Moisture-Curable Adhesive Composition for High Initial Strength
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Solution Overview
Problem
Existing moisture-curing compositions based on silane-functional polymers, used as adhesives, sealants, or coatings, often lack sufficient initial strength and mechanical properties, making them inadequate for applications requiring immediate bonding and thermal expansion compensation.
Innovation Solution
A composition combining a moisture-reactive silane-functional polymer, which is liquid at room temperature, with a specific silane-functional polyester, enhancing initial strength and modulus of elasticity, achieved through specific reaction products and formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If warm or hot melt adhesives are used to achieve high initial strength, then initial strength is improved, but viscosity increases sharply immediately after application making corrections difficult
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific silane-functional polymers with controlled molecular weights and silane content. This modifies the curing kinetics and viscosity evolution, allowing the adhesive to maintain workability while achieving high initial strength through optimized chemical reactions.
Solution Approach 2:
The patent creates a composite adhesive system combining silane-functional polymers with specific polyester components and silane crosslinkers. This composite formulation integrates multiple functional elements to achieve both high initial strength and controlled viscosity behavior, resolving the contradiction between strength and ease of operation.
2Strength
If warm or hot melt adhesives are used to achieve high initial strength, then initial strength is improved, but elasticity is reduced making thermal expansion compensation difficult
Solution Approach 1:
The patent adjusts the chemical composition by selecting specific silane-functional polymers with appropriate glass transition temperatures and molecular weights. This parameter optimization enables the adhesive to achieve high initial strength while maintaining sufficient elasticity for thermal expansion compensation through controlled crosslinking density.
Solution Approach 2:
The patent develops a composite system incorporating silane-functional polymers, polyester components, and silane crosslinkers in specific ratios. This composite structure provides both high initial strength and elasticity by balancing crosslinking density with polymer chain mobility, enabling thermal expansion compensation.
3Strength
If moisture-curing compositions are used to achieve high initial strength, then initial strength is improved, but prolonged fixation is still required until sufficient strength is built up
Solution Approach 1:
The patent incorporates silane crosslinkers and moisture-reactive components that begin curing immediately upon application. This preliminary action creates initial strength rapidly through fast crosslinking reactions, reducing the fixation time required while maintaining high initial strength characteristics.
Solution Approach 2:
The patent optimizes the curing kinetics by adjusting silane content, catalyst concentration, and moisture-reactive component selection. These parameter changes accelerate the initial curing rate, enabling high initial strength to be achieved faster and reducing the overall fixation time required.
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 exhibits improved initial strength and elasticity, allowing for faster bonding and better thermal compensation, reducing the need for prolonged fixation of bonded substrates and enhancing mechanical properties.
Implementation Method 1
moisture-curing compositions based on silane-functional polymers
Implementation Method 2
reaction products of any polyols with polyisocyanates, which are then reacted with amino- or mercaptosilanes
Implementation Method 3
at least one silane-functional polyester of the formula (I)
Data Source
AI summary
The present invention relates to a composition comprising at least one moisture-reactive silane-functional polymer which is liquid at room temperature, and at least one silane-functional polyester. Such compositions are suitable especially as moisture-curing compositions which are suitable as adhesives, sealants or coatings and have improved initial strengths.