Study on Preparing High Strength Meta-aramid Paper by Aramid Resin Solution Impregnation Combined with Cold Pressing
In this study,a new process for preparing meta-aramid paper was proposed using homogeneous and homologous aramid resin solu-tion impregnation combined with cold pressing.The strong polar molecules in the aramid resin solution caused partially swelling and dissolv-ing meta-aramid fibers,while the resulting regenerated aramid polymers could fill the pores.At the same time,the contact area of the fibres under pressure was significantly increased,resulted in more hydrogen bonding.Thus,the structural denseness and physical properties of the paper had been further improved.Combined with response surface method,the process parameters were optimized with drying time,drying temperature,and cold pressing pressure as independent variables,and tensile strength and breakdown strength as response values.The re-sults showed that the tensile strength,Young's modulus,and breakdown strength of the meta-aramid paper prepared under the optimum con-ditions(drying time of 2.1 min,drying temperature of 79.8 ℃,and cold pressing pressure of 17.27 MPa)were 36.93 MPa,887.13 MPa,and 16.42 kV/mm,respectively.Compared with the meta-aramid paper prepared by hot pressing process,they increased by 119％,127％,and 4％,respectively.
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