JPH02135308A - Tensile wire made of fiber reinforced synthetic resin for optical fiber cable - Google Patents

Abstract

PURPOSE:To allow identification even when the tensile wire is exposed to a high temp. over a log period of time by forming a colored coated film layer consisting of a UV curing resin contg. a specific ratio of a pigment component on the outer periphery of a wire-shaped FRP material formed by impregnating the curable resin in reinforcing fibers and curing the resin. CONSTITUTION:The colored coated film layer consisting of the UV curing resin contg. >=15wt.% pigment component is formed on the outer periphery of the wire-shaped material of the fiber reinforced plastic (FRP) formed by impregnating an unsatd. polyester resin in the fiber material for reinforcement consisting of long glass fibers and curing the resin and is immediately cured by a UV irradiation device. The hiding power of the coated film is deteriorated and the discoloration transmits the wire-shaped FRP material after lapse of the high temp. by which the wire-shaped material is discolored as a whole if the content of the pigment component is below 15wt.%. The tensile wire for OPGW which allows the identification of the formed color even after long- time exposure to the high temp. is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fiber-reinforced synthetic resin tensile strength wire used in optical fiber cables.

(Prior art and its problems) In recent years, so-called 0P, in which an optical fiber is inserted into the overhead ground wire, has been developed.
Optical fiber cables for GW use tensile strength wires made of fiber-reinforced synthetic resin (hereinafter referred to as FRP) from the viewpoint of non-inductive properties.

Some of these tensile strength wires are placed in the center, and others are used along the outer periphery of the central tensile strength wire along the optical fiber core.

By the way, this type of optical fiber cable usually has multiple optical fibers bundled together, so the optical fiber cores are colored to make them easier to identify when connecting. It is also necessary to color-code the tensile strength wires that are attached to the optical fiber cores in order to clearly distinguish between them and the optical fiber core wires.

However, in order to color different FRP products, it has been known to add toner as a coloring agent to matrix resin, such as unsaturated polyester resin, which is usually impregnated into reinforcing fibers and cured. FR of
There was a problem explained below in the connection applied to the tensile strength wire made of P.

In other words, it is said that 0PGW is exposed to extremely high temperatures when electricity is turned on or when struck by lightning, and the temperature is usually around 150°C for a long time, so even after 400 hours at 150°C,
The condition is that there is little discoloration or fading and that identification is possible, but when coloring is done by adding toner to the matrix resin as mentioned above, the matrix resin itself changes color due to heat, and the color is significantly different from the original color. , making it difficult to identify.

Therefore, the inventors of the present invention have conducted intensive studies on coloring FRP tensile strength wires for identification, which can overcome the above-mentioned problems, and have completed the present invention. The purpose of the present invention is to provide a tensile strength wire made of FRP that can be identified even if

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a fiber-reinforced synthetic resin tensile strength wire attached to an optical fiber cable. It is characterized in that a colored coating layer made of an ultraviolet curable resin containing 15% by weight or more of a pigment component is formed around the outer periphery of the object.

The reinforcing fibers and curable resin that can be used in the present invention must themselves have a heat resistance of 150°C or higher. Glass fibers, aromatic polyamide fibers, etc. are commonly used as reinforcing fibers, but ceramic Non-conductive materials such as fibers can also be used. In addition, as the curable resin, unsaturated polyester resin is used.

Examples include thermosetting resins such as epoxy resins and phenolic resins, and ultraviolet curable resins.

The ultraviolet curable resin that forms the colored coating layer includes a polymer, a crosslinking component, a photopolymerization initiator, and a low boiling point solvent, all of which have good wettability with blue pigments.

It is an ultraviolet curable mixture of various additives and pigments, and after curing and drying, the pigment component in the coating film must contain 15% by weight or more, depending on the thickness of the coating film.

If the content of the pigment component is less than 15 mm%, the hiding power of the coating film will be poor, and the color of the FRP linear material will be transmitted through the discoloration of the FRP linear material after high temperatures have passed, resulting in discoloration as a whole.

Moreover, when the pigment component is 50 mm% or more, the adhesion to FRP becomes poor.

The polymers include urethane-modified, epoxy-modified,
Acrylates such as butadiene-modified are common. The crosslinking component may be anything that has a vinyl group that can be crosslinked by radical polymerization, cationic polymerization, thiol/ene addition polymerization, etc., but radical polymerization type acrylate type modified with acrylic acid or methacrylic acid is generally used. It is true.

