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Gelating agent for alkaline cell and alkaline cell

A gelling agent, alkaline battery technology, applied in the direction of alkaline battery electrodes, electrolyte immobilization/gelation, battery electrodes, etc., can solve problems such as insufficient satisfaction

Inactive Publication Date: 2002-03-13
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these gelling agents are not yet sufficiently satisfactory in terms of preventing zinc powder sedimentation, battery leakage, liquid squeezing of the gelling agent, and battery production efficiency.

Method used

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  • Gelating agent for alkaline cell and alkaline cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] In a 2-liter beaker, 200 g of acrylic acid, 0.6 g of (0.3% / acrylic acid pentaerythritol triallyl ether (manufactured by Daiso), and 800 g of ion-exchanged water were added, and cooled to 8°C.

[0173] Put the acrylic acid aqueous solution into a 1.5-liter heat-insulated polymerization tank, pass nitrogen into the aqueous solution, make the dissolved oxygen in the aqueous solution reach below 0.1PPm, add 4.0g0.1% hydrogen peroxide and 4.0g0.1%L -Aqueous solution of ascorbic acid and 10% aqueous solution of 1.0 g of 2,2'-azobis(2-amidinopropane)hydrochloride (manufactured by Wako Pure Chemical Industry Co., Ltd., trade name: V-50), continue to purify the nitrogen in the aqueous solution until until aggregation begins. The polymerization started, and since the viscosity of the acrylic acid aqueous solution started to rise, the nitrogen purge was stopped, and the polymerization was carried out for 6 hours. The temperature of the aqueous acrylic acid solution was measured w...

Embodiment 2

[0181] According to Example 1, except that the addition amount of pentaerythritol triallyl ether is taken as 0.2g (0.1% / acrylic acid), other operations are carried out in the same way as Example 1 to obtain the gelling agent (2) of the present invention.

Embodiment 3

[0183] To 100 g of the powder of the gelling agent (2) of the present invention obtained in Example 2, 0.1 g of ethylene glycol diglycidyl ether (manufactured by Nagase Chemicals Co., Ltd., trade name: Dynakolu) was added. (デナコ-ル) 810) mixed solution formed with 7.9g methanol and 2.0g ion-exchanged water, fully mixed, put the mixed powder into a circulating air drying mechanism at 130°C, and heat for 30 minutes to perform gelation. The surface cross-linking to obtain the gelling agent (3) of the present invention.

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Abstract

A gelating agent for an alkaline cell is a cross-linked polymer (A) comprising (meth)acrylic acid and / or its alkali metal salt as a main constituent monomer unit and obtained by an aqueous solution polymerization or a reversed phase suspension polymerization and satisfies the following required conditions (1), (2). The gelating agent has good draining property, satisfactorily high speed charging property of the alkaline electrolytic solution and is therefore effective to produce cells with little unevenness of the charging amount of the electrolytic solution and having uniform quality by mass production and an alkaline cell using the gelating agent is provided with durable discharge time and remarkably excellent impact resistance for a long duration. The said required conditions are required condition (1); that the gelating agent contains 50 % by weight or more of a particle whose swollen particle size becomes 300 to 4,000 mu m when the gelating agent is swollen in an aqueous potassium hydroxide solution of 40 % by weight concentration and required condition (2); that the aqueous potassium hydroxide solution of 40 % by weight concentration containing 3 % by weight of the gelating agent has 0 to 20 mm stringiness.

Description

technical field [0001] The present invention relates to a gelling agent for alkaline batteries and alkaline batteries. In more detail, it relates to a gelling agent for a negative electrode alkaline battery in a gel form using a gelling agent for an alkaline battery negative electrode mainly including an alkaline electrolyte solution and zinc powder, and an alkaline battery using the gelling agent. technical background [0002] For many years, the cathode of alkaline batteries has mainly used a mixture of high-concentration alkaline electrolyte (high-concentration potassium hydroxide aqueous solution, containing zinc oxide, etc.) and zinc powder and / or zinc alloy powder, in order to prevent alkaline Zinc powder and the like in the electrolytic solution settle, and it is proposed to use a water-absorbing resin or the like having large particles in which poly(meth)acrylic acid and its salts are insolubilized by a crosslinking agent as a gelling agent. (1. Japanese Patent Publ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/06C09K3/00H01M4/02H01M4/24H01M4/62H01M6/06H01M6/08H01M6/22
CPCY02E60/124H01M4/622H01M6/06H01M2300/0014Y02E60/12H01M6/08H01M2300/0085H01M4/621H01M6/22H01M4/02
Inventor 住谷隆小池正美钱谷幸雄
Owner SANYO CHEM IND LTD
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