One-Component Moisture Curing Composition for Adhesion Stability
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Solution Overview
Problem
Existing soft-elastic sealants and adhesives based on polyurethane or silane-functional polymers lack sufficient adhesive properties and heat resistance, particularly after water immersion and high-temperature exposure, making them unsuitable for applications requiring stability at elevated temperatures.
Innovation Solution
A one-component moisture curing composition comprising a silane-group containing polymer, a small amount of epoxy resin, a high amount of epoxy silane, polyketimine, and optional fillers and plasticizers, which provides improved adhesion and heat stability, especially on mortar, concrete, and plastic substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If soft-elastic sealants and adhesives are based on polyurethane or silane-functional polymers, then they achieve soft-elastic properties with high elongation and moderate hardness, but they show weaknesses in adhesive properties and heat resistance, particularly after water immersion and heat attack
Solution Approach 1:
The patent combines silane-functional polymers with epoxy resins to create a composite material system. The silane-functional polymer provides soft-elastic properties and flexibility, while the epoxy resin contributes adhesive strength and heat resistance. This composite approach allows the material to simultaneously achieve soft-elastic characteristics and superior adhesion stability after water immersion and heat exposure.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating specific ratios of silane-functional polymer, epoxy resin, and crosslinking agents. By adjusting these compositional parameters, the material achieves both the desired soft-elastic properties and enhanced adhesive reliability under extreme conditions.
2Ease of operation
If adhesives are based on a combination of silane-functional polymers and epoxy resins, then materials of high hardness and some elongation are achievable, but they typically need to be packed as two-component compositions requiring a mixing step, which is inconvenient and prone to mistakes
Solution Approach 1:
The patent merges previously separate components (silane-functional polymer and epoxy resin) into a single-component system. The epoxy resin is incorporated during the polymer synthesis stage, allowing the final adhesive to be applied directly without mixing. This eliminates application errors while maintaining the strong adhesive properties of the epoxy-silane combination.
Solution Approach 2:
The epoxy resin is pre-incorporated into the polymer structure during manufacturing, before the product reaches the end user. This preliminary action ensures that the adhesive components are already properly combined and distributed, eliminating the need for field mixing and ensuring consistent adhesive strength upon application.
3Reliability
If known one-component moisture curing compositions are based on silane group-containing polymers from hydrosilylation of polyetherglycol allylethers, then they enable adhesives with adhesion to mortar or concrete under dry conditions, but the obtained adhesion after water immersion and heat stability after curing are insufficient
Solution Approach 1:
The patent creates a composite system combining silane-functional polymers with epoxy resins and crosslinking agents. This composite structure provides both water immersion resistance and heat stability, as the epoxy component forms a highly crosslinked network that maintains adhesion properties under extreme environmental conditions.
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating epoxy resins and crosslinking agents in specific amounts. This compositional modification enhances both the water resistance and heat stability of the adhesive, allowing it to maintain strong adhesion to mortar and concrete even after prolonged exposure to water and high temperatures.
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 excellent adhesion and heat stability, maintaining properties up to 200°C for 2 hours and 90°C for 28 days, with long-term resistance, making it suitable for construction and vehicle applications.
Implementation Method 1
one-component moisture curing composition
Implementation Method 2
one-component moisture curing composition
Implementation Method 3
combination of silane group-containing polymers and epoxy resins
Data Source
AI summary
A one-component moisture curing composition including 100 weight parts of a polymer containing silane groups of the formula (I), 5 to 50 weight parts of at least one liquid epoxy resin, at least one polyketimine, 2 to 15 weight parts of at least one epoxy silane, 0 to 500 weight parts of fillers and 0 to 500 weight parts of plasticizers.