Comparison of two ways of surface modification of aluminum hydroxide
Aluminum hydroxide powder has multiple functions such as flame retardant, smoke suppression, and filling. It can produce synergistic flame retardant effect with various substances such as phosphorus. It is a widely used chemical product and has become an important environmentally friendly flame retardant in electronics, chemicals, cables, plastics, and rubber. Aluminum hydroxide is a filled inorganic flame retardant. In order to achieve a better flame retardant effect, the filling amount needs to be 40%, even as high as 60%, but the high filling amount not only seriously affects the mechanical properties of the product, but also makes the extrusion and processing performance worse. Therefore, in order to make the aluminum hydroxide powder more widely used in flame retardant materials such as polyolefin, it is necessary to carry out surface modification. Objective
Aluminum hydroxide powder has multiple functions such as flame retardant, smoke suppression, and filling. It can produce synergistic flame retardant effect with various substances such as phosphorus. It is a widely used chemical product and has become an important environmentally friendly flame retardant in electronics, chemicals, cables, plastics, and rubber.
Aluminum hydroxide is a filled inorganic flame retardant. In order to achieve a better flame retardant effect, the filling amount needs to be 40%, even as high as 60%, but the high filling amount not only seriously affects the mechanical properties of the product, but also makes the extrusion and processing performance worse. Therefore, in order to make the aluminum hydroxide powder more widely used in flame retardant materials such as polyolefin, it is necessary to carry out surface modification.
At present, the surface modification methods of ultrafine aluminum hydroxide powder are mainly dry modification and wet modification.
(1) Dry modification
After preheating the ultrafine aluminum hydroxide powder to a certain temperature, the modifier is slowly added to the high-speed stirring aluminum hydroxide powder, and the time is recorded, and the reaction is stopped for a certain time.
The advantages of dry modification are low equipment requirements and simple operation. The disadvantage is that the labor intensity of workers is high, the pollution is serious, the production efficiency is low, the coating rate of aluminum hydroxide powder is low, only 10%, and the modification effect is poor and unstable.
(2) Wet modification
Wet modification is in the production process of aluminum hydroxide powder, the synthetic aluminum hydroxide slurry is filtered and washed, the filter cake is beaten, the modifier is added to the slurry after beating at a certain temperature, stirred for a period of time, filtered, dried and packed.
The advantages of wet modification are low labor intensity, no dust pollution, high production efficiency, high coating rate of aluminum hydroxide powder, 20-30%, high and stable modification effect. Compared with dry modification, the wet modification process is long and requires higher equipment. Due to the many advantages of wet modification, it is gradually replacing the dry modification production method.
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Everyone knows that there are two common flame retardants. Today we are going to talk about only one of them. Aluminum hydroxide flame retardant is an environmentally friendly halogen-free flame retardant, which can be widely used in fabrics, wood, plastics, and rubber., Polyurethane and other industries have ideal flame retardant effect. In the process of industrial application, it is found that flame retardant failure occurs when aluminum hydroxide flame retardant is added. The following are the reasons for the failure of aluminum hydroxide flame retardant, how to prevent it, how to deal with the operation, and restore the original function.
As a flame retardant, magnesium hydroxide also need to improve what aspects?
When it comes to flame retardants, everyone is familiar with them. Although we usually have less contact with them, we can know what they are used for from the name. Have to talk about magnesium hydroxide, we all know that its main presentation state is a granular, at present, the market sales of magnesium hydroxide particle size is larger, part of the commodity particle size up to tens of microns, immediately used as a flame retardant, poor dispersion, the physical properties of raw materials greater harm. In industrial production, physical grinding methods are generally used to reduce the particle size to 1 micron. The surface of magnesium hydroxide has high polarity and is easy to agglomerate. As the compatibility of refractory materials and polymer substrates, it not only reduces its flame retardant grade, but also causes more serious harm to the physical properties of raw materials.
Hefei Zhongke Flame Retardant New Material Co., Ltd
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