JPH1180443A - Flame-retardant resin composition and electric wire and cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame-retardant resin compsn. having both a high flame retardance and excellent mechanical properties by compounding a polyolefin resin with an inorg. metal hydrate treated with a specific surface treatment. SOLUTION: Ethylene is copolymerized with at least 5 wt.% unsatd. carboxylic acid, unsatd. carboxylic ester, or acid anhydride to give a polyolefin resin. An inorg. metal hydrate comprising magnesium hydroxide or aluminum hydroxide is treated with a surface treatment which is represented by the formula: R-X (wherein R is a 20C or higher aliph. hydrocarbon group contg. at least one unsatd. group; and X is a reactive terminal group) and is liq. at 25-40 deg.C, giving an inorg. metal hydrate with 0.5-3 wt.% surface treatment attached thereto. The above-obtd. polyolefin resin is compounded with 50-250 pts.wt. this surface-treated inorg. metal hydrate and, if necessary, an antioxidant, an ultraviolet-absorber, a copper inhibitor, a lubricant, a pigment, a filler, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant resin composition and an electric wire / cable using the same as a coating material.

[0002]

2. Description of the Related Art Conventionally, as a metal inorganic hydrate used as a flame retardant of a flame-retardant resin compound, those having been subjected to a surface treatment in order to enhance dispersibility and compatibility with a polymer have been generally used. . As the surface treating agent, those having a hydrocarbon group having 17 carbon atoms such as stearic acid and oleic acid are generally used.

[0003]

However, even if a flame-retardant resin composition is prepared by blending a flame-retardant surface-treated with the above-mentioned surface-treating agent, it is not sufficient for use as a covering material for electric wires and cables. No mechanical strength could be obtained. Accordingly, an object of the present invention is to provide a flame-retardant resin composition having both flame retardancy and mechanical properties, and an electric wire / cable using the composition.

[0004]

Means for Solving the Problems The present invention has been made to achieve the above object, and the feature of the present invention is that (A) is 50 to less than 250 parts by weight for 100 parts by weight of (B) below. It is in the compounded flame retardant resin composition. (A) Metal-inorganic hydrate surface-treated with a surface treatment agent represented by the following formula R-X R is an aliphatic hydrocarbon group having 20 or more carbon atoms X is a reactive terminal group (B) Polyolefin resin

Here, the polyolefin resin B is preferably a polyolefin copolymer obtained by copolymerizing ethylene with an unsaturated carboxylic acid, an unsaturated carboxylic acid ester or an acid anhydride. In that case, the copolymerization ratio is 5wt
% Is preferable.

The surface treating agent in (A) includes behenic acid and montanic acid. Further, the aliphatic hydrocarbon group contains one or more unsaturated bonds, and the property thereof is 25 to 40.
Those which are liquid at ° C are desirable. Further, (A)
Is preferably a COOH group.

[0007] Examples of metal inorganic hydrates include magnesium hydroxide and aluminum hydroxide. The treatment amount of the surface treating agent with respect to the metal inorganic hydrate is preferably 0.5 to 3% by weight.

The electric wire / cable of the present invention is characterized in that any one of the above flame-retardant resin compositions is used as a covering material.

In the present invention, since a surface treatment agent for a metal inorganic hydrate, which is a flame retardant, has a longer hydrocarbon group (R) than conventional ones, it is easily compatible with the base polymer and the mechanical properties of the resin composition are increased. It is assumed that the characteristics can be improved. The surface treatment method may be dry or wet.

The amount of the flame retardant to be added is 50 parts by weight or more and 25 parts by weight.
The reason why the amount is less than 0 parts by weight is that if the amount is less than the lower limit, a sufficient flame retarding effect cannot be obtained, and if the amount exceeds the upper limit, sufficient mechanical properties cannot be obtained. Further, the amount of the surface treatment agent is 0.5 to 3 watts.
The reason why it is set to t% is that the effect of improving the mechanical properties is not seen below the lower limit, and the effect reaches a plateau when it exceeds the upper limit. Furthermore, the reason why the copolymerization ratio of the polyolefin resin serving as the base polymer is set to 5% by weight or more is that if it is less than this value, the flame retardancy becomes insufficient.

The flame-retardant resin composition of the present invention may optionally contain an appropriate amount of an antioxidant, an ultraviolet ray inhibitor, a copper damage inhibitor, a lubricant, a pigment, and a filler.

[0012]

Embodiments of the present invention will be described below. After kneading each material shown in Tables 1 and 2 with a 6-inch open roll for 15 minutes, the following strength / elongation test and flame retardancy test were performed. Tables 1 and 2 also show the results of each test. In the table, the surface treatment agent for metal inorganic hydrate D is 2
Liquid at 5-40 ° C.

