JPS61162576A - Corrosionproof tape - Google Patents

Abstract

PURPOSE:To obtain the titled tape of high termite exterminating effect with little vaporization and/or decomposition of termite expellant even in calendering operation, useful as joining material for electric wires, by incorporating, as an active ingredient, specific bis-ether in tape material. CONSTITUTION:The objective tape can be obtained by incorporating (A) a rubber or plastic as a tape material with (B) as an active ingredient, a bis (2,3,3,3-tetrachloropropyl)ether of formula.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an anti-corrosion tape having anti-termite properties.

(Background of the Invention) Anticorrosive tape is wrapped around, for example, plastic pipes, electric wires and cables, or their connections and terminals for the purpose of repair, protection, and the like. However, when these are buried underground, termite damage occurs, and for example, in the case of electric wires and cables, electricity and communication may suddenly become unavailable. Therefore, the anti-corrosion tape may also need to have termite-proofing properties, just like the plastic pipes, electric wires, cables, etc. to be buried.

Termite prevention methods for electric wires and cables vary slightly depending on the type of termites, environment, etc., but basically, (a) imparting termite-proofing properties to the electric wires and cables themselves, and (b) electric wires and cables. It can be roughly divided into two types, which provide anti-termite properties around the installation.

In other words, in method (a), the structure and materials of the wires and cables are devised, a layer containing termiticide is added,
There are methods such as applying termiticides, and (method @) includes applying anti-termite treatment to the soil of the installation route.

Among these methods, from the viewpoint of processing of electric wires and cables and mainly from the viewpoint of cost, the method of adding a termiticide to the sheath material of electric wires and cables has been most commonly adopted. In particular, so-called dorin-based drugs such as aldrin, dieldrin, and endrin were mainly used, but their use has now been prohibited as it has become clear that they are harmful to humans and animals and cause environmental pollution (October 1981) 2nd day,
Cabinet Order No. 308).

Therefore, instead of using drugs, measures are now increasingly being taken from the viewpoint of structural design and material design.

That is, methods such as protecting the cable itself with a metal sheath or adding a coating layer such as nylon on the cable sheath are beginning to be adopted.

However, no matter which of the cable structures mentioned above, the connecting parts of electric wires and cables must be independently treated for termites. That is, the cable connection portion is usually covered with lead tape or the like, and although it has a fairly high termite resistance, it is not perfect. Therefore, it is effective to apply an anti-corrosion tape containing a termite-proofing agent to the outermost bag of the cable connection part in order to make the termite-proof property more complete.

Rubber or plastic compositions that can be used in anti-corrosion tapes having termite-proofing properties include plastics containing extracts of Hiikiasunaro wood (Japanese Utility Model Publication No. 52-34623);
Plastics containing 10% by weight or more of creosote oil (Japanese Patent Publication No. 57-30787), PVC containing polyester plasticizer (molecular weight 3000 or more) (Japanese Patent Publication No. 10, 1988) HOOHX is Br Y is A resin composition containing 5 to 50 parts by weight of one or more compounds represented by a C1 to C4 alkylibane group (Japanese Utility Model Application Publication No. 140016/1983), fenitrothion, phoxim, or chlorpyrifos, and zinc octylate or PVC mixed with zinc persate, etc. (JP-A-58-25012 or JP-A-58
-142927, JP-A-58-169810), etc. are known.

Taking anticorrosion tape for electrical wire and cable connections as an example,
Since the electric wires and cables will be used for a long period of time, the termite-proofing agent added thereto must have excellent long-lasting anti-termite effect.

In particular, it is desirable that there is very little volatilization during the material mixing process or the tape processing process, and that it has thermal stability even under conditions of several minutes to one hour at a temperature of about 160 to 220°C. It is desirable that no blooming occurs even after molding. Moreover, it is of course undesirable that the mechanical properties, electrical properties, and other properties of the base material are impaired after being wound around the cable connection part.

However, there has been no anti-corrosion tape containing a termiticide that satisfies the above properties and also has an excellent anti-termite effect.

(Disclosure of the Invention) As a result of various studies, the present inventors have found that a specific organic lino agent that has excellent termite-proofing effects and low thermal decomposition properties especially at high temperatures is widely used in joint materials for electric wires and cables. P
It was discovered that when blended with VC, blooming etc. did not occur, and based on this finding, the anticorrosion tape having anti-termite properties of the present invention was completed. That is, the present invention is an anticorrosion tape characterized by containing bis, .(2,3,3,3-tetrachloropropyl)ether as an active ingredient in rubber or plastic.

