JPS609060A - Carbon black for battery - Google Patents

Abstract

PURPOSE:To obtain a dry cell having long discharge continuation time by making to contain carbon powder within a specific range respectively of pH, a specific surface area and an iodine adsorption amount, in which a mixture of an organic polymer substance and/or a bituminous substance and a carbon black is thermally treated. CONSTITUTION:A substance, which contains carbon black obtainable by thermally treating a mixture of an organic polymer substance and/or a bituminous substance with carbon black and exceeding pH9 while having a specific area 40- 70m<2>/g and an iodine adsorption amount 50-80mg/g, is used. For instance, vinyl chloride resin 30wt%, acetylene black 100wt% and water 180wt% are granulated by a mixing granulator for being dried. This is supplied into an N2 gas atmospheric furnace maintained at the temperature of 1,300 deg.C for being burnt for 1hr in order to obtain 109wt% of the thermal cracking carbon powder within said characteristic range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a black for batteries, and more specifically, carbon black for batteries (hereinafter referred to as battery black) that allows dry batteries with a long discharge duration (hereinafter referred to as discharge time) to be obtained. Regarding 0 Conventionally, acetylene black has been exclusively used as battery black, and it is not suitable for manufacturing dry batteries with high discharge performance. not present.

The present invention provides a new battery black that eliminates the drawbacks of conventional battery blacks.

That is, the battery black of the present invention is a heat-treated mixture of carbon black and an organic polymer material with carbon bonded in its molecules and/or a bituminous material (hereinafter referred to as a carbon source material), and has a pti of 9 or more and a specific area of 40. ~70m2/g and iodine adsorption amount 50-80++v/I! It is characterized by containing carbon powder (hereinafter referred to as pyrolytic carbon powder).

Hereinafter, the content of the present invention will be explained in detail.

The battery black of the present invention is made of pyrolytic carbon powder and has different properties from conventional battery blacks.

That is, carbon black PH of J Engineering 5K-1469
The pH of the slurry black measured by the measuring method is 9 or more, and the specific surface area expressed as the amount of nitrogen adsorption by Canter Soso (specific surface area measuring device manufactured by Canter Chrome) is 40 to 70.
m"/11, J, the adsorption amount of 1NO iodine water bath liquid measured by the method of measuring carbon black iodine adsorption amount of K-6221 is 50 to 80 k/1i2, and the PH is lower than that of conventional acetylene black. It has physical properties such as a large surface area, a small specific surface area, and a small amount of iodine adsorbed.If the physical property value is outside the above range, the effect of improving the discharge performance of the dry battery will be small, so it is not preferred.

An example of a method for producing this battery black is that it can be obtained by heat-treating a mixture of a specific carbon source material and raw material carbon black at a high temperature.

More specifically, specific examples of the carbon source material include vinyl chloride resin, acrylonitrile resin, styrene resin, polyethylene resin, and ethylene asphalt. In addition, any raw material carbon black may be used, but it is preferable to use the above-mentioned acetylene black or by-product black that has the ability to impart a certain degree of tetraelectricity.Q Ratio of carbon source material to carbon black is blended so that the carbon produced by thermal decomposition of the carbon ginseng substance after heat treatment is contained in the pyrolytic carbon powder in an amount of 1 to 60% by weight.
The reason for doing this is that if the weight is less than 1 -, the conductive performance is insufficient, and if the weight exceeds 600, the coarse particles will increase.

In addition, the heat treatment is performed at a temperature of 1000°C or higher, preferably 1000-1
At a temperature of 600℃ and under non-oxidizing gas such as nitrogen, hydrogen,
It is necessary to carry out the process in an atmosphere such as argon or helium. If the temperature during heat treatment is less than 1,000'0, the effect of imparting electrical conductivity will not be sufficient, and if it exceeds 1,600° C., depending on the type of raw material carpump sick, it will tend to graphitize, reducing the effect of imparting electrical conductivity.

In the specific use of the battery black of the present invention, "C" is first mixed with manganese dioxide and zinc oxide in a mixer such as a V-type mixer.

