Flame-Retardant Polystyrene Insulation via Partial Particle Coating

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Solution Overview

Problem

Conventional rigid polystyrene foam panels offer good thermal insulation but are combustible, posing fire safety risks, and existing fire-retardant modifications compromise mechanical stability and insulation properties.

Innovation Solution

A method using pre-foamed polystyrene particles coated with a binder and flame retardants, allowing partial coating and sintering to maintain mechanical stability while reducing binder content, and incorporating expandable graphite for enhanced fire resistance, allowing the use of organic binders with improved binding properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If non-combustible inorganic binders are used to ensure fire resistance, then fire protection is improved, but binding power is reduced causing segregation of starting materials

Engineering Contradiction:

Improvefire protectionVSAvoidbinding power

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies different binder types to different functional requirements: organic binder provides strong adhesion for binding polystyrene particles, while inorganic flame retardant particles provide fire protection. This local differentiation of material functions resolves the contradiction between binding power and fire resistance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention creates a composite binder system combining organic binder (for adhesion) with inorganic flame retardant particles (for fire protection). This composite approach allows simultaneous achievement of strong binding and fire resistance, resolving the contradiction between these two properties.

Inventive Principle:

Principle #40Composite materials

2Strength

If binder content is increased to ensure mechanical stability, then mechanical strength is improved, but fire resistance deteriorates due to combustible binder

Engineering Contradiction:

Improvemechanical stabilityVSAvoidfire resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent optimizes the binder content to a specific range (0.1-5% by weight) and changes the binder composition by adding inorganic flame retardant particles. This parameter optimization allows maintaining mechanical stability while improving fire resistance, resolving the contradiction between these properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention converts the harmful effect of combustible binder by incorporating inorganic flame retardant particles that release water upon heating. This transforms the binder system from purely combustible to fire-retardant, resolving the contradiction between mechanical stability and fire resistance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If polystyrene particle proportion is reduced to add intumescent material, then fire behavior is improved, but thermal insulation properties deteriorate

Engineering Contradiction:

Improvefire behaviorVSAvoidthermal insulation

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The patent converts the potential harm of reduced polystyrene content by using inorganic flame retardant particles that provide both fire protection and maintain thermal insulation properties. This resolves the contradiction between improved fire behavior and maintained thermal insulation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention changes the composition parameters by incorporating specific proportions of inorganic flame retardant particles (5-50% by weight) while maintaining adequate polystyrene content. This parameter optimization ensures both improved fire behavior and preserved thermal insulation properties.

Inventive Principle:

Principle #35Parameter changes

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 method produces a flame-retardant insulating element with improved fire resistance and thermal insulation, maintaining mechanical stability and allowing for cost-effective production using existing systems, while preventing the formation of binder webs that could spread fire.

Implementation Method 1

the prefoamed polystyrene particles are at least partially coated with a formulation containing acrylate, styrene acrylate, vinyl acetate, vinyl acetate-ethylene and/or vinyl chloride as an organic binder and with at least one flame retardant

Methodology Applied

Scientific EffectCoating: Coatings

Implementation Method 2

the coated prefoamed polystyrene particles be placed in a mold and sintered

Methodology Applied

Scientific EffectSintering: Sintering

Implementation Method 3

incorporating expandable graphite for enhanced fire resistance

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 4

preventing the formation of binder webs that could spread fire

Methodology Applied

Scientific EffectFire retardation: Intumescent Materials

Data Source

PatentEP3184709B1Method for producing a flame retardant insulating element, insulating element and use of an insulating element

Publication Date: 2019.11.06 STO SE & CO KGAA

AI summary

The invention relates to a method for producing a flame-retardant insulation element in which pre-expanded polystyrene particles are used, at least some of which are coated before being poured into a mold and sintered. According to the invention, the pre-expanded polystyrene particles are at least partially coated with an organic binder and with at least one flame retardant. The invention further relates to an insulation element and to the use of an insulation element produced according to a method according to the invention.