NGHIÊN CỨU CHẾ TẠO COMPOSITE TRONG SUỐT ĐIỆN TỪ TRÊN CƠ SỞ POLYESTE

RESEARCH ON THE FABRICATION OF ELECTROMAGNETIC TRANSPARENT COMPOSITE BASED ON POLYESTERIn this paper, the results of the research and selection of single components for manufacturing electromagnetic transparent composite coatings based on polyester resin, curing agent, D-grade glass fiber, military green pigment mixture and additives were presented. The curing agent/resin ratio was selected from 0.71% (ratio 1:140) to 0.91% (ratio 1:110) to obtain composite materials of gelation time from 26 to 37.5 minutes to ensure suitable coating manufacturing process. The influence of coating thickness on mechanical properties and electromagnetic wave transmission properties was determined. Coatings with thickness of less than 1.25mm have a transmittance greater than 93% in the frequency range of 4 ÷ 8 GHz. The obtained composite coating has hight weather resistance (up to 145 cycles in accelerated test in mode: 10h in 5% NaCl solution and 2h in air at room temperature, 10h in the thermostat at 60 ÷ 65oC and then 2h in air at room temperature) and much higher than the common paint system AK-070 + EP-140.