A kind of lead-acid battery pole sealant and preparation method thereof

Abstract

The invention discloses a lead-acid battery pole post sealant formula and a preparation method thereof. The lead-acid battery pole post sealant formula includes the following components, and the mass percentage of each component is: 40% to 65% of bisphenol A epoxy resin , hydrophobic silica 10% to 20%, calcium oxide powder 3% to 8%, compound curing agent 20% to 35%; compound curing agent is the composition of dicyandiamide and low molecular weight polyamide A combination of amine and m-xylylenediamine. The epoxy resin is mixed with hydrophobic silica and calcium oxide powder to form a composite sealant. The hydrophobic silica improves the hydrophobicity of the epoxy resin and acts as an acid barrier; the calcium oxide powder can neutralize and block the acid further. Corrosive epoxy resin, and at the same time, the two fillers also effectively improve the toughness and temperature resistance of the sealant; realize the valve-controlled sealing of the battery, reduce or eliminate the harm caused by it, and improve the battery in harsh working environments. uniformity and reliability.

Description

technical field [0001] The invention relates to a lead-acid storage battery post sealant and a preparation method thereof. Background technique [0002] Lead-acid batteries have been widely used in industrial production and people's daily life, and have greatly promoted the development of the national economy. In the battery structure of traditional lead-acid batteries, epoxy resin is commonly used to seal the positive and negative poles. It is common to see leakage or penetration of sulfuric acid electrolyte at the junction between the pole and the epoxy sealant, especially when the battery is in the It is more serious when used for a long time or improperly used. If the battery is short of water or slightly thermally runaway, the battery is overcharged. At this time, a large amount of oxygen is generated on the surface of the positive pole. Due to the limited rate of oxygen recombination, the internal pressure and temperature of the battery increase. The joints between t...

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Problems solved by technology

Since the copper pole piece needs to be welded after the construction of the epoxy resin sealing primer, it is easy to loosen and crack due to the heat of the sealant during the welding process, which will aggravate the corrosion of the lead alloy pole and cause the possibility of leakage of the sulfuric acid electrolyte ;Once acid leakage occurs in the battery pole, the harm produced is very serious: (1) the sealing performance of the battery is reduced, and maintenance-free cannot be realized; (2) due to the leakage of acid, each unit of the battery The inhomogeneity of the total amount of acid solution added to the cell will lead to the phenomenon of uneven battery cell and single lagging phenomenon during the use of the battery; (3) the sulfuric acid electrolyte has a high concentration and is highly corrosive, which is harmful to people and clothing during use. damage or injury