Resin Composite Material Graphite Dispersion
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Solution Overview
Problem
Conventional methods for dispersing graphite particles in resins, such as olefin-based resins, often result in aggregation due to low affinity, leading to insufficient impartation of characteristics like electrical conductivity and mechanical strength, and surface modification treatments can impair the properties of graphite particles.
Innovation Solution
The use of fine graphite particles obtained by mixing graphite with a specific aromatic vinyl copolymer and peroxyhydrate, followed by grinding, which are then added to polystyrene or polyphenylene ether, allowing for high dispersion and imparting rigidity and electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If graphite particles are simply mixed with olefin-based resin, then the resin can be easily manufactured, but the graphite particles aggregate and fail to impart sufficient electrical conductivity and mechanical properties
Solution Approach 1:
The patent introduces a silane-modified polyethylene graft copolymer as an intermediary substance between graphite particles and olefin-based resin. This graft copolymer contains both polyethylene chains (compatible with olefin resin) and silane groups (that interact with graphite surface), acting as a mediator to improve dispersion and impart electrical conductivity without complicating the manufacturing process
2Ease of manufacture
If graphite particles are simply mixed with olefin-based resin, then the manufacturing process remains simple, but the graphite particles aggregate and fail to impart sufficient mechanical strength
Solution Approach 1:
The silane-modified polyethylene graft copolymer serves as a mediator that improves the interfacial adhesion between graphite particles and olefin resin matrix. The graft copolymer's dual structure enables it to bridge the interface, resulting in better stress transfer and enhanced mechanical strength while maintaining simple manufacturing procedures
3Stability of the object's composition
If surface modification treatment is applied to graphite particles, then dispersion in resin is improved, but the electrical conductivity characteristics of graphite are impaired
Solution Approach 1:
The patent applies local quality modification by using a silane-modified polyethylene graft copolymer that provides different functional groups at different locations: the polyethylene portion interacts with the resin matrix for dispersion, while the silane groups interact with graphite surface. This localized functional distribution improves dispersion without uniformly modifying the graphite surface and impairing its electrical conductivity
Solution Approach 2:
The patent creates a composite system consisting of graphite particles, silane-modified polyethylene graft copolymer, and olefin-based resin. This composite approach allows the graft copolymer to provide dispersion functionality while the graphite particles maintain their intrinsic electrical conductivity, achieving both goals simultaneously
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 approach effectively disperses graphite particles in resins, enhancing their electrical conductivity and mechanical properties without impairing the characteristics, leading to improved performance in resin composite materials.
Implementation Method 1
an aromatic vinyl copolymer which is adsorbed on the plate-like graphite particles
Implementation Method 2
at least one hydrocarbon chain which is bonded to the aromatic vinyl copolymer, and which is selected from the group consisting of alkyl chains, oligoolefin chains, and polyolefin chains
Data Source
AI summary
A resin composite material includes: fine graphite particles including plate-like graphite particles, an aromatic vinyl copolymer which is adsorbed on the plate-like graphite particles, and which contains a vinyl aromatic monomer unit represented by the following formula (1):—(CH2—CHX)— (1)(in the formula (1), X represents a phenyl group, a naphthyl group, an anthracenyl group, or a pyrenyl group, provided that these groups may have each a substituent), and at least one hydrocarbon chain which is bonded to the aromatic vinyl copolymer, and which is selected from the group consisting of alkyl chains, oligoolefin chains, and polyolefin chains.