Insulated Wire Multilayer Structure for Flame Retardancy and DC Stability
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Solution Overview
Problem
Conventional insulated wires with flame-retardant layers containing metal hydroxides face challenges in maintaining high flame retardancy and DC stability while reducing diameter and cost, as they are prone to electrical breakdown due to water absorption and require expensive materials.
Innovation Solution
The implementation of a multilayer structure comprising a conductor, a flame-retardant inner layer with metal hydroxide, a water ingress prevention layer, and a flame-retardant outer layer, where the water ingress prevention layer is formed with a thin mineral, metal, or polymer film to prevent moisture absorption, allowing the flame-retardant inner layer to serve as both a flame-retardant and electrical insulating layer, thereby reducing the overall diameter and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the flame-retardant layer is reduced to decrease outer diameter, then the outer diameter is reduced, but flame retardancy cannot be maintained at high level
Solution Approach 1:
The patent uses composite materials by combining metal hydroxide (flame retardant) with specific polymer matrices (polyester resin, polyolefin) to create a flame-retardant layer that achieves high flame retardancy at reduced thickness. The composite structure allows the layer to maintain effective flame resistance with less material, thereby reducing outer diameter while preserving flame retardancy performance.
2Length of stationary object
If the thickness of the insulation layer is reduced to decrease outer diameter, then the outer diameter is reduced, but insulation reliability and DC stability decrease
Solution Approach 1:
The patent merges the functions of the flame-retardant layer and the insulation layer into a single integrated layer. This flame-retardant inner layer simultaneously provides flame resistance (through metal hydroxide content of 40-200 parts by weight) and electrical insulation (through base polymer matrix), eliminating the need for a separate insulation layer and reducing overall outer diameter while maintaining both flame retardancy and DC stability.
3Reliability
If a separate electrical insulating layer is provided to maintain insulation reliability, then DC stability is maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The flame-retardant inner layer is designed to perform multiple functions simultaneously: it provides flame retardancy (through metal hydroxide), electrical insulation (through base polymer), and serves as the inner structural layer. This multi-functional design eliminates the need for separate dedicated insulation and structural layers, reducing overall layer complexity while maintaining DC stability.
4Reliability
If expensive engineering plastics are used to maintain high DC stability with reduced diameter, then DC stability is maintained, but manufacturing cost increases
Solution Approach 1:
The patent changes the compositional parameters of the flame-retardant inner layer by optimizing the metal hydroxide content (40-200 parts by weight) and base polymer matrix, enabling the use of cost-effective polymer materials instead of expensive engineering plastics. This parameter optimization allows achieving high DC stability through compositional design rather than relying on costly materials, thereby reducing manufacturing cost while maintaining performance.
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 configuration enables insulated wires and cables to maintain high flame retardancy and DC stability with a reduced outer diameter and lower production costs, meeting stringent standards like EN 50305.6.7 and EN 60332-1-2, while avoiding the need for separate electrical insulating layers.
Implementation Method 1
Flame-retardant layers containing a large amount of metal hydroxide as a flame retardant are likely to electrically break down due to water absorption
Implementation Method 2
flame-retardant resin compositions containing a metal hydroxide such as magnesium hydroxide or aluminum hydroxide
Data Source
AI summary
An insulated wire includes a conductor, a flame-retardant inner layer that is provided around the conductor and includes a metal hydroxide, and a water ingress prevention layer provided around the flame-retardant inner layer. The insulated wire may further include a flame-retardant outer layer provided around the water ingress prevention layer.