Spray-Dried Hydrous Kaolin Clay Non-Redispersibility
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Solution Overview
Problem
Existing spray-dried kaolin clay products retain chemical agents like dispersants, making them redispersible in water, which is undesirable in certain applications and affects product properties.
Innovation Solution
A method involving mixing hydrous kaolin clay with ammonium polyacrylate or polyacrylic acid, ammonium hydroxide, and propanolamine to create a viscosity-stable slurry, followed by spray drying, which results in a spray-dried kaolin clay that is not substantially redispersible in water, maintaining the product's stability and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If chemical dispersants are used to reduce slurry viscosity and maintain stability, then the slurry becomes spray-dryable and stable, but the dried product retains the dispersants and becomes redispersible in water, which is undesirable
Solution Approach 1:
The patent extracts and removes the harmful dispersant components from the final dried product through a multi-step process involving chemical bleaching to remove iron and other contaminants, followed by extensive washing and filtration that eliminates residual dispersants while maintaining clay stability during processing
Solution Approach 2:
The patent changes the chemical parameters of the slurry by adjusting pH levels and using specific chemical agents during processing that modify the clay surface properties, transforming the clay from a state that retains dispersants to a state that is resistant to redispersibility while maintaining processability
2Reliability
If chemical agents are retained in the dried clay product, then the slurry maintains stability during processing, but the final product has unwanted redispersibility that negatively affects product properties
Solution Approach 1:
The patent applies preliminary chemical treatments during the slurry preparation and drying process that pre-modify the clay surface properties, ensuring that when the clay is dried, it has inherent resistance to redispersibility built into its structure rather than requiring post-processing modifications
Solution Approach 2:
The patent converts the potential harm of retained chemical agents into a benefit by using controlled chemical modifications during processing that create a stable dried product with desired non-redispersibility, transforming what could be a contaminant issue into a product quality feature
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 method produces a stable, non-redispersible spray-dried kaolin clay with controlled viscosity and pH, suitable for use in products like food packaging, while preserving existing production equipment and rates, and ensuring compliance with regulatory standards.
Implementation Method 1
spray drying the slurry to produce the spray-dried, hydrous, kaolin clay
Data Source
AI summary
A method of producing a spray-dried, hydrous kaolin clay is disclosed that includes mixing a hydrous kaolin clay with water, an ammonium polyacrylate or polyacrylic acid, ammonium hydroxide, and a propanolamine selected from the group consisting of 2-amino-2-methyl-1-propanol, 2-methylamino-2-methyl-1-propanol, 1-amino-2-propanol, or mixtures thereof, to produce a viscosity stable dispersed slurry, and spray drying the slurry to produce the spray-dried, hydrous, kaolin clay. A spray-dried, hydrous kaolin clay is also disclosed.