Silicone Release Coating Using Non-Tin Catalyst and Cocatalyst
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Solution Overview
Problem
The silicone release coating compositions of condensation reaction curing type face challenges due to the toxicity and environmental hazards of tin compounds, while alternative non-tin catalysts often exhibit slow reaction rates, gelation tendencies, and high costs, limiting their use for rapid curing at low temperatures.
Innovation Solution
A silicone release coating composition that uses a non-tin metal compound catalyst in combination with a nitrogen atom-containing cocatalyst or oxygen multidentate ligand, allowing for effective curing through condensation reaction involving dehydrogenation and dealcoholization, forming a non-tacky coating film with good releasability on various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tin compound catalyst is used for condensation reaction curing, then curability and reaction rate are improved, but toxicity and environmental harm increase
Solution Approach 1:
The invention extracts and removes the harmful tin compound catalyst from the silicone composition, replacing it with a non-toxic alternative (amino acid or peptide compound) that maintains the desired curability while eliminating reproductive toxicity and environmental harm
Solution Approach 2:
The invention uses biodegradable amino acid or peptide compounds as catalysts instead of persistent tin compounds, creating a temporary catalytic system that degrades harmlessly after use, thus eliminating long-term environmental accumulation while maintaining effective curability
2Object-affected harmful factors
If non-tin metal compound catalyst is used, then toxicity is reduced, but reaction rate decreases and gelation occurs
Solution Approach 1:
The invention changes the chemical parameters of the catalyst by using specific amino acid or peptide compounds with particular molecular structures and functional groups, which provide optimal catalytic activity for condensation reaction while avoiding the gelation problems associated with conventional non-tin metal compounds
Solution Approach 2:
The invention uses composite catalytic systems where amino acid or peptide compounds work synergistically with the silicone composition, creating a unified system that achieves both safe toxicity profile and high reaction rate without gelation
3Object-affected harmful factors
If conventional non-tin catalysts are used, then environmental harm is reduced, but cost increases and gelation occurs
Solution Approach 1:
The invention employs amino acid or peptide compounds that can be produced through biotechnological processes at lower cost compared to rare metal catalysts, while their biodegradability ensures they do not persist in the environment, thus achieving both cost-effectiveness and environmental friendliness
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 excellent curability and releasability without the safety and environmental concerns of tin compounds, offering improved shelf life, pot life, and workability, and the ability to mix with various materials, making it suitable for applications where addition reaction curable silicone compositions face difficulties.
Implementation Method 1
curing through condensation reaction involving dehydrogenation and dealcoholization
Implementation Method 2
component (C) in a catalyst quantity which is a compound of metal selected from magnesium, aluminum, titanium, chromium, iron, cobalt, nickel, copper, zinc, zirconium, tungsten, and bismuth, which functions as a condensation reaction catalyst
Data Source
AI summary
Disclosed herein is a silicone release coating composition of condensation reaction curing type including: (A) an organopolysiloxane having at least two silanol groups in one molecule; (B) (B-1) an organohydrogenpolysiloxane having at least three SiH groups in one molecule, and/or (B-2) an organopolysiloxane having at least three hydrolyzable groups directly bonded to a silicon atom in one molecule; (C) a compound of metal selected from Mg, Al, Ti, Cr, Fe, Co, Ni, Cu, Zn, Zr, W, and Bi, which functions as a condensation reaction catalyst; and (D) (D-1) a cocatalyst of an organic compound having a bond between a nitrogen atom and an oxygen atom and/or a bond between a nitrogen atom and a sulfur atom through 1 to 3 carbon atoms, or (D-2) a cocatalyst of an organic compound functioning as an oxygen multidentate ligand. According to the present invention, outstanding curability and releasability can be accomplished despite a catalyst of a non-tin metal compound. Because of the absence of tin compounds having potential problems with safety and environmental pollution, the silicone composition disclosed herein will find use in new application areas where a siloxane composition of addition reaction curing type is not suitable.