In addition, the thickness of the blue coating layer is FRP with an outer diameter of about 0.4 mm.
In the case of 1. A range of 0 to 5.0 is preferable, and 1.0
If the color is less than 10.0, some blue colors may pass through the discoloration of the FRP and the distinguishability may be lost, and if the color exceeds 10.0, the resin will drip during the manufacturing process and the shape will be defective.

(Example) The present invention will be explained in detail below using examples.

Example 1 According to the method described in JP-A No. 62-90229, which has already been filed by the present applicant, unsaturated FRP linear material A with an outer diameter of 0°4 mm and a volume content of 60% glass fiber impregnated and cured with polyester resin is mixed with 5% by weight of blue pigment and 20% by weight of ultraviolet curing resin.96 A UV curing resin (Dainippon Ink & Chemicals Co., Ltd.
The sample was passed through an impregnating tank 1 shown in FIG. 1 filled with Daicure Coat 803) manufactured by Co., Ltd.

The diameter of the inlet part 2 of the impregnating tank 1 was 0.52 mm, and the diameter of the outlet part 3 was changed from 0.44 mm to 0.51 mm, and the outer periphery of the FRP linear material A was coated with resin, and then immediately The ultraviolet curing resin was cured using an ultraviolet irradiation device (manufactured by Oak Seisakusho, ultraviolet irradiation energy: 200 mJ/+4).

The coating film of the obtained linear object has a pigment component in the coating film of 20 mm% due to the volatilization of the solvent, and a thickness of the coating film of 1.2 II.
2゜6J1 from In! It was n.

N011 to N0 shown in Table 1 obtained in the above example
．． Regarding the sample No. 5, the discoloration and fading of the colored blue before and after being left in a dry heat dryer at 150° C. for 400 hours was evaluated.

The samples after being left for 400 hours were darker blue than the initial samples, but were sufficiently distinguishable.

Example 2゜In Example 1, the diameter of the outlet part 3 of the impregnation tank was changed to 0646 m+
Using an ultraviolet curable resin having the same composition as in Example 1 containing blue-green, yellow, red, and purple pigments as s, FRP linear objects having colored coatings of each color were produced as described above. (No, 6 to No, 10).

The thickness of these coatings is 1.3 to 2.3 mm as shown in Table 2.
It was IJm.

The discoloration of each sample after 400 hours at 150° C. had a tendency to darken, but was sufficiently distinguishable.

In addition, natural color without colored coating is 15
After 400 hours at 0°C, the color changed to brown, and it is thought that the polyester resin changed in quality and changed color.

Comparative Example 1 In Example 1, the diameter of the outlet part 3 of the ultraviolet curable resin impregnation bath was set to 0.42 mm and 0.43 m+s, and the coating film thickness was set to 0.4 stage (No. 11) and 0.4 stage (No. 11). 7. cs (
No.

12) was prepared using the same method.

The obtained sample turned dark green after 400 hours at 150°C, and it was difficult to identify it as blue.

This is thought to be due to the discoloration due to mixing, since the coating film is thin and has poor hiding power, and the polyester resin, which has turned brown due to high temperatures, is visible through it.

(Margin below) Table 1 Table 2 (Effects of the invention) As explained in detail in the examples above, the FRP tensile strength wire for optical fiber cables according to the present invention does not discolor even if exposed to high temperatures for a long time. It is now possible to classify the color by age, 0PGW
It can be fully used as a tensile strength wire.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a coating apparatus for a colored coating film for obtaining a tensile strength line according to the present invention. 1... Impregnation If! 12... Entrance section
3...Exit part A...FRP linear object

Claims (2)

[Claims] (1) In a fiber-reinforced synthetic resin tensile strength wire attached to an optical fiber cable, an ultraviolet curable resin containing 15% by weight or more of a pigment component is placed on the outer periphery of an FRP linear object made of reinforcing fibers and a curable resin. 1. A fiber-reinforced synthetic resin tensile strength wire for optical fiber cables, characterized in that it has a colored coating layer formed thereon. (2) The fiber-reinforced synthetic resin tensile strength wire for optical fiber cables according to claim 1, wherein the colored coating layer has a thickness of 1.0 to 5.0 μm.