Method for manufacturing carbon fiber
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Solution Overview
Problem
Existing carbon fibers lack sufficient surface activity and interface bonding performance with resin, limiting their mechanical performance in composite materials.
Innovation Solution
An electrochemical oxidation method is employed to introduce oxygen-containing functional groups on the carbon fiber surface by anodic electrolysis in specific electrolytes, controlling parameters such as conductivity, voltage, electricity amount, and treatment time to enhance surface reactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional surface treatment methods are used, then production process is simple, but surface activity and interface bonding performance are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the electrolyte (using specific ratios of H2SO4, H3PO4, and CH3COOH) and electrical parameters (voltage, current density, treatment time) to optimize surface oxidation effectiveness. This resolves the contradiction by achieving high interface bonding performance through controlled parameter adjustments rather than complex multi-step processes
Solution Approach 2:
The invention replaces conventional mechanical or chemical surface treatment methods with an electrochemical oxidation system. By using electrical current to generate active oxygen species in the electrolyte, the process achieves superior surface activation and bonding performance while maintaining operational simplicity
2Productivity
If electrolyte conductivity is increased to improve treatment efficiency, then surface oxidation effectiveness improves, but energy consumption increases
Solution Approach 1:
The invention optimizes electrolyte composition to achieve balanced conductivity (not excessively high) while maintaining effective surface oxidation. The specific electrolyte formulation (containing H2SO4, H3PO4, and CH3COOH in controlled ratios) provides sufficient ionic conductivity for efficient treatment without requiring excessive energy input, thus resolving the productivity-energy consumption contradiction
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 treated carbon fibers exhibit improved mechanical properties and enhanced bonding with resin, resulting in high tensile strength and durability in composite bottles.
Implementation Method 1
performing a surface treatment, wherein a surface of the carbon fiber is oxidized by active oxygen generated by anodic electrolysis
Implementation Method 2
a surface of the carbon fiber is oxidized by active oxygen generated by anodic electrolysis, and thereby oxygen-containing functional groups are introduced to the surface
Data Source
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AI summary
A method for manufacturing carbon fiber, the method includes: placing a carbon fiber as an anode in an electrolyte, wherein the electrolyte is nitric acid, sulfuric acid, phosphoric acid, acetic acid, ammonium bicarbonate, sodium hydroxide, or potassium nitrate; and performing a surface treatment, wherein a surface of the carbon fiber is oxidized by active oxygen generated by anodic electrolysis, and thereby oxygen-containing functional groups are introduced to the surface. The disclosure also provides a carbon fiber composite bottle, which includes a bottle body and a carbon fiber. The bottle body is a type III bottle or a type IV bottle. The carbon fiber surrounds the bottle body, the surface oxygen concentration of the carbon fiber is 5-35%, and the surface roughness of the carbon fiber is 5-25 nm.