High-strength flame-retardant alkali battery PP sealing ring and preparation method therefor

Abstract

The invention discloses a high-strength flame-retardant alkali battery PP sealing ring. The sealing ring comprises the following raw materials in parts by weight: 100 parts of polypropylene, 5-15 parts of maleic anhydride grafted ethylene propylene diene monomer, 3-8 parts of ethylene-vinyl acetate copolymer with 5-25% of vinyl acetate, 3-8 parts of SEBS thermoplastic elastomer, 2-6 parts of flameretardant additive, 4-10 parts of irregular glass fibers, and 0.5-2 parts of 1, 1-ethylidene diacetate. The alkali battery sealing ring provided by the invention has excellent electrical insulativityand corrosion resistance, high arc resistance, excellent high-and-low temperature resistance, relatively high mechanical strength, relatively high flame retardancy and water absorption and low gas transmittance, and the electrical performance is less affected by humidity, stable temperature and frequency; and in addition, the raw material combination is high in fluidity in the sealing ring forming and processing, so that generation of unqualified products caused by the phenomena of insufficient injection, insufficient filling and the like in the production process of the sealing ring can beavoided effectively, so that the sealing ring is a polypropylene sealing ring with excellent comprehensive performance and used for the alkali battery.

Description

technical field [0001] The invention relates to the technical field of alkaline battery components, in particular to a high-strength flame-retardant alkaline battery PP sealing ring and a preparation method thereof. Background technique [0002] Alkaline storage battery has been paid more and more attention by people because of its high capacity ratio and long life. The internal resistance of the battery is low and the current generated is large. Power tools and other fields have been widely used. The structure of alkaline battery is mainly composed of positive electrode, negative electrode, electrolyte, diaphragm and sealing ring. The battery sealing ring is one of the key parts of the battery. It not only plays the role of isolating the positive and negative electrodes of the battery, but also determines whether the battery is leaking or not. Liquid, so its structural design is becoming more and more complex, and the quality requirements are constantly improving. [0003...

AI Technical Summary

Problems solved by technology

[0003] Alkaline battery sealing rings in the prior art generally use polypropylene (PP) or nylon 66 (PA66), among which nylon 66 has relatively high hygroscopicity, and on this basis, it will affect the mechanical and electrical properties. The medium size change rate is relatively large, and the hygroscopic swelling will affect its electrical insulation under the condition of a certain pressure inside the alkaline battery; the sealing ring made of polypropylene has excellent electrical insulation and corrosion resistance, and its electrical properties are affected by humidity, Stable temperature and frequency are less affected, and arc resistance is good. It is an excellent base material for alkaline battery sealing rings. However, its poor low temperature resistance, flammability and low mechanical strength affect its use in alkaline batteries to a certain extent. Applications in the field of sealing rings