{"id":15764,"date":"2024-04-16T08:03:29","date_gmt":"2024-04-16T08:03:29","guid":{"rendered":"http:\/\/quartz-grinding.com\/?p=15764"},"modified":"2024-04-16T08:03:32","modified_gmt":"2024-04-16T08:03:32","slug":"the-surface-modification-effect-of-silica-powder-will-determine-its-quality","status":"publish","type":"post","link":"https:\/\/www.quartz-grinding.com\/pt\/the-surface-modification-effect-of-silica-powder-will-determine-its-quality\/","title":{"rendered":"O efeito de modifica\u00e7\u00e3o da superf\u00edcie do p\u00f3 de s\u00edlica determinar\u00e1 sua qualidade"},"content":{"rendered":"<p>O pr\u00f3prio p\u00f3 de s\u00edlica \u00e9 uma subst\u00e2ncia polar e hidrof\u00edlica. Possui diferentes propriedades de interface com a matriz polim\u00e9rica e tem baixa compatibilidade. Muitas vezes \u00e9 dif\u00edcil dispersar no material de base. Portanto, geralmente \u00e9 necess\u00e1ria a modifica\u00e7\u00e3o da superf\u00edcie do p\u00f3 de s\u00edlica. Alterar propositalmente as propriedades f\u00edsicas e qu\u00edmicas da superf\u00edcie do p\u00f3 de s\u00edlica de acordo com as necessidades da aplica\u00e7\u00e3o, melhorando assim sua compatibilidade com materiais polim\u00e9ricos org\u00e2nicos e atendendo aos seus requisitos de dispers\u00e3o e fluidez em materiais polim\u00e9ricos.<br>\u200b<br>Fatores como a qualidade da mat\u00e9ria-prima do p\u00f3 de s\u00edlica, processo de modifica\u00e7\u00e3o, m\u00e9todo e modificador de modifica\u00e7\u00e3o de superf\u00edcie, dosagem do modificador, condi\u00e7\u00f5es do processo de modifica\u00e7\u00e3o (temperatura de modifica\u00e7\u00e3o, tempo, pH e velocidade de agita\u00e7\u00e3o) afetam o efeito de modifica\u00e7\u00e3o de superf\u00edcie do p\u00f3 de s\u00edlica. Entre eles, os m\u00e9todos e modificadores de modifica\u00e7\u00e3o de superf\u00edcie s\u00e3o os principais fatores que afetam o efeito de modifica\u00e7\u00e3o.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"710\" height=\"710\" src=\"http:\/\/quartz-grinding.com\/wp-content\/uploads\/2024\/04\/quartz-sand.webp\" alt=\"areia de quartzo\" class=\"wp-image-15766\" srcset=\"https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/04\/quartz-sand.webp 710w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/04\/quartz-sand-100x100.webp 100w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/04\/quartz-sand-300x300.webp 300w\" sizes=\"(max-width: 710px) 100vw, 710px\" \/><figcaption class=\"wp-element-caption\">areia de quartzo<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-silica-powder-raw-material-quality\">Qualidade da mat\u00e9ria-prima em p\u00f3 de s\u00edlica<\/h2>\n\n\n\n<p>O tipo, tamanho de part\u00edcula, \u00e1rea superficial espec\u00edfica, grupos funcionais de superf\u00edcie e outras propriedades do p\u00f3 de s\u00edlica afetam diretamente sua combina\u00e7\u00e3o com modificadores de superf\u00edcie. Os efeitos de modifica\u00e7\u00e3o dos diferentes tipos de p\u00f3 de s\u00edlica tamb\u00e9m s\u00e3o diferentes. Dentre eles, o p\u00f3 de s\u00edlica esf\u00e9rica possui boa fluidez, \u00e9 f\u00e1cil de combinar com o modificador durante o processo de modifica\u00e7\u00e3o e pode ser melhor disperso no sistema polim\u00e9rico org\u00e2nico. E a densidade, dureza, constante diel\u00e9trica e outras propriedades s\u00e3o significativamente melhores do que o p\u00f3 de s\u00edlica angular.<br>\u200b<br>Por exemplo, Huang Weizhuang et al. estudaram os efeitos de diferentes tipos de p\u00f3 de s\u00edlica na resist\u00eancia ao calor de laminados revestidos de cobre. Eles usaram p\u00f3 de s\u00edlica amorfa, p\u00f3 de s\u00edlica cristalina quase esf\u00e9rica e p\u00f3 de s\u00edlica fundida esf\u00e9rica como enchimentos para preparar laminados revestidos de cobre e mediram a resist\u00eancia t\u00e9rmica dos laminados revestidos de cobre. Resist\u00eancia ao calor e propriedades de interface. Os resultados mostram que o p\u00f3 de s\u00edlica esf\u00e9rico \u00e9 melhor compat\u00edvel com a resina ep\u00f3xi, e o laminado revestido de cobre preparado tem melhor resist\u00eancia ao calor.