PLEXIGLAS® Molding Compounds news
CoverForm®: Resistance to scratching and chemicals in just one step
Market launch: new, economical process to equip plastics surfaces with a functional coating
System solution jointly developed by Evonik and KraussMaffei
PMMA has the hardest surface and therefore the best scratch resistance of all thermoplastics. To meet particularly stringent requirements for surface hardness in extremely demanding applications, PMMA components are equipped with an additional scratch-resistant layer that simultaneously ensures high chemical resistance.
For this purpose, the methacrylates specialists at Evonik have developed a one-step process together with machine manufacturer KraussMaffei for the scratch-resistant coating of PMMA moldings. At the same time, this novel layer shows high chemical resistance. In the CoverForm® process, coating is performed directly in the injection mold. That saves time and costs, since this surface protection could previously only be applied after injection molding. CoverForm® now dispenses with this time-consuming process. The new method is a system solution consisting of PLEXIGLAS® cf molding compounds, a specially developed, solvent-free multicomponent reactive system on an acrylate base that is characterized by its excellent adhesion, and the corresponding machine technology. Fields of application include cell phone screens, tachometer covers, automotive panels and nameplates for household appliances. There will also be a presentation on this technology at the FAKUMA Forum.
In just one step….
A small3quantity metering unit specially developed by KraussMaffei injects the liquid multi3component reactive system into the cavity of a CX injection molding machine. During the subsequent compression step, the coating is evenly distributed on the surface of the molding, providing cover layers less than 50 µm thick.
The machines of the CX series are suitable for clean rooms, and appropriate clean3room equipment makes sure that the production room remains dust3free, excluding any risk of contamination for the components. Since the coating partially cures in the mold, the component can be easily demolded. After the part is removed, the scratch3resistant coating is completely cured by means of UV radiation.
…to great advances in the future
Processors the world over rely on PLEXIGLAS® molding compounds, in the automotive and lighting industry, optics and communications or display applications, wherever high brilliance and transparency combined with outstanding surface properties are required.
In particular, the material's very high transmission of more than 92 percent, the low birefringence (≤ 20 nanometers) and the absolute colorlessness are convincing features in transparent applications.
The new CoverForm® system solution substantially cuts fabrication costs for scratch-resistant coated and chemical-resistant plastics parts since they require no subsequent coating.
CoverForm® is a future-ready technology in terms of economy and performance.
The Performance Polymers Business Unit of Evonik Industries is a worldwide manufacturer of PMMA products sold under the PLEXIGLAS® trademark on the European, Asian, African and Australian continents and under the trademark ACRYLITE® in the Americas.
Evonik Industries is the creative industrial group from Germany which operates in three business areas: Chemicals, Energy and Real Estate. Evonik is a global leader in specialty chemicals, an expert in power generation from hard coal and renewable energies, and one of the largest private residential real estate companies in Germany. Our strengths are creativity, specialization, continuous self-renewal, and reliability. Evonik is active in over 100 countries around the world. In its fiscal year 2008 about 41,000 employees generated sales of about €15.9 billion and an operating profit (EBITDA) of about €2.2 billion.
In so far as forecasts or expectations are expressed in this press release or where our statements concern the future, these forecasts, expectations or statements may involve known or unknown risks and uncertainties. Actual results or developments may vary, depending on changes in the operating environment. Neither Evonik Industries AG nor its group companies assume an obligation to update the forecasts, expectations or statements contained in this release.