Crosslinked Polyolefin Foam Touch and Strength Balance
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Solution Overview
Problem
Crosslinked polyolefin foams used in vehicle interiors face challenges in achieving improved flexibility and touch feeling without compromising compressive strength and molding properties, as increased elastomer content can lead to reduced mechanical strength and worsened molding properties.
Innovation Solution
A crosslinked polyolefin foam composition with a polypropylene resin and olefin rubber, where the 25% compressive strength is between 40 to 70 kPa and tensile strength is 0.5 to 1.5 MPa, with a crosslinking degree of 30 to 65%, allowing for balanced molding properties and touch feeling, achieved by adjusting the resin ratios and crosslinking degree.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the amount of elastomer is increased to achieve softer touch, then flexibility and touch feeling are improved, but mechanical strength and molding properties are reduced
Solution Approach 1:
The invention changes the compositional parameters by specifying a precise ratio range of polypropylene resin to olefin rubber (45/55 to 70/30) and controlling the content of other resin components (20 parts by mass or less relative to 100 parts by mass of polypropylene resin). This parameter optimization achieves the desired balance between soft touch feeling and mechanical strength without requiring excessive elastomer content
Solution Approach 2:
The invention uses a composite material system consisting of polypropylene resin, olefin rubber, and controlled amounts of other resin components. This composite approach allows the material to exhibit both the flexibility from olefin rubber and the structural integrity from polypropylene resin, resolving the contradiction between soft touch and mechanical strength
2Ease of operation
If the compressive strength is reduced to achieve softer touch, then flexibility is improved, but molding properties in secondary processing are worsened
Solution Approach 1:
The invention optimizes the compositional parameters within specific ranges: polypropylene resin/olefin rubber ratio of 45/55 to 70/30 and other resin component content of 20 parts by mass or less relative to 100 parts by mass of polypropylene resin. These controlled parameters ensure the foam maintains appropriate compressive strength (40-70 kPa) while preserving molding properties for secondary processing
Solution Approach 2:
The invention applies different functional requirements to different aspects of the material: the polypropylene resin provides structural integrity for molding, while the olefin rubber provides flexibility and soft touch. This functional differentiation within the composite allows simultaneous achievement of flexibility and good molding 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 solution provides crosslinked polyolefin foams with enhanced molding properties and excellent touch feeling, balancing compressive and tensile strengths within a predetermined range to improve tactile sensation and maintain mechanical strength.
Implementation Method 1
a crosslinked polyolefin foam made by crosslinking and foaming a polyolefin resin composition
Implementation Method 2
a crosslinked polyolefin foam made by crosslinking and foaming a polyolefin resin composition
Data Source
AI summary
Provided is a crosslinked polyolefin foam is made by crosslinking and foaming the composition, wherein a product of 25% compressive strength (kPa) and tensile strength (MPa) of the crosslinked polyolefin foam at normal temperature is 35 to 65.