UV-Curable Organopolysiloxane Composition for Low Viscosity
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Solution Overview
Problem
Existing UV curable organopolysiloxane compositions have high viscosity, limiting their application in injection molding and inkjet printing due to restricted processing methods, and lack adjustability in mechanical properties for substrates.
Innovation Solution
A UV curable composition comprising 5-95 parts by mass of a compound with one or more acryloxy groups and 95-5 parts by mass of an organopolysiloxane without UV curable functional groups, specifically with three or more alkenyl groups or two or more alkenyl groups with a vinyl group content of 5% or more, achieving low viscosity and excellent workability without organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV curable organopolysiloxane compositions are used, then chemical stability and heat resistance are improved, but viscosity becomes high limiting processing methods
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific organopolysiloxane structures with controllable molecular weights and functional group densities. By adjusting the ratio of crosslinking agents and modifying the polysiloxane backbone structure, the composition achieves both high chemical stability and reduced viscosity, enabling diverse processing methods while maintaining reliability.
Solution Approach 2:
The patent creates a composite curable composition by combining UV curable organopolysiloxane with carefully selected additives and co-monomers. This composite approach allows the base polysiloxane to provide chemical stability while the added components reduce viscosity and improve processability, resolving the contradiction between reliability and ease of operation.
2Reliability
If UV curable organopolysiloxane compositions are used, then chemical stability is improved, but adaptability in processing methods deteriorates
Solution Approach 1:
The patent adjusts key parameters including molecular weight distribution, functional group content, and viscosity modifiers to enable the composition to be processed by multiple methods including injection molding and inkjet printing, while the crosslinking density and chemical structure are optimized to maintain high chemical stability across different processing routes.
Solution Approach 2:
The patent designs a universal curable composition that can be applied through multiple processing methods (injection molding, inkjet printing, coating, casting). The composition achieves multi-functionality by balancing viscosity for flowability, incorporating appropriate functional groups for crosslinking, and maintaining chemical stability, allowing it to adapt to various manufacturing processes.
3Reliability
If existing UV curable compositions are used, then curing functionality is achieved, but mechanical property adjustability deteriorates
Solution Approach 1:
The patent provides systematic parameter adjustment capabilities by varying the types and ratios of organopolysiloxane components, crosslinking agents, and additives. This allows independent optimization of mechanical properties (tensile strength, elongation, hardness, flexibility) while maintaining complete curing functionality through UV or electron beam irradiation, achieving both reliability and adaptability.
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 exhibits low viscosity, enabling easy application and adjustment of mechanical properties, suitable for substrates, and forms a cured product with excellent tensile elongation and flexibility, suitable for insulating coatings and flexible displays.
Implementation Method 1
UV curable composition curable by chemical rays (actinic rays), for example ultraviolet light
Data Source
AI summary
Provided is a UV curable composition containing a silicon atom, that allows easy adjustment of the mechanical properties of the molded product obtained by curing, and excellent workability when applied to a substrate, even as a solvent-free type. The UV curable composition comprises: (A) 5 to 95 parts by mass of a compound having one or more acryloxy group in a molecule; and (B) 95 to 5 parts by mass of one or more type of organopolysiloxane without a UV curable functional group selected from (B1) and (B2); (B1) organopolysiloxane having three or more alkenyl groups in one molecule and no UV curable functional groups; (B2) organopolysiloxane having two or more alkenyl groups in one molecule but not having a UV curable functional group. The composition is substantially free of organic solvents, and the viscosity of the entire-composition measured at 25° C. using an E-type viscometer is 500 mPa·s or less.