JP4921804B2 - Waterproof tape for cable - Google Patents

Description

  The present invention relates to a water stop tape for preventing running water in a cable.

  The waterproofing tape for cables is composed mainly of synthetic resin and synthetic rubber that do not corrode microorganisms, and water-absorbing resin powder. Depending on the purpose, additives such as anti-aging agents, carbon, surfactants, and rust inhibitors are used. It is blended (see Patent Document 1).

  Although the water-absorbent resin powder blended in these water-stopping tapes is not sticky at all in a dry state, it has a property of absorbing moisture immediately when exposed to a high humidity environment such as rainy weather. .

  These waterproof tapes absorb moisture and become sticky when used in a high humidity environment such as rainy weather, so when taping on a cable, stick to the taping device's guide. There is a problem that the conductive resin composition layer is taken and accumulated, and the self-back surface of the tape is blocked and the development becomes heavy. Dirty guides and the like need to be cleaned frequently, and in some cases, the accumulated dirt on the guides may drop off and enter the cable.

  In order to solve these problems, a type in which an anti-sticking layer is provided on the water absorbent resin composition layer (see Patent Document 2), or a low-weight nonwoven fabric made of synthetic fibers is applied on the water absorbent resin composition layer. A combined sandwich type (see Patent Document 3) has been proposed.

  However, in the sandwich type in which the low-weight nonwoven fabric is bonded, the water-absorbent resin composition layer partially leaks from the gap between the low-weight nonwoven fabrics, and it has not been possible to completely eliminate the dirt such as the guide. Furthermore, the low-weight nonwoven fabric has nothing to do with the original purpose of water stoppage, and has been a factor in increasing costs.

In addition, the type in which the anti-sticking layer is provided on the water-absorbing resin composition layer has a non-sticking layer that is unrelated to the original water-stopping purpose and is overcoated on the water-absorbing resin composition layer. This was a factor in increasing costs, including an increase in the number of painting processes when manufacturing water tape.
Japanese Utility Model Publication No. 61-129228 Japanese Patent No. 2832355 Japanese Patent No. 3055808

  The present invention eliminates cost increase factors such as providing a non-sticking layer and a low-weight non-woven fabric layer on a water-absorbent resin composition layer in a waterproofing tape for cables, and is capable of producing cables even in a high humidity environment such as rainy weather. It is an object of the present invention to provide an inexpensive waterproofing tape for cables that does not contaminate the taping device guide of the present invention, does not block, and is excellent in waterproofing performance.

The present invention has been completed by paying attention to the fact that, in the waterproofing tape for cables, if the adhesiveness of the water-absorbent resin composition layer itself can be significantly reduced, no anti-sticking layer or low-weight nonwoven fabric layer is required. Thus, a silicone compound (hereinafter referred to as “dimethylpolysiloxane”) or a fluorine compound (hereinafter referred to as “perfluoroalkyl group / lipophilic group-containing oligomer”) is internally added to the water absorbent resin composition itself. In addition, the adhesiveness of the water-stopping tape, which is a cause of dirt such as a taping device guide for cable manufacture, is greatly reduced, and blocking of the back surface of the tape during moisture absorption is prevented.

  Specifically, in a water-stopping tape in which a water-absorbent resin composition is applied to one side of a substrate, hydrogen gas is generated by decomposition of heat treatment or corrosion by microorganisms for 100 parts by weight of the dried water-absorbent resin composition. 0.05 to 20 parts by weight of one or more silicone compounds or fluorine compounds to be added is added.

A sheath peelability-imparting resin composition may be applied to the opposite surface of the substrate .

  The waterproofing tape for cables of the present invention has the following effects.

(1) Even if the water-stopping tape absorbs moisture in a high-humidity environment such as rainy weather, the water-stopping tape will not become sticky, so the guide etc. will be soiled during the water-stopping tape manufacturing process and cable taping process. There is nothing. In addition, there is no blocking of the back surface of the tape. As a result, it is not necessary to stop the machine and clean the guides and the like, and it is possible to achieve a significant increase in productivity and a reduction in cable defects.

(2) Significant cost reduction can be realized as compared with a type in which an anti-sticking layer is provided on the water absorbent resin composition layer or a type in which a low-weight nonwoven fabric is bonded.

(3) Since it becomes difficult to shift to the grooved spacer of the optical fiber cable, the speed of the cable manufacturing line can be increased, and the productivity of the cable can be greatly improved.

