Silicone surfactants for rigid polyurethane foam made with third
generation blowing agents
    2.
    发明授权
    Silicone surfactants for rigid polyurethane foam made with third generation blowing agents 失效
    用第三代发泡剂制成的硬质聚氨酯泡沫硅胶表面活性剂

    公开(公告)号:US5883142A

    公开(公告)日:1999-03-16

    申请号:US976979

    申请日:1997-11-25

    摘要: A method for making a rigid polyurethane foam by reacting a polyisocyanate and a polyol in the presence of a urethane catalyst, a blowing agent and a silicone surfactant characterized by employing as a blowing agent a C1-C4 HFC or HCFC, preferably HFC-245fa, and as the silicone surfactant a polyether-polysiloxane coploymer having a total surfactant molecular weight of 12,000 to 100,000 g/mole, a wt % siloxane in the surfactant of 10 to 40 wt %, a molecular weight of the polyether portion of 1200 to 6,000 g/mole, and a wt % of ethylene oxide in the polyether portion of 30-100 wt %.

    摘要翻译: 在氨基甲酸酯催化剂,发泡剂和硅氧烷表面活性剂的存在下使多异氰酸酯和多元醇反应制备硬质聚氨酯泡沫的方法,其特征在于使用作为发泡剂的C1-C4 HFC或HCFC,优选HFC-245fa, 作为有机硅表面活性剂,总表面活性剂分子量为12000〜100000克/摩尔的聚醚 - 聚硅氧烷共聚物,表面活性剂中的硅氧烷wt%为10〜40重量%,聚醚部分的分子量为1200〜6000克 /摩尔,聚醚部分中的环氧乙烷的重量%为30-100重量%。