The ppr tube material ppr tube data is made from random copolymerized polypropylene as a base material and modified. The random copolymer polypropylene adopts an advanced gas phase copolymerization process to randomly and uniformly polymerize PE in the molecular chain of PP to obtain more excellent performance. PP-R material is one of the best comprehensive pipe materials.
The difference between PP-B, PP-H and PP-R:
The ppr pipe special material is divided into three generations: the first generation is modified by homopolypropylene, called PP-H, and the second generation is made by polymerization of PP and PE block copolymerization process, called PP-B, the third generation. Modified by random copolymerized polypropylene, called PP-R, the main difference is:
1. The processing performance and environmental stress cracking resistance of these three materials are improved in turn;
2. PP-B has poor strength and good impact resistance. PP-H has good strength and poor impact resistance (brittle), while PP-R prevents this defect.
3. PP-B and PP-H pipes are made to drop significantly after one year, while ppr pipes adhere to higher strength even after 50 years;
4. Some special types of imported PP-B, the performance is close to PP-R, is also an excellent pipe material.
Ppr tube advantages:
Ppr pipe can be used for up to 50 years under the condition of long-term continuous working water pressure and water temperature up to 95 °C. It is widely used in the world for its outstanding hygienic, environmental performance and heat, pressure, corrosion resistance, flexibility and seismic performance. Attention is paid to the use of hot-fusion technology in the hot and cold water supply project of PPR pipe. Its comprehensive technical performance and economic indicators are superior to galvanized pipe, UPVC pipe, PEX pipe, polyethylene pipe and aluminum-plastic composite pipe. It is a thriving water supply in Europe and America. One of the leading products of the pipeline.
Identify the ppr tube:
Take a little PP-R material or ppr tube to ignite with a lighter. If it is not black after ignition and can pull out a long filament, the data used is PP-R material. If it is black, it is definitely not PP-R material. At present, there is a phenomenon in the market that PP-B, PP-H and PP-C impersonate PP-R, so please pay attention to it.
Ppr tube selection:
Ppr pipes are widely used in industrial and residential buildings, sanitary drinking water and hot water heating. The ppr pipe is divided into two types of hot and cold water pipes. The wall of the cold water pipe is thin, and the wall of the hot water pipe is thick. Therefore, the performance of the hot water pipe is much better in terms of fracture resistance, and the hot water pipe is also more expensive than the cold water pipe. In order to be safe, many manufacturers do not split the hot and cold water pipes during the construction process to improve the safety factor.
1. Good soft ppr pipe, the pipe is not easy to be deformed by extrusion, even if the deformation does not break, and the joint usage is greatly reduced.
2. Corrosion-resistant waterproof scaling The chemical properties of PR-R pipes and fittings are resistant to chemical elements in the water, while the smooth inner surface prevents scale formation.
3. High temperature resistant, high pressure resistant PR pipe, the pipe is subjected to a water pressure of 45 kg/cm 2 at normal temperature, and the pipe does not deform at a temperature of 112 ° C.
4. Long life ppr pipe, pipe fittings anti-aging, normal mission for more than 50 years.
5. Simple and fast construction of ppr pipe, the flexibility of the pipe fittings makes the construction very fast, and easy to connect (with hot melt machine socket connection), safe and reliable.
6. Affordable Due to the simple construction, there is no contradiction and influence between other projects, shortening the construction period, and the construction cost is 60% less than that of the copper pipe, which has superior economical efficiency.
Therefore, consumers should be cautious when purchasing, be sure to choose the right, quality manufacturers of quality, and also pay attention to the installation, you may wish to listen to expert advice.
Expert advice: Let professionally trained technical workers operate. At the same time, the process is also very important. According to the principle of horizontal and vertical, a deep groove larger than the diameter of the water pipe should be grooved on the floor of the room, and then the PPR water pipe should be laid, followed by hot-melt connection one by one. After all the PPR interfaces are combined by hot melt technology, it is necessary to perform a pressure test for more than 24 hours. If the on-site environment permits, the pressure test time may be longer. When it is ensured that there is no water leakage, it will be landfilled.
The pros and cons of the ppr water pipe:
A look: the excellent ppr tube is bright and oily, and the inferior ppr tube is not natural because of the inferior plastic and even the lime powder. The cut section is dry and oil-free, and it feels like taking part in chalk ash.
Second touch: Excellent ppr tube inner and outer wall lubrication, no concave and convex cracks, inferior ppr tube inner and outer walls finely concave and convex.
