Cross-linked Polyolefin Pipe Stabilizer System for Chlorinated Water
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Solution Overview
Problem
Conventional antioxidants in polyethylene pipes used for potable water applications are rapidly consumed by chlorinated water environments, leading to accelerated degradation, necessitating a new polymer matrix formulation to reduce antioxidant extraction and depletion.
Innovation Solution
Incorporating a primary stabilizer like thiodiethylene-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and a second stabilizer such as hindered amine light stabilizers or nanoparticles, like zinc oxide, into cross-linked polyolefin pipes to enhance long-term stability and resistance to oxidative degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants are used in polyethylene pipes for potable water applications, then initial oxidation resistance is provided, but the antioxidants are rapidly consumed through catalyzed oxidation by chlorinated water, leading to accelerated degradation
Solution Approach 1:
The patent changes the chemical parameters of the stabilizer system by introducing sulphur-containing hindered phenols with specific molecular structures (Irganox 1035, Anox 70) that have different reactivity characteristics toward chlorine compared to conventional antioxidants. This parameter change reduces the rate of catalyzed oxidation consumption while maintaining oxidation protection
Solution Approach 2:
The patent creates a composite stabilizer system combining multiple components: sulphur-containing hindered phenols as primary stabilizers, supplemented by other antioxidants and stabilizers. This composite approach provides synergistic protection where the combination of stabilizers offers superior long-term resistance to chlorinated water compared to single stabilizer systems
2Ease of operation
If polyethylene is used for plastic pipes in potable water systems, then flexibility and long term stability are achieved, but exposure to chlorinated water at elevated temperatures and pressures leads to increased failure rates through catalyzed oxidation
Solution Approach 1:
The sulphur-containing hindered phenol stabilizers act as intermediary substances that preferentially react with chlorine and free radicals generated by chlorinated water, protecting the polyethylene polymer chains from oxidation. The stabilizer molecules serve as sacrificial intermediaries that consume the harmful oxidative species before they can attack the polymer structure
Solution Approach 2:
The patent converts the harmful interaction between chlorine and polyethylene into a beneficial protective mechanism by introducing stabilizers that undergo controlled reaction with chlorine. The stabilizers absorb the harmful oxidative effect, transforming the potentially destructive chlorine-polyethylene reaction into a controlled stabilizer-chlorine reaction that protects the pipe material
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 combination of stabilizers significantly improves long-term stability and resistance to oxidative degradation in chlorinated water environments, extending the lifespan of polyethylene cross-linked pipes under elevated temperatures and pressures.
Implementation Method 1
long term stability including oxidation resistance to meet current codes and standards for potable water applications
Implementation Method 2
extensive exposure to chlorine, and/or any of its water-soluble derivatives, at elevated temperatures and pressures, eventually leads to increased failure rates for plastic piping systems through catalyzed oxidation
Implementation Method 3
This may logically be achieved by lowering the rate of diffusion and, consequently, extraction and depletion of said entities
Data Source
AI summary
A plastic pipe is made of a cross-linked poiyolefin to be utilized in, but not limited to, potabie water applications. Certain antioxidants and stabilizers are added to a process for producing the plastic pipe. The added antioxidants and stabilizers remain as key components in the final plastic pipes, providing superior long term stability and resistance to oxidative degradation, the latter being caused by but not limited to, chlorinated water environments, At least a primary stabilizer is used in the material.