Natural rubber is widely used in the production of various rubber products such as tires, tapes, hoses, wires and cables, and has a wide range of applications. When using natural rubber to produce thicker rubber products, due to the poor thermal conductivity of the rubber itself, uneven vulcanization is prone to occur during vulcanization. In actual production, metal powder is an ideal heat conductor. Compared with silver powder, the price of aluminum powder is much lower, and it will not oxidize natural rubber like copper powder. Therefore, in the production of natural rubber products, aluminum powder can be added to improve the thermal conductivity of the rubber. Sex.
1. The necessity of adding aluminum powder to natural rubber
When natural rubber produces thick products such as rubber fenders, solid tires, tire treads, and rubber roller outer layers, the rubber itself has poor thermal conductivity, which leads to differences in the degree of vulcanization 2YLYY312 of each part after the entire material reaches the optimal vulcanization time. Vulcanized rubber cannot be vulcanized uniformly. In order to fully vulcanize thick natural rubber products, the method of increasing the vulcanization time is usually adopted (vulcanization at a temperature of 150°C, the vulcanization time increases by 5 minutes for every 6mm thickening of the product). This method will easily lead to thick products that are in direct contact with the mold. The surface is too sulphur.
Adding aluminum powder to natural rubber can strengthen the heat conduction during the vulcanization process, and then promote the uniform vulcanization of thick products.
2. Aluminum powder affects the properties of thick natural rubber products
When aluminum powder is used to fill natural rubber, as the amount of aluminum powder increases, the hardness of natural rubber vulcanizate rises to a certain value and then decreases, and the heat generation decreases; when the amount of aluminum powder is about 40 parts, the hardness of natural rubber vulcanizate will reach A peak value; the elongation at break of the vulcanizate increases with the increase of the amount of aluminum powder, the resilience is better, the tensile strength is relatively reduced, and the compression set is reduced. Due to the small reinforcing effect of aluminum powder, it is usually used in combination with other reinforcing fillers.
When natural rubber is filled with aluminum powder, high wear-resistant carbon black and white carbon black can be used in the reinforcing filling system, and acetylene carbon black can be used in conductive products. The optimal filling ratio of aluminum powder can be determined through experiments. In actual production, the natural rubber filled with aluminum powder has excellent thermal conductivity, which can significantly shorten the vulcanization time of vulcanized thick products and promote uniform vulcanization of the rubber. The addition of aluminum powder will also improve the heat resistance of natural rubber vulcanizates.
In actual production, in order to reduce production costs, many natural rubber product manufacturers will add a certain proportion of natural latex reclaimed rubber to the formula. While reducing costs, it can improve the fluidity and plasticity of the rubber, further promote the uniform vulcanization of the vulcanized rubber, and effectively reduce Vulcanization reaction; later editor will have the opportunity to continue to discuss with you the specific application of natural rubber/latex reclaimed rubber filled with aluminum powder.
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