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Production method of carboxymethyl lignin used as additive for negative electrode of lead-acid storage battery

A technology for lead-acid batteries and production methods, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of high apparent density, poor workmanship, and high import prices, achieve high lignin purity, improve product quality, and reduce cost effect

Inactive Publication Date: 2014-05-07
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

Due to the poor processability of the domestic sodium lignosulfonate paste, the resulting paste is thin and has a large apparent density, and the imported lignosulfonate is usually used, but the price of imported goods is high. Therefore, in recent years, very few scholars have tried The carboxymethylated lignin is used as lead-acid accumulator negative electrode additive, how to make water-soluble carboxymethyl lignin is rarely seen in the report, the method of extracting lignin from the papermaking black liquor of alkaline pulping announced by CN1221709, so The water solubility of lignin is not ideal

Method used

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Embodiment Construction

[0015] The present invention is described in further detail below in conjunction with embodiment: this is used as the carboxymethyl lignin production method of lead-acid storage battery negative electrode additive and carries out as follows:

[0016] (1) Prepare materials: choose and buy the National Wood Resources Comprehensive Utilization Engineering Technology Center of Zhejiang Agriculture and Forestry University. According to the method announced by the patent No. 201110113503.6, the lignin obtained is used as the raw material for the production of this carboxymethyl lignin, and the remaining ethanol and isopropanol , methanol, NaOH, chloroacetic acid, bromoacetic acid, and hydrochloric acid are commercially available and require industrial purity;

[0017] (2) Dissolving lignin: add 1 part by weight of lignin and 10 parts by weight of hydrous ethanol with a volume ratio of 85%-95%, or 10 parts by weight of isopropanol or methanol in the reaction kettle, stir for 10-20 min...

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Abstract

The invention relates to a production method of carboxymethyl lignin used as an additive for the negative electrode of a lead-acid storage battery. The production method comprises the following steps: firstly, preparing materials; secondly, dissolving lignin; thirdly, alkalizing lignin; fourthly, etherifying the alkalized lignin; and fifthly, forming the carboxymethyl lignin. According to the carboxymethyl lignin prepared by the method, as the carboxyl content of lignin produced by grass families is high, carboxymethyl content is high after carboxymethylation and the water solubility is good; the purity of lignin extracted by organic solvent is high, lignin is dissolved in an organic solvent used as a reaction medium and can be subjected to homogeneous reaction, the reaction is complete and uniform, the degree of substitution of the carboxymethyl is improved, the solvent can be recycled and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for producing carboxymethyl lignin (CML) used as a lead-acid battery negative electrode additive by taking lignin extracted by an organic solvent as a raw material. Background technique [0002] As we all know, lignin is difficult to dissolve in water. However, lignin soluble in water is an important raw material for negative electrode additives of lead-acid batteries. Therefore, it is necessary to modify lignin. The most commonly used important additive for the negative electrode of the battery, it not only has special significance for the cold start ability and cycle life of the battery, but also has a very important impact on the overall performance of the negative plate. The most obvious effect of lignosulfonate on battery performance is to improve low-temperature performance during high-rate discharge. Lignosulfonate is tightly adsorbed on the surface of the active material to form a fine and porous crystal struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00H01M4/62
CPCY02E60/10
Inventor 金贞福童再康文桂峰
Owner ZHEJIANG FORESTRY UNIVERSITY
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