Siloxane Oligomer Adhesive Fast Skin Formation
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Solution Overview
Problem
Existing adhesive and sealant formulations using aminopropyltrialkoxysilanes suffer from slow skin formation times and require high catalyst amounts, resulting in inadequate mechanical properties and adhesion, necessitating additional primer steps and increasing process complexity.
Innovation Solution
A siloxane compound comprising specific building blocks, allowing for reduced catalyst usage or elimination, faster skin formation, and superior mechanical properties such as high tensile strength and elongation at break, without the need for primers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If amino-functional alkoxysilanes are used as bonding agents, then adhesion to substrates is improved, but skin formation time becomes too slow and high catalyst amounts are required
Solution Approach 1:
The patent changes the chemical parameters of the bonding agent by using siloxane oligomers with specific structures (combining α-silane and aminopropylsilane building blocks) instead of conventional amino-functional alkoxysilanes. This structural parameter change enables both fast skin formation and good adhesion without requiring high catalyst amounts.
Solution Approach 2:
The invention creates a composite bonding agent by combining two different silane building blocks (α-silane and aminopropylsilane) into a single siloxane oligomer structure. This composite structure integrates the fast-reacting α-silane component with the adhesion-promoting aminopropylsilane component, resolving the contradiction between speed and adhesion.
2Speed
If high catalyst amounts are used to achieve sufficient reactivity, then skin formation speed is improved, but mechanical properties of the cured adhesive deteriorate
Solution Approach 1:
The patent changes the chemical structure parameter of the bonding agent to intrinsically more reactive siloxane oligomers. This structural change increases reactivity without relying on high catalyst amounts, thereby preserving mechanical properties. The oligomeric structure with specific Si-O-Si linkages provides both fast reaction kinetics and good mechanical performance.
3Device complexity
If conventional bonding agents are used, then formulation simplicity is maintained, but adhesion performance is insufficient requiring additional primer steps
Solution Approach 1:
The siloxane oligomer bonding agent performs multiple functions simultaneously: it provides fast skin formation, ensures excellent adhesion to difficult substrates without primers, and maintains good mechanical properties. This multi-functionality eliminates the need for separate primer steps while keeping the formulation simple.
Solution Approach 2:
By changing the molecular weight and structure parameters to create oligomeric rather than monomeric bonding agents, the patent achieves enhanced adhesion performance that eliminates the need for primers, while the formulation remains as simple as conventional systems.
4Strength
If siloxane oligomers based on aminopropyl- and alkyl-silanes are used, then adhesion performance is improved, but reactivity becomes insufficient
Solution Approach 1:
The patent creates a composite siloxane oligomer structure that combines α-silane building blocks (providing fast reactivity through their reactive silane groups) with aminopropylsilane building blocks (providing adhesion promotion). This composite structure integrates both required properties within a single oligomeric molecule.
Solution Approach 2:
Different parts of the siloxane oligomer structure have different functions: the α-silane portions provide fast reaction capability while the aminopropylsilane portions provide adhesion promotion. This local differentiation of function within the oligomer resolves the contradiction between reactivity and adhesion.
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 siloxane compound significantly shortens skin formation time and enhances adhesion and mechanical properties, providing a balanced set of results including fast curing and strong bonds without the need for primers.
Implementation Method 1
The siloxane compound for use as bonding agent in an adhesive formulation or a sealant formulation comprises at least one building block according to formula (A) and at least one building block according to formula (B)
Data Source
AI summary
The present invention concerns a siloxane compound, a method for its synthesis, its use as a component in an adhesive formulation and a kit-of-parts for said purpose.