Magnesium Hydroxide Hydration for Polymer Flame Retardancy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing magnesium hydroxide for flame retardant applications are often energy-intensive, time-consuming, and raise environmental concerns due to the use of strong acids, extended hydration processes, and the need for additives and by-product handling, which complicate production and increase costs.
Innovation Solution
A method involving the hydration of magnesium oxide at high temperatures and pressures, followed by drying and milling, to produce magnesium hydroxide with a specific surface area between 0.1 and 25 m2/gr, suitable for mixing with polymers and inducing flame retardant properties without the need for additives or extensive particle size control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnesium hydroxide with high specific surface (above 13 m2/gr) is produced, then flame retardant properties are improved, but mixing with polymers becomes difficult and viscosity increases
Solution Approach 1:
The patent controls the specific surface of magnesium hydroxide within the range of 3-13 m2/gr by adjusting hydration conditions (temperature, pressure, time) and using specific magnesium oxide precursors with controlled particle size and crystallinity. This parameter optimization ensures both adequate flame retardancy and easy processability in polymer matrices.
2Productivity
If wet-pulverizing is extended to improve hydration rate, then reaction completeness is improved, but particle surface uniformity deteriorates and flame retardant crystal structures are compromised
Solution Approach 1:
The patent performs preliminary classification of magnesium oxide particles to ensure uniform size distribution before hydration. This preliminary action prevents over-pulverization during hydration and maintains particle surface uniformity while achieving complete reaction through controlled hydration conditions.
Solution Approach 2:
The patent uses intermittent or periodic pulvingizing during hydration rather than continuous extended pulvingizing. This periodic action allows crystal structure recovery between pulvingizing cycles, maintaining flame retardant properties while ensuring complete hydration.
3Manufacturing precision
If leaching with strong acids and spray roasting are used to produce high purity magnesium hydroxide, then purity is improved, but energy consumption and process complexity increase
Solution Approach 1:
The patent extracts and removes impurity-containing phases during the calcination process by controlling temperature and residence time, allowing impurities to be separated as distinct phases that can be easily removed by classification. This avoids the need for energy-intensive acid leaching and spray roasting while achieving high purity magnesium hydroxide.
4Length of moving object
If hydrothermal treatment at elevated temperature and pressure is used to reduce particle size, then particle size is improved, but retention time in autoclave must be extended
Solution Approach 1:
The patent performs preliminary size reduction of magnesium oxide particles before hydrothermal treatment. By starting with smaller precursor particles, the hydrothermal treatment achieves the desired final particle size in much shorter retention time, avoiding the need for extended autoclave processing.
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
This approach enables the efficient production of magnesium hydroxide with desired properties for polymer mixing, reducing energy consumption and environmental impact while achieving high purity and flame retardancy without the need for additives or extensive processing steps.
Implementation Method 1
hydrating a magnesium oxide containing material at high temperatures and pressures, resulting in a magnesium hydroxide containing material
Data Source
AI summary
The current invention relates to a process for producing magnesium hydroxide. Said magnesium hydroxide is suitable for mixing with polymers and for inducing flame retardant properties in polymeric compounds. According to aspects of the invention a magnesium oxide containing material is hydrated at high temperatures and pressures. The hydroxide containing material can be further dried and milled.