{"id":5342,"date":"2022-07-01T12:12:25","date_gmt":"2022-07-01T12:12:25","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5342"},"modified":"2026-04-28T10:42:02","modified_gmt":"2026-04-28T10:42:02","slug":"how-to-reduce-the-shrinkage-of-uv-glue","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/how-to-reduce-the-shrinkage-of-uv-glue\/","title":{"rendered":"Como reduzir o encolhimento da cola UV? Quais s\u00e3o os m\u00e9todos?"},"content":{"rendered":"<h1><strong>Como reduzir o encolhimento da cola UV? Quais s\u00e3o os m\u00e9todos?<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> In most UV systems, photoinitiators are selected by balancing wavelength fit, through-cure, color control, and line speed. Buyers usually compare a blended package instead of one isolated product.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>No processo de cura do adesivo UV, h\u00e1 um processo de gelifica\u00e7\u00e3o. Antes da gelifica\u00e7\u00e3o, o sistema ainda \u00e9 fluido, apesar do encolhimento, enquanto que, ap\u00f3s a gelifica\u00e7\u00e3o, o movimento molecular \u00e9 impedido e as rea\u00e7\u00f5es de cura adicionais s\u00e3o a principal causa da tens\u00e3o de encolhimento. Portanto, a tens\u00e3o de contra\u00e7\u00e3o n\u00e3o \u00e9 proporcional \u00e0 contra\u00e7\u00e3o volum\u00e9trica de todo o processo de cura. Em vez disso, ela depende do encolhimento volum\u00e9trico ap\u00f3s a gelifica\u00e7\u00e3o. Quanto mais altas forem as funcionalidades dos reagentes, menor ser\u00e1 o grau de rea\u00e7\u00e3o dos grupos funcionais quando ocorrer a gelifica\u00e7\u00e3o. Portanto, um sistema de rea\u00e7\u00e3o com um alto grau de funcionalidade produzir\u00e1 uma tens\u00e3o de encolhimento maior ap\u00f3s a cura.<\/p>\n<p>Maneiras de reduzir o encolhimento do adesivo UV<\/p>\n<p>1. Formula\u00e7\u00e3o de cola UV com o uso de mon\u00f4meros e olig\u00f4meros de baixa retra\u00e7\u00e3o<\/p>\n<p>In the UV glue formula, the use of low viscosity acrylate oligomer and less dilution monomer is also an effective way to reduce the shrinkage rate. Formulators often compare <a href=\"https:\/\/longchangchemical.com\/pt\/product\/iboa-monomer-cas-5888-33-5\/\">Mon\u00f4mero IBOA<\/a> for lower stress with <a href=\"https:\/\/longchangchemical.com\/pt\/product\/tmpta-cas-15625-89-5\/\">Mon\u00f4mero de TMPTA<\/a> for higher reactivity and crosslink density.<\/p>\n<p>2. Pol\u00edmero ou enchimento inorg\u00e2nico adicionado \u00e0 cola UV<\/p>\n<p>No m\u00e9todo de adi\u00e7\u00e3o de pol\u00edmeros, o sistema rec\u00e9m-gerado e os pol\u00edmeros pr\u00e9-adicionados entre a separa\u00e7\u00e3o de fases, que \u00e0s vezes ocorre durante o processo de cura, tamb\u00e9m podem compensar parte do encolhimento do volume. Entretanto, a desvantagem dessa separa\u00e7\u00e3o de fases \u00e9 que ela reduz a transpar\u00eancia do produto curado. Foi relatado que a adi\u00e7\u00e3o de acetato de polivinila, acetal de polivinila, poli\u00e9ster e outros pol\u00edmeros termopl\u00e1sticos ao sistema de polimeriza\u00e7\u00e3o de radical livre pode resultar em uma redu\u00e7\u00e3o significativa do encolhimento do volume.<\/p>\n<p>3. O uso do m\u00e9todo de cura cati\u00f4nica ou h\u00edbrida<\/p>\n<p>A cola UV cati\u00f4nica usa mon\u00f4meros de resina ep\u00f3xi e \u00e9ter vin\u00edlico, com sais de iodo como fotoiniciadores. A taxa de encolhimento da rea\u00e7\u00e3o de cura cati\u00f4nica da resina ep\u00f3xi \u00e9 muito menor do que a da rea\u00e7\u00e3o de radical livre, portanto, a taxa de encolhimento da cura pode ser reduzida com o uso da f\u00f3rmula cati\u00f4nica.<\/p>\n<p>A cola UV h\u00edbrida \u00e9 um sistema misto de radical livre e tipo cati\u00f4nico, geralmente na forma de compostos mistos de acrilato e ep\u00f3xi. Esse sistema h\u00edbrido de cura por UV pode melhorar a efici\u00eancia de inicia\u00e7\u00e3o quando fotoiniciado, aproveitar ao m\u00e1ximo as vantagens de ambos, reduzir o encolhimento do volume e ter bons efeitos sin\u00e9rgicos em outras propriedades.<\/p>\n<p>Al\u00e9m disso, de acordo com os requisitos do processo, os m\u00e9todos de cura por UV e outros m\u00e9todos de cura tamb\u00e9m podem ser usados para compor, como a cura por UV e calor ou o m\u00e9todo de composto de cura anaer\u00f3bica, o que tamb\u00e9m pode reduzir o encolhimento da cura.