Precipitated Aluminum Hydroxide

Precipitation aluminum hydroxide, with its excellent flame retardant properties, outstanding filling characteristics, and excellent environmental compatibility, is widely suitable for various fields such as rubber modification, papermaking fillers, ceramic raw materials, building materials, and flame retardant coatings.

Core strengths

1. Precise sedimentation process

-Ultra high purity: aluminum hydroxide content ≥ 99.9%, alkali metal oxide (Na₂O) ≤ 0.02%, iron (Fe) ≤ 0.0015%, silicon (SiO₂) ≤ 0.003%, no restricted impurities such as heavy metals and halogens, avoiding performance interference with downstream fine chemical products and high-end rubber products;

-Regular crystal structure: Through dynamic crystal structure control technology, the product forms a uniform hexagonal plate-like crystal structure with a diameter to thickness ratio of 10:1. The particle size distribution is concentrated (D50 can be precisely controlled within 1-10 μ m), without agglomeration or agglomeration. The dispersion uniformity in aqueous and oil phase systems is ≥ 98%;

-Low moisture and low salt attachment: The attached water content is ≤ 0.3%, the burn off rate is stable at 34.5% -35.5%, and there is no soluble salt residue, effectively avoiding defects such as bubbles, pinholes, and yellowing during downstream product processing, and improving the consistency of the appearance and performance of the finished product.

2. Efficient flame retardancy and smoke suppression performance

-Heat absorption, cooling and flame retardancy: The initial decomposition temperature is 225 ℃ (peak decomposition temperature is 285 ℃), which perfectly matches the process range of medium and low temperature processing substrates such as EVA, PVC, acrylic resin, etc. The unit mass heat absorption is as high as 1970J/g. During the decomposition process, it quickly absorbs combustion heat, releases steam to dilute combustible gases, and blocks the combustion chain reaction from the source;

-Physical barrier smoke suppression: The decomposed α-Al₂O₃ micro powder can form a continuous and dense inorganic protective layer on the surface of the substrate, blocking the transfer of oxygen and heat, while capturing free carbon particles generated by combustion. The smoke density ratio (SDR) is ≤ 68, and the smoke toxicity reaches GB/T 20284-2006 ZA1 level, far superior to traditional filler type flame retardants;

3. Multi substrate efficient compatibility

-Multi system adaptation: Hydrophilic modified products are suitable for water-based coatings, papermaking adhesives, and other water-based systems, with no settling or layering after dispersion; Hydrophobic modified products are suitable for oil phase systems such as rubber modification and oil-based coatings, forming stable entanglement with resin molecular chains and avoiding substrate brittleness under high filling conditions;

-Processing performance optimization: The modified product has a low oil absorption value of 15mL/100g, which is 28% lower than the unmodified precipitation ATH. It can significantly improve the melt flow rate (MFR) of composite materials by more than 48%, reduce equipment energy consumption and mold wear during extrusion, injection molding, and coating processes, and adapt to high-speed automated production lines;

-Improved weather resistance: The modified precipitated aluminum hydroxide has excellent resistance to moisture and UV aging. After being placed in a humid and hot environment at 85 ℃/85% RH for 2500 hours, its flame retardancy and mechanical properties show no significant degradation, making it suitable for long-term exposure scenarios such as outdoor building materials and photovoltaic auxiliary materials.

Application field

1. Rubber and plastic modification field

-Soft rubber and plastic products: used for EVA foam shoe materials, PVC floor leather, TPE sealing strips and other products. Adding 35% -45% can achieve UL94 V0 level flame retardancy, while retaining the softness and elasticity of the product. The elongation at break is ≥ 380%, and there is no phenomenon of separation;

-Hard rubber products: used for PP pipes, PE sheets, ABS home appliance shells and other products, with an addition amount of 40% -50%, a flame retardant rating of UL94 V0, and a mechanical property retention rate of ≥ 92%. It can replace some expensive flame retardants and reduce formulation costs;

-Special rubber products: used for silicone rubber cable sheaths, fluororubber seals and other products, with low impurity characteristics to ensure the insulation performance and high and low temperature resistance of the products. The performance is stable in an environment of -50 ℃ -200 ℃, suitable for aerospace, military and other fields.

2. Paper making and coating industry

-High end coated paper: used as a coating pigment in the production of copperplate paper and thermal paper. The ultra-fine precipitated aluminum hydroxide has a whiteness of ≥ 98.5% and good dispersibility, which can improve the smoothness, glossiness, and printing suitability of the paper, while endowing the paper with certain flame retardant properties;

-Special functional paper: used for the production of flame-retardant wallpaper and fire-resistant filter paper, with an added amount of 20% -30%.

3. In the field of coatings and adhesives

-Environmentally friendly flame retardant coating: used in the production of water-based fireproof coatings and oil-based industrial coatings. Hydrophilic/hydrophobic modified products can be adapted to water oil systems separately, with an addition amount of 30% -40%. The flame retardant rating of the coating reaches Class A, with excellent weather resistance and no heavy metal pollution;

-Functional adhesive: used in the production of epoxy resin adhesive and polyurethane adhesive. High purity precipitated aluminum hydroxide can enhance the adhesive strength and heat resistance of the adhesive, while endowing the adhesive with flame retardant properties, suitable for electronic device packaging, building structure bonding and other scenarios;

-Ink filler: Used for the production of environmentally friendly ink, ultra-fine products have good dispersibility, which can improve the coloring power and printing clarity of ink, while reducing the VOCs content of ink, in line with green printing standards.

Frequently Asked Questions

Q1: What is the difference between precipitated aluminum hydroxide and natural aluminum hydroxide?

A1: Distinction: ① Purity: The purity of the precipitation method product is ≥ 99.9%, and the impurity content is extremely low; The purity of natural aluminum hydroxide is mostly between 95% and 98%, with high impurity content; ② Crystal structure: The precipitation method produces products with regular crystal structure and uniform particle size distribution; Natural products have irregular crystal structures and are prone to aggregation; ③ Performance: The precipitation method has good dispersibility, stable flame retardant performance, and high yield of downstream products; The performance of natural products fluctuates greatly, which can easily affect the quality of the products

Q2: How to determine the amount of precipitated aluminum hydroxide added in different fields?  

A2: Conventional reference: ① EVA rubber modification: 35% -50%; ② High end coated paper: 10% -20%; ③ Water based fireproof coating: 30% -40%; ④ Ceramic body: 5% -15%.

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