Polyolefin Pipe and Cable Stabilization Against Oxidative Degradation
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Solution Overview
Problem
Polyethylene and polypropylene articles are susceptible to oxidative, thermal, and light-induced degradation, particularly when exposed to oxidizing media such as chlorinated water, leading to reduced durability and performance.
Innovation Solution
Incorporating a hindered amine light stabilizer with a triazine residue and magnesium hydroxide, in specific weight ratios, into polyethylene or polypropylene articles to enhance their resistance to degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene or polypropylene articles are used in environments with oxidizing media, then they provide basic protective functions, but they suffer from oxidative, thermal, and light-induced degradation leading to reduced durability
Solution Approach 1:
The patent applies composite materials by combining polyethylene or polypropylene with a specific mixture of stabilizers including hindered amine light stabilizers containing triazine residues and magnesium hydroxide. This composite stabilizer system provides synergistic protection against oxidative, thermal, and light-induced degradation, significantly improving the reliability and durability of the polymer articles when exposed to oxidizing media such as chlorinated water.
2Reliability
If conventional stabilizers are used alone, then they provide limited protection, but they cannot prevent multi-factor degradation effectively
Solution Approach 1:
The patent merges multiple stabilizing functions into a unified stabilizer system that combines hindered amine light stabilizers with triazine residues and magnesium hydroxide. This combination creates a synergistic effect where the components work together to provide comprehensive protection against oxidative, thermal, and photo-degradation, achieving enhanced stability without requiring separate complex stabilization systems for each degradation mechanism.
Solution Approach 2:
The stabilizer system described in the patent exhibits multi-functionality by providing simultaneous protection against multiple degradation mechanisms. The hindered amine light stabilizer with triazine residue and magnesium hydroxide combination serves as a universal stabilizing system that addresses oxidative degradation, thermal degradation, and light-induced degradation within a single formulation, making it applicable to various polymer articles facing multiple environmental stressors.
3Duration of action of stationary object
If no stabilizers are added, then the polymer remains simple and cost-effective, but it degrades rapidly when exposed to environmental factors
Solution Approach 1:
The patent applies parameter changes by optimizing the specific composition and ratios of stabilizers in the formulation. By carefully selecting the types of hindered amine light stabilizers with triazine residues and the amount of magnesium hydroxide, the patent achieves maximum protective effect with optimized stabilizer content. This allows extending the service life of polymer articles significantly while maintaining cost-effectiveness through precise control of stabilizer parameters rather than simply increasing stabilizer quantity.
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 significantly improves the oxidative induction time and stability of polyethylene and polypropylene articles, particularly in environments with oxidizing media, extending their service life and performance.
Implementation Method 1
component B) is magnesium hydroxide which is present in an amount of 0.01% to 5% by weight relative to the weight of the polyethylene or polypropylene
Implementation Method 2
component A) is a hindered amine light stabilizer containing a triazine residue
Implementation Method 3
component A) is a hindered amine light stabilizer containing a triazine residue
Data Source
AI summary
An article in the form of a pipe, cable or geomembrane comprising polyethylene or polypropylene, and components A) and B), wherein component A) is a hindered amine light stabilizer containing a triazine residue, component B) is magnesium hydroxide which is present in an amount of 0.01% to 5% by weight relative to the weight of the polyethylene or polypropylene, and the weight ratio of component A) to component B) is 1:50 to 50:1, with the proviso that component B) is not a hydrotalcite.