JP3149515B2 - Flame retardant resin composition - Google Patents

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 more particularly to a flame-retardant resin composition having high flame retardancy and excellent heat resistance.

[0002]

2. Description of the Related Art Conventionally, polyolefins have been made flame-retardant by halogenated polyolefins such as chlorinated polyethylene and chlorinated paraffin, bromine-based and chlorine-based addition-type halogen-based flame retardants, magnesium hydroxide and aluminum hydroxide. Non-halogen flame retardants using hydroxides such as

[0003] Halogenated polyolefins can themselves be used as base polymers, but are generally used in a blend with other polyolefins. The halogen-based flame retardant is used by being added to the base polymer. These blend-type and additive-type halogen-based flame retardants can impart high flame retardancy to the resin composition. On the other hand, non-halogen flame retardants generate water during combustion, thereby suppressing combustion. Therefore, there is an advantage that toxic gas is hardly generated.

[0004]

However, according to the conventional flame-retardant resin composition, the halogen-based flame retardant has a drawback that it generates corrosive gas such as hydrogen halide at the time of combustion, and the non-halogen-based flame retardant is insufficient. In order to obtain excellent flame retardancy, a large amount of addition is required, and therefore, there is a disadvantage that the mechanical properties are reduced. Furthermore, these flame retardants have the disadvantage of lowering the heat resistance, and in order to have good heat resistance, a large amount of an antioxidant must be added, which causes bloom and bleed. .

Accordingly, an object of the present invention is to provide a flame-retardant resin composition having high flame resistance and excellent heat resistance.

[0006]

DISCLOSURE OF THE INVENTION In view of the above problems, the present invention aims at obtaining high flame retardancy and excellent heat resistance by adding 5 to 50 parts by weight of ethylene bistetratetraethylene to 100 parts by weight of an ethylene copolymer. An object of the present invention is to provide a flame-retardant resin composition containing bromophthalimide and 5 to 50 parts by weight of perchlorocyclopentadecane.

The ethylene copolymer used in the present invention includes ethylene-vinyl acetate copolymer, ethylene methacrylate, ethylene ethyl acrylate, ethylene metal methacrylate, linear low-density polyethylene, ultra-low-density polyethylene, ethylene propylene rubber, ethylene Propylene diene terpolymer, ethylene butyl acrylate and the like.

When ethylene bis-tetrabromophthalimide and perchlorocyclopentadecane are used in an amount of 5 parts by weight or less, good flame retardancy cannot be obtained, and in an amount of 50 parts by weight or more, flame retardancy is reduced and bloom is caused. In addition, each of these has a strong tendency to reduce heat resistance when used alone, but when used together, produces an effect of suppressing this. If an inorganic flame retardant such as antimony trioxide or antimony pentoxide is added to these halogen-based flame retardants, higher flame retardancy can be obtained. Crosslinking can be carried out as needed, but sulfur, organic peroxide, electron beam and the like can be used for crosslinking. In addition, crosslinking aids, antioxidants, inorganic fillers, carbon black,
Colorants, lubricants and the like may be added in appropriate amounts.

[0009]

EXAMPLES The flame-retardant resin composition of the present invention will be described below in detail with reference to Table 1.

[Table 1]

Each component (parts by weight) shown in Table 1 was
The mixture was kneaded with a 6-inch roll maintained at １２０120 ° C. This was further preformed by pressing at 120 ° C. for 1 minute, and subjected to steam crosslinking (12 kg / cm ² × 3 minutes) to prepare a sheet having a thickness of 1 mm. Crosslinking was performed by chemical crosslinking using an organic peroxide (dicumyl peroxide). The evaluation test of heat aging resistance was performed according to UL Subject 758, and the evaluation of flame retardancy was performed according to JIS D-1201.

In terms of heat resistance, the combined use of ethylene bis-tetrabromophthalimide and perchlorocyclopentadecane is clearly more effective than when each is used alone. In particular, perchlorocyclopentadecane alone significantly reduces heat resistance. The synergistic effect of this combination is most preferably 1: 1. In addition, it was also confirmed that when these flame retardants exceeded the amount initially restricted, the heat resistance was reduced and bloom was generated. In a system using a halogen-based flame retardant, if the oxygen index which is a measure of flame retardancy is 28 or more, a vertical flame test (VW-
Since it is considered that 1) can be passed, it can be seen that the examples of the present invention show high flame retardancy.

The above results show that the composition of the present invention is flame-retardant and has excellent heat resistance.

The flame-retardant resin composition of the present invention can be used not only as a covering material for an electric cable but also as a packing or a waterproof sheet.

[0014]

As described above, according to the flame-retardant resin composition of the present invention, 5 to 50 parts by weight of ethylene bis-tetrabromophthalimide and 5 to 50 parts by weight are added to 100 parts by weight of the ethylene copolymer. Since it contains perchlorocyclopentadecane, high flame retardancy and excellent heat resistance can be obtained. Therefore, it is extremely useful as an insulating material for electric wires and cables.

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-138732 (JP, A) JP-A-4-298551 (JP, A) JP-A-4-38112 (JP, A) JP-A-4-13861 11644 (JP, A) JP-A-1-153742 (JP, A) JP-A-57-185334 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H08L 23/00-23 / 36 C08K 5/00-5/59

Claims (1)

(57) [Claims] 1. A flame-retardant resin comprising 5 to 50 parts by weight of ethylene bis-tetrabromophthalimide and 5 to 50 parts by weight of perchlorocyclopentadecane per 100 parts by weight of an ethylene copolymer. Composition.