Aluminium Hydroxide Application

  “Chemical alumina” refers to the production of aluminum ingot except alumina, aluminum oxide and aluminum hydroxide differentiated products or extended products. There are hundreds of varieties of chemical alumina, and it has a wide range of applications in various fields. This article will introduce the related applications of aluminum hydroxide.

Aluminium hydroxide, also known as hydrated alumina, hydrous alumina, alumina hydrate, is a typical amphoteric compound, soluble in acids and bases, insoluble in water and alcohol. The general formula is Al2O3 • H2O with a melting point of 300 (loss of water). According to its water content, the aluminum hydroxide series can be divided into: alumina trihydrate, alumina monohydrate, low crystallinity alumina and amorphous aluminum hydroxide. Extracted from bauxite, it can also be made from aluminum salt and sodium hydroxide with ammonia water. There are two kinds of crystalline and amorphous (gel).

  Amorphous aluminum hydroxide are low alkali, low iron, fine particles, and high white. The utility model has the advantages of large hardness, heat resistance, wear resistance, good chemical stability, non-toxic, tasteless, non-volatile, dehydration and heat absorption when the utility model is heated to more than 250 DEG C, and has good smoke elimination and flame retardance. The main application areas are as follows.

  Aluminum hydroxide is a kind of purified inorganic filler, its impurity content is low, and the series of polymers that use aluminium hydroxide as filling agent are polyurethane resin, epoxy resin, polyethylene, polypropylene, styrene butadiene rubber, etc.. Aluminium hydroxide as an effective flame retardant and smoke suppressant has been used in unsaturated resin for many years.

The flame retardant mechanism for adding ATH to the polymer, reducing the fuel concentration; aluminum hydroxide started at 250 DEG C endothermic dehydration, inhibition of polymer temperature rise; decomposition of water vapor dilution of oxygen concentration, slow combustion; in generating combustible surface of alumina can prevent combustion reaction to continue.

  Aluminum hydroxide is mainly used in the coating industry for surface coatings, fillers, and non combustible paper. Aluminum hydroxide can improve the gloss, reflection, light resistance, smoothness and printability of the paper. Aluminium hydroxide can also be used as the raw material for coated paper, and titania will substitute for clay. Commonly used aluminum hydroxide particle size is 0.7-1.4 mu m.

  Fire retardant paper: flame retardant, fire carbonization, but not burning. Made of asbestos paper, or the flame retardant with the appropriate paper (such as aluminum hydroxide) and treatment.

  Aluminum hydroxide is non-toxic and tasteless, insoluble in water, is a good kind of neutral friction agent, toothpaste friction agent of industrial production of aluminum hydroxide Mohs hardness is 2.5-3.5, the purity of more than 99%, pH value 8.0-9.5, D50 value is 8-15 micron, the price is moderate, is a good toothpaste friction agent, fluoride and compatibility, excellent performance. Is one of the ideal drug toothpaste abrasives.

  Mullite (or mullite) is a series of minerals consisting of aluminosilicate. Mullite is the only stable two element compound in the Al2O3 SiO2 system. This type of mineral is relatively scarce. It is a kind of high quality refractory, and mullite can be formed by heating aluminium silicate artificially. Mullite is mainly used in refractories, ceramics, metallurgy, casting, electronics and other industries. It has the characteristics of high temperature resistance, high strength and small thermal conductivity.

In addition, aluminum hydroxide can be used as artificial marble, artificial agate, carpet filler; production of aluminum sulfate, alum, alumina, hydrated alumina, sodium aluminate chemical materials rubber products; flame retardant; used as filler and supplements of adhesives and sealants; synthetic molecular sieve; for gastricantiacids etc..

  Gel type aluminum hydroxide are Aluminium Hydroxide Gel, boehmite, amorphous alumina. It has good adhesive, molding, high temperature resistance, large heat capacity, low thermal conductivity, good corrosion resistance and oxidation resistance, high strength and smooth surface.

Aluminum hydroxide is one of the main ingredients of stomach aluminum gel is treatment of stomach and gastric acid, traditional medicine, compound preparations such as vitamin U and aluminium capsules, Aluminium Hydroxide Tablets and other major components, can also be used for medicinal materials. The mechanism of its anti gastric acid is Al (OH)3+6HCl=2AlCl3+3H2O. Six water alumina prepared from aluminium hydroxide can be used as a gelling agent in the field of medicine and cosmetics.

  Surface treatment and adhesive adhesive it Aluminium Hydroxide Gel use can be made of inorganic or organic fiber, using its high temperature resistance and surface finish, widely used in the manufacture of high-grade ceramic utensils, also used for electric porcelain manufacturing; at the same time it is also the inorganic filler.