Silicone Release Coating Composition for Structural Composites
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Solution Overview
Problem
The structural composites industry requires a release liner with high immediate release force that is economical, low in solvent or solventless, and not hazardous, as existing solutions like organofunctional epoxy silicone polymers or solvent-based coatings are either expensive or have insufficient release force.
Innovation Solution
A silicone release coating composition comprising a polydiorganosiloxane, a polyorganohydrogensiloxane crosslinker, a hydrosilylation reaction catalyst, and an inhibitor, applied to a substrate to form a transfer liner with high immediate release force, suitable for use in the manufacture of structural composites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If organofunctional epoxy silicone polymers requiring radiation cure are used, then release force is improved, but cost increases and process complexity increases
Solution Approach 1:
The patent changes the chemical composition parameters by using polydiorganosiloxane with specific alkaryl groups (30-95 weight %) combined with polyorganohydrogensiloxane crosslinker, enabling cure through conventional thermal or moisture curing instead of expensive radiation curing, thereby maintaining high release force while reducing manufacturing cost
Solution Approach 2:
The patent employs a disposable release liner design where the liner is used once and then discarded, eliminating the need for expensive and complex reconditioning processes. The coating is applied to a substrate that serves its purpose immediately and is then discarded with the cured coating, simplifying the overall manufacturing process
2Ease of operation
If solvent based release coating compositions are used, then ease of application is improved, but safety deteriorates and environmental harm increases
Solution Approach 1:
The patent creates an inert, solvent-free environment by using 100% solid silicone coating composition that cures through moisture or thermal processes. This eliminates flammable solvents from the application process, ensuring worker safety and environmental protection while maintaining ease of application through simple coating methods
Solution Approach 2:
The patent extracts and removes all solvent components from the release coating composition, using only pure silicone polymers and crosslinkers. This extraction of harmful substances eliminates safety hazards and environmental damage associated with solvent-based coatings while preserving the coating's applicability
3Ease of manufacture
If conventional silicone release coatings are used, then cost is reduced, but release force is insufficient
Solution Approach 1:
The patent creates a composite coating system by combining polydiorganosiloxane (providing base silicone properties) with polyorganohydrogensiloxane crosslinker (providing additional strength and release characteristics). This composite approach achieves superior immediate release force compared to conventional single-component coatings while remaining cost-effective through conventional curing processes
Solution Approach 2:
The patent utilizes the specific molecular structure and curvature characteristics of alkaryl groups in the polydiorganosiloxane, where the aromatic ring structures provide optimal geometric configuration for achieving high immediate release force. The specific spatial arrangement of these groups creates the necessary surface properties for enhanced release performance
4Force
If release liners are designed for immediate release, then release force is improved, but reusability deteriorates
Solution Approach 1:
The patent creates a dynamic release liner system where the coating can be removed and reapplied to the substrate multiple times. The crosslinked silicone coating maintains its structural integrity and release properties through repeated cycles of application, curing, and removal, enabling the liner to be reused several times while consistently providing high immediate release force
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 silicone release coating composition provides a high immediate release force, making it suitable for use in the structural composites industry, particularly in the manufacture of aircraft parts, while being economical and reducing solvent usage.
Implementation Method 1
A silicone release coating composition comprises: A) a polydiorganosiloxane, B) a polyorganohydrogensiloxane crosslinker, C) a hydrosilylation reaction catalyst, and D) a hydrosilylation reaction inhibitor
Data Source
AI summary
A silicone release coating composition and method for its preparation and use are described. A release coating prepared by curing the silicone release coating composition has high immediate release force (>50 g/in). A release liner including the release coating is suitable for use as a transfer liner in processes for making composites articles, such as aircraft parts.