PP-R is the abbreviation for random polypropylene, also known as type 3 polypropylene.
In 1957 a first industrial production of polypropylene was carried out. Due to its excellent resistance to heat, pressure and corrosion, it became the material preferred by users. At the end of the 70s, polypropylene was considered the material of the hot and cold water supply pipes of the future. This was the first generation of polypropylene, which was named PP-H, short for homo-polypropylene. However, although it had excellent resistance to heat (<110 ° C) and pressure (MRS = 10 MPa), its poor resistance to impact at low temperatures did not make it suitable for the construction of hot and cold water supply pipes.
For this reason, an attempt was made to improve the impact resistance at low temperature by modifying PP-H, giving rise to the second generation of polypropylene, which was obtained by adding a certain amount of vinyl monomer during the polymerization process of polypropylene. It was named PP-B or PP-H, which is the abbreviation for copolymerized polypropylene block. Although PP-B was a breakthrough in low temperature impact resistance, on the contrary, its resistance to heat was reduced. PP-B could only be used in cold water pipes or in hot water pipes in low pressure conditions.
In the late 1980s, a European petrochemical company broke the traditional process (liquid phase) of polymerization of polypropylene and adopted advanced polymerization technology (gas phase), which synthesized a random copolymer of propylene and ethylene. The copolymer was called random polypropylene (PP-R), with an ethylene content of less than 5%, which is randomly distributed in the polypropylene molecular chain. This PP-R, which is created through the new polymerization process that takes advantage of PP-H's heat resistance and low-temperature impact properties of PP-B, is suitable for the manufacture of piping systems for supply. hot and cold water inside buildings.
FIELDS OF APPLICATION
- Drinking water pipe networks to supply cold and hot water in civil buildings (residences, hospitals, hotels, offices, schools …) or naval buildings.
- Industrial pipe networks for food products, chemicals and the electrical industry. For example, for the transport of corrosive fluids (acid or alkaline water and ionized water, etc.).
- Pipe networks for purified water and mineral water.
- Pipe networks for air conditioning equipment.
- Pipe networks for heating systems.
- Pipe networks for rainwater harvesting systems.
- Pipe networks for swimming pool installations.
- Pipe networks for agriculture and horticulture.
- Pipe networks for solar energy installations.
- Light weight. The density of the pipe is only 0.89-0.91 g / cm3 (only 1/9 of the steel pipe and 1/10 of the copper pipe). This makes handling and installation more practical.
- Good resistance to heat and pressure. The Vicat softening point reaches 131.3 ° C. Its short-term operating temperature can be up to 95 ° C. And below the temperature of 80 ° C it can still withstand some pressure in the long term. This is the best choice for cold and hot water supply pipes in buildings.
- Long useful life. When the working temperature is 70 °C and the working pressure is 10 kg / cm2, its useful life can reach around 50 years.
- Good corrosion resistance. PP-R pipes have excellent corrosion resistance against most ions and inorganic chemicals in buildings. It is, therefore, anticorrosive and does not rust in the long term.
- Reliable and comfortable connection. PP-R has excellent fusion welding performance. The pipes and fittings are made of the same material, allowing them to be joined by fusion welding. Compared to plain pipe, the tensile, flexural, and impact resistance at joints is much higher, so preventing the danger of leaks. In addition, this type of connection makes installation easier and more reliable.
- Non-toxic and harmless. PP-R belongs to thermoplastic polyolefins, and its molecules are only composed of carbon and hydrogen.
- Good thermal and acoustic insulation property. The conductivity coefficient of PP-R is 0.23 w / m ° C, only 1/200 of that of steel (43-52 w / m ° C). There is no need to use insulating materials when used in hot water systems, resulting in savings in materials and energy. And its reduced noise when water is supplied through the piping system means a better rest at bedtime.
- Increased water throughput. The smooth inner surface of PP-R pipes and fittings has less friction, ensuring high flow.
- Environmentally friendly construction material. During production, installation and application, the contamination that occurs is minimal. Also, the materials are recyclable, which implies the minimum consumption of resources.