<br>\u200b<br>Geralmente, quanto menor o tamanho da part\u00edcula do p\u00f3 de s\u00edlica, maior a \u00e1rea superficial espec\u00edfica, mais s\u00edtios ativos na superf\u00edcie e a quantidade de modificador utilizado tamb\u00e9m aumentar\u00e1. Al\u00e9m disso, o p\u00f3 de s\u00edlica com diferentes tamanhos de part\u00edculas tamb\u00e9m tem um certo impacto no desempenho dos produtos a jusante durante o processo de aplica\u00e7\u00e3o. Por exemplo, ao misturar p\u00f3 de s\u00edlica com resina, a distribui\u00e7\u00e3o do tamanho das part\u00edculas deve ser rigorosamente controlada e n\u00e3o deve ser muito grande ou muito pequena. Se o tamanho das part\u00edculas for muito grande, o desempenho da aplica\u00e7\u00e3o de enchimento ser\u00e1 fraco, enquanto que se o tamanho das part\u00edculas for muito pequeno, a viscosidade do sistema de resina aumentar\u00e1 e a fluidez se deteriorar\u00e1. .<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-surface-modification-methods-and-modifiers\">M\u00e9todos e modificadores de modifica\u00e7\u00e3o de superf\u00edcie<\/h2>\n\n\n\n<p>Atualmente, os m\u00e9todos de modifica\u00e7\u00e3o superficial do p\u00f3 de s\u00edlica s\u00e3o principalmente modifica\u00e7\u00e3o org\u00e2nica, modifica\u00e7\u00e3o inorg\u00e2nica e modifica\u00e7\u00e3o mecanoqu\u00edmica, entre os quais o m\u00e9todo de modifica\u00e7\u00e3o mais comumente usado \u00e9 a modifica\u00e7\u00e3o org\u00e2nica. Quando o efeito de modifica\u00e7\u00e3o \u00fanica n\u00e3o \u00e9 bom, voc\u00ea pode considerar combinar a modifica\u00e7\u00e3o org\u00e2nica com outros m\u00e9todos de modifica\u00e7\u00e3o para modifica\u00e7\u00e3o composta.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-organic-modification\">Modifica\u00e7\u00e3o org\u00e2nica<\/h3>\n\n\n\n<p>A modifica\u00e7\u00e3o org\u00e2nica \u00e9 um m\u00e9todo que utiliza grupos funcionais na mat\u00e9ria org\u00e2nica para realizar adsor\u00e7\u00e3o f\u00edsica, adsor\u00e7\u00e3o qu\u00edmica e rea\u00e7\u00f5es qu\u00edmicas na superf\u00edcie do p\u00f3 de s\u00edlica para alterar as propriedades superficiais do p\u00f3 de s\u00edlica. Atualmente, os modificadores org\u00e2nicos mais comumente usados s\u00e3o os agentes de acoplamento de silano, que incluem principalmente amino, ep\u00f3xi, vinil, sulfeto e outros tipos. O efeito da modifica\u00e7\u00e3o geralmente \u00e9 bom, mas o pre\u00e7o \u00e9 caro. Alguns pesquisadores usam modificadores relativamente baratos, como aluminato, titanato e \u00e1cido este\u00e1rico para modificar o p\u00f3 de s\u00edlica, mas o efeito de modifica\u00e7\u00e3o muitas vezes n\u00e3o \u00e9 t\u00e3o bom quanto o dos agentes de acoplamento de silano. Portanto, combinando benef\u00edcios econ\u00f4micos e efeitos de modifica\u00e7\u00e3o, usando Quando dois ou mais modificadores de superf\u00edcie s\u00e3o usados para modificar compostamente o p\u00f3 de s\u00edlica, o efeito de modifica\u00e7\u00e3o \u00e9 frequentemente mais ideal do que usar um \u00fanico modificador.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-inorganic-modification\">Modifica\u00e7\u00e3o inorg\u00e2nica<\/h3>\n\n\n\n<p>A modifica\u00e7\u00e3o inorg\u00e2nica refere-se ao revestimento ou composi\u00e7\u00e3o de metais, \u00f3xidos inorg\u00e2nicos, hidr\u00f3xidos, etc. na superf\u00edcie do p\u00f3 de s\u00edlica para dar novas fun\u00e7\u00f5es ao material. Por exemplo, Oyama et al. usou um m\u00e9todo de precipita\u00e7\u00e3o para cobrir a superf\u00edcie do SiO2 com Al(OH)3 e, em seguida, envolveu o SiO2 modificado com polidivinilbenzeno para atender a certos requisitos especiais de aplica\u00e7\u00e3o.