Component-Mounting Substrate Coating for Peel and Scratch Resistance
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Solution Overview
Problem
The challenge of preventing electronic components from peeling off or falling off from substrates due to reduced adhesion caused by smaller sizes and heights, especially in high temperature and high humidity environments, and the need for improved abrasion and scratch resistance.
Innovation Solution
An electronic component-mounting substrate with a peeling or falling prevention layer and sheet that maintains a coefficient of static friction within specific ranges and has a controlled index Y, using a binder and filler composition to ensure adherence and smooth coating, thereby preventing component detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the protective layer is reduced to decrease substrate height, then the height of the electronic component-mounting substrate is reduced, but the adhesion between electronic components and substrate decreases causing components to peel off or fall off
Solution Approach 1:
The patent changes the physical and chemical parameters of the protective layer by controlling the product of BET specific surface area and content rate of filler within 0.01 to 15 mass%-m2/g, and controlling thickness A2 to be 5 to 300 μm. These parameter changes enable the layer to maintain adhesion while being thin enough to reduce overall substrate height.
Solution Approach 2:
The protective layer is formed as a composite material containing binder (A) and filler (B), where the filler has specific surface area and content rate within defined ranges. This composite structure provides both mechanical strength for adhesion and controlled thickness, resolving the contradiction between height reduction and adhesion maintenance.
2Ease of manufacture
If the thickness of the protective layer is reduced to reduce manufacturing costs, then the cost is reduced, but the abrasion resistance and scratch resistance of the substrate decreases
Solution Approach 1:
The patent optimizes the parameter combination of filler specific surface area, filler content rate, and layer thickness A2 to achieve the desired abrasion and scratch resistance at minimal thickness. By controlling the product of specific surface area and content rate within 0.01 to 15 mass%-m2/g, the layer achieves maximum protective efficiency per unit thickness, reducing material costs while maintaining strength.
Solution Approach 2:
The protective layer is designed with specific local properties through filler distribution and thickness control (A2 = 5 to 300 μm). The layer provides enhanced abrasion and scratch resistance exactly where needed on the substrate surface, allowing cost-effective protection without requiring uniform thick coverage throughout.
3Length of stationary object
If the thickness of the protective layer is reduced to minimize substrate height, then the substrate height is reduced, but the reliability in high temperature and high humidity environment deteriorates
Solution Approach 1:
The patent defines specific parameter ranges for the protective layer including thickness A2 (5 to 300 μm) and the product of filler specific surface area and content rate (0.01 to 15 mass%-m2/g). These parameter changes ensure the layer maintains sufficient adhesion strength and environmental stability even at reduced thickness, preventing component peeling in harsh high temperature and high humidity conditions.
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 provides a reliable substrate that prevents electronic components from peeling or falling off, even in harsh conditions, ensuring long-term durability and resistance to external damage.
Implementation Method 1
a rate of change X of a coefficient of static friction obtained in the following [Formula 1] is −50% or greater and 200% or smaller
Data Source
AI summary
An electronic component-mounting substrate including a peeling or falling prevention layer that has excellent adhesion and scratch resistance, can increase smoothness of corner parts of components after processing, and firmly covers a substrate and electronic components provided on the substrate, so that the electronic component-mounting substrate can prevent human nails or other components from getting caught between electronic components that are mounted during a process of mounting the electronic components, preventing the electronic components from peeling off or falling off from the substrate due to an external damage. The electronic component-mounting substrate includes a substrate, an electronic component, and a peeling or falling prevention layer, in which the peeling or falling prevention layer satisfies (1) a rate of change X of a coefficient of static friction is −50% or greater and 200% or smaller, and (2) an index Y is 0.8 or greater and 20.0 or smaller.