Thixotropic Composition Stability and Sprayability via Composite Gel Network
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Solution Overview
Problem
Existing thixotropic compositions face challenges in maintaining stability and suspending high-density particles over long periods without separation or precipitation, and they are not easily sprayable when diluted.
Innovation Solution
A thixotropic composition comprising microcrystalline cellulose, a swelling or water-binding agent (such as mica), starch glycolate, and carboxymethyl cellulose or its alkaline salt, with a high water content, which allows for the suspension of high-density particles and maintains stability even when diluted, and is suitable for spraying due to its rheological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If existing thixotropic compositions are used to suspend high-density particles, then particle suspension is achieved, but stability over long periods is poor due to separation and precipitation
Solution Approach 1:
The patent applies composite materials by combining microcrystalline cellulose with carboxymethyl cellulose and a swelling agent in specific weight ratios (microcrystalline cellulose:carboxymethyl cellulose:swelling agent = 3:1 to 11:1, and cellulose mixture:swelling agent = 3:1 to 4:1). This composite structure creates a synergistic effect where the swelling agent expands to form a three-dimensional network that traps particles, while the cellulose components provide structural support and thixotropic properties, resulting in enhanced long-term suspension stability without particle precipitation.
Solution Approach 2:
The patent utilizes parameter changes by controlling the water content at high levels (70-95 wt.%, preferably 80-95 wt.%) and adjusting the specific weight ratios of components. The high water content allows the swelling agent to充分 expand and form a stable gel network, while the optimized ratios ensure proper balance between thixotropic strength and suspension capability, preventing particle separation over time.
2Ease of operation
If thixotropic composition is diluted for spraying application, then sprayability is improved, but stability and particle suspension are lost
Solution Approach 1:
The patent applies preliminary action by pre-forming a stable thixotropic gel network using the swelling agent and cellulose combination before dilution. This pre-established three-dimensional structure remains intact even after dilution, allowing the composition to maintain its particle suspension capability and stability while achieving sprayability through controlled thinning. The gel network acts as a scaffold that prevents particle precipitation regardless of the final concentration.
3Reliability
If high concentration of cellulose is used to maintain stability, then particle suspension is improved, but viscosity increases and sprayability decreases
Solution Approach 1:
The patent uses the swelling agent as an intermediary that mediates between the cellulose components and the water phase. The swelling agent absorbs water and expands to form a gel network that suspends particles, while allowing the continuous phase to remain sufficiently fluid for spraying. This intermediary structure enables particle suspension at lower effective cellulose concentrations, maintaining sprayability while achieving stability.
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 composition maintains stability and prevents separation or precipitation of high-density particles over extended periods, enabling it to be used in cosmetics, medical creams, and other applications, and can be effectively sprayed with a uniform distribution of particles, making it suitable for various industrial and medical uses.
Implementation Method 1
colloidal microcrystalline cellulose being dispersed in water forms thixotropic gels
Implementation Method 2
a swelling or water-binding agent (such as mica)
Data Source
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AI summary
The invention concerns a thixotropic composition comprising a microcrystalline cellulose, a swelling or water binding agent, a starch glycolate, a solvent and carboxymethyl cellulose or its alkaline salt or its alkaline earth metal salt, wherein the swelling or water binding agent is a phyllosilicate, wherein the solvent comprises water.