{"id":5021,"date":"2022-01-26T14:39:05","date_gmt":"2022-01-26T14:39:05","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5021"},"modified":"2026-04-28T10:41:55","modified_gmt":"2026-04-28T10:41:55","slug":"process-and-advantages-of-uv-curing-powders","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/de\/process-and-advantages-of-uv-curing-powders\/","title":{"rendered":"Verfahren und Vorteile von UV-h\u00e4rtenden Pulvern"},"content":{"rendered":"<h1><strong>Verfahren und Vorteile von UV-h\u00e4rtenden Pulvern<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> Photoinitiator choice is usually driven by lamp match, cure depth, yellowing, and whether the final film still performs on the real substrate. The best package is rarely the cheapest single grade.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>MDF l\u00e4sst sich leicht verarbeiten und hat eine homogene und gleichm\u00e4\u00dfige Oberfl\u00e4che. Naturholz kann auch pulverbeschichtet werden, aber die Oberfl\u00e4che kann ungleichm\u00e4\u00dfig sein. Probleme mit Ausgasungen und Nadell\u00f6chern k\u00f6nnen aufgrund von Ver\u00e4nderungen des Harz- und Feuchtigkeitsgehalts von Naturholz auftreten<\/p>\n<p>Dichte, Faser-, Harz- und Feuchtigkeitsgehalt von nat\u00fcrlichem Holz variieren je nach Holzart und h\u00e4ngen auch davon ab, wo es gewachsen ist, und selbst wenn die Baumart dieselbe ist, ist jeder Baum anders.<\/p>\n<p>Da bei der Pulverbeschichtung W\u00e4rme zum Schmelzen des Pulvers eingesetzt wird, kann es selbst bei niedrigeren Temperaturen und kurzen Einwirkzeiten zu unkontrollierbaren Reaktionen im Naturholz kommen. Dies macht das Erreichen einer gleichm\u00e4\u00dfigen Oberfl\u00e4che besonders problematisch, wenn Pulverbeschichtungen auf Naturholz aufgetragen werden. Die UV-geh\u00e4rtete Pulverbeschichtung von MDF ergibt eine gleichm\u00e4\u00dfigere, optisch ansprechende Oberfl\u00e4che.<\/p>\n<p>UV-curable powder coatings are produced by combining resins, pigments, high performance additives and photoinitiators. Photoinitiators such as <a href=\"https:\/\/longchangchemical.com\/de\/product\/cas-270586-78-2\/\">Fotoinitiator TMO<\/a> und <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">Photoinitiator TPO-L<\/a> are key components because they absorb high-intensity UV light and generate and activate free radicals to crosslink the coating. Curing is the cross-linking of the entire coating at the molecular level and is an instantaneous curing stage. &#8220;As soon as the photoinitiator is exposed to UV light, crosslinking occurs and the coating cures immediately,&#8221; said Lonchak.<\/p>\n<p>Additive verbessern die Beschichtungsoberfl\u00e4che, indem sie bestimmte Eigenschaften wie Kratz- und Abriebfestigkeit, Glanz und Textur verbessern oder anpassen. Pigmente sorgen f\u00fcr Farbe und Deckkraft.<\/p>\n<p>UV-geh\u00e4rtete Pulverlacke werden auf die gleiche Art und Weise wie duroplastische Pulverlacke hergestellt, wobei die gleichen Anlagen verwendet werden: Mischen, Extrudieren, K\u00fchlen, Schneiden, Mahlen, Sortieren, Sieben und Verpacken.<\/p>\n<p>Um einen guten Aush\u00e4rtungseffekt zu erzielen, m\u00fcssen Art und Menge des Fotoinitiators auf die UV-Lichtquelle abgestimmt werden, einschlie\u00dflich der geeigneten Kombination aus UV-Energiedosis, Intensit\u00e4t und Wellenl\u00e4nge.