JPH01130413A - termite proof cable - Google Patents

Abstract

PURPOSE:To obtain a good ant-protective effect by extruding to mould a sheath using compound pellets having organic phosphorous ant-protective agent applied on the surface or absorbed inside. CONSTITUTION:Ant-protective agent of organic phosphorous compound is applied on the surface of compound pellets or absorbed inside them. Though there is no particular restriction for the organic phosphorous ant-protective agent, tetrachloro, pyrida, etc., are especially suitable for wires and cables which require a long service life. For the compound to be moulded into a sheath, vinyl or polyethylene or the like are suitable which are often used for the sheath or wires or cables, though these are not the only example. Around a core wire 1 coated with insulation 2 is moulded a sheath 3 by extrusion using compound pellets having organic phosphoric ant-protective agent absorbed inside, for example, so an ant-protective cable is formed. The ant-protective cable is thus formed restricting thermal hysteresis of the ant-protective agent to the minimum decomposition, thereby reduction of ant-protective effect is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electric wires and cables, and more particularly to termite-proof electric wires and cables.

[Conventional technology] Electric wires and cables installed and used in areas where termites inhabit suffer extensive damage, and power supply, communication, and information transmission are often disrupted. It has been announced not only in this country but also in many other countries.

Conventionally, many organic Inn chemical compounds such as aldrin and dieldrin have been used as termite control agents or exterminators, so-called termiticides, and have achieved many effects.

However, on the other hand, these organic I′i! Ij is difficult to use as a base anti-termiticide, has strong persistence and accumulation, and is prone to bioaccumulation.
Due to environmental health issues such as environmental pollution and pollution, woodtees have been designated as specialized products and measures have been taken to prohibit their production, manufacture, or use.

The prohibition of the use of termiticides, which are extremely cheap, easy to handle, and exhibit effective termitproofing properties, has caused problems in many areas.

Electric wires and cables are no exception to this, and are susceptible to termite growth, e.g.
In order to fulfill important roles such as power supply and information transmission in the region, it is necessary to take at least some kind of ant control treatment.

One of the countermeasures for electric wires and cables is to use rigid and hard plastics to prevent termite attack through physical effects, such as nylon, high-density polyethylene, polypropylene, epoxy resin, etc.・Because there are so many problems in the manufacturing of cables, and because they are made of hard materials, wires and cables that have important uses such as flexibility and bending often have problems, and they are not necessarily perfect. Not yet.

Vinyl and polyethylene are economical, productive, and easy to handle as sheaths and anticorrosion layers for electric wires and cables.

It is widely used due to its ease of installation, electrical, physical, and chemical characteristics. If these vinyl, polyethylene, etc. are used by adding a termite-proofing agent, the benefits will be enormous.

For this reason, many chemical substances have been proposed even now, but the current situation is that not many are effective.

Recently, organic phosphorus compounds have been attracting attention as they have an effective termite control effect, are easy to decompose, have extremely low residual and accumulation properties, and have very low pollution potential for the natural environment and the human body. It has been used as an agent.

[Problems to be solved by the invention] There are many problems with rigid plastics such as nylon and high-density polyethylene, including manufacturability, handling, flexibility, bendability, and economic efficiency, and they cannot be used in all applications. It is difficult to apply.

Many additive-type anti-termite agents for plastics, rubber, etc. are questionable in terms of their anti-termite properties, and those that are effective are not legally prohibited due to structural reasons. There are many cases where the properties are very close to prohibited substances and are therefore problematic.

Organophosphorus compounds have been used as pesticides for some time, and it has been confirmed that they have great control and extermination effects against termites. It is also said that it is easy to decompose and causes little pollution to the human body and the environment. For residential purposes, etc., some of them have recently been put into practical use from this point of view. The problem with this organophosphorus compound is that it is too easy to decompose and has a short duration of effect and useful life. This decomposition is particularly rapid due to factors such as ultraviolet light and heat. Naturally, this decomposition leads to the loss of termite prevention effect.

An object of the present invention is to provide a novel termite-proof cable that eliminates the drawbacks of the prior art and exhibits excellent termite-proofing effects.

[Means and effects for solving the problem] The present invention uses an organophosphorus compound, which is a termiticide, as a compound.
This is an anti-termite cable that minimizes thermal history and suppresses decomposition by attaching it to the surface of the product or absorbing it inside the product, thereby significantly preventing the deterioration of the anti-termite effect.

