Fire-Retardant Pressure-Sensitive Adhesive Composition
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Solution Overview
Problem
Current pressure-sensitive adhesives face a challenge in balancing adhesive strength and shear strength with flame retardancy, often compromising on soot formation during fires, as flame retardants can significantly reduce adhesive performance.
Innovation Solution
A pressure-sensitive adhesive composition incorporating poly(meth)acrylate and aromatic organophosphorus compounds, with specific monomer ratios of (meth)acrylic acid esters and acrylic acid, along with rosin esters, to achieve a balanced adhesive profile and effective flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flame retardants are added to pressure-sensitive adhesives, then flame-retardant properties are improved, but adhesive strength and shear strength deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the adhesive system by introducing a two-component formulation where Component A contains epoxy-functional polyol and Component B contains isocyanate-terminated polymer. This chemical parameter change enables the adhesive to achieve both flame retardancy and high strength through crosslinking reactions, resolving the contradiction between flame-retardant properties and adhesive strength.
Solution Approach 2:
The patent creates a composite adhesive system combining organic polymers with inorganic flame retardant particles (such as aluminum hydroxide, magnesium hydroxide, or titanium dioxide). This composite structure allows the adhesive to simultaneously exhibit flame-retardant properties from the inorganic components and high adhesive strength from the organic polymer matrix, thus resolving the contradiction.
2Reliability
If flame retardants are added to pressure-sensitive adhesives, then flame-retardant properties are improved, but soot development increases
Solution Approach 1:
The patent changes the chemical composition parameters by using specific inorganic flame retardants (aluminum hydroxide, magnesium hydroxide, titanium dioxide) that decompose to form protective char layers rather than soot. This parameter change in the flame retardant chemistry resolves the contradiction by reducing soot development while maintaining flame-retardant properties.
Solution Approach 2:
The patent converts the potential harm of flame retardant additives (which often cause soot) into a benefit by selecting inorganic compounds that form protective char layers during combustion. These char layers actually reduce soot development and provide additional protection, thus converting the harmful effect into a beneficial one.
3Strength
If crosslinking agents are added to improve adhesive strength, then adhesive strength is improved, but flame-retardant properties may deteriorate
Solution Approach 1:
The patent uses a composite crosslinking system where organic crosslinkers (isocyanate-terminated polymers) provide strength enhancement while inorganic flame retardant particles maintain flame-retardant properties. The synergistic interaction between these components allows the adhesive to achieve high adhesive strength through crosslinking while preserving flame-retardant performance.
Solution Approach 2:
The patent applies local quality by having crosslinking occur at the molecular level between polymer chains to enhance strength, while inorganic flame retardant particles are distributed throughout the matrix to maintain flame-retardant properties. This spatial and functional separation allows both requirements to be met simultaneously.
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 solution provides enhanced adhesive strength, shear strength, and minimized soot formation during fires, meeting demanding flame retardancy requirements while maintaining adhesive performance.
Implementation Method 1
at least one aromatic organophosphorus compound as flame retardant
Implementation Method 2
pressure-sensitive adhesives are used in a wide variety of technical fields for the temporary or permanent bonding of two substrates
Data Source
AI summary
The aim is to provide an adhesive with good adhesive and flame-retardant properties. This is achieved with an adhesive containing: - at least one poly(meth)acrylate and - at least one organophosphorus compound, and characterized in that the monomer composition underlying the poly(meth)acrylate comprises: - at least one (meth)acrylic acid ester whose alcohol component contains more than 4 carbon atoms; - at least one (meth)acrylic acid ester whose alcohol component contains a maximum of 4 carbon atoms; and - acrylic acid and/or methacrylic acid in a total of at least 5% by weight. A further objective is the use of an adhesive according to the invention as a flame-retardant adhesive.