Method of making syntactic foam core material

Details Method of making syntactic foam core material Method of making syntactic foam core material

1996-06-03

1998-12-08

Crispino, Richard

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156221, 156283, 156289, 1563096, 264109, 264DIG6, 264DIG7, B29C 7066, B32B 326, B32B 518

Patent

active

058463577

ABSTRACT:
A syntactic structural foam product in flat sheet form or curved three-dimensional form adaptable to such uses as a light weight structural core for composite laminates, is made of a mixture of hollow ceramic microspheres and dry resin powder, of either thermosetting or a high-temperature thermoplastic resin, distributed in the interstices of the mass of microspheres for integration of the mixture into desired form upon heating and cooling. Resin powder collected as a waste by-product from resin coating materials can be recycled in the production of the desired product. The foam product is produced by first intermixing the microspheres and powdered resin by physical agitation of the mixture and depositing the mixture as a layer over a surface having a release agent thereover within a dimension defining region between boundary members and then supplying heat with or without pressure to the layer at a temperature and for a time period sufficient to effect a melting of the resin powder and thereafter cooling the resin in a hardened condition to integrate the mixture into the product desired after which the product is withdrawn from the forming zone. Reinforcing elements such as glass or carbon fibers can be selectively included in the mixture for predeterminable desired physical and mechanical properties.

REFERENCES:
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patent: 2985411 (1961-05-01), Madden, Jr.
patent: 3429955 (1969-02-01), Johnson et al.
patent: 3947388 (1976-03-01), Ohkawa et al.
patent: 4095008 (1978-06-01), Sundstrom et al.
patent: 4447565 (1984-05-01), Lula et al.
Ocean Materials, Naval Engineers Journal, Apr. 1968, pp. 185 and 193.

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