Thixotropic Curable Silicone Composition for Optical Semiconductor Stability
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Solution Overview
Problem
Conventional curable silicone compositions have insufficient thixotropic properties, leading to flow issues and instability, especially when applied to optical semiconductors, and they also lack long-term storage stability.
Innovation Solution
A curable silicone composition comprising at least 65% by weight of curing reactive organopolysiloxane, 1-30% by weight of inorganic fillers such as silica or alumina, and additives like organopolysiloxanes with polyether structures, organosilane compounds, and organosiloxane oligomers with epoxy groups, which enhance morphological stability and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional curable silicone compositions are used, then the composition can be applied to optical semiconductors, but the composition flows and cannot maintain desired shape due to insufficient thixotropic property
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating specific thixotropic agents (colloidal silica, fumed silica, or aluminum oxide) at controlled concentrations (0.1-10 wt%, 1-30 wt%, or 1-5 wt% respectively) to enhance the composition's ability to maintain shape while controlling flow behavior during and after dispensing
Solution Approach 2:
The patent creates a composite curable silicone composition by combining base silicone components with thixotropic agents and crosslinking agents, forming a multi-component system that exhibits both shape-maintaining thixotropic properties and curable characteristics for optical semiconductor applications
2Duration of action of stationary object
If conventional curable silicone compositions are used, then the composition can be stored, but storage stability is insufficient leading to deterioration over time
Solution Approach 1:
The patent adjusts compositional parameters including the selection of stable base polymers, controlled crosslinking agent concentrations (0.01-5 wt%), and incorporation of stabilization mechanisms to extend storage stability while maintaining reliability for long-term shelf life requirements
3Shape
If the composition maintains high thixotropic property for shape stability, then shape is preserved, but viscosity may increase affecting dispensability
Solution Approach 1:
The patent utilizes thixotropic agents that provide time-dependent viscosity changes, allowing the composition to be easily dispensed when流动 is applied (low viscosity during dispensing) and then maintain stable shape after dispensing (high viscosity at rest), creating a dynamic viscosity profile that satisfies both requirements
Solution Approach 2:
The patent optimizes the concentration and type of thixotropic agents to achieve the right balance between shape stability and dispensability, using controlled amounts (0.1-10 wt% colloidal silica, 1-30 wt% fumed silica, or 1-5 wt% aluminum oxide) to prevent excessive viscosity while ensuring shape maintenance
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 shape effectively before and after curing at high temperatures, provides improved storage stability, and forms a cured product with enhanced transparency and adhesion, addressing flow and stability issues in optical semiconductor applications.
Implementation Method 1
High thixotropic curable silicone composition
Implementation Method 2
curable silicone composition comprising (A) at least one curing reactive organopolysiloxane
Implementation Method 3
1-30% by weight of inorganic fillers such as silica or alumina
Data Source
AI summary
A curable silicone composition comprising at least one curing reactive organopolysiloxane in an amount of 65% by weight or more relative to the total weight of the composition, at least one inorganic filler selected from silica, silica-titania composite oxide particle, and a combination thereof, in an amount of 1% by weight or more relative to the total weight of the composition, and at least one additive selected from (C1) organopolysiloxane having at least one organic functional group including at least one polyether structure at molecular side chain and/or molecular terminal; (C2) organosilane compound comprising at least one organic functional group selected from a C1-C6alkyl group, aryl group, and epoxy group, (C3) organopolysiloxane having at least one hydroxy group and at least one aryl group; (C4) organosiloxane oligomer having at least one epoxy group; (C5) unsaturated carboxylic acid or an ester thereof, and combinations thereof.