Geomembrane Liners Resisting Oxidative Degradation at 100 C
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Solution Overview
Problem
Conventional polyethylene geomembranes are limited to operating at temperatures below 60 °C due to accelerated oxidative degradation and creep, leading to reduced service life, with failures occurring through ductile, brittle-mechanical, and brittle-chemical mechanisms.
Innovation Solution
A geomembrane composition comprising a master batch with Linear Low Density Polyethylene (LLDPE), Medium Density Polyethylene (MDPE), High Density Polyethylene (HDPE), or Polyethylene of Raised Temperature (PERT) resin, combined with antioxidants, UV stabilizers, acid neutralizers, and carbon black, which provides enhanced thermal stability and mechanical properties, allowing operation up to 100 °C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polyethylene geomembranes are used, then they provide good mechanical properties and ease of manufacture, but they are limited to operating temperatures below 60°C due to accelerated oxidative degradation and creep
Solution Approach 1:
The patent modifies the chemical composition parameters of the geomembrane by incorporating specific antioxidants (Irganox 1010, Irganox 1330, BNX 1010, BNX 1330) and UV stabilizers (Chimassorb 119, Tinuvin 622, Tinuvin 292) in optimized concentrations. These parameter changes enable the geomembrane to maintain structural integrity and resist oxidative degradation at elevated temperatures up to 100°C, directly resolving the temperature-operating limit contradiction
Solution Approach 2:
The patent creates a composite material system by combining polyethylene base resin with multiple functional additives including primary and secondary antioxidants, UV stabilizers, and processing aids. This composite formulation synergistically enhances thermal stability and creep resistance while maintaining mechanical properties, allowing the geomembrane to operate reliably at temperatures significantly above the conventional 60°C limit
2Adaptability or versatility
If geomembranes operate at higher temperatures, then they can meet elevated temperature application requirements, but they experience accelerated creeping and additives depletion which shortens service life
Solution Approach 1:
The patent incorporates multiple antioxidants and stabilizers in advance before the geomembrane is exposed to high temperature service conditions. These additives act as a pre-established protective system that cushions against oxidative degradation and additive depletion during thermal aging, thereby extending service life while maintaining adaptability to elevated temperature applications
Solution Approach 2:
The patent uses sacrificial antioxidants and stabilizers that deplete over time during high-temperature service. These consumable additives preferentially react with degrading species, protecting the base polymer structure. Their controlled depletion extends the geomembrane's service life while allowing the material to adapt to elevated temperature conditions
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 solution extends the service life of geomembranes by resisting environmental stress cracking and maintaining mechanical integrity at elevated temperatures, with improved retention of oxidative induction time and high-pressure oxidative induction time after oven aging and UV exposure.
Implementation Method 1
resisting environmental stress cracking and maintaining mechanical integrity at elevated temperatures, with improved retention of oxidative induction time and high-pressure oxidative induction time after oven aging and UV exposure
Implementation Method 2
about 1200 to about 1500 ppm of said UV stabilizer
Implementation Method 3
about 20,000 to about 25,000 ppm of said carbon black
Implementation Method 4
Stage 2, 'brittle-mechanical failure,' occurs due to creeping and depletion of additives
Data Source
Figure 1
AI summary
Geomembrane liners suitable for use at elevated temperatures up to 100 °C, as we!l as master batch compositions suitable for preparing such geomembrane liners.