PROCESS FOR FOAMING USING CARBON DIOXIDE SOLUTION

    公开(公告)号:US20230374244A1

    公开(公告)日:2023-11-23

    申请号:US18228684

    申请日:2023-08-01

    摘要: The invention relates to a foaming process using carbon dioxide solution, comprising: put a parison into the carbon dioxide solution for primary foaming, remove and put the parison into the carbon dioxide solution for secondary foaming to get the foam product. Compared with foaming process using high-pressure gas directly, the foaming process using polar liquid system can get a uniform foam structure with high foaming rate faster, and has good foaming effect for high crystalline polymers. To control the change of temperature and pressure after the introduction of carbon dioxide, the impact and penetration of carbon dioxide on the surface of the crosslinked material can be controlled first, and the solubility of carbon dioxide in the polar system can be improved by further increasing pressure and temperature, thereby promoting the formation of uniform foam structure with high foaming rate in the subsequent heat foaming process.

    MODIFIED SILICONE RESIN FOAM
    9.
    发明申请

    公开(公告)号:US20180312653A1

    公开(公告)日:2018-11-01

    申请号:US16029003

    申请日:2018-07-06

    发明人: Chiaki Katano

    IPC分类号: C08J9/08

    摘要: A modified silicone resin foam is obtained by curing a foamable liquid resin composition including: 100 parts by weight of a base material resin (A) composed of 65 to 95 parts by weight of a polymer (a) and 5 to 35 parts by weight of a reactive plasticizer (b); 0.1 to 5 parts by weight of a silanol condensation catalyst (B); and 2 to 40 parts by weight of a chemical foaming agent (C). The polymer (a) contains 1.0 to 2.0 reactive silicon groups in a molecular chain and has a main chain comprising oxyalkylene-based units. The reactive plasticizer (b) is a polymer containing 1.0 or fewer reactive silicon groups at one terminal end of a molecular chain and has a main chain comprising oxyalkylene-based units. A percent elongation of the foam is 300 to 1000% in a 25° C. atmosphere.