There is provided a method of selectively depositing a syntactic foam, i) selecting a low density polymer with a density in the range of from 0.8 to 1.2 g/cm3, ii) forming an admixture of a pre-polymer 50-95%vol that will form the said low density polymer, and hollow microspheres in the range of from 5- 50%vol; iii) selectively depositing the admixture via a nozzle to form a layer, causing solidification of the polymer, repeating step iii) to form the device on the substrate wherein the syntactic foam has a density in the range of from 0.3 to 0.9g/cm3. Preferably the deposition process produces cavities with no syntactic foam which decreases the density of the syntactic foam. The polymer may be a thermoset polymer, particularly an epoxy, or a thermoplastic polymer chosen from polyamide, polypropylene, high density polyethylene, low density polyethylene or polyetherimide. The microspheres may be glass, ceramic, polymer or metal spheres. Flotation devices and vehicles using the foams are also claimed.
Syntactic foam
2023-11-29
Patent
Elektronische Ressource
Englisch
IPC: | C08J Verarbeitung , WORKING-UP / B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS |
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