Resin Composition with Compatibilizer for Fiber Adhesion
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Solution Overview
Problem
Conventional resin compositions containing thermoplastic resins and carbon fibers struggle to achieve a balance between toughness and flexural modulus, often compromising on mechanical strength due to low adhesion at the fiber-resin interface and limited compatibility between reinforcing fibers.
Innovation Solution
A resin composition combining polyethylene or polypropylene thermoplastic resin with carbon and glass fibers, a polyamide with aromatic rings, and a maleic anhydride-modified polyolefin compatibilizer, which forms a coating layer around the fibers to enhance adhesion and compatibility, thereby improving toughness and flexural modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon fibers are used as reinforcing fibers in thermoplastic resin, then flexural modulus is improved, but toughness deteriorates due to low adhesion at fiber-resin interface
Solution Approach 1:
The patent introduces a compatibilizer (polyolefin modified with maleic anhydride) as an intermediary substance between the carbon fibers and thermoplastic resin. This compatibilizer forms a coating layer around the carbon fibers, improving the interfacial adhesion and compatibility between the hydrophobic carbon fibers and the thermoplastic resin matrix, thereby simultaneously enhancing both flexural modulus and toughness
Solution Approach 2:
The patent creates a composite material system consisting of thermoplastic resin, carbon fibers, glass fibers, polyamide, and compatibilizer. The combination of different fiber types (carbon and glass) with specific polyamide components forms a multi-phase composite structure that balances stiffness (from carbon fibers) and toughness (from glass fibers and polyamide matrix), resolving the contradiction between flexural modulus and toughness
2Strength
If polyamide content is increased to improve adhesion, then fiber-resin interface adhesion is improved, but cost increases
Solution Approach 1:
The patent optimizes the polyamide content within a specific range (0.1-100 parts by mass per 100 parts thermoplastic resin) and controls the mass ratio of carbon to glass fibers (0.01-10). By adjusting these parameters, the patent achieves sufficient adhesion improvement without excessive polyamide addition, thereby controlling costs while maintaining performance
Solution Approach 2:
The compatibilizer (polyolefin modified with maleic anhydride) serves as a cost-effective intermediary that enhances adhesion between fibers and resin without requiring large amounts of expensive polyamide. The compatibilizer forms a coating layer that improves interfacial bonding, reducing the overall quantity of polyamide needed while maintaining adhesion levels
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 a resin molded body with enhanced toughness and flexural modulus, improved adhesion, and cost-effectiveness compared to using acrylonitrile butadiene styrene copolymer or styrene polymer, while maintaining moldability and mechanical strength.
Implementation Method 1
a maleic anhydride-modified polyolefin compatibilizer, which forms a coating layer around the fibers to enhance adhesion and compatibility
Implementation Method 2
A resin composition combining polyethylene or polypropylene thermoplastic resin with carbon and glass fibers, a polyamide with aromatic rings
Data Source
Figure 1~2
AI summary
A resin composition which comprises a thermoplastic resin, carbon fibers, glass fibers, a resin containing amide bonds and/or imide bonds, and a compatibilizer.