Environment-friendly fire retardant polypropylene material of non-precipitating fire retardant and method for preparing same

Abstract

The invention discloses an environment-friendly fire retardant polypropylene material of a non-precipitating fire retardant and a method for preparing the same. The polypropylene material is prepared from the following raw materials in percentage by weight: 80 to 91 percent of polypropylene resin, 6 to 11 percent of composite fire retardant, 0.8 to 2 percent of nylon resin, 0.8 to 1 percent of compatilizer, 1 to 5 percent of black masterbatch, 0.2 to 0.5 percent of antioxidant, and 0.2 to 0.5 percent of processing aid. The preparation method comprises the following steps of: mixing the raw materials according to the proportion, stirring the mixture by a high-speed mixer for 0.5 to 1 minute for even mixing, adding the mixture into a co-rotating twin-screw extruder with the length-diameter ratio of 30:1-75:1, controlling the temperature of the twin-screw extruder to between 180 and 210 DEG C, and obtaining the finished product by melt extrusion, tension bracing, cooling and granulation.The polypropylene material is suitable for manufacturing a shell of an electric product; and the shell has good fire retardant property, and the fire retardant is not precipitated from the surface when the shell is used for a long time, so that the appearance of the product is not affected, and the product is environment-friendly.

Description

technical field [0001] The invention belongs to the field of chemical materials, and discloses an environment-friendly flame-retardant polypropylene material without precipitation of flame retardants and a preparation method thereof. Background technique [0002] Polypropylene (PP) has the characteristics of low density, easy processing, and excellent comprehensive performance, so it has been widely used in daily necessities, automobile industry, electronic appliances and other fields, and is currently one of the most important general-purpose plastics. However, polypropylene has a low oxygen index (about 18%) and is extremely flammable, causing fires. It must be flame retardant modified to further broaden the application field of polypropylene. [0003] The flame retardants used in polypropylene mainly include halogen flame retardants and halogen-free flame retardants. Halogen-free flame retardants such as P-N intumescent, metal hydroxide, coated red phosphorus, etc., hav...

AI Technical Summary

Problems solved by technology

DBDPO flame retardant can still be used in China at present, but the EU has canceled its exemption in July 2008, because it is suspected that it will produce tetrabromodibenzodioxin and tetrabromobenzofuran during combustion. and other carcinogens, which will cause harm to personal safety and the environment when they are flame retardant; flame retardants such as OBE and HBCD, due to their low melting point, can be melt blended with PP during PP processing, and the dispersion effect in PP is better. However, for OBE and HBCD flame-retardant PP materials, after a period of time, the flame retardant will precipitate from the surface of the material, especially in dark-colored products, which greatly affects the appearance of the product and also limits the flame-retardant properties. The range of application of the agent

Therefore, none of the above-mentioned flame retardants can fully meet the requirements of electronic and electrical enclosures.