2025 Prinzip der UV-Härtung

Hallo zusammen! Ich bin ein Star-Mitarbeiter bei CHROMÉCLAIR, eine Marke von hemafreie Gelpoliermittelmarken.Today, I’ll organize some information about UV curing. I hope this helps you. UV adhesive curing occurs when photoinitiators (or photosensitizers) within UV-curable materials absorb ultraviolet light, generating active free radicals or cations. These trigger chemical reactions such as polymerization, cross-linking, and grafting of monomers or oligomers, transforming the liquid into a solid within seconds. Jede Art von UV-Licht hat einen bestimmten Wellenlängenbereich, der seine Eindringtiefe in das Substrat bestimmt. Das geeignete UV-Licht kann je nach dem verwendeten Substratmaterial und dem gewünschten Aushärtungseffekt ausgewählt werden:

• UVC ist ein kurzwelliges ultraviolettes Licht (200nm-280nm), das eine starke Leistung im Bereich von 250-260nm liefert, sich aber schlecht in der Luft ausbreitet. Da Sauerstoff UVC blockieren kann, werden viele Anwendungen in stickstoffgespülten Umgebungen durchgeführt. Es wird in erster Linie für die Aushärtung von Oberflächen verwendet und erzeugt Oberflächenhärte und Abriebfestigkeit (UVC verleiht Beschichtungen eine Kratzfestigkeit). Gängige Anwendungen sind: transparente Beschichtungen auf Papier- und Kunststoffoberflächen; harte Beschichtungen für optische und Kfz-Linsen; Desinfektions- und Sterilisationsanwendungen; DNA-Vernetzung; Oberflächenmodifizierung.
• UVB ist ein mittelwelliges Ultraviolett (280nm-320nm), das in der Lage ist, tief einzudringen und Beschichtungen und Klebstoffe zu härten. Gängige Anwendungen sind: Aushärtung von Farben, Klebstoffen und Druckfarben; Sterilisation und Desinfektion.
• UVA ist ein langwelliges Ultraviolett (320nm-395nm), das zur Aushärtung der tiefsten Schichten und zur Gewährleistung der Adhäsion verwendet wird. Gängige Anwendungen sind: Aushärtung von Druckfarben, Beschichtungen und Klebstoffen; UV-Inspektion; UV-Fluoreszenz.
• UVV ist UV-Licht im sichtbaren Bereich (395nm-455nm), das für die Aushärtung der tiefsten Bereiche verwendet wird und für die Hafteigenschaften dieser Formulierungen verantwortlich ist. UVV funktioniert gut mit weißen und silbernen leitfähigen Pigmenten. Zu den üblichen Anwendungen gehören: leitfähige Silberdruckfarben, Beschichtungen mit Titandioxidpigmenten, Klebstoffe und tief eindringende Vergussmassen.

