Silicone Release Coating Adhesion via Organopolysiloxane Additives
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Solution Overview
Problem
Existing silicone release coatings on flexible supports, such as paper or synthetic polymer films, face challenges with mediocre adhesion characteristics and high extractable compounds, especially at high-speed coating and crosslinking conditions, which affect their mechanical and release properties.
Innovation Solution
An aqueous silicone emulsion crosslinked by polyaddition reactions, incorporating a specific organopolysiloxane additive with epoxy and hydrosiloxyl units, is applied to the support, enhancing adhesion and crosslinking kinetics while maintaining a low amount of extractable compounds, thereby improving mechanical and release properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed coating and crosslinking conditions are used to increase productivity, then coating speed and output are improved, but adhesion characteristics deteriorate and extractable compounds increase
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone formulation by incorporating specific adhesion promoters and optimizing the ratio of crosslinking agents to control crosslinking kinetics, enabling fast coating speeds while maintaining adhesion quality
Solution Approach 2:
The patent introduces adhesion promoter substances as intermediary components that mediate between the silicone coating and the support surface, facilitating strong bonding even under high-speed processing conditions where contact time is limited
2Productivity
If high-speed coating and crosslinking conditions are used to increase productivity, then coating speed is improved, but the amount of extractable compounds increases
Solution Approach 1:
The patent optimizes the formulation parameters including the types and amounts of crosslinking agents and catalysts to achieve complete crosslinking at high speeds, minimizing residual extractable compounds while maintaining high productivity
Solution Approach 2:
The patent ensures continuous and complete crosslinking reaction through optimized formulation and processing conditions, preventing the formation of extractable compounds even during rapid high-speed coating operations
3Device complexity
If conventional silicone formulations are used to maintain simplicity, then formulation complexity is reduced, but adhesion and mechanical properties deteriorate
Solution Approach 1:
The patent creates a composite silicone formulation combining base silicone polymers with adhesion promoters, crosslinking agents, and functional additives to achieve superior mechanical properties and adhesion while maintaining practical formulation simplicity
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 solution achieves improved adhesion, mechanical strength, and reduced extractable compounds, ensuring effective release and durability of the silicone coating even under severe humidity and temperature conditions, with excellent resistance to abrasion and prolonged storage stability.
Implementation Method 1
An aqueous silicone emulsion crosslinked by polyaddition reactions, incorporating a specific organopolysiloxane additive with epoxy and hydrosiloxyl units
Implementation Method 2
after removal of the aqueous phase which is usually carried out by heating while maintaining the ambient temperature between 80° C. and 220° C.
Implementation Method 3
incorporating a specific organopolysiloxane additive with epoxy and hydrosiloxyl units, is applied to the support, enhancing adhesion and crosslinking kinetics
Data Source
AI summary
The field of the invention is that of the preparation of release and water-repellent coatings on a support, preferably a flexible support, such as a support made of paper or of synthetic polymer film, preferably of the polyolefin, polypropylene, polyethylene or polyester type. The release coatings taken into consideration are more especially those based on silicone elastomer crosslinked after coating on these supports.