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Introduction of rubber electrical insulation properties of conveyor belt

Mar 29, 2019

Generally, in the electric insulating rubber formula, the amount of the filler is relatively large, so the influence on the electrical insulation of the vulcanized rubber is large, and the carbon black, especially the carbon black having a high structure and a large specific surface area, is easy to form a conductive passage when the amount is large. Electrical insulation is significantly reduced;

Insulating rubber conveyor belt products commonly used in inorganic fillers, high-voltage electrical insulation rubber can choose calcium carbonate, water-sliding and water content, because water absorption reduces the hydrophilicity of the filler surface, so in the electrical insulation rubber, in addition to As a coloring agent, generally not used fillers: clay, talcum powder, mica powder, calcium carbonate and white carbon black rubber can use talc powder, calcined clay and surface modified clay, low-pressure calcium carbide powder and ordinary clay, use filler Attention should be paid to the fact that the filler of the filler and the filler of the water content reduce the electrical insulation of the vulcanizate. In order to prevent the inorganic filler such as clay and silica from being modified with a fatty acid or a silane coupling agent, Reduced electrical insulation;

The particle shape of the filler has a great influence on the electrical insulation properties, especially the breakdown voltage strength, because the flaky filler can form an obstacle to prevent breakdown in the insulating rubber, so that the breakdown route cannot be straight, so the flaky mica powder The breakdown voltage strength is higher, and the amount of filler is increased, which can improve the breakdown voltage strength of the product, and the reasonable filler dosage should be comprehensively considered according to various electrical performance indexes and physical performance indexes;

The low-voltage electrical insulating rubber based on the rubber used in industrial conveyor belts is usually selected from paraffinic hydrocarbon oils to meet the requirements. When manufacturing high-voltage electrical insulating products, it is required that the softener should be heat-resistant and ensure high-voltage electricity. Insulation properties, low viscosity polybutene oligomers and larger molecular weight polyester plasticizers can be used, but polyester compounds can cause hydrolysis when they are vulcanized with direct steam to form low molecular polar compounds. Therefore, the electrical insulating property is lowered, and the naphthenic oil and the high aromatic hydrocarbon oil which are not required for heat resistance are used as the operating oil;

Electrical insulating rubber products, especially high-voltage resistant electrical insulating rubber products, must withstand the effects of high temperature and ozone during use. Therefore, when designing electrical insulating rubber, attention should be paid to selecting a protective system to extend the service life of the product. The use of amines, p-phenylenediamine antioxidants, and the use of appropriate anti-ozonants, can obtain better protection, such as the use of rubber band anti-aging agent, microcrystalline wax, can reduce the formation of cracks, the growth rate of cracks Slowly, it has a protective effect against ozone, and the protective effect is good. When using anti-aging agent, it should be noted that the amine anti-aging agent interferes with peroxide vulcanization, and also pay attention to the water absorption and purity of the anti-aging agent; softener or plasticizer When the molecular structure contains an aromatic group, the anti-radiation ability of the vulcanizate can be improved. The radiation resistance of the aromatic hydrocarbon oil added to the oil-filled polymerization is better than that of the non-oil-filled oil, because the aromatic hydrocarbon oil can reduce the radiation crosslinking speed, and when the aromatic hydrocarbon oil is added The radiant energy is easily absorbed or converted by the rubber macromolecules to the benzene nucleus of the aromatic oil, thereby reducing the radiation effect on the rubber;