Isocyanate-Amine Chemical Dowel Storage Stability
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Solution Overview
Problem
Existing binder systems for chemical fastening of construction elements, particularly those based on isocyanate-amine adducts, suffer from inadequate storage stability and temperature robustness, with polyaspartic acid esters leading to softening at elevated temperatures and instability in storage.
Innovation Solution
A multi-component resin system comprising an isocyanate component with aliphatic and/or aromatic polyisocyanates and an amine component with an average NH functionality of 2 or greater, free from polyaspartic acid esters, incorporating a molecular sieve as a drying agent to enhance storage stability, and filled with inorganic fillers and rheology additives to achieve a total filling level of 30-80% in the mortar mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyaspartic acid esters are used in isocyanate-amine-based binder systems, then the system achieves good initial bonding properties, but the cured mortar exhibits insufficient crosslinking and softens significantly at temperatures of 80°C
Solution Approach 1:
The patent changes the chemical composition parameters by completely excluding polyaspartic acid esters and using alternative amine components with different functional groups (such as polyamines, diamines, triamines) that form more thermally stable crosslinked networks, thereby improving temperature robustness while maintaining bonding properties
Solution Approach 2:
The patent creates a composite binder system combining isocyanate components with carefully selected amine components that have complementary properties, forming a multi-functional cured network that achieves both good initial bonding and high temperature resistance through synergistic interactions between different chemical components
2Reliability
If isocyanate-amine adducts are used for chemical fastening, then effective bonding is achieved, but the compositions exhibit poor storage stability and are not stable to bases
Solution Approach 1:
The patent divides the binder system into separate isocyanate and amine components that are stored independently and only mixed at the time of application, preventing premature reaction and maintaining storage stability of each component while ensuring effective bonding performance when properly combined
Solution Approach 2:
The patent modifies the chemical parameters of the amine components by selecting specific types (polyamines, diamines, triamines) with appropriate functionality and reactivity, and controls the NCO:NH ratio to optimize both storage stability and bonding performance, creating a more stable composition that resists base degradation
3Temperature
If multi-component resin systems based on isocyanate-amine adducts are developed to improve temperature robustness, then thermal performance is enhanced, but the compositions become less stable in storage
Solution Approach 1:
The patent maintains separate storage of isocyanate and amine components in a multi-component system, preventing premature polyaddition reactions that would compromise storage stability, while ensuring that each component is formulated for optimal thermal performance in the cured state
Solution Approach 2:
The patent carefully controls the functionality and reactivity parameters of the amine components (using polyamines, diamines, triamines with specific NH functionalities) and adjusts the NCO:NH ratio to achieve a balance between storage stability and temperature robustness, preventing excessive reactivity that would reduce storage life while maintaining thermal performance
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 system demonstrates improved storage stability and temperature robustness, preventing blistering and mortar leakage during storage, even at elevated temperatures, while maintaining effective bonding properties.
Implementation Method 1
the isocyanate component contains a molecular sieve as a drying agent
Data Source
AI summary
The present invention relates to a multicomponent resin system for producing a mortar compound on the basis of isocyanate-amine adducts for chemically fastening construction elements. The invention further relates to a mortar compound on the basis of isocyanate-amine adducts produced from the multicomponent resin system. The subject matter of the present invention also relates to a method and a use of a mortar compound on the basis of the isocyanate-amine adducts for chemically fastening construction elements in mineral substrates.