Sancha: The quality of the excellent ppr tube is heavier than that of the inferior ppr tube. Due to the excellent PP-R metal fittings, there are a few copper parts with more than three waterproof leaking grooves (copper content is more than fifty-eight percent), copper. The parts are longer in size and thicker in thickness, so the PP-R tube is heavier in weight.
Four-burning: The fine ppr pipe raw material is a hydrocarbon chain compound. When the flame temperature is higher than 800 degrees Celsius and the fan-extinguishing condition is full of oxygen, the extinguishing is as long as the carbon dioxide and water vapor are released, and there should be no odor and residue when extinguished. Inferior ppr tubes are mixed with inferior plastics and other impurities. When they are extinguished, there is an odor and residue. The consumer can cut the sheet from the PP-R water pipe and use a lighter to extinguish it.
Ppr tube appearance:
The appearance of the ppr pipe qualified by the national standard rules should be fundamentally different. Regarding the appearance of the glare quality requirements of the pipe, the specification is only a rule of complex standards. However, in the daily inspection, the appearance of the ppr pipe brilliance is various, and some pipes are partially discolored or spotted, and the appearance brilliance cannot be uniform. Divergence; some surfaces are dull or have a bright, bright surface. All the parts are discolored, the surface is spotted, the surface is dim and dull, the surface is bright and bright, and the surface is bright and bright. The physico-mechanical functional targets are mostly unable to meet the specification requirements, and are easily broken during the application process. In addition, most of the pipes are bright and bright, or black and beautiful, but these pipes are mostly fake and inferior products, and their functional goals are far from the national requirements.
Partial discoloration, resulting in uneven glory of appearance:
(1) Causes. The ppr pipe is extruded from PP-R resin through an extruder. The function of the extruder can make the PP-R resin from the crystal to the high elastic state, and then re-plasticize into the process of melting and viscous flow. If the ppr raw material is subjected to heat and pressure during extrusion, The molecular configuration changes when the shape of the raw material changes. Excessive plasticizing temperature destroys the molecular structure of PP-R and synthesizes discoloration. At the same time, the extrusion speed is too fast, and a high conflict heat is generated in the barrel, so that the temperature of the material is lowered to synthesize discoloration.
(2) Control measures. In view of the special function of PP-R resin, in the process of requesting ppr pipe extrusion processing, it should avoid excessive plasticizing temperature and excessive extrusion speed, which may cause changes in the molecular structure of PP-R resin. Thus the idea of ​​an extruder screw for the consumption of a ppr pipe requires a conservative computer model that provides excellent high temperature plasticization and optimum extrusion speed. The configuration of the request screw is satisfactory for the PP-R material to be extruded at a lower temperature and an optimum extrusion speed, and to ensure the quality of the plasticization without reducing the amount of extrusion.
The screw barrel of the extruder used for consuming PP-R plastic pipe should accurately calculate the pressure distribution and melting rate of each section with a conservative computer model, so that it has excellent high temperature plasticizing ability.
Ppr pipe should pay attention to the problem during installation and construction:
1. The ppr tube has lower hardness and rigidity than the metal tube. It should be protected during handling and construction to avoid mechanical damage caused by improper external force. After the dark application, the position of the pipeline should be marked to avoid damage to the pipeline due to the secondary decoration.
2, ppr tube below 5 ° C there is a certain low temperature brittleness, winter construction should be careful, when cutting the tube with a sharp knife slowly cut. The installed pipelines should not be stressed or knocked, and if necessary, covered with protective parts.
3, ppr tube long-term exposure to ultraviolet radiation is easy to aging degradation, installed in the outdoor or direct sunlight must be wrapped with a dark protective layer.
4. In addition to the mechanical connection with threaded inserts or flanges, the ppr tube should be connected with metal inserts or flanges. The other parts should be hot-melt joints to make the pipelines integrated without leakage.
5, ppr tube linear expansion coefficient is large (0.15mm / m ° C), in the surface mounted or non-direct buried dark cloth pipe must take measures to prevent pipe expansion and deformation.
6. After the pipeline is installed, it must be tested before sealing (direct burial) and covering the decorative layer (not directly buried and dark). The pressure test pressure of the cold water pipe is 1.5 times of the working pressure of the system, but not less than 1 MPa; the test pressure of the hot water pipe is twice the working pressure, but not less than 1.5 MPa. Pressure test time and method technical regulations.
7. When the ppr tube is fixed or not directly buried, the branch and hanger must be installed as required.
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