Long glass fiber reinforced nylon composite material halogen-free environment-friendly flame-retardant master batch and preparation method thereof

Abstract

The invention provides a preparation method of a long glass fiber reinforced nylon composite material halogen-free environment-friendly flame-retardant master batch. The preparation method comprises the following steps: respectively adding 400ml of formic acid solution and 40g of low-molecular-weight nylon into a three-neck flask in sequence, and fully stirring; adding 120 g of diethyl aluminum hypophosphite and melamine polyphosphate compound flame retardant powder into the solution, and obtaining microencapsulated modified diethyl aluminum hypophosphite and melamine polyphosphate compound flame retardant powder after drying and smashing; using 55% by mass of low-viscosity nylon 6 as a carrier, adding flame retardant powder, a nano material flame-retardant synergist, an antioxidant and a lubricant, and obtaining the environment-friendly flame-retardant master batch for glass fiber reinforced polypropylene through melt extrusion and granulation of a double-screw extruder. On the basis of compounding of the halogen-free flame retardant, the nano material is introduced, so that the flame retardant efficiency is greatly improved, the use amount of the flame retardant can be reduced, the falling phenomenon is obviously reduced, and the mechanical property is better.

Description

technical field [0001] The invention relates to the field of halogen-free environmentally friendly flame-retardant masterbatches, in particular to a method for preparing long glass fiber reinforced nylon composite material halogen-free environmentally friendly flame-retardant masterbatches. Background technique [0002] It is inconvenient to directly add flame retardants during the preparation of long glass fiber reinforced nylon composites. The processing temperature of long glass fiber reinforced nylon composites is high and the heating time is long, and the flame retardants are easily decomposed by heat. Granules and flame retardant masterbatch are evenly mixed and then injection molded or molded. [0003] However, there are few halogen-free flame retardants currently used for glass fiber reinforced nylon. The flame retardants that can be used for nylon mainly include red phosphorus, diethyl aluminum hypophosphite, melamine polyphosphate, etc., and the halogen-free enviro...

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Problems solved by technology

[0003] However, there are few halogen-free flame retardants currently used for glass fiber reinforced nylon. The flame retardants that can be used for nylon mainly include red phosphorus, diethyl aluminum hypophosphite, melamine polyphosphate, etc., and the halogen-free environmentally friendly flame retardant It is a hydrophilic polar material, and nylon is a hydrophobic non-polar material. The compatibility between the two is poor, and the addition of halogen-free environmentally friendly flame retardants to nylon will have a negative impact on the mechanical properties.

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