Peroxide-Free Reactive Resin Composition for Cold Curing
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Solution Overview
Problem
Existing reactive resin compositions for chemical fastening technology face challenges such as the use of hazardous materials, thermal sensitivity, and storage stability issues due to the reliance on peroxides and critical amine compounds, which restrict their application in construction sites and require labeling, and they are not robust to mixing ratio fluctuations.
Innovation Solution
A reactive resin composition using a halogen carboxylic acid ester as a radical initiator with Cu(0) or inorganic Cu(I) compounds and nitrogen-containing ligands as a catalyst system, allowing for peroxide-free, cold-curing, and stable polymerization between -10°C and +60°C, without the need for labeling and with flexibility in mixing ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peroxides are used as radical initiators to enable rapid and complete curing at low temperatures, then the curing speed and reliability are improved, but the thermal sensitivity and storage stability deteriorate
Solution Approach 1:
The patent removes peroxides from the hardener composition entirely, replacing them with alternative radical initiators (azobisisobutyronitrile, 2,2'-azobis(2-methylpropionitrile), or 1,1'-azobis(cyclohexanecarbonitrile)) that do not exhibit the same thermal sensitivity and storage stability problems while maintaining the ability to enable rapid and complete curing at low temperatures
2Reliability
If peroxides are used as radical initiators, then the curing performance is improved, but the formulation flexibility and component selection are restricted
Solution Approach 1:
By extracting peroxides from the system, the patent eliminates the restrictions they impose on formulation flexibility and component selection, allowing broader choices in resin types, fillers, and other additives without concerns about peroxide compatibility, thermal sensitivity, or storage stability
Solution Approach 2:
The patent changes the chemical nature of the radical initiator from peroxide-based to azo-based compounds, fundamentally altering the initiation mechanism and enabling greater formulation flexibility while maintaining effective low-temperature curing performance
3Reliability
If peroxides are used in significant amounts, then the curing effectiveness is improved, but the labeling requirements and user acceptance deteriorate
Solution Approach 1:
The patent removes peroxides from the hardener composition, eliminating the need for sensitizing labels that would otherwise be required when peroxide concentrations reach 1% or higher, thereby improving user acceptance and reducing regulatory burden
4Speed
If amine accelerators are used to enable low-temperature curing, then the curing speed is improved, but the labeling requirements and user acceptance deteriorate
Solution Approach 1:
The patent removes amine accelerators from the hardener composition, replacing their function with alternative mechanisms that do not require labeling, while still maintaining the ability to achieve rapid and complete curing at low temperatures through the use of azo-based radical initiators and optimized resin formulations
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 provides a stable, peroxide-free, and cold-curing reactive resin system suitable for construction applications, ensuring reliable hardening across a wide temperature range and improved storage stability without the use of hazardous materials or labeling requirements.
Implementation Method 1
an initiator system which contains an initiator and a catalyst system, the catalyst system containing at least one nitrogen-containing ligand and Cu(0) or an inorganic Cu(I) compound
Implementation Method 2
Radically curable systems, especially systems curable at room temperature, require so-called radical starters, also called initiators, so that the radical polymerization can be triggered
Data Source
AI summary
A reaction resin composition having a resin component which contains a radically polymerizable compound and having an initiator system which contains an α-halocarboxylic acid ester and a catalyst system that comprises a nitrogen-containing ligand and Cu(0) or an inorganic Cu(I) compound, and the use thereof for construction purposes are described.