Sizing agent composition, carbon fiber material and composite material
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Solution Overview
Problem
Conventional sizing agents for carbon fibers suffer from high hygroscopicity and dimensional change ratios, leading to poor storage stability and adhesiveness, which negatively impact the bonding properties between carbon fibers and resin matrices.
Innovation Solution
A sizing agent composition comprising an epoxy compound, a dicyclopentadiene compound, a surfactant, and water, with specific weight ratios and structures, is applied to the carbon fibers to reduce hygroscopicity and dimensional change ratios, enhancing bonding properties with the resin matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional sizing agents containing ethylene oxide segment or ester groups are used to improve water solubility and film-forming properties, then the carbon fiber material achieves good dispersity in water and protective thin film formation, but moisture in the air is easily absorbed, enhancing adhesiveness between bundles and inducing defects
Solution Approach 1:
The patent changes the chemical composition parameters of the sizing agent by using epoxy compounds with specific epoxy equivalents (100-1500 g/eq) and dicyclopentadiene compounds with specific structural parameters, replacing conventional ethylene oxide segment-containing resins to achieve lower hygroscopicity while maintaining film-forming properties
Solution Approach 2:
The patent creates a composite sizing agent system combining epoxy compounds and dicyclopentadiene compounds in specific weight ratios (2-30 parts epoxy to 2-30 parts dicyclopentadiene), where the synergistic interaction between these two compound types provides both protective film formation and reduced moisture absorption
2Strength
If polyurethane resin is mixed with epoxy resin to improve strand integrity and inhibit hairiness, then the film formed enhances strand integrity, but the film exhibits defects of age hardening
Solution Approach 1:
The patent replaces polyurethane resin with a specific epoxy-dicyclopentadiene compound combination that provides equivalent or superior strand integrity protection without the age hardening defect, effectively substituting a problematic material with a more reliable alternative
Solution Approach 2:
The patent modifies the chemical structure parameters by selecting epoxy compounds with specific epoxy equivalents and dicyclopentadiene compounds with specific structural features, creating a film with improved long-term stability and resistance to age hardening while maintaining strand integrity
3Stability of the object's composition
If sizing agent composition is optimized to reduce hygroscopicity and dimensional change ratio, then storage stability and operability are improved, but bonding properties with resin matrix must be maintained or enhanced
Solution Approach 1:
The patent designs the sizing agent to perform multiple functions simultaneously: the epoxy compound provides both protective film formation with low hygroscopicity and bonding compatibility with resin matrices, while the dicyclopentadiene compound contributes to both dimensional stability and adhesion enhancement, creating a multi-functional sizing system
Solution Approach 2:
The patent optimizes the weight ratio parameters of epoxy compound to dicyclopentadiene compound (both 2-30 parts by weight), and controls the surfactant content (0.5-15 parts by weight) to achieve the right balance between reducing hygroscopicity/maintaining dimensional stability and ensuring adequate bonding properties with resin matrices
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 lowers hygroscopicity and dimensional change ratios, improving the operability and bonding properties of carbon fibers with the resin matrix, resulting in enhanced mechanical properties and stability of composite materials.
Implementation Method 1
a surfactant and water. Based on an amount of sizing agent composition as 100 parts by weight, an amount of the epoxy compound is 2 parts by weight to 30 parts by weight, an amount of the dicyclopentadiene compound is 2 parts by weight to 30 parts by weight, an amount of the surfactant is 0.5 parts by weight to 15 parts by weight
Data Source
AI summary
The present application relates to a sizing agent composition, a carbon fiber material and a composite material. The sizing agent composition comprises specific compositions, thereby producing a sizing agent having emulsion droplets with specific diameter. The sizing agent has excellent emulsion stability, and it can efficiently improve hygroscopicity and dimensional stability of the carbon fiber material. Besides, the sizing agent can improve bonding properties between the carbon fiber material and resin matrix, therefore enhancing properties of the composite material.