Polyimide (PI) is a new type of high temperature thermosetting plastic, due to its wide range of temperature
of -269 ~ 400 ℃ can maintain a high physical and mechanical properties, while the air in the -240 ~ 260 ℃
Long-term use, and has excellent electrical insulation, wear resistance, high temperature radiation properties
and mechanical properties, it is widely used in mechanical, electrical and electronics, instrumentation,
petrochemical, metrology and other fields, and has become a global rockets, aerospace and other One
advanced technology areas indispensable material.
Polyimide from DuPont first industrial production since Japan's east Li Dubang, Ube Industries, Kaneka and
Mitsubishi Chemical and other companies have also followed the development and production of the polyimide
resin and film, the former Soviet Union It has developed more than 20 varieties of grades. In addition, the
Japanese company also built a set of polyimide thermosetting bismaleimide device 400 tons / year, former
Rhone Poulenc can also produce polyamide-imide resin.
From the demand point of view, polyimide major consumer areas are concentrated in the United States,
Japan and Western Europe. According to statistics, in 2000 the demand for polyimide United States,
Japan and Western Europe were 10,000 tons, 3,000 tons and 3,200 tons, mainly for the molded article,
production of enameled wire coatings and films.
In recent years, major foreign companies are expanding production scale polyimide, development of new
varieties and new brands, to seek further ways to reduce costs, and through the development of thermoplastic
polyimide and a method of blending modification, further improve the processability of polyimide. For example,
polyimide and bismaleimide, bismaleimide and the like epoxy modification, can improve the workability and
other properties of the material.
Currently, polyimide films are mainly used in the manufacture of composite HF H grade film conductors and
aviation wires. Wherein, H-class film conductors mainly used for electric locomotives and diesel motors,
the aviation wire is mainly used for aircraft power lines and instrumentation lines. Polyetherimide plastic
products not only in high-tech fields rockets, satellites, etc., have begun to be applied in the automotive,
office equipment, household appliances, mechanical seal parts and other fields have a wide range of
applications. In addition, with the recent development of electronic industry, flexible polyimide complex
also increasing the amount of copper, and composite bismaleimide and epoxy resin in aerospace
also has broad application prospects.
Our research work as early as polyimide 1960s began, to the end of the century, the country has a total
annual production capacity of over 500 tons, is expected to 2005, the annual production capacity could
reach 1,000 tons. However, compared with developed countries, China's current production scale and
polyimide resin film is smaller, higher prices and costs, the quality of the product there is a certain gap.
Therefore, to further improve product quality, increase the development of products and raw materials
to develop technologies to improve competitiveness in the international arena, will become the polyimide
focus of future industrial development.