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mechanochemical-modification\">Modifica\u00e7\u00e3o mecanoqu\u00edmica<\/h3>\n\n\n\n<p>A modifica\u00e7\u00e3o mecanoqu\u00edmica refere-se primeiro ao uso de moagem ultrafina e outras for\u00e7as mec\u00e2nicas fortes para ativar a superf\u00edcie das part\u00edculas de p\u00f3 para aumentar pontos ativos ou grupos ativos na superf\u00edcie do p\u00f3 de s\u00edlica e, em seguida, combinar modificadores para obter a modifica\u00e7\u00e3o composta do p\u00f3 de s\u00edlica.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-modifier-dosage\">Dosagem modificadora<\/h2>\n\n\n\n<p>A quantidade de modificador est\u00e1 geralmente relacionada ao n\u00famero de pontos ativos (como Si-OH) na superf\u00edcie do p\u00f3 de s\u00edlica e \u00e0 camada monomolecular e \u00e0 espessura bimolecular do modificador que cobre a superf\u00edcie. Quando a quantidade de modificador \u00e9 muito pequena, o grau de ativa\u00e7\u00e3o da superf\u00edcie do p\u00f3 de s\u00edlica modificado n\u00e3o ser\u00e1 alto; quando a quantidade de modificador \u00e9 muito grande, n\u00e3o s\u00f3 aumentar\u00e1 o custo da modifica\u00e7\u00e3o, mas tamb\u00e9m formar\u00e1 uma camada f\u00edsica multicamadas na superf\u00edcie do p\u00f3 de s\u00edlica modificado. A adsor\u00e7\u00e3o faz com que a interface entre o p\u00f3 de s\u00edlica e o pol\u00edmero org\u00e2nico forme uma camada fraca, resultando na incapacidade de funcionar como uma ponte de mol\u00e9cula \u00fanica.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-modification-process-and-condition-optimization\">Processo de modifica\u00e7\u00e3o e otimiza\u00e7\u00e3o de condi\u00e7\u00f5es<\/h2>\n\n\n\n<p>Os processos de modifica\u00e7\u00e3o comumente usados para p\u00f3 de s\u00edlica incluem principalmente modifica\u00e7\u00e3o a seco, modifica\u00e7\u00e3o a \u00famido e modifica\u00e7\u00e3o de comp\u00f3sito.<\/p>\n\n\n\n<p>(1) A modifica\u00e7\u00e3o a seco \u00e9 uma modifica\u00e7\u00e3o na qual o p\u00f3 de s\u00edlica \u00e9 disperso no equipamento de modifica\u00e7\u00e3o em um estado relativamente seco e combinado com uma certa quantidade de modificador de superf\u00edcie a uma determinada temperatura. O processo de modifica\u00e7\u00e3o a seco \u00e9 simples e tem baixo custo de produ\u00e7\u00e3o. Atualmente \u00e9 o principal m\u00e9todo de modifica\u00e7\u00e3o da superf\u00edcie do p\u00f3 de s\u00edlica dom\u00e9stico e \u00e9 adequado para p\u00f3 de s\u00edlica em n\u00edvel de m\u00edcron.<br>\u200b<br>(2) A modifica\u00e7\u00e3o \u00famida refere-se a molhar a superf\u00edcie do p\u00f3 de sil\u00edcio sob condi\u00e7\u00f5es de fase l\u00edquida para reduzir a energia de liga\u00e7\u00e3o da superf\u00edcie e, em seguida, adicionar uma certa quantidade de modificadores de superf\u00edcie e aditivos, agitando e dispersando a uma determinada temperatura, para obter superf\u00edcie de sil\u00edcio modifica\u00e7\u00e3o de microp\u00f3s. O processo de modifica\u00e7\u00e3o \u00famida pode tornar o p\u00f3 de s\u00edlica e o modificador mais facilmente dispersos e combinados de forma mais completa, tornando a modifica\u00e7\u00e3o mais uniforme. No entanto, s\u00e3o necess\u00e1rias opera\u00e7\u00f5es subsequentes de desidrata\u00e7\u00e3o, o processo \u00e9 complexo e o consumo de energia \u00e9 elevado, sendo mais adequado para part\u00edculas ultrafinas com tamanho de part\u00edcula inferior a 5 \u03bcm. Modifica\u00e7\u00e3o de p\u00f3 de s\u00edlica. Al\u00e9m disso, a solubilidade em \u00e1gua do modificador tamb\u00e9m deve ser considerada durante o processo de modifica\u00e7\u00e3o \u00famida, pois somente modificadores com melhor solubilidade em \u00e1gua podem dispersar e interagir melhor com os grupos Si-OH na superf\u00edcie do p\u00f3 de s\u00edlica.