A kind of electromagnetic shielding sheath and preparation method thereof
An electromagnetic shielding and sheathing technology, which is applied in the direction of cable/conductor manufacturing, equipment for manufacturing conductive/semiconductive layers, circuits, etc., can solve the problems of reducing the efficiency of shielding sheath installation and disassembly, and avoid accelerated aging , easy to use, and the effect of improving thermal conductivity
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[0033] Among the present invention, the preparation method of electromagnetic shielding sheath comprises the following steps:
[0034] (1) Mix silicon dioxide, metal powder and an emulsifier, add a dispersant, heat in a water bath and stir for 30-40 minutes, then centrifuge, wash and dry the filter residue to obtain a filler mixture;
[0035] (2) Blanking the filler mixture and polyethylene resin in the step (1) into the sheath extruder and extruding to obtain the inner sheath layer;
[0036] (3) spraying conductive paste on the surface of the inner sheath layer in step (2) to form an electromagnetic shielding layer with a thickness of 0.5 to 2 mm;
[0037] (4) blanking polyvinyl chloride resin and ceramic fiber into the sheath extruder, forming an outer sheath layer outside the electromagnetic shielding layer of step (3), to obtain a tubular sheath;
[0038] (5) Cut a helical dividing line on the tubular sheath along its length direction to obtain the electromagnetic shieldi...
Embodiment 1
[0042] A kind of preparation method of electromagnetic shielding sheath:
[0043] (1) Weigh 5kg of silicon dioxide (purchased from Foshan Lianjie Silicon Material Co., Ltd., ultrafine type 2 silica, particle size is 2μm), 8kg of copper powder (purchased from Nangong Xindun alloy welding material The electrolytic copper powder produced by Spraying Co., Ltd. (300 meshes) was mixed with alkylphenol polyoxyethylene ether (purchased from Xingtai Xinlanxing Technology Co., Ltd., the brand is OP-4), and magnesium stearate (purchased from Magnesium stearate produced by Kaixiang Chemical Industry), heated and stirred in a water bath at 75° C. for 35 minutes, and centrifuged under the conditions of centrifugal speed 200 r / s, centrifugation time 8 minutes, the filter residue was washed and dried to obtain the filler mixture;
[0044] (2) take by weighing 85kg of polyethylene resin (purchased from Maoming Petrochemical, high-density polyethylene resin, the trade mark is DFDA8916), and the...
Embodiment 2
[0049] A kind of preparation method of electromagnetic shielding sheath:
[0050] (1) Weigh 3kg of silicon dioxide (purchased from Foshan Lianjie Silicon Material Co., Ltd., ultrafine type 2 silica, particle size is 2μm), 5kg of silver powder and alkylphenol polyoxyethylene ether (purchased from Xingtai Xinlanxing Technology Co., Ltd. (brand name is OP-4) mixed, added magnesium stearate (purchased from Kaixiang Chemical Industry, magnesium stearate), heated and stirred in a water bath at 75°C for 30min, centrifuged, and centrifuged The conditions are: the centrifugal speed is 200r / s, the centrifugal time is 5min, and the filter residue is washed and dried to obtain the filler mixture;
[0051] (2) take by weighing 80kg of polyethylene resin (purchased from Maoming Petrochemical, high-density polyethylene resin, the trade mark is DFDA8916), and the filler mixture in step (1) is fed into the sheath extruder by weight loss, through Extrude after melting and kneading to obtain th...
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