Photocurable Silicone Composition for Transparent, Thixotropic Cured Products
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Solution Overview
Problem
Existing photocurable silicone compositions face challenges in maintaining transparency while improving thixotropic properties, especially when inorganic fillers are added.
Innovation Solution
A photocurable silicone composition comprising an organopolysiloxane, a polysiloxane block copolymer with thiol groups, a photoinitiator, and an inorganic filler, where the polysiloxane block is bonded to an organo block via a specific linkage, ensuring excellent transparency and thixotropic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If inorganic filler is added to improve thixotropic property, then thixotropic property is improved, but transparency deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone resin system by incorporating specific ratios of phenyl groups and using polysiloxane block copolymers with thiol groups. This chemical parameter modification allows the formulation to achieve thixotropic properties through molecular structure design rather than relying on inorganic fillers, thereby maintaining optical transparency while obtaining the desired rheological properties.
Solution Approach 2:
The patent creates a composite silicone resin system combining organopolysiloxane with specific phenyl content and polysiloxane block copolymer with thiol groups. This composite approach achieves thixotropic behavior through the synergistic interaction of different polymer components, eliminating the need for inorganic fillers and preserving transparency.
2Ease of manufacture
If conventional photocurable silicone composition is used, then ease of manufacture is maintained, but thixotropic property deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters by specifying organopolysiloxane with 0.1-5.0 mass% phenyl groups and polysiloxane block copolymer with specific thiol group content. These parameter changes enable the composition to develop thixotropic properties while maintaining ease of manufacture through standard photocuring processes.
3Ease of manufacture
If other photocurable silicone compositions are used to improve transparency, then transparency is improved, but thixotropic property deteriorates
Solution Approach 1:
The patent formulates a composite system combining organopolysiloxane with controlled phenyl content and polysiloxane block copolymer containing thiol groups. This composite material design achieves both transparency and thixotropic properties simultaneously, overcoming the limitation of conventional compositions that prioritize transparency at the expense of thixotropic behavior.
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 excellent transparency and thixotropic properties, resulting in a cured product with improved mechanical strength and dimensional accuracy.
Implementation Method 1
photocurable silicone composition... a photoinitiator... irradiating the photocurable silicone composition with light
Data Source
AI summary
A UV-curable silicone composition is disclosed. The UV-curable silicone composition comprises: (A) an organopolysiloxane having at least two alkenyl groups and at least one aryl group in a molecule; (B) a polysiloxane block copolymer comprising: (i) a polysiloxane block and (ii) an organo block, wherein the polysiloxane block (i) is bonded to the organo block (ii) via a specific linkage, and wherein the polysiloxane block copolymer has at least two thiol groups in a molecule; (C) a photoinitiator; and (D) an inorganic filler. The composition exhibits excellent transparency even if an inorganic filler is added to improve thixotropic property.