<br>\u200b<br>(3) A modifica\u00e7\u00e3o do comp\u00f3sito refere-se \u00e0 combina\u00e7\u00e3o de processos de modifica\u00e7\u00e3o a seco e \u00famido para melhorar ainda mais o grau de ativa\u00e7\u00e3o do p\u00f3 de s\u00edlica. Por exemplo, Cao Jiakai et al. realizou modifica\u00e7\u00e3o em duas etapas atrav\u00e9s de processos seco e \u00famido. Ou seja, primeiro atrav\u00e9s da modifica\u00e7\u00e3o a seco, \u03b3-(2,3-epoxipropoxi)propiltrimetilsilano foi usado para conduzir a modifica\u00e7\u00e3o preliminar do p\u00f3 de s\u00edlica. Modifica\u00e7\u00e3o e, em seguida, por modifica\u00e7\u00e3o \u00famida, utilizando N-fenil-aminotrimetoxissilano para modifica\u00e7\u00e3o para obten\u00e7\u00e3o de microp\u00f3 de s\u00edlica ativa. Os resultados mostram que o p\u00f3 de s\u00edlica produzido pelo processo de modifica\u00e7\u00e3o do comp\u00f3sito possui alta atividade, boa hidrofobicidade, pequeno n\u00famero de grupos hidroxila superficiais e pode ser melhor disperso no sistema resinoso.<br>\u200b<br>Al\u00e9m disso, para obter um bom efeito de modifica\u00e7\u00e3o do p\u00f3 de s\u00edlica, a temperatura, o pH, o tempo, a velocidade de agita\u00e7\u00e3o e outras condi\u00e7\u00f5es do processo durante o processo de modifica\u00e7\u00e3o devem ser controlados.<br>\u200b<br>A temperatura de modifica\u00e7\u00e3o \u00e9 uma condi\u00e7\u00e3o importante para a condensa\u00e7\u00e3o, desidrata\u00e7\u00e3o e forma\u00e7\u00e3o de fortes liga\u00e7\u00f5es covalentes entre o modificador e o p\u00f3 de s\u00edlica. A temperatura de modifica\u00e7\u00e3o n\u00e3o deve ser muito alta ou muito baixa. Uma temperatura muito alta far\u00e1 com que o modificador se decomponha ou volatilize, e uma temperatura muito baixa far\u00e1 com que o modificador se decomponha ou volatilize. Isto reduzir\u00e1 a taxa de rea\u00e7\u00e3o entre o modificador e o p\u00f3 de s\u00edlica, afetando o efeito de modifica\u00e7\u00e3o.<\/p>\n\n\n\n<p>Para modificadores dissolvidos atrav\u00e9s de solventes, o pH afetar\u00e1 o efeito de hidr\u00f3lise. Um tempo de modifica\u00e7\u00e3o mais longo torna a intera\u00e7\u00e3o entre o modificador e o p\u00f3 de s\u00edlica mais completa e firme; uma velocidade de agita\u00e7\u00e3o adequada pode fazer com que o modificador e o p\u00f3 de s\u00edlica entrem em contato mais completamente e melhorem a dispers\u00e3o do modificador no p\u00f3 de s\u00edlica.<\/p>","protected":false},"excerpt":{"rendered":"<p>O pr\u00f3prio p\u00f3 de s\u00edlica \u00e9 uma subst\u00e2ncia polar e hidrof\u00edlica. Possui diferentes propriedades de interface com a matriz polim\u00e9rica e tem baixa compatibilidade. Muitas vezes \u00e9 dif\u00edcil se dispersar no [...]<\/p>","protected":false},"author":1,"featured_media":15766,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[42],"tags":[],"class_list":["post-15764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The surface modification effect of silica powder will determine its quality - Silica powder (ultrafine quartz powder) processing expert<\/title>\n<meta name=\"description\" content=\"Silica powder itself is a polar and hydrophilic substance. It has different interface properties with the polymer matrix and has poor compatibility.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.quartz-grinding.com\/pt\/the-surface-modification-effect-of-silica-powder-will-determine-its-quality\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The surface modification effect of silica powder will determine its quality - Silica powder (ultrafine quartz powder) processing expert\" \/>\n<meta property=\"og:description\" content=\"Silica powder itself is a polar and hydrophilic substance. 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