Low Intensity UV Curable Silicone Release Coating
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Solution Overview
Problem
Current curable silicone release coatings face challenges in achieving a balance between long pot life and short cure time, often requiring high platinum loadings and inhibitors like ETCH, which can slow down the curing process and increase costs.
Innovation Solution
A curable silicone release coating composition comprising a polyorganosiloxane with aliphatically unsaturated groups, a polyorganohydrogensiloxane, a platinum hydrosilylation reaction catalyst package, an inhibitor selected from fumarate or maleate, and a primary or secondary alcohol, which allows for a cost-effective and efficient curing process with low intensity UV radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If an inhibitor such as ETCH is added to increase pot life, then the curable composition remains flowable longer, but the cure speed slows down requiring high temperatures or long heating times
Solution Approach 1:
The patent changes the chemical parameters of the inhibition system by selecting specific inhibitors (phenolic compounds with pKa values of 9-11) and controlling their concentration (0.01-5 wt%). This parameter optimization allows the composition to maintain long pot life while achieving rapid cure when catalyst is added, resolving the contradiction between extended stability and fast curing speed.
2Productivity
If high platinum loadings are used to achieve high speed coating and curing, then the cure time is reduced, but the cost increases significantly
Solution Approach 1:
The patent optimizes the platinum catalyst loading parameter to a specific range (0.1-10 ppm) and combines it with optimized inhibitor concentrations and selection. This parameter optimization achieves rapid cure speeds without requiring excessive platinum, thereby reducing material costs while maintaining high productivity.
3Productivity
If intense UV radiation is used to cure the composition rapidly, then the cure time is reduced, but the equipment complexity and energy consumption increase
Solution Approach 1:
The patent changes the chemical parameters of the composition (catalyst type, inhibitor selection and concentration) to enable curing at lower UV radiation intensities. This allows rapid curing to be achieved with less intense radiation, reducing energy consumption and simplifying equipment requirements while maintaining high cure speeds.
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 provides a long pot life and rapid curing, reducing the need for high platinum loadings and inhibitors, thus lowering costs while maintaining effective curing performance.
Implementation Method 1
a platinum catalyzed hydrosilylation of a curable composition including a vinyl terminated polydiorganosiloxane base polymer, a polyorganohydrogensiloxane crosslinker
Implementation Method 2
exposure to low intensity UV radiation
Data Source
AI summary
A curable silicone release coating composition and method for its preparation are disclosed. The curable silicone release coating composition cures to form a silicone release coating after exposure to ultra-violet radiation at an intensity ≤ 1 J/cm2.