Temporary Fixative Composition for Electronic Component Stability
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Solution Overview
Problem
Existing temporary fixatives in the electronics field face issues with positional stability and wear during application due to flow and shear stress, leading to potential misalignment or detachment of electronic components during transport and processing.
Innovation Solution
A composition comprising 20-30% thermoplastic polymers, 45-69% organic solvent, 2-15% silica particles, 0.5-10% organic thickener, and 1-10% particulate inorganic filler, which provides high yield strength and minimal flow, ensuring positional stability and reducing tool wear during application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing temporary fixatives are used, then electronic components can be temporarily fixed, but the fixative flows under shear stress during application causing positional instability and tool wear
Solution Approach 1:
The patent modifies the rheological parameters of the fixative composition by incorporating specific additives and adjusting the formulation to achieve yield stress behavior. This changes the flow characteristics from Newtonian to non-Newtonian, allowing the fixative to remain stable at rest while still being applicably dispensable, thereby resolving the contradiction between positional stability and tool wear during application
Solution Approach 2:
The invention creates a composite fixative material combining multiple components including polymers, solvents, and rheology modifiers. This composite structure provides both the adhesion properties needed for temporary fixation and the controlled flow properties needed to minimize tool wear and maintain positional stability during and after application
2Ease of operation
If the fixative has high flowability for easy application, then application process is simplified, but positional stability during transport deteriorates
Solution Approach 1:
The fixative exhibits dynamic rheological properties where its flow behavior changes based on applied stress. During application, shear thinning allows easy flow and dispensing, but once applied and at rest, the yield stress prevents flow and maintains positional stability. This dynamic behavior resolves the contradiction between ease of application and transport stability
3Strength
If the fixative is applied to ensure strong adhesion, then temporary fixing strength is improved, but tool wear during application increases
Solution Approach 1:
The patent adjusts the rheological parameters of the fixative to achieve yield stress behavior, which allows the material to be dispensed with reduced shear stress (minimizing tool wear) while maintaining sufficient adhesion strength once applied. The yield stress ensures the fixative sets in place without requiring excessive application force, thereby resolving the contradiction between adhesion strength and tool wear
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 composition maintains dimensional and positional stability, reduces tool wear, and prevents surface damage, enhancing process reliability and allowing for effective temporary fixing of electronic components and preforms before heat treatment.
Implementation Method 1
The composition comprises (B) 45% to 69% by weight, preferably 50% to 65% by weight, of organic solvent
Implementation Method 2
The thermoplastic polymer(s) can have a glass transition temperature for example in the range from 40 to 100° C.
Implementation Method 3
The composition comprises (D) 0.5% to 10% by weight, preferably 1% to 4% by weight, of organic thickener
Data Source
AI summary
A composition consisting of:(A) 20% to 30% by weight of one or more thermoplastic polymers,(B) 45% to 69% by weight of organic solvent,(C) 2% to 15% by weight of silica particles,(D) 0.5% to 10% by weight of organic thickener,(E) 1% to 10% by weight of particulate inorganic filler having a Mohs hardness in the range from 1 to 8, and(F) 0% to 1% by weight of one or more constituents other than constituents (A) to (E).