Silane-terminated polymer adhesive thermal curing
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Solution Overview
Problem
Existing adhesive technologies face challenges such as the need for isocyanate-based components, gas production during curing, and high calorific values, which can lead to defects and reduced strength in bonded assemblies.
Innovation Solution
A reactive one-component adhesive composition that is liquid at room temperature, comprising alpha-silane-terminated organic polymers, silicone resins, thermal accelerators, low molecular weight silanes, and fillers, which undergoes thermal curing without producing gas and has a low calorific value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If isocyanate-based adhesives are used to achieve rapid curing and strong bonding, then bonding strength and curing speed are improved, but harmful sensitizing effects and regulatory restrictions worsen
Solution Approach 1:
The patent removes the harmful isocyanate component from the adhesive system while maintaining the desired bonding performance through alternative chemistry (silane-based moisture curing), directly extracting the harmful element while preserving function
Solution Approach 2:
The invention changes the chemical parameters of the adhesive system by switching from isocyanate-based to silane-based chemistry, altering the curing mechanism from isocyanate reaction to moisture-induced silane hydrolysis and condensation, thereby eliminating sensitizing effects while maintaining bonding strength
2Ease of operation
If moisture-crosslinking 1K polyurethane adhesives are used to simplify processing, then ease of operation is improved, but gas production during curing worsens
Solution Approach 1:
The patent extracts the gas-producing polyurethane moisture-crosslinking mechanism and replaces it with silane-based chemistry that cures without CO2 evolution, removing the harmful gas production while keeping the 1K simplicity
Solution Approach 2:
The invention uses a single-component system where the adhesive is applied in its final form without requiring mixing or activation, eliminating complex processing steps and potential defects while maintaining ease of application
3Productivity
If conventional adhesive formulations are used to achieve rapid full-curing, then productivity is improved, but high calorific value and fire safety issues worsen
Solution Approach 1:
The patent creates a composite adhesive formulation combining silane-terminated polymers with specific fillers and additives that achieve rapid curing through thermal acceleration while simultaneously reducing the overall calorific value to meet fire safety class A2 requirements
Solution Approach 2:
The invention changes the thermal and chemical parameters of the adhesive system by incorporating thermal accelerators and modifying the polymer composition, enabling rapid curing at lower temperatures while reducing flammability and calorific value
4Reliability
If 2K polyurethane adhesives are used to achieve reliable bonding, then bonding reliability is improved, but device complexity and processing difficulty worsen
Solution Approach 1:
The patent merges the separate components of 2K systems into a single stable component that maintains reactivity until application, combining the advantages of multi-component reliability with the simplicity of single-component application through silane chemistry that remains stable until moisture exposure
Solution Approach 2:
The invention enables the adhesive to self-cure upon exposure to moisture in the environment or substrate, eliminating the need for external mixing, metering, or activation equipment, thereby achieving reliable bonding through self-service chemistry
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 adhesive composition effectively bonds substrates with rapid full-curing, meeting industrial cycle times and offering a broad adhesive spectrum, low odor, and compliance with fire safety standards, making it suitable for applications in the automotive and construction sectors.
Implementation Method 1
low molecular weight silane which has a primary or secondary amino group or a blocked amino group which hydrolyzes to the primary or secondary amino group
Implementation Method 2
curing takes place in a heated press, which accelerates the chemical curing
Data Source
AI summary
The invention relates to a reactive single-component adhesive composition which is liquid at room temperature and which has 3 wt. % to 90 wt. % of at least one alpha-silane-terminated organic polymer, 0 wt. % to 80 wt. % of at least one silicone resin, 0.1 wt. % to 5 wt. % of at least one thermal accelerator, 0.001 wt. % to 5 wt. % of at least one low-molecular silane which has a primary or secondary amino group or a blocked amino group that is hydrogenated in order to form the primary or secondary amino group, and 0 wt. % to 85 wt. % of at least one filler. The invention additionally relates to a method for adhering two substrates using the aforementioned adhesive composition and to a system adhered in such a manner.