Hello, yes.
The melting point of PPR pipe is 260 degrees and it will vaporize when the water temperature exceeds 95 degrees.
It is therefore completely usable. PPR is also used for underfloor heating and water supply in the north, and the temperature is even higher.
I hope it can help my friends
Whether it is ppR or aluminum plastic for solar energy
It is PPR pipe .
PPR (random polypropylene), also called random copolymerized polypropylene (PPR), has good toughness, high strength, excellent processing performance, good creep resistance at higher temperatures and has random copolymerization properties. advantage of high transparency and can be widely used in the production of pipes, sheets, daily necessities, packaging materials, household appliance componentsrs and various films.
PP-R pipe is also called Type III polypropylene pipe and random copolymerized polypropylene can be extruded into pipes or injection molded into pipe fittings. Polypropylene random copolymer is also a type of polypropylene. The basic structure of its polymer chain is modified by the addition of different types of monomer molecules. Ethylene is the most commonly used monomer that modifies the physical properties of polypropylene. Compared to the PP homopolymer, the random copolymer exhibits improved optical properties (increased transparency and reduced haze), improved impact resistance, increased flexibility, lower melting temperature and therefore lower thermal welding temperature; also essentially identical to homopolymers in terms of chemical stability, water vapor barrier properties and organoleptic properties (low odor and taste). It is used in the fields of blow molding, injection molding, film and sheet extrusion processing, and is used as food packaging material, pharmaceutical packaging material and daily consumption goods.
Is it better to use PE pipe for solar hot water pipe inlet pipe or PPR pipe for domestic use?
Both are acceptable . The advantage of PPR pipe is hot melt connection after. the connection, hose and pipe fittings are integrated into one, and there will be no risk of water leakage, but the disadvantage is that its normal working temperature is around 70 degrees if the temperature water in your water heater is too high. high and reaches more than 90 degrees, it will cause premature aging of the PPR pipe. Therefore, PPR pipes are generally not directly connected to the sun. Even if they are stupidsides. Typically, the section of pipe directly connected to the solar will be replaced. every one to two years. The advantage of aluminum-plastic pipes is that it has better high temperature resistance than PPR pipes, but the disadvantages are more serious than PPR, because aluminum-plastic pipes are mainly connected with fittings of threaded pipes, mainly relying on rubber seals to keep out water. leak, but rubber seals are less likely to leak at high temperatures. The aging speed is much faster than that of PPR, and the hidden danger of water leakage is serious.
There seems to be a pipe called "Youjia Steady State Pipe" on the market, which combines the advantages of PPR and aluminum-plastic pipes. The outer layer is PPR, the middle layer is aluminum, and the middle layer is aluminum. the inner layer is nouvet in PPR. Like PPR, hot melt connection is used, which solves the problem of connecting aluminum-plastic pipes. The inner PPR layer blocks direct contact between aluminum and water, eliminating aluminum pollution. You can go to Baidu to search "Youjia Steady State Pipe" to learn more
Whether it is better to use aluminum-plastic pipe or ppr pipe for the water supply pipe of the solar water heater Pipe properly
Since the solar water heater is installed outdoors, it is recommended to use aluminum-plastic pipes.
1. The low temperature resistance of aluminum-plastic pipes is higher than that of PPR pipes. PR is fragile when cold (the fragility point is -20°C), special care is therefore required during construction in winter (below 5°C). Aluminum-plastic pipes show no cold brittleness(the fragile point is -70°C) and can be easily installed below -20°C.
2. The expansion coefficient of PPR pipes is high. Since the piping system is rigid and straight, the PPR pipe itself cannot digest the deformation, so it is easy to cause bending, deformation and leakage of the piping system. Aluminum pipes are made of aluminum. Taken together, their linear expansion coefficient with aluminum is approximately 0.025 mm/m.
The temperature is ℃, which is 1/6 of the PPR pipe. Affected by temperature changes, the deformation is small, while the aluminum pipe is a flexible coil. The hose itself can absorb a certain amount. deformation and will not cause thermal deformation of the piping system.
