Crosslinked Polyethylene Resin Composition for Power Cable Insulation
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Solution Overview
Problem
Conventional crosslinked polyethylene resin compositions for power cable insulation have limitations in heat resistance and water tree inhibition, restricting power transmission capacity and requiring enhanced properties for improved long-term workability and aging resistance.
Innovation Solution
A crosslinked polyethylene resin composition comprising low-density polyethylene, a crosslinking agent, a crosslinking facilitator, a treeing inhibitor, and a specific antioxidant mixture, with a crosslinking degree of 80-90% and a water tree inhibition rate of 10.7-15, optimized for power cable electric insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional crosslinked polyethylene is used for power cable insulation, then the basic insulating properties are maintained, but the general allowance temperature is limited to 90°C which restricts power transmission capacity
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific antioxidant mixture (thiobisphenol-based antioxidant combined with thiobis[2-tert-butyl-5-methyl-4,1-phenylene] bis[3-(dodecylthio)propionate]) and optimizing the crosslinking degree to 80-90%, which fundamentally alters the thermal stability parameters of the material, enabling the general allowance temperature to exceed 90°C and thus increasing power transmission capacity
2Reliability
If conventional crosslinked polyethylene composition is used, then the manufacturing process is simple, but the long-term aging resistance is insufficient which reduces workability
Solution Approach 1:
The patent creates a composite antioxidant system by combining thiobisphenol-based antioxidant with thiobis[2-tert-butyl-5-methyl-4,1-phenylene] bis[3-(dodecylthio)propionate], forming a synergistic mixture that provides superior long-term aging resistance. This composite approach enhances reliability while the specific formulation maintains reasonable manufacturing complexity
3Reliability
If conventional crosslinked polyethylene is used, then the basic water tree inhibition is provided, but the water tree inhibition effects are insufficient compared to the need for enhanced cable longevity
Solution Approach 1:
The patent introduces a specific intermediary substance - the antioxidant mixture containing thiobis[2-tert-butyl-5-methyl-4,1-phenylene] bis[3-(dodecylthio)propionate] - which acts as a mediator to significantly enhance water tree inhibition effects. This intermediary component provides the needed improvement in reliability while maintaining ease of manufacture as it can be incorporated into the existing extrusion process
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 achieves excellent heat resistance, enhanced long-term workability, and superior water tree inhibition effects, comparable to or exceeding those of conventional crosslinked polyethylene, ensuring improved power transmission capacity and cable longevity.
Implementation Method 1
Crosslinked polyethylene which has excellent properties of polyethylene as an insulating material and in which a disadvantage of weakness to heat of polyethylene is modified has a three-dimensional network structure unlike linear polyethylene
Implementation Method 2
e) greater than 0.3 parts by weight and 5 parts by weight or less of an antioxidant, wherein e) the antioxidant is a mixture of 0.01 to 2 parts by weight of a thiobisphenol-based antioxidant and 0.01 to 5 parts by weight of thiobis[2-tert-butyl-5-methyl-4,1-phenylene] bis[3-(dodecylthio)propionate]
Implementation Method 3
d) 0 to 5 parts by weight of a treeing inhibitor
Data Source
Figure 1~2
AI summary
Disclosed is a crosslinked polyethylene resin composition. More particularly, disclosed is a crosslinked polyethylene resin composition comprising a) 100 parts by weight of low-density polyethylene (LDPE), b) 0.1 to 10 parts by weight of a crosslinking agent, c) 0.1 to 5 parts by weight of a crosslinking facilitator, d) 0 to 5 parts by weight of a treeing inhibitor, and e) greater than 0.3 parts by weight and 5 parts by weight or less of an antioxidant. According to the present disclosure, a crosslinked polyethylene resin composition having general allowance temperature due to excellent heat resistance characteristics, enhanced long-term workability due to superior long-term aging resistance, and water tree inhibition effects similar or better than those of conventional crosslinked polyethylene (XLPE)), and a power cable manufactured from the composition may be provided.