Halogen-Free Flame-Retardant Resin Composition for Cables

Solution Overview

Problem

Conventional halogen-free flame-retardant resin compositions struggle to provide both good flame retardancy, low-temperature properties, and fuel resistance for insulating layers and cable sheaths, as increasing the amount of metal hydroxides used for flame retardancy leads to deterioration of elongation and low-temperature properties.

Innovation Solution

A halogen-free flame-retardant resin composition comprising a base polymer with an ethylene-vinyl acetate copolymer and a polyolefin polymer, where the polyolefin has a melting point of 85°C or higher, and a metal hydroxide content of 150-250 parts by mass per 100 parts of the base polymer, along with optional acid-modified polyolefin and additives, to achieve enhanced flame retardancy, fuel resistance, and low-temperature properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the amount of metal hydroxide is increased to improve flame retardancy, then flame retardancy is improved, but elongation properties and low-temperature properties deteriorate

Engineering Contradiction:

Improveflame retardancyVSAvoidelongation properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies parameter changes by precisely controlling the metal hydroxide content within 150-250 parts by mass per 100 parts of base polymer, and by selecting specific polymer compositions (ethylene-vinyl acetate copolymer with 60-80% vinyl acetate content, and polyolefin with melting point 85°C or higher). This optimized parameter combination achieves flame retardancy while preventing deterioration of elongation properties and low-temperature characteristics.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining metal hydroxide flame retardant with a specifically formulated base polymer consisting of ethylene-vinyl acetate copolymer and polyolefin. This composite structure allows the metal hydroxide to provide flame retardancy while the polymer matrix maintains mechanical properties and low-temperature flexibility, resolving the contradiction between flame safety and mechanical performance.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the amount of metal hydroxide is increased to improve flame retardancy, then flame retardancy is improved, but low-temperature properties deteriorate

Engineering Contradiction:

Improveflame retardancyVSAvoidlow-temperature properties

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent applies parameter changes by precisely controlling the metal hydroxide content within 150-250 parts by mass per 100 parts of base polymer, and by selecting specific polymer compositions (ethylene-vinyl acetate copolymer with 60-80% vinyl acetate content, and polyolefin with melting point 85°C or higher). This optimized parameter combination achieves flame retardancy while preventing deterioration of elongation properties and low-temperature characteristics.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining metal hydroxide flame retardant with a specifically formulated base polymer consisting of ethylene-vinyl acetate copolymer and polyolefin. This composite structure allows the metal hydroxide to provide flame retardancy while the polymer matrix maintains mechanical properties and low-temperature flexibility, resolving the contradiction between flame safety and mechanical performance.

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If halogen-free material is used to improve environmental compatibility, then environmental compatibility is improved, but flame retardancy is reduced

Engineering Contradiction:

Improveenvironmental compatibilityVSAvoidflame retardancy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies parameter changes by precisely controlling the metal hydroxide content within 150-250 parts by mass per 100 parts of base polymer, and by selecting specific polymer compositions (ethylene-vinyl acetate copolymer with 60-80% vinyl acetate content, and polyolefin with melting point 85°C or higher). This optimized parameter combination achieves flame retardancy while preventing deterioration of elongation properties and low-temperature characteristics.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining metal hydroxide flame retardant with a specifically formulated base polymer consisting of ethylene-vinyl acetate copolymer and polyolefin. This composite structure allows the metal hydroxide to provide flame retardancy while the polymer matrix maintains mechanical properties and low-temperature flexibility, resolving the contradiction between flame safety and mechanical performance.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3628703A1Halogen-free flame-retardant resin composition, insulated wire, and cable

Publication Date: 2020.04.01 PROTERIAL LTD

Figure 1
Figure 2
Figure 3

AI summary

A halogen-free flame-retardant resin composition includes a base polymer; and 150 parts by mass or more and 250 parts by mass or less of a metal hydroxide with respect to 100 parts by mass of the base polymer. The base polymer includes (a) an ethylene-vinyl acetate copolymer having a vinyl acetate content of 60% by mass or more; and (b) a polyolefin polymer having a melting point of 85°C or higher. A ratio of a total mass of (a) and (b) with respect to a whole mass of the base polymer is 80% by mass or more.