Polyolefin Pipe Composition Chlorinated Water Resistance
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Solution Overview
Problem
Polyolefin compositions used in water pipes face degradation when in contact with chlorinated water, leading to reduced lifetime due to oxidation, heat, and light exposure, despite existing antioxidant additives.
Innovation Solution
A polyolefin composition comprising specific antioxidants, such as compound (A) with a phenolic stabilizer and compound (B) as a phosphite, optimized in concentration and structure to prevent degradation, specifically 1,3,5-Tri-methyl-2,4,6-tris-(3,5-di-tert. butyl-4-hydroxyphenyl) benzene and bis(2,4-dicumylphenyl) pentaerythriol diphosphite, respectively, is used to enhance the resistance to chlorinated water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants are used in polyolefin compositions, then processing and general stability are improved, but resistance to chlorinated water deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the antioxidant system by selecting specific compounds: a phenolic antioxidant with particular structural features (compounds of formulae I and II) and a phosphite/phosphonite antioxidant (formula III). These specific parameter selections provide superior resistance to chlorinated water compared to conventional antioxidants, directly resolving the contradiction between general stability and chlorinated water resistance.
Solution Approach 2:
The patent employs a composite antioxidant system combining two different classes of antioxidants: phenolic antioxidants (formulae I and II) and phosphite/phosphonite antioxidants (formula III). This composite approach creates synergistic effects where the combination provides both processing stability and enhanced resistance to chlorinated water, resolving the contradiction between general reliability and specific environmental resistance.
2Ease of operation
If polyolefin pipes are exposed to chlorinated water, then water distribution function is maintained, but degradation and loss of mechanical properties occur
Solution Approach 1:
The patent applies preliminary protective action by incorporating specific antioxidants (phenolic compounds of formulae I and II, and phosphite/phosphonite of formula III) into the polyolefin composition before the pipe is exposed to chlorinated water. This pre-established defense system prevents oxidation and degradation from occurring, maintaining mechanical strength while enabling continuous water distribution function.
Solution Approach 2:
The antioxidants act as intermediary substances between the polyolefin pipe material and the chlorinated water. The specific phenolic and phosphite/phosphonite antioxidants intercept and neutralize the harmful effects of chlorine and oxygen before they can degrade the polyolefin chains, thereby preserving mechanical properties while allowing the pipe to perform its water distribution function.
3Reliability
If stabilizer combinations are selected for desired final properties, then end-use performance is improved, but complexity of additive selection increases
Solution Approach 1:
The patent simplifies the complex selection process by defining specific parameter ranges and structural features for the antioxidants. By specifying phenolic antioxidants with particular molecular structures (formulae I and II) and phosphite/phosphonite antioxidants (formula III), the patent provides clear selection criteria that ensure desired end-use properties without requiring complex trial-and-error additive selection.
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 significantly increases the lifetime of polyolefin pipes in contact with chlorinated water by maintaining mechanical and thermal properties, as demonstrated by improved hoop stress and failure time performance compared to comparative examples.
Implementation Method 1
polymeric compounds are prone to aging under the effects of oxidants, light and heat. This results in a loss of lifetime such as loss of strength, stiffness and flexibility
Data Source
AI summary
The present invention relates to the use of compound (A) and compound (B) in a polyolefin composition for increasing the lifetime of a pipe made of said polyolefin composition which pipe is in permanent contact with chlorinated water, wherein compound (A) has the following formula (I): wherein R6, R7 and R8 independently are non-substituted or substituted aliphatic or aromatic hydrocarbyl radicals which may comprise OH-groups, -X1, X2, and X3 independently are H or OH, with the proviso that at least one of X X1, X2, and X3 is OH, and - the entire molecule does not comprise an ester group, wherein compound (B) has the following formula (II): wherein R and R' each is the same or different residue and comprising at least 6 carbon atoms.