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Due to the environmental pollution and resource recovery and reuse problems, the carbon fiber thermosetting resin matrix composite which has been widely used has been impacted to some extent. The carbon fiber reinforced thermoplastic composites with good toughness, moisture resistance, corrosion resistance, high damage tolerance, easy to form, especially for secondary processing and recycling have been favored by the industry.
According to the different matrix of thermoplastic resin, carbon fiber reinforced thermoplastic composites can be divided into three categories: carbon fiber reinforced special engineering plastics, carbon fiber reinforced engineering plastics and carbon fiber reinforced general plastics. Compared with engineering plastics and general plastics, special engineering plastics have superior mechanical strength and better performance in heat resistance and corrosion resistance, which can be applied in aviation military industry, automobile manufacturing, high-end industry and other fields.
Europe, the United States, Japan and other developed countries are obviously in the leading position in this field. More special engineering plastics are researched and developed, such as PEEK, PPS, PI, PEKK, PSF, PES, PPSU, etc. In contrast, at present, China is still dominated by reinforced engineering plastics or general plastics, such as PP, etc. the development of reinforced composites based on special engineering plastics is relatively lagging behind, and the application of continuous carbon fiber reinforced special engineering plastics is even less, most of which are still in the research and development stage.
Taking carbon fiber reinforced thermoplastic prepreg as an example, the strength of carbon fiber reinforced engineering plastics udtp is at least half of that of ultra-high strength steel (tensile strength ≥ 1620mpa). Carbon fiber endows thermoplastic resin matrix with extremely high tensile strength and elastic modulus. The preparation of this prepreg is the basis of mass production of continuous carbon fiber reinforced thermoplastic composite products.
However, the preparation of carbon fiber reinforced thermoplastic composite prepreg involves mechanical design, manufacturing, polymer material processing, modification and composite material preparation and other technical knowledge. The crossing and integration of many fields has become the main bottleneck limiting the application and development of carbon fiber reinforced thermoplastic high-end composite.
In addition, the high-end special engineering plastics itself is a constraint factor. At the beginning of 2018, when the world's largest international exhibition of composite materials was held, the international PEKK manufacturers with a certain commercial scale were also limited to a number of brands such as French akoma company and Indian Rallis company, and only one enterprise was listed in China.
Globally, the R & D and application of carbon fiber reinforced thermoplastic composites have started, but the gap between a few developed countries and most developing countries is still large. At present, the preparation and laying technology of carbon fiber reinforced thermoplastic composites are mainly in the hands of developed countries such as the United States, Germany, Netherlands and Japan, especially monopolized by international chemical material giants such as Japanese Imperial, American hatch and DuPont, German Evonik, Netherlands DSM, France akoma and Belgium Solvay.
In addition, the developed countries have gradually realized mass production in terms of relevant prepreg and product manufacturing technology, while only a few domestic enterprises have set foot in it. The focus of large-scale leading enterprises is still on the production of carbon fiber raw silk. As for the downstream application, it has not been refined and deepened.
It is expected that in the next year, the machinery manufacturers of composite materials will establish a production line for continuous carbon fiber reinforced thermoplastic composite prepreg and products, which will have a positive impact on narrowing the technical gap of continuous carbon fiber reinforced high-end thermoplastic composite products.
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