Non-Halogen Resin Composition for Insulated Wire
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Solution Overview
Problem
Conventional non-halogen resin compositions for insulated electrical wires face challenges in achieving a balance between flame retardancy, mechanical properties, and long-term heat resistance, often requiring high amounts of inorganic flame retardants that compromise abrasion resistance, flexibility, and heat resistance, and also suffer from plasticizer migration issues when used in wire harnesses with PVC resin compositions, leading to deteriorated heat resistance over time.
Innovation Solution
A non-halogen resin composition comprising 50-75 weight percent polypropylene, 20-40 weight percent propylene-alpha olefin copolymer, 5-10 weight percent low density polyethylene, 50-100 parts by weight metal hydroxide, 3-5 parts by weight phenolic anti-oxidant, and 0.5-2 parts by weight hydrazine-containing metal capture agent, which enhances mechanical properties and long-term heat resistance while preventing plasticizer migration from PVC resin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic flame retardant component is added in large amount to enhance flame retardant property, then flame retardant property is improved, but mechanical properties such as abrasion resistance, flexibility, and heat resistance performance deteriorate
Solution Approach 1:
The patent optimizes the composition parameters of the resin blend, specifically using 50-75 wt% polypropylene, 20-40 wt% propylene-alpha olefin copolymer, and 5-10 wt% low density polyethylene to achieve the desired balance between flame retardancy and mechanical properties without excessive inorganic additives
Solution Approach 2:
The patent creates a composite resin system combining multiple polymer types (polypropylene, propylene-alpha olefin copolymer, low density polyethylene) with metal hydroxide flame retardant to achieve synergistic effects that improve both flame retardant property and mechanical properties simultaneously
2Object-affected harmful factors
If non-halogen resin composition is used to avoid harmful halogen gas production, then environmental compatibility is improved, but long-term heat resistance deteriorates due to plasticizer migration from PCV composition
Solution Approach 1:
The patent incorporates metal capture agents and antioxidants into the non-halogen resin composition beforehand to prevent the degradation effects that would normally occur through plasticizer migration and oxidation, thus maintaining heat resistance over time
Solution Approach 2:
The patent uses metal capture agents as intermediaries to intercept and neutralize metal ions that would otherwise catalyze degradation reactions, preventing the loss of heat resistance when the non-halogen resin is used alongside PCV composition
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
The proposed resin composition achieves enhanced abrasion resistance, flame retardancy, flexibility, and long-term heat resistance without compromising mechanical properties, and maintains stability even when in contact with PVC resin compositions for extended periods, preventing heat resistance deterioration.
Implementation Method 1
3 to 5 parts by weight of a phenolic anti-oxidant
Implementation Method 2
50 to 100 parts by weight of a metal hydroxide
Implementation Method 3
0.5 to 2 parts by weight of a hydrazine-containing metal capture agent
Data Source
AI summary
The present invention provides a non-halogen resin composition, an insulated electrical wire formed of the non-halogen resin composition, and a wire harness including the insulated electrical wire. The non-halogen resin composition, comprising: (A) 100 parts by weight of a base resin, containing 50 to 75 weight percent of a polypropylene, 20 to 40 weight percent of a propylene-alpha olefin copolymer, and 5 to 10 weight percent of a low density polyethylene; (B) 50 to 100 parts by weight of a metal hydroxide; (C) 3 to 5 parts by weight of a phenolic anti-oxidant; and (D) 0.5 to 2 parts by weight of a hydrazine-containing metal capture agent. The non-halogen resin composition exhibits excellent mechanical properties such as abrasion resistance, flame retardant property, flexibility, and long-term heat resistance, even if it contains inorganic flame retardant therein.