Ultra-high molecular weight polyethylene (UHMWPE) is a kind of engineering thermoplastics with more than 3 million viscosity-average molecular weight.Download PDF
It differs from PE standard grades in its very high degree of polymerization. Ultra-high molecular weight polyethylene pipe has superior performance over conventional HDPE pipe such as very high wear resistance, impact resistance, intrinsically self-lubricating, anti-adhesion,low temperature resistance and excellent chemical resistance.
|Test items||Unit||Results||Test basis|
|Tensile yield strength||Mpa||34.9||GB/T 1040-2006|
|Tensile breaking strength||Mpa||38.8||GB/T 1040-1992|
|IZOD Impact strength||KJ/m2||137||GB/T 1843-1996|
|Elongation(sample size :80*10*4mm)||%||318||GB/T 1034-1998|
|Heat Deflection Temperature||℃||96||GB/T 1663-2000|
|Melt Temperature||℃||236||GB/T 1634-2001|
|Coefficient of friction||---||0.01||GB/T 0006 -2002|
|Ball indentation hardness||N/mm2||42.3||GB/T 3398-1982|
Ultra-high molecular weight polyethylene pipe has superior performance over conventional HDPE pipe such as very high wear resistance, impact resistance, excellent resistance to internal pressure strength, resistance to environmental stress cracking, intrinsically self-lubricating, anti-adhesion, low temperature resistance and excellent chemical resistance.
Ultra-high molecular weight polyethylene (UHMW full name is ultra-high molecular weight polyethylene pipe) is a thermoplastic engineering plastics with an average molecular weight greater than 1.5 million, which is polymerized by ethylene and butadiene monomer under the action of a catalyst.
Ultrahigh-molecular-weight polyethylene (UHMWPE) has been the material of choice for the polymeric component in total joint replacements primarily because of its excellent combination of wear resistance, structural strength and biocompatibility and remains the gold standard thus far. Nevertheless, wear of UHMWPE prostheses produces billions of submicron particles annually,1 which may cause a foreign-body response, leading to extensive bone resorption and gross loosening of the implants.2–5 UHMWPE wear is of particular concern for young or active patients who may face one or more revisions with accumulative bone loss in their lifetime. Thus, improving the wear resistance of UHMWPE and, thereby, reducing the volume of wear particles released to the periarticular tissues should reduce the adverse biological responses and substantially extend the clinical lifespan of total joint replacements.
Ultra-high molecular weight polyethylene is a polymer compound, which is difficult to process, and has excellent wear resistance, self-lubricating properties, high strength, stable chemical properties, and strong anti-aging properties. When it comes to ethylene, be sure to pay attention to these characteristics. The specific methods are as follows:
Due to its many excellent properties, UHMWPE has shown great advantages in the high performance fiber market, from mooring ropes in offshore oil fields to high performance lightweight composites, in modern warfare and aviation, Aerospace, marine defense equipment and other fields play a pivotal role.
Ultra high molecular weight polyethylene is superior in comprehensive performance, abrasion resistance, low temperature, corrosion resistance, self lubrication, impact resistance in all plastic for the highest value, wear-resistant properties than PTFE, nylon, carbon steel and other materials, can be long-term in-169 to +80℃ conditions, known as "amazing" engineering plastics, Ultra-high molecular weight polyethylene Engineering Plastics (UHMW---PE) pipeline technology is becoming more and more mature in China, more and more projects adopt this kind of pipeline, become a kind of new thermoplastic engineering plastics with good price, it almost concentrates the advantages of various plastics, wear-resisting impact, self-lubricating, corrosion resistance, low temperature, hygienic non-toxic, Non-adhesion, water and other comprehensive properties, is an ideal pipe, can be widely used in mining (ore powder, pulp, tailings discharge pipelines) metallurgy, electricity, petroleum, textile, papermaking, food, chemical, mechanical, electrical and other industries.
UHMWPE denotes Ultra High Molecular Weight Polyethylene which is a polyethylene polymer with an average molecular weight is greater than 3,100,000 as defined by ASTM D4020 – Standard specification for UHMWPE polymers. This molecular weight is well above the molecular weight of most typical polymers which are between 1,000,000 and 400,000 thus earning the title Ultra-High Molecular Weight Polyethylene. Polyethylenes with molecular weight in the 3.1 -4.5 Million range have been found to exhibit the best combination of impact strength and abrasion resistance.
