Germany Ruihao-the world's leading producer of crosslinked polyethylene (PEX) pipes.
German Ruihao Company began to produce crosslinked polyethylene PEX pipeline on 1972, with a history of more than 35 years and rich experience in PEX pipeline production and application. German Ruihao Company is also the first company in Europe to apply PE-Xa pipeline to floor heating system. German Ruihao Company introduced the floor heating system to the market on 1985, and has rich experience in the development, application and installation of floor heating system for more than 20 years. Ruihao Company is the world's leading supplier of floor heating system products. High-quality PE-Xa pipeline and high-safety PE-Xa pipeline have more than 30 years of production experience. Ruihao has produced hundreds of millions of meters of cross-linked polyethylene (PE-Xa) pipes. The oxygen permeability of the pipeline meets the requirements of German DIN 4726 standard. Pipeline connection technology has been tested for millions of times and can withstand harsh construction environment and conditions. Introduction of heating pipeline in Ruihao Lautes.
1. 1 pipeline material
Rehaultham S heating pipe is made of oxygen barrier layer composed of high-density crosslinked polyethylene (PE-Xa) and polyvinyl alcohol (EVOH) by twin-screw extrusion process, so the crosslinking uniformity is better than that of piston/single-screw extrusion process.
PE-Xa is the basic material of Lautham heating pipeline, which is made by peroxide crosslinking (Engel method). The cross-linking process of this method is that under high temperature and high pressure, cross-linking reaction occurs with peroxide, and single polyethylene long chain molecules are chemically connected to form a three-dimensional network chemical structure, which significantly enhances the physical and mechanical properties of polyethylene. Compared with ordinary polyethylene, it improves a series of physical and chemical properties of polyethylene, such as tensile strength, thermal strength, aging resistance, dimensional stability, stress cracking resistance and chemical resistance.
The EVOH oxygen barrier layer extruded together with the cross-linked polyethylene pipe is the polymer with the best barrier effect, which is far higher than the oxygen permeability requirement stipulated in the German DIN4726 standard. There is an adhesive layer with strong adhesion between the cross-linked polyethylene pipeline and the oxygen barrier layer. The water-insoluble EVOH oxygen barrier layer enhances the wear resistance and corrosion resistance of the pipeline. RAU-PE-XA100%100% RAU-PE-xaevoh HV-99.6%-99.6% According to the provisions on oxygen permeability in the German DIN 4726 standard, the oxygen permeability of heating pipes shall not exceed 0,10g/(m x d)。
After testing, the oxygen permeability of Ruihao heating pipeline is only 0.0035 g/(m&:sup3; x d)。
Types and comparison of crosslinked polyethylene (PEX) pipes
According to the different production processes of crosslinked polyethylene pipes, they can be divided into peroxide crosslinking (PE-Xa), silane crosslinking (PE-Xb) and radiation crosslinking (PE-Xc).
Peroxide crosslinking (PE-XA): a production process developed in 1970s. Peroxide crosslinking is the decomposition of peroxide mixed in polyethylene into free radicals during extrusion, which leads to the formation of active free radicals in polyethylene polymer chains and crosslinking. There are three main methods to produce crosslinked polyethylene pipes with peroxide. German Ruihao Company adopts Engel method. The crosslinking reaction of this method occurs above the melting point of polyethylene, so the pipeline structure is quite uniform.
Silane crosslinking (PE-XB): 1973, Dow Corning Company developed silane crosslinking technology. Vinyl silane containing double bonds reacted with molten polymer under the action of initiator (usually peroxide) to form silane graft polymer, which was hydrolyzed in water in the presence of silanol condensation catalyst to form a network siloxane bond crosslinking structure. Disadvantages: Toxic in hot water.
Electron beam crosslinking (PE-Xc): It first started in the United States in 1955, and the crosslinking reaction was carried out by physical methods. Physical methods are characterized by the use of external radiation sources, usually using electron beams (B-rays) generated by large accelerators in production. Polyethylene with a thickness of 0.55-65 and 438+0-3 mm needs 0.55-0 MeV energy respectively. Its main advantage is that it belongs to post-crosslinking technology, but its disadvantage is limited crosslinking depth.
