Flame-retardant polyamide composite material

Abstract

The invention relates to the field of high-molecular materials, in particular a flame-retardant polyamide composite material. The flame-retardant polyamide composite material provided by the invention is prepared from the following components in parts by weight: 35 to 85 parts of polyamide resin and 10 to 25 parts of flame retardant, wherein the flame retardant is prepared from a red phosphorus flame retardant and a synergistic flame retardant; the synergistic flame retardant is an acetylacetone metal salt or a mixture of the acetylacetone metal salt and magnesium hydrate or / and silicate; the acetylacetone metal salt accounts for more than or equal to 40 percent by weight of the mixture. The flame-retardant polyamide composite material provided by the invention has excellent flame retardance security: the flame retardant rating can reach a 0.8mm UL94V-0 level; the ignition risk is low, the glowing filament combustion index can reach a highest severity level (960 / 0.75), and the glowing filament time is less than or equal to 15s; meanwhile, the initiation temperatures of glowing filaments of three thicknesses (3.0mm, 1.5mm and 0.75mm) can be up to the severity level of 750 DEG C.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a flame-retardant polyamide composite material. Background technique [0002] For many years, the flame retardant safety evaluation of electronic and electrical plastic materials or plastic parts has been based on the vertical burning US UL94 as the standard. It is believed in the field that the flame retardant performance is increased from 3.2mm to 1.6mm, to 0.8mm, to 0.4mm, and the safety can be increased by more than 5 times for each level. However, in recent years, fires caused by internal plastic parts of household appliances have occurred frequently during use. Another flame retardant evaluation method of the International Electrotechnical Commission (IEC) of the European Union - the glow wire flame retardant test standard (IEC 60695) has attracted increasing attention. The glow-wire flame retardant test standard uses the glow-wire flammability index (Glow-wire flammabili...

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Problems solved by technology

Phosphine is a highly toxic gas, which not only directly threatens human life and safety when discharged into the atmosphere, but is also prone to spontaneous combustion, posing a greater threat to the life and health of material forming employees

Chinese patent CN102492295A uses superfine red phosphorus masterbatch and magnesium hydroxide to synergistically flame-retardant effect, the amount of red phosphorus masterbatch is as high as 30%, and the flame-retardant grade of red phosphorus flame-retardant polyamide can only reach 3.2mm UL94V-0 Grade, Chinese patent CN106751778A uses rare earth oxide and microcapsule red phosphorus to synergistically flame-retardant PA6, although the consumption of red phosphorus flame retardant is reduced (only 4-8%), but the flame-retardant grade of the prepared PA6 composite material is also It can only reach the 3.2mm UL94V-0 level. BASF has disclosed a polyamide resistant to glow wire (patent announcement number CN105121552A), which is obtained through the synergistic flame retardancy of dialkyl phosphinate and red phosphorus. The flame retardant grade of amide can be 1.6mm UL94V-0 grade, and the glow wire combustion index can reach 960°C (1.5mm) grade, but the price of dialkylphosphinate is relatively high, which is not conducive to large-scale promotion and use

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