For Polyethylene molecular weight classification the following guidelines can be used:
UHMWPE by virtue of its extremely high molecular weight yields several unique properties, including the highest abrasion resistance and highest impact strength of any plastic.
Ultra-high molecular weight polyethylene pipe (UHMWPE) wear-resistant plastic crown, is carbon steel, stainless steel 3-7 times.
Low friction coefficient, self-lubricating, anti-adhesion, no scaling, reduce the energy transmission of materials. Top of the plastic in the impact strength column. The impact energy absorption value is highest in all plastics and has a silencing nature. Good chemical stability. Excellent low-temperature resistance. Sanitation is non-toxic to food and drugs.
Ultrahigh molecular weight polyethylene (UHMWPE) shows unusually high wear resistance compared to most materials. This is due to a combination of very high molecular weight and the resulting entanglements and relative surface softness with a slippery waxy surface.
Compare with existing plastic pipes, Wear resistant UNMWPE pipe has the most excellent wear resistance which is 4 to 7 times that of Q235 steel pipe and 2.7 times that of wear-resistant steel 16Mn. Therefore it increases pipe flow rate and improves the transmission efficiency of more than 20%. The working life of UHMWPE pipes is more than 3 times that of wear-resistant steel pipe.
UHMWPE pipes are widely used in the industries of dredging, mining, metallurgy, electric power, oil, textile, paper, food, chemical, mechanics, gas, tunneling ect.
Mining tailings pipe is the tailings slurry discharged from non-ferrous metal ore beneficiation and ferrous metal ore beneficiation, which needs to be transported to the tailings inventory.
UHMWPE has the following impressive statistics: up to 15 times the abrasion resistance of steel while being 8 times lighter than steel and having 5 times lower coefficient of friction than steel and offering as low as 1/10 the pressure loss of steel pipes.
Because UHMWPE Pipe has a high molecular weight, it has good comprehensive properties and has become a new type of thermoplastic engineering plastic with excellent performance. It has almost the advantages of various plastics and has unparalleled wear resistance and resistance to ordinary polyethylene and other engineering plastics. Impact, self-lubrication, corrosion resistance, low-temperature resistance, hygienic non-toxic, non-adhesion, non-water absorption and other comprehensive properties. It has unique advantages in the transportation of solid particles, powder, slurry and gas.
At present, ultra-high molecular weight polyethylene pipes have achieved industrial continuous production in China. However, due to the characteristics of the UHMWPE raw materials, it is difficult to process UHMWPE pipes. Although the production of UHMWPE pipes has realized continuous extrusion production by a plastic extruder, its production speed is only ordinary plastics. The pipe production speed is 1%, so increasing the production rate of ultra-high molecular weight polyethylene pipes and improving the wear resistance index has become the focus of industry research.
Because the ultra-high molecular weight polyethylene pipe has excellent characteristics such as friction resistance, corrosion resistance, impact resistance, self-lubrication, non-adhesion, non-absorption of water, etc., it is recognized by the market, so the application range of ultra-high molecular weight polyethylene pipe is expanding.
The unique properties of the UHMWPE pipe material determine the slow speed of the pipe production line. The main equipment is the extruder and the mold.
As a Polyethylene UHMWPE Sheet Manufacturer, share with you the characteristics of UHMW-PE pipe products.
Ultra-high molecular weight polyethylene pipe refers to the pipe that is formed by using ultra-high molecular weight polyethylene as the main raw material. Its main characteristics are shown in the following points:
China's water supply and drainage pipelines mainly use PCCP pipes, cast iron pipes, and glass steel pipes. They are connected by sockets, sealed by rubber rings, and have serious leakage in the pipe network. The average leakage rate is about 15-30%, which wastes resources and increases pipe maintenance costs. The ultra-high molecular weight polyethylene pipe successfully solved this problem with excellent performance and brought major changes to the water supply and drainage engineering.
The ultra-high molecular weight polyethylene pipe has a roughness of 0.0065, the steel pipe has a roughness of 0.012, and the cement pipe has a roughness of 0.013. The water flow rate of ultra-high molecular weight polyethylene pipes of the same caliber is greater than that of PCCP pipes and cast-iron pipes. At the same flow rate, UHMWPE pipes can save energy by 25%.
Ultra-high molecular weight polyethylene pipe has a series of characteristics such as corrosion resistance, low-temperature resistance, non-scaling, and no leakage. Therefore, the pipe does not need to be rust-proof, decontaminated and overhauled for decades after operation, which can save more than 95% of operating and maintenance costs.