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21 条记录 (耗时 0.027 秒)

    Free-flowing sintering powders which have improved properties and are based on tetrafluoroethylene polymers and a process for their manufacture
    14.
    发明授权
    Free-flowing sintering powders which have improved properties and are based on tetrafluoroethylene polymers and a process for their manufacture 失效
    具有改进性能并且基于四氟乙烯聚合物的自由流动的烧结粉末及其制造方法

    公开(公告)号：US4408007A

    公开(公告)日：1983-10-04

    申请号：US417122

    申请日：1982-09-13

    申请人： Jurgen Kuhls ,  Robert Hartwimmer

    发明人： Jurgen Kuhls ,  Robert Hartwimmer

    IPC分类号： C08J3/12 ,  C08F14/00 ,  C08F14/26 ,  C08F214/26 ,  C08F259/08 ,  C08J3/16 ,  C08L1/00 ,  C08L27/00 ,  C08L27/12 ,  C08L27/18 ,  C08F114/26

    CPC分类号： C08J3/16 ,  C08F14/26 ,  C08F259/08 ,  C08J2327/18

    摘要： Free-flowing sintering powders based on polymers containing at least 98.5% by weight of tetrafluoroethylene units can be prepared from colloidal polymer dispersions obtained in a customary manner by emulsion polymerization, stirring being carried out initially, optionally with the addition of an inorganic salt, until thickening, indicated by optical inhomogeneities, is achieved, an organic liquid which wets the polymer particles and is soluble in water to the extent of not more than 15% by weight then being added and stirring then being continued until granules are produced. The polymers preferably contain up to 1.5% by weight of polymerized units of at least one modifying, perfluorinated monomer. The free-flowing sintering powders have a high bulk density, an excellent flow time and further advantageous properties. They can be provided with customary fillers and are suitable for ram extrusion and for press-sinter processing to give sintered blocks and subsequently veneer-cut films.

    摘要翻译： 基于含有至少98.5重量％的四氟乙烯单元的聚合物的自由流动的烧结粉末可以由通过乳液聚合以常规方式获得的胶体聚合物分散体制备，首先进行搅拌，任选地加入无机盐，直到 实现了由光学不均匀性指示的增稠，将聚合物颗粒润湿并且可溶于水的程度不大于15重量％的有机液体，然后加入并搅拌，然后继续直到制备颗粒。 聚合物优选含有至多1.5重量％的至少一种改性全氟化单体的聚合单元。 自由流动的烧结粉末具有高的堆积密度，优异的流动时间和更好的性能。 它们可以提供常规的填料，适用于冲压挤出和压坯烧结加工，得到烧结块和随后的单板切割薄膜。

    Molding powder comprising agglomerated particles of PTFE compounds
    18.
    发明授权
    Molding powder comprising agglomerated particles of PTFE compounds 失效
    包含聚四氟乙烯化合物颗粒的成型粉末

    公开(公告)号：US4774304A

    公开(公告)日：1988-09-27

    申请号：US21168

    申请日：1987-03-03

    申请人： Jurgen Kuhls ,  Eduard Weiss ,  Gottfried Burgstaller

    发明人： Jurgen Kuhls ,  Eduard Weiss ,  Gottfried Burgstaller

    IPC分类号： C08J3/16 ,  C08F14/00 ,  C08F16/00 ,  C08F16/14 ,  C08F214/26 ,  C08J3/12 ,  C08F16/24

    CPC分类号： C08J3/12 ,  C08J3/16 ,  C08J2327/18 ,  Y10T428/2982

    摘要： A process for the continuous agglomeration of granular tetrafluoroethylene polymer powders which cannot be processed from the melt to give molding powders having a high bulk density, an improved powder flow and particle stability and a narrow particle size distribution is described. In this process, the powder to be agglomerated is first introduced uniformly into a pretreatment stage and is dispersed and pre-agglomerated in this stage in the liquid agglomeration medium, composed of water and an organic liquid capable of wetting polytetrafluoroethylene, is then agglomerated to the desired average particle diameter in an agglomeration stage and is finally treated further in an after-treatment stage in order to develop the final shape of the particles. Finally, the powder is separated from the liquid medium and is dried. This makes it possible to obtain, in an economical manner and with excellent processing properties, high-grade agglomerated molding powders of such tetrafluoroethylene polymers, in particular of such polymers which have been modified with small quantities of perfluoro-(alkyl-vinyl) ethers.

    摘要翻译： 描述了不能从熔体中加工的颗粒状四氟乙烯聚合物粉末的连续附聚以提供具有高堆积密度，改进的粉末流动和颗粒稳定性以及窄的粒度分布的成型粉末的方法。 在该方法中，首先将待凝聚的粉末均匀地引入预处理阶段，并在此阶段中分散和预凝聚在由水和能够润湿聚四氟乙烯的有机液体组成的液体聚集介质中，然后聚集到 在附聚阶段中期望的平均粒径，并且最终在后处理阶段进一步处理，以便形成颗粒的最终形状。 最后，将粉末与液体介质分离并干燥。 这使得可以以经济的方式和优异的加工性能获得这种四氟乙烯聚合物的高级聚集成型粉末，特别是已经用少量全氟 - （烷基 - 乙烯基）醚改性的这种聚合物。