(4) Since the constituent material is made of 100% synthetic product, it is difficult to be decomposed by microorganisms and does not generate hydrogen gas that is harmful to optical fibers even when heated. Since the viscosity of the resin does not decrease, it has long-term reliability over several decades.

(5) As a waterproof tape for optical fiber cables, it has excellent handleability and waterproof performance.

  As a base material used for this invention, it has the intensity | strength which can endure the taping tension | tensile_strength at the time of an application | coating process or cable manufacture, and is a thing which is not decomposed | disassembled by microorganisms and has a flexibility. Therefore, synthetic fiber nonwoven fabrics such as polypropylene, nylon, polyester, and acrylic, synthetic films, and composites thereof can be suitably used.

The water-absorbing resin composition used in the present invention contains a water-absorbing resin powder and a synthetic rubber or a binder made of synthetic resin as essential components, and if necessary, a wetting agent, an anti-aging agent, an organic solvent, and the like. These are obtained by internally adding 0.05 to 20 parts by weight of a silicone compound or a fluorine compound with respect to 100 parts by weight of the dried composition. These are preferably those that do not generate hydrogen gas by microbial corrosion or heat treatment. If the water-absorbing resin composition layer is attached in an amount of 10 to 100 g / m ^{2 in} terms of the amount of water-absorbing resin powder, a sufficient water-stopping effect can be obtained.

  The water-absorbing resin powder is a 100% synthetic product having a water absorption capacity several tens to several thousand times its own weight and having no microbial corrosive properties. For example, acrylate-based cross-linked products, vinyl acetate / acrylic acid ester copolymer saponified products, polyvinyl alcohol / maleic acid copolymer cross-linked products, acrylate / acrylamide copolymers, and polyethylene oxide modified products are suitable. These may be used alone or in combination of two or more. As a compounding quantity of a water absorbing resin, 50-2000 weight part is suitable with respect to 100 weight part of binders. This is because if the amount is less than 50 parts by weight, the water-stopping effect is not exhibited, and if it exceeds 2000 parts by weight, processing becomes difficult.

  The binder made of synthetic rubber or synthetic resin used in the present invention has a water-absorbing resin when the water-absorbing resin powder is fixed to a substrate and the water-stopping tape is cut to a practical width or when the water-stopping tape is wound around a cable. It has a function of preventing the powder from falling off the base material, and is a 100% synthetic product having no microbial corrosiveness. Synthetic rubbers or synthetic resins include polyisobutylene, butyl rubber, acrylic rubber, ethylene / propylene rubber, acrylic resins, polyurethane resins, polyester resins, ethylene copolymers, polyamide resins, etc. that do not contain halogen atoms Is preferred.

  As the anti-adhesive agent used in the present invention, silicone compounds and fluorine compounds can be used. In the case of optical fiber cable applications, the generation of hydrogen gas becomes a problem. As silicone compounds, silicone oils such as dimethylpolysiloxane that do not have a reactive group in structure and dimethylpolysiloxane and acrylic resin are structurally stable. These block or graft copolymers are preferred.

  Further, as the fluorine compound, it is preferable to use a perfluoroalkyl ethylene oxide adduct, a perfluoroalkyl group / lipophilic group-containing oligomer, a block or graft copolymer of a perfluoroalkyl compound and an acrylic resin.

  The internal addition amount of the silicone compound or the fluorine compound is preferably 0.05 to 20 parts by weight with respect to 100 parts by weight of the dried water-absorbent resin composition. This is because it is insufficient, and if it exceeds 20 parts by weight, the cost increases.

  The water-stopping tape of the present invention is obtained by adhering a water-absorbing resin composition layer containing a silicone compound or a fluorine compound internally to one side of a substrate.

  Specifically, take a specified amount of binder, water-absorbent resin powder, silicone compound or fluorine compound, organic solvent, and anti-aging agent, wetting agent, organic solvent, etc. The mixture is stirred and dispersed to obtain an anti-tackifier-added water-absorbing resin composition. The obtained anti-tackifier imparting agent-added water-absorbing resin composition can be obtained by applying and drying on one side of a substrate by a known coating method.

