Halogen-Free Flame-Retardant Resin Composition with Amide Bond Additive

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Solution Overview

Problem

Halogen-free flame-retardant resin compositions used in wires and cables often discolor due to antioxidants, especially when processed at high temperatures with large amounts of magnesium hydroxide, affecting the desired color and identification of cables.

Innovation Solution

A halogen-free flame-retardant resin composition is developed, comprising a polyolefin-based resin, phenolic antioxidant, metal hydroxide, and a pigment with an additive having an amide bond, which suppresses discoloration by stabilizing the phenolic antioxidant during processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a phenolic antioxidant is added to suppress deterioration during molding and use, then the resin composition maintains stability, but discoloration occurs especially at high processing temperatures with large amounts of magnesium hydroxide

Engineering Contradiction:

Improvestability during molding and useVSAvoiddiscoloration affecting light hue

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

A silane coupling agent is introduced as an intermediary substance between the phenolic antioxidant and magnesium hydroxide. The silane coupling agent coordinates with both the antioxidant and the metal hydroxide, preventing direct harmful interactions while maintaining the antioxidant's stability and light-color properties during high-temperature processing

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the chemical environment parameters by introducing a silane-based coordinating agent that modifies the local chemical environment around the phenolic antioxidant. This parameter change prevents oxidation and discoloration by creating a protective chemical environment that maintains the antioxidant's stability at high processing temperatures

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a large amount of magnesium hydroxide is added as flame retardant, then flame retardancy is improved, but the antioxidant is more likely to discolor

Engineering Contradiction:

Improveflame retardancyVSAvoiddiscoloration of antioxidant

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The silane coupling agent serves as a mediator between the magnesium hydroxide and phenolic antioxidant, allowing large amounts of flame retardant to be added while preventing the antioxidant from coming into direct contact with the metal hydroxide surface, thereby preventing discoloration

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The silane coupling agent creates a localized protective environment around the phenolic antioxidant molecules, providing different chemical properties in different regions of the resin composition. The local area around the antioxidant is protected from oxidation and discoloration while the bulk material maintains flame retardancy

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9598554B2Halogen-free flame-retardant resin composition, wire and cable

Publication Date: 2017.03.21 PROTERIAL LTD

AI summary

A halogen-free flame-retardant resin composition includes a polyolefin-based resin, a phenolic antioxidant, a metal hydroxide, a pigment comprising one of titanium dioxide, monoazo yellow, benzimidazolone yellow, isoindolinone yellow, quinacridone red and perylene red, and an additive including an amide bond. The additive having the amide bond is added in an amount of 0.01 to 2 parts by weight relative to 100 parts by weight of the polyolefin-based resin.