<\/p>\n<p>F\u00fcr die UV-H\u00e4rtung von Pulverbeschichtungen gibt es verschiedene Arten von Quecksilberdampf-Mitteldruck-UV-Lampen. Quecksilberdampflampen (\"H\"-Lampen) liefern kurzwellige UV-Energie (220-320 nm) und sind f\u00fcr Lack- und Klarlackanwendungen geeignet. Eisen-dotierte Quecksilberlampen (\"D\"-Lampen) liefern Energie bei einigen l\u00e4ngeren Wellenl\u00e4ngen (320-400 nm), um die Aush\u00e4rtung von Systemen mit geringem Pigmentgehalt zu unterst\u00fctzen. Gallium-dotierte Quecksilberlampen (\"V\"-Lampen) haben eine starke Energieabgabe bei langen Wellenl\u00e4ngen (405-440 nm) und sind die Arbeitspferde f\u00fcr die Aush\u00e4rtung von hochpigmentierten Systemen. Die langwellige Energie durchdringt auch dickere Beschichtungen und UV-geh\u00e4rtete Pulverlacke von pigmentierten Systemen.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-5022\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-650x433.jpg\" alt=\"\" width=\"650\" height=\"433\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-650x433.jpg 650w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-325x217.jpg 325w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-300x200.jpg 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-500x333.jpg 500w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-750x500.jpg 750w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-1000x667.jpg 1000w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2022\/01\/1-1-1500x1000.jpg 1500w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><\/p>\n<p>MDF-Ausgangswerkst\u00fccke werden bei der Pulverbeschichtung UV-geh\u00e4rtet<\/p>\n<p>Der Prozessablauf f\u00fcr UV-h\u00e4rtende Pulverbeschichtungen ist schnell. \"Es ist ein 20-min\u00fctiger, einstufiger Prozess, der ein MDF-Rohteil in ein fertiges Teil verwandelt, das dann verpackt und versandt werden kann\", erkl\u00e4rt Loncic.<\/p>\n<p>Zun\u00e4chst wird das Werkst\u00fcck in die Fertigungsstra\u00dfe geh\u00e4ngt, und die beim Prozess verbleibenden Staubpartikel werden durch Einblasen von Druckluft entfernt. Ein Schleifen der Oberfl\u00e4che ist vor der Pulverbeschichtung in der Regel nicht mehr erforderlich. Anschlie\u00dfend kommt das MDF-Werkst\u00fcck f\u00fcr eine Minute in einen auf niedrige Temperaturen vorgeheizten Ofen. \"Dadurch wird die Platte vor dem Lackieren entl\u00fcftet und die Feuchtigkeit aus der MDF an die Oberfl\u00e4che gebracht, wodurch die Platte leitf\u00e4hig wird und die Pulverbeschichtung h\u00e4lt\", f\u00fcgt Loncic hinzu.<\/p>\n<p>Dann wird der UV-h\u00e4rtbare Pulverlack elektrostatisch mit einem automatischen Spr\u00fchpistolensystem aufgetragen. Anschlie\u00dfend wird das Pulver in einem Niedrigtemperaturofen f\u00fcr eine Minute l\u00e4nger geschmolzen oder geliert. Nach dem Schmelzen erstarrt das Werkst\u00fcck sofort unter UV-Licht. In weniger als 20 Minuten ist das Werkst\u00fcck fertig bearbeitet und bereit, verpackt und an den Kunden versandt zu werden.<\/p>\n<p>UV-h\u00e4rtende Pulverlacke wurden vor mehr als 20 Jahren als Alternative zu w\u00e4rmegeh\u00e4rteten Pulverlacken entwickelt. Die thermische Aush\u00e4rtung erfordert hohe Temperaturen (etwa 400\u00b0F\/204\u00b0C) und dauert 10-30 Minuten oder l\u00e4nger. Die Verarbeitungszeit ist l\u00e4nger, und vor der Verarbeitung im n\u00e4chsten Schritt ist eine zus\u00e4tzliche Abk\u00fchlungszeit erforderlich.<\/p>\n<p>Wie Lonchak betont, liegen die Hauptvorteile der UV-H\u00e4rtung gegen\u00fcber der thermischen H\u00e4rtung in den Bereichen Zeit und Temperatur. Der elektrostatische Pulverbeschichtungsprozess f\u00fcr UV-h\u00e4rtende Pulverlacke und thermisch geh\u00e4rtete Pulverlacke ist genau derselbe, jedoch sind die Schmelz-\/Flie\u00df- und Aush\u00e4rtungsprozesse wichtige unterschiedliche Merkmale, die beide funktionell voneinander unterscheiden.