Fiber Sizing Composition for Stronger FRPs With Less Strand Fuzzing
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Solution Overview
Problem
Existing methods for producing fiber-reinforced plastics (FRPs) are complex and do not achieve high mass productivity, and they struggle to enhance mechanical strength, such as impact resistance and flexural strength, with issues like strand fuzzing during extrusion.
Innovation Solution
A composition comprising a conjugated diene-based polymer with functional groups like alkoxysilyl or amino groups, used as a sizing agent for fibers, which improves interfacial adhesion between fibers and a thermoplastic resin, enhancing mechanical strength and productivity by reducing fuzzing during extrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional sizing agents and production methods are used, then the production process can be maintained with existing complexity, but mechanical strength (impact resistance and flexural strength) cannot be improved and mass productivity is limited due to strand fuzzing during extrusion
Solution Approach 1:
The invention changes the chemical composition parameters of the sizing agent by incorporating specific compounds (silane coupling agents, oxidizing agents, and their reaction products) to improve mechanical strength without complicating the production process. The sizing agent formula is optimized to achieve enhanced impact resistance and flexural strength while maintaining processability.
Solution Approach 2:
The invention uses composite material principles by combining multiple functional components in the sizing agent (silane coupling agents, oxidizing agents, and their reaction products) to create a synergistic effect that improves mechanical strength. This composite approach allows simultaneous enhancement of fiber-matrix adhesion and resistance to strand fuzzing during extrusion.
2Productivity
If conventional sizing agents are used, then existing production processes can be maintained, but mass productivity is reduced due to strand fuzzing during extrusion
Solution Approach 1:
The invention extracts and addresses the root cause of strand fuzzing by incorporating specific chemical compounds (silane coupling agents and oxidizing agents) into the sizing agent formulation. This targeted approach eliminates the harmful fuzzing effect during extrusion, thereby improving mass productivity without requiring changes to the extrusion process itself.
Solution Approach 2:
The invention changes the chemical parameters of the sizing agent to reduce surface friction and improve strand integrity during extrusion. By optimizing the composition with silane coupling agents and oxidizing agents, the sizing agent prevents strand fuzzing, enabling higher production rates with better product quality.
3Strength
If fiber content is increased to improve mechanical strength, then strength depends on dispersion state, but production complexity increases and mass productivity decreases
Solution Approach 1:
The invention uses the sizing agent as an intermediary substance that facilitates uniform fiber dispersion in the matrix resin. The silane coupling agents and oxidizing agents in the sizing agent act as mediators that improve fiber-matrix interfacial adhesion, allowing high fiber content to be maintained without compromising processability or productivity.
Solution Approach 2:
The invention changes the surface chemistry parameters of the fibers through the sizing agent treatment. By modifying fiber surface properties with silane coupling agents and oxidizing agents, the invention achieves improved dispersion state at high fiber contents, enabling both enhanced mechanical strength and maintained mass productivity.
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 produces FRPs with improved mechanical strength, including impact resistance and flexural strength, while simplifying the production process and reducing fuzzing issues, thereby increasing mass productivity.
Implementation Method 1
the conjugated diene-based polymer (A) includes at least one functional group selected from the group consisting of an alkoxysilyl group and an amino group
Implementation Method 2
a sizing agent that includes an aminosilane-based coupling agent
Implementation Method 3
the fibers (B) having been treated with the sizing agent according to any one of Application Examples 1 to 3
Data Source
AI summary
A composition improves mechanical strength (e.g., impact resistance and flexural strength), and achieves improved mass productivity by reducing a situation in which a strand fuzzes during extrusion. The composition includes a conjugated diene-based polymer (A), fibers (B), and a thermoplastic resin (C), the composition including the conjugated diene-based polymer (A) in a ratio of 0.05 to 30 parts by mass based on 100 parts by mass of the thermoplastic resin (C), and including the fibers (B) in a ratio of 3 to 150 parts by mass based on 100 parts by mass of the thermoplastic resin (C), wherein the conjugated diene-based polymer (A) includes at least one functional group selected from the group consisting of an alkoxysilyl group and an amino group.