Light electromagnetic shielding heat shrinkable tube and preparation method thereof
A technology of electromagnetic shielding and electromagnetic shielding layer, which is applied in the field of lightweight electromagnetic shielding heat shrinkable tube and its preparation, can solve the problems of increasing product weight, decreasing mechanical properties, and difficulty in expanding, and achieves low overall weight, low surface resistivity, The effect of excellent mechanical strength
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[0041] The present invention also provides a preparation method of a lightweight electromagnetic shielding heat shrinkable tube, comprising the following steps:
[0042] a) Prepare conductive fiber fabric tubes, adhesive tubes and heat-shrinkable tubes respectively; the conductive fiber fabric tubes are woven from conductive fibers, the conductive fibers have a core-shell structure, the core layer is a non-conductive fiber, and the shell layer includes conductive fibers. polyaniline and carbon nanotubes;
[0043] b) Put the conductive fiber fabric tube on the mandrel, then put the bonding tube on the conductive fiber fabric tube, then put the heat shrinkable tube on the bonding tube, heat the Shrink to get lightweight electromagnetic shielding heat shrink tubing.
[0044] In the preparation method provided by the present invention, the conductive fiber fabric tube, the adhesive tube and the heat-shrinkable tube are firstly prepared respectively. Wherein, the conductive fiber...
Embodiment 1
[0073] (1) Get the following raw materials by mass and add them to the high-speed mixer: 50 parts of ethylene vinyl acetate copolymer (EVA220, DuPont, USA, VA content 28wt%), 30 parts of linear low density polyethylene (41E68, DuPont, USA), ethylene acrylic acid Methyl ester copolymer (1218AC, American Dupont, MA content 18wt%) 20 parts, flame retardant magnesium hydroxide 15 parts and ammonium polyphosphate (relative molecular mass 1500, phosphorus content 30wt%) 10 parts, antioxidant 10765 parts, 2 parts of cross-linking sensitizer triallyl isocyanurate (acid value <0.2mgKOH / g), 2 parts of lubricant stearic acid (type 1840). Mix at high speed for 5-10 minutes, extrude and granulate at 120-160°C in an internal mixer or a twin-screw extruder to obtain pellets. Afterwards, the pellets are put into a single-screw extruder, and extruded at 100-150° C. to obtain pipes. The tube is then radiated and cross-linked by an electron accelerator at 12Mrad, and finally expanded by 3 times...
Embodiment 2
[0080] (1) Take the following raw materials by mass and add them to the internal mixer: 50 parts of silicone rubber (RBB-2100-70, Dow Corning, USA, Shore A hardness 70), EPDM rubber (7001, ExxonMobil, USA, Ethylene mass fraction 73wt%) 20 parts, fluorosilicone raw rubber (LS-4960, U.S. Dow Corning, Shore A hardness 60) 10 parts, the fumed silica ( 2#) 12 parts, flame retardant magnesium hydroxide 10 parts, pentaerythritol 8 parts, antioxidant 10102 parts, knead at 150-180°C for 2-3 hours. Then add 1.5 parts of vulcanizing agent dicumyl peroxide to the internal mixer, continue mixing at 140-170°C for 2-3 hours, then extrude the compounded rubber in the extruder at 135-170°C, and press The rubber tube is vulcanized and shaped at 140-180°C in the equipment, and finally expanded 3 times at 120-165°C to obtain an outer heat-shrinkable tube with an inner diameter of about 10mm and a thickness of about 0.8mm;
[0081] In step (1), the gas-phase silica (2#) treated with the coupling ...
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