{"id":6124,"date":"2023-05-30T06:49:41","date_gmt":"2023-05-30T06:49:41","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=6124"},"modified":"2026-04-28T10:42:18","modified_gmt":"2026-04-28T10:42:18","slug":"nucleating-agent","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/nucleating-agent\/","title":{"rendered":"agente de nuclea\u00e7\u00e3o"},"content":{"rendered":"<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> In practical UV formulation work, resin and monomer selection starts with the end-use property target, then tunes viscosity and cure response around it. Buyers usually shortlist a few matched packages, not a single magic raw material.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>Defini\u00e7\u00e3o de agente nucleante<\/p>\n<p>O agente nucleante \u00e9 um novo aditivo funcional aplicado ao polietileno, ao polipropileno e a outros pl\u00e1sticos com cristaliza\u00e7\u00e3o incompleta para encurtar o ciclo de moldagem, melhorar a transpar\u00eancia, a resist\u00eancia \u00e0 tra\u00e7\u00e3o, a rigidez, a tenacidade e outras propriedades f\u00edsicas e mec\u00e2nicas dos produtos, alterando o comportamento de cristaliza\u00e7\u00e3o da resina, acelerando a taxa de cristaliza\u00e7\u00e3o, aumentando a densidade de cristaliza\u00e7\u00e3o e promovendo a microfabrica\u00e7\u00e3o do tamanho do gr\u00e3o.<\/p>\n<p>&nbsp;<\/p>\n<p>Mecanismo de a\u00e7\u00e3o do agente nucleante (produtos PP)<\/p>\n<p>Quando o agente de nuclea\u00e7\u00e3o \u00e9 adicionado ao pl\u00e1stico, as part\u00edculas do agente de nuclea\u00e7\u00e3o desempenham o papel de n\u00facleos de cristal, ou seja, mais n\u00facleos s\u00e3o adicionados externamente, o que proporciona um bom foco para a cristaliza\u00e7\u00e3o de pl\u00e1sticos, promovendo assim a cristaliza\u00e7\u00e3o.<\/p>\n<p>Em geral, as part\u00edculas do agente de nuclea\u00e7\u00e3o devem ter uma rela\u00e7\u00e3o de aspecto suficiente. No entanto, os agentes nucleantes em geral tendem a induzir uma orienta\u00e7\u00e3o de cristaliza\u00e7\u00e3o forte e anisotr\u00f3pica dentro do material, especialmente na dire\u00e7\u00e3o longitudinal versus transversal (MD\/TD) de pe\u00e7as planas. Essa contra\u00e7\u00e3o diferente e a orienta\u00e7\u00e3o desequilibrada podem ser reveladas ainda mais em alguns processos, como a forma\u00e7\u00e3o de press\u00e3o em fase s\u00f3lida (SPPF), que pode causar empenamento ap\u00f3s a moldagem.<\/p>\n<p>Portanto, um bom agente de nuclea\u00e7\u00e3o deve ser capaz de obter uma orienta\u00e7\u00e3o cristalina equilibrada nos planos longitudinal e transversal da pe\u00e7a de PP, proporcionando, assim, excelente estabilidade dimensional e reduzindo os problemas de empenamento e encolhimento.<\/p>\n<p>Classifica\u00e7\u00e3o dos agentes nucleantes comuns<\/p>\n<p>(1) Agente de nuclea\u00e7\u00e3o alfa cristalino:<\/p>\n<p>Melhoram principalmente a transpar\u00eancia, o brilho da superf\u00edcie, a rigidez e a temperatura de deflex\u00e3o t\u00e9rmica do produto, e tamb\u00e9m s\u00e3o conhecidos como agente transparente, intensificador de permeabilidade e intensificador de rigidez. Incluindo principalmente sorbitol bifurcado (DBS) e seus derivados, sais de fosfato arom\u00e1tico, substitui\u00e7\u00e3o de sais de \u00e1cido benzoico etc., especialmente a aplica\u00e7\u00e3o do agente transparente de nuclea\u00e7\u00e3o DBS \u00e9 a mais comum.<\/p>\n<p>Os agentes nucleantes alfa-cristalinos podem ser divididos em inorg\u00e2nicos e org\u00e2nicos de acordo com a estrutura.