Flame-retardant styrene-butadiene rubber for cables and preparation method thereof
A technology of styrene-butadiene rubber and cables, which is applied in the direction of insulated cables, rubber insulators, cables, etc., to achieve the effect of preventing the combustion reaction
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[0012] The invention provides a preparation method of flame-retardant styrene-butadiene rubber for cables, the preparation method comprising:
[0013] a. Mixing styrene-butadiene rubber, fumed silica, chlorinated paraffin, tribromophenyl acrylate, zinc borate, antimony trioxide and sodium molybdate to make masterbatch;
[0014] B, vulcanizing agent and described masterbatch are mixed to carry out vulcanization treatment for the first time;
[0015] c. The masterbatch after the first vulcanization is vulcanized for the second time in an oven to make flame-retardant styrene-butadiene rubber for cables.
[0016] In step a of the present invention, the amount of each raw material can be selected within a wide range, but in order to make the flame-retardant styrene-butadiene rubber for cables prepared have more excellent flame retardancy, preferably, in step a, relatively For 100 parts by weight of the styrene-butadiene rubber, the amount of the fumed silica is 160-190 parts by we...
Embodiment 1
[0025] a, the brand is styrene-butadiene rubber 100kg of SBS501, the brand is fumed white carbon black 180kg of A200, 5kg chlorinated paraffin-50, tribromophenyl acrylate 45kg, zinc borate 6kg, antimony trioxide 9kg and molybdic acid Mix 0.8kg of sodium to make masterbatch;
[0026] b. At 150°C and 11Mpa, mix 0.5 kg of bis-tert-butyl peroxide cumene and 100 kg of the above masterbatch for 17 minutes for the first vulcanization treatment;
[0027] c. At 215°C, the masterbatch after the first vulcanization was vulcanized for a second time in an oven for 4 hours to prepare flame-retardant styrene-butadiene rubber A1 for cables.
[0028] The flame retardant performance parameters of the flame retardant styrene-butadiene rubber for cables are shown in Table 1.
Embodiment 2
[0030] a, the brand is styrene-butadiene rubber 100kg of SBS501, the brand is fumed white carbon black 190kg of A200, 7kg chlorinated paraffin-50, tribromophenyl acrylate 55kg, zinc borate 8kg, antimony trioxide 10kg and molybdic acid Mix 1.2kg of sodium to make masterbatch;
[0031] b. At 170°C and 12Mpa, mix 0.8 kg of bis-tert-butyl peroxide cumene and 100 kg of the above masterbatch for 20 minutes for the first vulcanization treatment;
[0032] c. At 220°C, the masterbatch after the first vulcanization was vulcanized for the second time in an oven for 5 hours to prepare flame-retardant styrene-butadiene rubber A2 for cables.
[0033] The flame retardant performance parameters of the flame retardant styrene-butadiene rubber for cables are shown in Table 1.
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