Silane-Crosslinkable Polyolefin Stabilizer System
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Solution Overview
Problem
Current silane-crosslinkable polymer compositions used in insulation coatings for wires and cables lack improved heat-aging properties, despite advancements in the field, and there is a need for enhanced stability and performance.
Innovation Solution
A silane-crosslinkable polymeric composition comprising a polyolefin with hydrolyzable silane groups, an acidic silanol condensation catalyst, a phenolic antioxidant with no tertiary-alkyl-substituted aryl or phenolic groups, and an ester-functionalized thioether, which when combined and crosslinked, exhibit improved heat-aging properties and reduced additive sweatout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants are used in silane-crosslinkable polymer compositions, then basic oxidation protection is provided, but heat-aging properties and oxidative induction time remain insufficient
Solution Approach 1:
The patent combines phenolic antioxidants with ester-functionalized thioethers to create a composite antioxidant system. This composite approach leverages the synergistic effects between the two different antioxidant types, where the phenolic antioxidant provides primary oxidation protection and the ester-functionalized thioether enhances heat stability and prevents degradation at elevated temperatures, together achieving superior heat-aging properties and extended oxidative induction time
Solution Approach 2:
The patent modifies the chemical structure and properties of the antioxidant system by selecting specific phenolic antioxidants without tertiary-alkyl-substituted aryl or phenolic groups and combining them with ester-functionalized thioethers. This parameter change in the chemical composition and structure of the antioxidant system enables improved compatibility with the silane-crosslinkable polymer matrix and enhanced performance under heat-aging conditions
2Reliability
If silane-crosslinkable polymer compositions are used for insulation coatings, then wire and cable protection is achieved, but additive sweatout occurs during processing and storage
Solution Approach 1:
The ester-functionalized thioether acts as an intermediary substance that mediates between the phenolic antioxidant and the polymer matrix. It enhances the compatibility and stability of the antioxidant system within the silane-crosslinkable polymer composition, preventing additive migration and sweatout during processing and storage while maintaining effective oxidation protection
Solution Approach 2:
The composite antioxidant system of phenolic antioxidant and ester-functionalized thioether creates a more stable and compatible mixture within the polymer matrix. This composite approach reduces additive sweatout by improving the overall stability and compatibility of the antioxidant components with the silane-crosslinkable polymer composition
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 phenolic antioxidants and ester-functionalized thioethers in the silane-crosslinkable polymeric composition significantly enhances oxidative induction time and heat-aging performance, providing improved stability and reduced additive loss, leading to better performance and processing consistency.
Implementation Method 1
a phenolic antioxidant having no tertiary-alkyl-substituted aryl or phenolic groups; and an ester-functionalized thioether
Implementation Method 2
an acidic silanol condensation catalyst
Implementation Method 3
an acidic silanol condensation catalyst
Data Source
AI summary
Silane-crosslinkable polymeric compositions comprising a polyolefin having hydrolyzable silane groups, an acidic silanol condensation catalyst, a phenolic antioxidant, and an ester-functionalized thioether. Such crosslinkable polymeric compositions can be employed in various articles of manufacture, such as in the wire and cable industry.