CN-120904063-B - Rubber material for cold-shrink type cable accessory, preparation method of rubber material and cold-shrink type cable accessory

Abstract

The invention relates to the technical field of insulating materials, and discloses a rubber material for cold-shrink cable accessories, a preparation method thereof and the cold-shrink cable accessories, wherein the rubber material for cold-shrink cable accessories comprises, by mass, 100 parts of ethylene propylene diene monomer rubber, 40-70 parts of white carbon black, 10-30 parts of kaolin, 5-20 parts of mica powder, 1-5 parts of a silane coupling agent, 2-6 parts of a peroxide vulcanizing agent, 1-4 parts of a crosslinking agent, 5-20 parts of paraffin oil and 1-3 parts of an anti-aging agent. According to the invention, by adopting the anti-aging agent with a specific structure and cooperating with fillers such as white carbon black, calcined kaolin, mica powder and the like, ultraviolet and oxygen aging are effectively resisted from the combined action of physical and chemical layers, the problems of discoloration, cracking and the like of the material in an outdoor complex environment are remarkably slowed down, the electrical performance is maintained stable, and the service life of the material is prolonged.

Inventors

• LIU JIANMING
• QIAO CHUNLIN
• CHEN DONG
• Wan Bocheng

Assignees

• 航大电气有限公司

Dates

Publication Date

20260508

Application Date

20250724

Claims (9)

1. 1. A rubber material for cold-shrink cable accessories, characterized by comprising an anti-aging agent having a structure represented by formula 1: Formula 1; r 1 in the formula 1 is selected from methyl, ethyl, cyano and tert-butyl.
2. 2. The rubber material for cold-shrink cable accessories according to claim 1 is characterized by comprising, by mass, 100 parts of ethylene propylene diene monomer, 40-70 parts of white carbon black, 10-30 parts of kaolin, 5-20 parts of mica powder, 1-5 parts of a silane coupling agent, 2-6 parts of a peroxide vulcanizing agent, 1-4 parts of a crosslinking agent, 5-20 parts of paraffin oil and 1-3 parts of an anti-aging agent.
3. 3. The rubber material for cold-shrink cable accessories according to claim 2, wherein the white carbon black is precipitated white carbon black and the kaolin is calcined kaolin.
4. 4. The rubber material for cold-shrink cable accessories as claimed in claim 2, wherein the mica powder is a 325 mesh to 800 mesh scale-like mica powder.
5. 5. The rubber material for cold-shrink cable accessories as set forth in claim 2, wherein said silane coupling agent is gamma-aminopropyl triethoxysilane.
6. 6. The rubber material for cold-shrink cable accessories as set forth in claim 2, wherein said peroxide vulcanizing agent is dicumyl peroxide; The crosslinking agent is triallyl isocyanurate.
7. 7. A method for producing the rubber material for cold-shrink cable accessories as set forth in any one of claims 1 to 6, characterized by comprising the steps of: s1, adding ethylene propylene diene monomer, white carbon black, kaolin, mica powder and a silane coupling agent into an internal mixer, and mixing for 5-10 minutes at 120-150 ℃; S2, cooling to 80-100 ℃, adding an anti-aging agent and paraffin oil, and mixing for 3-5 minutes; S3, adding a peroxide vulcanizing agent and a crosslinking agent, and mixing for 2-4 minutes at 70-85 ℃ to obtain a mixed rubber; s4, placing the rubber compound into a mold, vulcanizing for 10-30 minutes at 160-180 ℃ and 10-15MPa, and cooling to room temperature to obtain a rubber material for cold-shrink cable accessories; the structure of the anti-aging agent is a compound shown in a formula 1 in claim 1.
8. 8. The method for producing a rubber material for cold-shrink cable accessories according to claim 7, wherein said S2 is performed under a nitrogen atmosphere.
9. 9. Use of the rubber material for cold-shrink cable accessories as claimed in any one of claims 1 to 6 in cold-shrink cable accessories.

