Formaldehyde Scavenger Binder System for Foundry Cores
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Solution Overview
Problem
The production of feeders, foundry cores, and molds in polyurethane cold-box and no-bake processes results in significant formaldehyde emissions, particularly due to thermal exposure, which cannot be adequately captured by existing protective measures, posing a workplace contamination issue.
Innovation Solution
A binder system comprising a phenolic resin component, a polyisocyanate component, and additional substances like amino acids and urea, which are spatially separate to prevent premature reaction, allowing amino acids and urea to act as formaldehyde scavengers upon thermal exposure, forming nonvolatile reaction products and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If phenolic resin is used as binder component, then binding strength is achieved, but formaldehyde emissions occur during thermal exposure
Solution Approach 1:
Amino acids and urea are introduced as intermediary substances that react with formaldehyde to form nonvolatile reaction products. These intermediaries capture the harmful formaldehyde emissions generated by the phenolic resin binder, converting them into stable compounds that do not evaporate during thermal exposure in metal casting processes.
Solution Approach 2:
The invention converts the harmful formaldehyde emissions into beneficial nonvolatile reaction products through chemical reaction with amino acids and urea. The formaldehyde that would otherwise be emitted as contamination is transformed into stable, non-evaporating compounds, turning a harmful byproduct into a beneficial reduction of workplace contamination.
2Adaptability or versatility
If amino acids are added to phenol-formaldehyde condensation product, then water-solubility is improved, but formaldehyde scavenging capability is reduced
Solution Approach 1:
Amino acids and urea are added to the binder system before the phenol-formaldehyde condensation reaction occurs, ensuring they are present in the final binder composition. This preliminary incorporation guarantees that the formaldehyde scavenging substances are available to capture formaldehyde emissions during subsequent thermal exposure, while also providing the water-solubility benefits of amino acid incorporation.
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 binder system effectively reduces formaldehyde emissions by utilizing amino acids and urea to bind molecular formaldehyde, forming nonvolatile products that minimize workplace contamination during the production and use of feeders, foundry cores, and molds.
Implementation Method 1
amino acids and urea to bind molecular formaldehyde, forming nonvolatile reaction products
Data Source
AI summary
A description is given of a binder system, intended more particularly for use in a process from the group consisting of polyurethane cold-box processes and polyurethane no-bake processes.