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Flame-retardant natural rubber sheath for cables and preparation method thereof

A natural rubber and cable technology, applied in the direction of insulating cables, rubber insulators, cables, etc., to achieve the effect of preventing combustion reactions

Active Publication Date: 2016-08-24
滁州君越高分子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The buffer layer of the cable is mostly composed of rubber. The existing rubber buffer layer can only play a buffer role. In the case of accidental fire, the rubber will decompose into flammable low-molecular substances at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The invention provides a preparation method of a flame-retardant natural rubber sheath for cables, the preparation method comprising:

[0014] a. Mix natural rubber, cresyl diphenyl phosphate, chlorinated paraffin, magnesium bicarbonate, decabromodiphenyl ether, boehmite and sodium molybdate to make masterbatch;

[0015] B, vulcanizing agent and described masterbatch are mixed to carry out vulcanization treatment for the first time;

[0016] c. Carrying out the second vulcanization of the masterbatch after the first vulcanization in an oven to make flame-retardant natural rubber for cables;

[0017] d. extruding the flame-retardant natural rubber for the cable into a flame-retardant natural rubber sheath for the cable.

[0018] In step a of the present invention, the amount of each raw material can be selected in a wide range, but in order to make the flame-retardant natural rubber for cables that is prepared have more excellent flame retardancy, preferably, in step a,...

Embodiment 1

[0027] a. 100kg of natural rubber sleeve with the brand name SVR-3L, 140kg of cresyl diphenyl phosphate, 5kg of chlorinated paraffin-50, 45kg of magnesium bicarbonate, 6kg of decabromodiphenyl ether, 9kg of boehmite and molybdic acid Mix 0.8kg of sodium to make masterbatch;

[0028] 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;

[0029] c. At 215°C, the masterbatch after the first vulcanization is vulcanized for the second time in an oven for 4 hours to make a flame-retardant natural rubber for cables;

[0030] d. Extrude and mold the flame-retardant natural rubber for the cable to make the flame-retardant natural rubber sheath A1 for the cable.

[0031] The flame retardant performance parameters of the flame retardant natural rubber sheath for the cable are shown in Table 1.

Embodiment 2

[0033] a. The brand is 100kg of natural rubber of SVR-3L, 150kg of cresyl diphenyl phosphate, 7kg of chlorinated paraffin-50, 55kg of magnesium bicarbonate, 8kg of decabromodiphenyl ether, 10kg of boehmite and sodium molybdate 1.2kg mixed to make masterbatch;

[0034] 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;

[0035] c. At 220°C, the masterbatch after the first vulcanization is vulcanized for the second time in an oven for 5 hours to make a flame-retardant natural rubber for cables;

[0036] d. The flame-retardant natural rubber for cables is extruded to form a flame-retardant natural rubber sheath A2 for cables.

[0037] The flame retardant performance parameters of the flame retardant natural rubber sheath for the cable are shown in Table 1.

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PUM

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Abstract

The invention discloses a flame-retardant natural rubber jacket for cables and a preparation method thereof. The preparation method comprises the following steps: a, mixing natural rubber, cresyl diphenyl phosphate, chlorinated paraffin, magnesium bicarbonate, decabromodiphenyl diphenyl ether, boehmite and sodium molybdate to prepare masterbatch rubber; b, mixing a vulcanizing agent and masterbatch rubber to carry out first vulcanization treatment; c, carrying out second vulcanization treatment on the masterbatch rubber subjected to first vulcanization treatment in a drying box to prepare the flame-retardant natural rubber for cables; and d, carrying out extrusion molding on the flame-retardant natural rubber for the cables to prepare the flame-retardant natural rubber jacket for the cables. The flame-retardant natural rubber jacket for the cables prepared by the method has excellent flame-retardant property.

Description

technical field [0001] The invention relates to rubber, in particular to a flame-retardant natural rubber sheath for cables. Background technique [0002] The buffer layer of the cable is mostly composed of rubber. The existing rubber buffer layer can only play a buffer role. In the case of an accidental fire, the rubber will decompose into flammable low-molecular substances at high temperatures. The flammable low-molecular-weight substances will quickly undergo a violent oxidation reaction with oxygen, and the oxidation reaction will release a large amount of heat, which will further promote the decomposition of rubber. Oxidation reaction until the rubber burns out. Contents of the invention [0003] The object of the present invention is to provide a flame-retardant natural rubber sheath for cables and a preparation method thereof. The flame-retardant natural rubber sheath for cables prepared by the method has excellent flame retardancy. [0004] In order to achieve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08L91/06C08K13/02C08K5/523C08K3/26C08K5/06C08K3/34C08K3/24B29C35/02H01B7/17
CPCB29C35/02C08L7/00C08L2201/02C08L2203/202C08L2205/025C08L2205/03H01B3/28H01B7/18C08L91/06C08K13/02C08K5/523C08K3/26C08K5/06C08K3/34C08K3/24
Inventor 佘晨何成龙何源杨趁芬
Owner 滁州君越高分子新材料有限公司