Polyethylene Pipe Composition Chlorinated Water Resistance
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Solution Overview
Problem
Polyethylene compositions used in water pipes face degradation from chlorinated water, leading to reduced lifespan and performance, despite existing antioxidant solutions, there is a need for improved additives to enhance resistance and longevity.
Innovation Solution
Incorporating specific antioxidants, compound (A) and compound (B), into the polyethylene composition, where compound (A) is a phenolic stabilizer like 1,3,5-Tri-methyl-2,4,6-tris-(3,5-di-tert. butyl-4-hydroxybenzyl)benzene and compound (B) is 2,5,7,8-Tetramethyl-2-(4′,8′,12′-trimethyltridecyl)chroman-6-ol, to increase the pipe's resistance to chlorinated water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants are used in polyethylene compositions, then the pipes can be manufactured and processed, but the pipes deteriorate when in permanent contact with chlorinated water
Solution Approach 1:
The patent changes the chemical parameters of the antioxidant system by selecting specific compounds with particular molecular structures and properties. Compound (A) has a phenolic structure with specific substituents, while compound (B) has a chroman structure with specific alkyl groups. These parameter changes in the antioxidant composition provide enhanced resistance to chlorinated water degradation compared to conventional antioxidants.
Solution Approach 2:
The patent creates a composite antioxidant system by combining two different types of antioxidants (compound (A) and compound (B))) with complementary mechanisms of action. This composite approach synergistically enhances the overall stabilization effect against chlorinated water, where compound (A) provides primary antioxidant protection and compound (B) provides secondary protection and regenerates compound (A).
2Reliability
If stabilizers and antioxidants are added to polyethylene, then degradation from oxidants, light and heat can be prevented, but the complexity of the composition increases
Solution Approach 1:
The patent extracts and focuses on only two essential antioxidant compounds needed for protection against chlorinated water, eliminating unnecessary additives. By selecting specifically compound (A) and compound (B) with no other stabilizers or modifiers, the composition maintains simplicity while achieving the required protection, avoiding the complexity of multi-component stabilization systems.
3Ease of manufacture
If polyethylene is used for water pipes, then the material can be manufactured and installed, but it deteriorates due to permanent contact with chlorinated water
Solution Approach 1:
The patent applies preliminary protection by incorporating antioxidants compound (A) and compound (B) into the polyethylene composition during manufacturing, before the pipes are installed and exposed to chlorinated water. This preliminary stabilization ensures the pipes are pre-protected against future degradation from chlorinated water contact.
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 of these antioxidants significantly increases the oxygen induction time of polyethylene pipes exposed to chlorinated water, demonstrating enhanced thermal stability and extended lifespan.
Implementation Method 1
polymeric compounds are prone to aging under the effects of oxidants, light and heat
Data Source
AI summary
The present invention is directed to the use of compound (A) and compound (B) in a polyethylene composition for increasing the lifetime of a pipe made of said polyethylene composition which 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 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 R1, R2, R3, R4 and R5 independently are H, or non-substituted or substituted aliphatic or aromatic hydrocarbyl radicals which may comprise heteroatoms, and wherein the base resin of said polyethylene composition consists of a polyethylene homo- or copolymer.