High-strength carbon fiber reinforced halogen-free flame-retardant PA66 (Polyamide 66) composite material and preparation method

Abstract

The invention relates to a high-strength carbon fiber reinforced halogen-free flame-retardant PA66 (Polyamide 66) composite material and a preparation method of the high-strength carbon fiber reinforced halogen-free flame-retardant PA66 composite material. The composite material comprises the following components: 20 to 60 parts of PA66, 15 to 50 parts of PA6, 10 to 25 parts of halogen-free flame retardant, 10 to 30 parts of carbon fiber, 2 to 12 parts of grafting type toughened modifier, 0.2 to 1 part of antioxidant, and 0.2 to 1 part of lubricating dispersant. The preparation method comprises the following steps in sequence: mixing all the raw materials mentioned above for 3 to 5 minutes by a high-speed mixer, except the carbon fiber; discharging to obtain the mixture; controlling the processing temperature of a twin-screw extruder to 230 to 250 DEG C, and controlling the revolutions of the screws to 180 to 600 rotation per minute; transferring the mixture into the twin-screw extruder; feeding the carbon fibers from the side; and extruding and pelleting, so as to obtain the high-strength carbon fiber reinforced halogen-free flame-retardant composite material. The high-strength carbon fiber reinforced halogen-free flame-retardant PA66 composite material is developed based on the special requirements on static resistance and flame retardant of the materials under the requirements of the electric appliances to the electromagnetic screening. Compared with the prior art, the high-strength carbon fiber reinforced halogen-free flame-retardant PA66 composite material has the advantages that the surface resistance is up to 10<3> to 10<6> ohms, the electromagnetic shielding performance and halogen-free environmental protection meet UL-94V0 standard, the mechanical strength is high, the appearance is nice, the comprehensive performance is outstanding, and the gap in the field of like products in China is filled.

Description

technical field [0001] The invention relates to the preparation of a halogen-free flame-retardant reinforced nylon composite material, in particular to a high-strength carbon fiber reinforced halogen-free flame-retardant PA66 composite material and a preparation method thereof. Background technique [0002] Polyamide has good mechanical strength and rigidity, good wear resistance and other advantages, and is widely used in automotive parts, mechanical parts, electronic and electrical fields, etc., becoming the first of the five engineering plastics, replacing traditional metal materials in many applications . In terms of antistatic modification of nylon materials, adding a low molecular weight antistatic agent is the most common antistatic measure. This modified material mainly uses the moisture adsorbed by the antistatic agent on the surface of the material to reduce the surface resistivity, so the durability is poor, and it is not durable. Washing is highly dependent on t...

AI Technical Summary

Problems solved by technology

In terms of antistatic modification of nylon materials, adding a low molecular weight antistatic agent is the most common antistatic measure. This modified material mainly uses the moisture adsorbed by the antistatic agent on the surface of the material to reduce the surface resistivity, so the durability is poor, and it is not durable. Washing is highly dependent on the humidity of the environment. Some foreign scholars compound a certain amount of metal salt sol in the polymer containing ether bonds, and the metal ions cooperate with the ether bonds of the polyether block to form an ion-conducting network inside. Improve the electrical conductivity and enhance the electrical conductivity of the polymer. These two methods have different degrees of decline in the heat-resistant temperature and surface properties of the material, and are not suitable for reinforcing reinforced materials.

However, polymers modified by carbon black and metal fillers can obtain relatively good permanent antistatic properties, but they are often added in large amounts, resulting in large performance damage and difficult processing.

Images