Resin composition, foamable composition, and crosslinked foam body
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Solution Overview
Problem
Hydrogenated block copolymers used for vibration damping lack improvements in moldability and flexibility at low temperatures while maintaining vibration damping capability around room temperature.
Innovation Solution
A resin composition comprising a hydrogenated block copolymer with specific glass transition temperatures and a block copolymer containing a structural unit derived from β-farnesene, blended in specific ratios to enhance moldability and flexibility at low temperatures while retaining vibration damping capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrogenated block copolymer is used to improve vibration damping capability, then vibration damping performance is improved, but moldability and flexibility at low temperatures deteriorate
Solution Approach 1:
The invention uses a composite material system consisting of a hydrogenated block copolymer (providing vibration damping) and a block copolymer containing β-farnesene units (providing moldability and low-temperature flexibility). This composite approach allows both vibration damping performance and processing characteristics to be achieved simultaneously through synergistic combination of different polymer components.
Solution Approach 2:
The invention changes the glass transition temperature parameter of the polymer system by introducing a block copolymer with Tg of -50°C or lower (component y) containing β-farnesene units. This parameter change enables the material to maintain flexibility at low temperatures while the hydrogenated block copolymer (component x) with Tg of -40°C or higher maintains vibration damping capability.
2Reliability
If a hydrogenated block copolymer is used to improve vibration damping capability, then vibration damping performance is improved, but flexibility at low temperatures deteriorates
Solution Approach 1:
The composite material system combines a hydrogenated block copolymer (for vibration damping) with a block copolymer containing β-farnesene units (for low-temperature flexibility). The specific composition ratio (1/99 to 99/1 by mass) allows the material to exhibit both vibration damping capability and flexibility at low temperatures through the synergistic effect of the two components.
Solution Approach 2:
The invention modifies the glass transition temperature parameter by incorporating component (y) with Tg of -50°C or lower, which contains β-farnesene structural units. This parameter modification enables the material to maintain operational flexibility at low temperatures while preserving the vibration damping properties provided by component (x).
3Reliability
If the glass transition temperature of the hydrogenated block copolymer is increased to improve vibration damping, then vibration damping capability is improved, but moldability deteriorates
Solution Approach 1:
The invention segments the polymer system into two distinct functional components: component (x) with Tg of -40°C or higher that provides vibration damping capability, and component (y) with Tg of -50°C or lower that provides moldability. This segmentation allows each component to optimize its specific function while working together in a blended system.
Solution Approach 2:
The invention creates a composite material system where component (x) (hydrogenated block copolymer for vibration damping) and component (y) (block copolymer with β-farnesene for moldability) are combined in specific ratios. This composite structure enables the material to simultaneously achieve high vibration damping performance and good moldability that neither component could achieve alone.
4Ease of manufacture
If a block copolymer containing β-farnesene is added to improve moldability, then moldability is improved, but vibration damping properties may deteriorate
Solution Approach 1:
The invention carefully controls the glass transition temperature parameter of component (y) containing β-farnesene units, specifying Tg of -50°C or lower. This parameter control ensures that the addition of component (y) for improving moldability does not significantly shift the overall Tg of the blend, thereby preserving the vibration damping properties that depend on the Tg of component (x).
Solution Approach 2:
The invention applies local quality by assigning different functional roles to different components: component (x) is optimized for vibration damping with Tg of -40°C or higher, while component (y) is optimized for moldability with Tg of -50°C or lower and contains β-farnesene units. This functional differentiation allows each component to excel at its specific function while minimizing interference with the other component's properties.
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 resin composition exhibits improved moldability and flexibility at low temperatures while maintaining vibration damping capability around room temperature, with the addition of a block copolymer containing β-farnesene units, which prevents deterioration of vibration damping properties.
Implementation Method 1
the glass transition temperatures of the component (x) and the component (y) are specified
Implementation Method 2
The hydrogenated block copolymer has a vibration damping capability
Data Source
AI summary
A resin composition containing: as a component (x), a hydrogenated product (X) of a block copolymer having a polymer block (A-1) derived from an aromatic vinyl compound and a polymer block (B-1) derived from a conjugated diene compound; and as a component (y), a block copolymer (YO) having a polymer block (A-2) derived from an aromatic vinyl compound and a polymer block (B-2) derived from a conjugated diene compound, or a hydrogenated product thereof (Y), satisfying the following requirements [1] to [4]: [1] the component (x) has a glass transition temperature of −40°° C. or more, [2] the component (y) has a glass transition temperature of −50° C. or less, [3] the resin composition has a ratio Mx/My of a mass Mx of the component (x) with respect to a mass My of the component (y) of 1/99 to 99/1, and [4] the polymer block (B-2) contains a structural unit derived from β-farnesene.