UV-Härtung vs. thermische Trocknung

In industrial processes, two popular drying/curing methods are thermal drying and UV curing. Both methods transform liquid or semi-liquid materials into solid form through heating or ultraviolet radiation. While both aim to cure substances, significant differences exist between them. Thermal drying is a process that applies heat to ink or coatings on a substrate to accelerate their curing time. It is commonly used for substances like epoxy resins, powder coatings, and certain types of adhesives. It can also be applied to various coatings such as epoxy, polyester, acrylic, and polyurethane, which can be applied to substrates including metals, plastics, and composites. Heat is typically supplied via large gas-fired ovens, forced-air dryers, or infrared lamps. The curing temperature and duration depend on the specific material being cured. Drying lines can be extensive, tailored to the target production speed and drying time requirements of the ink or coating. Additionally, certain coatings may require special formulations to ensure proper drying during thermal curing. For instance, some coatings might need the addition of drying agents or accelerators to enhance drying efficiency or reduce drying time. In terms of energy consumption and production efficiency, UV curing technology consumes significantly less energy than thermal drying technology. The energy consumption of UV curing is only 10%-20% of that required by thermal curing processes. This substantial energy gap primarily stems from UV curing’s high energy conversion efficiency: UV light sources convert most input energy into usable ultraviolet light, whereas thermal drying inevitably loses substantial thermal energy during heat transfer. UV curing technology also excels in production efficiency. Its curing speed is exceptionally fast, typically completing the process in just 0.1 to 10 seconds. In contrast, thermal drying technology often requires several minutes or longer to achieve the same curing effect. This substantial time difference directly impacts production efficiency, making UV curing technology particularly suitable for high-speed production lines and batch manufacturing. UV-cured coatings typically exhibit higher crosslinking density, directly leading to superior mechanical properties and chemical resistance. For instance, UV-cured coatings often demonstrate greater hardness, enhanced impact resistance, and outstanding chemical resistance. These characteristics make UV curing particularly suitable for applications requiring long-term outdoor exposure, such as architectural exterior coatings or protective automotive component coatings. However, UV curing technology may have limitations in certain specific applications. For instance, when handling thicker coatings, UV curing may encounter uneven curing issues due to the limited penetration capability of UV light. In such cases, thermal drying technology may be more suitable as it better accommodates thicker coatings. Simultaneously, thermal drying technology is expanding into emerging fields. For example, in new energy material manufacturing, thermal drying can be employed for drying battery electrode materials, ensuring material uniformity and conductivity. Insgesamt hängt die Entscheidung zwischen thermischer Trocknung und UV-Härtung letztlich von der jeweiligen Anwendung ab, wobei Faktoren wie Geschwindigkeit, Haltbarkeit und Umweltauswirkungen berücksichtigt werden sollten.

UV-LED und traditionelle Quecksilberlampenhärtung

Sowohl die UV-LED-Härtung als auch die traditionelle Quecksilberlampenhärtung beruhen auf der Bestrahlung mit Licht, um Photoinitiatoren anzuregen und so die Polymerisationsreaktion der in der Flüssigkeit enthaltenen Monomere und Präpolymere zu fördern. Dieser Prozess führt zur Bildung einer gehärteten Filmschicht. Compared to UV curing, UV-LED technology consumes only one-quarter of the electrical energy, significantly reducing energy consumption and CO2 emissions. Traditional mercury lamps easily exceed radiation levels of 10W/cm², causing excessive heat during surface curing. In contrast, UV-LED radiation energy is controllable and generates minimal heat. This results in reduced thermal impact on heat-sensitive substrates like plastic films, requiring only minor adjustments to printing precision. UV-LED light source components have a lifespan approximately 12 times longer than traditional UV components, substantially reducing replacement frequency and associated material costs. UV-LEDs enable instant on/off operation, eliminating the preheating and cooling times required for UV curing, thereby enhancing operational efficiency. UV-LED systems produce no ozone, improving the working environment for employees and eliminating the need for capture and incineration equipment to mitigate ozone hazards. UV-LED light sources and their associated equipment are highly compact, simplifying setup and saving space. As evident from these advantages, UV-LED curing systems not only significantly reduce costs but also minimize environmental pollution and energy consumption. However, unlike traditional UV curing that utilizes the entire 200–450 nm ultraviolet spectrum, UV-LED lamps focus on a narrow range within this spectrum, typically 395–405 nm. While some current UV-LED curing systems operate at 365 nm, most still center around 395 nm, which remains the standard wavelength for UV-LED curing. We hope this article helps you understand UV curing more easily! CHROMÉCLAIR offers Base coats, Top coats, solid color Gel-Politur ohne HEMAund hemafreier Gel-Lack für Katzenaugen. Auf ihrer Website finden Sie auch Anleitungen für die Nagelkunst, wie zum Beispiel:

Nail Art Tipps: DIY Barockes Edelsteindesign

Wie macht man die Polka Dot Bow Nailart zu Hause?

   

Related product references: For formulation review or sourcing comparison, see CHLUMINIT TMO und CHLUMINIT 819.