JPS5991135A - Electrically conductive plastic material - Google Patents

Abstract

PURPOSE:To provide the titled material having high mechanical strength and excellent electrical conductivity even though no metal is blended, by blending graphite and electrically conductive carbon black with a plastic material in a specified ratio. CONSTITUTION:30-80wt% plastic material such as olefin resin, phenolic resin or rubber, 5-65wt% graphite and 5-40wt% electrically conductive carbon black are blended together. Graphite treated with a dopant, such as bromine, iodine bromide or nitric acid, is preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic conductive material that has a certain level of electrical conductivity without containing metal in its components.

In recent years, the field of use of plastic conductive materials in home appliances, computers, and other components has been significantly expanding.

General plastic conductive materials include those used as so-called plastic moldings, as well as synthetic resin paints, and are very commonly made by dispersing fine metal powders of silver, copper, and aluminum into plastic. In addition to those with fine particles dispersed in them, there are also those in which fine powder such as carbon is dispersed. However, since these materials simply disperse the conductive material as described above, if the dispersion state cannot be maintained uniformly, not only will the conductivity fluctuate, but there is also a limit to the conductivity itself. be. For example, some conductive paints containing dispersed metal powder that exhibit a conductivity of 104 to 10 SΩ-1'cIn'' are known, but this naturally limits the range of use as a conductive material. Ta.

Recently, there have been reports of attempts to obtain conductive materials by acting various dopants on polyacetylene, pyripyrrole, polyparaphenylene sulfide, etc., but the devices are complicated and the characteristics Many problems remain, including instability.

The present inventors have finally arrived at the present invention as a result of various studies in order to obtain a plastic conductive material having as high conductivity and mechanical strength as possible within the range of conventionally used materials.

That is, the present invention uses plastic material (hereinafter referred to as human component), graphite (hereinafter referred to as component B), and conductive carbon black (hereinafter referred to as C component) as the main essential components of the conductive material.
It is characterized by containing 30 to 80% by weight of component A, 5 to 65% by weight of component B, and 5 to 40% by weight of component C based on the total amount of essential components. It relates to plastic conductive materials.

The plastic materials targeted by the present invention include thermosetting resins substituted with phenol, elia, melamine, epoxy, alkyd, etc., polyolefins, polystyrene,
Thermoplastic resins consisting of groups such as PMMA, polyvinyl acetate, PVA, polyvinyl chloride, nylon, synthetic resin paints containing these synthetic resins, 8BR, butadiene rubber, imprene rubber, EP rubber, NBR, urethane rubber, silicone Including synthetic rubber such as rubber and various synthetic fibers.

Graphite may be used as it is, but if it is doped, the conductivity of the plastic conductive material can be further increased.

Dopants used for this purpose include bromine, iodine, -iodine chloride, -iodine bromide, sulfuric acid, nitric acid, arsenic (V) heptadide, and the like.

When mixing and kneading the above-mentioned plastic material (A) and graphite (B) with conductive carbon black (C), the mixture is kneaded using a known mixer or roll kneader, and then molded into a desired shape using a known molding machine. do.

The mixing ratio of A, B and C is 30% of the total amount.
-80% by weight, 5-65% by weight of B, 5-40% by weight of C, preferably 30-70% by weight of A, 15-65% by weight of B.
! #, %, C5-355-35 weight Preferably A45-65 weight%, B15-50 weight%, C5-35 respectively
Weight%. If the amount of component A is less than the above range, the mechanical strength and flexibility of the plastic or conductive material will decrease, and if it is too much, sufficient electrical conductivity will not be obtained.

By making a plastic conductive material with the above-mentioned structure, its conductivity can be greatly improved, and the mechanical strength of the plastic conductive material does not decrease much and the moldability is excellent, using only conventional equipment. The present invention will be explained in detail below using Examples and Comparative Examples, which are extremely advantageous in that they can be manufactured.

Example 1 The following materials were kneaded for 15 minutes using a pressure kneader at 160°C, and then formed into one sheet using a calendar roll.

Polyethylene (product name 5 [1008F, Mitsui Petrochemical!
III) 60 parts graphite (trade name 200", 200 pieces 5. Passage material,
(manufactured by Tokai Carbon) 30 parts carbon black (product name C0NDUCTEX-975.

Colombian carbon 10 parts example
2 The procedure of Example 1 was repeated using the following materials.

Polypropylene (product name M8230. Manufactured by Tokuyama Soda) 6
5 parts graphite (200'') 30 parts carbon black (trade name Natsuchen Black EC, manufactured by Lion Axie) 5 parts Example 3 The procedure of Example 1 was repeated using the following materials.

Ethylene propylene copolymer (product name: MS660゜manufactured by Tokuyama Soda) 55 parts graphite (200 ##) 30 parts carbon black (product name: VULCAN XC-72.

CABOT@ ) 15 parts Example 4 The procedure of Example 1 was repeated using the following materials.

Polyethylene (product name);'XO8<So, Showa Denko@
) 50 parts Graphite (200) 45 parts Carbon black (Ketjenblack EC) 5 parts Example 5 First, the following synthetic resin paint was placed on three rolls, and the graphite and carbon black were gradually added and kneaded to form a conductive paint. Obtained.

Phenol-modified oil-based varnish (product name "120B").

