What are the common types of halogen-free flame retardants?
Inorganic flame retardants are all universal flame retardants in theory, but their mechanism is the mechanism of quantitative change causing qualitative change, so their mechanism determines their addition amount and determines their application scope and direction. Let's find out what are the common halogen-free flame retardants?
Inorganic flame retardants are all universal flame retardants in theory, but their mechanism is the mechanism of quantitative change causing qualitative change, so their mechanism determines their addition amount and determines their application scope and direction. Come to understand the common halogen-freeflame retardantWhat's there?
Commonly used halogen-free flame retardants mainly include metal hydroxides (such as magnesium hydroxide, aluminum hydroxide), boron-containing compounds (such as boric acid, borax), intumescent flame retardants, phosphorus flame retardants, and silicon flame retardants.
Metal hydroxide mainly reduces the temperature of the material body by decomposing and absorbing heat, releases water vapor to dilute the concentration of combustible gas, and produces highly heat-resistant metal oxide to cover the surface of the material to play a flame retardant role. Its disadvantages are low flame retardant efficiency and large addition amount. The usual addition amount must reach more than 50% (mass fraction, the same below) to be effective flame retardant, which will seriously affect the processing performance and mechanical properties of flame retardant materials.
It can be improved by reducing the particle size of the flame retardant (nano) and proper surface modification (such as surface chemical grafting, coupling, coating, etc.). The organic intumescent flame retardant system is mainly composed of acid source, carbon source and gas source, and the porous carbon barrier layer with heat insulation and barrier function is formed by dewatering, carbonization and foaming expansion of polymer materials during combustion to play the role of flame retardant.
This kind of flame retardant has the characteristics of halogen-free, low smoke, non-toxic, anti-melt dripping, environmental friendliness, etc. The problems are that the thermal stability is not high enough, the moisture absorption is large, the dispersion in the resin matrix and the interface compatibility are not ideal.
The use of microcapsule technology to properly coat the flame retardant can significantly improve the water resistance and flame retardant properties of the composite material. Expandable graphite is an inorganic intumescent flame retardant. At high temperatures, the intercalation between graphite layers rapidly vaporizes, and the regularly arranged graphite layers are expanded by tens to hundreds of times, covering the surface of polymer materials to extinguish the flame.
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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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