B as bis(2,3,3,3-tetrachloropropyl)ether (hereinafter referred to as the present compound) according to the present invention.
There is a product name S-421 manufactured by ASF.

In the present invention, the present compound is added to rubber or plastic in an amount of usually 0.01 to 10% by weight, preferably 0.05 to 10% by weight.
Contain 5% by weight.

In the present invention, as the base rubber or plastic of the tape material, for example, polyethylene, ethylene-
A composition obtained by blending an ethylene-vinyl acetate copolymer or a chlorinated polyolefin with a polyolefin such as an α-olefin copolymer, or a vinyl chloride resin (PVC) is used. Others include butyl rubber, natural rubber, EP rubber,
Rubber such as NBR is used.

The present compound can be mixed with the above-mentioned rubber or plastic by a conventional mixing method (mixing using calender rolls, Banbury, etc.).

The anti-corrosion tape of the present invention, which is made by blending this compound into the tape material, has superior termite-prevention effects as well as electrical properties necessary for electric wires and cables, compared to those using other termiticides. The following experiment shows that it is also excellent.

Table 1 Number Name Molecule Formula 4 Bis(2
, 3,3,3-tetrachloropropyl) ether (this compound) CICIHHClCl Regarding the termiticide properties of the drugs themselves shown in Table 1, the following anticidal efficacy test was conducted, and the results shown in Table 2 were obtained.

Anticide efficacy test (knockdown test) (a) Dilution solvent: acetone Drug concentration 0.1% and 1
%.

(b) Test termites: House termites, worker ants (c) Test method: According to the method specified by the Japan Termite Countermeasures Association, the termiticidal activity of the drug was evaluated based on the mortality rate after 24 hours (25'C). .

(Unit: Mortality rate % after 24 hours) (Test sheet) pVC (degree of polymerization: approximately 1100-1300) 100
50 parts plasticizer (phthalate ester) 50 parts filler (heavy calcium carbonate) 30 parts stabilizer (
PVC consisting of 5 parts (tribasic lead sulfate)
The termiticide shown in Table 1 &
13 with 10 minutes of press processing and 3% termiticide added
An X17an sample sheet was obtained. This 1mm thickness P
A 30 mm square piece of pine sapwood was covered with a VC sheet, the overlapping portions and end portions were completely sealed with adhesive tape with metal tape, and the sheet was subjected to a field test. Field tests were conducted for three years, and the results shown in Table 3 were obtained.

Further, the electrical properties (insulation resistance) of the PVC sheets obtained in the same manner are shown in Table 4.

Table 4 First, it can be seen from Table 3 that Prothiophos has sufficient anti-termitic and termiticidal properties as a drug itself, but in a field test, even a PVC sheet with 3% additive was penetrated through one thickness. Oops. Therefore, no anti-termite effect can be expected even if it is mixed into the covering for electric wires and cables.

Chlorpyrifos is added to 3% PVC as shown in Table 4.
The insulation resistance value of the sheet is reduced to about 1/1433 of that of the additive-free product (a decrease of more than 3 digits), making it unsuitable as a corrosion-proofing material for electric wires and cables.

In this respect, the present compound and fenitrothion only show a decrease of 0 to 2 digits, and can maintain the 1012Ω axis, which is generally required as an anticorrosive material for electric wires and cables.

(Tape processing test) A PVC compound with the same formulation as the test sheet was calendered as an anticorrosion tape material, and an anticorrosion tape (thickness: 1
．． Omm) was obtained. An appropriate amount of sample was taken from this anticorrosive tape, and the remaining amount of the added termiticide in the PVC material was determined. The results are shown in Table 5.

Table 5 (Unit: Residual Rate %) As shown in Table 5, most of the added amount of fenitrothion is decomposed and volatilized, making it impractical.

However, by lowering the material temperature during calendering as much as possible, it can be expected that the survival rate will improve to some extent, but in order to do so, it is necessary to suppress heat generation in the calendering machine, so it is necessary to reduce the number of rotations of the calender roll. This inevitably results in a decrease in the calendering speed and an increase in the calendering time, that is, an increase in the calendering cost. On the other hand, most of the PVC compound to which the present compound was added remained, and from this point as well, it can be seen that it is an extremely effective termiticide.

This compound does not cause blooming from the surface of the anticorrosive tape even after molding.

As described above, the anticorrosion tape of the present invention containing the present compound as an active ingredient not only has an excellent anti-termite effect, but also has extremely low volatilization and decomposition of the termite agent even during calendering.

Claims (1)

[Claims] (1) Screws (
An anticorrosive tape characterized by containing 2,3,3,3-tetrachloropropyl) ether as an active ingredient.