JPS59132504A - Plastic conductive material - 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 plastic conductive material, and particularly provides a conductive material suitable for electronic and electrical equipment.

In general, insulators such as plastics, semiconductors such as Ge1Si, carbon black, and graphite, and conductors such as metals each have a unique volume resistivity.

The volume resistivity of the insulator is 10 8 Ω·em or more, the volume resistivity of the semiconductor is io−′ to 10 8 Ω·cm, and the volume resistivity of the conductor is 10 −3 Ω·cm or less.

The volume resistivity of these electrical materials changes with temperature changes.

That is, the volume resistivity of an insulator decreases as the temperature increases;
Conversely, the volume resistivity of semiconductors and conductors generally increases as the temperature rises. In particular, conductive materials made by mixing carbon such as carbon black with plastic are used in various electrical devices because they are lightweight, easy to work with, and inexpensive. As mentioned above, the volume resistivity of conductive materials also tends to increase as the temperature increases.

Therefore, electric or electronic equipment using a conductive material made by kneading this carbon black or the like has the disadvantage that its characteristics change depending on the temperature, making it impossible to maintain constant performance.

It is an object of the present invention to eliminate the drawbacks of the conventional materials as described above and to provide a plastic 4v electrical material whose volume resistivity is not affected by temperature changes.

That is, the present invention is a plastic conductive material characterized by being made of plastic to which conductive carbon and Merck, which is an inorganic filler, are added.

The plastic used for the present invention is a thermoplastic such as polyethylene, polypropylene, or ethylene-propylene copolymer, and the content of conductive carbon is 5.
The content of talc, which is an inorganic filler, is 5 to 50%.
5) Make it a spear.

The reason for setting the conductive carbon content to 5 to 50 is that if it is less than 5, the conductivity of the plastic conductive material will deteriorate, and if it is more than 50, it will be difficult to create a plastic conductive material. .・Also, the reason why the content of Merck, which is an inorganic material, is set to 5 to 50 g is because if it is less than 5 g, the volume resistivity of the plastic conductive material will be easily affected by temperature changes, and if it is more than 50 g, the plastic conductivity will be This is because the plastic conductive material of the present invention has a volume resistivity that is almost unaffected by temperature changes, and electrical or electronic equipment using this conductive material will be difficult to produce due to temperature changes. It has the effect of maintaining stable performance even when Furthermore, since the volume resistivity of the plastic conductive material of the present invention is almost unaffected by temperature changes, it has the effect of fulfilling the role of a standard resistor.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

The pages of the present invention and comparative examples used in the Examples and Comparative Examples were created as follows: n, fc. That is, raw materials having a predetermined composition ratio were put into a pressure kneader heated to 180°C, kneaded for 15 minutes, and then a sheet of 1 mm thick was prepared using calender equipment. This shows the ratio of each raw material.

table The numbers are heavy.

1 for each example and comparative example? The following plastics, conductive carbon, and Merck were used.

Example 1 and Comparative Example 1 Ethylene-propylene copolymer (Tokuyama Sorb MS 62
4) Conductive carbon C0ND (J"C'L'EXzo50
(Ko.

/ Toa Carbon Co.) Talc Nippon Talc N, D Example 2 and Comparative Example 2 Polyethylene (Showa type soil F'XO860) mi'K
'□Carboy VtJLCANXC-72 (Cab
otsha9 Talc Nippon Talc MS Example 6 and Comparative Example 6 Polyethylene (Mitsui Petrochemical 5UOOF) Song/Song...
...Example 6 〃 (Showa ttt engineering FX086U) Four...songs...
Comparative Example 6 4-electroconductive carbon C0NDUcTEX975 (Columbia-Carbon Co., Ltd. Ditalc Nippon Taruri ND Example 4 and Comparative Example 4 No'Robylene (Tokuyama Soda MS230) Conductive carbon VU[, CANXC-72 (Caboe) Japan Talc MS Figure 1 shows the resistivity of 1*a) with respect to temperature changes for the materials shown in Example 11 and Comparison Report.

In the figure, a'-1 to 4 represent the characteristics of Actual I & Examples 1 to 4, and u-
1 to 4 show the characteristics of Comparative Examples 1 to 4, respectively.

As is clear from the figure, it is made by mixing Merck (9
-1 to 4) are those in which talc is not kneaded (b).
-1 to 4), the change in volume resistivity with respect to temperature change is extremely small, and the volume resistivity is also reduced.

[Brief explanation of drawings]

FIG. 1 is a temperature characteristic diagram of volume resistivity of an example of the present invention and a comparative example.

Claims (1)

[Scope of Claims] A plastic conductive material characterized by being made of a +11 plastic mixed with conductive carbon and talc, which is an inorganic filler. i2+ plastics are polyethylene, polypropylene,
The plastic conductive material described in item 1 of the scope of Patent I Qingui, characterized in that it is an ethylene-propylene copolymer. (:() The plastic conductive material according to claim 1 or 2, characterized in that the ownership ratio 'f of conductive carbon is 5 to 50 cm. The plastic conductive material according to any one of claims 1 to 3, characterized in that the content of talc is 5 to 50 g.