  The water-stopping tape of the present invention has a silicone compound or a fluorine compound added internally to the water-absorbent resin composition, whereby the adhesiveness of the binder made of synthetic rubber or synthetic resin is greatly reduced, and The adhesiveness of the water absorbent resin when the tape absorbs moisture is also greatly reduced. As a result, even under high-humidity conditions such as rainy weather, guides etc. will not get dirty in the waterproof tape manufacturing process or cable manufacturing taping process, and there will be no blocking of the tape's own back surface, which may reduce productivity due to cleaning. There is no contamination of the cable with dirt residue. Furthermore, since there is no stickiness prevention layer or low-weight non-woven fabric layer on the water absorbent resin composition layer, even if water enters the cable from the outside, the water absorbent resin powder quickly swells and absorbs water. Since it fills the gaps in the cable, it gives the cable excellent water stop performance.

  Furthermore, since the silicone compound and the fluorine compound exhibit an effect with a small amount of internal addition, the cost can be greatly reduced as compared with the type in which the anti-sticking layer is provided or the type in which the low-weight nonwoven fabric is bonded.

  The waterproofing tape for cable according to the present invention is effective in preventing the coating film from being transferred to the grooved rod of the optical fiber cable, and can contribute to speeding up the cable production line by increasing the sheath extrusion temperature. It can be applied as a waterproofing tape.

  FIG. 1 is a cross-sectional view showing an example of the structure of a waterproof tape for cable according to the present invention. In this waterproofing tape for cables, a water absorbent resin composition layer 2 in which a silicone compound or a fluorine compound is internally added is laminated on one surface of a synthetic fiber nonwoven fabric 1. A black dot 3 indicates a water-absorbing resin powder, and 4 indicates a binder containing a silicone compound or a fluorine compound. Reference numeral 5 denotes a resin layer for imparting sheath peelability.

100 parts by weight of ethylene / propylene rubber, 300 parts by weight of water absorbent resin powder, 3 parts by weight of anti-aging agent, 1 part by weight of wetting agent, 5 parts by weight of dimethylpolysiloxane (100 parts by weight of dried water absorbent resin composition) and about 1.24 parts by weight) relative to, placed in a stirred vessel 600 parts by weight of toluene, and dissolved with stirring at a stirrer to prepare a dimethylpolysiloxane in添吸aqueous resin composition, the basis weight 50 g / m ² polyester A dry weight of 40 g / m ^{2 is} applied and dried on one side of the long-fiber nonwoven fabric, and further, an acrylic resin solution is applied at a dry weight of 10 g / m ² to give a sheath peelability on the back side, and then cut to a width of 25 mm. Thus, a waterproof tape for an optical fiber cable was obtained.

A water-absorbing resin composition was prepared by replacing the dimethylpolysiloxane of Example 1 with a perfluoroalkyl group / lipophilic group-containing oligomer, coated and dried in the same manner as in Example 1, and then the waterstop tape of Example 2 was cut. Obtained.
[Comparative Example 1]

A water-absorbent resin composition from which dimethylpolysiloxane was removed from Example 1 was prepared, and was cut after coating and drying in the same manner as in Example 1 to obtain a waterproofing tape of Comparative Example 1.
[Comparative Example 2]

  A water-absorbing resin composition was prepared by replacing the dimethylpolysiloxane of Example 1 with a silicone rubber for condensation reaction type release paper having a hydroxyl group, and coated and dried in the same manner as in Example 1 and then cut off. I got a tape.

  Various tests were conducted on the examples and comparative examples.

(1) Hydrogen generation test In order to confirm the presence or absence of hydrogen gas generation in the optical fiber cable waterproof tape, the following methods were used to test the water stop tapes of Examples 1 and 2 and Comparative Examples 1 and 2. went.

A test sample (1 g) was placed in a gas clonal vial having a capacity of 15 cc and sealed with a Teflon (registered trademark) packing to prepare a test sample. Two water-stopping tapes were prepared, 1 cc of the air in the gas chromatography vial was taken out after treatment at 100 ° C. × 3 days and 100 ° C. × 7 days, and the concentration of hydrogen gas was analyzed by gas chromatography. The analysis results are shown in Table 1.

  In the water-stopping tape of Example 1 to which dimethylpolysiloxane was added, Example 2 to which a perfluoroalkyl group / lipophilic group-containing oligomer was added, and Comparative Example 1 to which no silicone compound or fluorine compound was added, Although there was no generation, hydrogen water harmful to the optical fiber was generated in the waterproofing tape of Comparative Example 2 to which the silicone rubber for condensation reaction type release paper having a hydroxyl group was added.

  As a result of the test, it was confirmed that dimethylpolysiloxane and oligomers containing perfluoroalkyl groups / lipophilic groups could be used for water-stopping tapes for optical fiber cables.

