Polybutene (PB) is a kind of polymer inert polymer, born in the 1970s. It has high temperature resistance, durability, chemical stability and plasticity, non-toxic, tasteless, odourless, is currently one of the world's most sophisticated chemical materials, has a "plastic gold" reputation. The material is light in weight; Good flexibility; Corrosion resistance, high temperature resistant characteristics especially when used in pressure piping, can be long-term use under 95 ℃, the highest temperature can reach 110 ℃. The surface roughness of pipe is 0.007, no scale, no heat preservation, water quality, good effect.
The high and low temperature of PB tube is far superior to PPR. The molecular structure of the two materials is completely different and the molecular weight is different. PPR can not be used as a high temperature radiator heating (water inlet 80 degree),70 degree is the life inflection point of PPR, and PB is different. In the next 50 years, polybutylene (PB), the application of the pipeline system has been constantly promotion, connecting line is applied to building the radiator heating system, floor radiant heating system and hot and cold water piping system. Polybutylene (PB) resin is composed of carbon and hydrogen polymer, compared with the traditional materials such as metal and ceramic, easy to machining, easy to recycle, the whole life cycle energy consumption is low, is a green environmentally friendly materials. From the perspective of structure, polybutene (PB) is a semi-crystalline thermoplastic material with a linear homogenous structure, which is non-toxic and non-toxic during processing and use, and can be repeatedly heated and formed. Therefore, polybutylene (PB) integrated health, machining, surface roughness, strength, flexibility and the advantages of the connectivity, the physical properties and thermodynamic properties and functional aspects of the comprehensive balance, thus giving the polybutylene (PB) many advantageous traits, plastic pipe material in the fluid conveying system, especially the building hot water system area opened up a wide place.
In addition to the other plastic pipe, it is the most excellent pressure resistant pipe in many pipes. Its long-term use of the ring to stress tolerance is the highest. 20 oC in medium, the system pressure 16 bar, medium 70 oC, the system pressure bar and 10 95 oC, the system pressure 6 bar three different cases can ensure safe and reliable operation of 50 years, the safety factor of 1.5.
There is little hydraulic loss. Due to the high heat resistance of PB materials, the PB pipe in all plastic pipes can have the smallest wall thickness without compromising the safety and reliability in the determination of the wall thickness of the pipe. Compared with other plastic pipes with the same outer diameter, PB tube has the greatest advantage of inner diameter. The liquid has good fluidity and relatively large flow, thus saving water, energy and raw materials. Its thermal conductivity is only 1/250 of the steel tube and 1/1700 of the copper tube, so its thermal insulation effect is strong.
The best drinking water pipe. Polybutene is a highly inert polymer material with high chemical stability. Microorganisms can not grow, and are currently the most hygienic standard drinking water supply pipes in the world.
The best wear resistance performance. The wear resistance of PB pipe has been proved to be higher than other thermal plasticity tubes. In particular, the high temperature of 82oC also has a long lasting force. At 23 oC, P B tube was 2.6 times more durable than PE tube. At 82.2 oC, PB tube was 60 times higher than PE tube.
Strong resistance to temperature stress. With the same diameter of 32mm, the length of 10m, the temperature difference 50oC for the expansion force test, polybutylene is 48kg, polypropylene is 178kg, crosslinked polyethylene is 253kg, polyvinyl chloride 310kg, copper 15kg, steel 2050kg.
The creep properties of the tubes are excellent. Polybutylene pipe in the process of extrusion, partially crystalline polyolefin will generate different crystal shape, when cooling, the half on the stability of crystal shape is generated, the final transition to a stable shape. The crystallinity increased from 25% to 50% during this process. Therefore, PB tube has great resistance to stress crack. The performance of this resistance can also be confirmed by the creep resistance. Beijing design institute senior engineer a non-working in its polybutene technical performance and application of the feed pipe, the article have such a words: "polybutylene (PB) creep elongation is very small, small creep elongation has a great resistance to stress cracking, which makes the pipeline in the connection part of the tensile strength and sealing pressure not weakened with the increase of time". At the same time, due to the effect of polybutene (PB) on the creep strength, as time increases, the stress caused by the pipe during deformation will not change much, or the stress decrease rate will not change much. Under the action of this stress, good thermal resistance of the pipe is maintained. This is also beneficial to the tensile strength and sealing pressure of the pipe joints that do not decrease over time. Fu wenhua, a senior engineer at the ministry of construction, has said that only polybutenes can be tested in the earthquake in Osaka, Japan. Other tubes are broken, but only polybutenes are destroyed.
Excellent connections of pipe joints. Xing ji long polybutene tube USES the world recognized safe connection mode -- hot melt connection.
Energy conservation and environmental protection. Plastic is a kind of energy saving material. The oil consumed by each liter of plastic, steel, copper and aluminum is 1.5kg, 4.5kg, 11kg and 15kg respectively. For polybutylene (PB) pipe, also because of the small wall thickness, save material, and in the same pipe diameter has a large area of unit length head loss under the condition of small hydraulic conditions, make the polybutylene (PB) pipeline has the advantages of more energy-saving than other plastic pipe. In the case of plastic, it is mainly used for PB, PE, PP, pvc-c, and PEX is not reusable.
With good oxidation stability (good aging resistance), the tube is placed in the oxygen flow of 220oC by oxidation induction test (OIT test) to observe its stable time. The PB tube was 35.78 minutes, while the crosslinked polyethylene was different in polymerization method and the polymerization degree was different, and the stable time was changed in the range of 1.71-28.3 minutes. The results show that PB tube has excellent anti-aging properties.
Attending the construction of the excellent performance, low temperature floor heating within the concrete, the pipe into the room together life basic synchronization, with the passage of time, the other plastic tubing damage probability is much more bigger than polybutylene.
Plastic pipe buried in concrete, although very detailed construction requirements, also have asked to decorate the ground, but in the process of construction, in decorating a building process, have intention to not intentional of partial destruction is difficult to avoid, then USES the polybutylene pipe is easy to repair, the durable performance as well as pipes. However, the only way to solve the problem with crosslinked polyethylene or aluminum-plastic pipe is to connect with metal joints, so that the hidden danger is buried in the concrete, and the water seepage will occur in a few years. Some foreign countries clearly stipulate that the metal joint does not allow for dark application, only to be installed. Shanghai clearly stipulates that metal joints are not allowed into the wall. Polybutene tubes have been successfully applied in dozens of projects in China since 1995, and no accidents have occurred due to quality and joint. Therefore, the use of polybutylene tube heating is not comparable to other materials. These excellent performances make it the best pipe in the field of heating.
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