{"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\/de\/how-to-reduce-the-shrinkage-of-uv-glue\/","title":{"rendered":"Wie kann man die Schrumpfung von UV-Kleber reduzieren? Welche Methoden gibt es?"},"content":{"rendered":"<h1><strong>Wie kann man die Schrumpfung von UV-Kleber reduzieren? Welche Methoden gibt es?<\/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>Bei der Aush\u00e4rtung von UV-Klebstoffen findet ein Gelierungsprozess statt. Vor der Gelierung ist das System trotz der Schrumpfung noch fl\u00fcssig, w\u00e4hrend nach der Gelierung die Molekularbewegung behindert wird und weitere Aush\u00e4rtungsreaktionen die Hauptursache f\u00fcr die Schrumpfungsspannung sind. Der Schrumpfungsstress ist daher nicht proportional zur Volumenschrumpfung des gesamten Aush\u00e4rtungsprozesses. Vielmehr h\u00e4ngt sie von der Volumenschrumpfung nach der Gelierung ab. Je h\u00f6her die Funktionalit\u00e4ten der Reaktanten sind, desto geringer ist der Grad der Reaktion der funktionellen Gruppen bei der Gelierung. Daher f\u00fchrt ein Reaktionssystem mit hoher Funktionalit\u00e4t zu einer h\u00f6heren Schrumpfungsspannung nach der Aush\u00e4rtung.<\/p>\n<p>M\u00f6glichkeiten zur Verringerung der Schrumpfung von UV-Klebstoffen<\/p>\n<p>1. UV-Klebstoffformulierung unter Verwendung von schrumpfungsarmen Monomeren und Oligomeren<\/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\/de\/product\/iboa-monomer-cas-5888-33-5\/\">IBOA Monomer<\/a> for lower stress with <a href=\"https:\/\/longchangchemical.com\/de\/product\/tmpta-cas-15625-89-5\/\">TMPTA-Monomer<\/a> for higher reactivity and crosslink density.<\/p>\n<p>2. UV-Kleber mit Polymer oder anorganischem F\u00fcllstoff<\/p>\n<p>Bei der Methode der Zugabe von Polymeren kann das neu entstandene System und die vorher zugegebenen Polymere zwischen der Phasentrennung, die manchmal w\u00e4hrend des Aush\u00e4rtungsprozesses auftritt, auch einen Teil der Volumenschrumpfung ausgleichen. Der Nachteil dieser Phasentrennung ist jedoch, dass sie die Transparenz des ausgeh\u00e4rteten Produkts verringert. Es wurde berichtet, dass die Zugabe von Polyvinylacetat, Polyvinylacetal, Polyester und anderen thermoplastischen Polymeren zu dem radikalischen Polymerisationssystem zu einer erheblichen Verringerung der Volumenschrumpfung f\u00fchren kann.<\/p>\n<p>3. Die Verwendung einer kationischen oder hybriden H\u00e4rtungsmethode<\/p>\n<p>Der kationische UV-Kleber verwendet Monomere aus Epoxidharz und Vinylether mit Ium-Salzen als Photoinitiatoren. Die Schrumpfungsrate der kationischen Aush\u00e4rtungsreaktion von Epoxidharz ist viel niedriger als die der freien Radikalreaktion, so dass die Aush\u00e4rtungsschrumpfungsrate durch die Verwendung einer kationischen Formel reduziert werden kann.<\/p>\n<p>Hybrid-UV-Kleber ist ein gemischtes System aus freien Radikalen und kationischen Verbindungen, normalerweise in Form von gemischten Acrylat- und Epoxidverbindungen. Dieses hybride UV-H\u00e4rtungssystem kann die Initiierungseffizienz bei der Fotoinitiierung verbessern, die Vorteile beider Systeme voll ausspielen, die Volumenschrumpfung reduzieren und gute Synergieeffekte bei anderen Eigenschaften haben.<\/p>\n<p>Dar\u00fcber hinaus k\u00f6nnen je nach Prozessanforderungen auch UV- und andere Aush\u00e4rtungsmethoden verwendet werden, wie z. B. UV- und W\u00e4rmeh\u00e4rtung oder anaerobe Aush\u00e4rtungsmethoden, die auch die Aush\u00e4rtungsschrumpfung reduzieren k\u00f6nnen.<\/p>\n<p>4. Zugabe von quellendem Monomer<\/p>\n<p>Aus der kationischen Polymerisationsreaktion des Epoxidharzes ist bereits bekannt, dass die Polymerisationsreaktion mit offenem Ring kleiner ist als die Schrumpfungsrate des Polymerisationsvolumens. Bei monocyclischen Monomeren gibt es f\u00fcr jeden in einen kovalenten Bindungsabstand umgewandelten van der Waals-Abstand einen in einen van der Waals-Abstand umgewandelten kovalenten Abstand. Die daraus resultierende Schrumpfung und Quellung kann teilweise ausgeglichen werden. Weitere Untersuchungen ergaben, dass das Ausma\u00df der Volumenkontraktion bei der ring\u00f6ffnenden Polymerisationsreaktion mit der Gr\u00f6\u00dfe des Rings zusammenh\u00e4ngt. Mit zunehmender Gr\u00f6\u00dfe des Rings n\u00e4hert sich der Abstand zwischen den Kohlenstoff- und Sauerstoffatomen, die kovalente Bindungen \u00f6ffnen, dem van-der-Waals-Abstand an, so dass die Volumenkontraktion abnimmt. Derzeit sind die Kosten f\u00fcr Monomere des Spiro-Ring-Typs sehr hoch, so dass ihre praktische Anwendung noch sehr gering ist, aber es ist eine vielversprechende Methode zur Beseitigung der Schrumpfung von UV-Klebern.<\/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\/de\/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\/de\/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\/de\/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\/de\/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>Kontaktieren Sie uns jetzt!<\/b><\/strong><\/h2>\n<h4><strong><b>Wenn <\/b><\/strong><strong><b>Sie ben\u00f6tigen Preis oder COA, MSDS oder TDS, bitte <\/b><\/strong><strong><b>F\u00fcllen Sie das untenstehende Formular aus und geben Sie an, dass wir Sie in der Regel innerhalb von 24 Stunden kontaktieren werden. Sie k\u00f6nnen mir auch eine E-Mail schicken <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"mailto:info@longchangchemical.com\">info@longchangchemical.com<\/a><\/span> w\u00e4hrend der Gesch\u00e4ftszeiten ( 8:30 bis 18:00 Uhr UTC+8 Mo.~Sa. ) oder nutzen Sie den Live-Chat auf der Website, um eine schnelle Antwort zu erhalten.<\/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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