XLPE Cable Insulation Formulation for Crosslinking and By-Product Control
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Solution Overview
Problem
The formulation design and optimization of crosslinked polyethylene (XLPE) insulating materials for high-voltage alternating-current cables is hindered by a lack of systematicity, leading to inefficient experimental processes, significant resource waste, and inconsistent performance due to the complex interactions between crosslinking agents and antioxidants, resulting in issues like over-crosslinking, by-product formation, and reduced mechanical and electrical properties.
Innovation Solution
A method involving sequential optimization of base resin, crosslinking agent, and antioxidant formulations through qualitative and quantitative evaluation indicators, including rheological properties, crosslinking kinetics, and electrical properties, to ensure precise and efficient formulation design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of crosslinking agent DCP is increased to meet performance indicators, then crosslinking performance and thermal resistance are improved, but mechanical properties deteriorate and by-product formation increases
Solution Approach 1:
The patent changes the chemical parameter by replacing DCP with an organic peroxide crosslinking agent that has different decomposition characteristics and lower by-product formation, thereby maintaining crosslinking performance while improving mechanical properties and reducing acetophenone and cumyl alcohol by-products
Solution Approach 2:
The patent uses a composite antioxidant system combining multiple antioxidants (such as Irganox 1010 and Irganox 1076) in specific ratios to achieve synergistic effects that protect mechanical properties during crosslinking while maintaining thermal resistance
2Reliability
If the content of crosslinking agent DCP is increased to ensure crosslinking performance, then thermal resistance is improved, but by-product formation increases and degassing process requirements become stricter
Solution Approach 1:
The patent changes the crosslinking agent type to organic peroxide with lower by-product formation, and optimizes the antioxidant content to 0.5-2.0 phr to scavenge by-products, thereby reducing acetophenone and cumyl alcohol while maintaining thermal resistance
Solution Approach 2:
The patent converts the harmful by-products into manageable substances by using antioxidants to scavenge them during processing, transforming the degradation issue into a controlled reaction that protects the material while maintaining thermal performance
3Manufacturing precision
If comprehensive experiments are conducted on multiple compositions of crosslinking agents and antioxidants to design formulation, then formulation optimization is achieved, but experimental workload and resource consumption increase significantly
Solution Approach 1:
The patent segments the formulation optimization into distinct stages: first determining base resin properties, then optimizing crosslinking agent content separately, and finally adjusting antioxidant content, thereby reducing the complexity of simultaneous multi-parameter optimization
Solution Approach 2:
The patent performs preliminary determination of base resin characteristics and crosslinking agent content before conducting antioxidant optimization experiments, thereby reducing the number of variables in subsequent experiments and improving experimental efficiency
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
This method enhances the success rate of formulation design by reducing experimental workload and resource waste, improving mechanical and electrical properties, and ensuring high-performance XLPE insulating materials for high-voltage cables.
Implementation Method 1
dicumyl peroxide (DCP) is typically used as the crosslinking agent, which initiates and completes the crosslinking reaction under heat
Implementation Method 2
the primary mechanism of antioxidants is to scavenge active free radicals in the polymer, while the thermal crosslinking reaction of XLPE can only be carried out under the action of highly active free radicals generated by DCP
Data Source
AI summary
A method includes: step 1: determining initial elements of the formulation, including types of a base resin, an antioxidant, and a crosslinking agent; step 2: testing a sample prepared by hot press molding the pure base resin, and obtaining an optimized base resin sequentially through qualitative evaluation indicator I and quantitative evaluation indicator I; step 3: preparing multiple groups of crosslinking agent/antioxidant/base resin blends, and obtaining an optimized crosslinking agent formulation sequentially through qualitative evaluation indicator II and quantitative evaluation indicator II; step 4: preparing multiple groups of crosslinking agent/antioxidant/base resin blends, and obtaining an optimized antioxidant formulation sequentially through qualitative evaluation indicator III and quantitative evaluation indicator III; and step 5: verifying through electrical properties, if parameter measurement results all meet requirements, the formulation of the material is considered as an optimized formulation, and if not, returning to test a next candidate to be tested.