Foundry Mold Binder Composition Reducing Formaldehyde
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Solution Overview
Problem
Existing binder compositions for foundry molds have insufficient hardening rates and mold strengths, and they generate excessive formaldehyde during the production process, which deteriorates the working environment.
Innovation Solution
A binder composition incorporating 5-position-substituted-furfural compounds such as 5-hydroxymethylfurfural and 5-acetoxymethylfurfural, along with urea and its derivatives, which improves the hardening rate and mold strength while reducing formaldehyde generation, is used in conjunction with refractory particles and a hardener.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional acid-hardening resins (furan resin, phenolic resin) are used as binders, then mold strength and hardening rate are achieved, but excessive formaldehyde is generated during production
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by using 5-position-substituted-furfural compounds (5-hydroxymethylfurfural and 5-acetoxymethylfurfural) instead of conventional furan resins or phenolic resins. This substitution maintains the hardening characteristics while significantly reducing formaldehyde generation during the acid-hardening process, thus resolving the contradiction between mold strength and harmful emissions.
Solution Approach 2:
The invention creates a composite binder system combining 5-position-substituted-furfural compounds with urea and its derivatives. This composite material approach allows the binder to achieve both high mold strength and reduced formaldehyde generation, as the urea components contribute to the binding strength while the modified furfural structure minimizes formaldehyde release during hardening.
2Strength
If conventional binders are used, then mold production is achieved, but the hardening rate and mold strength are insufficient
Solution Approach 1:
The invention optimizes the chemical structure parameters of the binder by selecting specific 5-position-substituted-furfural compounds (5-hydroxymethylfurfural and 5-acetoxymethylfurfural) that exhibit superior hardening characteristics. These compounds react more efficiently with acid hardeners, achieving both high mold strength and accelerated hardening rates, thereby resolving the contradiction between strength and productivity.
Solution Approach 2:
The invention introduces urea and its derivatives as intermediary components in the binder system. These intermediaries facilitate the hardening reaction between the 5-position-substituted-furfural compounds and acid hardeners, enhancing both the hardening rate and final mold strength. The urea components act as reactive mediators that improve the overall performance of the binder system.
3Object-affected harmful factors
If furan-modified urea resin is used to reduce formaldehyde, then storage stability improves, but mold strength and hardening rate are compromised
Solution Approach 1:
The invention changes the molecular structure parameters by using 5-position-substituted-furfural compounds with specific functional groups (hydroxymethyl or acetoxymethyl at the 5-position) that inherently reduce formaldehyde generation while maintaining reactivity. This structural modification allows the binder to achieve low formaldehyde emissions without sacrificing mold strength or hardening rate, overcoming the limitations of furan-modified urea resins.
Solution Approach 2:
The invention creates an optimized composite system combining 5-position-substituted-furfural compounds with urea and its derivatives in specific proportions. This composite approach synergistically combines the low formaldehyde generation of modified furfural structures with the strength-enhancing properties of urea, achieving both environmental benefits and high performance in mold strength and hardening rate.
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 proposed binder composition enhances the hardening rate and mold strength while significantly reducing formaldehyde production, thereby improving the working environment and productivity in foundry mold production.
Implementation Method 1
a binder composition for making foundry molds including an acid-hardening resin, one or more 5-position-substituted-furfural compound(s) selected from the group consisting of 5-hydroxymethylfurfural and 5-acetoxymethylfurfural
Implementation Method 2
hardening the acid-hardening resin
Data Source
AI summary
A binder composition for making foundry molds, comprising an acid-hardening resin, one or more 5-position-substituted-furfural compounds selected from the group consisting of 5-hydroxymethylfurfural and 5-acetoxymethylfurfural, and one or more compounds selected from the group consisting of urea and derivatives of urea, wherein the content of the 5-position-substituted-furfural compound(s) by percentage is from 1 to 60% by weight of the binder composition. The content of the compound(s) by percentage selected from the group consisting of urea and derivatives of urea is preferably from 0.3 to 10% by weight of the binder composition.