Low-Temperature Curing Organopolysiloxane Composition
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Solution Overview
Problem
Curable organopolysiloxane compositions face challenges in quickly curing at low temperatures, particularly below 30°C, which is necessary for outdoor applications during winter, and fail to form strong bonds with substrates at such temperatures.
Innovation Solution
A curable organopolysiloxane composition comprising an epoxy group-containing organopolysiloxane, a mercapto group-containing compound, and an amine or phosphine compound without N—H or P—H bonds, which allows for curing at temperatures ranging from −5 to 30°C, ensuring rapid curing and strong bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional curable organopolysiloxane compositions are used, then excellent adhesion and bonding properties are achieved, but quick curing at low temperatures (30°C or lower) is difficult
Solution Approach 1:
The patent changes the chemical parameters of the curing system by introducing a specific amine compound without N-H bonds and a phosphine compound without P-H bonds as curing catalysts. These compounds have unique molecular structures that enable them to catalyze the curing reaction effectively at low temperatures, transforming the temperature-speed relationship of the curing process
Solution Approach 2:
The patent creates a composite curing system by combining multiple components: epoxy group-containing organopolysiloxane, mercapto group-containing compound, amine compound without N-H bonds, and phosphine compound without P-H bonds. This composite formulation works synergistically to achieve rapid curing at low temperatures while maintaining excellent bonding properties
2Adaptability or versatility
If curing is performed at low temperatures, then outdoor winter application is enabled, but bonding strength with substrates deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting specific amine and phosphine compounds that maintain catalytic activity at low temperatures. These compounds have molecular structures that allow them to facilitate strong bond formation even when thermal energy is limited, thus preserving bonding strength across a wide temperature range
Solution Approach 2:
The amine compound without N-H bonds and phosphine compound without P-H bonds act as intermediary catalysts that mediate between the epoxy groups and the substrate. These intermediaries lower the activation energy required for bond formation, enabling strong adhesion at low temperatures where direct reaction would be insufficient
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 favorable curability and mechanical strength at low temperatures, enabling quick curing and excellent bonding with substrates, even in cold conditions, making it suitable for applications where heat is not readily available.
Implementation Method 1
an amine compound not having a N—H bond and/or a phosphine compound not having a P—H bond
Data Source
AI summary
A curable organopolysiloxane composition comprises: (A) an epoxy group-containing organopolysiloxane represented by the average composition formula:XaR1bSiO(4−a−b)/2 wherein X represents at least one type of epoxy group selected from a glycidoxyalky group, an epoxycycloalkyl alkyl group, and an epoxyalkyl group; R1 represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an aralkyl group, a hydroxyl group, or an alkoxy group; provided at least two X groups are present in a molecule; and “a” and “b” are numbers satisfying: 0<a<1, 0<b<3, and 0.8<(a+b)<3; (B) a compound having at least two mercapto groups in a molecule; and (C) an amine compound not having a N—H bond and/or a phosphine compound not having a P—H bond. The composition has favorable curability even at a relatively low temperature, and forms a cured film having excellent bonding with regard to an object to be coated.