Low-temperature-resistant protective sleeve for underground cable

Abstract

The invention discloses a low-temperature-resistant protective sleeve for underground cables, and belongs to the technical field of cable protection. The protective sleeve is prepared from the following raw materials by weight: 20-30 parts of silicone rubber, 35-45 parts of ethylene propylene diene monomer, 2.5-3.5 parts of white carbon black, 5-8 parts of a vulcanizing agent, 2-5 parts of an accelerator, 3-8 parts of a plasticizer, and 2-4.5 parts of a flame retardant. Compared with a traditional cable protective sleeve and a preparation process thereof, the elongation at break of the protective sleeve at normal temperature reaches 678% or above, the tensile strength reaches 28.6 Mpa or above, and the mechanical performance is excellent; the low-temperature retraction temperature TR10 is -24.5 DEG C or below, and the low-temperature-resistant protective sleeve can keep good elasticity under the low-temperature condition and is suitable for being used in the low-temperature environment; and the oxygen index reaches 48 or above, the flame retardant property is good, the use requirement of the underground cable can be met, the cable can be used in a low-temperature environment, and the service life of the underground cable is prolonged.

Description

technical field

[0001] The invention relates to the technical field of cable protection, in particular to a low-temperature resistant protective sheath for underground cables. Background technique

[0002] In today's society, many cables have also gone underground from the original overhead. The cable is usually a rope-like cable twisted by several or several groups of wires. Each group of wires is insulated from each other, and is often twisted around a center, and the outside is covered with an insulating layer and a protective sheath. Cable protection sheath is a commonly used material for protecting cables. Underground cables are prone to moisture and freezing due to being buried deep underground for a long time. Therefore, there are higher requirements for the performance of the protective sheath. At present, the commonly used cable protective sleeves on the market have poor low temperature resistance and cannot effectively protect underground cables.

[0003] The pat...

Examples

Embodiment 1

[0021] This embodiment provides a low-temperature-resistant protective sheath for underground cables, which is made of the following raw materials in parts by weight: 20 parts of fluorosilicone rubber, 35 parts of EPDM rubber, 2.5 parts of white carbon black, and 5 parts of vulcanizing agent SQS633 , 2 parts of accelerator ZDC, 3 parts of plasticizer dioctyl phthalate, 2 parts of flame retardant decabromodiphenyl ether.

Embodiment 2

[0023] This embodiment provides a low-temperature-resistant protective sheath for underground cables, which is made of the following raw materials in parts by weight: 22 parts of methylphenyl vinyl silicone rubber, 38 parts of EPDM rubber, 2.8 parts of white carbon black, 6 parts of vulcanizing agent SR633, 2.5 parts of accelerator PZ, 5 parts of plasticizer dioctyl sebacate, 2.5 parts of flame retardant zinc borate.

Embodiment 3

[0025] This embodiment provides a low-temperature-resistant protective sheath for underground cables, which is made of the following raw materials in parts by weight: 25 parts of fluorosilicone rubber, 39 parts of EPDM rubber, 3 parts of white carbon black, and 6.5 parts of vulcanizing agent SQS633 , Accelerator PZ 3 parts, plasticizer 5.5 parts, flame retardant 3 parts.

[0026] The plasticizer is a mixture of dioctyl phthalate, dioctyl sebacate, butoxy triethylene glycol adipate, dioctyl phthalate, dioctyl sebacate, butyric The weight ratio of oxytriethylene glycol adipate is 1:2:0.5.

[0027] The flame retardant is a mixture of decabromodiphenyl ether and zinc borate, and the weight ratio of decabromodiphenyl ether: zinc borate is 1:0.3.

technical field

[0001] The invention relates to the technical field of cable protection, in particular to a low-temperature resistant protective sheath for underground cables. Background technique

[0002] In today's society, many cables have also gone underground from the original overhead. The cable is usually a rope-like cable twisted by several or several groups of wires. Each group of wires is insulated from each other, and is often twisted around a center, and the outside is covered with an insulating layer and a protective sheath. Cable protection sheath is a commonly used material for protecting cables. Underground cables are prone to moisture and freezing due to being buried deep underground for a long time. Therefore, there are higher requirements for the performance of the protective sheath. At present, the commonly used cable protective sleeves on the market have poor low temperature resistance and cannot effectively protect underground cables.

[0003] The pat...

Examples

Embodiment 1

[0021] This embodiment provides a low-temperature-resistant protective sheath for underground cables, which is made of the following raw materials in parts by weight: 20 parts of fluorosilicone rubber, 35 parts of EPDM rubber, 2.5 parts of white carbon black, and 5 parts of vulcanizing agent SQS633 , 2 parts of accelerator ZDC, 3 parts of plasticizer dioctyl phthalate, 2 parts of flame retardant decabromodiphenyl ether.

Embodiment 2

[0023] This embodiment provides a low-temperature-resistant protective sheath for underground cables, which is made of the following raw materials in parts by weight: 22 parts of methylphenyl vinyl silicone rubber, 38 parts of EPDM rubber, 2.8 parts of white carbon black, 6 parts of vulcanizing agent SR633, 2.5 parts of accelerator PZ, 5 parts of plasticizer dioctyl sebacate, 2.5 parts of flame retardant zinc borate.

Embodiment 3

[0025] This embodiment provides a low-temperature-resistant protective sheath for underground cables, which is made of the following raw materials in parts by weight: 25 parts of fluorosilicone rubber, 39 parts of EPDM rubber, 3 parts of white carbon black, and 6.5 parts of vulcanizing agent SQS633 , Accelerator PZ 3 parts, plasticizer 5.5 parts, flame retardant 3 parts.

[0026] The plasticizer is a mixture of dioctyl phthalate, dioctyl sebacate, butoxy triethylene glycol adipate, dioctyl phthalate, dioctyl sebacate, butyric The weight ratio of oxytriethylene glycol adipate is 1:2:0.5.

[0027] The flame retardant is a mixture of decabromodiphenyl ether and zinc borate, and the weight ratio of decabromodiphenyl ether: zinc borate is 1:0.3.