摘要:
The present invention provides a water-proof sound-transmitting membrane including a polytetrafluoroethylene (PTFE) porous membrane, in which the waterproofness is enhanced further with little lowering of the sound transmittance. The water-proof sound-transmitting membrane includes the PTFE porous membrane. The PTFE porous membrane includes a first porous layer, and a second porous layer stacked on and integrated with the first porous layer by a binding force acting between PTFE matrices. The first porous layer and the second porous layer each are composed of PTFE with a number-average molecular weight of 5.0×107 or more determined by a standard specific gravity method. At least one layer selected from the first porous layer and the second porous layer has an average pore diameter of 1 μm or less. The water-proof sound-transmitting membrane has a surface density of 1 g/m2 to 10 g/m2.
摘要翻译:本发明提供一种防水透声膜,其包括聚四氟乙烯(PTFE)多孔膜,其中防水性进一步增强,声透射率几乎不降低。 防水透声膜包括PTFE多孔膜。 PTFE多孔膜包括第一多孔层和通过作用在PTFE基质之间的结合力堆叠在第一多孔层上并与其一体化的第二多孔层。 第一多孔层和第二多孔层各自由通过标准比重法测定的数均分子量为5.0×10 7以上的PTFE构成。 从第一多孔层和第二多孔层中选择的至少一层的平均孔径为1μm以下。 防水透声膜的表面密度为1g / m 2〜10g / m 2。
摘要:
Disclosed is a process for production of a polytetrafluoroethylene (PTFE) sheet, which is superior in productivity compared to conventional processes and can reduce the cost of production. Also disclosed is a process for production of a PTFE seal tape. The processes comprise the following steps (i) to (iii): (i) applying a force to a PTFE particle suspension comprising PTFE particles, a surfactant and water (a dispersion medium) so that the particles can come close to each other or contact with each other, thereby forming a PTFE-containing solid material having the water and the surfactant included therein; (ii) shaping the solid material into a sheet-like form; and (iii) reducing the water content in the sheet-like solid material.
摘要:
The present invention provides a method of manufacturing a polytetrafluoroethylene (PTFE) product offering better productivity and a higher degree of flexibility in form of the product to be obtained than the conventional methods of manufacturing a PTFE product, and a method of manufacturing PTFE particle aggregate obtained as an intermediate while manufacturing a PTFE product. According to the manufacturing methods, aggregate of PTFE particles including water and a surfactant is obtained by applying force to a dispersion of PTFE particles containing PTFE particles, a surfactant and water as a dispersion medium, where the force makes the PTFE particles approach or contact with each other. Such a manufacturing method may be carried out, for example, with a chamber (1) shown in FIG. 1.