Sealing Sheet With Void-Containing Adhesive Layer

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Solution Overview

Problem

Existing sealing sheets fail to maintain high flame retardance and seal performance when adhered to duralumin plates, and they also generate toxic halogen gases during combustion.

Innovation Solution

A sealing sheet with a flame retardant-containing adhesive layer having a void content of 5-40% is developed, using a polyoxyalkylene adhesive layer composed of a polyoxyalkylene polymer, a compound with hydrosilyl groups, a hydrosilylation catalyst, and a halogen-free flame retardant, which provides superior seal performance and prevents corrosion on duralumin plates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a halogen flame retardant is added to the sealing sheet to achieve high flame retardance, then flame retardance is improved, but toxic halogen gas is generated during combustion

Engineering Contradiction:

Improveflame retardanceVSAvoidtoxic halogen gas generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces harmful halogen flame retardants with halogen-free flame retardants. While halogen flame retardants provide effective flame retardance, they generate toxic halogen gases during combustion. The invention uses halogen-free alternatives that maintain flame retardant performance without producing toxic emissions, thus converting a harmful substance into a safe one while preserving the desired fire safety properties.

Inventive Principle:

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

2Strength

If the void content in the adhesive layer is reduced to improve adhesion strength, then bonding strength is improved, but seal performance and corrosion resistance deteriorate

Engineering Contradiction:

Improveadhesion strengthVSAvoidseal performance and corrosion resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent intentionally introduces controlled voids or porous structures into the adhesive layer. These voids serve multiple functions: they allow for stress distribution and reduction of concentration points that would otherwise cause failure, they provide pathways for corrosion inhibitor migration to the metal interface, and they maintain adequate adhesion strength through the surrounding polymer matrix. The void content is optimized to balance mechanical strength with protective functionality.

Inventive Principle:

Principle #31Porous 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 sealing sheet achieves high flame retardance and seal performance while preventing corrosion on duralumin plates and avoiding the generation of toxic halogen gases during combustion.

Implementation Method 1

a sealing sheet comprising a flame retardant adhesive sheet having a flame retardant-containing adhesive layer

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

a flame retardant-containing polyoxyalkylene adhesive layer which is a cured product layer of a composition containing a polyoxyalkylene polymer having at least one alkenyl group in one molecule, a compound containing two or more hydrosilyl groups on average in one molecule, a hydrosilylation catalyst, and a flame retardant

Methodology Applied

Scientific EffectHydrosilylation: Chemical Bonding

Data Source

PatentUS10472545B2Sealing sheet

Publication Date: 2019.11.12 NITTO DENKO CORP

AI summary

The present invention provides a sealing sheet containing a flame retardant adhesive sheet having a flame retardant-containing adhesive layer, wherein the flame retardant-containing adhesive layer has a void content of 5-40%.