Phenolic Resin Apolar Solvent Compatibility
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Solution Overview
Problem
The polyurethane cold box process faces challenges with phenolic resin and isocyanate binder systems due to differences in polarity, limiting solvent compatibility and leading to emissions of harmful aromatic solvents, which are difficult to capture and reduce.
Innovation Solution
A phenolic resin with specific structural units that exhibit high miscibility with apolar solvents like alkyl silicates, allowing for the elimination of organic polar solvents and the use of apolar solvents that are also effective for isocyanates, thereby reducing or eliminating aromatic solvent emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If phenolic resin is dissolved in polar organic solvents to achieve homogeneous mixing, then mixing homogeneity is improved, but harmful emissions increase due to aromatic solvent evaporation
Solution Approach 1:
The patent changes the solvent polarity parameter from polar organic solvents to apolar solvents (alkyl silicates), fundamentally altering the solvent system to eliminate aromatic emissions while maintaining mixing homogeneity through the specific phenolic resin structure
Solution Approach 2:
The patent converts the previously harmful aromatic polar solvents into beneficial apolar solvents (alkyl silicates) that are compatible with both phenolic resin and isocyanate, transforming an emission problem into a solution that improves binder system compatibility
2Object-generated harmful factors
If phenolic resin concentration is increased to reduce solvent content, then solvent emissions are reduced, but viscosity increases making mixing difficult
Solution Approach 1:
The patent changes the solvent type parameter to apolar alkyl silicates with specific molecular structures that provide low viscosity even at high phenolic resin concentrations, enabling easy mixing while minimizing solvent content and emissions
Solution Approach 2:
The patent creates a composite solvent system using alkyl silicates that combine the properties of low polarity (for isocyanate compatibility) with low viscosity (for easy mixing), achieving both reduced emissions and improved operability
3Object-generated harmful factors
If apolar solvents are used to eliminate aromatic emissions, then harmful emissions are reduced, but solvent compatibility with phenolic resin is limited
Solution Approach 1:
The patent changes the phenolic resin molecular structure parameters by introducing specific structural units that enhance compatibility with apolar solvents, expanding the range of usable apolar solvents while maintaining emission reduction benefits
Solution Approach 2:
The patent makes the apolar solvent system universally compatible with both phenolic resin and isocyanate components, allowing a single solvent type to fulfill multiple functions: dissolving phenolic resin, mixing with isocyanate, and eliminating aromatic emissions
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 phenolic resin achieves improved solubility and miscibility with apolar solvents, enabling the production of binder systems without polar organic solvents, reducing emissions, and enhancing the properties of the resulting articles with high initial strength and elasticity.
Implementation Method 1
the two components, added separately to the molding material mixture comprising a mold base material, react in an addition reaction to form a cured polyurethane binder
Implementation Method 2
the phenolic resins of the phenolic resin component to be dissolved in a solvent, since otherwise there is no possibility for further processing
Implementation Method 3
This curing takes place in the presence of basic catalysts, preferably in the form of tertiary amines
Data Source
AI summary
The present invention relates to a phenolic resin for use in the phenolic resin component of a two-component binder system for the polyurethane cold box process, to a two-component binder system for use in the polyurethane cold box process, to a molding material mixture for curing by contacting with a tertiary amine, to the use of a corresponding phenolic resin, of a corresponding phenol component, of a corresponding two-component binder system or of a corresponding molding material mixture. The present invention relates, moreover, to an article from the group consisting of feeders, foundry molds and foundry cores, producible from a corresponding molding material mixture, to a process for preparing a phenolic resin, and to a process for producing an article from the group consisting of feeders, foundry molds and foundry cores.