(manufactured by Union Kasei) 55 parts Graphite (200*) 35 parts Carbon black C Ketjen black EC) 10 parts Comparative example 1 The operation of Example 1 was repeated using the following materials.

Poly xq-ray> (5000SF) 50
M Graphite (200'') 50 parts Comparative Example 2 The procedure of Example 5 was repeated using the following materials.

Phenol modified oil varnish ('120B) ISO part graphite (200) 40 parts comparative example
3 The procedure of Example 1 was repeated using the following materials.

Polypropylene (MS250) 90 parts Carpump 5 y j (VULCAN XC-72) 10
m Example 6 A pressure kneader consisting of a ceramic mixing tank was set at 150°C, and 60 parts of polyethylene (product name 86008, manufactured by Showa Denko) and 10 parts of carbon black (Ketjen Black EC) were added thereto and heated for 10 minutes. Graphite powder (+200) 3 which was kneaded and then subjected to doping treatment
After kneading 0 parts for tML 2 minutes, a sheet 1111 was prepared by calendering.

The doping treatment conditions consisted of using a bromine solution as a dopant, immersing the graphite powder in it for about 20 hours, taking it out from the bromine solution, and leaving it in a fume hood at room temperature for 4 to 5 hours to remove excess bromine. ing.

Example 7 Add 20% graphite (200) to a solution of 0 atoms
40 parts of doped graphite obtained by soaking for 4 to 5 hours, polyethylene (
5000F) and 10 parts of carbon black (Ketjenblack EC) were kneaded for 15 minutes using the apparatus of Example 6, and then a sheet of III was prepared.

Example 8 Graphite (200") was immersed in a 3rn% methanol solution of iodine monochloride as a dopant for 20 hours for doping treatment. The graphite was then taken out and left in a fume hood for 4 to 5 hours.

20 parts of this doped graphite, 50 parts of polypropylene (MS230) and carb>F9'/
l (VULCANXC-72) 30
First, polypropylene and carbon black were kneaded for 10 minutes in a pressure kneader at 150°C, and then graphite was added and kneaded for 2 minutes. After that, one basket of sheets was created in the same manner as in the previous example.

Example 9 Graphite (200*) was immersed in methane monobromide at 50° C. for 20 hours for doping treatment, and then the graphite was taken out and left to dry in a fume hood for 4 to 5 hours.

50 parts of ethylene-propylene copolymer (trade name M8640, manufactured by Tokuyama Soda) and Carpump 9y (C0N)
After kneading 30 parts of DUCTEX-975) in a pressure kneader at 1'50°C for 10 minutes, 20 parts of the doped graphite was added and kneaded for another 2 minutes, and then one sheet was obtained. Ta.

Example 10 Graphai) (200 ##) was immersed in sulfuric acid for 20 hours and then left in a draft for 4 to 5 hours to dry.

After mixing 60 parts of polyethylene (FXO860), 10 parts of carbon black (Ketjenblack EC), and 30 parts of the above-mentioned doped graphite in a pressurized kneader at 150°C for 15 minutes, one fin was formed by a sheeting process. A sheet was created.

Example 11 Graphite (200) was immersed in a glass solution for 20 hours to perform doping treatment, and then dried in a fume hood.

Add 50 parts of synthetic resin paint (120B) to 3 rolls and gradually add carbon black (C Ketjenblack EC).
Example 12 Graphite (200) powder was taken into a stainless steel container, evacuated, and arsenic (V) heptadide was mixed with 25 parts of doped graphite. 250vrm
Doping treatment was carried out by introducing the pressure until it reached H& and maintaining this pressure for 5 days.

Meanwhile, 30 parts of polypropylene (MS230) and 5 parts of carbon black (Ketjenblack EC) were mixed in a pressure kneader heated to 150°C for 10 minutes, and then 65 parts of doped Gra7ite was added and kneaded for 2 minutes. Then, one basket of sheets was made.

Example 13 The properties of the products obtained in Examples 1 to 12 and Comparative Examples 1 to 3 were measured, and the results shown in the following table were obtained.

As clearly seen from the results in the above table, the conductive behavior of the plastic conductive material obtained according to the present invention is improved by using both graphite and carbon black, even though the amounts mixed in the plastic material do not change. The mechanical behavior is also comparable to that of conventional products.

The carbon black used in the Examples and Comparative Examples has the following physical properties.

Sanro Kimura, Leprosy Bentenshi

Claims (1)

[Scope of Claims] (1) Contains a plastic material, graphite and conductive carbon black as main essential components of the conductive material,
30 to 80% of plastic material based on the total amount of essential ingredients
A plastic conductive material characterized by blending graphite in a ratio of 5 to 65% by weight and conductive carbon plastic in a ratio of 5 to 40% by weight.
2) The plastic conductive material according to claim 1, wherein a plastic material selected from polypropylene, polyethylene, ethylene-propylene copolymer, etc., an olefin polymer, or a polyester resin paint is used. (3) A plastic conductive material according to claim 1, which uses graphite treated with a dopant. (4) Bromine, iodine, bromine chloride, iodine bromide, sulfuric acid,
At least one selected from the group of nitric acid and arsenic (V) fluoride
4. A plastic conductive material according to claim 3, wherein a species is used as a dopant.