It is often necessary to modify magnesium hydroxide flame retardant in practical use

2022-11-02 17:24:51

When aluminum hydroxide is blended with rubber, it is difficult to form a good interface between the two, and a large amount of filling will inevitably cause great damage to the physical and mechanical properties of rubber. Li Juan et al. used ATH, chlorinated paraffins and Sb2O3 together. The inorganic flame retardant ATH can meet the higher flame retardant requirements without having to be filled with a very high fraction, and at the same time, it does not affect the physical and mechanical properties of rubber.

Brominated halogen-free flame retardants have been produced and used for more than 30 years. At present, there are more than 70 kinds of brominated halogen-free flame retardants, among which the most important ones are decabromodiphenyl ether (dbdpo), tetrabromobisphenol a (tbbpa) and hexabromocyclododecane (hbcd).

The output of the first two accounts for about 50% of the brominated halogen-free flame retardants. Some traditional brominated halogen-free flame retardants are under the pressure of increasingly strict environmental requirements, forcing users to look for alternatives to brominated halogen-free flame retardants, and promoting the emergence of new flame retardant systems. The shrinking market of traditional brominated halogen-free flame retardants such as polybrominated diphenyl ether has provided market space for environment-friendly brominated halogen-free flame retardants such as brominated epoxy resin and decabromodiphenylethane.

With the development of polymer material industry, there are more and more fibers, resins, chemicals, construction, transportation, rubber and other synthetic materials, electronics and other industries. However, most polymers are easily combustible materials. In many application fields, flame retardants need to be added to polymer materials in order to prevent fire, and flame retardants must also be added to adhesives.

Magnesium hydroxide is an important inorganic flame retardant with good thermal stability, no volatilization, no precipitation, no toxic gas generation, no pollution, significant opium damage and many other advantages. It is a green flame retardant widely used in plastics, rubber, flame retardant, smoke and resin polymer materials.

However, it is a kind of compound with high surface polarity. The agglomeration between particles is serious, and the compatibility with polymers is poor. The assembly of physical and mechanical Yanying polymers has deteriorated the processing performance. In actual use, magnesium hydroxide often needs to be modified.

Common methods of modification include surfactant or coupling agent, surface grafting, intercalation, microencapsulation, superfine method, magnesium hydroxide whisker, etc. The system composed of these modified magnesium hydroxide and magnesium hydroxide flame retardants can be used alone or together with other substances to adsorb aluminum hydroxide when applied to adhesives.