Reactive-Silane Curable Adhesive Composition for Strength-Flexibility Balance
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Solution Overview
Problem
Existing curable compositions fail to provide a cured product with high strength, stiffness, and flexibility, particularly when used as structural adhesives for materials with different thermal expansion coefficients, such as steel, aluminum, and carbon fiber composites.
Innovation Solution
A multi-part curable composition comprising a polyoxyalkylene polymer with reactive silicon groups, a (meth)acrylic ester polymer with reactive silicon groups, and an epoxy resin curing agent, along with an epoxy resin and a silanol condensation catalyst, where the (meth)acrylic ester polymer contains 40-70% alkyl (meth)acrylate with 1-3 carbon atoms, a monomer with a reactive silicon group and polymerizable unsaturated group, and a macromonomer with a polymerizable unsaturated group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resins with high stiffness are used as structural adhesive, then strength is improved, but flexibility to accommodate thermal distortion deteriorates
Solution Approach 1:
The invention uses a composite system combining polyoxyalkylene polymer (providing flexibility) with epoxy resin and reactive silicon group-containing (meth)acrylic ester polymer (providing strength). This multi-component composition creates a cured product that achieves both high strength and flexibility, resolving the contradiction between stiffness and adaptability for thermal distortion accommodation.
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating specific ratios of polyoxyalkylene polymer (1-10 parts), epoxy resin (100 parts), reactive silicon group-containing (meth)acrylic ester polymer (1-50 parts), and silane coupling agent (1-10 parts). This parameter optimization enables the cured product to simultaneously achieve high strength and flexibility.
2Adaptability or versatility
If reactive silicon group-containing polyoxyalkylene polymer and epoxy resin combination is used, then flexibility is improved, but strength deteriorates
Solution Approach 1:
The invention merges three components: polyoxyalkylene polymer (for flexibility), epoxy resin (for strength), and reactive silicon group-containing (meth)acrylic ester polymer (for enhanced strength and adhesion). This combination allows the cured product to achieve both high flexibility and high strength, overcoming the limitation of binary systems.
Solution Approach 2:
The silane coupling agent acts as an intermediary that enhances the bonding between the polyoxyalkylene polymer and epoxy resin matrix, improving overall strength while maintaining the flexibility provided by the polyoxyalkylene segments.
3Reliability
If polyoxyalkylene polymer with reactive silicon groups is used, then adhesion to different materials is improved, but stiffness deteriorates
Solution Approach 1:
The invention applies local quality by having the polyoxyalkylene polymer segments provide flexibility and adhesion at the molecular level, while the epoxy resin and (meth)acrylic ester polymer provide stiffness and structural strength in the bulk material. This spatial differentiation of functions resolves the contradiction between bonding performance and stiffness.
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 achieves a cured product with high strength, stiffness, and flexibility, maintaining excellent bonding performance even after moisture-heat exposure.
Implementation Method 1
a multi-part curable composition including: an A part including a polyoxyalkylene polymer (A) having a reactive silicon group, a (meth)acrylic ester polymer (B) having a reactive silicon group, and an epoxy resin curing agent (D)... a B part including an epoxy resin (C) and a silanol condensation catalyst (E)
Implementation Method 2
an epoxy resin curing agent (D)... a B part including an epoxy resin (C) and a silanol condensation catalyst (E)
Data Source
AI summary
A multi-part curable composition includes: an A part including a polyoxyalkylene polymer (A) having a reactive silicon group, a (meth)acrylic ester polymer (B) having a reactive silicon group, and an epoxy resin curing agent (D); and a B part including an epoxy resin (C) and a silanol condensation catalyst (E). The (meth)acrylic ester polymer (B) is a polymer containing constituent monomers including 40 to 70% by weight of an alkyl (meth)acrylate (b1) having an alkyl having 1 to 3 carbon atoms, a monomer (b2) having a reactive silicon group and a polymerizable unsaturated group, and a macromonomer (b3) that is a (meth)acrylic ester polymer having a polymerizable unsaturated group.