Accelerator Mixture for Peroxide Curing Mortar Systems
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Solution Overview
Problem
Existing two-component mortar systems based on organic peroxide hardeners, particularly those using diacyl peroxides, face challenges in maintaining satisfactory curing properties and load values across a wide temperature range (-10°C to +40°C, with accelerators like aromatic amines and toluidines either failing at low temperatures or high temperatures.
Innovation Solution
A mixture of bis-N-substituted p-toluidine as the main accelerator and bis-N-substituted m-toluidine as a co-accelerator is used to extend gel time without negatively impacting curing properties, ensuring better low-temperature curing and high load values at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aromatic amines (anilines) are used as accelerators, then load values at high temperatures are satisfactory, but curing performance at low temperatures deteriorates
Solution Approach 1:
The patent combines two different accelerator types (aniline derivative and p-toluidine derivative) into a single accelerator mixture. The aniline component (e.g., N,N-diethylaniline) provides high-temperature stability, while the p-toluidine component (e.g., N,N-bis(2-hydroxypropyl)-p-toluidine) enhances low-temperature curing activity. This merging allows the mortar system to achieve satisfactory performance across both temperature ranges.
Solution Approach 2:
The patent modifies the accelerator system by changing the chemical structure parameters of the accelerator molecules. Specifically, it introduces p-toluidine derivatives with hydroxyl groups at controlled positions, which alter the accelerator's reactivity and temperature dependence. This parameter change enables the accelerator to maintain effectiveness across a broader temperature range.
2Ease of operation
If gel time is extended to 8-10 minutes for better processability, then processability at high temperatures improves, but load values of cured masses decrease
Solution Approach 1:
The patent merges an accelerator that extends gel time (aniline derivative) with a more active accelerator (p-toluidine derivative). The aniline component provides the extended gel time needed for processability, while the p-toluidine component ensures sufficient curing activity to maintain high load values even with the extended gel time.
Solution Approach 2:
The patent changes the kinetic parameters of the polymerization reaction by selecting accelerators with appropriate reactivity. The accelerator mixture is designed to provide a gel time of 8-10 minutes at high temperatures while maintaining curing efficiency, thus decoupling the relationship between gel time extension and strength reduction.
3Reliability
If p-toluidine is used as accelerator, then low temperature curing improves, but high temperature load values decrease
Solution Approach 1:
The patent combines p-toluidine derivatives (which provide low-temperature curing activity) with aniline derivatives (which provide high-temperature stability). This combination creates an accelerator mixture where each component compensates for the other's temperature-dependent weaknesses, achieving balanced performance across the temperature range.
4Temperature
If m-toluidine or anilines are used as accelerators, then high temperature properties improve, but low temperature properties deteriorate
Solution Approach 1:
The patent merges m-toluidine or aniline derivatives (providing high-temperature properties) with p-toluidine derivatives (providing low-temperature properties). This creates a synergistic accelerator mixture where the high-temperature component ensures stability at elevated temperatures while the low-temperature component ensures adequate curing activity at low 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 accelerator mixture achieves extended gel times with improved curing behavior at low temperatures and maintains high load values at high temperatures, providing stable properties across the temperature range.
Implementation Method 1
a resin mixture curable with diacyl peroxides
Implementation Method 2
a resin mixture based on radically polymerizable compounds
Implementation Method 3
a compound capable of accelerating the polymerization reaction, which serves to accelerate the formation of the radical initiator
Data Source
AI summary
This paper describes an accelerator mixture for peroxide hardeners, specifically an accelerator mixture for a resin mixture curable with organic peroxides, a two-component mortar system containing this mixture for chemical anchoring, and its use for the chemical anchoring of anchors in boreholes. A mixture of bis-N-substituted p-toluidines with bis-N-substituted m-toluidines makes it possible to provide a mortar for the chemical anchoring of anchors in boreholes that exhibits improved low-temperature curing and improved high-temperature load-bearing capacity with an extended gel time.