Polyolefin Foam Beads Cover Layer Adhesion
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Solution Overview
Problem
Existing composite laminated bodies using polyolefin resin expanded beads face challenges with solvent resistance and adhesiveness to thermosetting resins, limiting their mechanical properties and shape retention due to issues like poor adhesion and heat resistance.
Innovation Solution
A composite laminated body is created using polyolefin resin expanded beads with a multi-layer structure, featuring a foamed core layer and a cover layer with a specific mixing ratio of polyolefin resin and other resins like polystyrene or polyester, enhanced with a compatibilizing agent for improved adhesion and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyolefin resin expanded beads are used as core material, then heat resistance is improved, but adhesiveness to thermosetting resin deteriorates
Solution Approach 1:
The invention uses a composite structure where polyolefin resin expanded beads (providing heat resistance) are combined with a thermoplastic resin layer (providing adhesiveness). This multi-material approach allows simultaneous achievement of heat resistance from the polyolefin core and good adhesion from the thermoplastic resin interface with the thermosetting resin.
Solution Approach 2:
The thermoplastic resin layer acts as an intermediary between the polyolefin resin expanded beads and the thermosetting resin. This intermediate layer facilitates adhesion while allowing the polyolefin core to maintain its heat resistance properties without direct exposure to the thermosetting resin.
2Strength
If FRP is used to enhance mechanical properties by increasing thickness, then bending strength is improved, but weight increases and heat generation during curing deteriorates
Solution Approach 1:
The invention applies reinforcement locally where needed by using a foam core structure with strategic placement of reinforcing elements. The foam core provides structural support with minimal weight, while localized reinforcement areas provide necessary strength, avoiding the need to increase overall thickness and weight throughout the entire structure.
Solution Approach 2:
The composite structure is segmented into distinct functional layers: a lightweight foam core for structural support, and targeted reinforcement zones for strength enhancement. This segmentation allows optimization of each zone's properties without compromising the overall weight-to-strength ratio.
3Ease of manufacture
If polystyrene resin expanded beads are used for excellent moldability, then ease of manufacture is improved, but solvent resistance deteriorates
Solution Approach 1:
The thermoplastic resin layer serves as an intermediary protective barrier between the polystyrene resin expanded beads and solvent-containing thermosetting resins. This intermediate layer prevents direct contact and potential dissolution, while allowing the polystyrene core to maintain its excellent moldability characteristics.
Solution Approach 2:
The invention creates a composite structure combining polystyrene resin expanded beads (providing moldability) with a thermoplastic resin coating layer (providing solvent resistance). This composite approach allows simultaneous achievement of both excellent moldability and solvent resistance by assigning each function to the appropriate material layer.
Data Source
AI summary
The present invention relates to polyolefin resin expanded beads containing multi-layer expanded beads containing a core layer in a foamed state containing a polyolefin resin and a cover layer coated on the core layer, the cover layer containing a mixed resin of a polyolefin resin (A) and at least one resin (B) selected from a polystyrene resin and a polyester resin, and the mixed resin having a weight ratio (A/B) of the polyolefin resin (A) and the resin (B) of from 15/85 to 90/10, and a composite laminated body using an expanded beads molded body thereof, and the expanded beads molded body is excellent in solvent resistance and also excellent in adhesiveness to a thermosetting resin on the surface of the molded body, and can provide a composite laminated body excellent in productivity with a thermosetting resin.