Open-Cell Silicone Foam for Bubble-Free Temporary Fixing
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Solution Overview
Problem
Existing temporary fixing materials, such as pressure-sensitive adhesive tapes, face issues with bubble inclusion, high peel strength leading to adhesive residue, and reduced adsorptivity when exposed to water, which hinders their use in applications like electronics manufacturing where high accuracy and repeatability are required.
Innovation Solution
A temporary fixing material with a silicone foam layer having an open-cell structure, formed by thermal curing of a silicone resin composition, which includes organopolysiloxanes, water, inorganic thickeners, surfactants, and a hydrosilylation reaction catalyst, ensuring low peel strength, high shear adhesive strength, and excellent bubble removability, allowing for bubble-free bonding and easy water washability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure-sensitive adhesive tape is used for temporary fixing, then bonding strength is improved, but adhesive residue remains after peeling and bubbles are included during bonding
Solution Approach 1:
The patent employs a foam material with an open-cell structure as the temporary fixing member. The porous structure allows air to escape during bonding, preventing bubble inclusion, while the foam's mechanical properties provide adequate bonding strength without leaving adhesive residue upon removal.
Solution Approach 2:
The patent extracts the adhesive layer from the temporary fixing member, eliminating the source of adhesive residue. Instead of using a traditional pressure-sensitive adhesive tape, the invention relies on the foam material's inherent friction and mechanical interlocking properties to provide temporary fixing without any adhesive substance.
2Ease of operation
If a foam sheet with emulsion-based material is used, then repeelability is improved, but water resistance deteriorates causing swelling and reduced adsorptivity
Solution Approach 1:
The patent changes the material parameter from emulsion-based to silicone-based foam, which fundamentally alters the material's interaction with water. The silicone foam maintains its dimensional stability and adsorptivity in wet conditions while preserving ease of peeling, thus resolving the contradiction between repeelability and water resistance.
3Productivity
If heating at high temperature is used in production process, then film formation is improved, but peel strength increases causing adhesive residue or substrate breakage
Solution Approach 1:
The patent employs a disposable foam temporary fixing member that is designed to be removed easily after serving its purpose. The foam material provides sufficient bonding during the high-temperature film formation process but is intentionally designed with low residual adhesion to ensure clean removal without damaging the substrate or leaving residue.
4Temperature
If a silicone foam with high closed-cell ratio is used, then heat resistance is improved, but bubble removability deteriorates and surface becomes rough
Solution Approach 1:
The patent specifically selects a foam material with an open-cell structure rather than a closed-cell structure. The open cells create continuous pathways that allow trapped air to escape during the bonding process, preventing bubble inclusion. The open-cell structure also maintains a smooth surface while providing adequate heat resistance for the application.
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 prevents bubble inclusion, maintains adhesion at various temperatures, peels without residue, and restores adsorptivity after water washing, enabling repeated use and ensuring high accuracy in applications like electronics manufacturing.
Implementation Method 1
A foam sheet having adsorptivity has heretofore been used as, for example, a sheet for preventing the overturning or slippage of furniture or home electric appliances
Implementation Method 2
A temporary fixing material with a silicone foam layer having an open-cell structure, formed by thermal curing of a silicone resin composition
Implementation Method 3
a hydrosilylation reaction catalyst
Data Source
AI summary
Provided is an adsorption temporary fixing material having the following features: an adherend can be bonded and temporarily fixed to the material while the inclusion of bubbles is prevented; the material hardly peels from a specified position at both high and low temperatures; the material can be peeled without any adhesive residue when the temporary fixing is released; and even when the material is contaminated, its adsorptivity is restored by water washing, and hence the material can be repeatedly used. The adsorption temporary fixing material of the present invention is an adsorption temporary fixing sheet including a foam layer having an open-cell structure, wherein the adsorption temporary fixing material includes the foam layer in the entirety of the sheet or on at least one surface thereof, wherein a shear adhesive strength of a surface of the foam layer with a SUS304BA plate at 23°C is 1 N/100 mm2 or more at a tensile rate of 50 mm/min, wherein a peel strength of the surface of the foam layer from the SUS304BA plate at 23°C is 1 N/20 mm or less at a peel angle of 180° and a tensile rate of 300 mm/min, and wherein a weight change ratio after the adsorption temporary fixing sheet has been immersed in distilled water for 1 minute and then water droplets have been wiped off the surface thereof is 50% or less.