Flame-retardant polypropylene composition with high glow-wire ignition temperature

Abstract

The invention discloses a flame-retardant polypropylene composition with high glow-wire ignition temperature (GWIT). The composition is characterized by comprising the following components in percentage by weight: 35.0 to 66.5 percent of polypropylene, 15.0 to 20.0 percent of brominated flame retardants, 3.0 to 8.0 percent of flame-retardant synergist, 15.0 to 35.0 percent of high-efficiency composite flame retardant, 0.1 to 0.5 percent of primary antioxidant, 0.1 to 0.5 percent of auxiliary antioxidant and 0.3 to 1.0 percent of processing aid. The composition has the advantages that: a) the composite flame retardant can achieve a microcapsule coating effect around the composite flame retardant, and the heat is taken away and the heat conduction is reduced by isolating oxygen; b) ultrafine magnesium hydroxide can generate metal oxide to reduce heat conduction in the heating process of a glow wire, and produce steam which can take away the heat, and the surface treatment of the precipitated ultrafine magnesium hydroxide slightly affects the mechanical properties of the flame-retardant modified polypropylene composition; and c) an organosiloxane polymer with high polymerization degree can form a silicon carbide gel isolation layer to isolate oxygen and achieve a flame-retardant effect, the GWIT is higher than required 750 DEG C, and the composition is widely applied to the fields of machinery, industry and the like.

Description

technical field [0001] The invention discloses a polypropylene composition, in particular a flame-retardant polypropylene composition with high glow wire ignition temperature. Background technique [0002] Flame-retardant polypropylene has high heat resistance, good foldability and good flame retardancy, and is widely used in the fields of electronic appliances and machinery industry. However, some components in these products, especially electronic products, may cause local overheating due to reasons such as poor contact, overload or short circuit, and may cause combustion, endangering the safe operation of the entire system. In order to prevent problems before they happen, the best way to test the fire hazard experiments of electronic and electrical products is to completely repeat the conditions that occur in reality, but in most cases it is impossible. Therefore, in order to simulate the actual conditions as much as possible, the hot Silk test is a better test method. ...

AI Technical Summary

Problems solved by technology

[0010] The shortcomings of the above existing technologies are that the ignition temperature of the high glow wire is low, and its durability is poor or the added auxiliary materials are not suitable for polypropylene materials.