(2) Microbial Corrosion Test In order to confirm the microbial corrosivity of the water-proof tape for optical fiber cables, the water-stopping tapes of Examples 1 and 2 and Comparative Example 1 were tested by the following method.

  In a 300 cc Erlenmeyer flask, add 4 g of the test sample, 0.4 g of ammonium dihydrogen phosphate, which acts as an accelerator in the microbial corrosion test, and 200 cc of the soil extract described below, and after mixing, seal with a silicon stopper. Store in the shade at 30 ° C., and periodically remove 1 cc of air from the top of the Erlenmeyer flask until 30 days later, analyze the generated gas with a gas chromatograph, and examine the color and state of the solution with the naked eye. For comparison, the test was performed at the same time using a pulp that is degraded by microorganisms as a test sample.

  The soil extract was prepared as follows.

(A) The soil has fallen leaves and is collected from the waterside where the grass grows.

(B) 500 g of soil is mixed with 2000 cc of pure water and stirred.

(C) After standing for 12 hours, the supernatant is filtered, and 150 cc of pure water is added to 50 cc of the filtrate to obtain a soil extract.

  As a result of the test, in the sample using pulp as a test sample, generation of hydrogen gas, which is an index of the corrosive action by microorganisms, was remarkable, and further generation of mold was observed. On the other hand, in the samples using the water-stopping tapes of Examples 1 and 2 and Comparative Example 1 as test samples, there was no change such as generation of hydrogen gas and generation of mold. From this, it was confirmed that the waterproof tape for optical fiber cable of the present invention did not generate harmful hydrogen gas to the optical fiber and had excellent microbial corrosivity.

(3) Rewinding test In order to confirm the guide stain prevention effect and the blocking prevention effect of the cable waterproofing tape of the present invention, the tape rewinding device shown in FIG. A guide smear test by continuous rewinding and a check for blocking of the tape back surface were carried out.

6 is unwinding, 7 is winding, 8 is an MC nylon guide, 9 is a SUS guide, and 10 is a chrome-plated guide. In order to confirm the influence of humidity, the moisture absorption rate of the water-stopping tape was tested at two levels adjusted to 2% and 15%, and the maximum length was rewound to 20000 m. The results are shown in Table 2. The numerical value is the number of rewinds that began to become dirty.

  As a result of the test, it was confirmed that there was no dirt on the guide and no blocking of the back surface of the tape in the example of the present invention.

(4) Simulated water stop test In order to confirm the water stop effect of the water stop tape, the following simulation test was conducted.

  Optical fiber tape core wire (thickness 0.4 mm x width) in 5 grooves of 30 m long 100-fiber optical fiber cable spacer (number of grooves: 5 grooves groove dimensions: width 1.6 mm x depth 2.5 mm) 1. 1 mm) is inserted 5 times each, the water-absorbing resin composition layer of the 25 mm wide optical fiber cable waterproof tape is placed inside, and is wrapped horizontally with a wrap width of 5 mm. A polyester adhesive tape was wound around to prepare a test sample. A water injection port was attached to one terminal, and artificial seawater was injected at a water head pressure of 1 m. The water stop tape of Example 1 stopped at 12.4 m, and the water stop tape of Example 2 stopped at 12.5 m. Moreover, the water stop tape of the comparative example 1 stopped at 12.7 m. The results were almost the same, and it was confirmed that the water-stopping performance was not affected by silicone compounds or fluorine compounds.

It is sectional drawing which shows an example of the waterproofing tape for cables of this invention. It is the schematic which shows a tape rewinding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Synthetic fiber nonwoven fabric 2 Adhesion prevention imparting agent internal water-absorbing resin composition 3 Binder containing silicone compound and fluorine compound 4 Water-absorbing resin powder 5 Sheath peelability imparting resin composition 6 Unwinding 7 Winding 8 Made of MC nylon Guide 9 SUS guide 10 Chrome-plated guide

Claims (2)

Dimethylpolysiloxane or perfluoroalkyl , which is coated with a water-absorbent resin composition on one side of a substrate, and does not generate hydrogen gas due to decomposition by heat treatment or corrosion by microorganisms with respect to 100 parts by weight of the dried water-absorbent resin composition A water-stopping tape for an optical fiber cable, wherein 0.05 to 20 parts by weight of a base / lipophilic group-containing oligomer is internally added. The waterproofing tape for optical fiber cables according to claim 1 , wherein a sheath peelability-imparting resin composition is applied to the opposite surface of the substrate.

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