Stabilized Polyolefin Pipes and Cables for Oxidative Resistance
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Solution Overview
Problem
Polyethylene and polypropylene articles used in pipes, cables, and geomembranes are susceptible to oxidative, thermal, and light-induced degradation, especially when exposed to oxidizing media such as chlorinated water.
Innovation Solution
Incorporating a combination of hindered amine light stabilizers containing a triazine residue and magnesium hydroxide into polyethylene or polypropylene formulations, with specific weight ratios and concentrations, to enhance stability and resistance to degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene or polypropylene articles are used in harsh environments (pipes, cables, geomembranes exposed to oxidizing media), then they provide functional performance, but they suffer from oxidative, thermal, and light-induced degradation
Solution Approach 1:
The patent applies composite materials by combining polyethylene or polypropylene with a specific mixture of stabilizers including hindered amine light stabilizers (HALS) containing triazine residues, magnesium hydroxide, and other antioxidants. This composite formulation creates a multi-functional stabilization system where different components work synergistically to protect against oxidative, thermal, and light-induced degradation simultaneously
Solution Approach 2:
The patent uses hindered amine light stabilizers containing triazine residues as intermediary substances that actively intervene in the degradation process. These HALS compounds act as mediators by scavenging free radicals and decomposing hydroperoxides, thereby preventing the propagation of oxidative chains that would otherwise degrade the polymer
2Duration of action of moving object
If conventional stabilizer systems are used to protect polymer articles, then some protection is provided, but the oxidative induction time is insufficient for long-term durability in harsh environments
Solution Approach 1:
The patent merges multiple stabilizer functions into a single integrated system. It combines hindered amine light stabilizers with triazine residues, magnesium hydroxide, phenolic antioxidants, and phosphite antioxidants in specific weight ratios. This merging creates a synergistic effect where the cumulative oxidative induction time exceeds 1000 hours, far surpassing what any single stabilizer could achieve alone
Solution Approach 2:
The patent optimizes the parameters of the stabilizer system by precisely controlling the weight ratios of different components. The HALS with triazine residues is present at 0.01-5 wt%, magnesium hydroxide at 0.1-10 wt%, and other antioxidants at optimized levels. This parameter optimization ensures the cumulative oxidative induction time exceeds 1000 hours while maintaining processability and performance
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 proposed solution significantly increases the oxidative induction time (OIT) of the polymer articles, indicating improved resistance to oxidative degradation, thereby extending their service life and performance in harsh environments.
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.