Mold Material with Silicone Resin Coating for Casting
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Solution Overview
Problem
Existing mold materials face challenges with fluidity, strength, mold-releasability, collapsibility, and sand adhesion issues during the casting process, particularly with the use of organic binders leading to gas deficiencies and environmental concerns, while inorganic binders suffer from poor collapsibility and moisture absorption.
Innovation Solution
A mold material comprising a refractory aggregate, a water-soluble inorganic binder with low viscosity, and spherical silicone resin particles with binder-repellency, which improves fluidity, strength, and mold-releasability, and reduces sand adhesion by forming a coated sand in a wet state with the spherical particles on its surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If organic binder is used to form coated sand, then mold strength is improved, but fluidity deteriorates and gas deficiency occurs during casting
Solution Approach 1:
The invention changes the fundamental parameter of binder chemistry from organic to inorganic (water glass), eliminating carbon-containing compounds that generate harmful gases and odors during casting, while maintaining mold strength through inorganic binder mechanisms
Solution Approach 2:
The invention introduces metal oxide particles (silicon dioxide, aluminum oxide, titanium oxide, or zinc oxide) that act as catalysts and oxidizing agents to accelerate the drying and curing processes, enabling complete evaporation of water and organic additives without residual gas generation
2Object-generated harmful factors
If inorganic binder is used to form coated sand, then gas emission is reduced, but collapsibility and moisture resistance deteriorate
Solution Approach 1:
The invention creates a composite binder system combining water glass (inorganic binder) with metal oxide particles, where the metal oxide components compensate for the weaknesses of pure inorganic binders by providing enhanced collapsibility and moisture resistance while maintaining the gas-free advantage
Solution Approach 2:
The metal oxide particles serve as intermediary substances between the inorganic binder and the aggregate, mediating the interaction to improve collapsibility and moisture resistance without compromising the inorganic binder's gas-free properties
3Strength
If water glass binder is used with metal oxide particles, then mold strength is improved, but mold-releasability deteriorates due to increased adhesion
Solution Approach 1:
The invention applies metal oxide particles selectively to modify the local adhesion characteristics at the binder-aggregate interface, creating zones of controlled adhesion that maintain overall mold strength while reducing excessive bonding that causes release problems
Solution Approach 2:
The invention uses a controlled amount of metal oxide particles (not excessive) to achieve the optimal balance between adhesion for strength and reduced adhesion for releasability, avoiding both insufficient and excessive bonding
4Productivity
If binder viscosity is reduced to improve fluidity, then filling rate is improved, but binder distribution becomes uneven and mold-releasability deteriorates
Solution Approach 1:
The metal oxide particles act as intermediaries that modify the rheological properties of the water glass binder, allowing it to maintain optimal viscosity for both fluidity during filling and uniform distribution after filling, while preventing excessive adhesion that would harm releasability
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 solution enhances the filling rate, strength, and collapsibility of the casting mold, while preventing sand adhesion and improving the casting surface quality, thereby addressing the limitations of both organic and inorganic binder-based materials.
Implementation Method 1
spherical particles of silicone resin having binder-repellency
Data Source
AI summary
Provided are: a mold material having improved fluidity and being capable of improving a filling rate of a forming mold during formation of a casting mold; and a mold material that gives cast products a favorable casting surface, effectively improves sand adhesion on cast products, and advantageously provides a casting mold having excellent strength. The mold material is formed as a coated sand in a wet state with spherical particles of silicone resin having binder repellency existing on its surface, by at least mixing a water-soluble inorganic binder in the liquid state having a viscosity of not more than 1000 cP, and the spherical particles of silicone resin, with a refractory aggregate.