Thermoplastic Elastomer Adhesion to Ceramics and Metals
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Solution Overview
Problem
Styrene-based thermoplastic elastomers have low adhesive force to ceramics and metals, requiring high-temperature heat treatments that can deform synthetic resin members and lead to interfacial delamination, necessitating complex processes and high production costs.
Innovation Solution
A thermoplastic elastomer composition comprising a hydrogenated block copolymer with structural units derived from aromatic vinyl compounds and farnesene, combined with a polar group-containing olefinic polymer, allowing adhesion at lower temperatures without primer treatments, ensuring cohesive failure in peel tests and strong adhesive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature heat treatment (200°C or higher) is applied to achieve adhesion to ceramics and metals, then adhesive force is improved, but synthetic resin members are melted and deformed
Solution Approach 1:
The invention changes the chemical composition parameters of the thermoplastic elastomer by incorporating polar group-containing compounds (5-50 mass% relative to total elastomer) into the styrene-based elastomer matrix. This compositional modification enables the material to achieve adequate adhesion to ceramics and metals at lower temperatures (below 200°C), thereby preventing deformation of synthetic resin members while maintaining strong adhesive bonds
2Strength
If primer treatment or adhesive application is performed to improve adhesion, then adhesive force is improved, but process complexity and production costs increase
Solution Approach 1:
The invention makes the thermoplastic elastomer itself possess adhesive properties through the incorporation of polar group-containing compounds. The modified elastomer can directly bond to ceramics, metals, and synthetic resins without requiring external primers or separate adhesive applications. This self-adhesive capability eliminates additional process steps and reduces production complexity while maintaining strong adhesion
3Strength
If high-temperature heat treatment is applied to achieve adhesion, then adhesive force is improved, but interfacial delamination occurs
Solution Approach 1:
The invention modifies the chemical parameters of the thermoplastic elastomer by adding polar group-containing compounds that create compatible interfaces with both inorganic substrates (ceramics, metals) and organic materials (synthetic resins). This chemical modification enables the elastomer to form reliable bonds at lower temperatures, preventing interfacial delamination while achieving sufficient adhesive strength
4Strength
If polyvinyl acetal is added to improve adhesion, then adhesive force is improved, but heat treatment temperature must be increased to 240°C or higher
Solution Approach 1:
The invention changes the chemical composition by incorporating polar group-containing compounds with carefully selected characteristics (5-50 mass% content, specific molecular weight ranges, and appropriate chemical structures). This compositional adjustment enables the thermoplastic elastomer to achieve effective adhesion at moderate temperatures (below 200°C), avoiding the need for high-temperature treatment (240°C or higher) that would be required if polyvinyl acetal were used
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 flexible and moldable adhesion to ceramics, metals, and resins at low temperatures, preventing deformation and interfacial delamination, while maintaining strong adhesive properties and reducing production costs.
Implementation Method 1
a thermoplastic elastomer composition comprising 100 parts by mass of a hydrogenated block copolymer (A) and 5 to 300 parts by mass of a polar group-containing olefinic polymer (B)
Data Source
AI summary
A thermoplastic elastomer composition comprising 100 parts by mass of a hydrogenated block copolymer (A) comprising a polymer block (a) consisting of a structural unit derived from an aromatic vinyl compound and a polymer block (b) comprising 1 to 100% by mass of a structural unit (b1) derived from farnesene and comprising 99 to 0% by mass of a structural unit (b2) derived from a conjugated diene other than farnesene, a mass ratio [(a)/(b)] of the polymer block (a) to the polymer block (b) being 1/99 to 70/30; and 5 to 300 parts by mass of a polar group-containing olefinic polymer (B), is excellent in flexibility and molding processability and capable of adhering to a ceramic, a metal, a synthetic resin, or the like even through a heat treatment at low temperatures (for example, 190° C. or lower) without requiring a primer treatment or the like.