MCA flame retardant nylon 66 composite material and preparation method thereof

Abstract

The invention discloses an MCA flame retardant nylon 66 composite material and a preparation method thereof. Specifically, nylon 66 is adopted as the resin matrix, an MCA flame retardant common on themarket is employed, and at least one of a C8-C18 long carbon chain monobasic saturated carboxylic acid compound and a C8-C18 long carbon chain dibasic saturated carboxylic acid compound is combined as the flame retardant stabilizer to make the composite material reach a stable V0 flame retardant grade. The composite material is prepared from 68-94 weight parts of PA66 resin, 6-30 weight parts ofthe MCA flame retardant, 0.2-0.4 weight part of an antioxidant, 0.2-0.6 weight part of a lubricant, and flame retardant stabilizer 0.2-1 weight part of the flame retardant stabilizer by means of meltextrusion and granulation. By using an ordinary MCA flame retardant, a V0 grade flame retardant PA66 material can be obtained, and the content of the MCA flame retardant can be as low as 6wt%. The composite material has a simple preparation process and is low in cost, and can be applied to the fields of electronics and connectors, especially the wiring terminal field.

Description

technical field [0001] The invention belongs to the technical field of polyhexamethylene adipamide (PA66) modification, and particularly relates to an MCA flame-retardant nylon 66 composite material and a preparation method thereof, which can be used in the fields of electronic appliances and connectors, especially the field of terminal blocks. Background technique [0002] Polyamide resin has excellent comprehensive properties such as excellent mechanical properties, barrier properties, heat resistance, wear resistance, and chemical corrosion resistance, and is widely used in the fields of machinery manufacturing, electric tools, electronic appliances, and transportation. However, because PA66 resin can only reach the V-2 flame retardant grade, and the molten droplets during the combustion process are likely to cause secondary ignition and cause a larger fire, which greatly limits its application fields, especially in industrial / automotive electronic appliances In the field...

AI Technical Summary

Problems solved by technology

However, in the combustion test of the traditional MCA flame-retardant PA66 material, the melt droplets contain high heat. During the dripping process, they either directly ignite the absorbent cotton with flame droplets, or ignite the absorbent cotton with high heat in the form of melt droplets without flame, resulting in The material flame retardant test results cannot reach the V0 level in the UL standard, or cannot reach the stable V0 flame retardant level, and the fluctuation is particularly large

Foreign patent JP2016155924 (A) can achieve a stable V0 flame retardant grade by combining MCA with different particle sizes together with polyol ester surfactants. However, MCA with different particle sizes needs to be obtained through a special synthesis process. applicability is limited

Chinese patent CN 103408750 A adds melamine cyanurate (MCA) as a flame retardant during the polymerization of polyamide monomers, and nano-SiO 2 and metal oxides as synergistic flame retardants, and in-situ polymerization to prepare flame-retardant polyamides. Although this method can prepare composite materials with flame-retardant stability and excellent mechanical properties, it is not suitable for large-scale industrial production

Chinese patent CN101679743A uses polyamide as a matrix and melamine cyanuric acid as a flame retardant. By adding a surfactant, that is, containing at least one polyalkylene polyol fatty acid ester, the MCA flame-retardant polyamide of V0 flame-retardant grade can be obtained. Amide composite materials, but the addition of MCA in this method is very high, which will seriously affect the mechanical properties of composite materials, especially the toughness of materials

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