Preparation Process: Ultra-Fine Aluminum Hydroxide Flame Retardant

Preparation Process: Ultra-Fine Aluminum Hydroxide Flame Retardant

Process Composition:

1. Raw Material Preparation

Prepare the raw materials and conduct quality inspection of the aluminum hydroxide.

2. Solvent Addition

Spray a solvent solution to coat the surface of the aluminum hydroxide, altering its surface properties. Conduct a quality inspection of the aluminum hydroxide after solvent addition. Note: The added solvent solution is a mixture such as water, grinding aids, or dispersants. During the solvent addition process, control the moisture content of the aluminum hydroxide to between 1% and 12%.

3. Vertical Mill Preparation

Start the vertical mill, increase the air temperature inside the mill, and adjust the grinding pressure of the grinding roller. Note: The grinding pressure of the rollers is between 6 and 12 MPa.

4. Vertical Mill Grinding

Feed the aluminum hydroxide with added solvent solution uniformly and continuously into the grinding chamber of the vertical mill via a feeding device. Maintain temperature and humidity during grinding, and add solvent solution at appropriate intervals during the process to improve the dispersibility of aluminum hydroxide particles of different sizes and their mixing performance with the solvent. Mechanical force and friction gradually refine the powder particles. Note: The added solvent solution is a mixture such as water, grinding aids, or dispersants. During the solvent addition process, control the moisture content of the aluminum hydroxide to between 1% and 12%.

5. Powder Classification

The aluminum hydroxide powder after vertical mill grinding is classified by a classification system to separate ultra-fine aluminum hydroxide particles meeting the requirements. Coarse particles are returned to the mill for further grinding.

6. Hot Steam Drying

The ground and classified aluminum hydroxide powder is dried using hot steam to improve crystal structure and performance, yielding the finished ultra-fine aluminum hydroxide flame retardant. Note: The heating temperature for hot steam drying is controlled between 60 and 120°C.

7. Subsequent Processing

The dried ultra-fine aluminum hydroxide flame retardant undergoes further sieving via an air flow sieve to remove particles that do not meet the particle size requirements, ensuring a uniform particle size distribution of the product.

8. Product Packaging

Conduct quality inspection of the ultra-fine aluminum hydroxide flame retardant. Perform sealed packaging operations for the qualified ultra-fine aluminum hydroxide flame retardant. Primary Functions: Solvent Addition: Spraying the solvent solution to coat the aluminum hydroxide surface alters its surface properties, and quality inspection is conducted afterward.

9. Vertical Mill Treatment

Increasing the air temperature inside the vertical mill helps improve grinding efficiency and reduce energy consumption. Adjusting the grinding roller pressure according to the raw material properties and desired product particle size, within the range of 6 MPa to 12 MPa, achieves optimal grinding results.

Utilizing the efficient grinding and crushing principles of the vertical mill, it can quickly crush and grind raw aluminum hydroxide into ultra-fine powder. Vertical mill technology significantly enhances production efficiency, shortens the production cycle, thereby reducing production costs. Vertical mill equipment typically features a closed design, resulting in a production process with no wastewater or exhaust gas emissions. This minimizes the discharge of wastewater, dust, and exhaust gases, reducing environmental pollution. Furthermore, advanced grinding and classification technologies contribute to lower energy consumption, aligning with current green and low-carbon production trends.

Summary

From "spraying - vertical milling - classification - low-temperature steam drying," this seamless, closed-loop green process propels aluminum hydroxide into the micrometer to sub-micrometer range while simultaneously driving energy consumption and dust emissions to new lows. When the ultra-fine powder is uniformly dispersed within the resin, a low-smoke, non-toxic, low-cost halogen-free flame retardant solution is instantly formed. This provides downstream applications like wires and cables, automotive interiors, and electronic packaging with a dual guarantee of "safety + environmental protection."