Lignite Silicate Isocyanate Binder for Foundry Molds
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Solution Overview
Problem
Current binder systems for foundry articles often contain health-hazardous organic solvents like formaldehyde and phenol, and can react prematurely with aggregates, leading to insufficient strength and poor quality casted materials.
Innovation Solution
A binder system comprising a first component of lignite and at least one silicate mineral with silica content, a second component of isocyanate, and a third component of catalyst, which are capable of polymerization and are substantially free of phenol and formaldehyde, along with a method of combining these components with an aggregate and curing with a catalyst to form foundry articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional binder systems containing organic solvents (formaldehyde and/or phenol) are used, then binding strength is achieved, but health hazards and environmental pollution increase
Solution Approach 1:
The patent removes harmful organic solvents (formaldehyde and phenol) from the binder system while retaining the essential binding functionality through a new chemical composition based on lignite, silicate minerals, and isocyanates
Solution Approach 2:
The invention changes the chemical parameters of the binder system by replacing traditional organic solvent-based binders with a water-based or solvent-free system using lignite and silicate minerals, fundamentally altering the chemical composition to eliminate harmful substances
2Ease of manufacture
If binder system components are mixed with aggregate, then foundry mixture is formed, but premature reaction occurs reducing workability
Solution Approach 1:
The binder system is divided into separate components that are mixed with the aggregate only when needed, preventing premature reactions and maintaining chemical stability during storage and handling
Solution Approach 2:
The patent introduces a catalyst as an intermediary substance that controls the timing of the chemical reaction, allowing the binder components to remain stable until the catalyst initiates the curing process
3Productivity
If conventional binder systems are used, then casting process is completed, but foundry articles have insufficient strength and poor quality
Solution Approach 1:
The invention creates a composite binder system combining lignite, silicate minerals, and isocyanates that work synergistically to produce foundry articles with superior strength and quality properties
Solution Approach 2:
The catalytic curing process accelerates the chemical reaction and bonding mechanism, resulting in faster setting times and enhanced strength development in the final foundry articles
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 provides a safer, environmentally friendly solution with improved curing properties and enhanced strength of foundry articles, reducing health hazards and increasing the quality of casted materials.
Implementation Method 1
the first component, the second component, and the third component may be capable of polymerization
Implementation Method 2
the at least one silicate mineral may comprise at least 5% by weight silica with respect to the total weight of the first component
Data Source
AI summary
The present disclosure includes binder systems for making foundry articles. The binder systems may comprise a humic substance-containing component that comprise lignite, an isocyanate component, and a catalyst component. The binder systems may be mixed with an aggregate (e.g., sand) for making foundry articles such as molds and cores. Also disclosed herein are methods of making foundry articles using the binder systems.