Halogen-Free Flame Retardant Polyester Stabilization

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Solution Overview

Problem

Conventional halogen-free flame retardant polyester formulations lack good long-term heat stability, which is essential for engineering plastics requiring thermal resistance, mechanical strength, and moldability.

Innovation Solution

A polyester composition comprising structural units derived from diacids, diols, phosphorus-containing compounds, mineral-like stabilizers such as calcium hydroxyapatite, and organic compounds with functional groups like epoxy, carbodiimide, or orthoesters, which enhance thermal stability and mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If halogen-free flame retardant polyester formulations based on organic P-compounds are used, then flame retardancy is improved, but long term heat stability deteriorates

Engineering Contradiction:

Improveflame retardancyVSAvoidlong term heat stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent combines multiple stabilizer components (mineral-like stabilizers such as calcium hydroxyapatite, barium carbonate, or calcium sulfate together with organic stabilizers having specific functional groups) to create a composite stabilization system. This composite approach allows the formulation to achieve both flame retardancy through phosphorus compounds and long-term heat stability through the synergistic combination of mineral and organic stabilizers, resolving the contradiction between flame safety and thermal durability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent specifies precise compositional parameters for the stabilizer system, including the types of mineral-like stabilizers (calcium hydroxyapatite, barium carbonate, calcium sulfate, etc.), organic stabilizers with specific functional groups (carboxyl, hydroxyl, amino, epoxy, orthoester), and their relative proportions. By controlling these compositional parameters, the formulation achieves optimal balance between flame retardant performance and long-term heat resistance, transforming the unstable organic P-compound system into a stable composite system

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If conventional flame retardant additives are added to polyester, then flame resistance is improved, but mechanical strength and moldability deteriorate

Engineering Contradiction:

Improveflame resistanceVSAvoidmechanical strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent introduces mineral-like stabilizers (calcium hydroxyapatite, barium carbonate, calcium sulfate) as intermediary substances that mediate between the flame retardant phosphorus compounds and the polyester matrix. These mineral stabilizers act as spacers and protective intermediaries that prevent the phosphorus compounds from degrading the polyester structure, thereby maintaining mechanical strength and moldability while achieving flame resistance

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes the concentration and type of flame retardant additives by combining them with specific ratios of mineral and organic stabilizers. This parameter control ensures that the flame retardant effect is achieved without excessive additive loading that would compromise mechanical properties, maintaining tensile strength and moldability while providing adequate flame resistance

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If halogen-free flame retardant formulations are used, then environmental safety is improved, but processability and moldability deteriorate

Engineering Contradiction:

Improveenvironmental safetyVSAvoidprocessability

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent specifies precise compositional parameters including the use of mineral-like stabilizers (calcium hydroxyapatite, barium carbonate, calcium sulfate) in controlled proportions alongside organic stabilizers with specific functional groups. This parameter optimization ensures that the halogen-free formulation maintains good processability and moldability by preventing excessive viscosity increase and maintaining appropriate melt flow characteristics

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The mineral-like stabilizers serve as intermediary substances that improve the compatibility between halogen-free phosphorus-based flame retardants and the polyester matrix. These intermediaries enhance processability by preventing agglomeration of flame retardant particles and ensuring uniform distribution, thereby maintaining good moldability while achieving environmental safety through halogen-free composition

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7893141B2Halogen-free flame retardant polyester

Publication Date: 2011.02.22 SHPP GLOBAL TECH BV

AI summary

Novel polyester composition comprising a polyester, wherein said polyester comprises structural units derived from substituted or unsubstituted diacid or diester, a substituted or unsubstituted diol; a phosphorus containing compound and at least one selected from a stabilizer and an organic compound comprising at least one functional group is been disclosed. In addition methods for the preparation of the polyester composition and articles derived from said composition is disclosed.