JPH0212709A - Mold-proof cable - Google Patents

Abstract

PURPOSE:To obtain an excellent mold-proof effect being harmless to humans and animals by applying a water solution containing either one kind or both kinds of dimethyl silicone or methyl phenyl silicone on the surface. CONSTITUTION:A water solution containing 3 to 20wt.% of either one kind or both kinds of dimethyl silicone or methyl phenyl silicone is applied on the surface of a cable. Thereby, a wire or the cable being harmless and excellent in mold-proofness. In this case, the wire and the cable use rubber and plastics as a sheath protective layer while especially showing a remarkable effect for a power cable using a polyvinyl chloride mixture as the sheath protective layer and an optical and communication cable or a power cable using non-halogen incombustible polyolefin mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention aims to provide a harmless electric wire or cable that is excellent in mold-proofing properties.

(Prior Art) Conventionally, a mixture mainly composed of polyethyl or polyvinyl chloride has been used as a sheath protective layer provided on the outermost layer of an electric wire or cable. However, in recent years, when wiring these electric wire cables in underground tunnels or inside the floor walls of buildings,
6D, which places emphasis on disaster prevention, is designed to make the protective layer flame retardant.

Therefore, in order to make a mixture of polyvinyl chloride, polyethylene, etc. flame retardant, it is possible to achieve that purpose by adding a large amount of inorganic metal hydroxide such as aluminum hydroxide or magnesium hydroxide to the mixture. However, as a result, the hygroscopicity of the sheath protective layer increases.

Generally, electric wires and cables are installed in underground tunnels as mentioned above.

Since it is often installed in places with high temperature and high humidity environments such as the floors and walls of buildings, if the protective layer has a high degree of moisture absorption as described above, mold will inevitably grow, which will worsen the environment. In addition to impairing the appearance and degrading the protective layer in severe cases, in order to improve this problem, it is necessary to mix an anti-mildew material into the above-mentioned mixture or to add an anti-fungal agent to the surface of the protective layer. Is it coated with moldy material? 5. All of the known anti-mold materials contain chlorine or arsenic, which are harmful to environmental hygiene, and there has been a demand for non-toxic countermeasures.

(Problems to be Solved by the Invention) In view of the current situation, the present invention has conducted extensive research and has developed a mold-proof cable that is harmless to humans and animals and has an excellent mold-proofing effect.

(!!Means for solving the problem) The present invention contains 3 to 20 wt% of either dimethyl silicone or methylphenyl silicone or both on the surface of an electric wire or cable having a sheath protection layer on the outermost layer. The special feature is that it is coated with an aqueous solution.

In the present invention, electric wires and cables are those using rubber or plastic as a sheath protection layer.

It is particularly effective for electrical cables using a vinyl chloride mixture as a sheath protective layer, optical fiber cables or electrical cables using a non-flame retardant/IJ olefin mixture as a sheath protective layer.

The reason for this is that both polyvinyl chloride mixtures and non-heron flame-retardant polyolefin mixtures contain inorganic metal hydroxide-based flame retardants such as magnesium hydroxide and aluminum hydroxide, calcium carbonate, flakes, alumina, and silica. Since a large amount of the filler is blended, the protective layer increases hygroscopicity and becomes susceptible to mold growth. Therefore, it acts effectively on such mixtures and can prevent the growth of mold as much as possible.

Although it is not possible to elucidate in detail the mechanism by which dimethyl silicone or methylphenyl silicone prevents the growth of mold in the present invention, it is possible to apply this silicone to the surface of electric wires and cables. It is assumed that this is to impart water-based properties.

Although the above silicone content was limited to 3 to 20 wt% VC, if it was less than 3 wt%, the effect of preventing mold growth would be weak, and if it exceeded 20 wt4, the effect of preventing mold growth would be weak. This is because it almost reaches a saturation state.

(Example) Examples 1 to 3 Polyvinyl chloride resin 10 was used as the outermost sheath layer.
0 parts by weight, 50 parts by weight of plasticizer, 20 parts by weight of aluminum hydroxide, 2 parts by weight of clay, 1 part by weight of antimony trioxide.
6,6k obtained by extrusion coating a mixture containing 0 parts by weight
An aqueous solution emulsion containing 5% by weight of dimethyl silicone on the surface of the VCV cable 1oo■ (Example 1), an aqueous solution emulsion containing 18% by weight of dimethyl silicone (Example 2), 5% by weight of methylphenyl silicone
An aqueous solution emulsion (Example 3) containing the following was uniformly applied and dried to obtain a mold-resistant cable of the present invention.

Examples 5 to 6 Ethylene acetate pyru copolymer (MFR6, containing vA @19*) was used as the outermost sheath layer.

Aqueous emulsion containing 4% by weight of methylphenyl silicone on the surface of a communication cable obtained by extrusion coating a non-halodan flame-retardant polyolefin mixture to which 120 parts by weight of magnesium hydroxide has been added (4m example 4)
, an aqueous emulsion containing 18 parts of methylphenyl silicone.

(Example 5) and an aqueous emulsion containing 110% by weight of trimethylsilicone (Example 6) were uniformly applied and dried to obtain a mold-resistant cable of the present invention.

Conventional Example A conventional CV cable was obtained in the same manner as in Example 1 except that the coating layer of dimethyl silicone was not provided.

Comparative Example 1 A comparative mold-proof cable was obtained in the same manner as in Example 1, except that an aqueous solution emulsion containing double dimethyl silicone was applied as the aqueous solution emulsion of dimethyl silicone.

Comparative Example 2 A comparative mold-proof cable was produced in the same manner as in Example 4, except that an aqueous emulsion containing 2 parts by weight of methylphenyl silicone was applied as the aqueous emulsion of methylphenyl silicone.

Regarding the thus obtained mold-proof cable of the example of the present invention, the mold-proof cable of the comparative example, and the conventional CV cable, JISZ
A mold resistance test was conducted based on -2911. That is, they were left in an environment with a temperature of 2f±2°C and a humidity of 95 to 98%, and the presence or absence of mold growth was measured.

The results are shown in Table 1.

Table 1 (Effects of the Invention) As detailed above, the mold-proof cable of the present invention is safe and harmless to humans and animals, and has excellent mold-proof properties, so it can be used in tunnels, buildings, etc. with high humidity. It is extremely useful industrially as it can be used for a long time without causing mold.

Claims (1)

[Claims] An electric wire or cable having a sheath protection layer on the outermost layer, or a mold-proof cable characterized in that the surface of the cable is coated with an aqueous solution containing 3 to 20 wt% of either dimethyl silicone or methyl phenyl silicone, or both.