Silane-Polymer Epoxy Adhesive Hardening via Segmented Components
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Solution Overview
Problem
Hardenable silane-functional polymer compositions used as adhesives or coatings face challenges with slow hardening in thick layers or impermeable substrates, limited mechanical properties, brittleness, and unsatisfactory application properties due to high viscosity and strong odor.
Innovation Solution
A two-component composition combining a silane-functional polymer with an aqueous emulsion of epoxy resin, where the silane-functional polymer is in a non-aqueous system, allowing for quick hardening independent of temperature and humidity, with improved mechanical properties, slip resistance, and reduced odor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If single-component silane-functional polymer compositions harden with atmospheric moisture, then the composition is simple to apply, but the hardening time is relatively long due to slow moisture diffusion
Solution Approach 1:
The patent introduces a two-component system where component A (silane-functional polymer) and component B (accelerator containing water in free or bound form) are mixed before application. Component B acts as an intermediary that provides moisture to accelerate the hardening reaction of the silane groups, enabling rapid hardening without relying solely on slow atmospheric moisture diffusion.
2Productivity
If water is added to accelerate hardening of single-component silane systems, then hardening speed increases, but the system becomes sensitive to mixing quality and water quantity
Solution Approach 1:
The patent formulates component B in advance with a specific amount of water (free or bound) and accelerator substances. This preliminary preparation ensures that when components A and B are mixed, the correct amount of moisture is already available to accelerate hardening, eliminating the need for precise control of water addition during application and reducing sensitivity to mixing variations.
3Strength
If silane-functional polymer is combined with epoxy resin to improve mechanical properties, then strength and viscoelasticity increase, but viscosity becomes very high requiring large amounts of rheology aids
Solution Approach 1:
The patent divides the high-viscosity hybrid system into two separate components: component A (silane-functional polymer) and component B (accelerator solution). This segmentation allows each component to have more manageable viscosity characteristics, reducing the need for rheology aids while still achieving the desired mechanical properties when mixed and hardened.
4Strength
If hybrid system of silane-functional polymer and epoxy resin is used, then mechanical properties improve, but strong amine odor is given off during application
Solution Approach 1:
The patent extracts the accelerator substances (which cause the amine odor) from the epoxy resin component and places them in component B along with controlled amounts of water. This separation allows the epoxy resin to provide mechanical strength while the accelerator component can be formulated to minimize odor release during application, addressing the harmful odor issue while maintaining strength improvements.
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 rapid hardening, high strength and viscoelasticity, good adhesion, and thermal stability, with improved application stability and reduced odor, suitable for various substrates and applications.
Implementation Method 1
The hardening of the silane-functional polymer takes place as a result of the atmospheric moisture
Implementation Method 2
Hardenable masses based on silane-functional polymers are known. They are characterized by hardening without bubbles
Implementation Method 3
the hardening of silane-functional polymers can be accelerated by mixing in, during application, a component that contains water in free or bound form
Data Source
AI summary
The invention relates to a two-component composition, including a component A, which includes at least one silane-functional polymer and at least one hardener or accelerator for epoxy resins, and a component B, which includes at least one aqueous emulsion of at least one epoxy resin. Two-component compositions according to the invention are suitable as adhesives, sealants or coatings.