Halogen-Free Flame Retardant Polyester Resin Composition

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Solution Overview

Problem

Current thermoplastic polyester resin compositions that impart flame retardancy often require halogen-containing compounds, which release toxic gases and corrode molds, or use excessive amounts of flame retardants, leading to increased production costs and compromised mechanical properties.

Innovation Solution

A thermoplastic polyester resin composition combining a polyester base resin with a cyclic oligomeric phosphazene compound, a melamine compound, an inorganic metal compound, a fluorinated polyolefin resin, and a filler, in specific weight ratios, to achieve flame retardancy without toxic halogen gas emission and maintaining mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If halogen-containing compounds are used as flame retardants, then flame retardancy is achieved, but toxic gases are released and molds are corroded

Engineering Contradiction:

Improveflame retardancyVSAvoidtoxic gas emission

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and eliminates halogen-containing compounds from the flame retardant system, replacing them with halogen-free alternatives (phosphoric acid esters and melamine cyanurate) to remove the source of toxic gas emission while maintaining flame retardancy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses a composite flame retardant system combining phosphoric acid esters and melamine cyanurate in specific ratios, creating a synergistic effect that achieves effective flame retardancy without halogen-containing compounds, thus preventing toxic gas release

Inventive Principle:

Principle #40Composite materials

2Reliability

If a large amount of flame retardant is added to achieve sufficient flame retardancy, then flame retardancy is improved, but production costs increase and mechanical properties deteriorate

Engineering Contradiction:

Improveflame retardancyVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The invention optimizes the concentration parameters of flame retardant additives, using phosphoric acid esters at 1-60 parts by weight and melamine cyanurate at 1-50 parts by weight based on 100 parts by weight of polybutylene terephthalate, achieving effective flame retardancy while minimizing impact on mechanical properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite flame retardant system where phosphoric acid esters and melamine cyanurate work synergistically, allowing effective flame retardancy at optimized concentrations that preserve mechanical properties better than using either additive alone at higher doses

Inventive Principle:

Principle #40Composite materials

3Reliability

If a large amount of flame retardant is added to achieve sufficient flame retardancy, then flame retardancy is improved, but moldability deteriorates

Engineering Contradiction:

Improveflame retardancyVSAvoidmoldability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention optimizes the concentration parameters of flame retardant additives to 1-60 parts by weight for phosphoric acid esters and 1-50 parts by weight for melamine cyanurate based on 100 parts by weight of polybutylene terephthalate, achieving effective flame retardancy while maintaining good moldability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite flame retardant system of phosphoric acid esters and melamine cyanurate provides synergistic flame retardancy at optimized concentrations, improving moldability compared to using single additives at higher doses

Inventive Principle:

Principle #40Composite materials

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 composition provides effective flame retardancy while preventing the release of toxic halogen gases and maintaining mechanical properties, offering a cost-effective solution for applications requiring high stability during fires.

Implementation Method 1

The present inventors have developed a thermoplastic polyester resin composition having good flame retardancy without deterioration of mechanical properties and which does not generate toxic halogen gas. The invention uses an oligomeric phosphazene compound, a melamine compound, an inorganic metal compound, a fluorinated polyolefin resin and a filler with a polyester base resin in a specific ratio.

Methodology Applied

Scientific EffectFlame retardancy:

Implementation Method 2

The invention uses an oligomeric phosphazene compound, a melamine compound, an inorganic metal compound, a fluorinated polyolefin resin and a filler with a polyester base resin in a specific ratio.

Methodology Applied

Scientific EffectFluorination:

Data Source

PatentUS7851532B2Flame retardant thermoplastic polyester resin composition

Publication Date: 2010.12.14 LOTTE ADVANCED MATERIALS CO LTD

AI summary

Disclosed herein is a flame retardant thermoplastic polyester resin composition comprising: (A) about 100 parts by weight of a polyester resin; (B) about 1 to about 60 parts by weight of a cyclic oligomeric phosphazene compound; (C) about 1 to about 50 parts by weight of a melamine compound; (D) about 1 to about 20 parts by weight of a inorganic metal compound; and (E) about 0.1 to about 5 parts by weight of a fluorinated polyolefin resin. The thermoplastic polyester resin composition may further contain a filler (F).