FOAM POLYSTYRENE PELLETS WITH REINFORCING SHELL AND METHOD OF THEIR PRODUCTION Russian patent published in 2015 - IPC C08J9/224 C08J9/236 C08J7/00 C08J7/06 B29B9/16 B32B5/16 C04B16/08 C09D1/04 C09D5/18 

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly, to production of porous forged pieces and ingots with inferior fusion point and fusible metals and alloys used for production of parts in machine building and other industrial branches. Foam polystyrene with reinforcing shell consists of surface film with internal cells filled with isopentane and air and coated with outer functional shell of one, or two or three plies. Every said ply comprises binders of the following composition, in wt %: liquid glass - 50, water - 49, surfactant - 1 and additive of disperse metal powder selected from aluminium, magnesium, zinc, lead powders or refractory material powder selected from alumina, magnesite, silica with particle size not over 100 mcm. Invention describes also the method of production of said pellets. It consists in forming of the coating as laminar shell including one, or two, or three plies by application on said pellets of liquid glass binder with addition of surfactant by pulverisation and disperse metal powder or refractory material powder by sprinkling with agitation at screen vibrating pan. Then, they are dried in air flow heated to 70°C for 10 minutes and cooled for bonding of powder particles to get reinforcing shell.

EFFECT: possibility of using these pellets as pore-forming agents in production of porous cast blanks by vacuum impregnation from metals and alloys with low fusion point and fusible metals and alloys.

2 cl, 1 tbl, 12 dwg