Keyboard Key Material Using Moisture Control Particles
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Solution Overview
Problem
Keyboard musical instrument keys made from acrylic resin are slippery at high humidity, leading to unsuitable performance conditions and prone to staining, while alternatives like natural ivory are environmentally unsustainable.
Innovation Solution
A material comprising a base resin and moisture control particles that absorb and desorb moisture, maintaining a non-slippery surface and preventing stains, with a friction coefficient range of 0.21 to 0.26 at 30% to 90% relative humidity, using a polymer with ionizable functional groups and a condensation inhibitor to control condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylic resin is used for keyboard instrument keys, then the keys are durable and easy to manufacture, but the surface becomes slippery at high humidity
Solution Approach 1:
The patent combines acrylic resin with inorganic porous particles (such as silica gel, alumina, or titania) to create a composite material. The inorganic particles remain exposed on the surface and provide hygroscopicity, allowing them to absorb moisture and maintain a non-slippery surface even when the base acrylic resin remains hydrophobic. This composite approach preserves the durability of acrylic resin while adding the desired surface grip through the hygroscopic inorganic components.
2Ease of operation
If inorganic porous material is mixed to resin to increase hygroscopicity, then the key surface absorbs moisture to provide dry-feeling, but the porous material may absorb stain over time
Solution Approach 1:
The patent creates a surface layer with different properties from the bulk material. The inorganic porous particles are concentrated on the surface where they provide moisture absorption, while the bulk acrylic resin maintains its stain-resistant properties. By controlling the particle size, distribution, and surface exposure, the patent achieves localized hygroscopic functionality at the surface without compromising the overall stain resistance of the key material.
Solution Approach 2:
The patent utilizes inorganic porous particles with controlled pore structures that preferentially absorb water vapor from the air through hygroscopicity. The porous structure provides high surface area for moisture absorption while the inorganic nature of the particles (such as silica gel, alumina, or titania) makes them resistant to staining from common substances like sweat, oils, and cosmetics that would otherwise be absorbed by organic porous materials.
3Ease of operation
If natural ivory is used for keyboard instrument keys, then the surface provides excellent grip and feel, but environmental protection is compromised
Solution Approach 1:
The patent creates an artificial material that replicates the hygroscopic surface properties of natural ivory without using animal products. By incorporating hygroscopic inorganic particles into acrylic resin, the patent mimics the moisture-absorbing capability and tactile feel of ivory, providing a similar playing experience while being environmentally sustainable and ethically acceptable.
Solution Approach 2:
The patent changes the chemical composition and surface properties of synthetic materials to match or exceed the performance of natural ivory. By adjusting the type, amount, and surface characteristics of inorganic porous particles, the patent can tune the hygroscopicity, surface friction, and tactile properties to replicate the desirable characteristics of ivory while maintaining the advantages of synthetic materials such as durability and environmental sustainability.
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 material provides a stable, non-slippery, and stain-resistant surface for keyboard instrument keys, maintaining performance consistency across humidity levels and extending usage without becoming sticky or slippery.
Implementation Method 1
particles of a moisture control material that performs chemical sorption of moisture
Implementation Method 2
The moisture control material increase in volume with moisture-sorption. The moisture control material decrease in volume with moisture-desorption
Implementation Method 3
a condensation inhibitor that inhibits or controls condensation of the particles of the moisture control material during production process
Data Source
AI summary
A material for a key of a keyboard instrument may include, but is not limited to, a base resin; and particles of a moisture control material that performs chemical sorption of moisture. The moisture control material increase in volume with moisture-sorption. The moisture control material decrease in volume with moisture-desorption.