The battery plastic shell can be used to hold the discharge solution and the electrode plate assembly. At present, it is mostly made of hard rubber or polypropylene plastic, which requires high acid resistance, heat resistance, shock absorption, and insulation. In actual production, the battery shell can be made of natural rubber and synthetic rubber, or synthetic rubber can be used completely, such as butadiene rubber and styrene-butadiene rubber; a small amount of reclaimed tire rubber is mixed in the battery tank 2YLYY629 can effectively reduce the cost of raw materials.
1. Synthetic rubber/reclaimed rubber and use the reference formula for the production of battery shell
30 parts of butadiene rubber, 70 parts of oil-extended styrene-butadiene rubber, 10 parts of reclaimed tire rubber, 35 parts of sulfur, 2.5 parts of accelerator D, 1.2 parts of accelerator M, 7 parts of magnesium oxide, 2 parts of stearic acid, 2 parts of paraffin wax , 10 parts of pitch, 6 parts of solid coumarone, 140 parts of clay, 60 parts of calcium carbonate, 50 parts of barium sulfate, 5 parts of carbon black; total: 430.7 parts.
2. The specific role of different types of rubber raw materials in the battery shell
Synthetic rubber can give higher heat resistance and hardness to the battery glue tank. When the amount of sulfur is appropriate, the hard rubber containing styrene-butadiene rubber will produce less heat in the vulcanization reaction; the butadiene rubber vulcanized rubber has excellent wear resistance. A small amount of reclaimed tire rubber is used in the battery rubber shell formula with butadiene rubber and oil-extended styrene-butadiene rubber as the main raw materials, which can not only reduce part of the raw material cost, but also reduce the shrinkage of the rubber and reduce the vulcanization deformation; effective use Tire reclaimed rubber with higher rubber hydrocarbon content is more beneficial to the mechanical properties of the rubber shell.
3. The specific role of the compounding agent of the vulcanization system in the battery shell
Battery rubber shells are generally vulcanized with sulfur, and the appropriate amount of selenium can further improve the heat resistance and electrical insulation of the rubber. When the amount of sulfur is less than 40 parts, the heat generation of styrene-butadiene rubber hard rubber is lower than that of natural rubber hard rubber. The battery rubber shell can use organic accelerators and inorganic accelerators together to increase the sulfur reaction rate and shorten the vulcanization time; the combination of magnesium oxide and accelerator D is more commonly used, and the vulcanization effect and the quality of the vulcanized rubber are better. When the formula contains reclaimed rubber, an appropriate amount of thiazole accelerator can be used in combination to accelerate the vulcanization.
4. The specific role of other auxiliary system additives in the battery shell
Reinforcing agents are generally not used in the production of battery rubber shells. Reinforcing carbon black is only used as a coloring agent, and the amount is 5 parts. Reinforced filling system is more inclined to fill clay. When the heat resistance of the rubber material is high, it can be filled with calcium carbonate; when the battery rubber shell has requirements for acid and alkali resistance, it is recommended to fill a certain amount of barium sulfate. As the softening system, it is recommended to use asphalt and coumarone to increase the viscosity of the rubber; the appropriate amount of paraffin wax can further reduce the deformation of the battery glue tank.
In actual production, the actual performance requirements of the battery shell in different applications are different, and the amount of reclaimed tire rubber is also different. Some battery shells can even use reclaimed tire rubber. Later, the editor will continue to discuss related issues with you.
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