The blending ratio of battery black is preferably 5 to 30% in the mixture of manganese dioxide and black.

In a range other than the above, it is difficult to obtain a dry battery with a long discharge time.

Next, a dry battery composition obtained by adding an electrolytic solution consisting of an aqueous solution containing zinc chloride, ammonium chloride, and mercuric chloride to a mixture consisting of manganese dioxide, zinc oxide, and battery black was used as a UM-l type dry battery. When the battery is filled and molded for use and the discharge time of the dry battery is measured, it has an improvement effect of 0 to 50% compared to conventional batteries containing acetylene black.

As mentioned above, the battery black of the present invention is a new black with physical properties that are extremely different from conventional battery blacks, and therefore, the performance of dry batteries containing it in both continuous discharge and intermittent discharge is Therefore, it is possible to obtain a dry battery with a long life.

Next, the battery platform of the present invention will be explained in more detail with reference to Examples.

Examples and Comparative Examples Manufacture of battery grates Vinyl chloride resin (Denka Kagaku Kogyo ■Surface product name "Denka Vinyl 5B-110SJ") 30 parts by weight, acetylene black (Denki Kagaku Kogyo ■Surface product name "Denka Black J") 10 parts by weight
0 parts by weight and 180 parts by weight of water were granulated using a mixing granulator and dried. This was fed into a N2 gas atmosphere furnace maintained at a temperature of 1600°C and fired for 1 hour.
9 parts by weight were obtained. Its physical properties are shown in Table 1 along with the conventional product.

Production of dry batteries The pyrolytic carbon powder obtained by the above method was used as battery black, and this was combined with manganese dioxide (manganese dioxide manufactured by Mikata Kinzoku ■, electrolytic manganese dioxide), zinc oxide (manufactured by Ishizu Pharmaceutical ■, special grade reagent), and 70% water by weight. 28 parts by weight of zinc chloride (Special grade reagent manufactured by Ishizu Pharmaceutical ■), 2 parts by weight of ampanium chloride (Special grade reagent manufactured by Ishizu Pharmaceutical ■), 0.06 parts by weight of mercuric chloride (Special grade reagent manufactured by Ishizu Pharmaceutical ■) and an electrolytic solution consisting of the following were blended in the proportions shown in Table 2 and mixed in a beaker to produce a dry battery composition.

Next, this dry cell composition was filled into a dry cell mold and press-molded from above under a load of 40 to 44 kg to prepare a test dry cell.

Next, in order to measure the discharge time of the dry battery made as described above, a resistance of 4Ω was used, and in the case of continuous discharge, 0.8Ω was used.
The battery was discharged to 5 V, or 0.9 V in the case of intermittent discharge, and the discharge time at that time was measured. Additionally, open circuit voltage and short circuit current were measured. The measurement results are shown in Table 2.

For comparison, the discharge time of dry batteries manufactured in the same manner as in the example except that acetylene silicon shown in Table 2 (Denka Kagaku Kogyo Co., Ltd. reverse product name "Denka Black") was used as the battery black was measured. The results are also shown in Table 82.

Table 1 (Note 1) Physical properties of the battery black used in Examples and Comparative Examples were measured by the following method.

(1) Hydrochloric acid absorption amount: Measured in accordance with J Engineering 5x-1469. (Unit: ω15g) (2) PH: Measured in accordance with J Engineering 5K-1469.

(3) Specific surface area: Measured using Cantersoap (manufactured by Canterchrome).

(Unit: m2/11) (4) Amount of iodine adsorption: Measured in accordance with J Engineering 5K-6221. (Tny/9) Patent applicant Denki Kagaku Kogyo Co., Ltd.

Claims (1)

[Claims] pH obtained by heat-treating an organic polymer substance with carbon bonded in its molecule and a mixture of ω' or bituminous material and carbon black
9 or more, specific surface area 40-70m2/g and iodine adsorption amount 5
Carbon black for batteries containing 0 to 80 μ/g of carbon powder.