Carbon Fiber Bundle Coating for Polypropylene Interface Adhesion
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Solution Overview
Problem
Current methods for improving interface adhesion between carbon fibers and polyolefin resins, particularly polypropylene, are inefficient due to poor recyclability, high costs, and insufficient mechanical property enhancement, with existing sizing treatments failing to achieve consistent and strong bonding.
Innovation Solution
Applying an amino group-containing modified polyolefin resin to the carbon fiber bundle, followed by a heat treatment at 200 to 300°C for 5 seconds to 3 minutes, to enhance the interaction between the carbon fibers and the polyolefin resin, thereby improving interface adhesion and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If acid-modified polyolefin resin is added to improve interface adhesion, then adhesion between carbon fiber and polyolefin resin is improved, but the cost increases and recyclability deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the polyolefin resin by introducing amino groups through reaction with isocyanate compounds. This modification creates reactive functional groups that form strong chemical bonds with carbon fiber surfaces, achieving excellent interface adhesion without requiring acid modification or additional coupling agents, thus maintaining cost-effectiveness and recyclability
Solution Approach 2:
The invention creates a composite sizing agent system combining modified polyolefin resin with isocyanate compounds. This composite material provides both the adhesion benefits of chemical modification and the processability of thermoplastic resins, achieving strong interface bonding while maintaining the economic and environmental advantages of polyolefin-based systems
2Ease of manufacture
If polyolefin resin is used as matrix resin, then recyclability and economics are improved, but interface adhesion to carbon fiber deteriorates due to non-polar nature
Solution Approach 1:
The invention chemically modifies the polyolefin resin by introducing amino functional groups that can form hydrogen bonds and chemical linkages with carbon fiber surfaces. This parameter change transforms the non-polar polyolefin into a material with polar character, enabling strong adhesion to carbon fiber while retaining the base polyolefin's recyclability and economic advantages
Solution Approach 2:
The amino-modified polyolefin resin acts as an intermediary between the non-polar polyolefin matrix and the carbon fiber reinforcement. The isocyanate groups on the modified resin form strong bonds with carbon fiber surfaces while the polyolefin backbone maintains compatibility with the matrix resin, bridging the adhesion gap between dissimilar materials
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 method achieves excellent interface adhesion and mechanical property enhancement for carbon fiber bundles with polyolefin resins, particularly polypropylene, resulting in improved bending strength, impact strength, and flexural modulus.
Implementation Method 1
Applying an amino group-containing modified polyolefin resin to the carbon fiber bundle
Implementation Method 2
heat treatment at 200 to 300°C for 5 seconds to 3 minutes
Data Source
AI summary
The present invention relates to a carbon fiber bundle to which an amino group-containing modified polyolefin resin has applied, wherein the amount of applying amino group-containing modified polyolefin resin is 0.2 to 5.0% by mass. This carbon fiber bundle can be produced by applying 0.2 to 5.0% by mass of the amino group-containing modified polyolefin resin to the surface of the carbon fiber bundle. The present invention can exhibit excellent interface adhesion to a polyolefin resin, particularly to a polypropylene resin, and can provide a carbon fiber bundle useful for reinforcing the polyolefin resin and a method of producing the same.