Polyethylene Pipe Composite for Light-Induced Degradation Resistance

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Solution Overview

Problem

Existing polyethylene pipes lack effective stabilization against light-induced degradation, leading to reduced durability and performance over time.

Innovation Solution

Incorporation of a hindered amine light stabilizer with a triazine residue and natural or synthetic hydrotalcite in specific weight ratios within the polyethylene composition to enhance light stability and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If polyethylene pipe is used without effective light stabilizers, then manufacturing cost is low and processing is simple, but the pipe deteriorates under light exposure leading to reduced durability

Engineering Contradiction:

Improvelight stabilityVSAvoidcomposition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies composite materials by combining polyethylene with specific light stabilizers (hindered amine compounds containing triazine residues) and hydrotalcite in defined weight ratios. This composite formulation provides synergistic protection against light-induced degradation while maintaining processability. The combination of stabilizer components creates a multi-functional system that addresses both UV absorption and radical scavenging mechanisms.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes parameter changes by optimizing the weight ratio of stabilizer component A) to hydrotalcite component B) within the range of 1:10 to 10:1, with a preferred range of 1:5 to 5:1. This parameter optimization ensures effective light stability while controlling manufacturing complexity and cost.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If higher concentrations of light stabilizers are used, then light stability improves, but manufacturing cost increases

Engineering Contradiction:

Improveresistance to light-induced degradationVSAvoidamount of stabilizer required

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent employs composite materials with synergistic effects, where hindered amine light stabilizers containing triazine residues work in conjunction with hydrotalcite. This composite approach provides enhanced light stability at lower individual concentrations compared to using single stabilizers, thereby reducing the total quantity of additives required while maintaining effectiveness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent uses hydrotalcite as an intermediary substance that enhances the effectiveness of the hindered amine light stabilizer. The hydrotalcite acts as a mediator that improves the stabilizer's performance against light-induced degradation, allowing for reduced stabilizer loading while maintaining protection levels.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Duration of action of stationary object

If conventional light stabilizers are used, then manufacturing is straightforward, but the pipe lacks sufficient durability under extended light exposure

Engineering Contradiction:

Improveservice life under light exposureVSAvoidprocessing simplicity

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent applies composite materials comprising polyethylene, hindered amine light stabilizers with triazine residues, and hydrotalcite in optimized ratios. This composite formulation provides superior durability under extended light exposure while maintaining ease of manufacture through standard extrusion processes. The synergistic interaction between components ensures long service life without complicating manufacturing.

Inventive Principle:

Principle #40Composite materials

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 polyethylene pipe's resistance to light-induced degradation, maintaining its structural integrity and performance over extended periods.

Implementation Method 1

component A) is a hindered amine light stabilizer containing a triazine residue

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

improves the polyethylene pipe's resistance to light-induced degradation

Methodology Applied

Scientific EffectPhoto-oxidation prevention: Photo-oxidation

Implementation Method 3

component B) is a natural or synthetic hydrotalcite

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Implementation Method 4

maintaining its structural integrity and performance

Methodology Applied

Scientific EffectPhysical barrier protection: Physical Containment

Data Source

PatentUS12421379B2Polyethylene pipe

Publication Date: 2025.09.23 BASF SE

AI summary

A polyethylene pipe comprising components A) and B), wherein component A) is a hindered amine light stabilizer containing a triazine residue, component B) is a natural or synthetic hydrotalcite and the weight ratio of component A) to component B) is 1:10 to 10:1.