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Modified nanometer LDHs low-smoke zero-halogen flame-retardation EPDM (ethylene propylene diene monomer) rubber and preparation method thereof

A kind of EPDM rubber and nanotechnology, which is applied in the field of cable materials, can solve the problems that the dispersion uniformity affects the physical and mechanical properties, the flame retardancy efficiency is low, and the dispersion uniformity is difficult to control, so as to achieve good mechanical and electrical properties, discharge Effects of calorie reduction and dosage reduction

Inactive Publication Date: 2015-12-16
ANHUI PACIFIC CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the flame retardant efficiency is low, and usually a large amount of metal hydroxide flame retardant needs to be added (the metal hydroxide flame retardant needs to account for more than 60% of the dosage of EPDM rubber to meet the actual flame retardant requirements.
Such as the invention patent of CN103589076A, it discloses a kind of radiation-resistant halogen-free flame-retardant cable material and its preparation method, it needs to add 70-150 parts of metal hydroxide flame retardant (metal hydroxide Metal flame retardants account for 70%-150% of the dosage of EPDM rubber, and the usual dosage is: 60 parts of magnesium hydroxide + 40 parts of aluminum hydroxide = 100 parts of metal hydroxide flame retardants, accounting for EPDM 100% of the rubber dosage; or 50 parts of magnesium hydroxide + 70 parts of aluminum hydroxide = 120 parts of metal hydroxide flame retardant, accounting for 120% of the dosage of EPDM rubber), thus seriously affecting the mechanical properties of EPDM, mechanical Performance and process performance
Especially because such a large amount of metal hydroxide flame retardant is difficult to disperse uniformly in EPDM rubber, its dispersion uniformity not only affects the physical and mechanical properties of halogen-free flame-retardant EPDM rubber under normal conditions, but also It also affects the physical and mechanical properties of the halogen-free flame-retardant EPDM rubber after being exposed to fire, or in other words, due to the difficulty in controlling the dispersion uniformity, it seriously affects the quality of the halogen-free flame-retardant EPDM rubber product stability
Especially in reusable occasions such as the manufacture of cables, the unstable quality of halogen-free flame-retardant EPDM products will lead to serious consequences

Method used

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  • Modified nanometer LDHs low-smoke zero-halogen flame-retardation EPDM (ethylene propylene diene monomer) rubber and preparation method thereof

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preparation example Construction

[0022] The preparation method of the modified nano-LDHs low-smoke halogen-free flame-retardant EPDM rubber of the present invention that is matched with the above-mentioned formula comprises the following process steps:

[0023] (1) Mixing of raw rubber—Using an open mill or internal mixer, first mix the raw rubber matrix at 80-100°C, and then cool it to room temperature;

[0024] (2) Adding and kneading—add carbon black, modified hydroxide, plasticizer, synergistic flame retardant, vulcanizing agent, and vulcanization accelerator to the mixed rubber in proportion, and continue to mix evenly to form kneading glue;

[0025] (3) Rubber molding - add the compounded rubber to the single-screw extruder, and control the temperature of the fuselage, screw, and machine head within 65-90°C, and the speed of the screw at 20-40r / min Within, and continuously extruded to form rubber;

[0026] (4) Vulcanized finished product - the extruded rubber is continuously vulcanized by hot air at 1...

Embodiment 1

[0036] (1) According to the mass ratio, take 100 parts of EPDM rubber and maleic acid grafted EPDM copolymer elastomer, or EPDM rubber and ethylene-octene copolymer elastomer. Mill or internal mixer, mix well at 90°C, then cool to room temperature;

[0037] (2) According to the mass ratio, add 35 parts of 50nm carbon black, 50 parts of nano-LDHs composite agent, 40 parts of coupling agent, 45 parts of paraffin oil, 10 parts of microcapsule red phosphorus MRP, 2 parts of sulfur, 1 part of disulfide Dibenzothiazole DM, 1 part of zinc dibutyldithiocarbamate BZ, 1 part of tetramethylthiuram TMTD; also add 4 parts of zinc oxide, 4 parts of stearic acid, and continue to mix to form a mixture rubber mixing;

[0038] (3) Put the compounded rubber into the single-screw extruder, and control the temperature of the fuselage, screw, and machine head within 65-90°C, and control the speed of the screw at 30r / min, and continuously extrude to form rubber material;

[0039] (4) The extruded...