<\/p>\n<p>4. Adi\u00e7\u00e3o de mon\u00f4mero de inchamento<\/p>\n<p>A partir da rea\u00e7\u00e3o de polimeriza\u00e7\u00e3o cati\u00f4nica da resina ep\u00f3xi j\u00e1 conhecida, a rea\u00e7\u00e3o de polimeriza\u00e7\u00e3o de anel aberto \u00e9 menor do que a adi\u00e7\u00e3o da taxa de encolhimento do volume da rea\u00e7\u00e3o de polimeriza\u00e7\u00e3o. Para mon\u00f4meros monoc\u00edclicos, para cada dist\u00e2ncia de van der Waals convertida em uma dist\u00e2ncia de liga\u00e7\u00e3o covalente, h\u00e1 uma dist\u00e2ncia covalente convertida em uma dist\u00e2ncia de van der Waals. O encolhimento e o incha\u00e7o resultantes podem ser parcialmente compensados. Outros estudos revelaram que o tamanho da contra\u00e7\u00e3o de volume da rea\u00e7\u00e3o de polimeriza\u00e7\u00e3o de abertura de anel est\u00e1 relacionado ao tamanho do anel. \u00c0 medida que o anel aumenta de tamanho, a dist\u00e2ncia entre os \u00e1tomos de carbono e oxig\u00eanio que abrem liga\u00e7\u00f5es covalentes se aproxima da dist\u00e2ncia de van der Waals, e a contra\u00e7\u00e3o do volume diminui. Atualmente, o custo do mon\u00f4mero do tipo anel espiral \u00e9 muito alto, portanto, sua aplica\u00e7\u00e3o pr\u00e1tica ainda \u00e9 muito pequena, mas \u00e9 um m\u00e9todo promissor para eliminar o encolhimento da cola UV.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>How formulators usually evaluate this photoinitiator topic<\/h2>\n<p>When technical buyers or formulators screen photoinitiators, the most useful decision frame is usually cure quality plus application fit: which package cures reliably, keeps appearance acceptable, and still works under the lamp, film thickness, and substrate conditions of the actual process.<\/p>\n<ul>\n<li><strong>Match the package to the lamp first:<\/strong> mercury lamps, UV LEDs, and visible-light systems can rank the same photoinitiators very differently.<\/li>\n<li><strong>Check depth cure and surface cure separately:<\/strong> a film that feels dry on top can still be weak underneath.<\/li>\n<li><strong>Balance yellowing with reactivity:<\/strong> the strongest deep-cure route is not always the best commercial choice if color or migration risk becomes unacceptable.<\/li>\n<li><strong>Use the final formula as the benchmark:<\/strong> pigment load, monomer package, and film thickness can all change the apparent ranking of the same initiator.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">CHLUMINIT TPO-L<\/a>:<\/strong> A strong low-yellowing reference for LED-oriented UV systems.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">CHLUMINIT 819<\/a>:<\/strong> Useful when a formulation needs stronger absorption and deeper cure support.<\/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<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why are blended photoinitiator packages so common?<\/strong><br \/>Because one product may control yellowing or lamp fit well while another improves cure depth or line-speed performance, so the full package is often stronger than any single grade.<\/p>\n<p><strong>Should incomplete cure always be solved by adding more initiator?<\/strong><br \/>Not automatically. The real limitation may be the lamp, film thickness, pigment shading, or the rest of the reactive system rather than simple under-dosage.<\/p>\n<p><!-- lc-commercial-end --><\/p>\n<h2><strong><b>Entre em contato conosco agora!<\/b><\/strong><\/h2>\n<h4><strong><b>Se <\/b><\/strong><strong><b>Se precisar de pre\u00e7o ou COA, MSDS ou TDS, favor <\/b><\/strong><strong><b>Preencha o formul\u00e1rio abaixo e indique que , normalmente entraremos em contato dentro de 24 horas. Voc\u00ea tamb\u00e9m pode me enviar um e-mail <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"mailto:info@longchangchemical.com\">info@longchangchemical.com<\/a><\/span> durante o hor\u00e1rio comercial (das 8h30 \u00e0s 18h UTC+8 de segunda a s\u00e1bado) ou use o bate-papo ao vivo do site para obter uma resposta imediata.<\/b><\/strong><\/h4>","protected":false},"excerpt":{"rendered":"<p>In the curing process of UV adhesive there is a gelation process. Before gelation, the system is still fluid despite the shrinkage, while after gelation, the molecular movement is hindered<\/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-5342","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>How to reduce the shrinkage of UV glue? What are the methods? - Longchang chemical<\/title>\n<meta name=\"description\" content=\"In the curing process of UV adhesive there is a gelation process. 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