    Continuous process for the agglomeration of PTFE powders in a liquid medium
    19.
    发明授权
    Continuous process for the agglomeration of PTFE powders in a liquid medium 失效
    用于在液体介质中聚集PTFE粉末的连续方法

    公开(公告)号：US4439385A

    公开(公告)日：1984-03-27

    申请号：US413716

    申请日：1982-09-01

    申请人： Jurgen Kuhls ,  Eduard Weiss ,  Gottfried Burgstaller

    发明人： Jurgen Kuhls ,  Eduard Weiss ,  Gottfried Burgstaller

    IPC分类号： C08J3/16 ,  C08F14/00 ,  C08F16/00 ,  C08F16/14 ,  C08F214/26 ,  C08J3/12 ,  B01J2/12

    CPC分类号： C08J3/12 ,  C08J3/16 ,  C08J2327/18 ,  Y10T428/2982

    摘要： A process for the continuous agglomeration of granular tetrafluoroethylene polymer powders which cannot be processed from the melt to give molding powders having a high bulk density, an improved powder flow and particle stability and a narrow particle size distribution is described. In this process, the powder to be agglomerated is first introduced uniformly into a pretreatment stage and is dispersed and pre-agglomerated in this stage in the liquid agglomeration medium, composed of water and an organic liquid capable of wetting polytetrafluoroethylene, is then agglomerated to the desired average particle diameter in an agglomeration stage and is finally treated further in an after-treatment stage in order to develop the final shape of the particles. Finally, the powder is separated from the liquid medium and is dried. This makes it possible to obtain, in an economical manner and with excellent processing properties, high-grade agglomerated molding powders of such tetrafluoroethylene polymers, in particular of such polymers which have been modifed with small quantities of perfluoro-(alkyl-vinyl) ethers.

    摘要翻译： 描述了不能从熔体中加工的颗粒状四氟乙烯聚合物粉末的连续附聚以提供具有高堆积密度，改进的粉末流动和颗粒稳定性以及窄的粒度分布的成型粉末的方法。 在该方法中，首先将待凝聚的粉末均匀地引入预处理阶段，并在此阶段中分散和预凝聚在由水和能够润湿聚四氟乙烯的有机液体组成的液体聚集介质中，然后聚集到 在附聚阶段中期望的平均粒径，并且最终在后处理阶段进一步处理，以便形成颗粒的最终形状。 最后，将粉末与液体介质分离并干燥。 这使得可以以经济的方式和优异的加工性能获得这种四氟乙烯聚合物的高级聚集成型粉末，特别是已经用少量全氟（烷基 - 乙烯基）醚改性的这种聚合物。

    Concentrated dispersions of fluorinated polymers and process for their preparation
    20.
    发明授权
    Concentrated dispersions of fluorinated polymers and process for their preparation 失效
    氟化聚合物的浓缩分散体及其制备方法

    公开(公告)号：US4369266A

    公开(公告)日：1983-01-18

    申请号：US125463

    申请日：1980-02-28

    申请人： Jurgen Kuhls ,  Eduard Weiss

    发明人： Jurgen Kuhls ,  Eduard Weiss

    IPC分类号： C08J3/02 ,  C08C1/075 ,  C08F6/20 ,  C08L3/00 ,  C08L27/12 ,  C08L27/18 ,  C09D127/12 ,  C08L3/16

    CPC分类号： C08F6/20 ,  B01D61/58 ,  B01D2311/06 ,  B01D61/025 ,  B01D61/145

    摘要： Aqueous colloidal dispersions of fluorinated polymers can be concentrated, after adding a stabilizing emulsifier, to high solids contents by ultrafiltration over customary semi-permeable membranes if pumps which keep the dispersion free from contact with components which cause frictional forces are used for conveying the dispersion. A considerable proportion of the stabilizing emulsifier added and high proportions of the fluorine-containing emulsifier originally contained in the fluorinated polymer dispersion from the emulsion polymerization can be removed via the aqueous permeate. The fluorine-containing emulsifier can be recovered by a downwstream basic anion exchanger and the stabilizing emulsifier contained in the filtrate flowing out of the anion exchanger can be concentrated in this filtrate by reverse osmosis and optionally recycled into the ultrafiltration process. Fluorinated polymer dispersions which, in addition to having a high solids content, are distinguished by particularly low contents of fluorine-containing emulsifier and of stabilizing emulsifier can be obtained. The process can be applied to all known aqueous, colloidal dispersions of fluorinated homopolymers and copolymers.

    摘要翻译： 如果将保持分散体与导致摩擦力的部件接触的泵与使用摩擦力的部件接触的泵用于输送分散体，则氟化聚合物的水性胶体分散体可以在通过常规半透膜之后通过超滤将高稳定性乳化剂加入到高固体含量之后进行浓缩。 最初含有乳化聚合物的含氟聚合物分散体中含有相当比例的稳定化乳化剂和高比例的含氟乳化剂可通过含水渗透物除去。 含氟乳化剂可以通过下游碱性阴离子交换剂回收，并且流出阴离子交换剂的滤液中所含的稳定乳化剂可以通过反渗透浓缩在该滤液中，并任选地再循环到超滤过程中。 通过特别低含量的含氟乳化剂和稳定化乳化剂，可以获得含有高固含量的氟化聚合物分散体。 该方法可以应用于所有已知的氟化均聚物和共聚物的水性胶体分散体。