Solid Drawing Material Gel Network Strength
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Solution Overview
Problem
Conventional solid drawing materials, such as wax-based crayons and pastels, suffer from issues like surface contamination, difficulty in applying to wide areas, fragility, and poor draw feeling, while aqueous gel sticks are weak and prone to breaking, leading to increased drawing resistance and shavings.
Innovation Solution
A solid drawing material composed of an alkali metal or ammonium salt of an aliphatic carboxylic acid, an alkoxylated nitrogen-containing compound, and a reduced starch saccharide, which is heated and cooled to form a strong, flexible stick with low drawing resistance, suitable for smooth surfaces and easy cleanup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the ratio of blending soap (alkali metal salt) is increased to improve hardness, then hardness increases, but flexibility decreases and the stick becomes prone to breaking
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific gel-forming substance (ammonium salt of aliphatic carboxylic acid with 8-36 carbon atoms) and controlling the ratio of blending soap within 1-20% by weight. This parameter optimization allows achieving both hardness and flexibility simultaneously, resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite material system combining gel-forming substance, blending soap, and reduced starch saccharide in specific proportions. This composite approach enables the material to exhibit both hardness (from the structured gel network) and flexibility (from the starch component), eliminating the trade-off present in conventional single-component systems.
2Strength
If soap is blended to increase hardness, then hardness improves, but smooth draw feeling is impaired and shavings are produced
Solution Approach 1:
The patent optimizes the chemical composition by limiting the soap content to 1-20% by weight and introducing reduced starch saccharide (5-30% by weight) as a plasticizer. This parameter adjustment ensures the material maintains hardness while preserving smooth draw feeling and minimizing shavings during use.
Solution Approach 2:
The reduced starch saccharide acts as an intermediary substance that mediates between the hardness-providing gel-forming substance and the smoothness requirement. It forms a gel network that provides structural integrity while maintaining a smooth surface texture for easy drawing without excessive shavings.
3Strength
If gel-forming substance is increased to improve stick strength, then strength increases, but fluidity of sol decreases making molding difficult
Solution Approach 1:
The patent optimizes the concentration of gel-forming substance to 1-20% by weight and introduces reduced starch saccharide (5-30% by weight) as a fluidity-enhancing component. This parameter balance ensures the material has sufficient strength when solidified while maintaining adequate fluidity during the molding process for easy production.
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 exhibits high bending strength, reduced shavings, and easy erasability, allowing smooth drawing on surfaces like windowpanes, with washable properties and suitability for use by children and in decorative applications.
Implementation Method 1
aqueous gel sticks have been proposed by using an alkali metal salt or an ammonium salt of an aliphatic carboxylic acid as a gelling agent
Implementation Method 2
the reduced starch saccharide is obtained by decomposing a starch with an enzyme followed by reduction by hydrogenation
Data Source
AI summary
A solid drawing material containing a gel-forming substance of an alkali metal salt or an ammonium salt of an aliphatic carboxylic acid having 8 to 36 carbon atoms, an alkoxylated nitrogen-containing compound, a reduced starch saccharide, and a coloring agent. The solid drawing material which is in the form of a stick features a large strength, a small drawing resistance, is less subject to be collapsed or broken, produces little shavings while drawing, makes it possible to favorably form a drawing even on smooth surfaces such as windowpanes, and of which the traces after drawn can be easily wiped out with a wet cloth.