Views:9 Author:Vera Publish Time: 2018-07-20 Origin:Site
ABS is a kind of thermoplastic engineering plastics, which has good adaptability to temperature and is widely used in automotive, electrical, electronic and building materials, but the flame retardant effect of ABS is poor. The LOI is only about 19.0%, and its thermal stability is poor, and it is easy to burn, which makes it difficult to carry out rescue. ABS/PC alloy has better heat resistance, impact resistance and processing property, which greatly expands the application of ABS resin. But the LOI is only about 24.0%, and the flame retardant property is also poor. At present, flame retardant modification of ABS and ABS/PC alloys has become a hot research and development area. The results show that the flame retardant properties of ABS and ABS/PC alloys are improved, the application range of ABS/PC alloys is expanded to meet the fire resistance standard, and the ABS/PC alloys are used in the field of automobile, electrical appliances and electronics instead of steel, and the market prospect is great.
Organic Flame retardant ABS
Organic flame retardant (e.g. PSPTR, MA, MCA, SOL-DP, HDP, IFR, PDTA, DCP, PEPB, etc. ) has good flame retardancy. It is helpful for ABS to form homogeneous carbon layer during combustion and reduce thermal decomposition rate, thus improving its flame retardant effect.
Inorganic Flame retardant ABS
Inorganic flame retardant such as graphene, red phosphorus and ILT can improve the thermal stability and carbon residue of ABS during combustion, thus improving the flame retardancy of ABS.
Flame retardancy of ABS / PC alloy
The ABS/PC alloy combines the excellent properties of ABS and PC resins -- good processability of ABS, high impact strength and temperature resistance of PC, UV resistance, etc., and can be widely used in household appliances, commercial electrical appliances, automobile parts, etc. Therefore, the flame retardancy of ABS / PC alloy has higher requirements.
Inorganic flame retardant ABS/PC alloy
Inorganic flame retardants have good thermal stability and can improve the initial decomposition temperature of composite materials.
ABS / PC alloy used in DM, AHP and other inorganic flame retardants can effectively improve the flame retardancy of the alloy.
To sum up, the addition of inorganic flame retardants such as red phosphorus, graphene, montmorillonite, hydrotalcite and APP, PF improved the thermal stability of ABS and ABS/PC alloys, and effectively improved their flame retardancy. At present, the flame retardant effect of flame retardants such as ZB, DCP and IFR is better, so that the flame retardant grade of ABS and ABS / PC alloy has reached the UL-94 V-0 grade and the LOI is over 30%. The flame retardant effect of PSPTR and PF is not very good. The flame retardant grade of ABS and ABS/PC alloy is UL-94 V-1, and the flame retardant grade of ABS and ABS / PC alloy is UL-94 V-1. The LOI is only about 20%. Therefore, how to improve the flame retardancy of ABS and ABS / PC alloys will still be a hot topic in the future. We can start with the following two aspects: 1) develop a new flame retardant with higher flame retardant efficiency; 2) two or more flame retardants were mixed to play the synergistic effect of flame retardants. In short, with the higher and higher demand for the flame retardant properties of polymer materials, green environmental protection has gradually become the development direction of flame retardants.