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    • 7. 发明授权
    • Method of preparing composite chromatographic article
    • 复合色谱制品的制备方法
    • US4971736A
    • 1990-11-20
    • US421280
    • 1989-10-13
    • Donald F. HagenSteven J. St. MaryLouis A. Errede
    • Donald F. HagenSteven J. St. MaryLouis A. Errede
    • B01J20/28
    • B01J20/28033B01J20/28028B01J20/282Y10S264/62
    • A composite chromatographic sheet-like article is prepared by the steps comprising blending one or more non-swellable sorptive hydrophobic particulate materials in the presence of an amount of polar organic masking agent sufficient to allow rapid wetting of the surface of the particulate and in the presence of sufficient lubricant water to exceed the sorptive capacity of the particulate, provided that the volume ratio of water to masking agent does not exceed 3:1, adding with stirring an aqueous emulsion of polytetrafluoroethylene so that the resulting mass has a dough-like consistency, mixing the mass in an intensive mixer at a temperature between 50 C. and 100 C. for a time sufficient to cause fibrillation of the polytetrafluoroethylene particles, biaxially calendering the mass, while maintaining water at a level near the absorptive capacity of the particulate, between a gap in the calendering rolls maintained at about 50 C. to about 100 C. to cause additional fibrillation and consolidation of the polytetrafluoroethylene particles while closing the gap with each successive calendering operation, for a time sufficient to produce a composite chromatographic article having a net surface energy in the range of 20 to 300 milliNewtons per meter, and drying the resultant sheet.
    • 通过以下步骤制备复合色谱片状制品,所述步骤包括在一定量的极性有机掩蔽剂的存在下共混一种或多种不溶胀的吸附性疏水性颗粒材料,所述极性有机掩蔽剂足以允许颗粒表面的快速润湿 足够的润滑剂水超过颗粒的吸附能力,条件是水与掩蔽剂的体积比不超过3:1,在搅拌下加入聚四氟乙烯的水性乳液,使得所得物料具有面团状稠度, 在密集混合器中在50℃和100℃之间的温度下混合物料一段足以使聚四氟乙烯颗粒原纤化的时间,双轴压延该物料,同时将水保持在接近颗粒的吸收能力的水平之间, 压延辊中的间隙保持在约50℃至约100℃,以引起额外的原纤维化和辅助 同时在每个连续的压延操作中封闭间隙的同时,足以产生净表面能为20-300毫牛顿每米的复合色谱制品,并干燥所得到的片材。