<\/p>\n<p>(1) Classe inorg\u00e2nica<\/p>\n<p>Os agentes nucleantes inorg\u00e2nicos incluem principalmente talco, \u00f3xido de c\u00e1lcio, negro de fumo, carbonato de c\u00e1lcio, mica, pigmentos inorg\u00e2nicos, caulim e res\u00edduos de catalisadores. Esses s\u00e3o os primeiros agentes nucleantes desenvolvidos, baratos e pr\u00e1ticos; os mais pesquisados e aplicados s\u00e3o o talco, a mica etc.<\/p>\n<p>(2) Org\u00e2nico<\/p>\n<p>(a) sais met\u00e1licos de \u00e1cido carbox\u00edlico: como succinato de s\u00f3dio, glutarato de s\u00f3dio, hexanoato de s\u00f3dio, benzoato de pot\u00e1ssio, benzoato de l\u00edtio, cinamato de s\u00f3dio, \u03b2-naftoato de s\u00f3dio, etc. Entre eles, o sal de alum\u00ednio ou metal alcalino do \u00e1cido benzoico, o sal de alum\u00ednio do \u00e1cido terc-butil benzoico etc. O efeito \u00e9 melhor, o hist\u00f3rico de uso \u00e9 mais longo, mas a transpar\u00eancia \u00e9 ruim.<\/p>\n<p>(b) Sais met\u00e1licos de fosfato: os fosfatos org\u00e2nicos incluem principalmente sais met\u00e1licos de \u00e9ster de fosfato e subst\u00e2ncias met\u00e1licas alcalinas de \u00e9ster de fosfato e seus complexos, etc. Esse tipo de agente nucleante \u00e9 caracterizado por transpar\u00eancia, rigidez, velocidade de cristaliza\u00e7\u00e3o, etc., mas dispers\u00e3o ruim.<\/p>\n<p>(c) derivados de forquilha de sorbitol benz\u00edlico: a transpar\u00eancia, o brilho da superf\u00edcie, a rigidez e outras propriedades termomec\u00e2nicas dos produtos t\u00eam um efeito de melhoria significativo e t\u00eam boa compatibilidade com PP, \u00e9 uma classe de agente de nuclea\u00e7\u00e3o transparente que est\u00e1 sendo estudada em profundidade. Seu bom desempenho e baixo pre\u00e7o tornaram-se o desenvolvimento mais ativo no pa\u00eds e no exterior, a maioria das variedades, a maior produ\u00e7\u00e3o e vendas de uma classe de agentes nucleantes. H\u00e1 principalmente dibenzil bifurca\u00e7\u00e3o de sorbitol (DBS), dois (para uma bifurca\u00e7\u00e3o de metil benzil) sorbitol (P-M-DBS), etc.<\/p>\n<p>(d) Agente nucleante do tipo pol\u00edmero de alto ponto de fus\u00e3o: atualmente, h\u00e1 principalmente polivinilciclohexano, polivinilpentano, copol\u00edmero de etileno\/acrilato, etc. Ele \u00e9 pouco misc\u00edvel com a resina de poliolefina e tem boa dispers\u00e3o.<\/p>\n<p>(2) Agente de nuclea\u00e7\u00e3o de cristais \u03b2<\/p>\n<p>Eles s\u00e3o projetados para obter produtos de polipropileno com alto conte\u00fado \u03b2-cristalino e t\u00eam a vantagem de melhorar a resist\u00eancia ao impacto dos produtos sem reduzir ou at\u00e9 mesmo aumentar a temperatura de deflex\u00e3o t\u00e9rmica dos produtos, de modo que os dois aspectos conflitantes de resist\u00eancia ao impacto e deflex\u00e3o t\u00e9rmica possam ser equilibrados.<\/p>\n<p>Um grupo \u00e9 um pequeno n\u00famero de compostos de an\u00e9is espessos com estruturas quase planas.<\/p>\n<p>O outro grupo \u00e9 composto por determinados \u00e1cidos dicarbox\u00edlicos com \u00f3xidos, hidr\u00f3xidos e sais de metais do grupo IIA da tabela peri\u00f3dica. Ele pode modificar o PP alterando a propor\u00e7\u00e3o de diferentes formas cristalinas no pol\u00edmero.<\/p>\n<p>&nbsp;<\/p>\n<p>A adi\u00e7\u00e3o de um agente de nuclea\u00e7\u00e3o tem os seguintes efeitos<\/p>\n<p>1\u3001Curta o ciclo de moldagem do PP<\/p>\n<p>A adi\u00e7\u00e3o de agente nucleante pode aumentar a temperatura de recristaliza\u00e7\u00e3o do polipropileno, acelerar a taxa de cristaliza\u00e7\u00e3o e concluir a cristaliza\u00e7\u00e3o em um curto per\u00edodo de resfriamento. A adi\u00e7\u00e3o de 0,2% de RQT-CH pode encurtar o ciclo de moldagem do PP em 7s e aumentar a efici\u00eancia de trabalho em 14%, o que \u00e9 muito significativo para produtos de moldagem por inje\u00e7\u00e3o em larga escala.