The extrusion expansion rate of recycled rubber refers to the ratio of the size of the rubber after it has been extruded and expanded to the size of the pressed out type. When using reclaimed rubber to produce rubber products, the large extrusion expansion rate may lead to inaccurate size of semi-finished products, unsmooth surface, reduced production efficiency, and even scorching and other problems. There are many factors affecting the extrusion expansion rate of reclaimed rubber, among which carbon black, as a commonly used reinforcing agent in the rubber industry, has a significant impact on the extrusion expansion rate of reclaimed rubber.
In actual production, the amount and structure of carbon black will directly affect the extrusion expansion rate of reclaimed rubber. The influence of carbon black on the extrusion expansion rate of rubber compounds in different varieties of recycled rubber is also different.
1. Effect of carbon black dosage and structure on the extrusion expansion rate of reclaimed rubber
In the production of rubber products with reclaimed rubber, the addition of carbon black can reduce the glue content of the rubber compound, reduce the elastic deformation of the rubber compound, and thus reduce the extrusion expansion rate. Appropriately increasing the amount of carbon black can significantly reduce the extrusion expansion rate of rubber E4LYY626. When carbon black is used for reinforcement, the carbon black with high structure can reduce the expansion rate due to its high porosity of aggregates, which reduces the volume fraction of free rubber in the system, so the carbon black with high structure can reduce the expansion rate.
In the case of the same structural degree, the carbon black with small particle size and high activity has a greater impact than the carbon black with low activity.
There is an equivalent relationship among the structure and dosage of carbon black and the extrusion expansion rate of reclaimed rubber, that is, the reduction of the expansion rate of low structure and multi-dosage is equivalent to the reduction of the expansion rate of high structure and low dosage. In actual production, by adjusting the structure and dosage of carbon black, the processing performance of reclaimed rubber can be optimized while ensuring performance.
2. Effect of carbon black on the extrusion expansion rate of different varieties of recycled rubber products
Carbon black has different effects on the extrusion expansion rate of rubber in different varieties of rubber. For example, when 50 parts and 100 parts of carbon black are filled in natural rubber, the expansion rate is reduced by 1/2 and 9/10, respectively, and in styrene-butadiene rubber, it is reduced by 1/3 and 3/4, respectively. As a low-cost rubber raw material, reclaimed rubber is used in combination with raw rubber to produce rubber products most of the time. When designing the formulation, the characteristics of the rubber variety need to be fully considered.
In actual production, the influence of carbon black on the extrusion expansion rate of reclaimed rubber is multifaceted, including the structure, particle size and dosage of carbon black. Selecting the appropriate carbon black variety and adjusting its dosage can effectively reduce the extrusion expansion rate of reclaimed rubber and improve its processing performance and application performance.
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