Water swelling type water-blocking belt for optical cables and cables and preparation method thereof

Abstract

The invention discloses a water swelling type water-blocking belt. The water-blocking belt includes a matrix layer, a water-absorbing layer and a protective layer; the inner wall of the matrix layer is in contact with the external of an optical cable or a cable; the bottom of the water-absorbing layer is connected to the outer wall of the matrix layer; the protective layer externally wraps the part, other than the junction part of the water-absorbing layer and the matrix layer, on the water-absorbing layer; the bottom of the protective layer covers the junction part of the water-absorbing layer and the matrix layer; the water-absorbing layer contains a superabsorbent expansion material; the protective layer is a thin film which can be dissolved after absorbing water; a bonding layer can bearranged between the matrix layer and the water-absorbing layer; and the matrix layer is preferred to be metal. The water-blocking belt is strong in water absorbing and blocking performance, less inlayer, simple and light in structure, high in water swelling multiple, high in water-absorbing efficiency and good in water blocking performance; influences on the using of the optical cables or the cables cannot be caused; and the water-blocking belt has advantages of shielding signals and preventing rats from biting.

Description

technical field [0001] The invention relates to a water-blocking material, in particular to a water-absorbing-expandable water-blocking tape for an optical cable and a preparation method thereof, which is particularly suitable for enhancing water-absorbing and water-blocking performance, and has fewer layers and a simple structure. Background technique [0002] During the long-term use of the optical cable or cable, moisture and water sometimes enter the optical cable or cable, which may cause great damage to the optical fiber loss characteristics and static fatigue performance. On the one hand, moisture will cause hydrogen damage to the optical fiber, causing cracks in the optical fiber On the other hand, at low temperature, the optical fiber will be broken due to the freezing of water in the cable core, and the corrosion of the metal body in the optical cable or cable by water will damage the life of the optical cable or cable. Therefore, it is important to prevent the pre...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and problems existing in the prior art of poor water absorption and water resistance performance, many layers, and cumbersome structure, and provide an optical cable with better water absorption and water resistance performance, fewer layers, and simple structure Water-absorbing expansion type water-blocking tape for cables and preparation method thereof

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