Halogen-Free Polyester Wire Coating Resin Composition
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Solution Overview
Problem
Current wire coating materials, such as PVC and thermoplastic polyester resins, face challenges in achieving excellent extrudability, heat deterioration resistance, abrasion resistance, flame retardancy, and insulating properties while minimizing smoke production and avoiding halogen compounds.
Innovation Solution
A resin composition combining a thermoplastic polyester resin with a polyester block copolymer, a polycarbodiimide compound, magnesium hydroxide, an inorganic porous filler, and antioxidants, specifically optimized in terms of molecular weights, particle diameters, and composition ratios to enhance flexibility, heat stability, and insulating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVC resin is used as wire coating material, then insulating properties and cost are improved, but environmental pollution occurs due to chlorine gas generation during disposal
Solution Approach 1:
The invention extracts and removes the harmful chlorine element from the wire coating material system by completely eliminating PVC resin and replacing it with a halogen-free thermoplastic polyester resin-based composition, thereby retaining insulating properties while eliminating chlorine gas generation during disposal
Solution Approach 2:
The invention creates a composite material system consisting of thermoplastic polyester resin as the base, combined with polycarbodiimide compound for heat resistance, polyester block copolymer for flexibility, and inorganic fillers, forming a multi-component composite that achieves both environmental friendliness and required performance
2Object-generated harmful factors
If olefin-based material is used to reduce weight and thickness, then environmental friendliness is improved, but mechanical strength and abrasion resistance are insufficient
Solution Approach 1:
The invention creates a composite material system where thermoplastic polyester resin provides the base matrix, polycarbodiimide compound enhances heat resistance and stabilizes the polymer structure, polyester block copolymer contributes flexibility and toughness, and inorganic fillers provide reinforcement, collectively achieving both environmental friendliness and required mechanical strength
Solution Approach 2:
The invention changes the fundamental material parameter from olefin-based to thermoplastic polyester-based composition, fundamentally altering the material's mechanical properties, thermal stability, and environmental characteristics to simultaneously achieve strength, heat resistance, and environmental friendliness
3Temperature
If thermoplastic polyester resin is used, then heat resistance and abrasion resistance are improved, but heat deterioration resistance is insufficient
Solution Approach 1:
The invention introduces polycarbodiimide compound as an intermediary substance that reacts with the thermoplastic polyester resin to form a stabilized composite system, where the polycarbodiimide acts as a heat stabilizer and protective agent that prevents deterioration of the polyester resin under high temperature conditions
Solution Approach 2:
The invention changes the thermal stability parameter of the thermoplastic polyester resin by incorporating polycarbodiimide compound, which fundamentally alters the material's response to heat aging and prevents molecular degradation, thereby achieving excellent heat deterioration resistance while maintaining inherent heat resistance
4Temperature
If polycarbodiimide compound with low softening temperature is used to improve heat resistance, then heat resistance is improved, but productivity decreases due to adhesion to injection port
Solution Approach 1:
The invention changes the critical parameter of softening temperature of the polycarbodiimide compound from low to high (50°C or higher), which fundamentally alters the material's behavior during processing - the higher softening temperature prevents adhesion to injection ports while maintaining heat resistance benefits, thereby resolving the productivity issue
Data Source
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AI summary
A resin composition for wire coating, which is excellent in extrudability, heat deterioration resistance, abrasion resistance, flame retardancy and insulating properties, can achieve low smoke-producing properties and contains no halogen compound and an insulated wire obtained therefrom. The resin composition for wire coating comprises (A) a specific thermoplastic polyester resin (component A), (B) a polyester block copolymer (component B), (C) a polycarbodiimide compound (component C), (D) magnesium hydroxide (component D), (E) an inorganic porous filler (component E), (F) a hindered phenol-based antioxidant (component F) and (G) a phosphorus-based antioxidant (component G) in a specific ratio.