3. PPR pipe has poor aging resistance. The structure of the PPR molecular chain - (-CH2—CH-)n- contains a largenumber of unstable tertiary carbon atoms, which are more sensitive to CH3 light and oxygen. , and impurities (such as copper, iron ions) and aging. Therefore, the PPR product manual generally stipulates that the open air stacking time should not exceed six months.
PE plastic used in aluminum-plastic composite pipes has a molecular chain structure - (-CH2-CH2-)n-, which is the most stable structure among plastics, and the layer d The aluminum in the middle of the aluminum-plastic pipe insulates the inner and outer layers, the outer plastic layer can add sufficient stabilizers to resist aging by light and oxygen without affecting the hygiene of the inner layer that enters. in contact with water.
Detailed information:
Thes advantages of aluminum-plastic pipes can be summarized in the following three aspects:
1. Excellent hygienic performance: the outer layer made of aluminum-plastic. Plastic pipes are made from a special polyethylene material, which is clean and non-toxic. More importantly, the middle layer of the tube is made of aluminum, which not only insulates light but also blocks oxygen. It is well known that the environment in which microorganisms grow requires light oxygen. The aluminum interlayer of aluminum pipes will eliminate the growth of microorganisms and algae that plastic pipes cannot reach.
Not only do plastic pipes contain high amounts of antioxidants, which prevent material degradation, but when the antioxidants are extracted from the water held in the pipes, they can also cause water pollution. the water.In addition, because there is no photoresistant material in the entire plastic pipe, microorganisms are easily generated, causing secondary pollution of water quality.
2. Excellent high and low temperature resistance: the long-term use temperature is 95°C (50 years, IMPa), the maximum use temperature is 110°C, and the aluminum plastic pipe has a low coefficient of thermal expansion. . It is equivalent to the thermal expansion coefficient of aluminum and only one-sixth of the total number of plastic pipes. When the temperature changes, the deformation is very small and the aluminum plastic pipe is a flexible coil. The pipe itself can absorb a certain amount of deformation and will not cause thermal expansion deformation of the piping system.
The whole plastic pipe has poor high and low temperature resistance.The temperaLong-term use temperature of PPR is only 70 degrees (50 years, IMPa) and the maximum use temperature is 95 degrees. At the same time, the expansion coefficient of PPR pipes is high, and when the external water temperature (hot and cold water) changes, a large initial deformation occurs. Since PPR pipes are straight and rigid pipes, they cannot absorb deformation, which can easily cause the system to bend, deform or even leak.
3. Long service life: PE plastic multi-tube aluminum mold, the molecular chain structure (CH2 - CH2 -) used is relatively stable in the plastic, and. As an insulation layer between the inner and outer aluminum layers of the tube, plastic can be added to the outer layer to repel light stabilizers and oxygen aging without affecting the hygiene of the internal contact With lwater, thus improving its anti-aging performance.
Since the solar water heater is installed outdoors, it is recommended to use aluminum-plastic pipes.
1. The low temperature resistance of aluminum-plastic pipes is higher than that of PPR pipes. PR is fragile when cold (the fragility point is -20°C), special care is therefore required during construction in winter (below 5°C). Aluminum-plastic pipes have no cold brittleness (the brittle point is -70°C) and can be easily installed below -20°C.
2. The expansion coefficient of the PPR pipeline is high. Since PPR pipe is a rigid straight pipe, it cannot absorb deformation, so it is easy to cause bending, deformation and even leakage of the pipeline system. Aluminum-plastic pipe is composite with aluminum. As a whole, its coefficient of expansionn linear is equivalent to that of aluminum, about 0.025mm/m·℃, which is 1/6 of PPR pipes. Therefore, when subjected to temperature changes, the pipe is made of aluminum and plastic. the amount of deformation is small and the aluminum-plastic pipe is a flexible coil, and the pipe itself can absorb a certain amount of deformation and will not cause thermal expansion and deformation of the piping system.
