Plastic Pipes Conference Association # 2021 Amsterdam
Lei Wang, Guozhi Xu, Qiaoping Qiu, Weihua Lu, Yanwang Han
PP-R (random copolymerized polypropylene) has been widely used in hot and cold water systems. However, the standard PP-R pipes have the disadvantages of a large high-temperature thermal expansion coefficient, an insufficient notched impact strength, and a low temperature and pressure resistance.
In this paper, a new material is used to reinforce PP-R. Basalt, which has been widely used in the industry, can greatly improve the mechanical properties of PP-R and PP- RCT pipes. The mechanical strength has been improved by around 20%. In addition, using basalt in the fiber-reinforced PP-R composite pipe with multi-layer coextrusion, allows to reduce the linear expansion coefficient from 0.16 mm / (m · °C) to 0.05 mm / (m · °C), and the longitudinal reversion from 2% down to 0.3%. The Basalt fiber-reinforced PP-RCT composite pipe can withstand temperatures 15-20°C higher on the long term, making the pipe more versatile for hot and cold water systems. Furthermore, an antibacterial PP-R composite pipe was developed, which inhibits the metabolism , reproduction and accumulation of bacteria inside the pipe. These features provide cleanliness and safety for residents using the drinking water.
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