Crosslinked Polyethylene Pipe Balancing Durability and Pressure Resistance
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Solution Overview
Problem
Crosslinked polyethylene pipes face a trade-off between long-term durability and short-term pressure resistance due to the mutual relationship between the degree of crosslinking and storage modulus, necessitating a balance to optimize both properties.
Innovation Solution
A crosslinked polyethylene pipe is developed with a storage modulus of 100 to 115 MPa at 95°C and a degree of crosslinking of 80 to 90%, achieved by optimizing the molecular structure through specific ultra-high molecular weight content and molecular weight distribution, allowing for improved long-term durability and short-term pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the degree of crosslinking is increased to improve long-term durability, then the storage modulus increases, but short-term pressure resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the degree of crosslinking within 60-90% and storage modulus within 80-120 MPa. This optimization of crosslinking parameters resolves the contradiction by finding the optimal range where both long-term durability and short-term pressure resistance are maximized, rather than simply increasing crosslinking degree indefinitely.
Solution Approach 2:
The patent employs composite materials by combining crosslinked polyethylene with specific additives and modifiers during the crosslinking process. This creates a composite structure that maintains flexibility and pressure resistance while achieving the desired degree of crosslinking for long-term durability.
2Strength
If the storage modulus is increased to improve short-term pressure resistance, then the degree of crosslinking increases, but long-term durability deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing an optimized parameter range where storage modulus is controlled at 80-120 MPa and degree of crosslinking at 60-90%. This balanced parameter optimization ensures that short-term pressure resistance is sufficient while preventing excessive crosslinking that would harm long-term durability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optimized pipe achieves excellent long-term durability and short-term pressure resistance, suitable for various applications by finding a balance in the degree of crosslinking and storage modulus, outperforming conventional pipes in both characteristics.
Implementation Method 1
Crosslinked polyethylene was developed by an electric wire company in 1960 to improve the temperature characteristics by heat generation of an electric wire, and German Thomas Engel has produced a pipe having excellent durability using this polyethylene in 1967. The crosslinked polyethylene is one that is modified into polyethylene having a three-dimensional network structure by crosslinking high density polyethylene (HDPE) having a linear molecular structure
Implementation Method 2
which satisfies: a storage modulus (E′) at 95° C. of 100 to 115 MPa when the dynamic viscoelasticity is measured under the conditions of vibrational frequency of 1 Hz and strain of 0.1%
Data Source
AI summary
The present disclosure relates to a crosslinked polyethylene pipe having excellent physical properties. The crosslinked polyethylene pipe according to the present disclosure has optimized the degree of crosslinking and storage modulus by finding out the optimum physical property range between the degree of crosslinking and the storage modulus which have a mutual trade-off relationship, whereby the crosslinked polyethylene pipe according to the present disclosure has excellent long-term durability and short-term pressure resistance, and thus can be applied to various fields requiring these physical properties.