Reactive Diluent Mixture for High-Temperature Chemical Fixing
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Solution Overview
Problem
Existing chemical mortars face performance drops at elevated temperatures, leading to reduced permissible loads, and the use of long-chain reactive diluents results in labeling requirements despite efforts to reduce peroxide concentration, limiting the selection of raw materials for label-free or low-label applications.
Innovation Solution
A reactive resin mixture containing a blend of low molecular weight mono- and oligoalkylene glycol di(meth)acrylates with up to three alkylene glycol repeating units and polyalkylene glycol di(meth)acrylates with four or more repeating units, where the weight-average number of repeating units is less than 4, to enhance performance at elevated temperatures without compromising labeling or mixing robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If long-chain reactive diluents (oligoalkylene glycol di(meth)acrylates with 4.2 to 7 repeating units) are used to ensure robustness during mixing, then mixing robustness is improved, but high-temperature performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the average number of repeating units in the reactive diluent mixture to be less than 4. This parameter optimization resolves the contradiction by selecting a specific molecular weight range that provides both adequate mixing robustness and acceptable high-temperature performance, avoiding the excessive chain length that causes performance degradation at elevated temperatures
Solution Approach 2:
The patent uses composite materials by creating a mixture of different alkylene glycol di(meth)acrylates with varying chain lengths. This composite approach allows the formulation to benefit from both shorter chains (which maintain high-temperature performance) and longer chains (which provide mixing robustness), achieving a balance that neither component alone could provide
2Object-affected harmful factors
If peroxide concentration is reduced to meet environmental regulations, then environmental compliance is improved, but the selection of suitable reactive diluents deteriorates due to labeling requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the reactive diluent composition to have an average of less than 4 repeating units. This compositional parameter change enables the formulation to achieve both low peroxide concentration (meeting environmental regulations) and freedom from labeling requirements, as the specific diluent composition falls below regulatory thresholds for hazardous classification
3Stability of the object's composition
If the average number of repeating units is increased to improve mixing robustness, then mixing robustness is improved, but high-temperature performance deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing the critical parameter threshold of average repeating units less than 4. This quantitative parameter control resolves the contradiction by identifying the optimal molecular weight range that provides sufficient mixing robustness while preventing the chain length from becoming excessive and causing high-temperature performance degradation
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 solution provides reactive resin mortars with improved high-temperature performance, maintaining robustness and avoiding labeling requirements, thus enabling effective chemical fastening at temperatures around +80°C while adhering to environmental standards.
Implementation Method 1
at least one radically curable compound as the reactive resin
Data Source
AI summary
This paper describes reactive resin mixtures comprising a radically curable compound and a mixture of two reactive diluents selected from alkylene glycol di(meth)acrylates, as well as reactive resin components and multi-component reactive resin systems derived therefrom. Furthermore, it describes the use of a mixture of two reactive diluents selected from alkylene glycol di(meth)acrylates to enhance the performance of a fastening arrangement with a reactive resin mortar containing this mixture and a fastener at elevated temperatures.