Teijin Develops Highly Heat- and Impact- resistant Prepreg as Carbon Fiber Intermediate Material for Aerospace Applications
Tokyo, Japan --- Teijin Limited announced today its development of Japan's first prepreg, or carbon fiber sheet pre-impregnated with bismaleimide (BMI) matrix resin that offers high resistance to both heat and impact, making it ideally suited to use in aerospace engine components.
Teijin's new BMI resin pre-impregnated prepreg achieves a high glass transition temperature (Tg) of 280℃ and compression after impact (CAI) of 220MPa, a previously difficult combination made possible based on Teijin's original resin-composition formulating technology. The new prepreg also maintains its coefficient of linear thermal expansion and high dimensional stability at both low and high temperatures. Moreover, by adjusting resin viscosity, Teijin also has improved moldability by adjusting the resin flow through preforms in the mold cavity and reduced curing time with its new prepreg compared to conventional BMI-based prepregs.
Teijin, having developed technologies to adapt its prepreg for engine components, is now working on other high-heat applications for aerospace. These efforts will be supported with the knowhow and global marketing channels of Renegade Materials Corporation, a provider of highly heat-resistant composites, which Teijin recently decided to acquire.
Teijin will exhibit the new prepreg in the Teijin booth (hall6, G28 & J28) at JEC World 2019, the world's leading composites exhibition, which will take place from March 12 to 14 in Paris.
Teijin is rapidly expanding its market for next-generation aircrafts by developing midstream-to-downstream lineups and related applications, such as cost-effective carbon fibers with higher-tenacity and higher-tensile modulus and intermediate materials including thermoplastic prepreg. Going forward, Teijin intends to further strengthen its position as a leading solution provider for aircraft applications, targeting annual sales in this field in excess of USD 900 million by around 2030.
Prepregs, which are intermediate materials for carbon fiber reinforced plastics (CFRPs), are used in fields ranging from aircraft and automobiles to infrastructure and leisure. As such, their prescribed properties must differ widely depending on the application. To address specific needs, technologies for various combinations of carbon fiber and matrix resin and for specific processing needs continue to be developed.
Prepregs are generally impregnated with lightweight, high-intensity epoxy resin. Conventional BMI resin-impregnated prepreg is already used for high-temperature applications such as aerospace engine components to prevent degradation and deformation. BMI resin, however, loses shock resistance when heat resistance is increased. Also, CFRP made of BMI resin tends to peel apart and crack when subjected to strong impact. In addition, molding BMI resin can be difficult due to its liquidity.
About the Teijin Group Teijin (TSE: 3401) is a technology-driven global group offering advanced solutions in the areas of environmental value; safety, security and disaster mitigation; and demographic change and increased health consciousness. Its main fields of operation are high-performance fibers such as aramid, carbon fibers & composites, healthcare, films, resin & plastic processing, polyester fibers, products converting and IT. The group has some 170 companies and around 19,000 employees spread out over 20 countries worldwide. It posted consolidated sales of JPY835 billion (USD 7.6 billion) and total assets of JPY 986.2 billion (USD 9 billion) in the fiscal year ending March 31, 2018.