One-Part Silicone Emulsion Coating Process for Substrates
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Solution Overview
Problem
Current two-part emulsion systems for silicone release coatings face challenges such as loss of reactive groups, variable vinylsiloxane to hydrogensiloxane ratio, complex and costly particle size control, high transportation costs due to large water usage, and limited flexibility in coating properties, leading to inconsistent coating performance and increased costs.
Innovation Solution
A one-part emulsion process where the reactive silicone-based composition is mixed and then emulsified in-line with the coating process, using simple equipment and polyvinyl alcohol polymers as emulsifiers, allowing for controlled bath-life and reactivity, reducing the need for frost-free storage and minimizing water usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-part emulsion systems are used to maintain storage stability, then the emulsions can be stored and transported, but the reactive groups are lost during storage and the vinylsiloxane to hydrogensiloxane ratio becomes variable
Solution Approach 1:
The system separates the emulsion into two distinct parts: Part A containing the silicone composition and Part B containing water and emulsifier. This segmentation allows Part A to maintain its reactive groups without degradation during storage, while Part B remains stable separately. The two parts are mixed immediately before application, ensuring consistent reactive group availability and precise vinylsiloxane to hydrogensiloxane ratio control.
2Manufacturing precision
If complex particle size control equipment is used to achieve sufficient coating performance, then the coating quality improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention replaces expensive, complex particle size control equipment with simple, inexpensive mixing apparatus. The emulsion is designed to achieve sufficient coating performance through adequate mixing rather than through sophisticated particle size control equipment, thereby reducing manufacturing complexity and cost while maintaining acceptable coating quality.
3Ease of operation
If large amounts of water are used in the emulsion to enable simple application, then the application process is simplified, but the transportation costs increase and frost-free storage is required
Solution Approach 1:
The system divides the emulsion into two separate parts that can be stored and transported independently. Part A contains the silicone composition with minimal or no water, while Part B contains the water and emulsifier. This segmentation reduces the total water content that needs to be transported and stored under frost-free conditions, while still enabling simple application when the two parts are mixed before use.
4Manufacturing precision
If the vinylsiloxane to hydrogensiloxane ratio is adjusted to optimize coating properties, then the coating performance improves, but the emulsion formulation flexibility is limited in two-part systems
Solution Approach 1:
The invention enables dynamic adjustment of the vinylsiloxane to hydrogensiloxane ratio by allowing flexible formulation of Part A and Part B separately. The ratio can be optimized for specific coating applications by adjusting the composition of the silicone part or the water/emulsifier part, providing formulation flexibility that adapts to different coating performance requirements without being constrained by pre-established two-part ratios.
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
This approach results in high-quality coatings with consistent reactivity and extended bath-life, reducing costs and complexity while maintaining excellent release properties and flexibility in coating formulations.
Implementation Method 1
mixing components to form a reactive silicone-based composition; mixing said reactive silicone-based composition with water to form the aqueous emulsion
Implementation Method 2
curing said reactive silicone-based composition on said substrate to form a crosslinked coating
Data Source
AI summary
The invention relates to a new method of coating substrates with an aqueous emulsion of a reactive silicone-based composition and a method of preparing said aqueous emulsion of said reactive silicone-based composition.