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Car panoramic sunroof: the next demand for polycarbonate!

Time: 2018-10-24

Car panoramic sunroof: the next demand for polycarbonate!


People in the automotive industry can personally feel that the entire industry is experiencing a new round of unprecedented changes. Over the past few decades, with the ever-increasing shape and function of automobiles, various advanced materials have been applied to new designs and manufacturing. Polycarbonate (PC) is one of the most important ones.

When experts realized that the use of lightweight composite panels instead of high-strength metals would still have high-speed collisions, and this phenomenon would be very common, the use of plastic windows and columns to solve the blind zone problem became Better choice. Because pedestrian and vehicle collisions are usually caused by visual blind spots. Polycarbonate is the only transparent product among the five engineering plastics, and domestic and international demand is growing rapidly, especially in the automotive market. At present, the panoramic sunroof made of polycarbonate (PC) on the market is increasingly favored by car buyers.

Sabic-IP of the United States pointed out that the use of polycarbonate (PC) can innovate the design and installation position of the window and the mechanical system to open the window, plus the polycarbonate (PC) is lighter than the glass, and in the event of a collision It will not hurt the advantages of personnel, so the promotion and application prospects are excellent.

Webasto, a well-known German auto parts supplier, shares the same view: the car's panoramic sunroof boom is quietly emerging around the world. Take China as an example. As the world's largest auto market, one out of every three cars produced in China will be equipped with skylights or panoramic sunroofs. The high heat resistant polycarbonate can be directly vacuum sprayed with metal when producing the condenser and mirror sections. In vacuum spraying, the temperature reaches up to 200 °C. At this time, the surface of the product does not bulge, no fog spots, and no peeling. Due to the use of polycarbonate, the weight of the front lampshade is reduced by 0.5 to 1.4 kg compared to inorganic glass.

Compared to an equal volume glass material, the PC sunroof has a net weight of only 50% of its weight. As the concept of lightweight car has become more and more popular, Webasto believes that the market for PC skylights has great potential. According to Webasto experts, although the PC density is only 50% of the glass, the impact resistance of the material is outstanding. At present, the company has become the designated supplier of the Volkswagen Golf A7 car sunroof. The Volkswagen Golf A7 model PC sunroof is 98 cm long and nearly 1 meter wide, with a total weight of only 1.2 kg.

Although polycarbonate has excellent heat resistance, high rigidity, impact resistance, dimensional stability and good light transmittance, polycarbonate is required to be in polycarbonate because of its poor UV resistance and chemical resistance and easy to be scratched. The surface of the ester (PC) is coated to ensure excellent weathering and scratch resistance of the window. The current Exatec900 system, Momentive's AS4000, PHC587C and AS4700F coating systems have been widely used in polycarbonate (PC) windows (eg Smartfortwo, Mercedes SLK sunroof coating), these coatings can meet The requirements of the automotive industry have proven their long-term stability in actual use. According to experts, in the next 10 years, new polycarbonate (PC) automotive window glass will form a market of 5 to 6 billion US dollars.