Zinc Oxide Polyethylene Pipe Composition for Chlorinated Water
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Solution Overview
Problem
Polymer compositions used in applications exposed to chlorinated water experience significant reduction in service lifetime due to degradation, necessitating improved resistance to chlorinated water exposure.
Innovation Solution
Incorporation of zinc oxide (ZnO) as an additive in polymer compositions to prevent or retard degradation when exposed to chlorinated water, forming chlorinated water-stabilized polymer compositions (CWS-PC), which can be produced using various polymerization methods and formed into pipes with enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional polymer compositions are used in applications exposed to chlorinated water, then the articles can be manufactured with standard materials and processes, but the service lifetime is significantly reduced due to degradation
Solution Approach 1:
The patent applies preliminary action by incorporating zinc oxide additive into the polymer composition before the degradation process begins. The zinc oxide is pre-mixed with the polyethylene resin and other additives during the compounding stage, creating a stabilized polymer composition that is resistant to chlorinated water degradation from the outset. This prevents degradation before it can occur during service
Solution Approach 2:
The patent uses zinc oxide as an intermediary substance that mediates between the polymer matrix and the harmful chlorinated water environment. The zinc oxide particles are distributed throughout the polyethylene resin, acting as a protective barrier that intercepts and neutralizes the degradation effects of chlorine, thereby protecting the polymer structure
2Reliability
If zinc oxide additive is incorporated to improve resistance to chlorinated water, then service lifetime and structural integrity are significantly increased, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the zinc oxide additive with the existing polymer composition formulation by incorporating it during the standard extrusion and compounding process. The zinc oxide is mixed with the polyethylene resin and conventional additives in a single compounding step, integrating the protective function into the existing manufacturing workflow without requiring separate processing stages
Solution Approach 2:
The patent modifies the chemical composition parameter of the polymer by adding zinc oxide at specific concentrations (typically 0.1-5% by weight). This parameter change enhances the degradation resistance while maintaining compatibility with standard manufacturing processes, as the additive can be incorporated using conventional mixing and extrusion equipment
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 use of ZnO in CWS-PC significantly increases the time-to-failure and structural integrity of pipes exposed to chlorinated water, offering improved resistance to chlorine-induced brittle oxidative failure by reducing degradation, with a time-to-failure increase of at least 25% compared to similar pipes lacking the additive.
Implementation Method 1
The polymer composition comprises an additive to prevent, reduce, or retard degradation of the polymer resulting from exposure to chlorinated water
Data Source
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AI summary
A method comprising forming a polymeric composition by adding zinc oxide to a polymer wherein a pipe formed from the polymeric composition displays a time to failure as determined in accordance with ASTM F2263-07(E1) that is increased by greater than about 25% when compared to an otherwise similar pipe formed from a polymeric composition lacking zinc oxide. A pipe comprising polyethylene and greater than about 0.5 wt.% zinc oxide having a time to failure as determined in accordance with ASTM F2263-07(E1) that is at least about 25% greater than an otherwise similar pipe prepared in the absence of zinc oxide. A method comprising forming a composition comprising a polymer and zinc oxide into an article, and testing the structural integrity of the article when exposed to chlorinated water wherein the zinc oxide is present in an amount of from about 500 ppm to about 10000 ppm.