<\/p>\n<p>2\u3001Melhorar as propriedades mec\u00e2nicas do PP<\/p>\n<p>A densidade da fase cristalina do polipropileno cristalino \u00e9 maior do que a da fase n\u00e3o cristalina e tem excelente resist\u00eancia. Sem o agente de nuclea\u00e7\u00e3o, os pol\u00edmeros cristalinos geram cristais durante o resfriamento no estado fundido, que \u00e9 a cristaliza\u00e7\u00e3o autom\u00e1tica. Esse cristal esf\u00e9rico n\u00e3o \u00e9 uniforme, \u00e9 incompleto, portanto, quando a for\u00e7a entre a parte cristalina da interface do cristal esf\u00e9rico e a parte n\u00e3o cristalina, a lacuna entre os gr\u00e3os quebrados \u00e9 a primeira a ser destru\u00edda; Ao adicionar o agente de nuclea\u00e7\u00e3o, o crescimento do cristal esf\u00e9rico pode ser controlado, de modo que o n\u00facleo aumente, a cristaliza\u00e7\u00e3o seja mais perfeita, a for\u00e7a seja mais uniforme e, assim, seja poss\u00edvel melhorar a resist\u00eancia ao escoamento do pol\u00edmero. Portanto, \u00e9 poss\u00edvel melhorar a resist\u00eancia ao escoamento, a resist\u00eancia ao impacto e a resist\u00eancia da superf\u00edcie do pol\u00edmero e melhorar as propriedades mec\u00e2nicas do polipropileno.<\/p>\n<p>3\u3001Aumentar a transpar\u00eancia e o brilho da superf\u00edcie do PP. Como o PP no processo de derretimento e resfriamento, o n\u00famero de n\u00facleos de cristaliza\u00e7\u00e3o espont\u00e2nea \u00e9 muito pequeno, a taxa de cristaliza\u00e7\u00e3o \u00e9 lenta, f\u00e1cil de formar grandes cristais esf\u00e9ricos, o di\u00e2metro desses cristais esf\u00e9ricos \u00e9 muito maior do que o comprimento de onda vis\u00edvel e a diferen\u00e7a de \u00edndice de refra\u00e7\u00e3o entre o cristal e as \u00e1reas amorfas \u00e9 grande, resultando na dispers\u00e3o da luz da superf\u00edcie, resultando em uma diminui\u00e7\u00e3o da transpar\u00eancia, de modo que a maioria dos produtos de polipropileno fabricados em condi\u00e7\u00f5es normais de processamento s\u00e3o transl\u00facidos. Um produto com boa transpar\u00eancia deve atender aos requisitos de alta cristalinidade, orienta\u00e7\u00e3o cristalina perfeita e tamanho cristalino menor que o comprimento de onda da luz vis\u00edvel. Para obter a cristaliza\u00e7\u00e3o esf\u00e9rica microfina necess\u00e1ria do polipropileno, a adi\u00e7\u00e3o de agentes nucleantes \u00e9 um m\u00e9todo extremamente competitivo [8].<\/p>\n<p>4. Efeito nas propriedades t\u00e9rmicas<\/p>\n<p>A adi\u00e7\u00e3o de agentes nucleantes aumenta a temperatura de cristaliza\u00e7\u00e3o, acelera a cristaliza\u00e7\u00e3o, melhora o grau de cristaliza\u00e7\u00e3o, aumenta a densidade e aumenta a temperatura de deflex\u00e3o t\u00e9rmica, o que pode melhorar a resist\u00eancia t\u00e9rmica da resina at\u00e9 certo ponto.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>How buyers usually evaluate UV monomers and resin systems<\/h2>\n<p>Most successful UV formulations are built by choosing the backbone first and then tuning the reactive monomer package around the substrate, cure method, and end-use stress. That usually produces a more stable result than choosing materials by viscosity or price alone.<\/p>\n<ul>\n<li><strong>Start from the final property target:<\/strong> hardness, flexibility, adhesion, and shrinkage rarely point to exactly the same raw-material package.<\/li>\n<li><strong>Screen the reactive package as a whole:<\/strong> oligomer, monomer, and photoinitiator choices interact strongly in UV systems.<\/li>\n<li><strong>Use viscosity as a tool, not the only decision rule:<\/strong> the easiest-processing material is not always the one that performs best after cure.