UL94-5VA-grade high-GWIT (Glow Wire Ignition Temperature) reinforcing PA66 material and preparation method thereof

Abstract

The invention discloses a UL94-5VA-grade high-GWIT (Glow Wire Ignition Temperature) reinforcing PA66 material and a preparation method thereof. The UL94-5VA-grade high-GWIT reinforcing PA66 material is prepared from the following raw materials: PA66 resin, PPO resin, a bromine flame retardant, sodium antimonite, a compound flame retardant, a glass fiber, a toughening agent, an antioxidant and a lubricant. The preparation method comprises the following steps: (1) fully drying PA66 resin; (2) fully mixing fully dried PA66 resin and other raw materials except for the glass fiber to obtain a mixture; and (3) adding the mixture into an extruder, extruding and granulating, simultaneously adding glass fiber at the fifth zone of the extruder, cooling with water and granulating. The composite material has excellent flame-retardant property, the GWIT of the material is increased by 50-110 DEG C, the GWIT at 1.5mm can be 875 DEG C and the flame-retardant property can be subjected to UL94-5VA test at 1.5mm.

Description

technical field [0001] The invention relates to a UL94-5VA grade high GWIT reinforced PA66 material and a preparation method thereof. Background technique [0002] Glass fiber reinforced PA66 material has very good mechanical strength, high heat resistance, excellent wear resistance, self-lubrication, good processability, and is widely used. In recent years, electronic, electrical, communication, and electromechanical equipment have been developing towards high-performance miniaturization, and the requirements for the flame retardancy of nylon materials are getting higher and higher. Most of the conventional flame-retardant reinforced PA66 materials can meet the requirements of UL94-V0, but it is difficult to further improve the flame-retardant grade to the UL94-5V level, especially the UL94-5VA level of thin-walled parts, which requires test samples and flames. Contact surfaces must be free from perforation after repeated flame applications. [0003] The current society p...

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Problems solved by technology

[0004] In the prior art, PA66 materials are also modified to obtain high glow-wire ignition temperature. For example, the Chinese patent No. 200910197586.4 discloses a high-glow-wire environment-friendly flame-retardant reinforced PA66 composite material and its preparation method. The PA66 Although the composite material has a high glow wire ignition temperature, the flame retardancy of the product is only UL94V0, which affects its application range

The Chinese patent No. 200210541756.8 discloses a high-glow wire flame-retardant reinforced PPO / PA alloy and its preparation method. Although the method increases the temperature of the glow wire by making an alloy, more PPO is added and PA The compatibility is not good, and the color is yellow and the fluidity is poor, which cannot meet the production of thin-walled parts, and the flame retardancy of the product is only UL94V0.

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