Hydrosilylation Crosslinking of Polyolefin Cable Insulation
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Solution Overview
Problem
Conventional crosslinking methods for polyolefin resins, such as peroxide and moisture curing, require specialized equipment and generate byproducts, increasing costs and complexity in producing cable insulation and jacket layers.
Innovation Solution
A hydrosilylation process using a polyolefin resin with diene groups and a silyl hydride crosslinking agent, catalyzed by suitable metals, to form crosslinked polyolefin compositions with improved mechanical and electrical properties without the need for continuous vulcanization tubes or additional degassing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If peroxide crosslinking is used to improve thermal characteristics and mechanical properties, then crosslinking efficiency is improved, but capital investment and operational costs increase due to required CV tube equipment
Solution Approach 1:
The patent extracts the crosslinking function from the complex CV tube equipment by using silane grafted copolymers that can crosslink through moisture exposure. This removes the dependency on specialized high-voltage equipment while maintaining crosslinking effectiveness for cable insulation and jacket layers.
Solution Approach 2:
The patent introduces moisture as an intermediary agent to trigger crosslinking, replacing the need for direct electrical discharge equipment. The silane grafted copolymer acts as a mediator that reacts with moisture to form crosslinks, simplifying the overall process equipment requirements.
2Strength
If peroxide crosslinking is used to achieve desired mechanical properties, then crosslinking efficiency is improved, but byproducts are generated requiring secondary degassing operations
Solution Approach 1:
The patent converts the typically harmful byproducts of crosslinking into beneficial outcomes. The silane crosslinking system produces minimal harmful byproducts compared to peroxide methods, and any moisture-related byproducts can be managed through the extrusion process itself, eliminating the need for separate degassing operations.
3Device complexity
If moisture curing is used to avoid CV tube equipment, then device complexity is reduced, but substantial byproducts are generated requiring additional processing
Solution Approach 1:
The patent optimizes the moisture content and exposure parameters during extrusion to control the crosslinking reaction. By carefully managing these parameters, the system achieves effective crosslinking while minimizing byproduct generation, avoiding the need for additional processing steps.
4Device complexity
If moisture curing is used to simplify equipment requirements, then device complexity is reduced, but secondary processes are required to provide moisture across the cross section
Solution Approach 1:
The patent combines the moisture provision step with the extrusion process itself. The silane grafted copolymer is incorporated into the polymer composition during compounding, and moisture is introduced during extrusion, merging multiple operations into a single integrated process that improves productivity.
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 hydrosilylation process achieves desirable mechanical and electrical properties, including high tensile strength and insulation resistance, while reducing manufacturing costs and complexity by eliminating the need for specialized equipment and secondary processing steps.
Implementation Method 1
The improved method to crosslink polyolefin resins can include the use of a hydrosilylation reaction to crosslink a polyolefin resin with a silyl hydride crosslinking agent in the presence of a suitable catalyst
Implementation Method 2
The improved method to crosslink polyolefin resins can include the use of a hydrosilylation reaction to crosslink a polyolefin resin with a silyl hydride crosslinking agent in the presence of a suitable catalyst
Data Source
AI summary
A method of crosslinking a polyolefin resin with a silyl hydride crosslinking agent is disclosed. Crosslinkable compositions containing a polyolefin resin having about 0.9% to about 10% diene groups and a silyl hydride crosslinking agent are also disclosed.