PVC Wire Coating Composition with Thermoplastic Polyurethane Elastomer
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Solution Overview
Problem
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 when the wire is bent or subjected to external damage.
Innovation Solution
A composition for electric wire coating materials containing 15 to 30 parts by mass of plasticizer and 0.01 to 10 parts by mass of thermoplastic polyurethane elastomer per 100 parts by mass of polyvinyl chloride, with a Shore hardness of A75 to A85, which includes a polyether chain in the elastomer and uses phthalic acid esters or similar plasticizers, balances damage resistance, low-temperature flexibility, and tear resistance.
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 patent uses a composite material system consisting of polyvinyl chloride as the base resin combined with specific amounts of plasticizer (15-30 parts by mass) and thermoplastic polyurethane elastomer (0.01-10 parts by mass). This composite approach allows the material to achieve both flexibility from the plasticizer and damage resistance from the elastomer reinforcement, resolving the contradiction between these two properties.
Solution Approach 2:
The patent optimizes the quantitative parameters of plasticizer content (15-30 parts by mass per 100 parts by mass of polyvinyl chloride) and elastomer content (0.01-10 parts by mass per 100 parts by mass of polyvinyl chloride) to achieve the desired balance between flexibility and damage resistance. By precisely controlling these parameter ranges, the material achieves optimal performance without excessive plasticizer content.
2Strength
If the amount of plasticizer is reduced, then damage resistance is improved, but low-temperature characteristics deteriorate
Solution Approach 1:
The patent employs a composite material system where polyvinyl chloride is combined with controlled amounts of plasticizer (15-30 parts by mass) and thermoplastic polyurethane elastomer (0.01-10 parts by mass). This composite structure maintains low-temperature flexibility through the plasticizer while achieving damage resistance through the elastomer reinforcement, preventing the deterioration of low-temperature characteristics.
Solution Approach 2:
The patent optimizes the plasticizer content parameter within the range of 15-30 parts by mass per 100 parts by mass of polyvinyl chloride to ensure sufficient low-temperature characteristics while maintaining damage resistance. This parameter optimization prevents the material from becoming too rigid at low temperatures.
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 patent uses a composite material formulation with polyvinyl chloride, plasticizer (15-30 parts by mass), and thermoplastic polyurethane elastomer (0.01-10 parts by mass) that enhances tear resistance through the elastomer component. This allows the coating to maintain sufficient tear resistance even when the coating thickness is reduced to decrease wire diameter.
Solution Approach 2:
The patent optimizes the composition parameters, particularly the elastomer content (0.01-10 parts by mass per 100 parts by mass of polyvinyl chloride), to compensate for reduced coating thickness. The optimized parameter combination ensures adequate tear resistance is maintained despite the thinner coating layer.
Data Source
AI summary
A composition for an electric wire coating material that has excellent damage resistance, low-temperature flexibility, and tear resistance, 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 a thermoplastic polyurethane elastomer in an amount of 0.01 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, using this composition for an electric wire coating material in an electric wire coating material.