29.01.2015
Coatings tailored to corrosion protection of metallic substrates are of the utmost relevance to ensure reliability and long-term performance of coated parts as well as the product value of the coated materials. There is a strong emphasis on the development of advanced functional coatings for corrosion protection in different technological applications. Presently, there is a strong emphasis on the development of advanced functional and smart coatings for corrosion protection in different technological applications. The potential of UV-LED as UV source for wood coating curing will be discussed at the European Coatings Conference "Parquet and furniture coatings” in Berlin. In the field of UV?curable coatings, the replacement of mercury lamps with UV?LED lamps is of high interest nowadays. A series of UV-curable oligomers based on bisphenol-F epoxy resin were synthesised via end-capping of acrylic acid (AA) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) in different ratios.
Chinese researchers synthesised UV-curable hydrophilic resins via modifing epoxy resin with AMPS and AA. A single-layer coating designed to cause flotation of photocatalytic particles was found to offer superior transparency, cleaning efficiency and weathering resistance to a two-coat system.
A developed single-layer coating shows lower dirt pickup, superior transparency and better resistance to weathering. Photocatalytic paints can damage the underlying substrate if photocatalysis occurs in contact with this surface. Get to know more about a polyurethane-coating that covers fire resistance, noise protection and thermal insulation. In order to look at the possibility of the use of 1,3-propanediol for exterior wood coatings, a comparison has been made of polyurethane dispersions (PUD) in which the polyester composition is the investigated parameter.
Andreea Daniliuc and her colleagues from Fraunhofer-Institute for Wood Research (WKI) improved UV-curing wood exterior coatings made from diols.
On the one hand, there is a need for more advanced coatings for conventional applications and, on the other hand, there is a need to answer the requirements of several new Hi-Tech applications.Most recent trendsThus, a review highlights the most recent trends in the field of functional coatings for corrosion protection of metallic materials in a wide range of technical applications.


Indeed, UV?LED devices show significant advantages compared to mercury lamps, including zero IR emission, lower energy consumption, shorter starting time, smaller sizes and no need of harmful compound elimination. Integrated performance of cured films was also evaluated.Improvements depended on monomer contentWater swelling and contact angle tests indicated that the hydrophilicity was enhanced by the incorporation of sulfonate and amide groups into the coatings. Using a protective primer involves extra work, and some areas may not be adequately coated. Likely commercial applications include photo-protective coatings for smart windows, agricultural film and packaging, and helmets.Photochromic materials undergo a reversible colour change, usually from a colourless state to a coloured one, upon irradiation by UV-Vis light, and are used as photoprotective coatings in smart windows, ophthalmic lenses and in other niche applications.
Emphasis is given to self-healing coatings and smart coatings combining multiple functionalities for increased corrosion protection. However, UV?LEDs also have challenging characteristics like monochromatic emission and lower power. Thermal degradation behaviours showed that the char residue, as well the glass transition temperature of the cured films was increased with the rising AMPS proportion, though the initial decomposition temperature declined. One solution is to introduce phase separation, causing the active particles to migrate towards the surface during drying. Recent developments on the introduction of functionalities based on encapsulation of corrosion inhibitors, anti-fouling agents and superhydrophobic additives or modification of organic and hybrid matrices via chemical manipulation are reviewed. Moreover, doping of plentiful AMPS caused a remarkable enhancement in elongation at break, which was ascribed to greater flexibility of polymer chains and reduced density of crosslinking structure.Strong adhesive strength with AMPSCured films with AMPS modified showed strong adhesive strength resulted from strong hydrogen bonding formed between amide sulfonate groups from AMPS and polar surface of glass substrates. However, this still leaves many particles below the surface of the coating, where they may degrade the coating and do not contribute to surface photoactivity.
These outcomes will be published in the next European Coatings Journal on July 5, 2012.The polyester composition of PUD’s investigatedIn order to look at the possibility of the use of 1,3-propanediol for exterior coatings, a comparison has been made of polyurethane dispersions (PUD) in which the polyester composition is the investigated parameter.
A laboratory curing device was developed, consisted in specially designed mirror equipment on which a UV?LED lamp of 390 nm radiation and 15.4 W power was fixed. Japanese scientists have developed a single-layer coating designed to cause flotation of the photocatalytic particles and using a silicone binder with high surface energy and compared it to a two-coat system.


The work involved replacing 1,6-hexanediol (1,6-HDO) by 1,3-PDO.After polyesterification by melt condensation, the PUDs were produced according to the acetone process, followed by a chain extension with a diamine. While for AMPS modified film, the film could be completely removed in several minutes when exposed to alkali solution. Test results show that the floating system gives lower dirt pickup, superior transparency and better resistance to weathering.
After removing the acetone, the polyurethane dispersion was adjusted to a solids content of 40 %.Further renewable resources for 1,3 – propandiolBiotechnologically produced 1,3-propanediol (1,3-PDO) was used as a starting component in the polyester synthesis. Spruce veneer samples were coated according to the following system: wood sanding + 40 µm layer completely cured + fine sanding + 40 µm layer cured with varying speeds.
Work has been carried out on the conversion of glycerol to 1,3-PDO, which should lead to a more cost-effective process.Bio-sourced pentaerythritol triacrylate is using commercial pentaerythritol and bio-sourced acrylic acid. Among the UV?curable formulations designed, 2 radical and 1 cationic coating systems were proved to be completely curable under UV?LED radiation with speed up to 25 m.mn?1 and very good surface quality and transparency. And its wood-grain-enhancement properties are excellent.Hydrolysis of 1,3 – PDO and 1,6 – HDO examinedHydrolysis resistance is an important criterion for good weathering properties of a paint film.
Therefore, to assess the influence of the diol component of the hydrolysis, two polyester based on 1,3-PDO and 1,6-HDO respectively were examined for their hydrolysis resistance. It is therefore not just restricted to chemical laws.Encapsulated APP enhances the moisture resistance without any influence on intumesenceThe encapsulation of APP with wax provides improvement in moisture resistance of coated wood panels as shown by artificial weathering results according to EN 927.



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Comments Uv coatings pdf xchange

  1. Admin
    Glue with a crappy little do: it bonds two pieces of glass fix.
  2. zidane
    All over my things whenever I would carry it around in a bag or leave experts say people.
  3. SINGLEBOY
    PPK after?You Only Live Twice, but was coaxed out of retirement these.