Thermoplastic Elastomer Composition for Polar-Material Bond Strength
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Solution Overview
Problem
Existing styrene-based thermoplastic elastomers lack sufficient bond strength with highly polar materials and suffer from contamination, flexibility, tensile characteristics, shaping processability, heat resistance, and weather resistance issues.
Innovation Solution
A thermoplastic elastomer composition comprising an acrylic block copolymer and a hydrogenated block copolymer, with specific ratios and hydrogenation levels, enhancing bond strength and flexibility while maintaining processability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a highly polar tackifier resin is added to an aromatic vinyl-conjugated diene block copolymer to improve adhesion with highly polar materials, then bond strength with highly polar materials is improved, but contamination of materials occurs
Solution Approach 1:
The invention changes the chemical composition parameters by using a hydrogenated block copolymer with specific structural units (aromatic vinyl compound units, conjugated diene units, and farnesene units) in controlled ratios, along with acrylic block copolymer, to achieve adhesion to highly polar materials without the contamination issues associated with traditional tackifier resins
Solution Approach 2:
The invention creates a composite thermoplastic elastomer material combining hydrogenated block copolymer and acrylic block copolymer in specific weight ratios (70:30 to 300:100) to achieve both adhesion to highly polar materials and avoidance of contamination, replacing the need for separate tackifier resin additives
2Strength
If thermoplastic resin compositions include polyurethane-based block copolymer and other additives to improve adhesion, then bond strength is improved, but flexibility, tensile characteristics, shaping processability, heat resistance, weather resistance and water resistance become insufficient
Solution Approach 1:
The invention optimizes the molecular structure parameters of the base polymers by controlling the types and ratios of structural units (aromatic vinyl, conjugated diene, farnesene) in the hydrogenated block copolymer and the composition of acrylic block copolymer, achieving both adhesion and durability without relying on polyurethane-based additives that compromise reliability
Solution Approach 2:
The invention extracts and eliminates the need for polyurethane-based block copolymers and other complex additives by using the inherent properties of the hydrogenated block copolymer with specific structural units to provide both adhesion and durability functions
3Ease of operation
If styrene-based thermoplastic elastomers are used for flexibility and shaping processability, then flexibility and shaping processability are improved, but bond strength with highly polar materials becomes insufficient
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating aromatic vinyl compound structural units and conjugated diene structural units in specific ratios within the hydrogenated block copolymer, enabling both good shaping processability and strong bonding to highly polar materials
Solution Approach 2:
The invention creates a composite system combining hydrogenated block copolymer with acrylic block copolymer in specific weight ratios to achieve synergistic effects, maintaining the flexibility and processability of styrene-based elastomers while adding the ability to bond with highly polar 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 composition achieves excellent bond strength with highly polar materials, wide hardness adjustability, and improved tensile characteristics and shaping processability, with enhanced durability and heat resistance.
Implementation Method 1
the hydrogenation ratio of carbon-carbon double bonds in the polymer block (B1) is 50 to 100 mol %
Data Source
AI summary
A thermoplastic elastomer composition including an acrylic block copolymer (I) and a hydrogenated block copolymer (II). The content of the acrylic block copolymer (I) is 70 to 300 parts by mass with respect to 100 parts by mass of the hydrogenated block copolymer (II); the hydrogenated block copolymer (II) is a hydrogenated product of a block copolymer (P) including a polymer block (A1) containing structural units derived from an aromatic vinyl compound, and a polymer block (B1) containing 1 to 100 mass % of structural units (b1) derived from farnesene and 99 to 0 mass % of structural units (b2) derived from a conjugated diene other than farnesene, the mass ratio [(A1)/(B1)] of the polymer block (A1) to the polymer block (B1) being 1/99 to 70/30; and the hydrogenation ratio of carbon-carbon double bonds in the polymer block (B1) is 50 to 100 mol %.