High-CTI and high-strength flame-retardant polyamide material and preparation method thereof

Abstract

The invention discloses a high-CTI and high-strength flame-retardant polyamide material and a preparation method thereof. The high-CTI and high-strength flame-retardant polyamide material is prepared from the following components in parts by weight: 60-88 parts of in-situ polymerized polyamide, 10-38 an enhanced component and 2-8 montmorillonite; the in-situ polymerized polyamide is a phosphorus-containing flame-retardant copolymer and is obtained through copolymerization of a reactive flame retardant and polyamide; and the content of phosphorus in the in-situ polymerized polyamide is 3500-8000ppm. The adopted polyamide is the in-situ polymerized polyamide, so that the polyamide material has a good flame-retardant characteristic, and a product can reach the V-0 flame-retardant effect of a UL94 test under the condition of adding a little of flame retardant and montmorillonite or not adding the flame retardant or the montmorillonite. The enhanced component has better compatibility with the polyamide through chemical surface modification, so that the high-CTI value and high-mechanical strength flame-retardant polyamide material is prepared. The high-CTI and high-strength flame-retardant polyamide material is extruded and pelletized by adopting an existing twin-screw extruder, and is simple in method, low in cost and suitable for massive production.

Description

technical field [0001] The invention relates to a high-CTI, high-strength flame-retardant polyamide material and a preparation method thereof, belonging to the field of flame-retardant polyamide materials and their preparation. Background technique [0002] Thermoplastic polymer materials are widely used in electronics, electrical appliances, and high-voltage components due to their light weight, insulation, and easy processing. However, most electronic, electrical, and high-voltage components require the materials used to have resistance Combustibility, arc resistance and other properties; especially for high-voltage transformers, most of the insulating materials used are epoxy resins, which have many problems such as heavy weight, easy foaming during molding, severe arcing, and non-recyclability. With the advancement of technology, the products used are becoming more and more environmentally friendly, miniaturized, and integrated, which puts forward higher requirements for...

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Problems solved by technology

[0004] Although the halogen flame retardant has the advantages of less addition and good flame retardancy, its addition not only reduces its strength, but also greatly reduces the electrical insulation (CTI) value; although phosphorus and nitrogen flame retardants have an Insulation (CTI) has little effect, but the addition amount is larger than that of halogen flame retardants, which has a greater impact on the mechanical properties of materials

[0005] Chinese patent applications 201410604059, 201210081860.3, and 200610053337.4 all disclose methods for preparing high CTI flame-retardant polyamides, but they all have a large amount of flame retardants by blending, which always has a certain impact on the CTI value, which is difficult A flame-retardant polyamide material with higher CTI and high strength is prepared, and due to the large amount of flame retardant added, the mechanical properties of the material are also greatly affected, which brings great difficulties to the preparation of ultra-thin and other electronic products

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