Flame retardant polypropylene resin blend and preparation method thereof

Abstract

The invention discloses a flame retarding polypropylene resin blend and a preparation method thereof. The flame retarding polypropylene resin blend is prepared according to a weight ratio by 56-90 percent of polypropylene resin, 3-18 percent of flame retardant, 3-6 percent of auxiliary flame retardant, 1-6 percent of flame retarding synergist, 2-8 percent of compatibilizer, 0.5-5 percent of melt strength regulator, 0.1-0.5 percent of antioxidant, 0.1-0.5 percent of heat stabilizer, and 0.3-0.5 percent of light stabilizer. The components are mixed in a high-speed mixer for 2-5 minutes, then extruded by a twin-screw extruder and finally granulated. The flame retarding polypropylene resin blend of the invention can maintain a flame retarding property, and at the same time, has the advantages of low proportion, excellent mechanical property, long thermo oxidative aging, excellent lightfast aging capability, and reduced flame retardant migrating, etc.

Description

technical field [0001] The invention relates to a flame-retardant polypropylene resin blend and a preparation method thereof. Background technique [0002] Polypropylene is widely used in automobiles, home appliances, construction and other industries due to its excellent mechanical properties, chemical resistance and light specific gravity. However, polypropylene has a low oxygen index, is easy to burn, and the flame is easy to spread, which limits its wider application. In recent years, with the strengthening of people's safety awareness and the continuous improvement of safety regulations in electrical appliances, construction and other industries, higher requirements have been put forward for the flame retardancy of polypropylene and other plastic products. The United States, Canada, France and other countries have clearly stipulated the flame retardant materials used in electrical appliances and buildings, and promulgated relevant laws and regulations, requiring electr...

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Problems solved by technology

But its specific gravity is higher than 1.1g / cm 3 At the same time, the thermal oxygen resistance and light aging resistance of the composition are low, which limits the wide application of this type of material

[0005] Chinese patent application CN1479803A discloses a polypropylene resin composition. The resin achieves light-resistant and aging-resistant flame-retardant polypropylene by adding a low-melting flame retardant, antimony oxide, and light-aging agent. The density of the composition is between 1.0- 1.1g / cm 3 However, the addition of flame retardant reduces the effect of heat and oxygen aging resistance of the composition, and at the same time, the melt dripping is relatively large and the flame retardant is easy to migrate

[0006] U.S. patent application US7067576B2 discloses a polypropylene resin composition, which achieves better light aging resistance and rain-drenched flame retardancy through low-melting flame retardants, antimony oxide, anti-aging agents, titanium dioxide and coupling agents Polypropylene, but it does not have long-term heat and oxygen aging resistance, and the melt dripping is unstable

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