JPS6045218B2 - conductive mixture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixture that has excellent workability and conductivity when used in combination with an electrically insulating material or as a conductive material alone.

Many studies have been conducted on conductive mixtures.

For this reason, a large number of additives and methods of adding them have been reported, but none has been found that satisfies all of the requirements such as compatibility, processability, thermal stability, and resistance stability.

The present invention satisfies the above requirements.

That is, polyolefin or rubber elastomer 10
A composition containing 2 to m parts of alkylfluoranthene or alkylpyrene having 1 to 4 alkyl groups having 1 to 4 carbon atoms and carbon black has excellent processability. In particular, we have found that the volume resistivity can be easily lowered without any adverse effects such as inhibition or bleeding during the crosslinking reaction, and have thus arrived at the present invention.

The effects of the present invention are that, based on the above-mentioned formulation, excellent points such as improved workability during processing and improved properties of the mixture were demonstrated.

In order to obtain the desired volume resistivity, the amount of acetylene black used conventionally is less than 113, and the amount of IP of conductive furnace black (XC-72) is required. In the alkylfluoranthene or alkylpyrene that exhibits the above-mentioned excellent effects, an alkyl group having 1 to 4 carbon atoms, that is, 1 to 4 groups such as methyl, ethyl, propyl, butyl, etc., is bonded to the fluoranthene nucleus or pyrene nucleus. It was given to me.

These alkyl groups may be of any length in any position within these ranges. Those without an alkyl group have poor compatibility with polyolefins and have the disadvantage of bleeding. Further, those having more than 4 alkyl substituents are difficult to synthesize.

The alkylfluoranthene and alkylpyrene used in the present invention are as follows.

X: An integer of 1 to 4 (However, if there are two or more alkyl groups, these alkyl groups may be the same or different types.) Considering the structure, there are many isomers. However, in carrying out the present invention, it is not necessary that the substance be a pure substance, and there is no problem even if it contains these isomers.

Further, within the scope of the present invention, there is no problem even if a mixture of various alkylfluorancenes or a mixture of alkylpyrenes is used. The amount of alkylfluoranthene and alkylpyrene (hereinafter referred to as polycyclic aromatic oil) used in the present invention is 2 to 1 parts per 1 (1) part of the polymer (polyolefin or rubber elastomer). be. If the amount is less than 2 parts, the effect of improving mixing workability and reducing the volume resistivity will be lost.

Moreover, if it exceeds 1, there is a risk that defects such as occurrence of bleeding and reduction in workability (increased penetration into the extruder) may occur. In the present invention, polyolefins to which polycyclic aromatic oil is added include polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene-
Rubber elastomers are vinyl acetate copolymers, etc.
These include butyl rubber, nitrile rubber, polychloroprene, styrene-butadiene rubber, natural rubber, silicone rubber, etc. The effect of adding polycyclic aromatic oil is primarily due to its effectiveness as an operating oil, so improving processability when incorporating carbon black into polymers is similar to when using operating oil in the rubber industry. It is similar to the case of using operating oil for conductivity, and as for conductivity, as the name of polycyclic aromatic compounds suggests, they have a structure that allows electrons to flow easily, so carbon It is thought that the space between the black particles is filled with a substance through which electrons can easily flow, and this appears as a decrease in volume resistivity.

Examples of the present invention will be described below.

The sample was prepared by adding 2 parts of DCP (dikymyl peroxide) to a roll-kneaded mixture (in the case of silicone rubber, 1 part of triallyl isocyanurate was added in addition to 2 parts of DCP), and
The powder was adjusted to 1 powder and 1 layer thick at 65° C. and 100 kg/Clt (gauge pressure).

This sample was cut into a width of 10 T$L, and the volume resistivity was determined using a Wheatstone bridge with a distance between the electrodes of 8.5 cm. This measurement method is based on BS 2044 (MethOd
-2). As is clear from the above explanation, the conductive mixture of the present invention can be mixed by adding a polycyclic aromatic oil such as alkylfluoracene or alkylpyrene when preparing a mixture containing conductive carbon black. It has the synergistic effect of improving workability and significantly reducing volumetric efficiency, and can be widely applied to electrical applications, including electric wires and cables, industrial applications, and industrial applications.

Claims (1)

[Claims] 1 For 100 parts of polyolefin or rubber elastomer, add 2 to 4 alkylfluorancenes or alkylpyrenes having 1 to 4 alkyl groups having 1 to 4 carbon atoms.
A conductive mixture containing 10 parts of carbon black.