Expansion water blocking tape for optical cable

Abstract

This invention relates to a single-layer expansion water bag used in optical cables. The base material is adhesive-bonded cloth provided by a roll to be soaked in a preformed solution then to be cross linked at site in a reaction drying channel to get the expansion water bag, among which, composition of the preformed solution (in weight portion) is: acrylic acid 40-60, NaoH20-40, acrylamide 3, ethyl 2-methacrylate 3, potassium peroxydisulfate 0.1-0.2, water: 130, crosslinker 0.1 and surface active agent 0.2. The invented preformed solution includes multiple acrylic acid monomers and various aids to ensure that it has rather high water absorption rate to meet the needs of absorption of water bags, the active aids is to make polymers to have enough surface area to reach the absorption rate.

Description

Technical field: [0001] The invention relates to a water-blocking material, in particular to a single-layer expansion water-blocking tape for an optical cable. Background technique: [0002] In communication optics and cables, the mechanical pressure during laying or maintenance sometimes causes the entry of water and moisture. If water and moisture invade the interior of the optical cable or corrode the metal and optical fibers in the junction box, it will cause hydrogen loss, disconnection, and electrical failure. The sharp drop of insulation performance and affect the signal transmission of optical cable. [0003] In order to solve the above problems, ensure the safe operation of the optical cable and prolong the service life, the following methods are usually used to prevent moisture. [0004] (1) Fill the inside of the optical cable with thixotropic ointment, including hydrophobic (hydrophobic) type, water-expandable type, and thermally-expandable type. These material...

AI Technical Summary

Problems solved by technology

These materials are all oily materials, with a large amount of filling, high cost, easy to pollute the environment, difficult to clean, and the weight of the optical cable is too heavy

[0005] (2) Hot-melt adhesive water blocking ring is used between the inner and outer sheaths. This method has low efficiency and complicated process, and only a few manufacturers can realize it.

[0012] At present, most domestic manufacturers of water-blocking belts use imported superabsorbent resins. This kind of superabsorbent polymers is expensive, which increases the cost of the product. Moreover, if the resin is not well preserved, it is easy to absorb moisture and agglomerate, and make the The powder spraying of the distributor is blocked, which brings great inconvenience to the production

When the adhesive is sprayed, it may be stained with some impurities, which will bring hidden dangers to the stability of the optical cable in the future

In addition, due to the uneven distribution of the adhesive, some water-absorbent resin powder is easy to fly out due to poor adhesion to the non-woven fabric when the optical cable factory uses wrapping or longitudinal wrapping to process the optical cable, which not only weakens the water-blocking function of the water-blocking tape, but also deteriorates it. The working environment, such as inhalation in the mouth, will bring hidden dangers to the health of workers