Silica Powder Mold Release Agent for Core Strength
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Solution Overview
Problem
Aqueous mold release agents for cores with inorganic binders face challenges in maintaining core strength due to solvent penetration, and existing solutions fail to completely prevent this issue.
Innovation Solution
An inorganic mold release agent in powder form, specifically silica powder, is applied to the core surface without a solvent, combined with optional magnesium hydroxide powder to enhance adhesion and prevent molten metal sticking, thereby maintaining core strength and avoiding organic binder-related issues like tar and odor generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an aqueous mold release agent is applied to the core surface, then sand adhesion is prevented, but the core strength decreases due to solvent penetration
Solution Approach 1:
The patent extracts and removes the solvent component from the mold release agent formulation, transitioning from an aqueous solution to a pure powder form. This eliminates the harmful penetration effect while retaining the beneficial sand prevention function through the powder's surface coating action
Solution Approach 2:
The patent changes the physical state parameter of the mold release agent from liquid (aqueous solution) to solid (powder form). This parameter change fundamentally alters how the agent interacts with the core, preventing solvent penetration while maintaining release functionality
2Object-affected harmful factors
If an organic mold release agent is used to prevent sand adhesion, then sand sticking is reduced, but tar and soot are generated due to molten metal heat
Solution Approach 1:
The patent changes the chemical composition parameter of the mold release agent from organic compounds to inorganic powder (silica). This chemical parameter change eliminates the combustion reactions that produce tar and soot, while the powder's physical properties continue to prevent sand adhesion
Solution Approach 2:
The patent employs an inorganic powder material (silica) that combines the dual functionality of preventing sand adhesion through surface coating while remaining thermally stable and non-combustible, thus avoiding harmful emissions
Data Source
AI summary
An inorganic mold release agent for a core that is applied to a surface of a core containing an aggregate and an inorganic binder, and the mold release agent for a core is a powder containing silica powder, which is applied in a powder form to the surface of the core.