edquid en una \u00e0rea determinada, resultat de les forces intermoleculars entre les mol\u00e8cules de la superf\u00edcie del l\u00edquid. Els l\u00edquids amb forces intermoleculars fortes presenten una tensi\u00f3 superficial elevada.<\/p>\n

Hi ha diversos m\u00e8todes per mesurar la tensi\u00f3 superficial, un dels m\u00e9s comuns \u00e9s l’anell de Du No\u00fcy, que mesura la tensi\u00f3 superficial est\u00e0tica del l\u00edquid. No obstant aix\u00f2, en processos din\u00e0mics com el recobriment amb corrons o la impressi\u00f3, \u00e9s m\u00e9s \u00fatil mesurar la tensi\u00f3 superficial din\u00e0mica. Aix\u00f2 es pot aconseguir amb el m\u00e8tode de pressi\u00f3 de bombolla, on es generen bombolles a diferents freq\u00fc\u00e8ncies dins d\u2019un l\u00edquid, i la pressi\u00f3 necess\u00e0ria per formar les bombolles est\u00e0 directament relacionada amb la tensi\u00f3 superficial del l\u00edquid.<\/p>\n

Tanmateix, en pres\u00e8ncia de tensioactius, la tensi\u00f3 superficial dep\u00e8n de la velocitat amb qu\u00e8 les mol\u00e8cules del tensioactiu es desplacen cap a la nova superf\u00edcie creada, per tant, la tensi\u00f3 superficial din\u00e0mica varia segons la vida \u00fatil de la bombolla. A Concentrol, els nostres laboratoris de R+D estan equipats amb tensi\u00f2metres de pressi\u00f3 de bombolla avan\u00e7ats, capa\u00e7os de mesurar la tensi\u00f3 superficial din\u00e0mica des de 15 mil\u00b7lisegons fins
\na 100 segons. Aquest equip ens permet observar el comportament dels diferents agents humectants i predir el seu rendiment en diversos sistemes de recobriment, ajudant al desenvolupament d\u2019additius innovadors.<\/p>\n

Consideracions normatives- Additius lliures de SVHC<\/h3>\n

Des de juny de 2018 (ED\/61\/2018), els additius de silicona que continguin m\u00e9s del 0,1% de silicones c\u00edcliques D4, D5 o D6 han de ser declarats com a subst\u00e0ncies de molt alta preocupaci\u00f3 (SVHC) a les fitxes de dades de
\nseguretat europees. Concentrol ofereix additius de superf\u00edcie de silicona amb nivells redu\u00efts de silicones c\u00edcliques, gr\u00e0cies a una etapa addicional de purificaci\u00f3 en el proc\u00e9s de producci\u00f3. Aquest proc\u00e9s assegura que els nostres additius continguin menys del 0,1% de D4,D5 i D6, per la qual cosa la nostra gamma ORDISOL no requereix etiquetatge com a SVHC.<\/p>\n

A m\u00e9s, la majoria dels nostres additius de silicona compleixen amb les normatives de contacte amb aliments de la FDA, i molts d\u2019ells tamb\u00e9 compleixen amb el Cap\u00edtol XV de BfR i el Reglament (UE) N\u00ba 10\/2011.<\/p>\n

Recerca i desenvolupament en additius de superficie de silicona<\/h3>\n

La fam\u00edlia ORDISOL<\/strong> ofereix una \u00e0mplia gamma d\u2019additius de superf\u00edcie de silicona, proporcionant solucions \u00f2ptimes per als formuladors que busquen millorar les propietats superficials dels seus productes. Aquests additius s\u00f3n silicones organofuncionals compostes de copol\u00edmers no hidrolitzables de polisilox\u00e0 i poli\u00e8ter, assegurant una excel\u00b7lent estabilitat en condicions extremes, com temperatures elevades o ambients corrosius. Aquesta l\u00ednea de productes es divideix en dues categories principals:<\/p>\n

    \n
  • Additius d’humectaci\u00f3 de substrats i anticr\u00e0ters (ORDISOL SWT)<\/strong><\/li>\n
  • Additius de control de superf\u00edcie (ORDISOL SLP)<\/strong><\/li>\n<\/ul>\n

    ADDITIUS D’HUMECTACI\u00d3 DE SUBSTRATS I ANTICR\u00c0TERS (ORDISOL SWT)<\/p>\n

    Estan dissenyats espec\u00edficament per a tintes d\u2019impressi\u00f3 i sistemes a base d\u2019aigua, on \u00e9s necessari reduir dr\u00e0sticament la tensi\u00f3 superficial. En aquests recobriments, la tensi\u00f3 superficial elevada de l\u2019aigua dificulta la humectaci\u00f3. Concentrol ofereix additius capa\u00e7os de reduir la tensi\u00f3 superficial de l\u2019aigua a prop de 20 mN\/m, millorant significativament el nivellat i reduint els cr\u00e0ters en superf\u00edcies contaminades. Recentment, s’han afegit dos nous productes a aquesta gamma:<\/p>\n

      \n
    • ORDISOL SWT-28<\/strong>. Desenvolupat per a sistemes aquosos, tintes d’impressi\u00f3 i vernissos d’impressi\u00f3<\/strong>. Ofereix una reducci\u00f3 forta de la tensi\u00f3 superficial mentre millora la humectaci\u00f3 i el nivellat. \u00c9s adequat per a sistemes sense cosolvents org\u00e0nics.<\/li>\n
    • ORDISOL SWT-49.<\/strong> Disenyat per a sistemes aquosos i adhesius<\/strong>. Aquest additiu millora el nivellat i el flux, redueix la tensi\u00f3 superficial i genera molt poca espuma en tots els sistemes.<\/li>\n<\/ul>\n

      ADDITIUS DE CONTROL DE SUPERFICIE (ORDISOL SLP)<\/p>\n

      \u00c9s ideal tant per a sistemes de base solvent, co-solvent com per a sistemes aquosos. Aquests additius milloren el nivellat, el flux i la resist\u00e8ncia als cr\u00e0ters, a m\u00e9s de modificar les propietats superficials, millorant caracter\u00edstiques mec\u00e0niques com la resist\u00e8ncia a les ratllades o l’abrasi\u00f3.<\/p>\n

      Un recent afegit a aquesta gamma \u00e9s ORDISOL SLP-35,<\/strong> un additiu universal que proporciona un bon efecte anticr\u00e0ter i millora el deslli\u00e7ament superficial. Tamb\u00e9 augmenta la resist\u00e8ncia a les ratllades i incrementa la brillantor, amb un lleuger efecte desespumant, estabilitzant molt menys l\u2019escuma que altres additius de copol\u00edmers de polisilox\u00e0 i poli\u00e8ter.<\/p>\n

      Concentrol es compromet a oferir la soluci\u00f3 ideal per a cada client. El nostre departament de desenvolupament experimenta constantment amb formulacions innovadores, assegurant que continuem sent l\u00edders en la ind\u00fastria qu\u00edmica, reconeguts com una empresa capdavantera.<\/p>\n

       <\/p>\n

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      [vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb703790″] Introducci\u00f3 Els additius de superficie de silicona s\u00f3n essencials en moltes aplicacions industrials, com la formulaci\u00f3 de pintures, […]<\/p>\n","protected":false},"author":35,"featured_media":159790,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[189],"tags":[137,808,732],"class_list":["post-159655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-additives-en-2","tag-automocio","tag-concentrol-ca","tag-polyurethane-ca"],"acf":[],"yoast_head":"\nAdditius de superficie de silicona. 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