Cross-linked polyethylene uses high-density polyethylene as the main raw material. Through the action of high-energy rays or chemical initiators, the linear macromolecular structure is transformed into a spatial network structure. Cross-linking can significantly improve the performance of polyethylene pipes.
Cross-linked polyethylene pipe from a professional cross linked polyethylene supplier has excellent resistance to environmental stress cracking, heat resistance and thermal strength, heat aging resistance, creep resistance, high tear resistance, notch crack resistance, electrical insulation, flame retardant properties, barrier properties, gasoline resistance and aromatic hydrocarbon resistance, and overcome the sensitivity of ordinary polyethylene to fillers.
The Vicat softening point increased from 87°C to 94°C; after thermal aging at 120°C for 168 hours, the tensile strength retention rate was 98%, and the elongation retention rate was 81%, while the uncross-linked polyethylene was melted and could not be tested;
In the active environment for 1000 hours, only 20% of the samples were broken, while the uncross-linked polyethylene samples were all broken in only 4 hours; the dielectric strength was increased from 39kv/mm to 41kv/mm; the oxygen index was increased by 17.5% up to 28% (gel content ≥ 65%); the burst pressure of the pipe is significantly increased, higher than 4mpa at room temperature, and as high as 2mpa at 95 °C.
The creep/rupture test shows that the service life of ordinary high-density polyethylene (hdpe) pipe is only 30 hours at 80°C and 2mpa ring stress, while the service life of cross-linked polyethylene (hdpe) pipe can be as long as 50 years . The compactness of polyethylene increases with cross-linking, so that the barrier property of cross-linked polyethylene is higher, which is very beneficial to improve the sealing performance of its products.
Polyethylene cross-linking can be carried out by physical method and chemical method. The molecular structures obtained by the two methods are very similar, so there is little difference in performance.
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