<\/li>\n<li><strong>Check the real substrate:<\/strong> plastic, metal, label film, gel systems, and coatings can reward very different polarity and cure-density balances.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/hpma-monomer-cas-27813-02-1\/\">CHLUMICRYL HPMA<\/a>:<\/strong> Useful when more polarity and adhesion support are needed in the reactive package.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/iboa-monomer-cas-5888-33-5\/\">CHLUMICRYL IBOA<\/a>:<\/strong> A strong low-viscosity monomer reference when hardness and good flow both matter.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/tmpta-cas-15625-89-5\/\">CHLUMICRYL TMPTA<\/a>:<\/strong> A standard reactive monomer benchmark when stronger crosslink density is required.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/eo3-tmpta-cas-28961-43-5\/\">CHLUMICRYL EO3-TMPTA<\/a>:<\/strong> Helpful when viscosity and cure behavior need to be tuned around the base package.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Can one UV monomer or resin solve every formulation problem?<\/strong><br \/>Usually no. Commercially strong formulas depend on how several components work together to balance cure, adhesion, flow, and durability.<\/p>\n<p><strong>Why should monomers be screened together with oligomers?<\/strong><br \/>Because monomers can change viscosity, cure rate, shrinkage, and substrate behavior enough to alter the final ranking of the same backbone resin.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>Definition of nucleating agent Nucleating agent is a new functional additive applied to polyethylene, polypropylene and other incompletely crystallized plastics to shorten molding cycle, improve transparency, tensile strength, rigidity, toughness<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-6124","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>nucleating agent - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"Definition of nucleating agent Nucleating agent is a new functional additive applied to polyethylene, polypropylene and other incompletely crystallized...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/pt\/nucleating-agent\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"nucleating agent - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"Definition of nucleating agent Nucleating agent is a new functional additive applied to polyethylene, polypropylene and other incompletely crystallized...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/longchangchemical.com\/pt\/nucleating-agent\/\" \/>\n<meta property=\"og:site_name\" content=\"Longchang Chemical\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-30T06:49:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-28T10:42:18+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2024\/02\/logo-jpeg.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Longchang Chemical\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/longchangchemical.com\/nucleating-agent\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/longchangchemical.com\/nucleating-agent\/\"},\"author\":{\"name\":\"Longchang Chemical\",\"@id\":\"https:\/\/longchangchemical.com\/#\/schema\/person\/ecb1ad846136c6f1ca534b62978c6a8e\"},\"headline\":\"nucleating agent\",\"datePublished\":\"2023-05-30T06:49:41+00:00\",\"dateModified\":\"2026-04-28T10:42:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/longchangchemical.com\/nucleating-agent\/\"},\"wordCount\":1305,\"publisher\":{\"@id\":\"https:\/\/longchangchemical.com\/#organization\"},\"articleSection\":[\"Catalysts &amp; 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