HIGH-TEMPERATURE POLYFOAMS WITH REDUCED RESIN ABSORPTION FOR MANUFACTURE OF MULTILAYERED STRUCTURE MATERIALS Russian patent published in 2022 - IPC B29C44/34 B29C44/36 B29C44/44 B29C44/56 B29C44/58 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method for the production of high-temperature polyfoams (hereinafter – HT-polyfoams) for their further recycling to multilayered structure materials, which are used in aircraft building, shipbuilding, railway engineering, and automotive industry. This method includes foaming of particles of high-temperature polymer (hereinafter – HT-polymer) and sintering at a sintering temperature T₁ in a mold to form a molded product of HT-polyfoam. Next, a mold cavity is heated to a temperature T₂, which is at least 10°C higher than the sintering temperature and at most 20°C higher than a glass transition temperature of HT-polymer, with exposure to this temperature for 5-120 s. HT-polymer is polyetherimide (PEI). The sintering temperature T₁ of HT-polymer is 140-220°C. The glass transition temperature of HT-polymer is 210-235°C. The temperature T₂ is within 180-225°C.

EFFECT: development of a non-energy intensive method for the production of HT-polyfoams with maximum solid surface.

7 cl, 3 dwg, 1 ex