PVC Wire Coating Composition with Ethylene Copolymer for Damage Resistance
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Solution Overview
Problem
Conventional electric wire coating materials with polyvinyl chloride face a trade-off between flexibility and damage resistance, where increasing plasticizer content enhances flexibility but reduces damage resistance, and reducing plasticizer content improves damage resistance but compromises low-temperature characteristics and tear resistance, especially in thin or small-diameter wires.
Innovation Solution
A composition for electric wire coating materials containing polyvinyl chloride with a specific range of plasticizer (15-30 parts by mass) and ethylene-based copolymers (0.1-10 parts by mass), including ethylene-vinyl ester and ethylene-α,β-unsaturated carboxylic acid ester copolymers, along with a filler like calcium carbonate (2-25 parts by mass), which enhances damage resistance, low-temperature flexibility, tear resistance, and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the amount of plasticizer is increased, then flexibility is improved, but damage resistance deteriorates
Solution Approach 1:
The invention optimizes the plasticizer content within a specific range (15-30 parts by mass per 100 parts by mass of polyvinyl chloride) rather than using arbitrary amounts. This parameter optimization resolves the contradiction by finding the optimal balance point where flexibility is sufficient while damage resistance is maintained at acceptable levels.
Solution Approach 2:
The invention creates a composite material system combining polyvinyl chloride, plasticizer, and ethylene-based copolymer. This composite approach allows the material to simultaneously exhibit both flexibility (from plasticizer) and damage resistance (from the copolymer reinforcement), resolving the trade-off between these opposing properties.
2Strength
If the amount of plasticizer is reduced, then damage resistance is improved, but low-temperature characteristics deteriorate
Solution Approach 1:
The invention introduces ethylene-based copolymer as a complementary material that specifically addresses low-temperature flexibility. This copolymer component compensates for the reduced plasticizer content, maintaining low-temperature characteristics while allowing for higher damage resistance.
Solution Approach 2:
The invention specifies a controlled plasticizer range (15-30 parts by mass) rather than using minimal amounts. This parameter control ensures that low-temperature flexibility is maintained while still achieving improved damage resistance compared to conventional high-plasticizer formulations.
3Length of moving object
If the thickness of electric wire coating is reduced, then wire diameter is decreased, but tear resistance deteriorates
Solution Approach 1:
The invention uses ethylene-based copolymer as a reinforcing component in the coating material composite. This copolymer provides enhanced mechanical strength and tear resistance, allowing the coating to be applied in thinner layers while maintaining sufficient tear resistance for small-diameter wires.
Solution Approach 2:
The invention optimizes the composition parameters of the coating material (plasticizer at 15-30 parts, ethylene-based copolymer at 0.1-10 parts per 100 parts of polyvinyl chloride) to achieve the desired balance between coating thickness and tear resistance for reduced wire diameters.
Data Source
AI summary
A composition for an electric wire coating material that has excellent damage resistance, low-temperature flexibility, tear resistance, and thermal stability, and an insulated electric wire in which this composition is used. The composition for an electric wire coating material containing polyvinyl chloride contains a plasticizer in an amount of 15 to 30 parts by mass and one or more ethylene-based copolymers selected from ethylene-vinyl ester copolymers and ethylene-α,β-unsaturated carboxylic acid ester copolymers in an amount of 0.1 to 10 parts by mass, with respect to 100 parts by mass of the polyvinyl chloride. An insulated electric wire is obtained by coating an outer circumference of a conductor with an insulating coating layer, with this composition for an electric wire coating material used in an electric wire coating material.