JPS6053560A - Conductive polyphenylene sulfide resin composition - Google Patents

Abstract

PURPOSE:To obtain at low-cost, practically, titled composition of high stability, useful for resistance exothermic body, electronic device material, etc., by incorporating polyphenylene sulfide resin with conductive carbon black. CONSTITUTION:The objective composition can be obtained, for example, by kneading in a molten state (A) 100pts.wt. of a polyphenylene sulfide resin (PPS) such as poly(p-phenylene sulfide), with (B) 10-40pts.wt. of conductive carbon black such as acetylene black to homogeneously disperse said carbon black in the PPS and furthermore by incorporating a small amount of bromine in the system prior to or posterior to the molding process.

Description

Detailed Description of the Invention The present invention uses polyphenylene sulfide resin (hereinafter pps
It relates to a conductive resin composition based on

Conventionally, moldable resin compositions in which conductive powder, such as conductive carbon, is dispersed in a synthetic resin that is an electrical insulator are widely known. Also, pps or its molded products are A,
It is also known to obtain conductive pps by doping with Fs, sulfuric acid, or the like.

For example, pps doped with A or F has problems with toxicity and has extremely low stability, so it cannot be said to be of practical use.

Furthermore, materials doped with sulfuric acid or SO8 have strong acidity and do not adversely affect other components or the atmosphere to which they are combined, so this also poses a major practical problem.

As a result of intensive research aimed at solving the above-mentioned drawbacks of the prior art, the present inventor succeeded in obtaining a conductive pps composition that is highly stable and poses no practical problems, leading to the present invention.

That is, the present invention is a conductive pps composition comprising pps and conductive carbon black.

To explain the present invention in detail, P used in the present invention
PS includes poly(para-phenylene sulfide), poly(meta-phenylene sulfide), poly(para-phenylene sulfide+meta-phenylene sulfide), and the like. These PPSs themselves are well known and readily available on the market.

The conductive carbon black used in the present invention is
Acetylene black, furnace black, etc. are also known per se and are easily available on the market.
It can be obtained by uniformly dispersing the above conductive carbon black in PS. Advantageously, the conductive carbon black is used in a proportion of about 10 to 40 parts by weight per 100 parts by weight of PPS. As a method for dispersing conductive carbon black in pps, conventionally known techniques for dispersing pigments and various fillers in various thermoplastic resins can be used as they are. For example, a preferred method is to prepare a so-called masterbatch by melt-kneading pps or other thermoplastic resin and conductive carbon black, and then melt-kneading the masterbatch with pps to form a composition with a desired carbon concentration. For example, it is made into pellets or molded products. In the above, various conventionally known additives may be added to the extent that the object of the present invention is not obstructed.

The conductive pps composition of the present invention obtained as described above has approximately 10
It exhibits a resistance value of 2 to 1030, and is useful as various electrical materials.

The inventor continued his research and discovered that the above-mentioned conductive ppp
It has been found that by incorporating a small amount of bromine into the composition, for example, about 1 to 5 parts by weight per 100 parts by weight of the resin composition, its electrical conductivity can be dramatically improved.

To explain the method for adsorbing bromine, bromine gas or bromine water is used as the bromine source, and regarding the timing of adsorption, it may be absorbed into the raw material before producing the above composition, or it may be absorbed into the raw material before the composition is prepared. It may be adsorbed to the composition afterwards, or it may be adsorbed to a molded article formed into a desired shape. The preferred timing and target for adsorption is after molding. The adsorption method can be easily carried out by leaving the adsorbed material in a bromine gas atmosphere or bromine water, regardless of the raw material, composition, or molded product.

The conductivity of the bromine-containing composition obtained as described above is approximately 102 to 1030 cm before Bromine Dummy, whereas the conductivity is significantly improved to approximately 10 to 10 Ω.

Therefore, the conductive pps of the present invention can be supplied at low cost and is very useful as, for example, resistance heating elements, antistatic materials, high-voltage cable coating materials, shielding materials, electrode materials, electronic device materials, etc.

Next, the present invention will be specifically explained with reference to Examples.

Note that the text in the middle or ``chi'' is based on weight.

Example 1 100 parts by weight of commercially available pps powder, 30 parts of conductive carbon black, and 5 parts of dividing agent were mixed in a Henschel mixer to 30 parts by weight.
After mixing for a second, the mixture was extruded using an extruder at 300°C to form pellets. The composition was prepared in the form of a plate.100 parts of the pelletized composition of the present invention of Example 1 was prepared in a bromine gas atmosphere to a weight of 101 parts.
After degassing a small amount of bromine adhering to the surface, a molded product was obtained in the same manner as in Example 1, and its volume resistivity was i x io2Ωa.

Example 3 Too much of the conductive carbon black of Example 1 was mixed in 100 parts of 100% bromine water for 20 hours, washed with water and dried to obtain a bromine-adsorbing conductive carbon black. The bromine-containing conductive carbon A molded product obtained in the same manner as in Example 1 except that 100 parts of black was used in place of 30 parts of the conductive carbon black of Example 1 had a volume resistivity of 2 x 10''ΩG.

Example 4 The molded product obtained in Example 1 was left in bromine gas for about 10 hours and then degassed, and the volume resistivity was 3 x 10'.
It was Ω bacteria.

Patent applicant: Dainichiseika Industrial Co., Ltd.

Claims (2)

[Claims] (1) Conductive polyphenylene sulfide resin composition consisting of polyphenylene sulfide resin and conductive carbon black (2) The conductive resin composition according to claim 1, further containing adsorbed bromine.