Vehicle Communication Cable Sheath Resin Composition
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Solution Overview
Problem
The challenge is to develop a communication cable with high flexibility and excellent communication characteristics for vehicles, as existing cables face issues with plasticizer bleeding, which affects dielectric properties and communication speed, especially in high-temperature environments.
Innovation Solution
A communication cable with a sheath composed of a resin composition containing polyolefin and thermoplastic elastomer, with a tensile modulus of elasticity of 500 MPa or less, and a mass increase rate of less than 50% when immersed in diisononyl phthalate at 100°C for 72 hours, preventing plasticizer transfer and maintaining dielectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyvinyl chloride with plasticizer is used for the sheath to improve flexibility and flame retardancy, then the sheath becomes flexible and flame retardant, but the plasticizer bleeds and transfers to the sheath over time, decreasing dielectric properties and communication speed
Solution Approach 1:
The patent changes the chemical composition parameters of the sheath material from conventional polyvinyl chloride with plasticizer to a plasticizer-free resin composition containing polyolefin and thermoplastic elastomer. This parameter change eliminates the plasticizer bleeding issue while maintaining flexibility through the elastomer component, and improves flame retardancy through the inherent properties of the polyolefin resin.
Solution Approach 2:
The patent uses a composite resin composition combining polyolefin and thermoplastic elastomer in specific proportions (5-50 mass% elastomer). This composite material achieves both flexibility (from the elastomer) and flame retardancy (from the polyolefin) without requiring plasticizers, thereby preventing dielectric property degradation while maintaining ease of operation.
2Reliability
If the crystallinity of the resin composition is increased to prevent plasticizer transfer, then plasticizer transfer is reduced, but the resin composition becomes less flexible
Solution Approach 1:
The patent changes the material composition to eliminate plasticizer entirely, making crystallinity enhancement unnecessary for plasticizer transfer prevention. The flexibility is maintained through the thermoplastic elastomer component rather than relying on crystallinity control, thus resolving the contradiction between plasticizer transfer resistance and flexibility.
Solution Approach 2:
The patent extracts and removes the plasticizer component from the resin composition completely. By eliminating the plasticizer, the need to control crystallinity for preventing plasticizer transfer disappears, and flexibility is achieved through alternative means (thermoplastic elastomer) that do not conflict with dielectric properties.
3Ease of manufacture
If polyvinyl chloride is used for insulator and base material to achieve flame retardancy and low cost, then flame retardancy and cost-effectiveness are improved, but plasticizer bleeding occurs in high temperature environments, transferring to the sheath and decreasing communication speed
Solution Approach 1:
The patent changes the material composition parameters to use plasticizer-free polyolefin resin for the sheath, eliminating the plasticizer bleeding issue that occurs in high-temperature vehicle environments. This maintains cost-effectiveness and flame retardancy while preserving communication speed by preventing dielectric property degradation from plasticizer transfer.
Solution Approach 2:
The patent adopts a resin composition that inherently resists plasticizer transfer without requiring additional protective measures or frequent maintenance. The material provides long-term reliable performance in high-temperature environments, effectively replacing the need for plasticizer-containing materials that would require replacement or maintenance due to degradation.
Data Source
AI summary
A communication cable includes an insulated wire including a conductor and a covering layer covering the conductor, the covering layer being made of an insulator, and a sheath covering an outer circumferential surface of the insulated wire, the sheath including a resin composition containing a polyolefin and a thermoplastic elastomer. A tensile modulus of elasticity of the sheath is 500 MPa or less, and a mass increase rate of the sheath is less than 50% by mass when the sheath is immersed in a diisononyl phthalate at 100° C. for 72 hours.