Wires and cables are used to transmit electrical energy, information and realize electromagnetic energy conversion, and wires and cables with rubber as insulation are widely used in electric power, communications, construction, transportation, industry, agriculture, daily life and other fields. Natural rubber, styrene-butadiene rubber and its combined rubber compounds are widely used in the production of wire and cable insulation rubber and sheath layer; The appropriate use of latex reclaimed rubber can effectively reduce the cost of raw materials on the premise of ensuring product quality.
Rubber wires and cables are mainly composed of five parts: conductive core, insulation, sheath, shielding and outer sheath. In actual production, Hongyun 85% black latex reclaimed rubber is often used in low-grade telecommunication cable sheath layer, low-voltage cable product insulation layer, reduce raw material costs, increase product elasticity and flexibility, and the finished product is folded in half without breaking.
1. Application skills of latex reclaimed rubber in wire and cable sheath layer
The sheath rubber in wires and cables is mainly used to protect the insulation layer from various mechanical and chemical effects from the outside world, and different rubber processing can be used according to the use conditions. Generally, the wire and cable sheath layer produced by natural rubber, natural rubber/styrene-butadiene rubber combined rubber as the main raw materials can be appropriately mixed with latex reclaimed rubber to reduce the cost of raw materials.
Natural rubber/latex reclaimed rubber can be used together to produce sheath rubber compounds, and sulfur-accelerator system or sulfur-free vulcanization system can be used. In the sulfur-accelerator system, the accelerator M/CZ and accelerator M/CZ/TMTD are commonly used with sulfur. The accelerator M or vulcanizing agent JL-1 can be used in combination with the accelerator TMTD in the sulfur-free vulcanization system, and the accelerator DM and EZ can be used in an appropriate amount if necessary, which can effectively avoid the migration of sulfur to the insulating rubber during the vulcanization process.
The cable sheath rubber of the combined production line of natural rubber/styrene butadiene rubber/latex reclaimed rubber can further improve the aging resistance of the rubber compound, and the dosage of vulcanizing agent accelerator in the vulcanization system can be appropriately adjusted to obtain the appropriate vulcanization speed.
2. Application skills of latex reclaimed rubber in the insulation layer of wires and cables
The wire and cable insulation layer is composed of insulating rubber, which is used to ensure the performance of wires and cables, and requires good electrical insulation performance, aging resistance and moisture resistance. When natural rubber/styrene-butadiene rubber is used to produce low-grade wire and cable insulation, an appropriate amount of latex reclaimed rubber can be mixed with latex reclaimed rubber, which can reduce the cost of raw rubber on the premise of ensuring rubber insulation performance.
Natural rubber/styrene-butadiene rubber/latex reclaimed rubber is used together with the production line cable rubber insulation layer, generally using sulfur-free vulcanization system, using accelerator TMTD or VA-7 as vulcanizing agent, accelerator M, accelerator EZ matching, rubber material has high insulation resistance. It should be noted that alkaline accelerators such as accelerator D will increase the water absorption performance of the rubber compound, resulting in a decrease in the electrical properties of vulcanized rubber, and the use of alkaline accelerators should be avoided as much as possible for the production of cable insulation rubber in natural rubber/styrene butadiene rubber/latex reclaimed rubber.
Natural rubber/styrene butadiene rubber/latex reclaimed rubber is used to produce the rubber insulation layer of the production cable, and it is recommended to use non-polluting antioxidant MB, etc., which has little impact on the insulation resistance of the rubber compound; Hygroscopic fillers should not be used, so as not to affect the electrical performance of the rubber compound E4LYY85 In actual production, the commonly used fillers for insulating rubber are talc, activated calcium carbonate, calcined clay treated by silane surface, etc., among which the insulation resistance value of the rubber filled with talc powder is 2-5 times higher than that of the rubber filled with calcium carbonate, especially the ultra-fine talc powder with sheet structure.
When the sheath layer and insulation layer of wires and cables are mixed with latex reclaimed rubber, it is recommended to choose ultra-fine filtered black latex reclaimed rubber with high glue content, which has high strength, good elasticity, small specific gravity, ultra-fine and no impurities; Reasonably determine the mixing ratio of latex reclaimed rubber, and appropriately adjust the formula, especially the vulcanization system and the reinforcing filling system; Properly optimize the production process conditions, and reduce more costs on the premise of ensuring the performance of wire and cable sheath layer and insulation layer.
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