3. PPR pipe has poor aging resistance. The PPR molecular chain structure - (-CH2—CH-)n- contains a large number of unstable tertiary carbon atoms, which are more sensitive to CH3 light and oxygen. , and impurities (such as copper, iron ions) and aging. Therefore, the PPR product manual generally stipulates that the open air stacking time should not exceed six months. PE plastic used in aluminum-plas composite pipestick has a molecular chain structure - (-CH2-CH2-)n-, which is the most stable structure among plastics and because the aluminum layer in the middle of the aluminum-plastic pipe separates. To the inner and outer layers, the outer plastic can add enough stabilizer which resists aging by light and oxygen without affecting the hygiene of the inner layer in contact with water.
Develop knowledge
Advantages of aluminum-plastic pipes
The advantages of aluminum-plastic pipes can be summarized in the following three aspects:
p>1. Outstanding hygienic performance: The inner and outer layers of the aluminum-plastic pipe are made of special polyethylene materials, which are clean and non-toxic. The most important thing is that the middle layer of the aluminum-plastic pipe is made of aluminum, which not only blocks light butalso oxygen. As we all know, the environment suitable for the growth of microorganisms must contain light and oxygen. The aluminum core layer of the aluminum-plastic pipe prevents the growth of microorganisms and algae, which is beyond the reach of all-plastic pipes. Not only do all-plastic pipes themselves add a large amount of antioxidants to prevent material degradation, but the antioxidants are extracted into the water retained in the pipes, which can easily cause water pollution, because they do not block light or oxygen. -By blocking materials in all-plastic pipes, it is very easy for microorganisms to breed and cause secondary pollution of water quality.
2. Excellent high and low temperature resistance: the long-term use temperature is 95 degrees (50 years, IMPa), theMaximum use temperature is 110 degrees, and the thermal expansion coefficient of aluminum-plastic pipe is low. . Its thermal expansion coefficient is equivalent to that of aluminum and only one-sixth that of all-plastic pipes. When subjected to temperature changes, the amount of deformation is small and the aluminum-plastic pipe is a flexible coil. The pipe itself can absorb a certain amount of deformation and will not cause thermal expansion or deformation of the piping system. The high and low temperature resistance of all-plastic pipes is relatively poor. The long-term use temperature of PPR is only 70 degrees (50 years, IMPa), and the maximum use temperature is 95 degrees. At the same time, the expansion coefficient of PPR pipelines is high. When the external water temperature (hot and cold water)changes, there will be a large amount of original deformation. Since PPR pipes are rigid straight pipes, they cannot absorb deformation. , so they can easily cause the system to bend, distort or even leak.
3. Long service life: The molecular chain structure (-CH2-CH2-) of PE plastic used in aluminum-plastic composite pipes is relatively stable among plastics, and because the aluminum layer in the middle of the aluminum pipe -plastic separates the inner and outer layers Insulation, the outer plastic layer allows the addition of sufficient stabilizers to resist aging by light and oxygen without affecting the hygiene of the inner layer in contact with water, improving thus its anti-aging performance.
PPR pipe
Main advantages
1. Lightweight
The density at 20℃ is 0.90g/cm3 and the weight is only that of steel pipes. A neighth of the copper pipe, one tenth of the copper pipe, light in weight, greatly reducing the intensity of construction.
2. Good heat resistance
The instant use temperature is 95°C, and during long-term use, the temperature can reach 75°C. This is currently the most ideal indoor temperature. hot and cold water pipe.
3. Corrosion Resistance
Non-polar materials have no chemical effect on any ions in water and building chemicals, and will not rust or corrode.
4. Low thermal conductivity
It has good thermal insulation performance when used in hot water systems, there is generally no need for additional thermal insulation materials.
5. Small pipeline resistance
The smooth inner wall of the pipeline makes the current resistanceroute smaller than that of metal pipelines and the energy consumption is lower.
6. The pipe fitting is firm
It has good hot fusion performance connects pipes and fittings of the same material into a perfect whole, eliminating the risk. water leak.
7. Hygienic and non-toxic
It does not pollute the environment during production, construction and use, and is an environmentally friendly building material.
Reference materials:
PPR pipe from Baidu EncyclopediaReference materials: < /strong>
Aluminum plastic pipe from Baidu Encyclopedia