Preparation of glass fiber paper reinforced polytetrafluoroethylene-based composites
Glass fiber reinforced polytetrafluoroethylene(PTFE)composites are key basic materials used in the field of high-frequency/high-speed electronics.Aiming at the problem that the amount of glue applied to composites prepared by the glass fiber cloth impregnation route is not high.A series of glass fiber paper with uniform structure and high porosity by changing the beating degree of glass wool were prepared using alkali-free glass wool fiber and quartz glass chopped fiber as raw materials,and through further impregnates PTFE emulsion,A series of PTFE-based composite dielectric materials with high resin content were prepared by cold pressing sintering.The effect of paper pore structure on the amount of glue applied was systematically studied,and the perfor-mance of PTFE-based composites under different glue amounts was further explored.The results show that by reducing the beating degree of glass wool,the pore size,air permeability,and porosity of the paper can be effectively improve to obtain a higher glue amount to prepare dielectric substrate materials with better dielectric properties.As the beating degree of glass wool increases from 21°SR to 46°SR,the air permeability of glass fiber paper decreases from 382 mm/s to 55 mm/s,and the average pore size decreases from 8.21 µm to 2.20 µm.When the beating degree of the glass wool used is 21°SR,the porosity of the fabricated glass fiber paper is 89.7%,and the glue content can get as high as 89.17%.Meanwhile,the PTFE-based composite exhibites the best dielectric proper-ties,with a relative dielectric constant of 2.246 and a loss tangent of 1.26‰.
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