Acid, alkali, and salt corrosion resistant soft polychloroethylene cable sheath material and corrosion-resistant cable

Abstract

The invention relates to a flexible polyvinyl chloride granula for cable with resistance to highly corrosive mediums comprised of acids, alkaline, saline, etc. The components of the invention: 100 shares of polyvinyl chloride resin, 10-30 shares of Polyethylene vinyl acetate or Di-octyl terephthalate and / or Dinonyl phthalate, 6-20 shares of dioctyl sebacate, 5-20 shares of dioctyl phthalate, 8-20 shares of chlorcosane with 52 percent chloride content, 0.3-1.5 shares of paraffin, 4-10 shares of stabilizing agent. Owing to the adapting of the insoluble or slightly dissolving in water, acid or alkali alkaline hydrolysis mixing plasticiser, the hydrolysis and extraction of the plasticiser are effectively prevented; the moisture content is decreased without adding hygroscopicity plugging compound; adding paraffin, the paraffin is dissolved out after the cooling, and then the waterproof membrane is formed at the surface of the plastic and the immergence of the moisture is prevented. The suction of the outside aqueous solution is decreased or avioded, the hydrolysis and extraction with plasticiser are decreased and avioded, and the acid resistance, the alkali resistance and the salt resistance are acheived, the service life in the saline and alkaline areas and coastal areas is prolonged. The invention can be led underground in saline and alkaline areas (inland) and coastal areas (tideland) and the safe service life can be prolonged one time to six times.

Description

technical field [0001] The invention is an improvement to the plastic cable sheathing material, in particular to a soft polyvinyl chloride cable sheathing material and a corrosion-resistant cable which can withstand strong corrosive media such as acid, alkali and salt. Background technique [0002] Soft polyvinyl chloride plastic (soft PVC plastic for short) is the most widely used sheath material in the cable industry. This type of plastic is composed of polyvinyl chloride resin with plasticizers, fillers and other additives. Among them, the amount of plasticizer and filler is relatively large, which are the first and second added components except resin, such as: [0003] Chinese patent CN1341681 discloses soft polyvinyl chloride plastics for wires and cables, weight ratio: 100 parts of polyvinyl chloride; 30-90 parts of main plasticizer; 3-10 parts of calcium-zinc composite stabilizer; 2 parts of auxiliary plasticizer ~15 parts; 5~50 parts of filler. [0004] Chinese pa...

AI Technical Summary

Problems solved by technology

The weight increase percentage of water absorption of inorganic fillers reaches 0.15-0.80%. Water absorption will cause the electrical insulation performance of plastics to decrease by 10-100 times, thus making the sheath lose its use value

[0012] The second is that soft PVC plastic absorbs water, causing the plasticizer to undergo acidic hydrolysis under the erosion of acid, alkali, and salt (the average salt content (Nacl) in saline-alkali areas is 1.5%, and the salt content in seawater in coastal soil is 3.34%). Or alkaline hydrolysis and extraction, so that the insulating oil-soluble substances are converted into water-soluble substances, causing the insulation performance to decrease, and the plastic becomes hard and brittle, so that the cable loses its usability

[0024] The above-mentioned methods of improving the corrosion resistance of cables all adopt the method of external coating, which does not involve the modification of the material itself to improve the corrosion resistance of the material, and the addition of a corrosion-resistant coating, first, increases the process and cost, and second, the coating and Matrix-to-matrix bonding is always less than ideal

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