Trisiloxane Spacer Siloxane Coupling Agents for Uniform Surface Coverage
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Solution Overview
Problem
Traditional silane coupling agents face challenges in providing uniform surface coverage and wear resistance due to entanglement of organofunctional groups, leading to poor mechanical properties and compatibility issues with certain resins, resulting in non-homogeneous mixtures and instability in composite materials under mechanical stresses.
Innovation Solution
The development of novel organofunctional siloxane coupling agents with a trisiloxane spacer that increases the boundary layer between the organofunctional group and the substrate, preventing entanglement and enhancing flexibility, along with a method involving the addition reaction of hydrido alkoxysilanes and organofunctional disiloxanes to cyclosiloxanes, which produces coupling agents suitable for adhesives, coatings, and sealants with improved wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional silane coupling agents are used, then organofunctional groups can be attached to inorganic substrates, but the organofunctional groups become entangled and buried within the coating, resulting in non-uniform surface coverage and poor wear resistance
Solution Approach 1:
The patent introduces a trisiloxane spacer that extends the boundary layer perpendicular to the substrate surface, moving the organofunctional groups from a two-dimensional surface plane to a three-dimensional spatial arrangement. This dimensional extension prevents entanglement and burial of functional groups within the coating matrix, achieving uniform surface coverage while maintaining wear resistance.
Solution Approach 2:
The trisiloxane spacer acts as an intermediary element between the inorganic substrate and the organofunctional groups. This mediator increases the boundary layer thickness and provides physical separation, preventing the organofunctional groups from becoming entangled or buried in the coating, thereby resolving the contradiction between surface coverage uniformity and wear resistance.
2Stability of the object's composition
If traditional silane coupling agents with short spacers are used, then the coating structure is compact, but the organofunctional groups entangle and the coating becomes brittle under mechanical stresses
Solution Approach 1:
By extending the spacer into the third dimension (increasing boundary layer thickness perpendicular to the substrate), the patent maintains a compact coating structure parallel to the substrate while providing sufficient spatial separation for organofunctional groups. This prevents brittleness under mechanical stresses while preserving coating compactness.
Solution Approach 2:
The patent changes the critical parameter of spacer length and boundary layer thickness. By increasing the boundary layer thickness to at least 5 nm, the organofunctional groups gain sufficient spatial separation to prevent entanglement and maintain flexibility under mechanical stresses, while the overall coating structure remains compact and stable.
3Manufacturing precision
If higher loading of silane coupling agents is used to achieve desired surface coverage, then more organofunctional groups reach the surface, but the coating becomes thicker and more prone to cracking and delamination
Solution Approach 1:
The extended trisiloxane spacer acts as a mediator that increases the boundary layer thickness, allowing organofunctional groups to be positioned farther from the substrate surface. This enables adequate surface coverage to be achieved with lower silane coupling agent loading, preventing coating thickening and the associated problems of cracking and delamination.
Solution Approach 2:
By changing the boundary layer thickness parameter (increasing it to at least 5 nm), the patent achieves a more efficient distribution of organofunctional groups. This allows desired surface coverage to be attained with lower coupling agent concentrations, maintaining coating integrity while ensuring adequate surface coverage.
4Length of moving object
If conventional alkyl spacers are used, then the organic group is attached to silicon, but the boundary layer is too thin leading to entanglement of organofunctional groups
Solution Approach 1:
The patent transitions from conventional short alkyl spacers to a trisiloxane spacer that extends the boundary layer in the perpendicular dimension. This dimensional extension increases boundary layer thickness to at least 5 nm, providing sufficient spatial separation to prevent entanglement of organofunctional groups while maintaining uniform distribution.
Solution Approach 2:
The trisiloxane spacer serves as an intermediary that increases the boundary layer thickness between the inorganic substrate and the organofunctional groups. This mediator provides the necessary spatial separation to prevent entanglement, achieving both increased boundary layer thickness and improved organofunctional group distribution uniformity.
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 novel siloxane coupling agents achieve uniform surface coverage, increased wear resistance, and improved compatibility with various resins, enhancing the mechanical and physical properties of composite materials while reducing VOC content and maintaining faster reactivity, thus creating a safer and more effective industrial solution.
Implementation Method 1
The invention provides an addition reaction, in the presence of a catalyst, of a hydrido alkoxysilane and an organofunctional disiloxane to a cyclosiloxane
Implementation Method 2
The hydrolysable component of organofunctional silanes will hydrolyze readily with water to form silanols allowing silicon to covalently bond to inorganic surfaces via a condensation reaction
Implementation Method 3
allowing silicon to covalently bond to inorganic surfaces via a condensation reaction to form a siloxane bond
Data Source
AI summary
The present invention provides organofunctional siloxane coupling agents, dipodal siloxanes, siloxane block copolymers and a specific method for preparing these organofunctional siloxanes through an addition reaction of hydrido alkoxysilane and organofunctional disiloxanes to an organocyclosiloxane with a catalyst. The addition reaction of the current invention does not result in polymerization and therefore the novel siloxane couplings agents are free of cyclosiloxanes and polymeric siloxanes. This makes them apt for adhesives, coatings and sealant applications. The present invention also relates to the use of these organofunctional siloxane compounds for the treatment of fillers and surfaces.