Description

Rubber material for cold-shrink type cable accessory, preparation method of rubber material and cold-shrink type cable accessory Technical Field The invention relates to the technical field of insulating materials, in particular to a rubber material for a cold-shrink cable accessory, a preparation method of the rubber material and the cold-shrink cable accessory. Background In the field of prefabricated cable accessories, the performance of the insulating material is of paramount importance. However, the insulating materials of the prior art have significant problems in terms of uv and oxygen aging. Ultraviolet aging is due to the fact that the ultraviolet light energy in sunlight is high, and molecular chains of insulating materials are easy to break. The prefabricated cable accessory is used outdoors and is irradiated by ultraviolet rays for a long time, photochemical reaction can be carried out on the material, such as high polymer materials like ethylene propylene diene monomer, double bonds or benzene ring structures in a molecular chain of the material are easy to absorb ultraviolet energy, chain reaction is initiated, the material is caused to change color and crack, further electrical performance is reduced, such as dielectric strength is reduced, insulation resistance is reduced, the fault risk of the cable accessory is increased, and the stability of a power system is affected. Oxygen aging is also not neglected, oxygen is widely present in the environment and is chemically active, and oxidation reaction occurs with the insulating material. In long-term operation, unsaturated bonds or active groups in the material are combined with oxygen molecules to generate oxidation products such as peroxide and the like, so that the crosslinking density of the material is increased or molecular chains are broken, and the material is hardened, embrittled and loses elasticity. This deterioration in physical properties reduces the abrasion and impact resistance of the material, shortening the useful life of the cable accessory. The existing insulating material has limited effect though aging is delayed by adding an anti-aging agent and other measures. A single aging inhibitor is difficult to cope with a complicated aging environment, and in practical use, the aging inhibitor may migrate or volatilize, resulting in accelerated aging of the material. Accordingly, there is a strong need for an insulating material for prefabricated cable accessories that is effective against ultraviolet and oxygen aging to improve the reliability and service life of the cable accessories. Disclosure of Invention The invention aims to provide a novel prefabricated insulating material for a cable accessory, which remarkably improves the ultraviolet resistance and the oxidation aging resistance of the cable accessory by optimizing a material formula and a preparation process, prolongs the service life of the material, enhances the stability and the reliability of the cable accessory in a complex environment, and meets the requirement of a modern power system on the high performance of the insulating material. In order to achieve the purpose, the technical scheme adopted by the invention is that the rubber material for the cold-shrink cable accessories comprises an anti-aging agent with a structure shown in a formula 1: Formula 1; r 1 in the formula 1 is selected from methyl, ethyl, cyano and tert-butyl. Further, the rubber material for the cold-shrink cable accessories comprises, by mass, 100 parts of ethylene propylene diene monomer, 40-70 parts of white carbon black, 10-30 parts of kaolin, 5-20 parts of mica powder, 1-5 parts of a silane coupling agent, 2-6 parts of a peroxide vulcanizing agent, 1-4 parts of a cross-linking agent, 5-20 parts of paraffin oil and 1-3 parts of an anti-aging agent. Further, the white carbon black is precipitated white carbon black, and the kaolin is calcined kaolin. Further, the mica powder is a 325 mesh to 800 mesh scale-like mica powder. Further, the silane coupling agent is gamma-aminopropyl triethoxysilane. Further, the peroxide vulcanizing agent is dicumyl peroxide. Further, the crosslinking agent is triallyl isocyanurate. Further, the anti-aging agent is any one of the compounds shown in the following structures: ; 。 a preparation method of a rubber material for cold-shrink type cable accessories comprises the following steps: S1, adding the ethylene propylene diene monomer, white carbon black, kaolin, mica powder and a silane coupling agent into an internal mixer, and mixing for 5-10 minutes at 120-150 ℃; s2, cooling to 80-100 ℃, adding the anti-aging agent and paraffin oil, and mixing for 3-5 minutes; S3, adding a peroxide vulcanizing agent and a crosslinking agent, and mixing for 2-4 minutes at 70-85 ℃ to obtain a mixed rubber; s4, placing the rubber compound into a mould, vulcanizing for 10-30 minutes at 160-180 ℃ and 10-15MPa, and cooling to room temperature to obtain the rubber material for t