Improved flame retardant effect, impact resistance and thermal properties

2021-12-13 16:00:10

The commonly used modification methods are: (1) physical-chemical adsorption modification with stearic acid; (2) Its surface was modified by titanate, aluminate and other coupling agents; (3) Alkyl phenolic resin and nitrile rubber were used to modify its surface in situ.

Nano aluminum hydroxide can not only increase the flame retardant performance, but also improve the surface finish, mechanical and electrical properties of polymer products, enhance their anti leakage, arc resistance and wear resistance, eliminate smoke and reduce the generation of corrosive gas during material combustion. In addition, the effect of combined use with other flame retardants is more ideal and has broad application prospects.

Emulsification and solubilization are continuous, but essentially different. Solubilization can significantly reduce the chemical potential of the solubilized matter and make the system more stable and thermodynamically stable. As long as the external conditions remain unchanged, the system does not change with time; Emulsification is thermodynamically unstable.

When aluminum hydroxide is used alone as a flame retardant, the flame retardant efficiency of general metal oxides is low. Generally, the filling amount must be more than 40% to meet the actual flame retardant requirements, and the moderate flame retardant can be obtained only with high addition amount. Aluminum hydroxide itself has strong polarity, hydrophilic and oil repellent. Especially with the ultra-fine particles, its powder is easy to agglomerate and has poor adhesion with the substrate, resulting in the decline of processing and mechanical properties of the material. Therefore, when the amount of aluminum hydroxide is high, the mechanical properties of polymer materials will decline and the processability will become worse. The improved method is to select a surface modifier with excellent performance to modify the surface of aluminum hydroxide and improve its water loss temperature, so as to withstand the processing temperature of general plastics and further broaden the application range of aluminum hydroxide. Another method is to improve the surface activity of particles, improve the dispersion, improve the compatibility between particles and polymer materials, and improve the effect of flame retardant, impact resistance and thermal properties.