New Development of Composite Flame Retardant

New Development of Composite Flame Retardant

Composite flame retardant flame retardant mechanism compound, is a material composed of reinforcing materials and matrix materials combined with each other, so that the advantages of each component can be fully utilized. Therefore, the material will show excellent characteristics that are not found in a single material.

Yinsu company added the flame retardant SNP into the PC material through blending technology and formulated the PC/SNP compound, and then carried out an in-depth study on the ignition efficiency and thermal stability of the compound through the method of Limiting Oxygen Index (LOI), Vertical Combustion (UL-94), Cone Measuring and Temperature Test, Thermogravimetric Analysis Test, etc. The test results showed that the flame retardancy of SNP in PC/SNP compound is very high, and it can be used as the base material of the PC/SNP compound, so as to give full play to the advantages of each component. The test results show that the LOI value of PC/SNP system exceeds the maximum value of 34.5 percent after the addition of SNP less than 0.1 percent and successfully passes the UL-94V-0 class, and the aerodynamic performance of PC substrate is basically unaffected after the addition of SNP less than 0.25 percent.

The increase in SNP reduces the maximum heat release rate and maximum smoke emission rate of PC by 21.1 percent and 25 percent, respectively, resulting in a dual effect of gas-phase and condensed-phase flame retardancy. The increase of SNP advanced the initial dissolution temperature of PC, which was conducive to the formation of a continuous carbon layer.

We also analyzed the thermal decomposition kinetics of the composites using methods such as Flynn-Wal1-Ozawa and Kissinger, and the experimental results showed that SNP could make the activation energy of the thermal decomposition of PC increase greatly, thus improving the thermal stability of the PC matrix.

A study of the apparent morphology of the char layer after LOI testing was carried out using near-infrared spectroscopy and scanning electron microscopy (SEM) techniques, and the results showed that the addition of the flame retardant SNP resulted in a continuous, fluffy char layer of PC/SNP (0.1%) on the surface layer of the system, which consequently resulted in a highly efficient heat and oxygen barrier and hence a flame retardant effect."

In conclusion, the composite flame retardant is produced by a variety of types of flame retardants mixed together, which combines the characteristics of a variety of flame retardants in one, can play a more excellent flame retardant effect, but at the same time, it also has a lot of shortcomings, for example, the production process is relatively complex, there may be some of the disadvantages of the flame retardant.