High-thermal-stability alkaline battery PA sealing ring and preparation method thereof

Abstract

The invention discloses a high-thermal-stability alkaline battery PA sealing ring and a preparation method thereof. The high-thermal-stability alkaline battery PA sealing ring is prepared from the following raw materials in parts by weight: 100 parts of nylon 66, 8 to 16 parts of poly(trimethylene terephthalate), 5 to 10 parts of polypropylene, 10 to 20 parts of compatilizer, 3 to 8 parts of SEBS thermoplastic elastomer, 2 to 6 parts of flame retardant additive and 0.5 to 2 parts of 1,1-ethylidene diacetate. The alkaline battery sealing ring disclosed by the invention has the advantages of electrical insulating property, corrosion resistance, oil resistance, arc resistance, good mechanical property, good gas barrier property and good fatigue durability. By means of blending modification among raw materials, water absorption, thermal stability and processability of the nylon sealing ring are effectively improved; furthermore, the raw material combination has good fluidity in sealing ring forming processing, so that rejected products caused by the phenomena of insufficient injection, insufficient fill and the like in a sealing ring production process are prevented from being generated; the alkaline battery nylon sealing ring has excellent comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of alkaline battery components, in particular to a highly thermally stable alkaline battery PA 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] Alka...

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 polypropylene has poor low temperature resistance, is flammable and has low mechanical strength, and its use rate is not as popular as that of nylon sealing rings.

Due to the presence of amide groups, nylon has good wear resistance, self-lubrication, oil resistance, mechanical properties, gas barrier properties and fatigue resistance. It is an excellent base material for alkaline battery seals, but nylon products The thermal stability is poor, its thermal degradation tendency is relatively serious, and it is accompanied by crystallization during molding, and the molding shrinkage is relatively large, which affects its application in the field of alkaline battery sealing rings to a certain extent