Preparation of inorganic flame retardant plastic and progress presentation

Flame retardant polymer materials for fire-retardant treatment, combustion of materials can prevent or delay the spread of fire. According to chemical composition, flame retardants can be divided into inorganic and organic flame retardants. Currently, the general price highest halogen-containing flame retardants, but its flame-retardant, high efficiency, with less, such as brominated flame retardants generally only fill 18% to 20% [1]. Inorganic hydrates least expensive, but less than the polymer material of absorbing heat of the combustion heat, in order to achieve the desired flame retardant effect, there must be a large amount of filler. There are reports that the most cost effective flame retardants are halogen-containing flame retardants and Mg (OH) 2 inorganic hydroxide flame retardants. Halogen-containing flame burning often emit toxic or corrosive gases, there are certain risks. Inorganic flame retardants include antimony, aluminum, phosphorous, boron and so on. The biggest advantage of inorganic flame retardant and low toxicity, low smoke or smoke suppression, low corrosion, and low prices. At present, many domestic and foreign research and application of new inorganic flame retardants, mainly magnesium hydroxide and aluminum hydroxide and antimony pentoxide, etc., especially magnesium hydroxide is most important. flame retardant
Magnesium hydroxide and method in the early 1980s, Japan, Israel, France, the United States and other developed countries to invest more human and material resources to carry magnesium hydroxide-depth study of various production methods, and have set up factories to obtain good economic and social benefits. In the late 1980s, China began to carry out a number of units have fire retardant magnesium hydroxide and aluminum hydroxide process research work, and use them to gradually replace the traditional flame retardants may be used, achieved the desired flame retardancy. To the late 20th century, particularly for electrical materials, fiber optic communication materials and other special purpose nanometer magnesium hydroxide successful development of new inorganic flame retardants is the exclusive chelating head. Magnesium hydroxide flame retardant properties superior to aluminum hydroxide, mainly reflected in the following aspects [11]: smoke suppression capabilities far superior to aluminum hydroxide. Magnesium hydroxide in terms of sources of raw materials, the preparation process, waste disposal, etc. are green flame retardants; than aluminum hydroxide have a wider range of applications. At the same time the decomposition of magnesium hydroxide to (1.37kJ / g) than the decomposition of aluminum hydroxide to (1.17kJ / g) is high, and 7% higher heat capacity, which helps to improve flame retardant efficiency; retardant magnesium hydroxide and other agents have a good composite capability, magnesium hydroxide inorganic flame retardants on the market will become the main force. But now it seems, lower prices, occupying the market has not yet reached the goal, one of the reasons is that the level of preparation of the development lag, such as magnesium hydroxide content on the mechanical properties of polymeric materials is strongly dependent on the hydrogen magnesium oxide morphology. Metal stearate
And now controls the morphology of prepared magnesium hydroxide crystals suitable technology is not yet mature. Since the use of different materials, production methods are more economical its main production methods are: bitter brine - lime neutralization, brine ammonia synthesis, France magnesite, dolomite multistage carbonation - Hydrolysis France. These methods are suitable for flame retardants can be prepared using fibrous magnesium hydroxide, convenient source of materials used, low price, the production process is relatively simple, performance is good, it can be recycled by-product, the production process is essentially non-polluting .