(Strength / elongation test) 1 mm
The sheet was formed into a thick sheet and tested based on JIS C 3005.18.

(Flame Retardancy Test) The composition was extrusion-coated with a thickness of 1.5 mm on a conductor having a cross-sectional area of 60 mm ² , and a 60 ° inclined flame retardancy test was carried out based on JIS C 3005.28. The criterion for the test was that the fire extinguished was passed, and the fire extinguishing was rejected.

The surface treatment of the metal hydrate was carried out as follows. To a metal inorganic hydrate stirred at 800 rpm in a Henschel mixer, a predetermined amount of a surface treatment agent diluted with 99.9% toluene five times the amount of the surface treatment agent was added dropwise.
The dropping was performed for 10 minutes, and after the dropping, stirring was continued for another 10 minutes. Thereafter, the mixture was taken out, and toluene was dried and removed at 130 ° C. × 1 hour to complete the surface treatment.

[0016]

[Table 1]

[0017]

[Table 2]

As shown in these tables, each of the examples was excellent in strength and elongation and excellent in flame retardancy. On the other hand, in Comparative Example 1, the stearic acid treatment in which the carbon number of the hydrocarbon group (R) was 17 was performed, and the strength and elongation were the same in Examples 1 and 3 in the same addition amount and surface treatment amount. , 4.
In Comparative Example 2, when the surface treatment amount was less than 0.5 wt%, sufficient mechanical properties were not obtained. In Comparative Example 3, the surface treatment amount exceeded 3 wt%, and the mechanical properties reached a plateau or decreased as compared with Example 6. In Comparative Example 4, the amount of the metal inorganic hydrate added was less than 50 parts by weight, and the flame retardancy was insufficient. In Comparative Example 5, the addition amount of the metal inorganic hydrate was 250 parts by weight,
Both growth is insufficient. Furthermore, in Comparative Example 6, when the copolymerization ratio of the copolymer was less than 5% by weight, the flame retardancy was not sufficient.

The flame-retardant resin composition as described above is preferably used as a covering material for electric wires and cables. For example, it can be used as an insulator for electric wires and cables or as a sheath material. The structures of electric wires and cables to be used are not particularly limited.

[0020]

As described above, the flame-retardant resin composition of the present invention can have both flame retardancy and mechanical properties (strength / elongation). Therefore, it is optimal to use it as a covering material for electric wires and cables requiring flame retardancy.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Inoue 1-3-1 Shimaya, Konohana-ku, Osaka-shi In the Osaka Works, Sumitomo Electric Industries, Ltd. (72) Inventor Hiroshi Kobayashi 1-1-1-1 Shimaya, Konohana-ku, Osaka-shi No. 3 Sumitomo Electric Industries, Ltd. Osaka Works (72) Inventor Masaaki Yamauchi 1-3-1, Shimaya, Konohana-ku, Osaka City Sumitomo Electric Industries, Ltd. Osaka Works (72) Inventor Akira Mizoguchi Shimanaya, Konohana-ku, Osaka City 1-3-3, Sumitomo Electric Industries, Ltd., Osaka Works

Claims (8)

[Claims] 1. A flame-retardant resin composition comprising (A) in an amount of 50 to less than 250 parts by weight based on 100 parts by weight of the following (B). (A) Metal-inorganic hydrate surface-treated with a surface treatment agent represented by the following formula R-X R is an aliphatic hydrocarbon group having 20 or more carbon atoms X is a reactive terminal group (B) Polyolefin resin 2. The flame retardant according to claim 1, wherein the polyolefin resin of B is a polyolefin copolymer obtained by copolymerizing ethylene with an unsaturated carboxylic acid, an unsaturated carboxylic acid ester or an acid anhydride. Resin composition. 3. The flame-retardant resin composition according to claim 2, wherein the copolymerization ratio is 5% by weight or more. 4. The surface treating agent in (A) contains one or more unsaturated bonds in an aliphatic hydrocarbon group and has a property of 2 or more.
The flame-retardant resin composition according to claim 1, which is in a liquid state at 5 to 40C. 5. The method according to claim 1, wherein the reactive terminal group in (A) is COOH.
The flame-retardant resin composition according to claim 1, which is a base. 6. The flame-retardant resin composition according to claim 1, wherein the treatment amount of the surface treating agent to the metal inorganic hydrate is 0.5 to 3 wt%. 7. The flame-retardant resin composition according to claim 1, wherein the metal inorganic hydrate is magnesium hydroxide or aluminum hydroxide. 8. An electric wire or cable using the flame-retardant resin composition according to claim 1 as a covering material.