Rounded Zinc Peroxide Particle Manufacturing
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Solution Overview
Problem
Current methods fail to produce rounded zinc peroxide particles with an average diameter of 0.04 µm or more and aspect ratio of 2.0 or less, which are necessary for enhanced reactivity and applications such as cosmetics and heat releasing fillers, as finer particles tend to fuse during thermal decomposition.
Innovation Solution
A method involving the treatment of zinc oxide particles with an aqueous hydrogen peroxide solution, followed by calcination, to produce rounded zinc peroxide particles with a controlled average diameter and aspect ratio, utilizing a specific concentration range of hydrogen peroxide and zinc oxide, and subsequent thermal decomposition to achieve rounded zinc oxide particles with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If fine zinc peroxide particles are produced by conventional methods, then high specific surface area is achieved, but particle fusion occurs during thermal decomposition making shape/size control difficult
Solution Approach 1:
The invention changes the particle diameter parameter to 0.04 μm or more (specifically 0.05-10 μm), which is larger than conventional fine particles. This parameter change prevents particle fusion during thermal decomposition while maintaining sufficient surface area for reactivity, thereby resolving the contradiction between surface area and shape control precision
Solution Approach 2:
The invention performs preliminary action by controlling the particle diameter of zinc peroxide before thermal decomposition to zinc oxide. By pre-establishing the particle size in the range of 0.04 μm or more, the particles maintain their shape and size during the subsequent thermal decomposition process, preventing fusion and enabling precise shape control in the final zinc oxide product
2Manufacturing precision
If zinc peroxide particle diameter is increased to prevent fusion, then shape/size control during thermal decomposition improves, but a production method for such particles is unknown
Solution Approach 1:
The invention establishes specific parameter ranges for producing zinc peroxide particles: particle diameter of 0.04 μm or more (0.05-10 μm), aspect ratio of 2.0 or less, and controlled surface area. These parameter specifications provide a clear production target and methodology, making manufacture easier while achieving precise shape and size control
Solution Approach 2:
The invention uses zinc peroxide as an intermediary substance with controlled particle characteristics (diameter ≥0.04 μm, aspect ratio ≤2.0) that serves as a precursor for producing zinc oxide particles. This intermediary approach enables precise shape control in the final product while providing a manufacturable production path
3Reliability
If rounded zinc oxide particles with intermediate size (0.04-1.0 μm) are produced, then ultraviolet blocking performance and visible light transparency improve, but a fully established production method is unavailable
Solution Approach 1:
The invention specifies precise parameter ranges for zinc oxide particles: particle diameter of 0.04-1.0 μm (with D50 of 0.05-0.5 μm), aspect ratio of 2.0 or less, and rounded shape. These parameter definitions enable production of particles with optimized ultraviolet blocking and visible light transparency while providing a clear manufacturing guideline
Solution Approach 2:
The invention performs preliminary action by first producing rounded zinc peroxide particles with controlled diameter (0.04 μm or more) and aspect ratio (2.0 or less), then thermally decomposing them to zinc oxide. This preliminary shape control ensures the final zinc oxide particles maintain the desired rounded morphology and size distribution for optimal optical properties
4Reliability
If zinc peroxide particles with large particle diameter are produced, then reactivity control becomes possible, but conventional methods only produce fine particles
Solution Approach 1:
The invention changes the particle diameter parameter to 0.04 μm or more (specifically 0.05-10 μm), enabling reactivity control through surface area management. This parameter change allows arbitrary control of zinc peroxide reactivity (oxidizing power and photocatalytic activity) while maintaining manufacturing precision through the specified aspect ratio constraint of 2.0 or less
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 effectively produces rounded zinc peroxide and zinc oxide particles with enhanced ultraviolet blocking performance, transparency, and heat releasing efficiency, suitable for cosmetics and heat releasing fillers due to their uniform size and shape.
Implementation Method 1
treating zinc oxide particles with hydrogen peroxide
Implementation Method 2
calcination, to produce rounded zinc peroxide particles
Data Source
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Figure 3
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AI summary
An object of the present invention is to provide rounded zinc peroxide particles having a large particle diameter, the rounded zinc peroxide particles having excellent performance because they have an average particle diameter of 0.04 µm or more, a small aspect ratio and a shape close to a spherical shape; rounded zinc oxide particles which are obtained by calcinating the rounded zinc peroxide particles and which have a small aspect ratio and a sharp particle size distribution; a method for production thereof; and a cosmetic and a heat releasing filler each containing the rounded zinc oxide particles. Provided are rounded zinc peroxide particles having an average particle diameter of 0. 04 µm or more and an aspect ratio of 2.0 or less, and rounded zinc oxide particles which are obtained by thermally decomposing the rounded zinc peroxide particles and which have an average particle diameter of 0.04 µm or more and an aspect ratio of 2.0 or less.