Resin Composite Material with Silane-Modified Graphite
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Solution Overview
Problem
Conventional resin composite materials with graphite particles face challenges in achieving sufficient dispersion, leading to inadequate expression of graphite characteristics such as thermal conductivity and mechanical strength, often resulting in hard and brittle molded articles.
Innovation Solution
A resin composite material comprising fine plate-like graphite particles treated with a specific aromatic vinyl copolymer and a peroxyhydrate, combined with a fibrous inorganic filler, which improves dispersion and enhances thermal and electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If graphite particles are added to resin to improve thermal conductivity and mechanical strength, then the characteristics of graphite particles can be imparted to the resin, but the graphite particles aggregate and have low affinity for resins, resulting in insufficient expression of characteristics
Solution Approach 1:
The patent uses silane-modified graphite particles as an intermediary substance. The silane modification creates a surface layer on the graphite particles that improves affinity with the resin matrix, acting as a mediator between the graphite particles and resin. This allows the graphite particles to disperse uniformly without aggregation while maintaining their mechanical strength-enhancing characteristics.
Solution Approach 2:
The patent changes the surface chemical parameters of graphite particles through silane modification. By introducing silane groups on the graphite surface, the surface energy and chemical reactivity are altered, enabling better compatibility with the resin matrix and preventing aggregation, thus achieving uniform dispersion while maintaining structural integrity.
2Reliability
If a large amount of graphite particles are added for sufficient expression of characteristics, then thermal conductivity and electrical conductivity improve, but the molded article becomes hard and brittle
Solution Approach 1:
The patent changes the surface parameters of graphite particles through silane modification, which improves dispersion and allows effective use of smaller amounts of graphite particles. This surface modification enables achieving sufficient electrical conductivity with reduced graphite content, thereby avoiding the brittleness and hardness issues associated with high graphite loading.
Solution Approach 2:
The silane modification creates local quality changes on the graphite particle surfaces, creating regions with improved resin compatibility. This allows graphite particles to be evenly distributed throughout the resin matrix, creating localized conductive pathways that achieve sufficient electrical conductivity without requiring high overall graphite content, thus maintaining impact resistance.
3Stability of the object's composition
If surface modification treatment is applied to graphite particles to improve dispersion, then the graphite particles are highly dispersed in the resin, but the characteristics (in particular, electrical conductivity) of the graphite particles are impaired
Solution Approach 1:
The patent carefully controls the parameters of surface modification by using silane treatment with specific conditions. The silane modification is applied in a controlled manner to achieve sufficient dispersion improvement while minimizing the impact on electrical conductivity. The modification level is optimized to balance dispersion and conductivity requirements.
Solution Approach 2:
The silane modification creates local quality changes only on the surface of graphite particles, leaving the bulk properties intact. This surface-only modification approach improves dispersion through enhanced surface compatibility while preserving the intrinsic electrical conductivity of the graphite core, thus resolving the contradiction between dispersion and conductivity.
4Strength
If conventional resin composite materials with graphite particles are used, then the material has basic mechanical properties, but the graphite particles are dispersed in an aggregated state, making it difficult to express characteristics sufficiently
Solution Approach 1:
The silane-modified graphite particles act as an intermediary that bridges the gap between graphite and resin compatibility. The silane surface layer serves as a mediator that prevents aggregation and promotes uniform distribution throughout the resin matrix, achieving homogeneous shape and structure while maintaining mechanical strength characteristics.
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 combination of fine graphite particles and fibrous inorganic fillers in the resin composite material achieves high thermal conductivity and elastic modulus, while reducing electrical resistance, making it suitable for applications requiring efficient heat and electrical conduction.
Implementation Method 1
an aromatic vinyl copolymer which is adsorbed on the plate-like graphite particles
Implementation Method 2
excellent thermal conductivity and high elastic modulus can be imparted to a resin matrix by adding, to the resin matrix, a combination of a fibrous inorganic filler with fine graphite particles
Implementation Method 3
making it suitable for applications requiring efficient heat and electrical conduction
Data Source
AI summary
A resin composite material including fine graphite particles including plate-like graphite particles, an aromatic vinyl copolymer which is adsorbed on the plate-like graphite particles and which has a vinyl aromatic monomer unit represented by the following formula: —(CH2—CHX)— (X represents a phenyl group, a naphthyl group, an anthracenyl group, or a pyrenyl group, provided that these groups may have substituents); a fibrous inorganic filler; and a resin matrix.