Download UV Coatings: Basics, Recent Developments and New by Reinhold Schwalm PDF
By Reinhold Schwalm
For the reason that UV curing (light prompted polymerisation of multifunctional oligomers) is a really ecoefficient and effort saving curing technique, the expansion charges of UV curable coatings are within the diversity of 10% consistent with yr. the common UV coatings are solvent unfastened (100% solids), hence aiding the and the surroundings to lessen considerably VOC (volatile natural compounds). lately, the car has stumbled on that UV cured coatings are very scratch resistant, which motivated very huge paintings into the advance of UV coatings for automobile purposes. on account that UV curing is particularly common, additionally different structures in addition to the a hundred% stable (typical) UV coatings are built, like waterbased UV- , UV powder and twin medication (UV and thermal) systems.UV Coatings comprises an outline of the know-how, the curing technique together with the apparatus priceless, the uncooked fabrics (resins, diluents, photoinitiators) used, the benefits and downsides of this quickly rising know-how, in addition to proposed technical strategies to take on the dangers. Structure-property relationships might be given, in particular concerning the mechanical houses of coatings in addition to scratch resistance, normally facing car functionality criteria.The major a part of the ebook will take care of new advancements, like water-based UV coatings, UV powder coatings and twin treatment platforms, cured by way of UV and thermal strength, which were constructed to treatment the coating on 3 dimensional substrates in shadow components. the most purposes of UV Coatings may be defined, beginning with the classical ones on temperature delicate substrates, like wooden, paper and plastics, the place the UV curable coatings arealready good established.* taking a look at UV curing as a key to scratch resistant automobile transparent coats* Ecoefficiency of UV Coatings* entire evaluation of the expertise, fabrics and markets
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Extra info for UV Coatings: Basics, Recent Developments and New Applications
Sample text
All these components are available individually or as complete systems. The major companies involved in the supply of such equipment are listed at the end of the chapter. 48 Thus, important factors to be known about the UV lamp are the irradiance, the profile of radiant power (W/cm2 ) and the wavelength range, as well as the spectral distribution, which is the radiant power as a function of wavelength. The second factor, which determines the energy density (the time integral of irradiance), is the curing time.
Pdf). Excimer lamps emit at a single wavelength: 172 nm, used for UV matting; 222 nm, used for UV curing for printing applications; 308 nm, used for UV curing for printing applications. Their major benefits are described as not warming up the substrate, thus being used beneficially in printing applications, resulting in reduced smell from the print and no warping of the printed medium, and since they are operated under inert conditions, not producing ozone as a side product. Excimer lamps are typically monochromatic, which also may have some disadvantages in some curing applications, for example if the absorption of UV absorbers or pigments is very high at these wavelength, or the photoinitiators do not absorb significantly at the specific excimer wavelength output.
However, the measurement of the total energy in this range may not be sufficient, since the distribution of the different wavelengths within the spectrum may be considerably different with two lamps. 21), the radiant power applied below 300 nm is much different with the standard mercury compared to the gallium added bulb. Thus, even if the total energy in the UV-C is the same the curing result will not be the same; for example, in the case of the standard bulb, 1000 mJ/cm2 is applied within 4 s (at 250 mW/cm2 radiant power) and with the gallium bulb 1000 mJ/cm2 is applied within 20 s (at 50 mW/cm2 ).