JPS5966006A - Flame resistant composition for wire and cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustible composition for electric wires and cables that does not generate logen gas during combustion.

Evurene polymers such as ethylene propylene copolymers and polyethylene, which have excellent electrical insulation properties, are often used for insulation of electric wires and cables.

As a recent trend, there is a strong demand for electric wires and cables used in nuclear power plants, vehicles, etc. to have a high degree of flammability in accordance with the UL standard VW-Lebel.

Conventionally, methods for making ethylene polymers flame retardant include mixing rogen-containing compounds, antimony trioxide, and phosphorus-containing compounds, but they produce a large amount of smoke in the event of a fire, and are harmful to humans. It is viewed as a problem because it emits harmful gases.

In light of this situation, a method of incorporating inorganic hydrates that generate very little smoke and do not generate toxic gases has been attracting attention.

Among inorganic hydrates, magnesium hydroxide is known to have the highest flame retardant effect because it releases crystal water near the decomposition temperature of the polymer and lowers the combustion heat in the system.

However, in order to provide the high degree of flame retardancy of the UL standard VW-Lebel, it is necessary to add magnene hydroxide to the mixture, which results in a problem of significantly lowering the tensile properties.

The present invention has been made based on the above, and is based on the UL standard vw-
The purpose of the present invention is to provide a flame-retardant composition for electric wires and cables that has a high degree of flame retardancy that satisfies 1, has excellent tensile properties (tensile strength and elongation), and does not generate toxic halogen gas when burned. It is something.

The combustible 4JJ composition of the present invention is an ethylene-based 4JJ composition.
00 fIf (3 parts magnesium hydroxide 100-20
0 ilj part dish part and inorganic tin compound 0.3 parts by weight or more 1
-It is formed by adding and crosslinking.

Examples of ebulene-based polymers include ethylene glopylene copolymer, ethylene propylene dieno terpolymer, polyethylene, ethylene vinyl acetate coboline, ethylene/ethyl acrylate copolymer, and ethylene butene copolymer. Used in combination with more than one species.

Magnesium hydroxide is preferably 100 to 200 weight parts per 100φ needle part of the ethylene polymer, t 13
0 to 18'O weight part is added. Addition amount is 100 cities,
B, the purpose is less than I! How many words can you say about flammability?
If the embroidery exceeds 200 layers, the tensile properties decrease;b;
It cannot be used as an insulation charge or sheath charge for wires and cables.

In the present invention, an inorganic tin compound is added in addition to /magnetic hydroxide/silk in order to improve flammability. Examples of inorganic tin compounds include stannous oxide and stannous oxide.
Examples include tin, tin oxide l-IJ Uno 1, and tin sulfide, and the catalytic action of these additions has the effect of improving flammability.

The amount added is at least 0.6 part by weight, preferably at least 0.5 part by weight, based on the ethylene polymer '00-@dish part, and if it is less than 0.6 part by weight, the flammable clay effect will not be exhibited.

The three components mentioned above are mixed uniformly and then molded by extrusion or the like, and then crosslinked.

As a crosslinking agent, dicumyl peroxite, 6-bis(
Organic peroxides represented by benzene (t-butylperoxyinogropyl) are suitable, and sulfur, ethylene dimecacrylate, diallyl phthalate, P-quinone quinone, etc. may also be used in combination as crosslinking aids according to 84. good.

Other antioxidants, lubricants, softeners, dispersants, etc. may be added as necessary.

Examples of antioxidants include phenyl-α-naphdylamine, -rmine-based antioxidants such as N,N-di-β-naphthyl-P-soenyl/n'rmine, and i,6-di-t-phthyl-4-methyl. Soenol-based substances such as phenol and hindered noenol are preferred.

In the following, examples of the present invention will be described in comparison with comparative examples.

The various ingredients were mixed in the proportions shown in Table 1, mixed with IU O''c using 6-inch and anti-roll, and then mixed with 120
'(40 m/m extruder kept at 7 (L/D=-
25), extrusion coated the outer periphery of the copper wire with an outer diameter of 2.0,
The insulated core wire was crosslinked by applying water vapor of 15 kg/ad for 6 minutes to obtain an insulated core wire.

Table 1 *1 Mouni viscosity ML I+ 4 (for j'LID) 40, ethylene amount 70 moles, Soropyreno total 6 u moles φ

Claims (1)

[Claims] 1. It is made by adding 100 to 200 parts by weight of hydroxide red sea bream/Uno and 0.6 parts by weight or more of an inorganic tin compound to 100 parts by weight of an ethylene polymer and crosslinking it!11[
We are looking for a flame retardant composition for 1L wires and cables.