Curable Fluoropolyether Adhesive Composition for Optical Parts
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Solution Overview
Problem
Cured products from existing fluoropolyether adhesive compositions exhibit insufficient rubber strength, leading to cracks under external impact, while adding silica particles to improve impact resistance often results in reduced light transmittance.
Innovation Solution
A curable fluoropolyether adhesive composition incorporating sodium fluoride enhances rubber strength without significantly impairing light transmittance, comprising a linear polyfluoro compound, fluorine-containing organohydrogensiloxane, platinum group metal catalyst, organopolysiloxane, and sodium fluoride, optimized to achieve a cured product with good adhesive and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If spherical silica particles are added to improve impact resistance, then rubber strength is improved, but light transmittance is greatly reduced
Solution Approach 1:
The invention changes the particle size parameter of the filler from conventional silica (0.050-10 μm) to ultrafine aluminum oxide particles (0.003-0.020 μm). This parameter change allows the particles to be small enough to not significantly scatter light (maintaining transmittance) while still providing reinforcement to improve rubber strength and impact resistance.
Solution Approach 2:
The invention uses ultrafine aluminum oxide particles as a filler that provides reinforcement without the light scattering issues of larger silica particles. The specific particle size range (0.003-0.020 μm) is chosen to be just small enough to maintain optical clarity while still effectively strengthening the cured product.
2Ease of manufacture
If conventional adhesive compositions are used, then adhesive property is achieved, but rubber strength is insufficient causing cracks under external impact
Solution Approach 1:
The invention creates a composite adhesive composition by combining the base adhesive components (polyfluoro compound, organohydrogensiloxane, catalyst) with ultrafine aluminum oxide particles as a reinforcing filler. This composite structure provides both the adhesive properties of the base composition and the enhanced mechanical strength from the dispersed particulate reinforcement.
Solution Approach 2:
The invention changes the filler particle size to an ultrafine range (0.003-0.020 μm) that is small enough to not significantly impact optical properties but sufficient to provide mechanical reinforcement. This parameter optimization allows the filler to strengthen the material without causing light scattering.
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 provides a cured product with excellent rubber strength, good adhesive properties, and high light transmittance, making it suitable for optical components without compromising transparency.
Implementation Method 1
a platinum group metal-based catalyst... of a composition containing a predetermined component described later
Implementation Method 2
a curable fluoropolyether adhesive agent composition that gives a cured product having good light transmittance and good adhesive property and excellent rubber strength is obtained by using sodium fluoride as a component that improves rubber strength
Data Source
AI summary
This curable fluoropolyether adhesive composition contains specific amounts of (A) a straight-chain polyfluoro compound having two or more alkenyl groups per molecule, and having a perfluoropolyether structure in the main chain thereof, (B) a fluorine-containing organohydrogen siloxane having, per molecule, a perfluoroalkyl group, a perfluoro oxyalkyl group, a perfluoro alkylene group, or perfluoro oxyalkylene group, and two or more SiH groups, and not having an epoxy group or an alkoxy group directly bonded to a silicon atom, (C) sodium fluoride, (D) a platinum-group metal catalyst, and (E) an organopolysiloxane having, per molecule, a SiH group, a perfluoroalkyl group or a perfluoro oxyalkyl group, and an epoxy group and/or a trialkoxysilyl group. A cured product of the composition has good light transmission properties and good adhesion properties, and excellent rubber strength.