<\/p>\n<p>Der UV-H\u00e4rtungsprozess erfolgt sofort. Es ist nur eine kurze Aufw\u00e4rmphase von einer Minute bei 220-240\u00b0F (104-116\u00b0C) erforderlich, um den Pulverlack vor der UV-H\u00e4rtung zu schmelzen\/zu ebnen. Dies hat den Vorteil, dass die Prozesszeit erheblich verk\u00fcrzt und die Gesamttemperatur gesenkt wird, was den UV-h\u00e4rtbaren Pulverbeschichtungsprozess f\u00fcr die MDF-Herstellung sehr wichtig macht. \"Zu gro\u00dfe Hitze und zu lange Einwirkzeiten k\u00f6nnen zu Rissen und anderen Defekten in der Platte f\u00fchren\", so Lonczak.<\/p>\n<p>Pulverbeschichtungen stellen einige Herausforderungen dar, aber DVUV hat die Ma\u00dfnahmen und Mittel, um sie zu bew\u00e4ltigen, beherrscht. Schwankungen in der Luftfeuchtigkeit und der Temperatur k\u00f6nnen den Erfolg eines Prozesses beeintr\u00e4chtigen, was jedoch durch die Prozesssteuerung in einer temperaturgeregelten Fabrik leicht zu bew\u00e4ltigen ist. Ein Befeuchter sorgt daf\u00fcr, dass die MDF-Platte vor der Pulverbeschichtung den richtigen Feuchtigkeitsgehalt aufweist.<\/p>\n<p>Die DVUV-Parametereinstellung und -Pr\u00fcfung beim ersten Durchlauf gew\u00e4hrleistet au\u00dferdem die Herstellung stabiler und konsistenter Produkte. Die Arbeitsweise von DVUV wird f\u00fcr jede Verbindung entsprechend den Anforderungen des Kunden an die Parameter des Werkst\u00fccks angepasst. \"Liniengeschwindigkeit, Pistolenabstand und Prozesstemperatur sind bei jedem Projekt, das wir durchf\u00fchren, anders und werden korrigiert\", fasst Loncic zusammen.<\/p>\n<p>Neben der Qualit\u00e4tskontrolle w\u00e4hrend des Produktionslaufs f\u00fchrt das Produktionsteam gleichzeitig auch die Inbetriebnahme durch. Qualit\u00e4tskontrolle der fertigen Werkst\u00fccke, einschlie\u00dflich einer Reihe von zerst\u00f6renden und zerst\u00f6rungsfreien Pr\u00fcfungen:<\/p>\n<p>Visuelle Pr\u00fcfung von Werkst\u00fcckoberfl\u00e4chen im Vergleich zu Normteilen<\/p>\n<p>Pr\u00fcfung mit dem Drehmoment-Dickenmesser (Messung der Beschichtungsdicke)<\/p>\n<p>Glosse lesen<\/p>\n<p>MEK-L\u00f6sungsmittelbest\u00e4ndigkeitstest<\/p>\n<p>\"Unsere Produktionsteams verf\u00fcgen auch \u00fcber vorbeugende Wartung, R\u00fcckverfolgbarkeitsanalysen und Pl\u00e4ne f\u00fcr Korrekturma\u00dfnahmen, wenn Qualit\u00e4ts- oder Verarbeitungsprobleme auftreten.<\/p>\n<p>Die Zukunft f\u00fcr die pulverbeschichteten MDF von DVUV ist rosig. Regierungen und Aufsichtsbeh\u00f6rden schr\u00e4nken die Verwendung von Fl\u00fcssiglacken auf L\u00f6sungsmittelbasis ein oder verbieten sie.<\/p>\n<p>Fl\u00fcssiglacke auf Wasserbasis lassen sich nur schwer auf MDF anwenden, weshalb UV-h\u00e4rtbare Pulverlacke eine ideale Verarbeitungsl\u00f6sung f\u00fcr MDF darstellen.<\/p>\n<p>UV-h\u00e4rtende Pulverlacke sind l\u00f6sungsmittelfrei, ungiftig und enthalten keine fl\u00fcchtigen organischen Verbindungen (VOC) oder sch\u00e4dliche Luftschadstoffe. F\u00fcr die Produktion ist keine Sondergenehmigung erforderlich.<\/p>\n<p>&nbsp;<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical selection route for photoinitiator-related projects<\/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\/photoinitiator-184-cas-947-19-3\/\">CHLUMINIT 184<\/a>:<\/strong> A classic free-radical benchmark for fast surface cure in many UV systems.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/de\/product\/cas-270586-78-2\/\">CHLUMINIT TMO<\/a>:<\/strong> A valuable comparison point when lower yellowing or TPO-replacement discussions matter.<\/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>","protected":false},"excerpt":{"rendered":"<p>MDF is easy to process and has a homogeneous and homogeneous surface. Natural wood can also be powder coated, but the finish may be uneven. 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