Pressure Measurement Material Using Segmented Microcapsules
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Solution Overview
Problem
Conventional pressure measurement materials struggle to accurately detect pressure differences below 0.05 MPa due to insufficient color formation and density gradation, often resulting in unnecessary color formation during handling.
Innovation Solution
A material composition for pressure measurement featuring a color forming layer with microcapsules A encapsulating an electron-donating colorless dye precursor and microcapsules B not encapsulating the precursor, where the volume standard median diameters satisfy specific ratios and ranges, ensuring excellent color developability and suppressing color formation due to rubbing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitivity is increased to detect minute pressure below 0.05 MPa, then color formation and density gradation are improved, but color formation due to rubbing during handling occurs
Solution Approach 1:
The microcapsule population is segmented into two distinct groups: microcapsules A with smaller diameter (10-40 μm) that rupture at low pressure to provide sensitivity, and microcapsules B with larger diameter (40-150 μm) that remain intact during handling to prevent false color formation. This segmentation allows each group to fulfill a specific function in the pressure detection system.
Solution Approach 2:
Different regions of the microcapsule size distribution are assigned different functional qualities: smaller microcapsules A are optimized for pressure sensitivity and color formation at minute pressures, while larger microcapsules B are optimized for mechanical stability and resistance to rubbing during handling. This local quality differentiation resolves the contradiction between sensitivity and handling stability.
2Measurement precision
If conventional pressure measurement materials are used, then handling is simple, but accurate pressure measurement below 0.05 MPa cannot be achieved
Solution Approach 1:
The pressure-sensitive material uses a composite structure combining two types of microcapsules (A and B) with different size ranges and functions within a single coating layer. This composite approach enables both high measurement precision for minute pressures and maintains relative simplicity in application, as the dual-microcapsule system is integrated into a unified material composition rather than requiring separate components.
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 solution achieves effective color formation and density gradation at minute pressures below 0.05 MPa while minimizing unnecessary color formation, enabling precise pressure measurement and improved sensitivity.
Implementation Method 1
microcapsules A encapsulating an electron-donating colorless dye precursor and microcapsules B not encapsulating an electron-donating colorless dye precursor
Data Source
AI summary
Provided are a material for pressure measurement, including a color forming layer that contains microcapsules A encapsulating an electron-donating colorless dye precursor and microcapsules B not encapsulating an electron-donating colorless dye precursor, in which a volume standard median diameter D50A of the microcapsules A and a volume standard median diameter D50B of the microcapsules B satisfy Equation 1; a material composition for pressure measurement; and a material set for pressure measurement:D50A<D50B Equation 1.