智数汽车大数据麦克恒通汽车轻量化在线
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[塑料] 车窗玻璃用PC+IR吸收剂制造,降低车内温度

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发表于 2013-10-18 11:27:07 | 显示全部楼层 |阅读模式
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本帖最后由 846082533 于 2015-12-31 15:00 编辑 <br /><br />[table=98%]
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LEVERKUSEN -- The new Bugatti Veyron 16.4 Grand Sport combines the looks of an open-top roadster with the dynamics and safety of a closed vehicle. This is made possible by a targa top incorporating a transparent roof, which can be removed in a few simple steps to switch to open-top driving.
"To make the roof easy to handle and also reduce its weight significantly, we opted to use Makrolon?in our design. This polycarbonate from Bayer MaterialScience is an established material for the series production of lightweight automotive glazing. We were also keen to benefit from the Leverkusen company's know-how, which covers all process steps in the manufacture of polycarbonate glazing," explained Daniel Starmann, Glazing Project Manager- Exterior Engineering Department, Bugatti.
One example of this expertise is a new generation of infrared (IR)-absorbing colors developed by Bayer MaterialScience to meet the requirements of the Volkswagen Group, which includes the Bugatti brand. This is being used for the first time in a series application for the removable targa top. The shade of gray chosen filters the IR part of the sunlight at least as effectively as the corresponding IR colors for glass. As a result, the vehicle interior does not heat up as much under the effects of sunshine.
The roof is made by KRD Sicherheitstechnik GmbH, a German company based in Geesthacht. KRD already has many years of experience in the manufacture of lightweight and safety glazing made from polycarbonate sheets for automotive applications and covers the entire process chain. The Bugatti's roof is made from solid sheets of the polycarbonate Makrolon?GP grey 722 that are 5mm thick. Bayer Sheet europe GmbH produces these from Bayer MaterialScience's polycarbonate Makrolon?AG2677, which is specifically formulated for automotive glazing. Bayer Sheet europe has refined the extrusion process for this highly transparent high-tech material to ensure that the sheets are free of streaks, distortion, surface flaws and impurities. As a result, they meet the extremely high optical quality demands for glazing applications.
Strict test regulations with narrow tolerances
KRD prints the sheets with a black border before thermoforming them and coating them with the AS4000 polysiloxane wet-coat system from Leverkusen-based company Momentive Performance Materials GmbH. This makes the panoramic roof highly scratch- and weather-resistant. The next step is to mill the edges. Last but not least, BBG GmbH in Mindelheim sprays on a polyurethane edging. "The challenge for us given the small quantities involved was to quickly produce a component that satisfies the automaker's strict test regulations and narrow tolerance requirements despite the numerous steps involved in the manufacturing process," said Korinna Brammer, MD, KRD.
Despite being 1,230mm long and up to 1,050mm wide, the roof weighs no more than around 5.6kg, including the polyurethane edging. As a result the entire targa top weighs in at just 13.5kg, which makes it easy to handle. "By using Makrolon?instead of glass of the same thickness, a weight reduction of up to 50% can be achieved. This demonstrates the great weight-saving potential of our polycarbonate for automotive glazing," stressed Dr. Sven Gestermann, Key Account Manager - Automotive Glazing at Bayer MaterialScience.
Fast drive with a cool head
The new IR-absorbing colors offer plenty of scope when it comes to glazing colors. Appropriately treated glazing made from Makrolon?AG2677 enables very low energy transmission values with dark colors. For example, the color used for the Bugatti's roof achieves a direct solar transmittance value of approximately five percent. What's more, polycarbonate glazing offers effective protection against UV radiation, which is responsible for a great many aging processes affecting components in vehicle interiors.
About Bayer MaterialScience
With 2009 sales of

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