JPH072874B2 - Anti-termite flame retardant composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composition which is excellent in termite resistance, flame retardancy and low smoke generation property, and is therefore suitable as a coating material for electric wires.

[Conventional technology]

Polyolefin has excellent electric insulation properties, but has a drawback of being easily flammable. Therefore, it has been used for a long time to make it flame-retardant. As the flame retardant, various inorganic flame retardants and organic flame retardants are known. Polyolefins, when used in the habitat of termites, are susceptible to feeding damage by termites, so it is necessary to prevent them.

[Problems to be solved by the invention]

Conventionally, halogen-based organic flame retardants have been widely used for flame-retarding polyolefins, but such a polyolefin-based flame-retardant composition generates a large amount of corrosive halogen-containing gas when burned. There's a problem. On the other hand, copper naphthenate is widely used as an anti-termite agent for polyolefins, but the termite-proof effect is not always sufficient.

[Means for solving problems]

In view of the above-mentioned conventional state of the art, the present invention is for an anti-termite flame-retardant electric wire coating which is excellent in termite resistance, flame retardancy and low smoke generation, and does not generate corrosive gas even when burned. The object of the present invention is to provide a polyolefin composition suitable as.

That is, the present invention, 100 parts by weight of polyolefin, 50 to 200 parts by weight of a non-halogen flame retardant, and 0.5 to 10 parts by weight of a mixture of zinc versatic acid and phennitrothion as an anti-termite agent. And an anti-termite flame retardant composition for electric wire coating.

[Action]

Since all of the essential components of the composition of the present invention do not contain halogen, unless a halogen-containing drug is used as a compounding agent other than the essential component, a corrosive halogen-containing gas is generated even when burned. There is no. Further, zinc versatate and phennitrothion used as the spinning agent in the present invention show an excellent anti-termite effect even when used in combination with a non-halogen flame retardant.

Examples of the polyolefin used in the present invention include poly-α-olefins such as polyethylene, polypropylene, polybutene and poly-4-methylpentene, and copolymers of α-olefins such as ethylene-propylene copolymer and ethylene-butene copolymer with α-olefin. Copolymers of olefins with other comonomers, such as ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, etc., and one or more of them are used. Among the above-mentioned polyolefins, particularly preferable are poly-α-olefins such as polyethylene, ethylene-α-olefin copolymers, ethylene-vinyl acetate copolymers, ethylene-methyl acrylate copolymers, or ethylene-ethyl acrylate copolymers. It is united.

Examples of the non-halogen flame retardant used in the present invention include alumina hydrates such as aluminum hydroxide, magnesium hydroxide, hydrates of metal oxides such as hydrotalcites, antimony trioxide, antimony pentoxide, and dioxide. Metal oxides such as titanium, zinc oxide, magnesium oxide, and aluminum oxide, other inorganic flame retardants such as zinc borate and magnesium carbonate, and organic phosphates, phosphorus-based flame retardants such as red phosphorus, and the like. .

In the present invention, a mixture of zinc versatic acid and fenitrothion is used as an anti-termite agent. The ratio of zinc versatate to fenitrothion used was 40 parts fenitrothion per 100 parts by weight zinc versatate.
About 200 parts by weight is suitable.

For the amount of each of the above components used, refer to Polyolefin 10
50 to 200 parts by weight of non-halogen flame retardant per 0 parts by weight,
The mixture of zinc versatate and fenitrothion as an antitermite is 0.5 to 10 parts by weight. When the amount of the non-halogen flame retardant used is less than 20 parts by weight, it tends to be difficult to obtain a composition having good flame retardancy, while when the amount of the non-halogen flame retardant used is more than 200 parts by weight. , The mechanical properties and processability of the composition tend to deteriorate. If the amount of the termite control agent used is less than 0.5 parts by weight, the termite control effect is poor,
On the other hand, even if more than 20 parts by weight is used, the termite proof effect is saturated and the effect of increasing the termite proof material is poor. Therefore, the preferred amount of the non-halogen flame retardant is 50 to 200 parts by weight, especially 80 to 150 parts by weight, per 100 parts by weight of the polyolefin, while the amount of the termite-preventing agent is 0.5 to 100 parts by weight of the polyolefin. 10 parts by weight, especially 1 to 5 parts by weight.

Clay, talc, carbon black and other inorganic fillers, antioxidants, coupling agents, processing aids, pigments and other usual compounding agents may be added to the composition of the present invention in conventional amounts, if desired. I don't care. In addition, the composition of the present invention,
Crosslinking can be performed by a chemical crosslinking method such as organic peroxide crosslinking or water crosslinking, or a method such as electron beam irradiation crosslinking.

〔effect〕

The composition of the present invention is excellent in termite resistance, flame retardancy, and mechanical properties, and since it does not generate corrosive gas even when burned, an electric wire laid in a place where there is a risk of feeding damage by termites. It is extremely useful as a coating material for

〔Example〕

The present invention will be described in more detail with reference to Examples and Comparative Examples.
Unless otherwise specified below, parts and% mean parts by weight and% by weight, respectively.

The compositions of various Examples and Comparative Examples shown in the attached table were kneaded with two rolls, and then press-molded at 150 ° C. for 5 minutes to process into a sheet. The following tests were performed on each sheet.

Flame retardance: Measures oxygen designation by the method specified in JIS K7201.

Ant-proof property ... Placing plaster on the bottom of a cylindrical container with a diameter of 8 cm and a depth of 6 cm, and placing a 5 cm square 1 mm thick sample sheet on it.
10 were thrown in. Place this cylindrical container on the bottom of a water tank type glass test container with wet absorbent cotton spread on the bottom,
The test container was kept at 28 ± 2 ° C., and the number of termite deaths after 120 to 240 hours was examined.

Mechanical properties: Tensile strength and elongation were measured by a Shopper type tensile tester. The above test results are shown in the same table.

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Claims (1)

[Claims] 1. A halogen-free flame retardant in an amount of 50 to 200 parts by weight, and a mixture of zinc versatate and fenitrothion as an anti-termite agent in an amount of 0.5 to 1 with respect to 100 parts by weight of a polyolefin.
An anti-termite flame-retardant composition for electric wire coating, which is characterized by containing 0 part by weight.