Friction Material Binder Using Solvent-Mixed Phenol Resin and Lignin
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Solution Overview
Problem
Conventional resin compositions for friction materials face issues with heat resistance and formability due to the inclusion of cellulose and poor compatibility between phenol resin and organosolv lignin, leading to environmental concerns and suboptimal performance.
Innovation Solution
A method involving polymer blending of phenol resin and lignin using solvent-mixing with organic solvents like methanol, ethanol, or tetrahydrofuran, followed by vacuum heat drying, to create a resin composition with improved heat resistance and formability, utilizing lignin with a weight average molecular weight of 5,000 or less and a softening point between 70°C to 180°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cellulose and drying oil are used in the resin composition, then environmental load is reduced, but heat resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing cellulose and drying oil with specific plant-derived materials (starch, protein, chitin) that have different thermal properties. This allows maintaining environmental benefits while achieving heat resistance comparable to conventional phenol resin formulations.
Solution Approach 2:
The patent creates a composite binder resin composition combining multiple plant-derived materials (starch, protein, chitin) with friction materials. This composite approach allows synergistic effects where the combination provides both environmental benefits and adequate heat resistance that individual materials cannot achieve alone.
2Object-affected harmful factors
If organosolv lignin is blended as a powder with phenol resin, then environmental load is reduced, but thermal fluidity deteriorates
Solution Approach 1:
The patent changes the physical state parameter of plant-derived materials from powder form to granular or flake form. This size modification improves thermal fluidity and processing characteristics while maintaining the environmental benefits of using plant-derived binders instead of conventional petroleum-based resins.
Solution Approach 2:
The patent introduces a coupling agent as an intermediary substance that facilitates the interaction between plant-derived materials and friction materials. This coupling agent improves thermal fluidity and bonding characteristics, enabling better processing while maintaining the environmental advantages of plant-derived binders.
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 resulting friction material exhibits enhanced formability and heat resistance while reducing environmental impact, maintaining friction performance equivalent to or exceeding conventional materials.
Implementation Method 1
solvent-mixing the phenol resin and the lignin with an organic solvent
Implementation Method 2
followed by vacuum heat drying
Implementation Method 3
vacuum heat drying
Data Source
AI summary
A resin composition for a friction material which is produced by a process including performing polymer blending of a phenol resin and a lignin; and a friction material including the resin composition. The resin composition for a friction material is useful as a binder in the friction material.