Silicone Release Coating Composition Low Release Force Emulsion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing silicone release coatings struggle to achieve low release force while maintaining high-speed cure, low migration, and good anchorage to substrates, particularly in aqueous emulsion form, as previous solutions either fail to provide adequate low release force or are not suitable for aqueous emulsions.
Innovation Solution
A silicone release coating composition comprising a long chain polysiloxane additive with high viscosity and reactive vinyl functional groups, combined with an organohydrogenpolysiloxane cross-linking agent, hydrosilylation catalyst, surfactants, and water, which forms a cured network providing lower release force and maintaining suitable viscosity for emulsification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If short chain vinyl-end silicone polymers or multiple vinyl functional silicone polymers are used to achieve fast cure with acceptable migration, then the base polymers must have low viscosity to meet manufacture process requirement, but the coating becomes difficult to provide low release force due to high cure density
Solution Approach 1:
The patent changes the molecular weight parameter of the vinyl-functional polysiloxane from short chain to long chain (5,000-150,000), which fundamentally alters the cure density and release force characteristics while maintaining fast cure capability through the vinyl functional groups
Solution Approach 2:
The patent creates a composite system by combining long chain vinyl-functional polysiloxane (providing low release force) with organohydrogenpolysiloxane cross-linking agent (providing fast cure through hydrosilylation), achieving both low release force and fast cure properties that neither component could provide alone
2Force
If long chain polysiloxane additive with high viscosity is used to achieve low release force, then the viscosity increases to provide slippery surface, but the emulsification and coating process becomes more difficult
Solution Approach 1:
The patent optimizes the viscosity parameter of the long chain polysiloxane to a specific range (5,000-150,000) that balances two opposing requirements: high enough to provide low release force and slippery surface, but not so high as to prevent proper emulsification and coating application
Solution Approach 2:
The patent introduces surfactants as intermediary substances that facilitate the emulsification of high viscosity long chain polysiloxane in water, enabling proper mixing and coating application without requiring the polysiloxane itself to have low viscosity
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 achieves lower release force, high-speed cure, low migration, and good anchorage to substrates, ensuring a slippery and smooth coating surface with improved release performance and reduced operator risk during peeling.
Implementation Method 1
comprising a long chain polysiloxane additive with high viscosity and reactive vinyl functional groups, combined with an organohydrogenpolysiloxane cross-linking agent, hydrosilylation catalyst
Data Source
AI summary
A silicone release coating composition comprises:(A) 100 weight parts of an organopolysiloxane fluid having a viscosity at 25° C. of 50 to 10,000 mPa·s and an alkenyl content of 0.10 to 3.0 wt %;(B) 0.5-40 weight parts of a diorganopolysiloxane represented by the average structural formula (1):Rc3SiO(RbRcSiO2/2)n1(Rc2SiO2/2)n2SiRc3 (1) wherein Rb is an alkenyl group; Rc is an alkyl group or a phenyl group; n1 provides an alkenyl content of 0.05 to 0.80 wt. %; n2 is at least 1; and n1+n2 provides this component with a viscosity at 25° C. of 5,000 to 150,000 mPa·s;(C) an organohydrogenpolysiloxane that has a viscosity at 25° C. of 1 to 1,000 mPa·s, at least two silicon-bonded hydrogen atoms in each molecule, and an alkyl group or a phenyl group for its silicon-bonded organic groups;(D) a hydrosilylation reaction catalyst in a catalytic amount;(E) a surfactant;(F) water; and(G) an inhibitor.