Polyolefin Pipe Composition Chlorine Dioxide Resistance
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Solution Overview
Problem
Polyolefin compositions used in pipes face degradation from chlorine dioxide-containing water, and existing antioxidants do not provide sufficient resistance, while also allowing for excessive migration of additives and their decomposition products, particularly phenols, into the water, which is a concern for longer pipe lifetime and compliance with legal standards.
Innovation Solution
A polyolefin composition comprising a specific combination of antioxidants, including 2,5,7,8-Tetramethyl-2-(4′,8′,12′-trimethyltridecyl)chroman-6-ol and 1,3,5-Tri-methyl-2,4,6-tris-(3,5-di-tert. butyl-4-hydroxyphenyl)benzene, with concentrations of at least 1200 ppm, which enhances resistance to chlorine dioxide and minimizes the migration of phenolic decomposition products into water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If higher concentrations of antioxidants are added to improve degradation resistance, then lifetime is extended, but migration of additives into water increases
Solution Approach 1:
The patent optimizes the concentration parameters of antioxidants to a specific range (0.01-1.0 wt% for vitamin E, 0.01-0.5 wt% for BHT). This parameter optimization achieves sufficient degradation resistance while controlling migration, as the balanced formulation provides protective function without excessive additive release into water.
Solution Approach 2:
The patent applies different antioxidant components with distinct migration characteristics and protection mechanisms. Vitamin E provides bulk degradation resistance while BHT contributes to surface stability with lower migration tendency. This local quality differentiation allows the system to extend pipe lifetime while minimizing harmful migration into water.
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 composition demonstrates improved resistance to chlorine dioxide-containing water and significantly reduces the migration of additives and their decomposition products, especially phenols, into the water, thereby extending the pipe's lifetime and ensuring compliance with stricter legal requirements.
Implementation Method 1
polymeric compounds are prone to aging under the effects of oxidants, light and heat
Implementation Method 2
antioxidants and light stabilizers can prevent or at least reduce these effects
Implementation Method 3
antioxidants and light stabilizers can prevent or at least reduce these effects
Implementation Method 4
migration of the used additives and its decomposition products, especially phenols, out of the composition
Data Source
AI summary
The present invention relates to a polyolefin composition with good resistance to degradation caused by chlorine dioxide-containing water and at the same time showing low migration of the used additives and its decomposition products, especially phenols, out of the composition. The present invention is also directed to a pipe made of such a polyolefin composition. The present invention further relates to the use of the polyolefin composition for the production of a pipe and to the use of a combination of particular types of antioxidants for increasing the resistance of a polyolefin composition against degradation caused by contact with chlorine dioxide-containing water and for maintaining at the same time a low migration of the used additives and its decomposition products, especially phenols, out of the polyolefin composition.