Water-blocking powder for waterproof cable, preparation method of water-blocking powder and waterproof cable

Abstract

The invention relates to the field of cable processing, and particularly discloses water-blocking powder for a waterproof cable, a preparation method of the water-blocking powder and the waterproof cable. The water-blocking powder for the waterproof cable is prepared from the following raw materials in parts by weight: 80-130 parts of acrylic acid, 20-40 parts of lignosulfonate, 10-30 parts of urea, 10-20 parts of kaolin, 1-2 parts of an initiator and 0.3-0.7 part of a cross-linking agent. The preparation method comprises the following steps: carrying out neutralization treatment on acrylic acid, carrying out initiation treatment on acrylic acid, lignosulfonate and urea through an initiator, adding kaolin and a cross-linking agent, carrying out an ultrasonic reaction, and after the reaction is finished, carrying out dehydration, drying and crushing to prepare the water-blocking powder. The waterproof layer of the waterproof cable uses the water-blocking powder, so that a relatively good water-blocking effect can be achieved in a salt solution.

Description

Technical field [0001] The present application relates to the field of cable processing, and more specifically, it involves waterproof powder for waterproof cables and preparation methods and waterproof cables. Background technique [0002] Waterproof cables are collectively referred to as a class of cables that can be used in water, often in water or moisture. At present, my country's most commonly used cable is a crosslinked polyethylene insulated power cable (hereinafter referred to as XLPE cable), the production process of XLPE cable is simple, the mechanical physical properties are excellent, but it is prone to water tree aging, that is, the moisture invasion XLPE cable, and in XLPE The insulating layer of the cable produces a water tree branch. When the water tree branch reaches a certain degree, it transforms into electric tree branches. The electric tree branches have caused damage to the insulating layer under the influence of the operating voltage, shorten the life of X...

AI Technical Summary

Problems solved by technology

[0005] In related technologies, polyacrylic acid resin is selected as the water-blocking powder. Polyacrylic resin has good water absorption, but its salt resistance is poor

When XLPE cables are used in environments with high salt solution concentrations such as offshore equipment or salt chemical plants, such as polyacrylic resin soaked in seawater (salinity is 35‰), the water absorption of polyacrylic resin is only 100mL / g, the expansion height only reaches 1.6mm / 3min, the polyacrylic acid type resin cannot play a good swelling and blocking effect, the water seepage length of the prepared waterproof cable is as high as 20.9cm, and the waterproof performance of the waterproof cable in the saline solution is not good. good

Images