Pressure Measurement Material with Microcapsule Thickness Ratio
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Solution Overview
Problem
Conventional pressure-sensitive copying sheets are not suitable for measuring minute local pressures or weak surface pressures below 3 MPa, as they require high-pressure conditions to form color, leading to inaccurate pressure measurement and reading issues.
Innovation Solution
A pressure measurement material using a plastic substrate with a color forming agent layer containing a colorless electron-donating dye precursor and a color developing agent layer with a metal salt of salicylic acid, where the microcapsule encapsulating the dye precursor has a specific thickness-to-diameter ratio, enabling color formation at low pressures and improving reading accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure-sensitive copying sheets are used, then high line pressure measurement is achieved, but minute local pressure or weak surface pressure below 3 MPa cannot be measured
Solution Approach 1:
The patent changes the chemical parameters of the color forming system by using specific electron-accepting compounds (metal salts of salicylic acid or its derivatives) and electron-donating dye precursors with extended conjugated systems. This chemical parameter change enables the system to respond to lower pressure thresholds (3 MPa or less) while maintaining measurement precision across a broader pressure range
Solution Approach 2:
The patent creates a composite pressure-sensitive material combining multiple components: electron-accepting compounds (metal salts of salicylic acid), electron-donating dye precursors, and polyurea resin/polyurethane resin wall membranes. This composite structure enables both high line pressure measurement and minute surface pressure measurement below 3 MPa, resolving the contradiction between measurement precision and pressure range adaptability
2Ease of manufacture
If high-pressure conditions are used to form color, then color formation is achieved, but accurate measurement of weak surface pressure below 3 MPa is not possible
Solution Approach 1:
The patent modifies the chemical reactivity parameters by selecting electron-accepting compounds with appropriate electron affinity and electron-donating dye precursors with extended conjugated systems. This parameter optimization allows color formation to occur at lower pressure thresholds (3 MPa or less) while maintaining sufficient color intensity for accurate measurement, eliminating the need for high-pressure conditions
3Ease of manufacture
If conventional color forming reaction is used, then color formation occurs, but reading accuracy and fine density analysis are degraded
Solution Approach 1:
The patent optimizes the color forming reaction parameters by using electron-accepting compounds (metal salts of salicylic acid) that produce intense coloration and electron-donating dye precursors with extended conjugated systems that enhance color density. This parameter optimization ensures that even weak surface pressures below 3 MPa produce sufficient color intensity for accurate scanning and fine density analysis, resolving the contradiction between color formation ease and reading accuracy
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 effectively forms color and enhances reading accuracy at pressures of 3 MPa or less, allowing for precise measurement of pressure distribution, particularly in applications requiring fine density analysis.
Implementation Method 1
forming a color utilizing a color forming reaction between the colorless electron-donating dye precursor and the electron-accepting compound
Data Source
AI summary
A material for pressure measurement is provided, the material having a substrate made of plastic, a color forming agent layer containing a colorless electron-donating dye precursor and a color developing agent layer containing an electron-accepting compound, the material for pressure measurement forming a color utilizing a color forming reaction between the colorless electron-donating dye precursor and the electron-accepting compound, wherein the colorless electron-donating dye precursor is included in a microcapsule containing an urethane bond, wherein at least one kind of the electron-accepting compound is a metal salt of salicylic acid having a substituent, and wherein the microcapsule satisfies a relation δ/D=from 1.0×10−3 to 2.0×10−2, where δ is a number-average wall thickness (μm) of the microcapsules, and D is a median diameter (μm) of microcapsules on a volume basis.