A nano-modified environmentally friendly halogen-free flame-retardant polypropylene and its preparation method

Abstract

The invention discloses environment-friendly nano modified halogen-free flame retardant polypropylene and a preparation method thereof. The environment-friendly nano modified halogen-free flame retardant polypropylene comprises the following raw materials in parts by weight: 66 parts of polypropylene matrix, 20 parts of halogen-free expanded flame retardant, 2 parts of conductive packing, 1-3 parts of nano modified particles, 1-3 parts of additive, 5 parts of compatilizer, 1 part of an antioxidant and 2 parts of a lubricating agent. The preparation method comprises the following steps: evenly mixing the polypropylene matrix, the compatilizer, the antioxidant and the lubricating agent by virtue of a high-speed mixer, and then putting the mixed material into a precision open mill; after the mixed material is melted, adding the halogen-free expanded flame retardant and the conductive packing, melting and mixing; and then adding the nano modified particles and the additive; and mixing in the precision open mill, thus obtaining polypropylene. According to the environment-friendly nano modified halogen-free flame retardant polypropylene, the nano modified particles and hollow glass beads are adopted as flame retardant synergists, so that the flame retardant property of the polypropylene can be improved, the viscosity of polypropylene polymer melt can also be significantly reduced, the processability is improved, the heat stability is improved, and the environment-friendly nano modified halogen-free flame retardant polypropylene is excellent in yellowing resistance, good in impact resistance and good in bending strength.

Description

Technical field [0001] The invention relates to the field of polypropylene, in particular to a nano-modified environment-friendly halogen-free flame-retardant polypropylene and a preparation method thereof. Background technique [0002] According to "Polymer Combustion and Flame Retardant Technology" (edited by Zhang Jun, Ji Kuijiang, Xia Yanzhi, etc., Chemical Press, April 2005), polypropylene itself is a flammable material with an oxygen index of only 17.0~18.0%, and The char formation rate is low, and it is easy to produce droplets during combustion, so it is required to be flame-retardant modification in many applications. At present, flame retardants are mainly used to add flame retardants to polypropylene at home and abroad. Halogen-containing flame retardants emit a large amount of smoke and the hydrogen halide gas released is corrosive, and many countries have banned their use. [0003] According to "Advanced Polymer Processing Technology" (Polymers for Advanced Technolog...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of low mechanical properties of flame-retardant polypropylene in the prior art, and provide a nano-modified environmentally friendly halogen-free flame-retardant polypropylene and its preparation method. By adding nano-modified particles and additives, the polypropylene Improved impact resistance and flexural strength, improving its mechanical properties

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