Laminating resins, binders and bonding pastes

Hexion Inc. (formerly Momentive Specialty Chemicals, Columbus, OH, US), introduced several new composite resin systems and showcased composite automotive, aerospace and railcar parts made with Hexion systems.

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Hexion Inc. (formerly Momentive Specialty Chemicals, Columbus, OH, US), introduced several new composite resin systems and showcased composite automotive, aerospace and railcar parts made with Hexion systems. For the automotive industry, Hexion intro- duced an epoxy system specially designed for structural components, with a 60-second injection-and-cure cycle and enhanced demolding properties, compared to prede- cessor systems. EPIKOTE TRAC 06170 epoxy and EPIKURE TRAC 06170 curing agent were formulated for larger automotive structural components, which present different chal- lenges than smaller composite parts. Hexion, therefore, has optimized the system’s chem- istry to maintain the resin injection window necessary for larger parts while reducing the cure cycle duration. The resin infusion system is compatible with a new, fully crosslinkable preform binder from Hexion, EPIKOTE TRAC 06270, which is applied during fiber layup to fix the fibers in the shape of the composite and avoid displacement during infusion.

Also new is EPIKOTE MGS PR685, a epoxy-based, spray-applied binder for securing reinforcements in molds, particu- larly for the manufacture of large wind turbine blades. Hexion says the binder is compatible with RTM and RIM processes and dissolves into the final resin matrix and, thus, participates in matrix crosslinkage. It does not, says the company, adversely affect the mechanical properties of the final composite product.

Also for the wind energy industry is a new bonding paste, EPIKOTE MGS resin BP 535/EPIKURE MGS curing agent BPH 538, designed specifically for the manufacture
of long turbine blades, which require longer processing time. Hexion says this bonding paste will not form a film until after four hours or more of open time, even at 70% relative humidity. Other features include good fatigue performance, good sag resis- tance, minimal bleeding from vertical gaps, long pot life and low exotherm. It also can be used in marine, sporting goods and mold manufacturing applications. 

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