[Example] There are no particular restrictions on the organophosphorus termiticide of the present invention, and for products that require long life such as electric wires and cables, tetrachlorobinphos and pyritafene are used. Onfoxime, chlorpyrifos, fentrothion, prothiophos and the like are particularly preferred.

As for the compound to be molded into the sheath, vinyl or polyethylene, which are often used as sheaths for electric wires and cables, are suitable, but there is no particular limitation to these, and thermoplastic elastomers, other plastics, and rubber are also suitable. Can be used.

The method of attaching these compound pellets to the surface is to apply a lot of plasticizers or highly adhesive polyisobutylene to the surface of the pellet if it is made of vinyl, then add an organophosphorus termiticide to this and spread it evenly over the pellet surface. Make it adhere. Even if polyethylene is used, a termiticide can be applied in the same way using polyisobutylene, borifthene, etc. as an adhesive.

When absorbing, the termiticide is mixed with a liquid material of a suitable plasticizer, the liquid material is first applied to the pellet, and the material is heated and absorbed into the pellet.

In addition, most organophosphorus termiticides have melting points below 100°C, so they can be directly attached to vinyl or polyethylene pellets, heated to below the melting point, and then absorbed into the compound pellets. . Also,
Is the amount of termiticide appropriate depending on the purpose? The most appropriate range is 0.2 parts by weight to 5 parts by weight based on the compound lOO heavy abrasive part, and if it is less than this, the termiticide effect is Anything more than this is not preferable because it would have a negative effect on economic efficiency and general characteristics, even if the effect is parallel.

In this invention, as shown in FIG. 1, a sheath 3 is extruded around a core wire 1 covered with an insulator 2 using compound pellets in which an organophosphorus termiticide is absorbed. It is formed from a dovetail cable. In addition, Fig. 2 shows a three-strand insulated core wire coated with an insulator 2 through an intervening material 4, and a compound pellet in which an organophosphorus termiticide is absorbed into the core wire 1-. It is formed by extrusion molding the termite-proof sheath 3. Furthermore, Figure 3 shows that 3
An organophosphorus termiticide is attached to the surface of the cable, in which a sheath 5 is formed via a twisted insulating core wire 4, to form a termite-proof sheath 3.

Next, Examples and Comparative Examples of the organophosphorus termiticide sheath of the present invention will be shown.

Actually, 1 case.

tension:, sp = 1300 (7) Polyvinyl chloride (PvC) resin to off The mixture was kneaded and formed into a pellet. The surface of this pellet was sprinkled with 3 tons of 1 ¥ part of tetrachlorobin phos, and the temperature was increased to 95%, which is the melting point of this termiticide.
It was left at a temperature of 110'C higher than 110°C for 2 hours to allow the termiticide to be absorbed into the interior.

Ethylene-vinyl acetate copolymer tooB with a tip density of 0.93
+, 41 parts of polyisobutylene was adhered to the surface of the H part in double layers, and tetrachlororobinphos, a termiticide, was adhered to the double layers on the surface of the H part.

Two parts of tetrachlorobinphos were added to 100 tons IQ) of the composition of Example 1, and the mixture was kneaded at 180° C. for 5 minutes to form pellets.

As a result of extracting and analyzing the termiticide from the compounds of Example 1.2 and Comparative Example 1 using a solvent, it was found that the decomposition rate of the termiticide in Example 1 was almost ignored because it was heated at 110°C for 2 hours. It was confirmed that almost 100% of the material remained.

Since Example 2 was not heated at all, it was not 100% decomposed.

On the other hand, Comparative Example 1 was subjected to compound pellet molding conditions at a temperature of 180°C for 5 minutes, so the percentage was 17.2%.
It was confirmed that the decomposition rate was 100%, and that it was reliably decomposed by heating.

[Effects of the Invention] As explained hereafter, in this invention, an ant-proof cable is manufactured by extrusion molding a sheath using compound pellets in which an organophosphorus termiticide is attached to the surface or absorbed inside. can be formed with the thermal history of the termiticide suppressed to a minimum of decomposition, thereby significantly preventing the deterioration of the termiticide effect.

[Brief explanation of the drawing]

1, 2 and 53 are cross-sectional views showing embodiments of the termite-proof cable of the present invention. 1...Core wire 2...Insulator' 3...Anti-termite sheath 4...Intervention 5...Sheath special issuer 11 Keden Wire Co., Ltd.

Claims (1)

[Claims] An anti-termite cable characterized by extrusion molding into a sheath using compound pellets with an organophosphorus termiticide coated on the surface or absorbed inside.