Twin-screw extrusion of silicone doughs suited for SiH/SiVi RTV
compositions
    111.
    发明授权
    Twin-screw extrusion of silicone doughs suited for SiH/SiVi RTV compositions 失效
    适用于SiH / SiVi RTV组合物的硅胶面团的双螺杆挤出

    公开(公告)号:US5531923A

    公开(公告)日:1996-07-02

    申请号:US237997

    申请日:1994-05-04

    CPC分类号: C08K9/06 B29C47/40 C08K13/02

    摘要: Silicone doughs suitable for incorporation into diorganopolysiloxane compositions crosslinkable into elastomeric state are rapidly and conveniently formulated by continuously and simultaneously individually introducing along the longitudinal axis of a twin-screw extruder, via a plurality of longitudinally spaced discrete inlet entries, and twin-screw extruding (a) a polydiorganosiloxane oil having a viscosity at 25.degree. C. of less than 500,000 mPa.s and containing at least two .tbd.Si-CH=CH.sub.2 functional groups per molecule, (b) water, (c) silica, and (d) a polysilazane which is liquid under normal conditions of temperature and pressure.

    摘要翻译: 适于掺入可交联成弹性体状态的二有机基聚硅氧烷组合物中的硅酮面团通过连续且同时地通过多个纵向间隔开的离散入口入口和双螺杆挤出机沿着双螺杆挤出机的纵向轴线单独引入而快速且方便地配制 a)在25℃下粘度低于500,000mPa.s并且每分子含有至少两个3BOND Si-CH = CH 2官能团的聚二有机硅氧烷油,(b)水,(c)二氧化硅和(d) 在正常温度和压力条件下为液体的聚硅氮烷。

    Process to enhance the tensile strength of reclaimed sand bonded with
ester cured alkaline phenolic resin
    120.
    发明授权
    Process to enhance the tensile strength of reclaimed sand bonded with ester cured alkaline phenolic resin 失效
    提高用酯固化碱性酚醛树脂粘结的再生砂的拉伸强度的工艺

    公开(公告)号:US5238976A

    公开(公告)日:1993-08-24

    申请号:US953121

    申请日:1992-11-12

    申请人: S. Raja Iyer

    发明人: S. Raja Iyer

    摘要: The present invention provides methods for treating reclaimed sand obtained from dismantled foundry molds and cores which contain a cured binder derived from an ester cured alkaline phenolic resin. Treatment of the reclaimed sand with a silane solution, particularly an aqueous solution, enhances the tensile strengths of foundry molds and cores produced therefrom beyond those obtained with untreated reclaimed sand. Methods for producing foundry cores and molds which incorporate such a treatment process are also provided by this invention as are raw batch formulations.

    摘要翻译: 本发明提供了一种处理从拆除的铸造模具和芯中得到的再生砂的方法,该方法含有源自酯固化的碱性酚醛树脂的固化粘合剂。 用硅烷溶液,特别是水溶液处理再生砂,提高了铸造模具和由其生产的芯材的拉伸强度,超过了用未处理的再生砂得到的。 本发明还提供了包含这种处理方法的铸造芯和模具的生产方法,如原料批料配方。