Diallylamide Crosslinkable Polyethylene for Low-Byproduct Cable Insulation
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Solution Overview
Problem
Existing crosslinkable polymeric compositions for medium to extra-high voltage cables generate undesirable byproducts during crosslinking, which require vacuum removal, and there is a need for improved resistance to coagent migration and enhanced crosslinking properties.
Innovation Solution
A crosslinkable polymeric composition comprising an ethylene-based polymer, an organic peroxide, and a crosslinking coagent with at least one N,N-diallylamide functional group, specifically structures selected from formulas (I) or (II), which provides superior resistance to coagent migration and enhanced crosslinking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyallyl crosslinking coagents are used with organic peroxide, then crosslinking of polyethylene can be achieved, but undesirable byproducts are generated that require vacuum removal
Solution Approach 1:
The invention changes the chemical structure parameter of the crosslinking coagent from conventional polyallyl structures to N,N-diallylamide structures with specific formulas (I) or (II). This structural parameter change modifies the crosslinking reaction pathway to reduce harmful byproduct generation while maintaining effective crosslinking performance.
Solution Approach 2:
The invention creates a composite crosslinking system combining ethylene-based polymer, organic peroxide initiator, and N,N-diallylamide crosslinking coagent in specific proportions. This composite material approach optimizes the crosslinking reaction to achieve reliable crosslinking with reduced harmful byproducts compared to conventional single-component coagents.
2Reliability
If vacuum removal is used to eliminate byproducts, then crosslinking can proceed, but process complexity and time increase
Solution Approach 1:
The invention extracts and eliminates the need for vacuum removal systems by using N,N-diallylamide crosslinking coagents that do not generate significant harmful byproducts. The crosslinking reaction proceeds without requiring vacuum equipment, simplifying the overall process while maintaining crosslinking quality.
3Reliability
If conventional crosslinking coagents are used, then crosslinking can occur, but coagent migration resistance is insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the crosslinking coagent to N,N-diallylamide structures with specific molecular weights and formulations. These parameter changes enhance the coagent's stability and resistance to migration while preserving its crosslinking capability, addressing both requirements simultaneously.
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 composition exhibits reduced coagent migration and improved crosslinking performance, with the diallylamide coagent contributing to superior resistance to coagent migration and maintaining effective crosslinking properties, even at reduced organic peroxide levels, resulting in enhanced cable insulation.
Implementation Method 1
The radical reactions between peroxide and polyethylene generate undesirable byproducts which must be removed by vacuum after crosslinking the polyethylene.
Implementation Method 2
a crosslinking coagent having at least one N,N-diallylamide functional group wherein said crosslinking coagent has a structure selected from the group consisting of formulas (I) or (II)
Data Source
AI summary
The present invention relates to a crosslinkable polymeric composition, comprising: (a) an ethylene-based polymer; (b) an organic peroxide; and (c) a crosslinking coagent having at least one N,N-diallylamide functional group wherein said crosslinking coagent has a structure selected from the group consisting of formulas (II) or (III): and combinations thereof.