Compound phosphorus-nitrogen series flame-retardant polyamide and preparation method thereof

Abstract

The invention discloses compound phosphorus-nitrogen series flame-retardant polyamide and a preparation method thereof. According to key points of the technical scheme, the compound phosphorus-nitrogen series flame-retardant polyamide is composed of the following components in parts by weight: 60.2-80.1 parts of PA resin, 0.1-0.3 part of liquid oil, 5-15 parts of melamine cyanurate, 5-15 parts of a phosphorus-nitrogen series flame retardant A, 1-3 parts of a phosphorus-nitrogen series flame retardant B, 2-4 parts of a phosphorus-nitrogen series flame retardant C, 0.3-1 part of metal chloride, 0.2-0.5 part of an antioxidant and 0.5-1 part of a lubricating agent. According to the compound phosphorus-nitrogen series flame-retardant polyamide disclosed by the invention, the ignition temperature of glowing filaments of the MCA system is improved, so that the temperature is higher than 750 DEG C, and the flame-retardant effect is greatly improved.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of polymer materials, in particular to a compound phosphorus nitrogen flame-retardant polyamide and a preparation method thereof. [0003] 【Background technique】 [0004] Polyamide, commonly known as nylon (PA), is a general term for thermoplastic resins containing repeated amide groups (-NHCO-) ​​on the molecular main chain, because of its good mechanical properties, electrical properties, heat resistance, toughness, oil resistance, and wear resistance , Self-lubrication, chemical resistance and other excellent properties, widely used in various fields such as electronics, instruments, automobiles, etc. However, unmodified nylon has poor flame retardancy. Its vertical combustion can only reach UL94V-2 level, its oxygen index is about 24, and it will drip during combustion. It is easy to cause fire, so flame retardant nylon is generally modified by flame retardant. [0005] So far, the vast majorit...

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Problems solved by technology

[0006] The flame retardant mechanism of MCA is gas phase flame retardant, and CO is generated during the decomposition process 2 , Ammonia (NH 3 ) and other non-combustible gases, by diluting the concentration of flammable gas to block the air and play a flame-retardant effect, but the amount of carbon in the condensed phase is low during the combustion process, the carbon layer is loose, and a dense protective layer cannot be formed, resulting in poor flame-retardant effect , the burning time is long, and it is easy to drip and ignite. At present, this series of products on the market can only reach UL94V2, and at the same time, its GWFI test cannot pass 750°C

These two fatal flaws also lower the grade of the product, which determines that it can only be used in occasions where the requirements for flame retardancy are not high.

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