Embodiment 2

[0041] (1) According to the mass ratio, take 100 parts of EPDM rubber and maleic acid grafted EPDM copolymer elastomer, or EPDM rubber and ethylene-octene copolymer elastomer. Mill or internal mixer, mix well at 80°C, then cool to room temperature;

[0042] (2) According to the mass ratio, add 30 parts of 50nm carbon black, 40 parts of nano-LDHs composite agent, 30 parts of coupling agent, 30 parts of paraffin oil, 5 parts of microcapsule red phosphorus MRP, 1 part of sulfur, 0.5 part of disulfide Dibenzothiazole DM, 0.5 parts of zinc dibutyldithiocarbamate BZ, 0.5 parts of tetramethylthiuram TMTD disulfide; also add 3 parts of zinc oxide, 2 parts of stearic acid, and continue to mix uniformly to form a mixture rubber mixing;

[0043] (3) Put the compounded rubber into the single-screw extruder, and control the temperature of the fuselage, screw, and machine head within 65-80°C, and control the speed of the screw within 20r / min, and extrude continuously form glue;

[0044] ...

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Abstract

The invention discloses modified nanometer LDHs low-smoke zero-halogen flame-retardation EPDM (ethylene propylene diene monomer) rubber and a preparation method thereof. The preparation method comprises successively performing raw rubber mixing, addition and mixing, rubber compound forming, sulfuration and obtaining of a finished product. The modified nanometer LDHs low-smoke zero-halogen flame-retardation EPDM rubber is low in smoke, free of halogen, resistant to flame, and good in mechanical properties and electrical performances, and comprises the following compositions in parts by mass: 100 parts of EPDM rubber and a maleic-acid-grafted EPDM rubber copolymer elastomer, or EPDM rubber and an ethylene-octene copolymer elastomer, 40-70 parts of nanometer LDHs complexing agent, 30-60 parts of a coupling agent, 5-15 parts of microcapsule red phosphorus,30-50 parts of 50nm carbon black,3-6 parts of zinc oxide,30-50 parts of paraffin oil,2-5 parts of stearic acid,1-3 parts of sulphur,0.5-2 parts of 2-mercaptobenzothiazyl disulfide,0.5-2 parts of (dibutyldithiocarbamato)zinc(II), and 0.5-3 parts of tetramethylthiuram disulfide.

Description

technical field [0001] The invention relates to the field of cable materials, in particular to a modified nano-LDHs low-smoke, halogen-free, flame-retardant EPDM rubber suitable for manufacturing cables and a preparation method. Background technique [0002] Ethylenepropylene diene monomer (EPDM) is a terpolymer of ethylene, propylene and a non-conjugated diene. Diene has a special structure, which makes EPDM have excellent ozone resistance, heat resistance, weather resistance and other aging resistance and excellent electrical properties, so it is widely used as a material for cable insulation, sheathing, etc., of course, it is also widely used In other industrial fields and civilian products. [0003] EPDM has excellent electrical and mechanical properties, which brings great convenience to industrial production, but at the same time hides a huge fire hazard. EPDM is mainly composed of C, H, and O elements, and is extremely flammable. Therefore, improving the flame retar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L51/04C08L91/06C08K13/06C08K9/06C08K3/26C08K3/04C08K9/10C08K3/02C08K5/47C08K5/39C08K5/40C08K3/22C08K5/09B29B7/00B29C47/00B29C35/04
CPCC08L23/16B29B7/002B29C35/045B29C48/022C08K2201/003C08K2201/011C08L2201/02C08L2201/22C08L2203/202C08L51/04C08L91/06C08K13/06C08K9/06C08K3/26C08K3/04C08K9/10C08K2003/026C08K5/47C08K5/39C08K5/40C08K2003/2296C08K5/09C08L23/0815
Inventor 陈磊崔海洋吕发忠田鸣惠俊恒
Owner ANHUI PACIFIC CABLE CO LTD
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