Inorganic flame retardants have relatively good thermal stability, do not produce corrosive gases and toxic gases, and have less impact on the environment. Compared with organic flame retardants, inorganic flame retardants are more in line with environmental protection and fire safety requirements. Inorganic flame retardants have also been the focus of research in recent years and have huge market potential.
Inorganic flame retardants include aluminum hydroxide, magnesium hydroxide, magnesium oxide, antimony trioxide, sodium tetraborate, etc. Among them, aluminum hydroxide is the most widely used inorganic flame retardant. It has flame retardant, smoke elimination, and filling properties. Function, especially surface-modified ultrafine aluminum hydroxide, can also improve the mechanical properties of the material.
Although brominated flame retardants among organic flame retardants have the advantages of high flame retardant efficiency, low addition amount, and wide application range, in order to comply with the development trend of high flame retardancy, low smoke, and harmlessness in the flame retardant market, inorganic flame retardants The development and utilization of flame retardants has gradually received more support.
Ultrafine aluminum hydroxide has stable physical and chemical properties at room temperature, does not produce secondary pollution when burned, has high whiteness and excellent chromaticity indicators. And nano-aluminum hydroxide can not only improve the limited oxygen index of flame-retardant polymers and increase flame-retardant properties, but also help improve the surface finish and mechanical and electrical properties of polymer products, and enhance their resistance to leakage, arc resistance and wear resistance. ability. In addition, the combined use of aluminum hydroxide and other flame retardants has an ideal effect, and it is an inorganic flame retardant with broad prospects.
The flame retardant mechanism of aluminum hydroxide is relatively complex and consists of the following synergistic mechanisms:
1) The reaction is endothermic
As we mentioned above, aluminum hydroxide reacts with heat to form aluminum oxide and water. This reaction is an endothermic reaction, and the reaction formula is:
Excellent performance makes aluminum hydroxide perform well in many industries. But when it is used in different industries, it often has different requirements for quality.
EVA foam material
EVA foam material refers to a foam insulation material made of EVA and low-density polyethylene as raw materials, adding other additives and then molded foaming or injection foaming. Because it is relatively good for the environment, it is widely used indoors and in public places, so it has high requirements for flame retardant performance.
The flame retardant system of EVA foam materials generally uses a single aluminum hydroxide, with an added amount of about 60%. Due to the large amount of addition, there are strict requirements for its stability, stable pH, and the product must not have a trace of impurities. This makes the production process of aluminum hydroxide very strict and the price is higher than other nano-level products.
Silicone rubber products
The special aluminum hydroxide flame retardant for silicone needs to add a variety of silane surface treatments to screen out coarse particles and remove impurities so that the powder can be combined with the silicone rubber as well as possible without affecting the mechanical properties. It also serves as both flame retardant and filling. effect. In addition, aluminum hydroxide can be used alone or in combination with nitrogen-phosphorus flame retardants. The specific proportion needs to be added according to the formula.
Ink and paint are both important printing materials. The former is mainly used in the printing industry, and the latter has both protective and decorative functions. There is no obvious boundary between the two. The requirements for aluminum hydroxide flame retardants are basically the same, that is, they need to have low oil absorption, no impurities, high whiteness, and no precipitation.
The Chinese name of TPU is thermoplastic polyurethane elastomer. It has excellent high tension, high pull force, strength and aging resistance. It is a mature environmentally friendly material. The aluminum hydroxide added to TPU/TPE materials must first have a particle size below 2.0 microns and a uniform particle size distribution, which can better integrate with other materials and improve the material’s wear resistance and tear resistance.
Secondly, it is necessary to perform surface activation treatment on aluminum hydroxide so that aluminum hydroxide can form a good link with other substances. At the same time, it also enhances the processing fluidity of aluminum hydroxide so that aluminum hydroxide can be more evenly distributed into the material. Produce good flame retardant effect.
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