The national standard GB/T 18992-2003 stipulates the minimum crosslinking index of crosslinked polyethylene pipes produced by different crosslinking methods. See the following table: Minimum crosslinking degree of pipelines with various crosslinking methods: peroxide crosslinking (PE-Xa) 70% silane crosslinking (PE-Xb) 65% electron beam crosslinking (PE-Xc) 60% Performance comparison of crosslinked polyethylene pipelines produced with various crosslinking methods: peroxide crosslinking (PE-Xa) silane crosslinking (PE-Xb). Thermal stability of electron beam crosslinking (PE-Xc), 95 C 1 2-3 2 failure time, 95 C12-32 stress cracking resistance 1 1 22-4 thermal conductivity 2 2 2 flexibility12-32. Qualitative 1 2-4 2-4 oxidation induction time, 200 c 3 1 1 creep resistance11Note: 1- Very good; 2- good; 3- Satisfied; 4- There is a problem.
Source of the above data: Polyolefin Pipeline, edited by Sun Xun, Beijing: Chemical Industry Press, 2002.
According to the above performance comparison, the performance of PE-Xa pipeline is the best among all PEX pipeline types.
1.2 pipeline characteristics
Excellent durable strength and high-temperature stability, high temperature resistance up to 1 10℃, remarkable memory (self-repairing ability), rapid expansion and slow reduction of good impact strength, low-temperature impact strength as low as -50℃, excellent chemical corrosion resistance and wear resistance, and will not be destroyed by tiny cracks.
Ruihao PE-Xa heating pipeline can be used in any harsh outdoor laying environment and maintain its excellent material properties.
1.3 performance index unit test method for physical and mechanical properties Test value density g/cm DIN 53497 0.93 Thermal conductivity w/m k din 52612-1.35 linear expansion coefficient 10K DIN 53752 A 1 .5 impact strength 20 c-20 c unbroken elastic modulus n/mm din 53457 600 40 c oxygen permeability g/mx d0. 1 pipeline surface roughness mm0.007 1.4 construction performance of Ruihao pipeline.
Excellent memory. When the dead-folded pipeline is formed on site, it is not necessary to cut the pipeline and connect it with pipe fittings. Just use a hot air gun to heat the dead angle area of the pipeline, and the pipeline can automatically make final contact. It has excellent crack insensitivity. If there are small cracks in the pipeline, it will not cause pipeline leakage during use. It has good weather resistance. The pipeline can be constructed normally under the conditions of extreme high temperature in summer (temperature higher than+40 C) and low temperature in winter (temperature lower than+5 C). Especially at low temperature, the pipeline will not become brittle, and 180 can be bent. Ruihao Pipeline was built under the condition of-10℃ in China. With its excellent low temperature stability, it successfully replaced the European brand PB tube used in MOMA Phase I project. Quick and simple pipe connection. Ruihao pipeline can pass water in the pipeline, and it can run immediately after the pipeline connection is completed, which greatly shortens the pipeline maintenance time. 1.5 ruihao pipeline connection technology
Ruihao company's proprietary durable and leak-free fastening coupling connection system (from cutting-edge industrial connection technology).
Advantages of Ruihao tight coupling connection
The pipe fittings are made of dezincification-resistant brass (DZR)- corrosion-resistant, and the connection is safe and reliable-without O-rings.
Highly safe and easy to use.
After more than one million experiments and tests, it is durable and leak-free.
Visual inspection using this pipe fitting to repair damaged pipes is very quick and simple.
Ruihao's door and window system, heating and building piping equipment, fire protection and piping system are combined to provide efficient solutions in an integrated way. In the ground source heat pump pipeline system, responsible for the domestic market sales of Swiss-European ground heat pipes.
RAUGEO Geothermal System: PE- 100 Geothermal Pipe Product Features: 1. The raw materials are CRP 100 and PE 100 of BASELL Company.
2. Its U-bend can be safely installed to enhance the flow.
3. Mafei-KrausMafei professional pipeline extrusion production equipment.
4. Do not add or use recycled materials, and do not add carbon black to raw materials.
5. Butt welding and welding equipment are fully controlled by computer and completed in Ruihao Taicang Factory.
6. Strictly controlled quality system and excellent quality assurance.
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