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Optical crosslinking halogen-free flame-retardant EPT rubber cable material and preparation thereof

A kind of EPDM rubber, photocrosslinking technology, applied in rubber insulators, organic insulators and other directions, can solve the problem of life-threatening, halogen-free flame retardant EPDM cable material, damage to human respiratory tract and other Organs and other problems, to achieve the effect of good flame retardant performance, convenient operation and maintenance, and low product cost

Active Publication Date: 2009-07-22
HONGLONGJIANG ORIENT SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN1106425 introduces the preparation of EPDM rubber flexible wires for mines containing decabromodiphenyl ether / antimony trioxide synergistic flame retardant system by high-energy electron beam radiation method. The product has good flame retardancy and high temperature resistance grade However, when halogenated flame retardants burn, they will release a large amount of toxic smoke and corrosive hydrogen halide gases, which will damage the human respiratory tract and other organs and even threaten life safety. an inevitable trend
So far, there is no technical report on the preparation of halogen-free flame-retardant EPDM cable materials by means of ultraviolet irradiation crosslinking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Drop into 100 parts of E type EPDM in internal mixer by weight, 100 parts of surface modified magnesium hydroxide, 0.8 part of BDK, 1 part of TMPTA, 5 parts of paraffin oil, 0.2 part of antioxidant 1010 and 0.1 part of DLTP, in Mixing at 100-150°C for 8-10 minutes, then extruding into a sheet material through a twin-screw extruder, which is a light-crosslinked EPDM cable material; then melt extrusion coating on the conductive core of the cable The cable is made into an insulating layer or sheath, and then the main wavelength is 200-400nm, and the light intensity is 400-4000mW / cm 2 Ultraviolet light irradiates the insulating layer or sheath with molten ultraviolet light for a few seconds to achieve crosslinking.

[0019] The performance testing data of the ultraviolet cross-linked flame-retardant EPDM cable material prepared in this example are as follows: the tensile strength is 8.6 MPa, the elongation at break is 480%, the oxygen index is 30%, and the volume resistivit...

Embodiment 2

[0021] Drop into 100 parts of E-type EPDM in internal mixer by weight, 120 parts of surface modified magnesium hydroxide, 1.5 parts of BP, 1.5 parts of TAIC, 5 parts of paraffin oil, 0.2 part of antioxidant 1010, 0.1 part of DLTP, at 100 Mix at -150° C. for 8-10 minutes, and then extrude into flakes through a twin-screw extruder. Other operations are the same as in Example 1.

[0022] The performance testing data of the ultraviolet cross-linked flame-retardant EPDM cable material prepared in this example are as follows: the tensile strength is 8.0 MPa, the elongation at break is 440%, the oxygen index is 32%, and the volume resistivity is 6.4 ×10 14 Ω.cm, can pass the thermal aging test at 135℃×168h.

Embodiment 3

[0024] Put 100 parts of E-type EPDM into the internal mixer by weight, 100 parts of surface modified aluminum hydroxide, 1.2 parts of BDK, 0.8 parts of BP, 3 parts of TAIC, 5 parts of paraffin oil, 0.6 parts of antioxidant 168, and 0.3 parts of DTDTP , mixed at 100-150° C. for 8-10 minutes, and then extruded into flakes through a twin-screw extruder. Other operations were the same as in Example 1.

[0025]The performance testing data of the ultraviolet cross-linked flame-retardant EPDM cable material prepared in this example are as follows: the tensile strength is 8.7 MPa, the elongation at break is 450%, the oxygen index is 31%, and the volume resistivity is 8.2 ×10 14 Ω.cm, can pass the thermal aging test at 135℃×168h.

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Abstract

The invention discloses a uv photocrosslinking halogen free flame retarding ethylene propylene diene monomer (EPDM) cable material and a preparation method thereof. The method is characterized by uniformly mixing 100 parts of EPDM, 100-150 parts of metal hydroxid, 0.5-5.0 parts of uv-light initiator, 0.5-5.0 parts of polyfunctional group cross linker, 5.0-10.0 parts of softener and 0.01-1.0 part of compound antioxidant and consequently extruding the mixture into platy material, namely, the photocrosslinking EPDM cable material; then the EPDM cable material is covered on a cable electric lead core by melt extrusion to form an insulating layer or a sheathing layer and subsequently is radiated by uv light with the dominant wavelength of 200-400nm and the light intensity of 400-4000mW / cm for crosslinking; and the tensile strength of the obtained cable insulating layer or the sheathing layer is more than 7.0MPa, the elongation at break is more than 350 percent and the electric volume resistivity is more tan 10Omega.cm. The cable material can pass the thermal aging test at the temperature of 135 DEG C for 168h.

Description

Technical field: [0001] The invention belongs to the technical field of preparation methods of rubber cable materials, and in particular relates to an ultraviolet light cross-linked halogen-free flame-retardant EPDM cable insulation or sheath material and a preparation method thereof. Background technique: [0002] Ethylenepropylene diene monomer (EPDM) is widely used as wire and cable insulation or sheath material because of its excellent electrical properties, high heat and aging resistance, and good low temperature flexibility. However, EPDM rubber is flammable, and its oxygen index is only about 20%. Therefore, it is required to use flame-retardant EPDM rubber wires and cables in many occasions, especially in rail transit, nuclear power and mines. demanding occasions. [0003] Chinese patent CN1106425 introduces the preparation of EPDM rubber flexible wires for mines containing decabromodiphenyl ether / antimony trioxide synergistic flame retardant system by high-energy e...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08K13/02C08K3/22C08K5/06C08K5/07C08K5/08C08K5/103C08K5/32C08J3/24H01B3/28
Inventor 瞿保钧鲍文波宋旭鹏马树军吴强华贾振山施文芳李巍张红祁鑫
Owner HONGLONGJIANG ORIENT SCI & TECH
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