Method of nano halogen-free flame retardant polyamide-6

Abstract

The invention relates to a preparation method of nano halogen-free flame retardant polyamide-6. The preparation method comprises the steps: firstly weighing polyamide-6, nano MCA halogen-free flame retardant agent and an antioxidant, and mixing uniformly the raw materials; and then preheating a double-screw extruder to the temperature of 185-280 DEG C, adding the uniformly-mixed raw materials into the double-screw extruder, and then carrying out granulation on the product, to obtain the nano halogen-free flame retardant polyamide-6. The prepared nano halogen-free flame retardant PA 6 has the advantages of good flame retardant effect, less adding amount of the flame retardant agent, small combustion smoke formation quantity, and no production of toxic and corrosive gases, and has mechanical properties higher than those of a common halogen-free flame retardant PA6 in markets.

Description

Technical field [0001] The invention belongs to the technical field of materials, and specifically relates to a preparation method of nanometer, halogen-free flame-retardant polyamide-6 (nylon 6). Background technique [0002] Polyamide-6 (PA6) is an important engineering plastic, which has been widely used in the fields of electronic appliances, automobiles and machinery. However, the phenomenon of melting and melting of polyamide-6 during the combustion process is more obvious. Low strength, easy to produce a large number of flaming drops. In the event of a fire, it emits a lot of heat and can easily cause secondary combustion. Therefore, in the use of production and life, PA6 needs to be flame-retardant treatment. [0003] Currently commonly used polyamide-6 flame retardants mainly include metal hydroxides, phosphorus-nitrogen flame retardants and nitrogen flame retardants. Metal hydroxide is an environmentally friendly flame retardant, which is widely used due to its abundan...

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Problems solved by technology

[0004] The above three flame retardant methods can all achieve the purpose of halogen-free flame retardant polyamide-6. At the micron level, the particle size is too large, and the compatibility with polymer materials is not good enough. The use of its flame-retardant polyamide-6 will cause a decrease in mechanical properties; while the flame-retardant efficiency of magnesium hydroxide is not high, the addition amount needs to be very large. It will greatly affect its mechanical properties, which greatly limits the use space of polyamide-6

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