Some cold knowledge about thermoplastic carbon fiber composite

2020-03-18 09:21:56 admin 2

1. What are the types of thermoplastic carbon fiber composites?

Carbon fiber thermoplastic composites are composites with carbon fiber as reinforcement and thermoplastic resin as matrix. From the view of carbon fiber reinforcement, it can be divided into long cut carbon fiber (LCF) reinforced thermoplastic composite, short cut carbon fiber (SCF) reinforced thermoplastic composite and continuous carbon fiber (CCF) reinforced thermoplastic composite.

Long cut carbon fiber and short cut carbon fiber mainly refer to the application length of carbon fiber materials. There is no strict fixed distinction between them. They are generally between several millimeters and several centimeters. The more common specifications are 6mm, 12mm, 20mm, 30mm and 50mm. The shorter the length is, the easier it is to distribute uniformly in the resin matrix, but the mechanical properties of both short carbon fiber and long carbon fiber reinforced thermoplastic composites are far less than that of continuous carbon fiber reinforced thermoplastic composites. Therefore, domestic carbon fiber manufacturer Wuxi Zhishang new material adopts the application form of continuous carbon fiber reinforced thermoplastic composite.

Carbon fiber thermoplastic composites can also be classified according to thermoplastic resins. There are many common thermoplastic resins, such as PE, PP, PVC, etc., but carbon fiber reinforced thermoplastic resin composites are mostly used in aerospace, precision equipment and other work environments with high requirements. Therefore, carbon fiber thermoplastic composites are more likely to use peek, PPS Polyimide (PI), polyetherimide (PAI) and other high-end thermoplastic resins as the matrix, through the "strong joint" way to achieve the optimization of material properties.

2. How does thermoplastic carbon fiber composite realize low cost and environmental protection?

Thermoplastic carbon fiber composite material is suitable for making high-end mechanical parts, which has excellent machinability, vacuum formability, stamping molding and bending processability, and as long as the material reaches a certain temperature again, it can be reshaped, with recyclable and environmental protection characteristics from the material characteristics.

For example, according to the special needs, the Japanese imperial people have been able to design and add a recycling process in the process flow to cut, mold and make recycled thermoplastic carbon fiber composite scraps, which can be used to make small products or inject nuts and studs on carbon fiber samples. This method can greatly reduce the loss of raw materials, improve the use efficiency of thermoplastic carbon fiber composite, reduce the comprehensive cost, and achieve the purpose of environmental protection.

Production process of thermoplastic carbon fiber products

In addition, compared with the thermosetting carbon fiber composite, the thermoplastic carbon fiber composite can shorten the molding cycle time and further reduce the production cost in terms of production efficiency because of its special process characteristics.

3. Is thermoplastic carbon fiber composite only suitable for injection molding?

From the process point of view, compared with the molding, the injection molding has a higher degree of automation, the raw materials do not contact with the outside world, so the product appearance quality is guaranteed, there will be no black spots, impurities, color inequality, and the mechanical properties, dimensional stability and accuracy of the product are relatively higher. At present, Japan's Toray carbon fiber giants mainly adopt injection molding method when applying carbon fiber reinforced thermoplastic composite materials, and this method is suitable for the production of complex shape parts and batch production. However, it should be noted that the thermoplastic carbon fiber composite by injection molding must be short cut or powder carbon fiber reinforced. This process is not suitable for the continuous carbon fiber reinforced thermoplastic composite.