Silicone Rubber Composition for Wearable Durability
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Solution Overview
Problem
The existing silicone rubber compositions have limitations in mechanical strength and bending durability, as identified in Patent Document 1.
Innovation Solution
A silicone rubber-based curable composition is developed, incorporating a vinyl group-containing polyorganosiloxane and an inorganic filler, such as silica particles, with controlled vinyl group index and filler content to enhance mechanical strength and bending durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the vinyl group content in silicone rubber composition is increased to improve crosslinking and mechanical strength, then mechanical strength is improved, but bending durability deteriorates due to excessive crosslinking density
Solution Approach 1:
The patent applies parameter changes by precisely controlling the vinyl group index to 0.35% by mole or less and the inorganic filler content to 5-60 parts by weight per 100 parts by weight of organopolysiloxane. This optimization of compositional parameters achieves a balanced crosslinking density that simultaneously improves mechanical strength and bending durability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent uses composite materials by combining vinyl group-containing organopolysiloxane with specific inorganic fillers (such as silica particles) in controlled amounts. This composite approach allows the material to achieve both high mechanical strength through crosslinking and good bending durability through the filler's ability to reduce excessive crosslinking density and improve flexibility.
2Strength
If inorganic filler content is increased to improve mechanical strength, then mechanical strength is improved, but ease of deformation deteriorates
Solution Approach 1:
The patent optimizes the inorganic filler content parameter to a specific range of 5-60 parts by weight per 100 parts by weight of organopolysiloxane. This controlled parameter adjustment ensures sufficient mechanical strength enhancement while preventing excessive filler content that would compromise ease of deformation and flexibility of the cured product.
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 achieves improved mechanical strength and bending durability in molded products, making it suitable for applications requiring flexibility and durability, such as wearable devices.
Implementation Method 1
a vinyl group-containing polyorganosiloxane (A)... a vinyl group index in the silicone rubber-based curable composition is equal to or less than 3.5×10−1% by mole
Implementation Method 2
an inorganic filler including silica particles (C)... a content of the inorganic filler is equal to or more than 5 parts by weight and equal to or less than 60 parts by weight with respect to 100 parts by weight of the organopolysiloxane
Data Source
AI summary
A silicone rubber-based curable composition according to the present invention includes an organopolysiloxane including a vinyl group-containing organopolysiloxane (A), and an inorganic filler including silica particles (C), in which in a 1H-NMR spectrum of the silicone rubber-based curable composition, a first peak derived from a vinyl group is present, a vinyl group index is equal to or less than 3.5×10−1% by mole, and a content of the inorganic filler satisfies a range of equal to or more than 5 parts by weight and equal to or less than 60 parts by weight with respect to 100 parts by weight of the organopolysiloxane.