Granular Modeling Material With Cross-Linked Binder Coating
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Solution Overview
Problem
Existing modeling materials for play and educational purposes face challenges such as high adhesion to surfaces, lack of a pleasant granular structure, and susceptibility to bacterial growth, especially when used by children, due to their tacky nature and water absorption.
Innovation Solution
A material composition with a high concentration of particulate or granular material (90-98 vol.%) coated with a hydroxyl-terminated polymer cross-linked by a boron compound, where the binder is distributed as thin layers on the particles and cross-linked to maintain a granular structure while minimizing adhesion to surroundings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a high proportion of particles is included in the material to obtain a granular structure and increased volume, then the material becomes more mouldable and less tacky, but the material loses plasticity and requires heating to become workable again
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by specifying a viscosity range of 10-1000 Pas at 20°C and incorporating specific additives that affect the binder's properties. This allows the material to maintain its granular structure and mouldability without requiring heating cycles, as the binder's chemical composition is optimized to remain workable at room temperature.
Solution Approach 2:
The patent creates a composite material system combining particulate material (9-50 µm particles) with a specifically formulated binder containing multiple components including viscosity modifiers and additives. This composite structure maintains both the granular texture for mouldability and the chemical properties for sustained workability without thermal processing.
2Strength
If the binder has high adhesion to surrounding surfaces to ensure material integrity, then the material holds its shape well, but the material becomes tacky and difficult to handle
Solution Approach 1:
The patent applies local quality by creating a granular structure where individual particles are coated with binder, providing localized adhesion at particle interfaces while maintaining overall low tackiness. The binder is distributed as thin layers on particle surfaces rather than forming a continuous adhesive matrix, ensuring material integrity without excessive surface adhesion.
Solution Approach 2:
The high particle content (90-99 vol%) creates a porous structure with air gaps between particles. This porous architecture reduces the continuous binder phase, thereby reducing overall adhesion to surfaces while maintaining sufficient bonding between particles for material integrity.
3Ease of operation
If water-based materials are used for play purposes, then the material is easy to handle initially, but bacteria and contaminants grow during repeated use and liquid is absorbed
Solution Approach 1:
The patent changes the liquid component from water-based to an organic solvent system with specific viscosity characteristics (10-1000 Pas). This parameter change creates an environment less suitable for bacterial growth while maintaining the material's workability and handling properties throughout repeated use.
Solution Approach 2:
The patent formulates a binder system that does not require sterilization or special maintenance, effectively treating the material as a single-use or limited-use product that does not support contaminant growth. The chemical composition prevents bacterial proliferation, eliminating the need for cleaning or sterilization cycles.
4Ease of operation
If the material is designed to release readily from moulds to facilitate figure making, then the material is easy to demould, but the material lacks adhesion to surrounding surfaces when needed
Solution Approach 1:
The patent applies local quality by creating a granular structure where individual particles are coated with binder, providing localized adhesion at particle interfaces while maintaining overall low tackiness. The binder is distributed as thin layers on particle surfaces rather than forming a continuous adhesive matrix.
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 material composition is easily moldable, non-tacky, and resistant to bacterial growth, with a pleasant granular structure that does not adhere to surfaces, allowing for easy handling and figure molding without the need for reheating, and can be sterilized by heat to remove contaminants.
Implementation Method 1
the binder comprising a hydroxyl-terminated polymer cross-linked by a boron compound
Implementation Method 2
the binder is distributed as thin layers on the particles and cross-linked
Data Source
Figure 1
Figure 2
AI summary
A material composition for play or modelling purposes comprises a particulate material (2) and a binder (3) which is disposed as thin layers on the particles. The binder includes a hydroxy-terminated polymer cross-linked by a boron compound, in particular a silicon oil. According to the present invention, the concentration of particles (2) is 90-98 vol% of the finished composition. A method for producing the material composition comprises the steps that the particles (2) are placed in a mixer, that the hydroxyl-terminated polymer, in particular silicon oil, is added and distributed as thin layers on the surfaces of the particles and that thereafter a boron-containing cross-linking agent is added in solution and mixed so that a cross-linking of the polymer takes place and the viscosity increases.