Chlorine-Resistant Crosslinkable Polyolefin Compositions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Crosslinkable silane-containing polyolefin compositions degrade when exposed to chlorine and other oxidants, commonly used in potable water systems, leading to embrittlement and cracking, which limits their long-term use and durability.
Innovation Solution
Incorporating a mixture of antioxidants, light absorbers, and stabilizers into the polyolefin compositions, along with a curing catalyst, to create a chlorine-resistant crosslinkable silane-containing polyolefin composition, which includes a sterically hindered phenol antioxidant, phosphite processing stabilizer, sterically hindered amine light stabilizer, and substituted benzotriazol ultraviolet light absorber, and using a stabilizer masterbatch for uniform distribution of additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinkable silane-containing polyolefin compositions are used in potable water systems, then they provide good mechanical properties and processability, but they degrade when exposed to chlorine and oxidants, leading to embrittlement and cracking
Solution Approach 1:
The patent introduces antioxidants and stabilizers as intermediary substances that mediate between the polyolefin composition and chlorine oxidants. These additives act as sacrificial agents that react with chlorine first, preventing direct attack on the polymer chains. The specific intermediaries include hindered phenol antioxidants, phosphite stabilizers, and nickel chelates that form a protective chemical buffer system
Solution Approach 2:
The patent creates a composite material system by combining crosslinkable silane-containing polyolefin with multiple stabilizing components including antioxidants, light absorbers, and metal deactivators. This composite formulation provides synergistic protection where each component addresses different degradation mechanisms, resulting in a material that maintains both processability and long-term chlorine resistance
2Reliability
If antioxidants and stabilizers are added to protect against chlorine degradation, then resistance to oxidants improves, but the composition becomes more complex and processing difficulty increases
Solution Approach 1:
The patent employs multi-functional stabilizer packages where single additives perform multiple protective roles. For example, hindered phenol antioxidants provide both oxidation resistance and chlorine stability, while phosphite stabilizers simultaneously prevent thermal degradation and oxidant attack. This multi-functionality reduces the number of separate components needed
Solution Approach 2:
The patent optimizes the concentration parameters of stabilizers to achieve effective protection at minimal levels. By carefully controlling the amounts of antioxidants and stabilizers within specific ranges, the composition achieves maximum chlorine resistance while minimizing processing complexity and cost
3Reliability
If uniform distribution of stabilizers is achieved using masterbatch, then degradation resistance improves, but manufacturing process steps increase
Solution Approach 1:
The patent applies preliminary action by pre-dispersing stabilizers and antioxidants into a masterbatch carrier resin before compounding with the polyolefin. This pre-concentration and pre-dispersion step ensures uniform distribution of protective additives throughout the final composition, eliminating the need for multiple separate addition steps during processing
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 resulting compositions exhibit enhanced resistance to chlorine, improved heat endurance, thermal aging resistance, and reduced yellowing, extending the lifespan of articles made from these materials, such as pipes and valves, while maintaining performance in the presence of oxidants and light.
Implementation Method 1
The crosslinkable silane-containing compositions are cured upon exposure to liquid water or atmospheric moisture
Implementation Method 2
cured upon exposure to liquid water or atmospheric moisture in the presence of a curing catalyst
Implementation Method 3
These crosslinkable silane-containing compositions contain a mixture of antioxidants, light absorbers and stabilizers that provide resistance to the levels of chlorine used in potable water
Implementation Method 4
a substituted benzotriazol ultraviolet light absorber
Data Source
AI summary
The present invention relates to chlorine resistant crosslinkable silane-containing polyolefin compositions and stabilizer masterbatch compositions, their preparation, and articles made therefrom. These crosslinkable silane-containing compositions contain a mixture of antioxidants, light absorbers and stabilizers that provide resistance to the levels of chlorine used in potable water and to light, thereby extending the useful life of said articles made therefrom, such as potable water pipes and valves, bottles, tanks, and the like.