Sizing agent composition, sizing agent, carbon fiber covered with sizing agent, and composite material
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Solution Overview
Problem
Conventional sizing agent compositions for carbon fibers face challenges such as reduced thermal stability, poor emulsification stability, and decreased interlayer bonding strength of composite materials due to thermal decomposition and chemical restructuring during high-temperature processing.
Innovation Solution
A sizing agent composition comprising polyamic acid and an alkali agent with a specific molecular weight and molar ratio, which enhances the emulsification stability of polyamic acid and the thermal stability of the sizing layer, thereby improving the interlayer bonding strength of composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional sizing agent compositions are used to improve impregnation of carbon fibers, then resin matrix impregnation is enhanced, but thermal stability of the sizing layer is reduced
Solution Approach 1:
The patent changes the chemical parameters of the sizing agent by using polyamic acid with specific molecular weight (5000-30000 g/mol) and controlling the molar ratio with alkali agent (0.01-0.2), which modifies the thermal stability and chemical restructuring behavior during high-temperature processing while maintaining impregnation quality
Solution Approach 2:
The patent creates a composite sizing agent system by combining polyamic acid with specific alkali agents (molecular weight 31-170 g/mol) in controlled ratios, forming a complex that exhibits both improved thermal stability and maintained impregnation properties through synergistic interaction between components
2Stability of the object's composition
If sizing agent composition undergoes thermal decomposition during high-temperature processing, then chemical restructuring occurs, but resin matrix impregnation and interlayer bonding strength are reduced
Solution Approach 1:
The patent applies preliminary stabilization by pre-forming a complex between polyamic acid and alkali agent before high-temperature processing, which prevents thermal decomposition and chemical restructuring during subsequent processing, thereby maintaining interlayer bonding strength
Solution Approach 2:
The patent uses a sizing agent composition that is designed to be consumed or transformed during processing, where the polyamic acid-alkali agent complex provides temporary protection and stabilization that is sacrificed during high-temperature processing to achieve the final composite structure
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 proposed sizing agent composition significantly enhances the thermal stability and emulsification stability of the sizing layer, leading to improved interlayer bonding strength and processing stability of carbon fiber composite materials.
Implementation Method 1
A complex formed from polyamic acid and the alkali agent can enhance the emulsification stability of polyamic acid
Implementation Method 2
during high-temperature processing of the carbon fibers covered with the sizing agent, thermal decomposition of the sizing agent composition or chemical restructuring of the sizing agent occurs
Data Source
AI summary
The present invention relates to a sizing agent composition, a sizing agent, a carbon fiber covered with the sizing agent, and a composite material. The sizing agent composition includes a polyamic acid and an alkali agent. The alkali agent has a specific molecular weight, and there is a specific molar ratio between the polyamic acid and the alkali agent, such that emulsification stability of the polyamic acid and thermal stability of a sizing layer consisting of the sizing agent are enhanced, thereby increasing interlayer bonding strength in the composite material that is made by the carbon fiber covered with the sizing agent.