Aliphatic Polymer Binder Etherification for Metal Casting
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Solution Overview
Problem
Current binders used in metal casting, both organic and inorganic, fail to provide a balance of high initial and final strength, heat resistance, moisture resistance, clean surface finish, low heat energy uptake, and minimal emissions, leading to issues like sink hole formation and hazardous fumes during metal casting.
Innovation Solution
A process involving an aliphatic polymer with hydroxy groups that undergoes etherification, combined with a refractory base mould material and heat-labile acid precursors, to create a cured shaped part with improved mechanical and thermal properties, and reduced emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional organic or inorganic binders are used in metal casting, then the shaped parts can be produced with sufficient initial strength, but the final strength, heat resistance, and moisture resistance are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the binder by using aliphatic polymers with hydroxy groups that undergo etherification crosslinking. This chemical transformation enables the binder to achieve high final strength, heat resistance, and moisture resistance simultaneously, resolving the contradiction between initial strength and final performance properties.
Solution Approach 2:
The patent creates a composite binder system combining aliphatic polymer chains with etherification crosslinks. This composite structure provides both the initial strength needed for handling and the final strength, heat resistance, and moisture resistance required for high-quality metal casting, eliminating the trade-off between different performance requirements.
2Strength
If conventional binders are used to achieve high strength, then the shaped parts can maintain structural integrity, but heat energy uptake increases causing sink hole formation
Solution Approach 1:
The patent changes the thermal parameters of the binder through etherification crosslinking, which creates a more thermally stable network. This reduces the heat energy uptake during metal casting while maintaining high casting strength, preventing sink hole formation and improving overall casting quality.
3Reliability
If conventional binders are used to achieve adequate performance, then the shaped parts can be produced, but hazardous emissions and fumes are generated during casting
Solution Approach 1:
The patent changes the chemical composition parameters by selecting aliphatic polymers with hydroxy groups as the binder base. These polymers, when etherified, produce minimal hazardous emissions and fumes during metal casting, improving workplace safety and environmental performance while maintaining reliable casting quality.
4Ease of manufacture
If the mould material mixture has high moisture content for ease of shaping, then the mixture is easier to form, but dimensional stability deteriorates
Solution Approach 1:
The patent changes the rheological parameters of the binder system through etherification, which modifies the water-polymer interaction. This allows the mould material mixture to maintain good shaping characteristics while achieving sufficient dimensional stability, as the crosslinked network provides structural support even at moderate moisture contents.
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 process produces shaped parts with high final strength, heat resistance, and moisture resistance, minimizing sink hole formation and emissions, and facilitating easy disintegration after casting, thus enhancing metal casting quality and safety.
Implementation Method 1
an aliphatic polymer which comprises structural units containing hydroxy groups and has been crosslinked by etherification
Implementation Method 2
heating of the shaped mould material mixture so that heat-labile acid precursors present in the mould material mixture decompose with liberation of acid
Implementation Method 3
removal of water from the heated shaped mould material mixture
Data Source
AI summary
A process (i) for producing a metal casting or (ii) for producing a cured shaped part for use in the casting of metallic castings is described. Furthermore, the use of an aliphatic polymer which comprises structural units containing hydroxy groups and has been crosslinked by etherification as binder of a shaped part for use in the casting of metallic castings is described. A shaped part for use in the casting of metallic castings, comprising at least one base mould material and a cured binder comprising or consisting of an aliphatic polymer which comprises structural units containing hydroxy groups and has been crosslinked by etherification, is likewise described. In addition, a cured shaped part which is producible by a process according to the invention and also a mould material mixture for use in the process of the invention are described.